/*
 * ============================================================================
 *  INTERDOC — Landing Page Stylesheet
 *  Based on the Wissenswerk Design System
 * ============================================================================
 */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;600;700;800&display=swap');

/* ============================================================================
   1. CSS CUSTOM PROPERTIES (DESIGN TOKENS)
   ============================================================================ */

:root {
  --font-main: 'Inter', sans-serif;

  /* Neutrals (Dark Mode) */
  --neutral-950: #0a0a0a;
  --neutral-900: #111111;
  --neutral-850: #1a1a1a;
  --neutral-800: #222222;
  --neutral-700: #333333;
  --neutral-600: #444444;
  --neutral-500: #555555;
  --neutral-400: #666666;
  --neutral-300: #888888;
  --neutral-200: #aaaaaa;
  --neutral-100: #cccccc;
  --neutral-050: #ffffff;

  /* Brand Accent — Blue */
  --accent-color:       #4d7cfd;
  --accent-hover:       #7a9fff;
  --accent-active:      #3a69ea;
  --accent-glow:        rgba(77, 124, 253, 0.5);
  --accent-dim:         rgba(77, 124, 253, 0.10);
  --accent-border:      rgba(77, 124, 253, 0.30);

  /* Status Colors */
  --success-green:  #00cc66;
  --warning-yellow: #ffc800;
  --error-red:      #cc0000;
  --info-blue:      #2196f3;

  /* Semantic Backgrounds */
  --bg-primary:   var(--neutral-950);
  --bg-secondary: var(--neutral-900);
  --bg-tertiary:  var(--neutral-850);
  --bg-elevated:  var(--neutral-800);
  --bg-overlay:   rgba(0, 0, 0, 0.6);

  /* Semantic Text */
  --text-primary:   var(--neutral-050);
  --text-secondary: var(--neutral-100);
  --text-tertiary:  var(--neutral-200);
  --text-muted:     var(--neutral-300);
  --text-disabled:  var(--neutral-400);

  /* Semantic Borders */
  --border-primary: var(--neutral-700);
  --border-subtle:  var(--neutral-800);
  --border-hover:   var(--neutral-500);

  /* Transparencies */
  --white-02: rgba(255, 255, 255, 0.02);
  --white-05: rgba(255, 255, 255, 0.05);
  --white-10: rgba(255, 255, 255, 0.10);
  --black-20: rgba(0, 0, 0, 0.20);
  --black-30: rgba(0, 0, 0, 0.30);
  --black-50: rgba(0, 0, 0, 0.50);

  /* Spacing */
  --space-xs:   4px;
  --space-sm:   8px;
  --space-md:  16px;
  --space-lg:  24px;
  --space-xl:  40px;
  --space-2xl: 80px;
  --space-3xl: 120px;

  /* Border Radius */
  --radius-sm:   6px;
  --radius-md:   8px;
  --radius-lg:  12px;
  --radius-xl:  20px;
  --radius-pill: 9999px;

  /* Shadows */
  --shadow-sm:  0 2px 8px var(--black-20);
  --shadow-md:  0 4px 20px var(--black-30);
  --shadow-lg:  0 8px 40px var(--black-50);
  --shadow-glow: 0 0 30px var(--accent-glow);
  --shadow-card-hover: 0 0 15px rgba(77, 124, 253, 0.4);

  /* Transitions */
  --transition-fast:   all 0.15s ease;
  --transition-base:   all 0.3s ease;
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);

  /* Layout */
  --container-max: 1200px;

  /* Theme-aware hardcoded backgrounds */
  --header-bg:       rgba(10, 10, 10, 0.85);
  --header-bg-scroll: rgba(10, 10, 10, 0.95);
  --mobile-nav-bg:   rgba(10, 10, 10, 0.98);
  --dots-color:      rgba(255, 255, 255, 0.04);
}

/* ── Light Mode ── */
[data-theme="light"] {
  --neutral-950: #ffffff;
  --neutral-900: #f8f9fa;
  --neutral-850: #f0f1f3;
  --neutral-800: #e4e6e9;
  --neutral-700: #ced4da;
  --neutral-600: #adb5bd;
  --neutral-500: #6c757d;
  --neutral-400: #ced4da;
  --neutral-300: #6c757d;
  --neutral-200: #495057;
  --neutral-100: #343a40;
  --neutral-050: #111111;

  --accent-color:  #4d7cfd;
  --accent-hover:  #3a69ea;
  --accent-active: #2d56d6;
  --accent-glow:   rgba(77, 124, 253, 0.25);
  --accent-dim:    rgba(77, 124, 253, 0.06);
  --accent-border: rgba(77, 124, 253, 0.20);

  --bg-overlay: rgba(255, 255, 255, 0.85);

  --white-02: rgba(0, 0, 0, 0.02);
  --white-05: rgba(0, 0, 0, 0.04);
  --white-10: rgba(0, 0, 0, 0.07);
  --black-20: rgba(0, 0, 0, 0.06);
  --black-30: rgba(0, 0, 0, 0.08);
  --black-50: rgba(0, 0, 0, 0.12);

  --shadow-glow: 0 0 30px var(--accent-glow);
  --shadow-card-hover: 0 0 15px rgba(77, 124, 253, 0.2);

  --header-bg:       rgba(255, 255, 255, 0.85);
  --header-bg-scroll: rgba(255, 255, 255, 0.95);
  --mobile-nav-bg:   rgba(255, 255, 255, 0.98);
  --dots-color:      rgba(0, 0, 0, 0.12);
}

/* ============================================================================
   2. RESET & BASE
   ============================================================================ */

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-main);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition-base);
}

img, video {
  max-width: 100%;
  display: block;
}

ul, ol { list-style: none; }

::-webkit-scrollbar       { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--neutral-950); }
::-webkit-scrollbar-thumb { background: var(--neutral-700); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent-color); }

/* ============================================================================
   3. TYPOGRAPHY
   ============================================================================ */

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.heading-hero {
  font-size: clamp(3rem, 8vw, 5.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  background: linear-gradient(90deg, var(--neutral-050) 0%, var(--neutral-300) 100%);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.heading-section {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
}

.heading-accent {
  color: var(--accent-color);
}

.eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent-color);
  margin-bottom: var(--space-md);
}

.lead {
  font-size: 1.2rem;
  color: var(--text-muted);
  max-width: 600px;
  line-height: 1.7;
}

.label-sm {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
}

/* ============================================================================
   4. LAYOUT UTILITIES
   ============================================================================ */

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.section {
  padding: var(--space-3xl) 0;
}

.section-sm {
  padding: var(--space-2xl) 0;
}

.flex           { display: flex; }
.flex-center    { display: flex; align-items: center; justify-content: center; }
.flex-between   { display: flex; align-items: center; justify-content: space-between; }
.flex-col       { display: flex; flex-direction: column; }
.gap-sm         { gap: var(--space-sm); }
.gap-md         { gap: var(--space-md); }
.gap-lg         { gap: var(--space-lg); }
.gap-xl         { gap: var(--space-xl); }

.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-xl); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-xl); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-xl); }

.text-center { text-align: center; }
.text-left   { text-align: left; }

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

/* ============================================================================
   5. BUTTONS
   ============================================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 12px 24px;
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-main);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0;
  text-transform: none;
  cursor: pointer;
  transition: var(--transition-base);
  white-space: nowrap;
}

.btn-primary {
  background: #041120;
  color: #ffffff;
}
.btn-primary:hover {
  background: #0a2a4a;
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}
.btn-primary:active {
  background: #020b16;
  transform: translateY(0);
}

.btn-secondary {
  background: transparent;
  border: 1px solid var(--border-primary);
  color: var(--text-secondary);
}
.btn-secondary:hover {
  border-color: var(--accent-color);
  color: var(--accent-color);
}

/* Plain text link with animated arrow */
.btn-text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  transition: color 0.2s ease;
  text-decoration: none;
}
.btn-text-link:hover {
  color: var(--text-primary);
}
.btn-text-link-arrow {
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}
.btn-text-link:hover .btn-text-link-arrow {
  transform: translateX(5px);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--accent-color);
  color: var(--accent-color);
}
.btn-outline:hover {
  background: var(--accent-color);
  color: #ffffff;
  box-shadow: var(--shadow-glow);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1rem;
  border-radius: var(--radius-lg);
}

.btn-icon {
  padding: 10px;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
}

/* ============================================================================
   6. NAVIGATION / HEADER
   ============================================================================ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 20px 0;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: var(--header-bg);
  border-bottom: 1px solid var(--border-subtle);
  transition: var(--transition-base);
}

.site-header.scrolled {
  padding: 12px 0;
  background: var(--header-bg-scroll);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 1.4rem;
  font-weight: 700;
  color: #041120;
  text-transform: none;
  letter-spacing: 0;
}

.logo img {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav-links a {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-secondary);
}
.nav-links a:hover {
  color: var(--accent-color);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

/* Language switcher */
.lang-switcher {
  position: relative;
}

.lang-globe-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  border-radius: 6px;
  color: var(--text-muted);
  transition: color 0.15s, background 0.15s;
  line-height: 0;
}

.lang-globe-btn:hover {
  color: var(--text-primary);
  background: var(--surface-2);
}

.lang-globe-btn svg {
  display: block;
}

.lang-dropdown {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--surface-1);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 4px;
  min-width: 140px;
  box-shadow: 0 8px 28px rgba(0,0,0,0.14);
  z-index: 200;
}

.lang-switcher.open .lang-dropdown {
  display: block;
}

.lang-option {
  display: flex;
  align-items: center;
  width: 100%;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  text-align: left;
  transition: background 0.12s, color 0.12s;
}

.lang-option:hover {
  background: var(--surface-2);
  color: var(--text-primary);
}

.lang-option--active {
  color: var(--accent-color);
}

/* Mobile menu toggle */
.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.mobile-menu-toggle svg {
  width: 24px;
  height: 24px;
  color: var(--text-primary);
}

/* Mobile nav overlay */
.mobile-nav {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  z-index: 999;
  background: var(--mobile-nav-bg);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-xl);
}

.mobile-nav.active {
  display: flex;
}

.mobile-nav a {
  font-size: 1.2rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--text-secondary);
}

.mobile-nav a:hover {
  color: var(--accent-color);
}

.mobile-nav-close {
  position: absolute;
  top: 20px;
  right: 20px;
  background: none;
  border: none;
  cursor: pointer;
}

.mobile-nav-close svg {
  width: 28px;
  height: 28px;
  color: var(--text-primary);
}

/* ============================================================================
   7. HERO SECTION
   ============================================================================ */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: var(--space-3xl) 0 var(--space-2xl);
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  top: 40%;
  right: 20%;
  transform: translate(50%, -50%);
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(77, 124, 253, 0.06) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* ── Hero two-column layout ── */
.hero-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: var(--space-2xl);
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: clamp(1.96rem, 3.5vw, 3.15rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin-bottom: var(--space-lg);
  background: linear-gradient(90deg, var(--neutral-050) 0%, var(--neutral-200) 100%);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero .lead {
  margin: 0 0 var(--space-xl);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 6px 16px;
  background: var(--accent-dim);
  border: 1px solid var(--accent-border);
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-color);
  letter-spacing: 0.5px;
  text-transform: uppercase;
  margin-bottom: var(--space-lg);
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: var(--space-xl);
  flex-wrap: wrap;
}

.hero-actions .btn-lg {
  padding: 12px 26px;
  font-size: 0.9rem;
}

/* ── Hero Visual (right column) — looping showcase animation ── */
.hero-visual {
  position: relative;
  height: 560px;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
}

.hero-showcase {
  position: relative;
  width: 100%;
  max-width: 460px;
  height: 100%;
  user-select: none;
  -webkit-user-select: none;
  pointer-events: none;
}

/* ── Prompt panel (bordered, contains input + tools) ── */
.showcase-prompt {
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  background: #ffffff;
  border: none;
  border-radius: 14px;
  padding: 12px;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.035), 0 0 16px rgba(0, 0, 0, 0.07), 0 6px 24px rgba(0, 0, 0, 0.07), 0 -4px 12px rgba(0, 0, 0, 0.035), 4px 0 12px rgba(0, 0, 0, 0.028), -4px 0 12px rgba(0, 0, 0, 0.028);
  transition: top 0.55s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.55s cubic-bezier(0.22, 1, 0.36, 1);
}

.hero-showcase.state-sent .showcase-prompt,
.hero-showcase.state-thinking .showcase-prompt,
.hero-showcase.state-answered .showcase-prompt {
  top: calc(100% - 110px);
  transform: translateY(-100%);
}

.showcase-input-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.showcase-input {
  position: relative;
  flex: 1;
  min-height: 32px;
  padding: 6px 4px;
  font-size: 0.85rem;
  color: #1a2332;
  white-space: nowrap;
  overflow: hidden;
}

.showcase-input-placeholder {
  position: absolute;
  left: 4px;
  top: 50%;
  transform: translateY(-50%);
  color: rgba(30, 40, 60, 0.4);
  font-size: 0.85rem;
  transition: opacity 0.2s ease;
}

.hero-showcase.state-typing .showcase-input-placeholder {
  opacity: 0;
}

.showcase-input-text {
  display: inline-block;
  vertical-align: middle;
}

.showcase-caret {
  display: inline-block;
  width: 1.5px;
  height: 14px;
  background: var(--accent-color, #4D7CFD);
  vertical-align: middle;
  margin-left: 1px;
  opacity: 0;
}

.hero-showcase.state-typing .showcase-caret {
  opacity: 1;
  animation: showcase-caret-blink 1s steps(2) infinite;
}

@keyframes showcase-caret-blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

.showcase-submit {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  border: none;
  background: var(--accent-color, #4D7CFD);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: default;
  transition: transform 0.15s ease, box-shadow 0.15s ease, opacity 0.2s ease;
  opacity: 0.55;
}

.hero-showcase.state-typing .showcase-submit,
.hero-showcase.state-answered .showcase-submit {
  opacity: 1;
}

.showcase-submit.is-pressed {
  transform: scale(0.92);
  box-shadow: 0 0 0 4px rgba(77, 124, 253, 0.25);
}

.showcase-tools {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid rgba(0, 0, 0, 0.07);
}

.showcase-tool {
  width: 26px;
  height: 26px;
  border-radius: 6px;
  border: none;
  background: transparent;
  color: rgba(30, 40, 60, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: default;
}

/* ── Messages stack (above prompt) ── */
.showcase-messages {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 50%;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: bottom 0.55s cubic-bezier(0.22, 1, 0.36, 1);
}

.hero-showcase.state-sent .showcase-messages,
.hero-showcase.state-thinking .showcase-messages,
.hero-showcase.state-answered .showcase-messages {
  /* 110px (prompt bottom offset) + ~111px (prompt height) + 10px (gap) */
  bottom: 231px;
}

.showcase-msg {
  display: flex;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.showcase-msg-user {
  justify-content: flex-end;
}

.showcase-msg-bot {
  justify-content: flex-start;
}

.hero-showcase.state-sent .showcase-msg-user,
.hero-showcase.state-thinking .showcase-msg-user,
.hero-showcase.state-answered .showcase-msg-user {
  opacity: 1;
  transform: translateY(0);
}

.hero-showcase.state-thinking .showcase-msg-bot,
.hero-showcase.state-answered .showcase-msg-bot {
  opacity: 1;
  transform: translateY(0);
}

.showcase-bubble {
  max-width: 86%;
  padding: 10px 14px;
  border-radius: 14px;
  font-size: 0.82rem;
  line-height: 1.45;
}

.showcase-bubble-user {
  background: var(--accent-color, #4D7CFD);
  color: #ffffff;
  border-bottom-right-radius: 4px;
}

.showcase-bubble-bot {
  background: #f3f4f6;
  border: 1px solid var(--border-primary, rgba(0,0,0,0.07));
  color: var(--text-primary, #ffffff);
  border-bottom-left-radius: 4px;
  width: 100%;
  max-width: 100%;
}

/* Todo list inside bot bubble */
.showcase-todo {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.showcase-todo-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  color: var(--text-muted, rgba(255,255,255,0.45));
  transition: color 0.3s ease;
}

.showcase-todo-item.is-done {
  color: var(--text-secondary, rgba(255,255,255,0.7));
}

.showcase-todo-icon {
  position: relative;
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: currentColor;
}

.showcase-todo-spinner,
.showcase-todo-check {
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
  transition: opacity 0.25s ease;
}

.showcase-todo-item.is-loading .showcase-todo-spinner {
  opacity: 1;
  animation: showcase-spin 0.9s linear infinite;
  color: var(--accent-color, #4D7CFD);
}

.showcase-todo-item.is-done .showcase-todo-check {
  opacity: 1;
  color: var(--success-green, #22c55e);
}

@keyframes showcase-spin {
  to { transform: rotate(360deg); }
}

@keyframes showcase-skeleton-shimmer {
  0%   { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* Answer + sources (revealed after todos complete) */
.showcase-answer {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border-subtle, rgba(255,255,255,0.06));
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  transition: opacity 0.4s ease, max-height 0.4s ease;
}

.hero-showcase.state-answered .showcase-answer {
  opacity: 1;
  max-height: 200px;
}

.showcase-answer p {
  margin: 0 0 10px;
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--text-primary, #ffffff);
  transition: color 0.15s ease;
}

.showcase-answer.is-skeleton p {
  color: transparent;
  border-radius: 3px;
  background: linear-gradient(
    90deg,
    rgba(255,255,255,0.10) 25%,
    rgba(255,255,255,0.30) 50%,
    rgba(255,255,255,0.10) 75%
  );
  background-size: 400% 100%;
  animation: showcase-skeleton-shimmer 0.2s ease-in-out 1 forwards;
}

.showcase-answer.is-skeleton .showcase-sources {
  visibility: hidden;
}

.showcase-sources {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.showcase-source-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 9px;
  border-radius: 999px;
  background: var(--accent-dim, rgba(77, 124, 253, 0.12));
  border: 1px solid var(--accent-border, rgba(77, 124, 253, 0.28));
  color: var(--accent-color, #4D7CFD);
  font-size: 0.7rem;
  font-weight: 600;
  opacity: 0;
  transform: translateY(5px);
}

@keyframes showcase-pill-in {
  to { opacity: 1; transform: translateY(0); }
}

.showcase-source-pill.is-visible {
  animation: showcase-pill-in 250ms ease forwards;
}

/* ── Animated cursor ── */
.showcase-cursor {
  position: absolute;
  top: 0;
  left: 0;
  width: 20px;
  height: 20px;
  pointer-events: none;
  opacity: 0;
  transform: translate(420px, 380px);
  transition: transform 0.7s cubic-bezier(0.22, 1, 0.36, 1),
              opacity 0.3s ease;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.4));
  z-index: 5;
}

.showcase-cursor.is-visible {
  opacity: 1;
}

.showcase-cursor.is-clicking::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid var(--accent-color, #4D7CFD);
  animation: showcase-click-pulse 0.5s ease-out;
}

@keyframes showcase-click-pulse {
  0%   { transform: scale(0.4); opacity: 1; }
  100% { transform: scale(1.8); opacity: 0; }
}

/* Background dot pattern */
.bg-dots {
  background-image: radial-gradient(circle, var(--dots-color) 1px, transparent 1px);
  background-size: 32px 32px;
}

/* ============================================================================
   8. FEATURE CARDS
   ============================================================================ */

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
}

.feature-card {
  background: var(--white-02);
  border: 1px solid var(--white-10);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: var(--transition-smooth);
}

.feature-card:hover {
  transform: translateY(-8px);
  border-color: var(--accent-color);
  box-shadow: 0 0 20px var(--accent-dim);
}

.feature-icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-dim);
  border: 1px solid var(--accent-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-lg);
  color: var(--accent-color);
}

.feature-icon svg {
  width: 24px;
  height: 24px;
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent-color);
  margin-bottom: var(--space-sm);
}

.feature-card p {
  font-size: 0.95rem;
  color: var(--text-tertiary);
  line-height: 1.65;
}

/* ============================================================================
   9. HOW IT WORKS STEPS
   ============================================================================ */

.steps-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  max-width: 680px;
  margin: 0 auto;
}

.step-item {
  display: flex;
  gap: var(--space-lg);
  align-items: flex-start;
}

.step-number {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-color);
  color: #ffffff;
  font-size: 1.1rem;
  font-weight: 800;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-glow);
}

.step-item h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
  color: var(--text-primary);
}

.step-item p {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ============================================================================
   10. STATS STRIP
   ============================================================================ */

.stat-strip {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3xl);
  flex-wrap: wrap;
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.stat-item { text-align: center; }

.stat-value {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--accent-color);
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  margin-top: var(--space-xs);
}

/* ============================================================================
   11. TESTIMONIAL CARDS
   ============================================================================ */

.testimonial-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
}

.testimonial-quote {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  font-style: italic;
  margin-bottom: var(--space-lg);
}

.testimonial-quote::before {
  content: '\201C';
  color: var(--accent-color);
  font-size: 3rem;
  font-style: normal;
  line-height: 0;
  vertical-align: -0.6em;
  margin-right: 4px;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.testimonial-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-elevated);
  border: 2px solid var(--accent-border);
  overflow: hidden;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-weight: 700;
  font-size: 1rem;
}

.testimonial-name {
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--text-primary);
}

.testimonial-role {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ============================================================================
   12. INTEGRATIONS ROW
   ============================================================================ */

.integrations-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xl);
  flex-wrap: wrap;
}

.integration-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  opacity: 0.55;
  transition: var(--transition-base);
  cursor: default;
}

.integration-item:hover { opacity: 1; }

.integration-logo {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: var(--transition-base);
}

.integration-item:hover .integration-logo {
  color: var(--accent-color);
}

.integration-logo svg {
  width: 40px;
  height: 40px;
}

.integration-name {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
}

/* ============================================================================
   13. PRICING CARDS
   ============================================================================ */

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-xl);
  align-items: start;
}

.pricing-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  transition: var(--transition-smooth);
  position: relative;
}

.pricing-card:hover {
  border-color: var(--accent-border);
  transform: translateY(-4px);
}

.pricing-card.featured {
  border-color: var(--accent-color);
  box-shadow: 0 0 40px rgba(77, 124, 253, 0.15);
  background: var(--bg-tertiary);
}

.pricing-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-color);
  color: #ffffff;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  padding: 4px 16px;
  border-radius: var(--radius-pill);
}

.pricing-tier {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent-color);
  margin-bottom: var(--space-md);
}

.pricing-price {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  line-height: 1;
}

.pricing-price span {
  font-size: 1rem;
  font-weight: 400;
  color: var(--text-muted);
}

.pricing-price-note {
  display: inline-block;
  margin-top: 6px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-muted);
  background: var(--white-05);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-pill);
  padding: 2px 10px;
}

.pricing-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin: var(--space-md) 0 var(--space-xl);
  line-height: 1.6;
}

.pricing-features {
  list-style: none;
  margin-bottom: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.pricing-features li .check-icon {
  color: var(--success-green);
  flex-shrink: 0;
  width: 16px;
  height: 16px;
}

/* ============================================================================
   14. APP PREVIEW / SCREENSHOT FRAME
   ============================================================================ */

.app-frame {
  background: var(--neutral-900);
  border: 1px solid var(--neutral-700);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg), 0 0 60px rgba(77, 124, 253, 0.08);
}

.app-frame-bar {
  background: var(--neutral-850);
  padding: 12px 20px;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  border-bottom: 1px solid var(--border-subtle);
}

.frame-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}
.frame-dot.red    { background: #ff5f56; }
.frame-dot.yellow { background: #ffbd2e; }
.frame-dot.green  { background: #27c93f; }

.app-frame-content {
  padding: 0;
}

.app-frame-content img {
  width: 100%;
  height: auto;
  display: block;
}

/* ============================================================================
   15. CTA BANNER
   ============================================================================ */

.cta-banner {
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl) var(--space-xl);
  text-align: center;
}

.cta-banner h2 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  margin-bottom: var(--space-md);
}

.cta-banner p {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 520px;
  margin: 0 auto var(--space-xl);
  line-height: 1.7;
}

/* ============================================================================
   16. FOOTER
   ============================================================================ */

.site-footer {
  border-top: 1px solid var(--border-subtle);
  padding: var(--space-xl) 0;
  color: var(--text-muted);
}

.site-footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer-links {
  display: flex;
  gap: var(--space-lg);
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--text-muted);
}
.footer-links a:hover {
  color: var(--accent-color);
}

/* Theme toggle */
.theme-toggle-wrapper {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.theme-toggle-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
}

.theme-toggle-label svg {
  width: 16px;
  height: 16px;
}

.theme-toggle {
  position: relative;
  width: 44px;
  height: 24px;
  cursor: pointer;
}

.theme-toggle input {
  opacity: 0;
  width: 0;
  height: 0;
  position: absolute;
}

.theme-toggle-track {
  position: absolute;
  inset: 0;
  background: var(--white-10);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-pill);
  transition: var(--transition-base);
}

.theme-toggle-thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  background: var(--text-muted);
  border-radius: 50%;
  transition: var(--transition-smooth);
}

.theme-toggle input:checked ~ .theme-toggle-thumb {
  left: 23px;
  background: var(--accent-color);
}

.theme-toggle:hover .theme-toggle-track {
  border-color: var(--accent-color);
}

/* ============================================================================
   17. DECORATIVE ELEMENTS
   ============================================================================ */

.accent-line {
  width: 60px;
  height: 3px;
  background: var(--accent-color);
  border-radius: 2px;
  box-shadow: 0 0 10px var(--accent-glow);
  margin: var(--space-lg) 0;
}

.accent-line.centered {
  margin-left: auto;
  margin-right: auto;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background: var(--accent-color);
  border-radius: 50%;
  display: inline-block;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 var(--accent-glow); opacity: 1; }
  50%       { box-shadow: 0 0 0 8px transparent; opacity: 0.7; }
}

.bg-gradient-section {
  background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.text-gradient {
  background: linear-gradient(90deg, var(--accent-color), var(--accent-hover));
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 4px 10px;
  background: var(--white-05);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: var(--transition-fast);
}

/* ============================================================================
   18. FORM ELEMENTS
   ============================================================================ */

.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  margin-bottom: var(--space-sm);
}

.form-input {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-main);
  font-size: 0.95rem;
  outline: none;
  transition: var(--transition-base);
}

.form-input:focus {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px var(--accent-dim);
}

.form-input::placeholder {
  color: var(--text-disabled);
}

.email-capture {
  display: flex;
  gap: var(--space-sm);
  max-width: 620px;
  margin: 0 auto;
}

.email-capture .form-input { flex: 1; }

/* Toast notification */
.toast {
  position: fixed;
  bottom: 40px;
  right: 40px;
  padding: 16px 24px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.9rem;
  z-index: 9999;
  opacity: 0;
  transform: translateY(20px);
  transition: var(--transition-smooth);
  pointer-events: none;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.toast.success { border-color: var(--success-green); }
.toast.error   { border-color: var(--error-red); }

/* ============================================================================
   19. USE CASES SECTION
   ============================================================================ */

.usecases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
  margin-top: var(--space-xl);
}

.usecase-tile {
  display: flex;
  flex-direction: column;
  padding: var(--space-lg);
  background: var(--white-02);
  border: 1px solid var(--white-10);
  border-radius: var(--radius-xl);
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.usecase-tile:hover {
  border-color: var(--accent-border);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-4px);
}

.usecase-graphic {
  width: 100%;
  margin-bottom: var(--space-lg);
  border-radius: var(--radius-xl);
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  overflow: hidden;
}

.usecase-graphic-bar {
  background: var(--neutral-850);
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.5px;
}

.usecase-graphic-content {
  padding: var(--space-md);
  min-height: 170px;
  display: flex;
  align-items: stretch;
  justify-content: center;
}

/* ── Use Case HTML Mockups ── */

.uc-mock {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.uc-mock-label {
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  margin-bottom: 2px;
}

/* Staggered fade-in animation for child items */
@keyframes uc-fade-in {
  0%   { opacity: 0; transform: translateY(8px); }
  100% { opacity: 1; transform: translateY(0); }
}

.uc-fade-item {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.uc-fade-item.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Timeline dot pulse */
@keyframes uc-dot-pulse {
  0%   { box-shadow: 0 0 0 0 rgba(77, 124, 253, 0.5); }
  70%  { box-shadow: 0 0 0 10px rgba(77, 124, 253, 0); }
  100% { box-shadow: 0 0 0 0 rgba(77, 124, 253, 0); }
}
.uc-timeline-dot.pulse {
  animation: uc-dot-pulse 1s ease-out;
}

/* ═══ Solar: Knowledge Feed ═══ */

.uc-feed-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  background: var(--neutral-850);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
}

.uc-feed-item svg {
  flex-shrink: 0;
  color: var(--text-muted);
}

.uc-feed-name {
  font-size: 0.72rem;
  color: var(--text-secondary);
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.uc-location-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 2px 7px;
  background: var(--accent-dim);
  border: 1px solid var(--accent-border);
  border-radius: 20px;
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--accent-color);
  flex-shrink: 0;
}

.uc-mock-status {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  background: var(--accent-dim);
  border: 1px solid var(--accent-border);
  border-radius: 6px;
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--accent-color);
  margin-top: auto;
}

.uc-mock-status svg {
  flex-shrink: 0;
}

/* ═══ Medical: Search + Result ═══ */

.uc-search-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.uc-search-bar svg {
  flex-shrink: 0;
  color: var(--accent-color);
}

.uc-typed-query {
  color: var(--text-primary);
  font-weight: 500;
}

.uc-result-card {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  padding: 10px 12px;
}

.uc-result-header {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 4px;
}

.uc-result-header svg {
  flex-shrink: 0;
  color: var(--accent-color);
}

.uc-result-title {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-primary);
}

.uc-result-meta {
  font-size: 0.65rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.uc-result-tags {
  display: flex;
  gap: 5px;
  flex-wrap: wrap;
}

.uc-result-tags .tag {
  font-size: 0.65rem;
  padding: 2px 8px;
}

.uc-wiki-status {
  padding: 8px 10px;
  background: var(--neutral-850);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  margin-top: auto;
}

.uc-wiki-label {
  font-size: 0.6rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.uc-wiki-bar {
  width: 100%;
  height: 3px;
  background: var(--border-subtle);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 5px;
}

.uc-wiki-fill {
  height: 100%;
  width: 0%;
  background: var(--accent-color);
  border-radius: 2px;
  animation: uc-wiki-progress 2.5s ease forwards 0.6s;
}

@keyframes uc-wiki-progress {
  0%   { width: 0%; }
  100% { width: 100%; }
}

.uc-wiki-count {
  font-size: 0.65rem;
  color: var(--text-muted);
}

/* ═══ Infrastructure: Project Cards ═══ */

.uc-project-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.uc-project-card {
  padding: 8px 10px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
}

.uc-project-name {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.uc-project-meta {
  font-size: 0.6rem;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.uc-project-tags {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.uc-project-tags .tag {
  font-size: 0.6rem;
  padding: 2px 6px;
}

.uc-shared-knowledge {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  background: var(--accent-dim);
  border: 1px solid var(--accent-border);
  border-radius: 6px;
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--accent-color);
}

.uc-shared-knowledge svg {
  flex-shrink: 0;
}

.uc-retention-alert {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  background: rgba(255, 200, 0, 0.05);
  border: 1px solid rgba(255, 200, 0, 0.25);
  border-radius: 6px;
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--warning-yellow);
  margin-top: auto;
}

.uc-retention-alert svg {
  flex-shrink: 0;
}

.usecase-tile h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.usecase-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-lg);
  flex: 1;
}

.usecase-stats {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
  padding: var(--space-md) 0;
  border-top: 1px solid var(--white-05);
  border-bottom: 1px solid var(--white-05);
}

.usecase-stat {
  flex: 1;
  text-align: center;
}

.usecase-stat-value {
  display: block;
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--accent-color);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.usecase-stat-label {
  display: block;
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  margin-top: 2px;
}

.usecase-btn {
  align-self: flex-start;
  margin-top: auto;
}

/* ============================================================================
   20. KNOWLEDGE VIZ PREVIEW SECTION
   ============================================================================ */

.viz-preview {
  position: relative;
  max-width: 700px;
  margin: var(--space-xl) auto 0;
}

.viz-frame {
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  min-height: 350px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

/* Animated sunburst placeholder */
.sunburst-placeholder {
  position: relative;
  width: 300px;
  height: 300px;
}

.sunburst-ring {
  position: absolute;
  border: 2px solid var(--accent-border);
  border-radius: 50%;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation: sunburstPulse 4s ease-in-out infinite;
}

.sunburst-ring:nth-child(1) { width: 80px; height: 80px; border-color: var(--accent-color); animation-delay: 0s; }
.sunburst-ring:nth-child(2) { width: 140px; height: 140px; animation-delay: 0.3s; }
.sunburst-ring:nth-child(3) { width: 200px; height: 200px; animation-delay: 0.6s; }
.sunburst-ring:nth-child(4) { width: 260px; height: 260px; animation-delay: 0.9s; }

.sunburst-center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 32px;
  height: 32px;
  background: var(--accent-color);
  border-radius: 50%;
  box-shadow: var(--shadow-glow);
}

@keyframes sunburstPulse {
  0%, 100% { opacity: 0.4; transform: translate(-50%, -50%) scale(1); }
  50%      { opacity: 0.8; transform: translate(-50%, -50%) scale(1.05); }
}

/* ============================================================================
   21. SCROLL ANIMATIONS
   ============================================================================ */

.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-delay-1 { transition-delay: 0.1s; }
.fade-in-delay-2 { transition-delay: 0.2s; }
.fade-in-delay-3 { transition-delay: 0.3s; }
.fade-in-delay-4 { transition-delay: 0.4s; }
.fade-in-delay-5 { transition-delay: 0.5s; }

/* ============================================================================
   22. PRODUCT TOUR PAGE STYLES
   ============================================================================ */

.tour-hero {
  padding: 160px 0 var(--space-2xl);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.tour-hero::before {
  content: '';
  position: absolute;
  top: 20%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255, 0, 60, 0.05) 0%, transparent 70%);
  pointer-events: none;
}

.tour-hero h1 {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin-bottom: var(--space-lg);
  background: linear-gradient(90deg, var(--neutral-050) 0%, var(--neutral-200) 100%);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Video section */
.video-section {
  padding: var(--space-2xl) 0;
}

.video-wrapper {
  max-width: 900px;
  margin: 0 auto;
  position: relative;
}

.video-frame {
  background: var(--neutral-900);
  border: 1px solid var(--neutral-700);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg), 0 0 60px rgba(255, 0, 60, 0.06);
}

.video-frame-bar {
  background: var(--neutral-850);
  padding: 10px 20px;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  border-bottom: 1px solid var(--border-subtle);
}

.video-placeholder {
  position: relative;
  padding-top: 56.25%; /* 16:9 */
  background: var(--bg-primary);
  cursor: pointer;
}

.video-placeholder video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.video-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 80px;
  height: 80px;
  background: var(--accent-color);
  border: none;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-glow);
  transition: var(--transition-smooth);
  z-index: 2;
}

.video-play-btn:hover {
  transform: translate(-50%, -50%) scale(1.1);
  box-shadow: 0 0 50px var(--accent-glow);
}

.video-play-btn svg {
  width: 32px;
  height: 32px;
  color: #ffffff;
  margin-left: 4px;
}

/* Tour steps / interactive elements */
.tour-section {
  padding: var(--space-3xl) 0;
}

.tour-step {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: center;
  margin-bottom: var(--space-3xl);
}

.tour-step:nth-child(even) {
  direction: rtl;
}

.tour-step:nth-child(even) > * {
  direction: ltr;
}

.tour-step-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.tour-step-number {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent-color);
}

.tour-step-content h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.15;
}

.tour-step-content p {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 480px;
}

.tour-step-features {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
}

.tour-step-features li {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.tour-step-features li svg {
  width: 16px;
  height: 16px;
  color: var(--success-green);
  flex-shrink: 0;
}

/* Interactive demo containers */
.tour-demo {
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  overflow: hidden;
  min-height: 350px;
  position: relative;
  user-select: none;
}

.tour-demo-bar {
  background: var(--neutral-850);
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.5px;
}

.tour-demo-content {
  padding: var(--space-lg);
}

/* Simulated chat / debrief interface */
.demo-chat {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  max-height: 340px;
  overflow: hidden;
}

.demo-msg {
  display: flex;
  gap: var(--space-sm);
  align-items: flex-start;
  opacity: 0;
  transform: translateY(10px);
  transition: all 0.4s ease;
}

.demo-msg.visible {
  opacity: 1;
  transform: translateY(0);
}

.demo-msg-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--bg-elevated);
  border: 1px solid var(--border-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-muted);
}

.demo-msg-avatar.ai {
  background: var(--accent-dim);
  border-color: var(--accent-border);
  color: var(--accent-color);
}

.demo-msg-bubble {
  padding: 10px 14px;
  background: var(--white-05);
  border: 1px solid var(--white-10);
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
  max-width: 80%;
}

.demo-msg-bubble.ai {
  background: var(--accent-dim);
  border-color: var(--accent-border);
}

/* Simulated document generation */
.demo-doc {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
}

.demo-doc-sources {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 5px;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--border-subtle);
}

.doc-source-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  background: var(--white-05);
  border: 1px solid var(--border-subtle);
  border-radius: 20px;
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.3px;
}

.doc-source-arrow {
  margin-left: auto;
  color: var(--accent-color);
  display: flex;
  align-items: center;
}

.demo-doc-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--border-subtle);
}

.demo-doc-icon {
  width: 28px;
  height: 28px;
  color: var(--accent-color);
}

.demo-doc-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
}

.demo-doc-meta {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-left: auto;
}

.demo-doc-line {
  height: 8px;
  background: var(--white-05);
  border-radius: 4px;
  margin-bottom: var(--space-sm);
  opacity: 0;
  transform: scaleX(0);
  transform-origin: left;
  transition: all 0.5s ease;
}

.demo-doc-line.visible {
  opacity: 1;
  transform: scaleX(1);
}

.demo-doc-line:nth-child(3) { width: 100%; transition-delay: 0.1s; }
.demo-doc-line:nth-child(4) { width: 85%; transition-delay: 0.2s; }
.demo-doc-line:nth-child(5) { width: 92%; transition-delay: 0.3s; }
.demo-doc-line:nth-child(6) { width: 70%; transition-delay: 0.4s; }
.demo-doc-line:nth-child(7) { width: 95%; transition-delay: 0.5s; }
.demo-doc-line:nth-child(8) { width: 60%; transition-delay: 0.6s; }

.demo-doc-tags {
  display: flex;
  gap: var(--space-xs);
  margin-top: var(--space-md);
  flex-wrap: wrap;
}

/* Simulated search / Astra */
.demo-search {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.demo-search-bar {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 10px 14px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.demo-search-bar svg {
  width: 18px;
  height: 18px;
  color: var(--accent-color);
}

.demo-search-bar .typed-text {
  color: var(--text-primary);
  font-weight: 500;
}

.demo-search-bar .cursor {
  display: inline-block;
  width: 2px;
  height: 16px;
  background: var(--accent-color);
  animation: blink 1s step-end infinite;
  margin-left: 2px;
  vertical-align: middle;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0; }
}

.demo-answer {
  padding: var(--space-md);
  background: var(--accent-dim);
  border: 1px solid var(--accent-border);
  border-radius: var(--radius-md);
  opacity: 0;
  transform: translateY(10px);
  transition: all 0.5s ease;
}

.demo-answer.visible {
  opacity: 1;
  transform: translateY(0);
}

.demo-answer-label {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent-color);
  margin-bottom: var(--space-sm);
}

.demo-answer-label svg {
  width: 14px;
  height: 14px;
}

.demo-answer-text {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.demo-answer-source {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  margin-top: var(--space-sm);
  padding: 4px 10px;
  background: var(--white-05);
  border-radius: var(--radius-sm);
  font-size: 0.7rem;
  color: var(--text-muted);
}

/* Simulated knowledge graph */
.demo-graph {
  position: relative;
  height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.graph-node {
  position: absolute;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-size: 0.6rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition: var(--transition-smooth);
  cursor: default;
  opacity: 0;
  transform: scale(0);
  transition: all 0.5s ease;
  z-index: 1;
}

.graph-node.visible {
  opacity: 1;
  transform: scale(1);
}

.graph-node.center {
  width: 70px;
  height: 70px;
  background: var(--accent-color);
  color: #ffffff;
  box-shadow: var(--shadow-glow);
  font-size: 0.55rem;
  z-index: 2;
}

.graph-node.primary {
  width: 50px;
  height: 50px;
  background: var(--accent-dim);
  border: 1px solid var(--accent-border);
  color: var(--accent-color);
  font-size: 0.5rem;
}

.graph-node.secondary {
  width: 36px;
  height: 36px;
  background: var(--white-05);
  border: 1px solid var(--white-10);
  color: var(--text-muted);
  font-size: 0.45rem;
}

.graph-line {
  position: absolute;
  height: 1px;
  background: var(--accent-border);
  transform-origin: left center;
  opacity: 0;
  transition: opacity 0.5s ease;
}

.graph-line.visible {
  opacity: 1;
}

/* ── Sunburst knowledge-map demo ── */
.demo-sunburst-content {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md) !important;
  min-height: 290px;
}

#demo-sunburst {
  width: 100%;
  max-width: 260px;
}

/* Body-level tooltip – rendered above everything */
.sunburst-tooltip {
  position: fixed;
  z-index: 9999;
  display: none;
  max-width: 220px;
  padding: 9px 13px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.35);
  pointer-events: none;
  line-height: 1.55;
}

.sunburst-tooltip strong {
  display: block;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-color);
  margin-bottom: 3px;
}

.sunburst-tooltip span {
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* Simulated conflict detection */
.demo-conflict {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.demo-conflict-docs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

.conflict-doc {
  padding: var(--space-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.conflict-doc-label {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  margin-bottom: var(--space-sm);
}

.conflict-highlight {
  background: rgba(255, 200, 0, 0.15);
  border-left: 2px solid var(--warning-yellow);
  padding: 4px 8px;
  margin-top: var(--space-sm);
  border-radius: 0 4px 4px 0;
  color: var(--warning-yellow);
  font-weight: 600;
}

.conflict-alert {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md);
  background: rgba(255, 200, 0, 0.05);
  border: 1px solid rgba(255, 200, 0, 0.3);
  border-radius: var(--radius-md);
  font-size: 0.8rem;
  color: var(--warning-yellow);
  opacity: 0;
  transform: translateY(10px);
  transition: all 0.5s ease;
}

.conflict-alert.visible {
  opacity: 1;
  transform: translateY(0);
}

.conflict-alert svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

/* Demo: Integrations / file upload */
.demo-integrations {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 2px 0;
}

.demo-integrations-label {
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  margin-top: 4px;
}

.demo-upload-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  background: var(--neutral-850);
  border-radius: 6px;
  border: 1px solid var(--border-subtle);
  opacity: 0;
  transform: translateX(-8px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.demo-upload-item.visible {
  opacity: 1;
  transform: translateX(0);
}

.demo-upload-item > svg:first-child {
  flex-shrink: 0;
  color: var(--text-muted);
}

.upload-item-name {
  font-size: 0.77rem;
  color: var(--text-secondary);
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.upload-progress-bar {
  width: 56px;
  height: 3px;
  background: var(--border-subtle);
  border-radius: 2px;
  overflow: hidden;
  flex-shrink: 0;
}

.upload-progress-fill {
  height: 100%;
  width: 0%;
  background: var(--accent-color);
  border-radius: 2px;
  transition: width 0.85s ease;
}

.upload-check {
  flex-shrink: 0;
  color: #22c55e;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.upload-check.visible {
  opacity: 1;
}

.demo-confluence-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  background: var(--neutral-850);
  border-radius: 6px;
  border: 1px solid var(--border-subtle);
  opacity: 0;
  transform: translateX(-8px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.demo-confluence-item.visible {
  opacity: 1;
  transform: translateX(0);
}

.confluence-logo {
  width: 30px;
  height: 30px;
  border-radius: 6px;
  background: #0052cc;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 0.78rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.5px;
}

.confluence-info {
  flex: 1;
}

.confluence-name {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-primary);
}

.confluence-status {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.confluence-count {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-color);
  white-space: nowrap;
  flex-shrink: 0;
}

.demo-integrations-complete {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  background: rgba(34, 197, 94, 0.08);
  border: 1px solid rgba(34, 197, 94, 0.22);
  border-radius: 6px;
  font-size: 0.78rem;
  color: var(--text-secondary);
  opacity: 0;
  transition: opacity 0.4s ease;
}

.demo-integrations-complete.visible {
  opacity: 1;
}

.demo-integrations-complete svg {
  color: #22c55e;
  flex-shrink: 0;
}

/* Demo: Vision / image knowledge extraction */
.demo-vision {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.demo-vision-panels {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  align-items: start;
}

.demo-vision-image {
  position: relative;
  background: var(--neutral-800);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  padding: 10px 10px 6px;
  overflow: hidden;
}

.vision-img-label {
  font-size: 0.62rem;
  color: var(--text-muted);
  margin-bottom: 6px;
  font-family: monospace;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.vision-diagram {
  width: 100%;
  height: auto;
  display: block;
  opacity: 0;
  transition: opacity 0.5s ease;
}

.vision-diagram.visible {
  opacity: 1;
}

/* Improve contrast of vision diagram in light mode */
[data-theme="light"] .vision-diagram {
  filter: invert(0.9) hue-rotate(180deg);
}

.vision-scan-line {
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent 0%, var(--accent-color) 40%, rgba(255,0,60,0.6) 60%, transparent 100%);
  top: 28px;
  opacity: 0;
  pointer-events: none;
}

.vision-scan-line.scanning {
  opacity: 1;
  animation: visionScan 1.6s ease-in-out forwards;
}

@keyframes visionScan {
  0%   { top: 28px;  opacity: 1; }
  90%  { top: calc(100% - 8px); opacity: 1; }
  100% { top: calc(100% - 8px); opacity: 0; }
}

.demo-vision-extracted {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 10px;
  background: var(--neutral-850);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  min-height: 130px;
}

.vision-extract-header {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--accent-color);
  margin-bottom: 6px;
}

.vision-extract-item {
  display: flex;
  align-items: flex-start;
  gap: 7px;
  font-size: 0.73rem;
  color: var(--text-secondary);
  line-height: 1.45;
  padding: 5px 7px;
  background: rgba(255,255,255,0.025);
  border-radius: 4px;
  opacity: 0;
  transform: translateX(8px);
  transition: opacity 0.35s ease, transform 0.35s ease;
}

.vision-extract-item.visible {
  opacity: 1;
  transform: translateX(0);
}

.vision-extract-item > svg {
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--accent-color);
}

.vision-also-note {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-align: center;
  padding: 8px 12px;
  border: 1px dashed var(--border-subtle);
  border-radius: 6px;
  opacity: 0;
  transition: opacity 0.5s ease;
}

.vision-also-note.visible {
  opacity: 1;
}

/* ============================================================================
   23. RESPONSIVE
   ============================================================================ */

@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .tour-step { grid-template-columns: 1fr; gap: var(--space-xl); }
  .tour-step:nth-child(even) { direction: ltr; }
  .usecases-grid { grid-template-columns: 1fr; max-width: 520px; margin-left: auto; margin-right: auto; }
}

@media (max-width: 768px) {
  :root { --container-max: 100%; }
  .container { padding: 0 var(--space-md); }
  .section      { padding: var(--space-2xl) 0; }
  .section-sm   { padding: var(--space-xl) 0; }
  .site-header  { padding: 16px 0; }

  .nav-links    { display: none; }
  .mobile-menu-toggle { display: block; }

  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .pricing-grid  { grid-template-columns: 1fr; }

  .hero h1   { font-size: 1.96rem; }
  .lead      { font-size: 1rem; }

  .hero-container { grid-template-columns: 1fr; }
  .hero-content   { align-items: flex-start; }
  .hero-visual    { display: none; }

  .hero-actions { flex-direction: column; width: 100%; }
  .hero-actions .btn { width: 100%; }

  .stat-strip { gap: var(--space-xl); }

  .email-capture { flex-direction: column; }
  .email-capture .form-input,
  .email-capture .btn { width: 100%; }

  .site-footer .container {
    flex-direction: column;
    text-align: center;
  }
  .footer-links { justify-content: center; }
  .theme-toggle-wrapper { justify-content: center; }

  .tour-step { grid-template-columns: 1fr; gap: var(--space-xl); }
  .tour-step:nth-child(even) { direction: ltr; }

  .demo-conflict-docs { grid-template-columns: 1fr; }

  .usecases-grid { grid-template-columns: 1fr; }
}


/* ==========================================================================
   USE CASE DETAIL PAGES
   ========================================================================== */

/* ── Back Link ── */
.uc-back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
  margin-bottom: var(--space-lg);
}
.uc-back-link:hover { color: var(--accent-color); }
.uc-back-link svg { transition: transform 0.2s; }
.uc-back-link:hover svg { transform: translateX(-3px); }

/* ── Detail Hero ── */
.uc-detail-hero {
  padding: var(--space-3xl) 0 var(--space-2xl);
  text-align: center;
}
.uc-detail-hero-content {
  max-width: 720px;
  margin: 0 auto;
}
.uc-detail-hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin: var(--space-sm) 0 var(--space-md);
}
.uc-detail-hero .lead {
  max-width: 640px;
  margin: 0 auto;
}

/* ── Hero Stats Bar ── */
.uc-hero-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  margin-top: var(--space-2xl);
  flex-wrap: wrap;
}
.uc-hero-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}
.uc-hero-stat-value {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  color: var(--accent-color);
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}
.uc-hero-stat-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ── Narrow Content Column ── */
.uc-detail-narrow {
  max-width: 760px;
  margin: 0 auto;
}

/* ── Story Blocks ── */
.uc-story-block {
  margin-bottom: var(--space-xl);
}
.uc-story-block h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-md);
}
.uc-story-block p {
  color: var(--text-secondary);
  line-height: 1.75;
}
.uc-chapter-num {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--accent-color);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--space-xs);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background: rgba(255, 0, 60, 0.08);
  border: 1px solid rgba(255, 0, 60, 0.15);
}

/* ── Challenge Cards ── */
.uc-challenge-cards {
  display: grid;
  gap: var(--space-lg);
  margin-top: var(--space-lg);
}
.uc-challenge-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  transition: border-color 0.3s, transform 0.3s;
}
.uc-challenge-card:hover {
  border-color: var(--accent-color);
  transform: translateY(-2px);
}
.uc-challenge-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: rgba(255, 0, 60, 0.08);
  border: 1px solid rgba(255, 0, 60, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
  color: var(--accent-color);
}
.uc-challenge-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}
.uc-challenge-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ── Timeline ── */
.uc-timeline {
  position: relative;
  padding-left: 32px;
  margin-top: var(--space-xl);
}
.uc-timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--border-primary);
}
.uc-timeline-item {
  position: relative;
  padding-bottom: var(--space-xl);
}
.uc-timeline-item:last-child { padding-bottom: 0; }
.uc-timeline-marker {
  position: absolute;
  left: -32px;
  top: 6px;
}
.uc-timeline-dot {
  display: block;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 3px solid var(--accent-color);
  box-shadow: 0 0 0 4px rgba(255, 0, 60, 0.1);
  transition: box-shadow 0.3s;
}
.uc-timeline-item:hover .uc-timeline-dot {
  box-shadow: 0 0 0 8px rgba(255, 0, 60, 0.15);
}
.uc-timeline-content { /* space managed by parent padding */ }
.uc-timeline-date {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-color);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 6px;
}
.uc-timeline-content h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}
.uc-timeline-content p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ── Moment / Turning Point Cards ── */
.uc-moment-cards {
  display: grid;
  gap: var(--space-xl);
  margin-top: var(--space-lg);
}
.uc-moment-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
}
.uc-moment-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--accent-color);
  background: rgba(255, 0, 60, 0.08);
  border: 1px solid rgba(255, 0, 60, 0.15);
  border-radius: var(--radius-sm);
  padding: 3px 10px;
  margin-bottom: var(--space-sm);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.uc-moment-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}
.uc-moment-card > p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: var(--space-lg);
}

/* ── Moment Mock (Astra / Conflict) ── */
.uc-moment-mock {
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--border-primary);
  background: var(--bg-tertiary);
}
.uc-moment-mock-body {
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}
.uc-astra-query {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  font-size: 0.82rem;
  color: var(--text-secondary);
}
.uc-astra-query svg { color: var(--accent-color); flex-shrink: 0; }
.uc-astra-answer {
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.65;
}
.uc-astra-answer strong { color: var(--text-primary); }
.uc-astra-source {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: var(--space-sm);
  font-size: 0.72rem;
  color: var(--text-muted);
  padding-top: var(--space-xs);
  border-top: 1px solid var(--border-subtle);
}
.uc-astra-source svg { color: var(--accent-color); flex-shrink: 0; }

/* Conflict mock inside moments */
.uc-conflict-alert {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 10px 14px;
  background: rgba(255, 0, 60, 0.06);
  border: 1px solid rgba(255, 0, 60, 0.2);
  border-radius: var(--radius-md);
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.5;
}
.uc-conflict-alert svg { color: var(--accent-color); flex-shrink: 0; margin-top: 2px; }
.uc-conflict-alert strong { color: var(--accent-color); }
.uc-conflict-docs {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: var(--space-sm);
  align-items: center;
}
.uc-conflict-doc {
  padding: 10px 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
}
.uc-conflict-doc-warn {
  border-color: rgba(255, 0, 60, 0.3);
  background: rgba(255, 0, 60, 0.04);
}
.uc-conflict-doc-label {
  display: block;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 4px;
}
.uc-conflict-doc-text {
  font-size: 0.8rem;
  color: var(--text-secondary);
}
.uc-conflict-vs {
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--text-muted);
  text-transform: uppercase;
}

/* Related projects */
.uc-related-projects {
  padding: 10px 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
}
.uc-related-label {
  display: block;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 8px;
}
.uc-related-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

/* ── Results Grid ── */
.uc-results-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}
.uc-result-tile {
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  text-align: center;
  transition: border-color 0.3s, transform 0.3s;
}
.uc-result-tile:hover {
  border-color: var(--accent-color);
  transform: translateY(-2px);
}
.uc-result-icon-ring {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(255, 0, 60, 0.08);
  border: 1px solid rgba(255, 0, 60, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-md);
  color: var(--accent-color);
}
.uc-result-value {
  display: block;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  color: var(--accent-color);
  letter-spacing: -0.03em;
  margin-bottom: 4px;
}
.uc-result-label {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* ── Testimonial Quote ── */
.uc-testimonial {
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
  padding: var(--space-xl) 0;
  border: none;
}
.uc-testimonial p {
  font-size: clamp(1rem, 2vw, 1.2rem);
  font-style: italic;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}
.uc-testimonial p::before { content: ''; }
.uc-testimonial p::after { content: ''; }
.uc-testimonial footer {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.uc-testimonial footer strong {
  font-size: 0.9rem;
  color: var(--text-primary);
}
.uc-testimonial footer span {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ── Before / After (Medical) ── */
.uc-before-after {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: var(--space-lg);
  align-items: start;
  margin-top: var(--space-lg);
}
.uc-ba-col {
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
}
.uc-ba-before { border-color: rgba(255, 0, 60, 0.2); }
.uc-ba-after { border-color: rgba(52, 199, 89, 0.3); }
.uc-ba-label {
  display: block;
  font-size: 0.7rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-md);
}
.uc-ba-before .uc-ba-label { color: var(--accent-color); }
.uc-ba-after .uc-ba-label { color: #34c759; }
.uc-ba-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}
.uc-ba-col li {
  font-size: 0.85rem;
  color: var(--text-secondary);
  padding-left: 20px;
  position: relative;
  line-height: 1.5;
}
.uc-ba-before li::before {
  content: '✕';
  position: absolute;
  left: 0;
  color: var(--accent-color);
  font-weight: 700;
  font-size: 0.7rem;
  top: 2px;
}
.uc-ba-after li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: #34c759;
  font-weight: 700;
  font-size: 0.8rem;
  top: 1px;
}
.uc-ba-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  padding-top: var(--space-3xl);
}

/* ── Flow Steps (Infrastructure) ── */
.uc-flow-steps {
  margin-top: var(--space-xl);
  display: flex;
  flex-direction: column;
  align-items: center;
}
.uc-flow-step {
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  padding: var(--space-lg);
  width: 100%;
  max-width: 560px;
  transition: border-color 0.3s, transform 0.3s;
}
.uc-flow-step:hover {
  border-color: var(--accent-color);
  transform: translateY(-2px);
}
.uc-flow-num {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent-color);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
}
.uc-flow-content h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 4px;
}
.uc-flow-content p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}
.uc-flow-connector {
  width: 2px;
  height: 24px;
  background: var(--border-primary);
  flex-shrink: 0;
}

/* ── Counter Animation ── */
.uc-count {
  transition: none;
}

/* ── Responsive for Detail Pages ── */
@media (max-width: 768px) {
  .uc-results-grid {
    grid-template-columns: 1fr;
  }
  .uc-hero-stats {
    gap: var(--space-lg);
  }
  .uc-before-after {
    grid-template-columns: 1fr;
  }
  .uc-ba-divider {
    padding-top: 0;
    transform: rotate(90deg);
  }
  .uc-conflict-docs {
    grid-template-columns: 1fr;
  }
  .uc-conflict-vs {
    text-align: center;
  }
}