/* ==========================================================================
   AEGIS RESEARCH OS (AE-02) — DESIGN SYSTEM & LANDING PAGE STYLES
   Brutalist Editorial Showroom on Warm Canvas (#e5e5e5)
   Optimized for High-Resolution PC Desktop Viewports (1440px+)
   Based on DESIGN (3).md
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Barlow+Condensed:wght@700&family=Inter:wght@400;450;500;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  /* Surface & Brand Colors */
  --color-carbon-black: #000000;
  --color-paper-white: #ffffff;
  --color-warm-canvas: #e5e5e5;
  --color-mist-gray: #f3f3f3;
  --color-ash: #c6c6c6;
  --color-smoke: #979797;
  --color-slate: #444444;
  --color-graphite: #2f2f2f;
  --color-mint-chip: #d1ffca;
  --color-voltage-yellow: #fff100;

  /* Typography — Font Families */
  --font-display: 'Barlow Condensed', 'Barlow', ui-sans-serif, sans-serif;
  --font-body: 'Inter', ui-sans-serif, system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, monospace;

  /* Typography — Scale */
  --text-caption: 12px;
  --leading-caption: 1.6;
  --tracking-caption: -0.36px;

  --text-body-sm: 14px;
  --leading-body-sm: 1.3;
  --tracking-body-sm: -0.154px;

  --text-body: 16px;
  --leading-body: 1.25;

  --text-subheading: 18px;
  --leading-subheading: 1.33;

  --text-subheading-lg: 20px;
  --leading-subheading-lg: 1.2;

  --text-heading-sm: 28px;
  --leading-heading-sm: 1.3;
  --tracking-heading-sm: -0.84px;

  --text-heading: 42px;
  --leading-heading: 1.05;
  --tracking-heading: -0.8px;

  --text-heading-lg: 52px;
  --leading-heading-lg: 0.9;
  --tracking-heading-lg: -1.44px;

  --text-display: 88px;
  --leading-display: 0.88;
  --tracking-display: -2.4px;

  --text-display-xl: 136px;
  --leading-display-xl: 0.88;
  --tracking-display-xl: -4px;

  /* Weights */
  --font-weight-regular: 400;
  --font-weight-w450: 450;
  --font-weight-medium: 500;
  --font-weight-bold: 700;

  /* Spacing */
  --spacing-8: 8px;
  --spacing-16: 16px;
  --spacing-24: 24px;
  --spacing-40: 40px;
  --spacing-64: 64px;
  --spacing-80: 80px;
  --spacing-96: 96px;

  /* Layout — Ultra-Wide Widescreen PC First */
  --page-max-width: 1720px;
  --section-gap: 104px;
  --card-padding: 36px;

  /* Border Radii */
  --radius-button: 8px;
  --radius-ghost-button: 4px;
  --radius-card: 32px;
  --radius-card-sm: 24px;
  --radius-nav-pill: 48px;
  --radius-tag: 64px;
  --radius-top-arc: 64px 64px 0 0;

  /* Surfaces */
  --surface-canvas: var(--color-warm-canvas);
  --surface-card: var(--color-paper-white);
  --surface-inverted: var(--color-carbon-black);
  --surface-mist: var(--color-mist-gray);
}

/* Base Reset & Typography Setup */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  box-shadow: none !important; /* CRITICAL DESIGN RULE: STRICTLY FLAT SURFACES, ZERO SHADOWS */
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  background-color: var(--surface-canvas);
  color: var(--color-carbon-black);
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: var(--leading-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  position: relative;
  overflow-x: hidden;
}

/* MOVING GRID BACKGROUND — CONTINUOUS VISIBLE DIAGONAL SCROLL */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  background-image: 
    linear-gradient(to right, rgba(0, 0, 0, 0.095) 1.5px, transparent 1.5px),
    linear-gradient(to bottom, rgba(0, 0, 0, 0.095) 1.5px, transparent 1.5px);
  background-size: 54px 54px;
  animation: moveGrid 14s linear infinite;
  pointer-events: none;
}

@keyframes moveGrid {
  0% {
    background-position: 0 0;
  }
  100% {
    background-position: 54px 54px;
  }
}


/* ON-SCROLL TYPOGRAPHY & ELEMENT REVEAL ANIMATIONS */
.scroll-reveal {
  opacity: 0;
  transform: translateY(36px);
  transition: opacity 0.75s cubic-bezier(0.16, 1, 0.3, 1), transform 0.75s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.scroll-reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }



/* Container — Wide Desktop Grid Alignment */
.container {
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: 0 60px;
}

/* Typography Utility Classes */
.text-display-xl {
  font-family: var(--font-display);
  font-size: clamp(88px, 8.8vw, 150px);
  font-weight: var(--font-weight-bold);
  line-height: 0.88;
  letter-spacing: var(--tracking-display-xl);
  text-transform: uppercase;
}

.text-display {
  font-family: var(--font-display);
  font-size: var(--text-display);
  font-weight: var(--font-weight-bold);
  line-height: var(--leading-display);
  letter-spacing: var(--tracking-display);
  text-transform: uppercase;
}

.text-heading {
  font-family: var(--font-body);
  font-size: var(--text-heading);
  font-weight: var(--font-weight-w450);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  text-transform: uppercase;
}

.text-subheading-lg {
  font-family: var(--font-body);
  font-size: var(--text-subheading-lg);
  line-height: var(--leading-subheading-lg);
}

.mono-label {
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  line-height: var(--leading-caption);
  letter-spacing: var(--tracking-caption);
  text-transform: uppercase;
}

/* Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-carbon-black);
  color: var(--color-paper-white);
  font-family: var(--font-body);
  font-size: var(--text-body);
  font-weight: var(--font-weight-medium);
  padding: var(--spacing-16) var(--spacing-32, 32px);
  border-radius: var(--radius-button);
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: opacity 0.2s ease, transform 0.1s ease;
}

.btn-primary:hover {
  opacity: 0.88;
}

.btn-primary:active {
  transform: scale(0.98);
}

/* HEADER START CHAT CAPSULE BUTTON */
#header-cta-btn {
  padding: 8px 18px !important;
  font-size: 13px !important;
  font-weight: var(--font-weight-medium);
  letter-spacing: 0.5px;
  border-radius: 9999px !important; /* Capsule shape */
  background-color: var(--color-carbon-black);
  color: var(--color-paper-white);
  border: 1.5px solid var(--color-carbon-black);
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1), background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease;
  position: relative;
  overflow: hidden;
}

#header-cta-btn:hover {
  transform: translateY(-2px) scale(1.05) !important;
  background-color: var(--color-mint-chip) !important;
  color: var(--color-carbon-black) !important;
  border-color: var(--color-carbon-black) !important;
  opacity: 1 !important;
}

#header-cta-btn:active {
  transform: scale(0.96) !important;
}


.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: transparent;
  color: var(--color-slate);
  font-family: var(--font-body);
  font-size: var(--text-body);
  font-weight: var(--font-weight-medium);
  padding: var(--spacing-16) var(--spacing-32, 32px);
  border-radius: var(--radius-ghost-button);
  border: 1.5px solid var(--color-slate);
  cursor: pointer;
  text-decoration: none;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.btn-ghost:hover {
  background-color: var(--color-slate);
  color: var(--color-paper-white);
}

.btn-link {
  display: inline-flex;
  align-items: center;
  background-color: transparent;
  color: var(--color-carbon-black);
  font-family: var(--font-body);
  font-size: var(--text-body);
  font-weight: var(--font-weight-medium);
  border: none;
  cursor: pointer;
  text-decoration: none;
}

.btn-link:hover {
  text-decoration: underline;
}

/* Mint Tag */
.mint-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-8);
  background-color: var(--color-mint-chip);
  color: var(--color-carbon-black);
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  font-weight: var(--font-weight-regular);
  letter-spacing: var(--tracking-caption);
  padding: var(--spacing-8) var(--spacing-16);
  border-radius: var(--radius-tag);
  text-transform: uppercase;
  width: fit-content;
}

/* Voltage Yellow Highlight */
.voltage-highlight {
  background-color: var(--color-voltage-yellow);
  color: var(--color-carbon-black);
  padding: 2px 6px;
  font-weight: var(--font-weight-bold);
  border-radius: 2px;
}

.voltage-dot {
  width: 8px;
  height: 8px;
  background-color: var(--color-voltage-yellow);
  border-radius: 50%;
  display: inline-block;
}

.mint-dot {
  width: 8px;
  height: 8px;
  background-color: var(--color-mint-chip);
  border-radius: 50%;
  display: inline-block;
}

/* TOP NAVIGATION BAR — SHORTER SLIMMER PC PILL */
.header-wrapper {
  height: 5.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(229, 229, 229, 0.92);
  backdrop-filter: blur(10px);
  padding: 0 60px;
}

.nav-pill {
  width: 100%;
  max-width: var(--page-max-width);
  height: 60px;
  background-color: var(--surface-card);
  border-radius: var(--radius-nav-pill);
  padding: 0 var(--spacing-32, 32px);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* DYNAMIC MECHANICAL 3D CUBE-CHAIN / BINARY CLOCK LETTER FLIP */
.word-flip-container {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  perspective: 1000px;
  vertical-align: middle;
  min-height: 1.1em;
  margin: 6px 0;
  max-width: 100%;
}

.char-cube {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 12px;
  height: 1.05em;
  background-color: var(--color-mint-chip);
  color: var(--color-carbon-black);
  border-radius: 12px;
  font-family: var(--font-display);
  font-size: clamp(52px, 5.8vw, 110px); /* Bold prominent flipping letter cubes */
  font-weight: var(--font-weight-bold);
  line-height: 1;
  text-transform: uppercase;
  transform-style: preserve-3d;
  transition: transform 0.45s cubic-bezier(0.68, -0.55, 0.265, 1.55), opacity 0.35s ease, background-color 0.2s ease;
  will-change: transform, opacity;
  box-shadow: 0 3px 0 rgba(0, 0, 0, 0.18) !important; /* Mechanical edge depth */
}

.char-cube.flip-out {
  transform: rotateX(-90deg) scale(0.85);
  opacity: 0;
  background-color: var(--color-voltage-yellow);
}

.char-cube.flip-in {
  transform: rotateX(90deg) scale(0.85);
  opacity: 0;
}

.char-cube:hover {
  background-color: var(--color-voltage-yellow);
  transform: scale(1.08) rotate(2deg);
}




.brand-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-8);
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.5px;
  color: var(--color-carbon-black);
  text-decoration: none;
  text-transform: uppercase;
}

.brand-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  background-color: var(--color-carbon-black);
  color: var(--color-paper-white);
  padding: 3px 8px;
  border-radius: 4px;
  letter-spacing: 0.5px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-40);
  list-style: none;
}

.nav-link {
  color: var(--color-slate);
  font-family: var(--font-body);
  font-size: var(--text-body);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  transition: color 0.15s ease;
}

.nav-link:hover {
  color: var(--color-carbon-black);
}

/* HERO SECTION — WIDESCREEN PC DISPLAY */
.hero-section {
  padding-top: var(--spacing-40);
  padding-bottom: var(--section-gap);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: var(--spacing-64);
  align-items: flex-start; /* Lock vertical alignment */
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-24);
  min-height: 480px; /* Stable container height */
}

.hero-title {
  color: var(--color-carbon-black);
  word-break: break-word;
  min-height: 180px; /* Lock title height to absorb letter line variations */
}

.hero-description {
  font-size: 20px;
  color: var(--color-slate);
  max-width: 600px;
  line-height: 1.35;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-24);
  margin-top: var(--spacing-16);
}

.hero-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-32, 32px);
  margin-top: var(--spacing-24);
  border-top: 1px solid var(--color-ash);
  padding-top: var(--spacing-24);
}

.hero-meta-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-8);
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  color: var(--color-smoke);
}

/* 3D PRODUCT CARD SHOWROOM — PC EXPANDED */
.hero-visual-card {
  background-color: var(--surface-card);
  border-radius: var(--radius-card);
  padding: 40px;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-24);
  position: relative;
  overflow: hidden;
  border: 1px solid var(--color-ash);
  align-self: flex-start; /* Lock showroom card layout */
  width: 100%;
}

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

.visual-status {
  display: flex;
  align-items: center;
  gap: var(--spacing-8);
}

.cube-showroom {
  background-color: var(--color-mist-gray);
  border-radius: 24px;
  padding: 40px 24px;
  min-height: 340px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-24);
  position: relative;
}

.rendered-nodes {
  display: flex;
  gap: var(--spacing-16);
  flex-wrap: wrap;
  justify-content: center;
}

.node-block {
  background-color: var(--color-carbon-black);
  color: var(--color-paper-white);
  padding: var(--spacing-24);
  border-radius: 14px;
  font-family: var(--font-mono);
  font-size: 15px;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-8);
  min-width: 160px;
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), background-color 0.3s ease, border-color 0.3s ease;
  cursor: pointer;
  border: 1px solid transparent;
}

.rendered-nodes:nth-child(1) .node-block:nth-child(1) { animation: floatNode1 4.2s ease-in-out infinite; }
.rendered-nodes:nth-child(1) .node-block:nth-child(2) { animation: floatNode2 5s ease-in-out infinite 0.4s; }
.rendered-nodes:nth-child(1) .node-block:nth-child(3) { animation: floatNode1 4.6s ease-in-out infinite 0.8s; }

.rendered-nodes:nth-child(2) .node-block:nth-child(1) { animation: floatNode2 4.8s ease-in-out infinite 0.2s; }
.rendered-nodes:nth-child(2) .node-block:nth-child(2) { animation: floatNode1 5.2s ease-in-out infinite 0.6s; }
.rendered-nodes:nth-child(2) .node-block:nth-child(3) { animation: floatNode2 4.4s ease-in-out infinite 1s; }

@keyframes floatNode1 {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-7px) rotate(1deg); }
}

@keyframes floatNode2 {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(7px) rotate(-1deg); }
}

.node-block:hover {
  transform: scale(1.06) translateY(-6px) !important;
  background-color: var(--color-carbon-black) !important;
  color: var(--color-mint-chip) !important;
  border-color: var(--color-mint-chip) !important;
  z-index: 10;
}

.node-block.highlight {
  background-color: var(--color-mint-chip);
  color: var(--color-carbon-black);
}

.node-label {
  font-size: 10px;
  opacity: 0.7;
}

.node-value {
  font-weight: var(--font-weight-bold);
}

.visual-status .mint-dot {
  animation: pulseDot 2s ease-in-out infinite;
}

@keyframes pulseDot {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.6); opacity: 0.5; }
}


.visual-graph-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-16);
  width: 100%;
  background-color: var(--surface-card);
  padding: var(--spacing-24);
  border-radius: 14px;
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  color: var(--color-slate);
}

/* STATS BAND — FULL WIDTH PC GRID */
.stats-section {
  padding-bottom: var(--section-gap);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-32, 32px);
}

.stat-card {
  background-color: var(--surface-card);
  border-radius: var(--radius-card-sm);
  padding: var(--spacing-32, 32px);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-12, 12px);
}

.stat-number {
  font-family: var(--font-display);
  font-size: 64px;
  font-weight: var(--font-weight-bold);
  line-height: 0.9;
  color: var(--color-carbon-black);
}

.stat-desc {
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  color: var(--color-smoke);
  text-transform: uppercase;
}

/* LIVE SIMULATOR DEMO WIDGET — PC LAYOUT */
.demo-section {
  padding-bottom: var(--section-gap);
}

.demo-card {
  background-color: var(--surface-card);
  border-radius: var(--radius-card);
  padding: 48px;
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.demo-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  border-bottom: 1px solid var(--color-ash);
  padding-bottom: var(--spacing-24);
}

.preset-queries {
  display: flex;
  gap: var(--spacing-12, 12px);
  flex-wrap: wrap;
}

.preset-btn {
  background-color: var(--color-mist-gray);
  color: var(--color-carbon-black);
  border: none;
  padding: 10px 20px;
  border-radius: 20px;
  font-family: var(--font-mono);
  font-size: 13px;
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.preset-btn:hover {
  background-color: var(--color-ash);
}

.preset-btn.active {
  background-color: var(--color-carbon-black);
  color: var(--color-paper-white);
}

.interactive-box {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.query-input-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-16);
}

.query-textarea {
  width: 100%;
  height: 160px;
  background-color: var(--color-mist-gray);
  border: 1px solid var(--color-ash);
  border-radius: 16px;
  padding: var(--spacing-24);
  font-family: var(--font-body);
  font-size: var(--text-body);
  color: var(--color-carbon-black);
  resize: none;
  outline: none;
}

.query-textarea:focus {
  border-color: var(--color-carbon-black);
}

.execution-timeline {
  background-color: var(--color-graphite);
  color: var(--color-paper-white);
  border-radius: 16px;
  padding: var(--spacing-24);
  font-family: var(--font-mono);
  font-size: 13px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-height: 300px;
  overflow-y: auto;
}

.log-entry {
  display: flex;
  gap: 12px;
  opacity: 0;
  transform: translateY(6px);
  animation: fadeInLog 0.3s forwards;
}

@keyframes fadeInLog {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.log-time {
  color: var(--color-smoke);
}

.log-msg {
  color: var(--color-paper-white);
}

.log-entry.success .log-msg {
  color: var(--color-mint-chip);
}

.log-entry.warning .log-msg {
  color: var(--color-voltage-yellow);
}

/* FEATURES GRID — 2 WIDE COLUMNS ON PC */
.features-section {
  padding-bottom: var(--section-gap);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  margin-top: var(--spacing-40);
}

.feature-card {
  background-color: var(--surface-card);
  border-radius: var(--radius-card);
  padding: 48px;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-24);
}

.feature-title {
  color: var(--color-carbon-black);
}

.feature-desc {
  color: var(--color-slate);
  line-height: var(--leading-subheading-lg);
  font-size: 18px;
}

.feature-footer {
  margin-top: auto;
  padding-top: var(--spacing-24);
  border-top: 1px solid var(--color-mist-gray);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* ARCHITECTURE SHOWCASE (INVERTED BLACK TOP-ARC CARD) */
.architecture-section {
  padding-bottom: var(--section-gap);
}

.top-arc-inverted {
  background-color: var(--surface-inverted);
  color: var(--color-paper-white);
  border-radius: var(--radius-top-arc);
  padding: 96px 64px;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-40);
}

.arch-header {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-16);
}

.arch-title {
  color: var(--color-paper-white);
}

.arch-desc {
  color: var(--color-smoke);
  max-width: 720px;
  font-size: 18px;
}

.arch-pipeline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: var(--spacing-24);
}

.pipeline-step {
  background-color: var(--color-graphite);
  padding: 32px 24px;
  border-radius: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  border: 1px solid #3a3a3a;
}

.step-num {
  font-family: var(--font-mono);
  color: var(--color-mint-chip);
  font-size: 14px;
}

.step-title {
  font-weight: var(--font-weight-medium);
  font-size: 22px;
}

.step-detail {
  font-size: var(--text-body);
  color: var(--color-smoke);
  line-height: 1.35;
}

/* USE CASE LIBRARY */
.use-cases-section {
  padding-bottom: var(--section-gap);
}

.use-case-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-top: var(--spacing-40);
}

.use-case-card {
  background-color: var(--surface-card);
  border-radius: var(--radius-card-sm);
  padding: 40px;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-24);
}

/* INVERTED FAQ & CALLOUT */
.faq-section {
  background-color: var(--surface-inverted);
  color: var(--color-paper-white);
  padding: 96px 0;
}

.faq-title {
  color: var(--color-paper-white);
  margin-bottom: var(--spacing-40);
}

.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-24);
  max-width: 960px;
}

.faq-item {
  border-bottom: 1px solid var(--color-graphite);
  padding-bottom: var(--spacing-24);
}

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 22px;
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  padding: 16px 0;
}

.faq-answer {
  color: var(--color-smoke);
  font-size: 18px;
  line-height: 1.4;
  padding-top: var(--spacing-12, 12px);
  display: none;
}

.faq-item.active .faq-answer {
  display: block;
}

/* FOOTER */
.site-footer {
  background-color: var(--surface-canvas);
  border-top: 1px solid var(--color-ash);
  padding: 80px 0 40px 0;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 48px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-16);
}

.footer-email {
  font-family: var(--font-mono);
  font-size: 16px;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--color-ash);
  padding-top: var(--spacing-24);
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  color: var(--color-smoke);
}

/* RESPONSIVE MEDIA QUERIES FOR TABLET & MOBILE DOWN-SCALING */
@media (max-width: 1200px) {
  :root {
    --page-max-width: 1040px;
    --text-display-xl: 100px;
  }

  .container {
    padding: 0 24px;
  }

  .hero-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .text-display-xl {
    font-size: 80px;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .arch-pipeline {
    grid-template-columns: repeat(2, 1fr);
  }

  .use-case-grid {
    grid-template-columns: 1fr;
  }

  .interactive-box {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .text-display-xl {
    font-size: 56px;
  }

  .nav-links {
    display: none;
  }

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

  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: var(--spacing-24);
}

.pipeline-step {
  background-color: var(--color-graphite);
  padding: 32px 24px;
  border-radius: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  border: 1px solid #3a3a3a;
}

.step-num {
  font-family: var(--font-mono);
  color: var(--color-mint-chip);
  font-size: 14px;
}

.step-title {
  font-weight: var(--font-weight-medium);
  font-size: 22px;
}

.step-detail {
  font-size: var(--text-body);
  color: var(--color-smoke);
  line-height: 1.35;
}

/* USE CASE LIBRARY */
.use-cases-section {
  padding-bottom: var(--section-gap);
}

.use-case-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-top: var(--spacing-40);
}

.use-case-card {
  background-color: var(--surface-card);
  border-radius: var(--radius-card-sm);
  padding: 40px;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-24);
}

/* INVERTED FAQ & CALLOUT */
.faq-section {
  background-color: var(--surface-inverted);
  color: var(--color-paper-white);
  padding: 96px 0;
}

.faq-title {
  color: var(--color-paper-white);
  margin-bottom: var(--spacing-40);
}

.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-24);
  max-width: 960px;
}

.faq-item {
  border-bottom: 1px solid var(--color-graphite);
  padding-bottom: var(--spacing-24);
}

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 22px;
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  padding: 16px 0;
}

.faq-answer {
  color: var(--color-smoke);
  font-size: 18px;
  line-height: 1.4;
  padding-top: var(--spacing-12, 12px);
  display: none;
}

.faq-item.active .faq-answer {
  display: block;
}

/* FOOTER */
.site-footer {
  background-color: var(--surface-canvas);
  border-top: 1px solid var(--color-ash);
  padding: 80px 0 40px 0;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 48px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-16);
}

.footer-email {
  font-family: var(--font-mono);
  font-size: 16px;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--color-ash);
  padding-top: var(--spacing-24);
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  color: var(--color-smoke);
}

/* RESPONSIVE MEDIA QUERIES FOR TABLET & MOBILE DOWN-SCALING */
@media (max-width: 1200px) {
  :root {
    --page-max-width: 1040px;
    --text-display-xl: 100px;
  }

  .container {
    padding: 0 24px;
  }

  .hero-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .text-display-xl {
    font-size: 80px;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .arch-pipeline {
    grid-template-columns: repeat(2, 1fr);
  }

  .use-case-grid {
    grid-template-columns: 1fr;
  }

  .interactive-box {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .text-display-xl {
    font-size: 56px;
  }

  .nav-links {
    display: none;
  }

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

  .arch-pipeline {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   CHAT MODAL IFRAME
   ========================================================================== */
.chat-modal {
  display: none;
  position: fixed;
  z-index: 9999;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.9);
  align-items: center;
  justify-content: center;
}

.chat-modal.show {
  display: flex;
}

.chat-modal-content {
  background-color: var(--color-paper-white);
  width: 100vw;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.chat-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-16) var(--spacing-24);
  background-color: var(--color-carbon-black);
  color: var(--color-voltage-yellow);
  border-bottom: 1px solid var(--color-ash);
}

.chat-modal-close {
  background: none;
  border: 1px solid var(--color-ash);
  border-radius: var(--radius-button);
  color: var(--color-paper-white);
  font-size: 14px;
  font-family: var(--font-mono);
  cursor: pointer;
  padding: 8px 16px;
  transition: all 0.2s ease;
}

.chat-modal-close:hover {
  color: var(--color-carbon-black);
  background-color: var(--color-voltage-yellow);
  border-color: var(--color-voltage-yellow);
}

.chat-iframe {
  width: 100%;
  flex-grow: 1;
  border: none;
  background-color: #0E1117; /* Streamlit dark mode bg */
}