/* ============================================================
   IIOS Agent Platform — app.css
   Ultra-modern marketing site + AI chat platform.
   Pure CSS custom properties. No Tailwind.
   Supports: hero mode (IO) + chat mode (Aura)
   ============================================================ */

/* ── Custom Properties ─────────────────────────────────────── */
:root {
  --accent:           #2a579a;
  --accent-dark:      #1e3f73;
  --accent-light:     #3b6fb7;
  --accent-soft:      #dce8ef;
  --accent-xsoft:     #f0f5fa;

  --bg:               #ffffff;
  --bg-alt:           #f8fafc;
  --bg-dark:          #0b0f19;
  --bg-dark-alt:      #131825;

  --text:             #1a1c1f;
  --text-muted:       #4b5563;
  --text-subtle:      #6b7280;

  --panel:            rgba(255, 255, 255, 0.92);
  --panel-dark:       rgba(22, 26, 33, 0.92);
  --border:           rgba(16, 19, 26, 0.06);
  --border-dark:      rgba(245, 247, 251, 0.08);

  --font-sans: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-brand: "Lato", "Inter", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "Menlo", "Consolas", monospace;

  --radius-sm:   8px;
  --radius:      16px;
  --radius-lg:   24px;
  --radius-pill: 9999px;

  --shadow-sm:  0 1px 3px rgba(0,0,0,0.04);
  --shadow:     0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg:  0 16px 48px rgba(16,24,40,0.12);
  --shadow-xl:  0 24px 64px rgba(16,24,40,0.16);
  --shadow-btn: 0 8px 24px rgba(42,87,154,0.3);

  --transition:      0.2s ease;
  --transition-slow: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark mode overrides */
body.dark {
  --bg:     var(--bg-dark);
  --bg-alt: var(--bg-dark-alt);
  --text:   #f0f2f5;
  --text-muted: #9ca3af;
  --panel:  var(--panel-dark);
  --border: var(--border-dark);
}

/* ── Base Reset ─────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  transition: background var(--transition-slow), color var(--transition-slow);
  overflow-x: hidden;
}

/* Accessibility: screen-reader only */
.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;
}

/* Layout toggling */
.layout { display: contents; }
.layout[hidden] { display: none !important; }

/* ── Shared Buttons ─────────────────────────────────────────── */
button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  transition: transform var(--transition), box-shadow var(--transition),
              background var(--transition), opacity var(--transition);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #f9fafb;
  padding: 0.75rem 1.4rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: 0.01em;
  box-shadow: var(--shadow-btn);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}
.btn-primary:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 12px 32px rgba(42,87,154,0.4);
}
.btn-primary:active:not(:disabled) { transform: translateY(0); }
.btn-primary:disabled { opacity: 0.4; cursor: not-allowed; box-shadow: none; }

.btn-ghost {
  background: transparent;
  color: inherit;
  border: 1px solid rgba(42,87,154,0.2);
  padding: 0.75rem 1.4rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}
.btn-ghost:hover:not(:disabled) { background: rgba(42,87,154,0.06); border-color: rgba(42,87,154,0.35); }

.btn-send {
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  border-radius: var(--radius-pill);
  padding: 0 1rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  box-shadow: var(--shadow);
  white-space: nowrap;
}
.btn-send:hover:not(:disabled) {
  box-shadow: 0 8px 24px rgba(42,87,154,0.35);
  transform: translateY(-1px);
}
.btn-send:disabled { opacity: 0.4; cursor: not-allowed; }

/* ── Shared Utilities ───────────────────────────────────────── */
.error-box {
  background: #fef2f2;
  color: #991b1b;
  border: 1px solid #fecaca;
  padding: 1rem;
  border-radius: var(--radius-sm);
  text-align: left;
  font-size: 0.95rem;
}

.keyword {
  color: #60a5fa;
  text-decoration: underline dotted;
  text-underline-offset: 3px;
  cursor: pointer;
  transition: color var(--transition);
}
.keyword:hover { color: #93c5fd; }

.mermaid-container {
  background: linear-gradient(135deg, #f8fafc 0%, #eef2f7 100%);
  border: 1px solid rgba(42, 87, 154, 0.15);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  margin: 1.5rem 0;
  display: flex; justify-content: center; align-items: center;
  overflow-x: auto;
  box-shadow: 0 2px 12px rgba(42, 87, 154, 0.08), 0 1px 3px rgba(0,0,0,0.04);
}
.mermaid-container svg {
  max-width: 100%; height: auto;
  filter: drop-shadow(0 1px 2px rgba(0,0,0,0.06));
}
body.dark .mermaid-container {
  background: linear-gradient(135deg, rgba(16,19,26,0.6) 0%, rgba(26,26,46,0.4) 100%);
  border-color: rgba(74, 111, 165, 0.25);
  box-shadow: 0 2px 12px rgba(0,0,0,0.2);
}

.mermaid-error {
  background: rgba(239,68,68,0.08);
  color: #991b1b;
  border-radius: var(--radius-sm);
  padding: 0.75rem;
}

/* Typewriter caret */
.typewriter { display: inline-flex; align-items: baseline; }
.caret {
  display: inline-block; width: 2px; height: 1em;
  margin-left: 4px; background: currentColor;
  animation: blink 1s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* Prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}


/* ═══════════════════════════════════════════════════════════════
   HERO MODE
   ═══════════════════════════════════════════════════════════════ */

/* ── Hero Section (fills viewport, can grow with content) ──── */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 8rem 1rem 12rem;
}

/* ── Video Background (fixed behind hero, contained to viewport) ── */
#hero-video-bg {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100vh;
  z-index: -2;
  overflow: hidden;
}
#hero-video {
  position: absolute;
  top: 50%; left: 50%;
  min-width: 100%; min-height: 100%;
  width: auto; height: auto;
  transform: translate(-50%, -50%);
  object-fit: cover;
}
#hero-overlay {
  position: absolute; inset: 0;
  background-color: rgba(10, 15, 30, 0.55);
  background-image: url(/media/pattern.png);
  background-blend-mode: overlay;
  opacity: 0.8;
  z-index: 1;
}

@media (prefers-reduced-motion: reduce) {
  #hero-video { animation: none; }
}

/* ── Hero Header ────────────────────────────────────────────── */
.hero-header {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 100; padding: 0.5rem 0;
  transition: background var(--transition-slow), box-shadow var(--transition-slow),
              backdrop-filter var(--transition-slow);
}

.header-inner {
  max-width: 1280px; margin: 0 auto;
  padding: 0 2rem;
  display: flex; align-items: center; justify-content: space-between;
}

.header-logo {
  height: 4rem;
  display: block;
}

/* Logo visibility: light by default, dark when scrolled */
#logo-dark  { display: none; }

.hero-header.scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px) saturate(1.4);
  box-shadow: 0 1px 0 rgba(0,0,0,0.06);
}
.hero-header.scrolled #logo-light { display: none; }
.hero-header.scrolled #logo-dark  { display: block; }

/* Desktop nav */
.hero-nav {
  display: flex; align-items: center; gap: 0.25rem;
}
.nav-link {
  padding: 0.5rem 1rem;
  text-decoration: none;
  color: rgba(255,255,255,0.9);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border-radius: var(--radius-pill);
  transition: background var(--transition), color var(--transition);
}
.nav-link:hover {
  background: rgba(255,255,255,0.12);
  color: #fff;
}
.nav-sep {
  color: rgba(255,255,255,0.4);
  font-size: 0.75rem;
  user-select: none;
}
.hero-header.scrolled .nav-sep {
  color: rgba(42,87,154,0.3);
}
.hero-header.scrolled .nav-link {
  color: var(--text-muted);
}
.hero-header.scrolled .nav-link:hover {
  background: rgba(42,87,154,0.06);
  color: var(--accent);
}

/* Mobile menu button */
.mobile-menu-btn {
  display: none;
  background: transparent; border: none;
  font-size: 1.2rem; color: rgba(255,255,255,0.9);
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}
.mobile-menu-btn:hover { background: rgba(255,255,255,0.1); }
.hero-header.scrolled .mobile-menu-btn { color: var(--text); }

/* Mobile nav */
.hero-mobile-nav {
  display: flex; flex-direction: column;
  background: rgba(255,255,255,0.98);
  backdrop-filter: blur(20px);
  border-top: 1px solid var(--border);
  padding: 0.5rem 1rem;
}
.hero-mobile-nav[hidden] { display: none; }
.mobile-nav-link {
  padding: 0.85rem 1rem;
  text-decoration: none;
  color: var(--text);
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}
.mobile-nav-link:hover { background: rgba(42,87,154,0.06); }

@media (max-width: 767px) {
  .hero-nav { display: none; }
  .mobile-menu-btn { display: flex; align-items: center; }
}

/* ── Hero Stage (AI response area) ──────────────────────────── */
#hero-stage {
  width: 100%;
}

#hero-stage-inner {
  max-width: 80ch;
  width: min(1100px, 92vw);
  margin: 0 auto;
  text-align: center;
}

#hero-text {
  color: white;
  text-shadow: 0 2px 4px rgba(0,0,0,0.5), 0 0 15px rgba(0,0,0,0.5);
  font-family: var(--font-brand);
  font-weight: 700;
  line-height: 1.25;
  word-wrap: break-word;
  transition: font-size 120ms ease;
}

/* Dynamic font sizing by response length */
#hero-text[data-length]      { font-size: clamp(1.2rem, 4vw, 3.6rem); }
#hero-text[data-length="xs"] { font-size: clamp(1.2rem, 3.5vw, 3.2rem); }
#hero-text[data-length="sm"] { font-size: clamp(1.1rem, 3.0vw, 2.6rem); }
#hero-text[data-length="md"] { font-size: clamp(1.0rem, 2.4vw, 2.2rem); }
#hero-text[data-length="lg"] { font-size: clamp(1.0rem, 2.0vw, 1.6rem); }
#hero-text[data-length="xl"] { font-size: clamp(0.95rem,1.6vw, 1.35rem); }

#hero-text.standard-response {
  text-align: left;
  font-weight: 400;
  line-height: 1.7;
  font-size: 1.1rem;
  font-family: var(--font-sans);
}
.standard-response h2 {
  font-weight: 800;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
  font-size: 1.6em;
  letter-spacing: -0.01em;
}
.standard-response strong { font-weight: 700; }
.standard-response code {
  background: rgba(255,255,255,0.12);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.9em;
}

/* ── Hero Input Zone ────────────────────────────────────────── */
#hero-input-zone {
  position: absolute;
  bottom: 2.5rem;
  width: 100%;
  max-width: 42rem;
  left: 50%;
  transform: translateX(-50%);
  padding: 0 1rem;
  z-index: 20;
}

.input-wrapper { position: relative; }

.history-panel {
  position: absolute; bottom: 100%;
  left: 0; right: 0;
  max-height: 320px; overflow-y: auto;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(20px) saturate(1.4);
  border-radius: var(--radius);
  padding: 1rem;
  margin-bottom: 0.75rem;
  box-shadow: var(--shadow-xl);
  color: var(--text-muted);
  font-size: 0.9rem;
}
.history-panel[hidden] { display: none; }

.history-turn { margin-bottom: 0.5rem; padding: 0.6rem 0.75rem; border-radius: var(--radius-sm); }
.history-turn.clickable { cursor: pointer; transition: background var(--transition); }
.history-turn.clickable:hover { background: rgba(42,87,154,0.06); }
.history-label { font-weight: 700; text-transform: uppercase; font-size: 0.65rem; letter-spacing: 0.08em; opacity: 0.5; margin-bottom: 0.15rem; }

.input-bar {
  display: flex; align-items: center;
  background: rgba(255,255,255,0.9);
  backdrop-filter: blur(24px) saturate(1.4);
  border-radius: var(--radius-pill);
  box-shadow: 0 8px 40px rgba(0,0,0,0.15), 0 0 0 1px rgba(255,255,255,0.2);
  padding: 0.35rem;
  gap: 0.25rem;
}

.input-bar input {
  flex: 1;
  background: transparent; border: none;
  font-family: inherit; font-size: 0.95rem;
  padding: 0.5rem 0.85rem;
  color: #1a1c1f;
  outline: none;
}
.input-bar input::placeholder { color: #9ca3af; }

/* Icon buttons inside input bar */
.input-icon-btn {
  width: 2.25rem; height: 2.25rem;
  padding: 0; border-radius: 50%;
  border: none;
  background: rgba(0,0,0,0.04);
  color: #6b7280;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.85rem;
  transition: all var(--transition);
}
.input-icon-btn:hover {
  background: rgba(42,87,154,0.1);
  color: var(--accent);
  transform: translateY(-1px);
}
.input-icon-btn:disabled { opacity: 0.3; cursor: not-allowed; transform: none; }

/* ── Scroll Indicator ───────────────────────────────────────── */
.scroll-indicator {
  position: absolute;
  bottom: 1rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 5;
  color: rgba(255,255,255,0.4);
  font-size: 0.9rem;
  animation: bounce 2s infinite;
}
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(6px); }
}

/* ═══════════════════════════════════════════════════════════════
   MARKETING SECTIONS (below the fold)
   ═══════════════════════════════════════════════════════════════ */
#hero-marketing {
  position: relative;
  z-index: 10;
  background: var(--bg);
}

.section { padding: 6rem 0; }
.section-alt { background: var(--bg-alt); }
.section-dark {
  background: linear-gradient(135deg, #0b0f19, #131825);
  color: white;
}

.section-inner {
  max-width: 1100px; margin: 0 auto;
  padding: 0 2rem;
}
.section-narrow { max-width: 56rem; }

.section-header { text-align: center; margin-bottom: 3.5rem; }

.section-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  background: rgba(42,87,154,0.08);
  padding: 0.35rem 1rem;
  border-radius: var(--radius-pill);
  margin-bottom: 1rem;
}
.section-tag-light {
  color: #93c5fd;
  background: rgba(147,197,253,0.12);
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  color: var(--text);
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}
.section-dark .section-title { color: #fff; }

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 36rem;
  margin: 0 auto;
  line-height: 1.6;
}

/* ── Service Cards ──────────────────────────────────────────── */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.service-card {
  position: relative;
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 2rem;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition-slow);
  overflow: hidden;
}
.service-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  opacity: 0;
  transition: opacity var(--transition-slow);
}
.service-card:hover, .service-card:focus-visible {
  border-color: rgba(42,87,154,0.2);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}
.service-card:hover::before { opacity: 1; }

.service-icon {
  width: 3rem; height: 3rem;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(42,87,154,0.08), rgba(42,87,154,0.04));
  display: flex; align-items: center; justify-content: center;
  color: var(--accent);
  font-size: 1.2rem;
  margin-bottom: 1.25rem;
}

.card-title {
  font-size: 1.1rem; font-weight: 700;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.card-text {
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.7;
}

.card-arrow {
  display: inline-flex;
  align-items: center;
  color: var(--accent);
  font-size: 0.85rem;
  margin-top: 1rem;
  opacity: 0;
  transform: translateX(-8px);
  transition: all var(--transition-slow);
}
.service-card:hover .card-arrow {
  opacity: 1;
  transform: translateX(0);
}

/* ── Certification Badges ───────────────────────────────────── */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  max-width: 56rem;
  margin: 0 auto;
  text-align: center;
}

.cert-badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 1.25rem 1rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-muted);
  text-align: center;
}
.cert-badge i {
  color: var(--accent);
  font-size: 1rem;
  flex-shrink: 0;
}
.cert-badge:hover, .cert-badge:focus-visible {
  border-color: rgba(42,87,154,0.25);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
  color: var(--text);
}

/* ── About Section ──────────────────────────────────────────── */
.about-text {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--text-muted);
  text-align: center;
  margin-bottom: 3rem;
}

.about-tech { margin-top: 2rem; }

.tech-badge {
  display: flex;
  gap: 1.25rem;
  padding: 1.5rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.tech-badge > i {
  color: var(--accent);
  font-size: 1.5rem;
  flex-shrink: 0;
  margin-top: 0.15rem;
}
.tech-badge h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.5rem;
}
.tech-badge p {
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.7;
}

/* ── Contact Section ────────────────────────────────────────── */
.text-center { text-align: center; }

.contact-title {
  font-size: clamp(1.6rem, 3vw, 2.25rem);
  font-weight: 800;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.contact-subtitle {
  font-size: 1.1rem;
  color: #94a3b8;
  max-width: 36rem;
  margin: 0 auto 2.5rem;
  line-height: 1.6;
}

.contact-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: white;
  font-weight: 600;
  font-size: 1.05rem;
  padding: 1rem 2rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  box-shadow: var(--shadow-btn);
  transition: all var(--transition);
  border: none;
  cursor: pointer;
  font-family: inherit;
}
.contact-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(42,87,154,0.45);
}

/* Footer */
.footer {
  background: var(--bg);
  padding: 1.5rem;
  border-top: 1px solid var(--border);
  text-align: center;
}
.footer-text { color: var(--text-subtle); font-size: 0.82rem; }


/* ═══════════════════════════════════════════════════════════════
   CHAT MODE
   ═══════════════════════════════════════════════════════════════ */

/* ── Chat Header ────────────────────────────────────────────── */
.chat-header {
  display: flex; align-items: center;
  justify-content: space-between;
  padding: 1.25rem 2rem 0.5rem;
}
.chat-agent-name {
  font-size: clamp(1.3rem, 2.5vw, 1.9rem);
  font-weight: 800; letter-spacing: -0.01em;
}
.chat-header-controls { display: flex; gap: 0.5rem; align-items: center; }
.chat-version {
  font-size: 0.65rem;
  color: var(--text-subtle);
  opacity: 0.5;
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}
.theme-toggle {
  background: transparent; border: none;
  font-size: 1.1rem; cursor: pointer;
  padding: 0.5rem;
  border-radius: var(--radius-pill);
  color: var(--text-muted);
  transition: all var(--transition);
}
.theme-toggle:hover, .theme-toggle:focus-visible {
  background: rgba(42,87,154,0.08);
  color: var(--accent);
  outline: none;
}

/* ── Progress Bar (Aura 10-question flow) ──────────────────── */
.chat-progress {
  padding: 0.5rem 2rem;
  display: flex; align-items: center; gap: 0.75rem;
}
.chat-progress[hidden] { display: none; }
.progress-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  white-space: nowrap;
  min-width: 110px;
}
.progress-track {
  flex: 1;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  border-radius: 3px;
  transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Chat Main ──────────────────────────────────────────────── */
.chat-main {
  flex: 1; display: flex; flex-direction: column;
  padding: 0 2rem 1.5rem;
  min-height: 0;
}

#chat-layout {
  min-height: 100vh;
  display: flex; flex-direction: column;
  background: var(--bg);
  color: var(--text);
}

.chat-container {
  flex: 1; display: flex; flex-direction: column;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  padding: 1.5rem;
  min-height: 0;
  overflow: hidden;
  transition: background var(--transition-slow), border var(--transition-slow);
}

.chat-messages {
  flex: 1; overflow-y: auto;
  display: flex; flex-direction: column;
  gap: 0.75rem;
  padding-right: 0.25rem;
  min-height: 200px;
}

/* Message bubbles */
.message {
  max-width: min(780px, 95%);
  width: fit-content;
  min-width: min(600px, 85%);
  padding: 1rem 1.25rem;
  border-radius: 18px;
  line-height: 1.6;
  font-size: 0.95rem;
}
.message.user {
  align-self: flex-end;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #f9fafb;
  border-bottom-right-radius: 4px;
  box-shadow: 0 4px 12px rgba(42,87,154,0.2);
  min-width: auto;
  max-width: min(600px, 80%);
}
.message.agent {
  align-self: flex-start;
  background: var(--bg-alt);
  color: var(--text);
  border-bottom-left-radius: 4px;
  border: 1px solid var(--border);
  width: min(780px, 95%);
}
body.dark .message.agent {
  background: rgba(42,87,154,0.12);
  border-color: rgba(42,87,154,0.2);
}
.message .meta {
  font-size: 0.68rem; opacity: 0.5;
  text-transform: uppercase; letter-spacing: 0.08em;
  margin-bottom: 0.35rem;
  font-weight: 600;
}

/* ── Chat Composer ──────────────────────────────────────────── */
.chat-composer {
  display: flex; gap: 0.75rem; align-items: flex-end;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  margin-top: 1rem;
}
.chat-composer textarea {
  flex: 1; resize: none;
  min-height: 3rem; max-height: 12rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  font-family: inherit; font-size: 0.95rem; line-height: 1.5;
  background: var(--bg);
  color: inherit;
  transition: border var(--transition), box-shadow var(--transition);
}
body.dark .chat-composer textarea {
  background: var(--bg-dark);
  border-color: rgba(255,255,255,0.08);
}
.chat-composer textarea:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(42,87,154,0.15);
  border-color: rgba(42,87,154,0.5);
}

/* ── Chat Status + Actions ──────────────────────────────────── */
.chat-status {
  min-height: 1.5rem;
  font-size: 0.85rem;
  color: var(--text-subtle);
  margin-top: 0.5rem;
}
body.dark .chat-status { color: var(--accent-soft); }

.chat-actions {
  display: flex; gap: 0.75rem; flex-wrap: wrap;
  justify-content: flex-end;
  padding: 0 2rem 1.5rem;
}
.download-link {
  margin-left: auto;
  text-decoration: none; font-weight: 600;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
}
body.dark .download-link { color: var(--accent-soft); }


/* ═══════════════════════════════════════════════════════════════
   AGENT REDIRECT BANNER
   ═══════════════════════════════════════════════════════════════ */
.redirect-banner {
  position: fixed; bottom: 1.5rem; left: 50%;
  transform: translateX(-50%);
  width: min(520px, calc(100vw - 2rem));
  background: var(--bg);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow-xl);
  z-index: 200;
  display: flex; flex-direction: column; gap: 1rem;
}
.redirect-banner[hidden] { display: none; }
body.dark .redirect-banner {
  background: var(--bg-dark-alt);
  border-color: var(--border-dark);
}
.redirect-message { font-size: 0.95rem; color: var(--text-muted); }
.redirect-actions { display: flex; gap: 0.75rem; flex-wrap: wrap; }


/* ═══════════════════════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════════════════════ */
@media (max-width: 767px) {
  .chat-main   { padding: 0 1rem 1rem; }
  .chat-header { padding: 1rem 1rem 0.25rem; }
  .chat-container { padding: 1rem; border-radius: var(--radius); }
  .chat-composer { flex-direction: column; align-items: stretch; }
  .chat-actions  { padding: 0 1rem 1rem; justify-content: center; }

  .section { padding: 4rem 0; }
  .section-inner { padding: 0 1.25rem; }

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

  #hero-input-zone { padding-bottom: 2rem; }
  .scroll-indicator { display: none; }
}

@media (max-width: 480px) {
  .cert-grid { grid-template-columns: 1fr; }
}

/* ── Tables inside chat messages ───────────────────────── */
.message .content table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0;
  font-size: 0.9rem;
  table-layout: auto;
}
.message .content th,
.message .content td {
  padding: 8px 12px;
  border: 1px solid rgba(0, 0, 0, 0.1);
  text-align: left;
  vertical-align: top;
  word-break: normal;
  overflow-wrap: normal;
}
.message .content th {
  background: #f0f4f8;
  color: #1a1a2e;
  font-weight: 600;
  white-space: nowrap;
}
.message .content td:first-child {
  white-space: nowrap;
  font-weight: 500;
  min-width: 180px;
  max-width: 220px;
}
.message .content table tr:hover td {
  background: rgba(42, 87, 154, 0.03);
}

/* Dark mode tables */
body.dark .message .content th {
  background: rgba(42, 87, 154, 0.25);
  color: #e2e8f0;
  border-color: rgba(255, 255, 255, 0.1);
}
body.dark .message .content td {
  color: #d1d5db;
  border-color: rgba(255, 255, 255, 0.08);
}
body.dark .message .content table tr:hover td {
  background: rgba(42, 87, 154, 0.1);
}

/* Ensure content div allows tables to overflow horizontally if needed */
.message .content {
  white-space: normal;
  word-break: break-word;
  overflow-x: auto;
}

/* ── BRD content inside chat messages ──────────────────── */
/* Headings inside agent messages */
.message.agent .content h1 {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 1.25rem 0 0.5rem;
  color: var(--text);
  border-bottom: 2px solid var(--accent);
  padding-bottom: 0.35rem;
}
.message.agent .content h2 {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 1.1rem 0 0.4rem;
  color: var(--accent);
  border-bottom: 1px solid rgba(42, 87, 154, 0.2);
  padding-bottom: 0.25rem;
}
.message.agent .content h3 {
  font-size: 1rem;
  font-weight: 600;
  margin: 0.9rem 0 0.3rem;
  color: var(--text);
}
body.dark .message.agent .content h1 { color: #f0f2f5; }
body.dark .message.agent .content h2 { color: #93bbef; border-color: rgba(147, 187, 239, 0.25); }
body.dark .message.agent .content h3 { color: #d1d5db; }

/* Lists inside agent messages */
.message.agent .content ul,
.message.agent .content ol {
  padding-left: 1.5rem;
  margin: 0.5rem 0;
}
.message.agent .content li {
  margin: 0.25rem 0;
  line-height: 1.5;
}

/* Paragraphs inside agent messages */
.message.agent .content p {
  margin: 0.5rem 0;
  line-height: 1.6;
}

/* Code inside agent messages */
.message.agent .content code {
  background: rgba(42, 87, 154, 0.08);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.88em;
}
body.dark .message.agent .content code {
  background: rgba(147, 187, 239, 0.12);
  color: #93bbef;
}
.message.agent .content pre {
  background: #1e293b;
  color: #e2e8f0;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.5;
  margin: 0.75rem 0;
}
.message.agent .content pre code {
  background: transparent;
  padding: 0;
  color: inherit;
}

/* Strong/emphasis in dark mode */
body.dark .message.agent .content strong { color: #f0f2f5; }
body.dark .message.agent .content em { color: #d1d5db; }

/* Links inside agent messages */
.message.agent .content a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}
body.dark .message.agent .content a { color: #93bbef; }

/* ── BRD Download Button ──────────────────────────────── */
.brd-download-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.6rem 1.2rem;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: var(--shadow);
}
.brd-download-btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}
.brd-download-btn:active {
  transform: translateY(0);
}
.brd-actions p { margin: 0.5rem 0; }