:root {
  --bg-main: #090d16;
  --bg-surface: #0f172a;
  --bg-card: rgba(18, 26, 44, 0.7);
  --bg-card-hover: rgba(28, 39, 66, 0.85);
  --border-glass: rgba(255, 255, 255, 0.08);
  --border-glass-glow: rgba(99, 102, 241, 0.3);
  --accent-primary: #6366f1;
  --accent-primary-hover: #4f46e5;
  --accent-cyan: #06b6d4;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-faint: #64748b;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  --shadow-lg: 0 20px 40px -15px rgba(0, 0, 0, 0.7);
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

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

html {
  scroll-behavior: smooth;
  color-scheme: dark;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(99, 102, 241, 0.12) 0%, transparent 40%),
    radial-gradient(circle at 85% 30%, rgba(6, 182, 212, 0.1) 0%, transparent 45%),
    radial-gradient(circle at 50% 85%, rgba(139, 92, 246, 0.08) 0%, transparent 50%);
  background-attachment: fixed;
}

/* Typography & Utilities */
h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: #fff;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  background: rgba(99, 102, 241, 0.15);
  color: #a5b4fc;
  border: 1px solid rgba(99, 102, 241, 0.3);
}

.badge-pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 10px #10b981;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.2); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(9, 13, 22, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-glass);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.25rem;
  font-weight: 800;
  color: #fff;
}

.brand-icon {
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-cyan));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 15px rgba(99, 102, 241, 0.5);
}

.brand-icon svg {
  width: 20px;
  height: 20px;
  fill: #fff;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.2s ease;
}

.nav-link:hover {
  color: #fff;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-primary), #4338ca);
  color: #fff;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #4f46e5, #3730a3);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: #fff;
  border: 1px solid var(--border-glass);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

.btn-login {
  background: rgba(99, 102, 241, 0.15);
  color: #c7d2fe;
  border: 1px solid rgba(99, 102, 241, 0.3);
}

.btn-login:hover {
  background: rgba(99, 102, 241, 0.25);
  color: #fff;
  border-color: var(--accent-primary);
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1.05rem;
}

/* Mobile Nav Toggle */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: #fff;
  cursor: pointer;
  padding: 8px;
}

/* Hero Section */
.hero {
  padding: 80px 0 60px;
  text-align: center;
  position: relative;
}

.hero-content {
  max-width: 880px;
  margin: 0 auto;
}

.hero-title {
  font-size: clamp(2.4rem, 5vw, 4rem);
  margin: 20px 0;
  letter-spacing: -0.03em;
}

.gradient-text {
  background: linear-gradient(135deg, #ffffff 30%, #818cf8 70%, #38bdf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-sub {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 720px;
  margin: 0 auto 36px;
  font-weight: 400;
}

.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.hero-badges {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--text-faint);
}

.hero-badges span {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Interactive Simulator Showcase */
.showcase-wrapper {
  margin: 40px auto 0;
  max-width: 1040px;
  background: var(--bg-surface);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg), 0 0 50px rgba(99, 102, 241, 0.15);
  overflow: hidden;
}

.showcase-header {
  background: rgba(15, 23, 42, 0.95);
  border-bottom: 1px solid var(--border-glass);
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.window-dots {
  display: flex;
  gap: 6px;
}

.dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}
.dot.red { background: #ef4444; }
.dot.yellow { background: #f59e0b; }
.dot.green { background: #10b981; }

.room-title-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
}

.room-badge {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.3);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
}

.showcase-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 480px;
}

.seats-panel {
  background: rgba(11, 17, 32, 0.7);
  border-right: 1px solid var(--border-glass);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.seats-heading {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-faint);
  font-weight: 700;
  margin-bottom: 4px;
}

.seat-card {
  padding: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
  cursor: pointer;
}

.seat-card:hover, .seat-card.active {
  border-color: var(--accent-primary);
  background: var(--bg-card-hover);
}

.seat-top {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
}

.avatar {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.8rem;
  color: #fff;
}

.seat-info h4 {
  font-size: 0.85rem;
  font-weight: 600;
}

.seat-info .role-tag {
  font-size: 0.7rem;
  color: var(--text-muted);
}

.seat-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.7rem;
  margin-top: 6px;
  padding-top: 6px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.provider-tag {
  font-family: var(--font-mono);
  color: var(--accent-cyan);
}

.status-tag {
  color: var(--accent-emerald);
}

/* Dialogue Panel */
.dialogue-panel {
  display: flex;
  flex-direction: column;
  background: rgba(15, 23, 42, 0.5);
}

.dialogue-stream {
  flex: 1;
  padding: 20px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-height: 420px;
}

.msg-item {
  display: flex;
  gap: 14px;
  max-width: 90%;
  animation: fadeIn 0.3s ease;
}

.msg-founder {
  align-self: flex-end;
  flex-direction: row-reverse;
}

.msg-bubble {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  padding: 14px 18px;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
}

.msg-founder .msg-bubble {
  background: rgba(99, 102, 241, 0.2);
  border-color: rgba(99, 102, 241, 0.4);
}

.msg-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
  font-size: 0.75rem;
}

.msg-author {
  font-weight: 700;
  color: #fff;
}

.msg-llm {
  font-family: var(--font-mono);
  background: rgba(255, 255, 255, 0.08);
  padding: 1px 6px;
  border-radius: 4px;
  color: #38bdf8;
}

.dialogue-footer {
  border-top: 1px solid var(--border-glass);
  padding: 14px 20px;
  background: rgba(11, 17, 32, 0.9);
  display: flex;
  align-items: center;
  gap: 12px;
}

.sim-input {
  flex: 1;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 10px 16px;
  color: #fff;
  font-size: 0.9rem;
}

.sim-input:focus {
  outline: none;
  border-color: var(--accent-primary);
}

/* Sections General */
.section {
  padding: 90px 0;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 60px;
}

.section-title {
  font-size: 2.2rem;
  margin: 12px 0 16px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
}

/* Use Cases Selector */
.use-cases-tabs {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.tab-btn {
  padding: 10px 20px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-full);
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.tab-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
}

.tab-btn.active {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: #fff;
  box-shadow: 0 0 15px rgba(99, 102, 241, 0.4);
}

.use-case-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 36px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.uc-details h3 {
  font-size: 1.8rem;
  margin-bottom: 14px;
}

.uc-details p {
  color: var(--text-muted);
  margin-bottom: 20px;
  font-size: 1rem;
}

.uc-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}

.uc-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.95rem;
  color: #e2e8f0;
}

.uc-features svg {
  width: 18px;
  height: 18px;
  fill: var(--accent-emerald);
  flex-shrink: 0;
  margin-top: 2px;
}

.uc-board-preview {
  background: rgba(11, 17, 32, 0.8);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 24px;
}

.uc-board-preview h4 {
  font-size: 0.85rem;
  color: var(--text-faint);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

.roster-grid {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.roster-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.04);
}

.roster-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.roster-llm {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-cyan);
}

/* Four Pillars Grid */
.pillars-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.pillar-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  position: relative;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.pillar-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-glass-glow);
}

.pillar-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

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

.pi-purple { background: rgba(99, 102, 241, 0.15); fill: #818cf8; }
.pi-cyan { background: rgba(6, 182, 212, 0.15); fill: #38bdf8; }
.pi-emerald { background: rgba(16, 185, 129, 0.15); fill: #34d399; }
.pi-amber { background: rgba(245, 158, 11, 0.15); fill: #fbbf24; }

.pillar-card h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
}

.pillar-card p {
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.6;
}

/* Ingestion Pipeline / Pre-App Section */
.pipeline-box {
  background: linear-gradient(180deg, rgba(15, 23, 42, 0.8), rgba(9, 13, 22, 0.9));
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 40px;
}

.flow-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  position: relative;
  margin-top: 30px;
}

.flow-step {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 24px;
  position: relative;
}

.step-num {
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--accent-primary);
  font-weight: 700;
  margin-bottom: 10px;
}

.flow-step h4 {
  font-size: 1.05rem;
  margin-bottom: 8px;
}

.flow-step p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Call to Action Banner */
.cta-banner {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.2), rgba(6, 182, 212, 0.15));
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-banner h2 {
  font-size: 2.4rem;
  margin-bottom: 16px;
}

.cta-banner p {
  font-size: 1.15rem;
  color: #cbd5e1;
  max-width: 640px;
  margin: 0 auto 32px;
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-overlay.active {
  display: flex;
  animation: fadeIn 0.2s ease;
}

.modal-dialog {
  background: var(--bg-surface);
  border: 1px solid var(--border-glass-glow);
  border-radius: var(--radius-lg);
  max-width: 440px;
  width: 100%;
  padding: 32px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.8);
  position: relative;
}

.modal-close {
  position: absolute;
  top: 20px;
  right: 20px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  line-height: 1;
}

.modal-close:hover {
  color: #fff;
}

.modal-header {
  text-align: center;
  margin-bottom: 24px;
}

.modal-header h3 {
  font-size: 1.5rem;
  margin-bottom: 6px;
}

.modal-header p {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.modal-tabs {
  display: flex;
  gap: 4px;
  background: rgba(0, 0, 0, 0.3);
  padding: 4px;
  border-radius: var(--radius-md);
  margin-bottom: 20px;
}

.modal-tab {
  flex: 1;
  padding: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all 0.2s;
}

.modal-tab.active {
  background: var(--bg-card);
  color: #fff;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 6px;
  color: #cbd5e1;
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  color: #fff;
  font-size: 0.92rem;
}

.form-control:focus {
  outline: none;
  border-color: var(--accent-primary);
}

.form-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.form-check {
  display: flex;
  align-items: center;
  gap: 6px;
}

.vercel-notice {
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.25);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font-size: 0.78rem;
  color: #c7d2fe;
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.vercel-notice a {
  color: var(--accent-cyan);
  text-decoration: underline;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-glass);
  padding: 50px 0 30px;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-col h5 {
  font-size: 0.95rem;
  color: #fff;
  margin-bottom: 16px;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col a:hover {
  color: #fff;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 24px;
  font-size: 0.8rem;
  color: var(--text-faint);
  flex-wrap: wrap;
  gap: 12px;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Responsive */
@media (max-width: 900px) {
  .showcase-grid {
    grid-template-columns: 1fr;
  }
  .use-case-card {
    grid-template-columns: 1fr;
  }
  .flow-steps {
    grid-template-columns: 1fr 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .nav-links {
    display: none;
  }
  .mobile-toggle {
    display: block;
  }
  .flow-steps {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
}