:root {
  --bg: #0a0e17;
  --bg-elevated: #111827;
  --bg-card: #151d2e;
  --border: rgba(255, 255, 255, 0.08);
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent-glow: rgba(59, 130, 246, 0.25);
  --success: #22c55e;
  --warning: #f59e0b;
  --gradient: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 50%, #06b6d4 100%);
  --font: "Inter", system-ui, -apple-system, sans-serif;
  --max-width: 1120px;
  --radius: 12px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

.container {
  width: min(var(--max-width), calc(100% - 2rem));
  margin-inline: auto;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  border-bottom: 1px solid transparent;
  transition: background 0.2s, border-color 0.2s;
}

.header.scrolled {
  background: rgba(10, 14, 23, 0.85);
  backdrop-filter: blur(12px);
  border-color: var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.logo-icon {
  width: 2.25rem;
  height: 2.25rem;
  object-fit: contain;
  filter: drop-shadow(0 0 12px rgba(59, 130, 246, 0.35));
}

.logo-mark {
  width: 2rem;
  height: 2rem;
  border-radius: 8px;
  background: var(--gradient);
  display: grid;
  place-items: center;
  font-size: 0.85rem;
  font-weight: 800;
  color: white;
}

.hero-watermark {
  position: absolute;
  right: -6%;
  top: 8%;
  width: min(480px, 50vw);
  opacity: 0.07;
  pointer-events: none;
  z-index: 0;
  animation: brand-spin 140s linear infinite;
}

.hero-watermark img {
  width: 100%;
  height: auto;
}

@keyframes brand-spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-links {
  display: flex;
  gap: 1.75rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.925rem;
  color: var(--text-muted);
  transition: color 0.15s;
}

.nav-links a:hover {
  color: var(--text);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  border-radius: 8px;
  font-size: 0.925rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent);
  color: white;
  box-shadow: 0 4px 14px var(--accent-glow);
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  background: var(--bg-elevated);
}

.btn-lg {
  padding: 0.875rem 1.75rem;
  font-size: 1rem;
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Hero */
.hero {
  padding: 8rem 0 5rem;
  position: relative;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(59, 130, 246, 0.18), transparent),
    radial-gradient(ellipse 60% 40% at 80% 60%, rgba(139, 92, 246, 0.1), transparent);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.hero-badge span {
  width: 6px;
  height: 6px;
  background: var(--success);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero h1 {
  font-size: clamp(2.25rem, 5vw, 3.25rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
}

.hero h1 .gradient-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 32rem;
  margin-bottom: 2rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.hero-visual {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.5rem;
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.4);
}

.dashboard-preview {
  background: var(--bg-elevated);
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.preview-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.preview-dots {
  display: flex;
  gap: 5px;
}

.preview-dots span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border);
}

.preview-dots span:nth-child(1) { background: #ef4444; }
.preview-dots span:nth-child(2) { background: #f59e0b; }
.preview-dots span:nth-child(3) { background: #22c55e; }

.preview-body {
  padding: 1rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

.table-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem;
}

.table-card .label {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.table-card .status {
  font-size: 0.8rem;
  font-weight: 600;
}

.table-card.occupied .status { color: var(--success); }
.table-card.flagged .status { color: var(--warning); }
.table-card.vacant .status { color: var(--text-muted); }

/* Sections */
section {
  padding: 5rem 0;
}

.section-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.section-desc {
  color: var(--text-muted);
  max-width: 36rem;
  font-size: 1.05rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 3rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: border-color 0.2s, transform 0.2s;
}

.feature-card:hover {
  border-color: rgba(59, 130, 246, 0.3);
  transform: translateY(-2px);
}

.feature-icon {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 8px;
  background: rgba(59, 130, 246, 0.12);
  display: grid;
  place-items: center;
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

.feature-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* How it works */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-top: 3rem;
  counter-reset: step;
}

.step {
  position: relative;
  padding-top: 2.5rem;
}

.step::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  top: 0;
  left: 0;
  width: 2rem;
  height: 2rem;
  background: var(--gradient);
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 0.85rem;
  font-weight: 700;
  color: white;
}

.step h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.step p {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* CTA */
.cta {
  padding: 5rem 0;
}

.cta-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 3.5rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-box::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(59, 130, 246, 0.08), transparent 70%);
  pointer-events: none;
}

.cta-box h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  margin-bottom: 0.75rem;
  position: relative;
}

.cta-box p {
  color: var(--text-muted);
  margin-bottom: 2rem;
  position: relative;
}

.cta-box .btn {
  position: relative;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border);
  padding: 2.5rem 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-copy {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.footer-links a {
  font-size: 0.875rem;
  color: var(--text-muted);
  transition: color 0.15s;
}

.footer-links a:hover {
  color: var(--text);
}

/* Responsive */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .hero-visual {
    order: -1;
  }

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

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

  .nav-links {
    display: none;
  }

  .mobile-toggle {
    display: block;
  }

  .nav.open .nav-links {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 4rem;
    left: 0;
    right: 0;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    padding: 1rem;
    gap: 1rem;
  }
}

@media (max-width: 560px) {
  .steps {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    flex-direction: column;
  }

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

/* Knowledge page */
.knowledge-page .header {
  background: rgba(10, 14, 23, 0.85);
  backdrop-filter: blur(12px);
  border-color: var(--border);
}

.knowledge-main {
  padding: 6rem 0 4rem;
}

.knowledge-hero {
  margin-bottom: 2.5rem;
}

.knowledge-hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 0.75rem;
}

.knowledge-toc {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  padding: 1rem 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 3rem;
}

.knowledge-toc a {
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.15s;
}

.knowledge-toc a:hover {
  color: var(--accent);
}

.knowledge-section {
  margin-bottom: 3rem;
  scroll-margin-top: 6rem;
}

.knowledge-section h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.knowledge-subtitle {
  font-size: 1.125rem;
  font-weight: 600;
  margin: 1.5rem 0 0.75rem;
  color: var(--text-muted);
}

.knowledge-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
  margin-top: 1.25rem;
}

.knowledge-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.knowledge-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.knowledge-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.55;
}

.knowledge-arch {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin: 1.25rem 0;
}

.arch-row {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 1rem;
  padding: 0.875rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.9rem;
}

.arch-label {
  font-weight: 600;
  color: var(--accent);
}

.knowledge-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  margin-top: 1rem;
}

.knowledge-table th,
.knowledge-table td {
  text-align: left;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
}

.knowledge-table th {
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.knowledge-table code {
  font-family: ui-monospace, monospace;
  font-size: 0.8rem;
  background: var(--bg-elevated);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
}

.knowledge-table a {
  color: var(--accent);
}

.knowledge-list {
  list-style: disc;
  padding-left: 1.25rem;
  color: var(--text-muted);
}

.knowledge-list li {
  margin-bottom: 0.5rem;
}

.knowledge-list strong {
  color: var(--text);
}

.knowledge-steps {
  padding-left: 1.25rem;
  color: var(--text-muted);
  margin: 1rem 0;
}

.knowledge-steps li {
  margin-bottom: 0.5rem;
}

.knowledge-steps code,
.knowledge-section p code {
  font-family: ui-monospace, monospace;
  font-size: 0.85em;
  background: var(--bg-elevated);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
}

.knowledge-note {
  margin-top: 1.25rem;
  padding: 1rem 1.25rem;
  background: rgba(59, 130, 246, 0.08);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius);
  font-size: 0.9rem;
  color: var(--text-muted);
}

.knowledge-note strong {
  color: var(--text);
}

.knowledge-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.nav-links a.active {
  color: var(--accent);
}

@media (max-width: 640px) {
  .arch-row {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }

  .knowledge-table {
    display: block;
    overflow-x: auto;
  }

  .schema-rel {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* MongoDB schema section */
.schema-overview {
  margin: 1.5rem 0 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.schema-rel {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.75rem;
  font-size: 0.85rem;
}

.schema-box {
  padding: 0.35rem 0.75rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-family: ui-monospace, monospace;
  font-size: 0.8rem;
  color: var(--accent);
}

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

.schema-collection {
  margin-bottom: 2.5rem;
  scroll-margin-top: 6rem;
}

.schema-collection h3 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.schema-collection h3 code {
  font-size: 1rem;
  background: none;
  padding: 0;
  color: var(--accent);
}

.schema-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.schema-sub {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  margin: 1.25rem 0 0.5rem;
}

.schema-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.75rem;
  font-family: ui-monospace, monospace;
}

/* App tour screenshots */
.app-screenshots {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  margin-top: 1.5rem;
}

.app-screenshot {
  margin: 0;
}

.app-screenshot img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: contain;
  background: var(--bg-elevated);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
  display: block;
}

.app-screenshot figcaption {
  margin-top: 0.75rem;
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.55;
}

.app-screenshot figcaption strong {
  color: var(--text);
}

.app-screenshot a {
  color: var(--accent);
}

.knowledge-note a {
  color: var(--accent);
}

/* Knowledge passcode gate */
.knowledge-locked {
  overflow: hidden;
}

.knowledge-gate[hidden],
#knowledge-content[hidden] {
  display: none !important;
}

.knowledge-gate {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  background:
    radial-gradient(ellipse 80% 60% at 50% -10%, rgba(59, 130, 246, 0.18), transparent),
    var(--bg);
}

.knowledge-gate-card {
  width: min(420px, 100%);
  padding: 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 4px);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.35);
  text-align: center;
}

.knowledge-gate-logo {
  margin-bottom: 1.25rem;
}

.gate-logo-img {
  width: 4.5rem;
  height: 4.5rem;
  object-fit: contain;
  filter: drop-shadow(0 0 24px rgba(59, 130, 246, 0.45));
  animation: brand-pulse 4s ease-in-out infinite;
}

@keyframes brand-pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.04); opacity: 0.92; }
}

.knowledge-gate-card h1 {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.knowledge-gate-card > p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.55;
  margin-bottom: 1.5rem;
}

.knowledge-gate-form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.knowledge-gate-form input {
  width: 100%;
  padding: 0.875rem 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text);
  font-family: ui-monospace, monospace;
  font-size: 1rem;
  letter-spacing: 0.12em;
  text-align: center;
  text-transform: uppercase;
}

.knowledge-gate-form input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.knowledge-gate-form .btn {
  width: 100%;
}

.knowledge-gate-error {
  margin-top: 0.75rem;
  font-size: 0.85rem;
  color: #f87171;
}

.knowledge-gate-back {
  display: inline-block;
  margin-top: 1.25rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  transition: color 0.15s;
}

.knowledge-gate-back:hover {
  color: var(--accent);
}

.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;
}