/* ===== CSS Variables — Forensic Dark Theme ===== */
:root {
  --color-bg: #0d1117;
  --color-surface: #161b22;
  --color-surface-alt: #1c2128;
  --color-surface-raised: #21262d;
  --color-border: #30363d;
  --color-border-hover: #484f58;
  --color-text: #e6edf3;
  --color-text-secondary: #8b949e;
  --color-text-muted: #6e7681;
  --color-accent: #58a6ff;
  --color-accent-hover: #79c0ff;
  --color-accent-subtle: rgba(88, 166, 255, 0.15);
  --color-accent-subtle-border: rgba(88, 166, 255, 0.3);
  --color-success: #3fb950;
  --color-warning: #d29922;
  --color-danger: #f85149;
  --color-danger-subtle: #490202;
  --color-tag-problem: #3d1214;
  --color-tag-solution: #0d2b1a;
  --radius: 8px;
  --radius-sm: 6px;
  --font-sans: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Fira Code", "Cascadia Code", monospace;
  --transition: 160ms ease;
}

/* ===== 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(--color-bg);
  color: var(--color-text);
  line-height: 1.65;
  min-height: 100vh;
}

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

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

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

code {
  font-family: var(--font-mono);
  background: var(--color-surface-raised);
  padding: 2px 7px;
  border-radius: 4px;
  font-size: 0.85em;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

/* ===== Container ===== */
.container {
  width: 100%;
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 28px;
}

/* ===== Navbar ===== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 17, 23, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  gap: 16px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 9px;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-text);
  letter-spacing: -0.02em;
  font-family: var(--font-mono);
}

.logo-icon {
  font-size: 1.3rem;
  line-height: 1;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
  list-style: none;
}

.nav-links a {
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  font-weight: 500;
  transition: color var(--transition);
}

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

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  font-size: 0.88rem;
  font-family: inherit;
}

.btn-primary {
  background: var(--color-accent);
  color: #0d1117;
  border-color: var(--color-accent);
}

.btn-primary:hover {
  color: #0d1117;
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--color-surface-raised);
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-surface-alt);
  border-color: var(--color-border-hover);
}

a[href="#signup"].btn-secondary {
  border-color: var(--color-accent);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.82rem;
}

.btn-lg {
  padding: 14px 28px;
  font-size: 0.95rem;
  border-radius: 8px;
}

.btn-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

/* ===== Hero ===== */
.hero {
  padding: 80px 0 56px;
  text-align: center;
}

/* ===== Regression Timeline SVG ===== */
.timeline-container {
  max-width: 720px;
  margin: 0 auto 32px;
  background: #0d1117;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.regression-timeline {
  display: block;
  width: 100%;
  height: auto;
}

.hero-badge {
  display: inline-block;
  background: var(--color-surface-alt);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 5px 16px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 24px;
  letter-spacing: 0.02em;
  font-family: var(--font-mono);
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 750;
  line-height: 1.12;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
  color: var(--color-text);
}

.hero-subhead {
  font-size: 1.08rem;
  color: var(--color-text-secondary);
  max-width: 620px;
  margin: 0 auto 28px;
  line-height: 1.6;
}

/* ===== Alert Box (Drift Notification) ===== */
.alert-box {
  max-width: 600px;
  margin: 0 auto 32px;
  background: var(--color-danger-subtle);
  border: 1px solid rgba(248, 81, 73, 0.35);
  border-left: 4px solid var(--color-danger);
  border-radius: var(--radius);
  padding: 16px 20px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.6;
}

.alert-box .alert-icon {
  color: var(--color-danger);
  margin-right: 6px;
}

.alert-box .alert-step {
  color: var(--color-accent-hover);
  font-weight: 700;
}

.alert-box .alert-pct {
  color: var(--color-danger);
  font-weight: 700;
}

.alert-box .alert-action {
  display: inline-block;
  margin-top: 8px;
  color: var(--color-accent);
  font-weight: 600;
  font-size: 0.85rem;
}

.alert-box .alert-action:hover {
  color: var(--color-accent-hover);
}

/* ===== Sections ===== */
.section {
  padding: 72px 0;
}

.section-alt {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section-title {
  font-size: 1.45rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 40px;
  letter-spacing: -0.02em;
  color: var(--color-text);
  font-family: var(--font-mono);
}

.section-desc {
  text-align: center;
  max-width: 600px;
  margin: -24px auto 32px;
  color: var(--color-text-secondary);
  font-size: 0.93rem;
  line-height: 1.6;
}

/* ===== Case Study ===== */
.case-study {
  max-width: 720px;
  margin: 0 auto;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px 36px;
}

.case-study h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-text);
}

.case-study blockquote {
  border-left: 3px solid var(--color-accent);
  padding-left: 18px;
  margin: 0;
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  font-style: normal;
}

.case-study blockquote strong {
  color: var(--color-text);
}

.case-study .highlight-saved {
  color: var(--color-success);
  font-weight: 700;
}

/* ===== Two Column ===== */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

/* ===== Cards ===== */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 30px 32px;
}

.card-tag {
  display: inline-block;
  font-weight: 650;
  font-size: 0.76rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: 4px;
  margin-bottom: 16px;
  font-family: var(--font-mono);
}

.card-problem .card-tag {
  background: var(--color-tag-problem);
  color: var(--color-danger);
}

.card-solution .card-tag {
  background: var(--color-tag-solution);
  color: var(--color-success);
}

.card p {
  color: var(--color-text-secondary);
  font-size: 0.98rem;
  line-height: 1.6;
}

/* ===== Features ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 26px 24px;
  transition: border-color var(--transition);
}

.feature-card:hover {
  border-color: var(--color-border-hover);
}

.feature-icon {
  font-size: 1.5rem;
  margin-bottom: 12px;
  line-height: 1;
}

.feature-card h3 {
  font-size: 0.98rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--color-text);
}

.feature-card p {
  color: var(--color-text-secondary);
  font-size: 0.88rem;
}

/* ===== How It Works ===== */
.steps {
  list-style: none;
  counter-reset: step;
  display: grid;
  gap: 20px;
  max-width: 660px;
  margin: 0 auto;
}

.steps li {
  counter-increment: step;
  position: relative;
  padding-left: 50px;
  font-size: 0.96rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.steps li strong {
  color: var(--color-text);
}

.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 1px;
  width: 32px;
  height: 32px;
  background: var(--color-accent-subtle);
  color: var(--color-accent);
  border: 1px solid var(--color-accent-subtle-border);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  font-family: var(--font-mono);
}

/* ===== Code Block ===== */
.code-block {
  max-width: 680px;
  margin: 0 auto 20px;
  background: #0d1117;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow-x: auto;
}

.code-block pre {
  padding: 22px 26px;
  margin: 0;
}

.code-block code {
  background: none;
  border: none;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.7;
  color: #e6edf3;
}

.code-keyword { color: #ff7b72; }
.code-var     { color: #79c0ff; }
.code-str     { color: #a5d6ff; }
.code-num     { color: #d2a8ff; }
.code-comment { color: #6e7681; font-style: italic; }
.code-func    { color: #d2a8ff; }
.code-builtin { color: #ffa657; }

.code-block .code-label {
  display: block;
  padding: 8px 26px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ===== Drift Report Table ===== */
.drift-table-wrap {
  max-width: 700px;
  margin: 0 auto 20px;
  overflow-x: auto;
}

.drift-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.drift-table thead {
  background: var(--color-surface-raised);
}

.drift-table th {
  padding: 10px 14px;
  text-align: left;
  font-weight: 650;
  color: var(--color-text-secondary);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-bottom: 1px solid var(--color-border);
}

.drift-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
}

.drift-table tr:last-child td {
  border-bottom: none;
}

.drift-table .drift-up {
  color: var(--color-danger);
  font-weight: 700;
}

.drift-table .drift-neutral {
  color: var(--color-text-secondary);
}

.drift-table .drift-down {
  color: var(--color-success);
  font-weight: 700;
}

.drift-table .row-danger {
  background: rgba(248, 81, 73, 0.06);
}

/* ===== Provider Chips ===== */
.provider-chips {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 8px;
}

.provider-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  font-family: var(--font-mono);
}

/* ===== Architecture Diagram ===== */
.arch-diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  max-width: 740px;
  margin: 24px auto;
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

.arch-box {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 12px 18px;
  text-align: center;
  color: var(--color-text);
  font-weight: 600;
  white-space: nowrap;
}

.arch-box.highlight {
  border-color: var(--color-accent);
  color: var(--color-accent-hover);
}

.arch-arrow {
  color: var(--color-text-muted);
  font-size: 1.2rem;
  line-height: 1;
}

.arch-arrow.future {
  color: var(--color-warning);
  font-size: 0.72rem;
  font-style: italic;
  border: 1px dashed var(--color-warning);
  border-radius: 4px;
  padding: 4px 10px;
}

/* ===== Cards with Terminal Headers ===== */
.terminal-header {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 16px;
  padding: 8px 14px;
  border-radius: 4px;
  display: inline-block;
}

.terminal-header.green {
  background: rgba(63, 185, 80, 0.12);
  color: var(--color-success);
  border: 1px solid rgba(63, 185, 80, 0.25);
}

.terminal-header.blue {
  background: var(--color-accent-subtle);
  color: var(--color-accent);
  border: 1px solid var(--color-accent-subtle-border);
}

/* ===== Checklist ===== */
.checklist {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 10px;
}

.checklist li {
  position: relative;
  padding-left: 26px;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.5;
}

.checklist li::before {
  content: "\2713";
  position: absolute;
  left: 0;
  top: 0;
  font-weight: 700;
  font-size: 0.88rem;
  color: var(--color-success);
}

/* ===== Signup Form ===== */
.signup-form {
  max-width: 480px;
  margin: 0 auto;
  display: grid;
  gap: 16px;
}

.form-group {
  display: grid;
  gap: 5px;
}

.form-group label {
  font-size: 0.84rem;
  font-weight: 650;
  color: var(--color-text);
}

.form-group label span {
  color: var(--color-accent);
}

.form-group input,
.form-group textarea {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  padding: 10px 14px;
  font-size: 0.9rem;
  font-family: inherit;
  transition: border-color var(--transition);
  width: 100%;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.12);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-text-muted);
}

.signup-form .btn {
  justify-self: start;
}

.form-success {
  color: var(--color-success);
  font-weight: 600;
  text-align: center;
  font-size: 0.92rem;
}

/* ===== Caption ===== */
.caption {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.84rem;
}

/* ===== Demo Page Specific ===== */
.demo-scenario {
  max-width: 680px;
  margin: 0 auto;
}

.demo-step {
  margin-bottom: 36px;
}

.demo-step .step-marker {
  display: inline-block;
  background: var(--color-accent-subtle);
  color: var(--color-accent);
  border: 1px solid var(--color-accent-subtle-border);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.8rem;
  padding: 4px 12px;
  border-radius: 4px;
  margin-bottom: 12px;
}

.demo-step h3 {
  font-size: 1.08rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-text);
}

.demo-step p {
  color: var(--color-text-secondary);
  font-size: 0.93rem;
  line-height: 1.65;
  margin-bottom: 14px;
}

.demo-terminal {
  background: #0d1117;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 16px;
}

.demo-terminal .term-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.term-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.term-dot.red    { background: #f85149; }
.term-dot.yellow { background: #d29922; }
.term-dot.green  { background: #3fb950; }

.term-title {
  margin-left: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-text-muted);
}

.demo-terminal pre {
  padding: 18px 20px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.6;
  color: #e6edf3;
  overflow-x: auto;
}

/* ===== Docs Page Specific ===== */
.docs-section {
  margin-bottom: 44px;
}

.docs-section h2 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--color-text);
  font-family: var(--font-mono);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.docs-section h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-top: 24px;
  margin-bottom: 10px;
  color: var(--color-text);
}

.docs-section p {
  color: var(--color-text-secondary);
  font-size: 0.93rem;
  line-height: 1.65;
  margin-bottom: 12px;
}

.docs-section ul {
  margin: 8px 0 16px 22px;
  color: var(--color-text-secondary);
  font-size: 0.93rem;
  line-height: 1.7;
}

.docs-section ul li {
  margin-bottom: 4px;
}

.docs-section ul li code {
  font-size: 0.85em;
}

.endpoint-tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  margin-right: 8px;
}

.endpoint-tag.get    { background: rgba(63, 185, 80, 0.15); color: var(--color-success); border: 1px solid rgba(63, 185, 80, 0.3); }
.endpoint-tag.post   { background: rgba(88, 166, 255, 0.15); color: var(--color-accent); border: 1px solid rgba(88, 166, 255, 0.3); }

.endpoint-url {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--color-text);
  font-weight: 600;
}

/* ===== Footer ===== */
.footer {
  padding: 28px 0;
  border-top: 1px solid var(--color-border);
  text-align: center;
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

.footer a {
  color: var(--color-text-secondary);
  font-weight: 600;
}

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

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .hero {
    padding: 48px 0 36px;
  }

  .hero h1 {
    font-size: 1.65rem;
  }

  .hero-subhead {
    font-size: 0.95rem;
  }

  .two-col {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 48px 0;
  }

  .section-title {
    font-size: 1.2rem;
    margin-bottom: 28px;
  }

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

  .code-block pre {
    padding: 16px 14px;
  }

  .code-block code {
    font-size: 0.76rem;
  }

  .drift-table {
    font-size: 0.74rem;
  }

  .drift-table th,
  .drift-table td {
    padding: 8px 10px;
  }

  .signup-form .btn {
    width: 100%;
  }

  .arch-diagram {
    flex-direction: column;
    gap: 8px;
  }

  .arch-arrow {
    transform: rotate(90deg);
  }

  .nav-links {
    gap: 12px;
  }

  .case-study {
    padding: 22px 20px;
  }
}