/* ==========================================
   Sisyphus Academica — Design System
   Inspired by Cursor's brand language
   ========================================== */

/* --- Design Tokens --- */
:root {
  /* Canvas & Surface */
  --canvas: #f7f7f4;
  --canvas-soft: #fafaf7;
  --surface-card: #ffffff;
  --surface-strong: #e6e5e0;

  /* Ink */
  --ink: #26251e;
  --body: #5a5852;
  --body-strong: #26251e;
  --muted: #807d72;
  --muted-soft: #a09c92;

  /* Primary */
  --primary: #d44a00;
  --primary-active: #b83d00;
  --on-primary: #ffffff;

  /* Hairlines */
  --hairline: #e6e5e0;
  --hairline-soft: #efeee8;
  --hairline-strong: #cfcdc4;

  /* Semantic */
  --success: #1f8a65;
  --error: #cf2d56;

  /* Timeline pastels (product signature) */
  --timeline-thinking: #dfa88f;
  --timeline-grep: #9fc9a2;
  --timeline-read: #9fbbe0;
  --timeline-edit: #c0a8dd;
  --timeline-done: #c08532;

  /* Typography — Geist (editorial, not overused) + JetBrains Mono */
  --font-display: 'Geist', 'Inter', system-ui, 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-code: 'JetBrains Mono', 'Fira Code', 'SF Mono', Monaco, monospace;

  /* Spacing */
  --space-xxs: 4px;
  --space-xs: 8px;
  --space-sm: 12px;
  --space-base: 16px;
  --space-md: 20px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-xxl: 48px;
  --space-section: 80px;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-pill: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.5;
  color: var(--body);
  background: var(--canvas);
  min-height: 100vh;
}

/* --- Typography --- */
h1, h2, h3, h4, h5 {
  color: var(--ink);
  font-weight: 400;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(32px, 5vw, 72px);
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-lg);
}

h2 {
  font-size: clamp(24px, 3vw, 36px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-top: var(--space-xxl);
  margin-bottom: var(--space-base);
}

h3 {
  font-size: clamp(20px, 2vw, 26px);
  line-height: 1.25;
  letter-spacing: -0.0125em;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
}

h4 {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-xs);
}

p {
  margin-bottom: var(--space-base);
  max-width: 70ch;
}

a {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-color: var(--hairline-strong);
  transition: text-decoration-color var(--transition-fast);
}

a:hover {
  text-decoration-color: var(--primary);
}

strong {
  font-weight: 600;
  color: var(--ink);
}

/* --- Layout --- */
.top-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--canvas);
  border-bottom: 1px solid var(--hairline);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  font-weight: 500;
  color: var(--ink);
}

.brand-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--primary);
  color: var(--on-primary);
  border-radius: var(--radius-sm);
  font-size: 18px;
  font-weight: 600;
}

.brand-text {
  font-size: 16px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav-link {
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  color: var(--body);
  transition: color var(--transition-fast);
}

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

/* --- Buttons --- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--primary);
  color: var(--on-primary);
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 500;
  line-height: 1;
  padding: 10px 18px;
  height: 40px;
  border-radius: var(--radius-md);
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.btn-primary:hover {
  background: var(--primary-active);
  color: var(--on-primary);
  text-decoration: none;
}

.btn-small {
  padding: 6px 14px;
  height: 32px;
  font-size: 13px;
}

.btn-large {
  padding: 12px 24px;
  height: 48px;
  font-size: 16px;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  background: var(--surface-card);
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 500;
  padding: 10px 18px;
  height: 40px;
  border-radius: var(--radius-md);
  border: 1px solid var(--hairline-strong);
  text-decoration: none;
  cursor: pointer;
  transition: border-color var(--transition-fast);
}

.btn-secondary:hover {
  border-color: var(--muted);
  text-decoration: none;
  color: var(--ink);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--body);
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 500;
  padding: 6px 0;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.btn-ghost:hover {
  color: var(--ink);
  text-decoration: none;
}

.button-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin: var(--space-lg) 0;
}

/* --- Main Content --- */
main {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--space-section) var(--space-lg) var(--space-xxl);
}

/* Hero Section */
.hero {
  text-align: center;
  padding: var(--space-section) 0 var(--space-xl);
}

.hero h1 {
  margin-bottom: var(--space-md);
}

.hero .subhead {
  font-size: 18px;
  color: var(--muted);
  max-width: 640px;
  margin: 0 auto var(--space-lg);
}

.hero .button-group {
  justify-content: center;
}

/* Feature Grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-lg);
  margin: var(--space-xl) 0;
}

.feature-card {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-top: 0;
  margin-bottom: var(--space-xs);
}

.feature-card p {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 0;
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-lg) 0;
  font-size: 14px;
}

thead th {
  text-align: left;
  font-weight: 600;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  padding: var(--space-sm) var(--space-base);
  border-bottom: 2px solid var(--hairline);
}

tbody td {
  padding: var(--space-sm) var(--space-base);
  border-bottom: 1px solid var(--hairline-soft);
  vertical-align: top;
}

tbody tr:last-child td {
  border-bottom: none;
}

/* Code */
code {
  font-family: var(--font-code);
  font-size: 13px;
  background: var(--surface-card);
  padding: 2px 6px;
  border-radius: var(--radius-xs, 4px);
  border: 1px solid var(--hairline-soft);
  color: var(--ink);
}

pre {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: var(--space-md) var(--space-lg);
  overflow-x: auto;
  margin: var(--space-lg) 0;
}

pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 13px;
  line-height: 1.6;
}

/* Inline Demo Block */
.demo-block {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin: var(--space-lg) 0;
}

.demo-block .cmd {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-code);
  font-size: 13px;
  padding: var(--space-xs) 0;
}

.demo-block .cmd .prompt {
  color: var(--muted-soft);
}

.demo-block .cmd .input {
  color: var(--ink);
}

.demo-block .output {
  color: var(--muted);
  font-family: var(--font-code);
  font-size: 13px;
  padding-top: var(--space-xs);
  border-top: 1px solid var(--hairline-soft);
  margin-top: var(--space-xs);
}

/* Info Boxes */
.info-box {
  background: var(--surface-card);
  border-left: 3px solid var(--primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: var(--space-base) var(--space-lg);
  margin: var(--space-lg) 0;
}

.info-box h4 {
  margin-top: 0;
  font-size: 14px;
  font-weight: 600;
}

.info-box p {
  font-size: 14px;
  margin-bottom: 0;
}

/* Lists */
ul, ol {
  margin: var(--space-base) 0;
  padding-left: var(--space-lg);
}

li {
  margin-bottom: var(--space-xs);
}

/* --- Architecture Diagram --- */
.arch-diagram {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin: var(--space-lg) 0;
  font-family: var(--font-code);
  font-size: 12px;
  line-height: 1.5;
  overflow-x: auto;
  white-space: pre;
}

.arch-diagram .highlight {
  color: var(--primary);
}

/* Quality Gates */
.gate-list {
  display: grid;
  gap: var(--space-sm);
  margin: var(--space-lg) 0;
}

.gate-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-base);
  background: var(--surface-card);
  border: 1px solid var(--hairline-soft);
  border-radius: var(--radius-md);
  font-size: 14px;
}

.gate-item .num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  min-width: 24px;
  background: var(--primary);
  color: var(--on-primary);
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 600;
}

/* Timeline (agent stages) */
.timeline {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin: var(--space-lg) 0;
}

.timeline-pill {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  color: var(--ink);
}

.pill-thinking { background: var(--timeline-thinking); }
.pill-grep { background: var(--timeline-grep); }
.pill-read { background: var(--timeline-read); }
.pill-edit { background: var(--timeline-edit); }
.pill-done { background: var(--timeline-done); color: var(--on-primary); }

/* --- Noveltly Engine Cards --- */
.engine-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-lg);
  margin: var(--space-xl) 0;
}

.engine-card {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}

.engine-card .engine-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--surface-strong);
  border-radius: var(--radius-pill);
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: var(--space-sm);
}

.engine-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-top: 0;
  margin-bottom: var(--space-xs);
}

.engine-card .tagline {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: var(--space-sm);
}

.engine-card p {
  font-size: 13px;
  margin-bottom: 0;
}

/* --- Comparison Table (hero section) --- */
.comparison-wrap {
  overflow-x: auto;
  margin: var(--space-xl) 0;
}

/* --- Section Spacing --- */
.section {
  margin: var(--space-section) 0;
}

.section-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted-soft);
  margin-bottom: var(--space-base);
}

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--hairline);
  background: var(--canvas);
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-xxl) var(--space-lg);
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: var(--space-xl);
}

.footer-col h4 {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin-top: 0;
  margin-bottom: var(--space-sm);
}

.footer-col a {
  display: block;
  font-size: 14px;
  color: var(--body);
  text-decoration: none;
  padding: var(--space-xxs) 0;
  transition: color var(--transition-fast);
}

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

.footer-col .caption {
  font-size: 13px;
  color: var(--muted-soft);
  margin-bottom: var(--space-xs);
}

/* -- Responsive --- */
@media (max-width: 768px) {
  .nav-links .nav-link:not(.btn-primary) {
    display: none;
  }

  main {
    padding: var(--space-xl) var(--space-base) var(--space-xxl);
  }

  .feature-grid,
  .engine-grid {
    grid-template-columns: 1fr;
  }

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

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

  .hero .button-group {
    flex-direction: column;
    align-items: stretch;
  }
}

/* --- Proof Bar --- */
.proof-bar {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-base);
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  font-size: 13px;
  color: var(--muted);
  margin: var(--space-lg) 0;
  flex-wrap: wrap;
}

.proof-badge {
  background: var(--surface-strong);
  color: var(--ink);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
}

.proof-link {
  font-size: 13px;
}

/* --- Quality Gates (updated) --- */
.gate-list {
  display: grid;
  gap: var(--space-sm);
  margin: var(--space-lg) 0;
}

.gate-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-base);
  padding: var(--space-base) var(--space-lg);
  background: var(--surface-card);
  border: 1px solid var(--hairline-soft);
  border-radius: var(--radius-md);
  font-size: 14px;
  line-height: 1.5;
}

.gate-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  min-width: 28px;
  background: var(--success);
  color: var(--on-primary);
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 700;
}

.gate-item strong {
  color: var(--ink);
}

/* --- Architecture Diagram (responsive) --- */
.arch-wrapper {
  margin: var(--space-lg) 0;
}

.arch-diagram {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  font-family: var(--font-code);
  font-size: 11px;
  line-height: 1.4;
  overflow-x: auto;
  white-space: pre;
}

@media (max-width: 640px) {
  .arch-diagram {
    font-size: 8px;
    padding: var(--space-sm);
  }
}

/* --- Tab containers --- */
.install-tabs {
  margin: var(--space-lg) 0;
}

.tab-content .demo-block {
  margin: var(--space-sm) 0;
}

.demo-label {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin: var(--space-lg) 0 var(--space-xs) 0;
}

/* --- Dark Mode --- */
@media (prefers-color-scheme: dark) {
  :root {
    --canvas: #1a1a18;
    --canvas-soft: #22221e;
    --surface-card: #2a2a26;
    --surface-strong: #3a3a36;
    --ink: #e8e6e0;
    --body: #b0aea8;
    --body-strong: #e8e6e0;
    --muted: #8a8882;
    --muted-soft: #6a6862;
    --hairline: #3a3a36;
    --hairline-soft: #32322e;
    --hairline-strong: #4a4a46;
    --primary: #f06a10;
    --primary-active: #d85a00;
    --on-primary: #0a0a08;
    --success: #2aac78;
    --timeline-thinking: #7a5840;
    --timeline-grep: #3a6a3e;
    --timeline-read: #3a5a80;
    --timeline-edit: #5a4870;
    --timeline-done: #a07a2a;
  }
}

/* --- Utility --- */
.mono {
  font-family: var(--font-code);
  font-size: 13px;
}

.muted {
  color: var(--muted);
}

.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mt-xxl { margin-top: var(--space-xxl); }
.mb-lg { margin-bottom: var(--space-lg); }

/* --- Highlighting (rouge) --- */
.highlight { background: transparent; }
.highlight .c1 { color: var(--muted-soft); font-style: italic; }
.highlight .k { color: var(--primary); font-weight: 500; }
.highlight .s { color: var(--success); }
.highlight .mi { color: var(--timeline-read); }
.highlight .nf { color: var(--ink); }
.highlight .nc { color: var(--timeline-edit); }