/* ── AutoChecklist Homepage ── */
/* Warm paper palette + UChicago Maroon, matching package UI */

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

/* ── Custom Properties ── */
:root {
  --accent: #800000;
  --accent-hover: #600000;
  --accent-light: #FDF2F2;
  --accent-transparent: rgba(128, 0, 0, 0.08);

  --bg: #ffffff;
  --bg-warm: #f5f0eb;
  --surface: #ffffff;
  --surface-manila: #eeeeee;

  --text: #1a1a1e;
  --text-secondary: #52525b;
  --text-muted: #8a8a8f;

  --border: rgba(0, 0, 0, 0.08);
  --border-strong: rgba(0, 0, 0, 0.14);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.08);
  --shadow-card-hover: 0 8px 24px rgba(128, 0, 0, 0.08);

  --radius: 8px;
  --radius-lg: 12px;

  --font-body: 'Inconsolata', monospace;
  --font-mono: 'Space Mono', monospace;

  --max-width: 1080px;
  --section-gap: 3.5rem;
}

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

body {
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--text);
  background-color: var(--bg);
  min-height: 100vh;
}

/* ── Layout ── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
  position: relative;
  z-index: 1;
}

section {
  padding: var(--section-gap) 0;
}

/* ── Section Labels ── */
.section-label {
  font-family: var(--font-body);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--accent);
  margin-bottom: 0.4rem;
}

.section-title {
  font-family: var(--font-body);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 600px;
}

.section-header {
  margin-bottom: 1.5rem;
}

.section-header--center {
  text-align: center;
}

.section-header--center .section-subtitle {
  margin-inline: auto;
}

/* ── Nav ── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--surface-manila);
  border-bottom: 1px solid rgba(26, 26, 30, 0.12);
  padding: 0.75rem 0;
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  opacity: 0.9;
  transition: opacity 0.2s;
}

.nav-brand:hover {
  opacity: 1;
}

.nav-brand-icon {
  height: 36px;
  width: 36px;
}

.nav-brand-text {
  font-family: var(--font-body);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.02em;
  line-height: 1;
}

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

.nav-links a {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}

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

/* ── Hero ── */
.hero {
  padding: 2rem 0 2.5rem;
  text-align: center;
}

.hero-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.hero-logo-icon {
  height: 72px;
  width: 72px;
}

.hero-logo-text {
  font-family: var(--font-body);
  font-size: 3rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.03em;
}

.hero-tagline {
  font-family: var(--font-body);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--accent);
  margin-bottom: 0.75rem;
  max-width: 640px;
  margin-inline: auto;
}

.hero-description {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin-inline: auto;
  margin-bottom: 1.5rem;
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  gap: 0.875rem;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.hero-badge-dot {
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  padding: 0.7rem 1.5rem;
  border-radius: var(--radius);
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 2px 8px rgba(128, 0, 0, 0.2);
}

.btn-primary:hover {
  background: var(--accent-hover);
  box-shadow: 0 4px 12px rgba(128, 0, 0, 0.25);
  transform: translateY(-1px);
}

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

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
}

.btn-icon {
  width: 16px;
  height: 16px;
}

/* ── Divider ── */
.divider {
  border: none;
  height: 1px;
  background: var(--border);
  max-width: var(--max-width);
  margin: 0 auto;
}

/* ── Features ── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  transition: all 0.25s ease;
}

.card:hover {
  border-color: rgba(128, 0, 0, 0.15);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.card-icon {
  font-size: 1.5rem;
  margin-bottom: 0.875rem;
  display: block;
}

.card-title {
  font-family: var(--font-body);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.4rem;
  letter-spacing: -0.01em;
}

.card-description {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
  margin-top: 0.875rem;
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 0.2rem 0.5rem;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: 4px;
}

/* ── Quickstart ── */
.quickstart-content {
  max-width: 680px;
  margin-inline: auto;
}

.code-block {
  background: var(--text);
  color: #e4e4e7;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.75;
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-lg);
  overflow-x: auto;
  margin-bottom: 1rem;
  box-shadow: var(--shadow-lg);
}

.code-block code {
  font-family: inherit;
  white-space: pre;
}

.code-comment {
  color: #6b7280;
}

.code-keyword {
  color: #f9a8d4;
}

.code-string {
  color: #86efac;
}

.code-function {
  color: #93c5fd;
}

.code-operator {
  color: #c4b5fd;
}

.code-prompt {
  color: #6b7280;
  user-select: none;
}

.quickstart-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--accent);
  text-decoration: none;
  margin-top: 0.75rem;
  transition: gap 0.2s;
}

.quickstart-link:hover {
  gap: 0.6rem;
}

.other-features {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  margin-top: 1rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.other-features-title {
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.other-features-list {
  list-style: disc;
  padding-left: 1.25rem;
  margin: 0;
}

.other-features-list li {
  margin-bottom: 0.15rem;
  color: var(--text);
  font-family: var(--font-body, sans-serif);
  font-weight: 400;
}

/* ── Architecture ── */
.architecture-figure {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  flex-wrap: wrap;
}

.architecture-img {
  max-width: 340px;
  width: calc(50% - 0.75rem);
  border: none;
  padding: 0;
  background: transparent;
  border-radius: 2.55rem;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

.architecture-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.375rem;
  margin-top: 1.5rem;
}

.architecture-caption {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 1rem;
  letter-spacing: 0.02em;
}

/* ── Demo Placeholder ── */
.demo-video {
  width: 100%;
  max-width: 600px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  display: block;
  margin: 0 auto;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

.demo-slot {
  background: var(--surface-manila);
  border: 2px dashed rgba(0, 0, 0, 0.12);
  border-radius: var(--radius-lg);
  padding: 2rem 2rem;
  text-align: center;
  max-width: 680px;
  margin-inline: auto;
}

.demo-slot-icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
  display: block;
  opacity: 0.5;
}

.demo-slot-text {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.examples-link {
  display: block;
  text-align: center;
  margin-top: 1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
}

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

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

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

.footer-links a {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}

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

.footer-copy {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

.footer-copy a {
  color: inherit;
  text-decoration: none;
}

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

/* ── Responsive ── */
@media (max-width: 768px) {
  :root {
    --section-gap: 2.5rem;
  }

  .container {
    padding: 0 1.25rem;
  }

  .hero {
    padding: 2.5rem 0 2rem;
  }

  .hero-logo-icon {
    height: 56px;
    width: 56px;
  }

  .hero-logo-text {
    font-size: 2.25rem;
  }

  .hero-tagline {
    font-size: 1.15rem;
  }

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

  .section-title {
    font-size: 1.4rem;
  }

  .nav-links {
    gap: 1rem;
  }

  .nav-links a {
    font-size: 0.68rem;
  }
}

@media (max-width: 480px) {
  .hero-logo-icon {
    height: 44px;
    width: 44px;
  }

  .hero-logo-text {
    font-size: 1.75rem;
  }

  .hero-tagline {
    font-size: 1.05rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    justify-content: center;
    max-width: 280px;
  }

  .code-block {
    font-size: 0.72rem;
    padding: 1.25rem;
  }

  .footer .container {
    flex-direction: column;
    text-align: center;
  }
}