/* ============================================
   opnAssist — GitHub Pages site
   ============================================ */

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

:root {
  --bg: #121212;
  --bg-card: #1e1e1e;
  --bg-elevated: #252526;
  --border: #333;
  --text: #d4d4d4;
  --text-muted: #888;
  --text-heading: #fff;
  --accent: #0e639c;
  --accent-hover: #1177bb;
  --green: #4ec94e;
  --blue: #5b9bd5;
  --orange: #d49b5b;
  --salmon: #ce9178;
  --cyan: #9cdcfe;
  --max-w: 1100px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, Oxygen, Ubuntu, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  text-decoration: underline;
}

/* ---------- Nav ---------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(18, 18, 18, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  color: var(--text-heading);
}

.nav-brand img {
  width: 28px;
  height: 28px;
  border-radius: 6px;
}

.nav-links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
  transition: color 0.15s;
}

.nav-links a:hover {
  color: var(--text-heading);
  text-decoration: none;
}

/* ---------- Hero ---------- */

.hero {
  text-align: center;
  padding: 80px 24px 60px;
  background: linear-gradient(180deg, #0a2a48 0%, var(--bg) 100%);
}

.hero h1 {
  font-size: 48px;
  font-weight: 800;
  color: var(--text-heading);
  margin-bottom: 12px;
  letter-spacing: -0.5px;
}

.hero .tagline {
  font-size: 20px;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 32px;
}

.cta-row {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: background 0.15s;
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

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

.btn-secondary {
  background: var(--bg-elevated);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: #2d2d2d;
  text-decoration: none;
}

/* ---------- Sections ---------- */

.section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 64px 24px;
}

.section-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 8px;
}

.section-subtitle {
  color: var(--text-muted);
  font-size: 16px;
  margin-bottom: 40px;
  max-width: 650px;
}

/* ---------- Feature grid ---------- */

.features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 32px;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
}

.feature-card.green::before { background: var(--green); }
.feature-card.blue::before { background: var(--blue); }
.feature-card.orange::before { background: var(--orange); }
.feature-card.salmon::before { background: var(--salmon); }

.feature-card h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 16px;
}

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

.feature-card li {
  position: relative;
  padding-left: 20px;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.5;
}

.feature-card li::before {
  content: "\2713";
  position: absolute;
  left: 0;
  font-weight: 700;
}

.feature-card.green li::before { color: var(--green); }
.feature-card.blue li::before { color: var(--blue); }
.feature-card.orange li::before { color: var(--orange); }
.feature-card.salmon li::before { color: var(--salmon); }

/* ---------- Permissions table ---------- */

.perm-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.perm-table th,
.perm-table td {
  text-align: left;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
}

.perm-table th {
  color: var(--text-heading);
  font-weight: 600;
  background: var(--bg-elevated);
}

.perm-table td:first-child {
  font-family: "SF Mono", "Fira Code", "Cascadia Code", monospace;
  font-size: 13px;
  color: var(--cyan);
  white-space: nowrap;
}

/* ---------- Footer ---------- */

.footer {
  border-top: 1px solid var(--border);
  padding: 32px 24px;
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
}

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

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

/* ---------- Privacy page ---------- */

.prose {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 24px 80px;
}

.prose h1 {
  font-size: 36px;
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 8px;
}

.prose .meta {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 40px;
}

.prose h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-heading);
  margin-top: 40px;
  margin-bottom: 12px;
}

.prose p {
  margin-bottom: 16px;
}

.prose ul,
.prose ol {
  margin-bottom: 16px;
  padding-left: 24px;
}

.prose li {
  margin-bottom: 6px;
}

.prose strong {
  color: var(--text-heading);
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 16px;
  font-size: 14px;
}

.prose table th,
.prose table td {
  text-align: left;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
}

.prose table th {
  color: var(--text-heading);
  font-weight: 600;
  background: var(--bg-elevated);
}

.prose table td:first-child {
  font-family: monospace;
  font-size: 13px;
  color: var(--cyan);
  white-space: nowrap;
}

/* ---------- Responsive ---------- */

@media (max-width: 720px) {
  .hero h1 {
    font-size: 32px;
  }

  .hero .tagline {
    font-size: 16px;
  }

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

  .section {
    padding: 40px 16px;
  }

  .nav-links {
    gap: 16px;
  }
}