@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=Outfit:wght@500;600;700;800&family=JetBrains+Mono&display=swap');

:root {
  --bg: #020203;
  --bg-gradient: radial-gradient(circle at 50% -20%, #111827 0%, #020203 80%);
  --surface: rgba(17, 17, 19, 0.6);
  --surface-hover: rgba(25, 25, 28, 0.8);
  --border: rgba(255, 255, 255, 0.08);
  --border-bright: rgba(255, 255, 255, 0.15);
  --text: #f8fafc;
  --text-muted: #94a3b8;
  --accent: #3b82f6;
  --accent-glow: rgba(59, 130, 246, 0.4);
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --radius: 16px;
  --radius-sm: 8px;
  --glass: blur(12px);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  background-color: var(--bg);
}

body {
  background: var(--bg-gradient) fixed;
  color: var(--text);
  font-family: 'Inter', -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ── Typography ── */
h1, h2, h3, h4 {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #fff;
}

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

a:hover {
  filter: brightness(1.2);
}

code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85em;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 6px;
  color: #e2e8f0;
}

/* ── Topbar ── */
.topbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(2, 2, 3, 0.7);
  backdrop-filter: var(--glass);
  -webkit-backdrop-filter: var(--glass);
  border-bottom: 1px solid var(--border);
  padding: 16px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  animation: slideDown 0.5s ease;
}

@keyframes slideDown {
  from { transform: translateY(-100%); }
  to { transform: translateY(0); }
}

.topbar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: 'Outfit', sans-serif;
  font-weight: 800;
  font-size: 1.2rem;
  color: #fff;
  text-decoration: none;
}

.topbar-brand svg {
  color: var(--accent);
  filter: drop-shadow(0 0 8px var(--accent-glow));
}

.topbar-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  background: var(--surface);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.topbar-back:hover {
  background: var(--surface-hover);
  color: #fff;
  border-color: var(--border-bright);
  transform: translateX(-4px);
}

/* ── Layout ── */
.wrapper {
  max-width: 880px;
  margin: 0 auto;
  padding: 64px 24px 120px;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

section {
  margin-bottom: 64px;
  animation: fadeInUp 0.6s ease both;
}

section:nth-child(2) { animation-delay: 0.1s; }
section:nth-child(3) { animation-delay: 0.2s; }
section:nth-child(4) { animation-delay: 0.3s; }

.page-title {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 8px;
  background: linear-gradient(to right, #fff, #94a3b8);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.page-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.page-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 48px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.page-meta span {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ── Components ── */
.card {
  background: var(--surface);
  backdrop-filter: var(--glass);
  -webkit-backdrop-filter: var(--glass);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: var(--transition);
}

.card:hover {
  border-color: var(--border-bright);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

h2 {
  font-size: 1.5rem;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}

h2 .section-num {
  color: var(--accent);
  opacity: 0.5;
  font-size: 0.8em;
}

/* Alerts */
.alert {
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 32px;
  position: relative;
  overflow: hidden;
}

.alert::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
}

.alert-info { background: rgba(59, 130, 246, 0.1); color: #93c5fd; }
.alert-info::before { background: var(--accent); }

.alert-warning { background: rgba(245, 158, 11, 0.1); color: #fde68a; }
.alert-warning::before { background: var(--warning); }

.alert-danger { background: rgba(239, 68, 68, 0.1); color: #fca5a5; }
.alert-danger::before { background: var(--danger); }

.alert strong {
  display: block;
  margin-bottom: 8px;
  font-family: 'Outfit', sans-serif;
  font-size: 1rem;
  color: #fff;
}

/* TOC */
.toc {
  margin-bottom: 48px;
}

.toc h3 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.toc ol {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 12px;
  list-style: none;
}

.toc a {
  display: block;
  padding: 10px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 0.9rem;
  transition: var(--transition);
}

.toc a:hover {
  background: var(--surface-hover);
  color: var(--accent);
  border-color: var(--accent);
  transform: translateY(-2px);
}

/* Status Cards */
.status-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  margin: 24px 0;
}

.status-card {
  height: 100%;
}

.status-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 2px 8px;
  border-radius: 99px;
  margin-bottom: 12px;
}

.badge-done { background: rgba(16, 185, 129, 0.15); color: var(--success); }
.badge-plan { background: rgba(245, 158, 11, 0.15); color: var(--warning); }

/* Timeline (Changelog) */
.timeline {
  position: relative;
  padding-left: 32px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 0;
  width: 2px;
  background: var(--border);
}

.release {
  position: relative;
  margin-bottom: 80px;
}

.release::before {
  content: '';
  position: absolute;
  left: -32px;
  top: 8px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bg);
  border: 4px solid var(--accent);
  box-shadow: 0 0 0 4px var(--bg);
  z-index: 2;
}

.release.latest::before { border-color: var(--success); }

.release-header {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 24px;
}

.release-version { font-size: 2rem; color: #fff; }
.release-date { color: var(--text-muted); font-size: 0.9rem; }

.change-group {
  margin-bottom: 32px;
}

.change-group h3 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
  color: var(--text-muted);
}

.change-list {
  display: grid;
  gap: 12px;
  list-style: none;
}

.change-list li {
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

/* ── Footer ── */
.footer {
  margin-top: 120px;
  padding: 64px 24px;
  border-top: 1px solid var(--border);
  text-align: center;
  background: rgba(0, 0, 0, 0.2);
}

.footer-nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 24px;
  margin-bottom: 32px;
}

.footer-nav a {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 500;
}

.footer-nav a:hover {
  color: #fff;
}

.footer-legal {
  font-size: 0.8rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 24px;
  line-height: 1.8;
}

.footer-copyright {
  font-size: 0.85rem;
  font-family: 'Outfit', sans-serif;
  color: var(--text-muted);
}

.footer-copyright strong {
  color: #fff;
}

/* ── Mobile ── */
@media (max-width: 640px) {
  .page-title { font-size: 2.2rem; }
  .wrapper { padding-top: 40px; }
  .topbar { padding: 12px 20px; }
  .card { padding: 24px; }
  .toc ol { grid-template-columns: 1fr; }
  .release-header { flex-direction: column; gap: 4px; }
}