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

:root {
  --orange-1: #FF7A3D;
  --orange-2: #F0491E;
  --ink: #14120F;
  --ink-soft: #57534E;
  --paper: #FBFAF8;
  --paper-raised: #FFFFFF;
  --line: #E7E3DD;
  --code-bg: #F3F1EC;
  --link: #D8441E;
  --ring: rgba(240, 73, 30, 0.35);
  --sidebar-w: 296px;
  --shadow-sm: 0 1px 2px rgba(20,18,15,0.05);
  --shadow-md: 0 8px 24px -8px rgba(20,18,15,0.14);
  --radius: 12px;
}

[data-theme="dark"] {
  --ink: #EDEAE4;
  --ink-soft: #A19C93;
  --paper: #100E0C;
  --paper-raised: #1A1714;
  --line: #2C2721;
  --code-bg: #1E1A16;
  --link: #FF9260;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 12px 32px -8px rgba(0,0,0,0.55);
}

* { box-sizing: border-box; }
::selection { background: var(--orange-1); color: #14120F; }

html { scroll-behavior: smooth; }
html, body {
  margin: 0; padding: 0;
  background: var(--paper); color: var(--ink);
  font-family: 'Inter', -apple-system, "Segoe UI", sans-serif;
  font-size: 16px; line-height: 1.7;
  transition: background .2s ease, color .2s ease;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, .brand, .logo-mark { font-family: 'Manrope', 'Inter', sans-serif; }

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--orange-2); outline-offset: 2px; border-radius: 4px; }
@media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important; } }

/* ===== Top bar ===== */
.topbar {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; gap: 1rem;
  height: 64px; padding: 0 1.5rem;
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter: blur(10px) saturate(140%);
  border-bottom: 1px solid var(--line);
}
.topbar .brand {
  display: flex; align-items: center; gap: .65rem;
  font-weight: 800; font-size: 1.05rem; white-space: nowrap;
  color: var(--ink); letter-spacing: -0.01em;
}
.logo-mark {
  width: 26px; height: 26px; border-radius: 8px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--orange-1), var(--orange-2));
  color: #fff; font-weight: 800; font-size: .82rem;
  box-shadow: 0 2px 6px rgba(240,73,30,0.35);
}
.topbar .search {
  flex: 1; max-width: 380px;
  display: flex; align-items: center; gap: .55rem;
  border: 1px solid var(--line); border-radius: 10px;
  padding: .5rem .8rem; color: var(--ink-soft); font-size: .88rem;
  background: var(--paper-raised);
  transition: border-color .15s ease, box-shadow .15s ease;
}
.topbar .search:hover { border-color: var(--orange-1); }
.topbar .spacer { flex: 1; }
.topbar .lang-badge, .topbar .theme-toggle {
  border: 1px solid var(--line); border-radius: 8px;
  padding: .42rem .75rem; background: var(--paper-raised);
  color: var(--ink-soft); font-size: .82rem; cursor: pointer;
  font-weight: 500; transition: border-color .15s ease, color .15s ease;
}
.topbar .theme-toggle:hover, .topbar .lang-badge:hover { border-color: var(--orange-1); color: var(--ink); }

/* ===== Layout ===== */
.layout {
  display: flex; align-items: flex-start;
  max-width: 1440px; margin: 0 auto;
}
.sidebar {
  width: var(--sidebar-w); flex-shrink: 0;
  border-right: 1px solid var(--line);
  background: var(--paper);
  height: calc(100vh - 64px);
  position: sticky; top: 64px;
  overflow-y: auto;
  padding: 1.5rem 1.1rem 3rem;
  scrollbar-width: thin;
}
.sidebar h4 {
  font-size: .7rem; text-transform: uppercase; letter-spacing: .08em;
  color: var(--ink-soft); margin: 1.5rem .5rem .5rem; font-weight: 700;
  opacity: .75;
}
.sidebar ul { list-style: none; margin: 0; padding: 0; }
.sidebar li a, .sidebar li span.disabled {
  display: block; padding: .4rem .6rem; border-radius: 8px;
  font-size: .89rem; color: var(--ink); font-weight: 500;
  border-left: 2px solid transparent; transition: background .15s ease, border-color .15s ease;
}
.sidebar li a:hover { background: var(--code-bg); text-decoration: none; }
.sidebar li a.active {
  background: linear-gradient(90deg, rgba(240,73,30,0.14), rgba(240,73,30,0.02));
  border-left: 2px solid var(--orange-2); color: var(--orange-2); font-weight: 700;
}
.sidebar li span.disabled { color: var(--ink-soft); opacity: .45; cursor: default; font-weight: 400; }
.sidebar li span.disabled .soon {
  font-size: .64rem; margin-left: .35rem; border: 1px solid var(--line);
  border-radius: 20px; padding: .05rem .45rem; vertical-align: middle; opacity: .8;
}

.content {
  flex: 1; min-width: 0;
  padding: 3rem 3.5rem 6rem;
  max-width: 860px;
}
.content .crumbs {
  color: var(--ink-soft); font-size: .82rem; margin-bottom: .9rem;
  font-weight: 500; text-transform: uppercase; letter-spacing: .04em;
}
.content h1 {
  font-size: 2.35rem; font-weight: 800; letter-spacing: -0.02em;
  margin: 0 0 1.5rem; line-height: 1.15;
}
.content h2 {
  font-size: 1.4rem; font-weight: 700; letter-spacing: -0.01em;
  margin: 2.6rem 0 1rem; padding-bottom: .5rem; border-bottom: 1px solid var(--line);
}
.content h3 { font-size: 1.1rem; font-weight: 700; margin: 1.8rem 0 .6rem; }
.content p { margin: .9rem 0; color: var(--ink); }
.content ul, .content ol { padding-left: 1.4rem; }
.content li { margin: .35rem 0; }
.content code {
  background: var(--code-bg); padding: .15rem .45rem; border-radius: 5px;
  font-size: .85em; font-family: 'JetBrains Mono', monospace;
  border: 1px solid var(--line);
}
.content pre {
  background: var(--code-bg); padding: 1.1rem; border-radius: var(--radius);
  overflow-x: auto; border: 1px solid var(--line);
}
.callout {
  position: relative;
  background: linear-gradient(135deg, color-mix(in srgb, var(--orange-1) 8%, var(--paper-raised)), var(--paper-raised));
  border: 1px solid var(--line); border-left: 3px solid var(--orange-2);
  padding: 1rem 1.2rem; border-radius: 0 var(--radius) var(--radius) 0; margin: 1.4rem 0;
  box-shadow: var(--shadow-sm);
}
.callout b { color: var(--orange-2); }
table { border-collapse: collapse; width: 100%; margin: 1.2rem 0; font-size: .9rem; border-radius: var(--radius); overflow: hidden; }
th, td { border: 1px solid var(--line); padding: .6rem .8rem; text-align: left; vertical-align: top; }
th { background: var(--code-bg); font-weight: 700; font-size: .8rem; text-transform: uppercase; letter-spacing: .03em; }
.img-note { color: var(--ink-soft); font-size: .8rem; font-style: italic; }
.pager {
  display: flex; justify-content: space-between; gap: 1rem; margin-top: 3.5rem;
  padding-top: 1.4rem; border-top: 1px solid var(--line);
}
.pager a {
  border: 1px solid var(--line); border-radius: 10px; padding: .7rem 1.1rem;
  font-weight: 600; font-size: .88rem; color: var(--ink); transition: border-color .15s ease, transform .15s ease;
}
.pager a:hover { border-color: var(--orange-1); text-decoration: none; transform: translateY(-1px); }

/* ===== Home / hero ===== */
.hero {
  position: relative; padding: 5.5rem 1.5rem 3rem; text-align: center; overflow: hidden;
}
.hero::before {
  content: ""; position: absolute; inset: -20% -10% auto -10%; height: 480px;
  background:
    radial-gradient(ellipse 60% 50% at 30% 20%, color-mix(in srgb, var(--orange-1) 22%, transparent), transparent 70%),
    radial-gradient(ellipse 50% 40% at 75% 10%, color-mix(in srgb, var(--orange-2) 16%, transparent), transparent 70%);
  pointer-events: none; z-index: 0;
}
.hero > * { position: relative; z-index: 1; }
.eyebrow {
  display: inline-flex; align-items: center; gap: .5rem;
  font-size: .78rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em;
  color: var(--orange-2); background: color-mix(in srgb, var(--orange-1) 12%, transparent);
  padding: .35rem .9rem; border-radius: 20px; margin-bottom: 1.2rem;
}
.hero h1 {
  font-family: 'Manrope', sans-serif; font-weight: 800; letter-spacing: -0.03em;
  font-size: clamp(2.2rem, 5vw, 3.1rem); margin: 0 0 .8rem; line-height: 1.08;
}
.hero p.lead { color: var(--ink-soft); font-size: 1.12rem; max-width: 560px; margin: 0 auto; }

/* session-window signature element */
.session-frame {
  max-width: 640px; margin: 2.6rem auto 0; border-radius: 14px;
  background: var(--paper-raised); border: 1px solid var(--line);
  box-shadow: var(--shadow-md); overflow: hidden; text-align: left;
}
.session-frame .chrome {
  display: flex; align-items: center; gap: .5rem;
  padding: .65rem .9rem; background: var(--code-bg); border-bottom: 1px solid var(--line);
}
.session-frame .chrome .dot { width: 9px; height: 9px; border-radius: 50%; background: var(--line); }
.session-frame .chrome .addr {
  margin-left: .6rem; font-family: 'JetBrains Mono', monospace; font-size: .74rem;
  color: var(--ink-soft); background: var(--paper); border: 1px solid var(--line);
  border-radius: 6px; padding: .15rem .6rem; flex: 1;
}
.session-frame .body { padding: 1.1rem 1.3rem; font-family: 'JetBrains Mono', monospace; font-size: .82rem; color: var(--ink-soft); }
.session-frame .body .line { display: flex; align-items: center; gap: .6rem; padding: .3rem 0; }
.session-frame .body .pulse {
  width: 7px; height: 7px; border-radius: 50%; background: var(--orange-1); flex-shrink: 0;
  box-shadow: 0 0 0 0 rgba(240,73,30,0.5); animation: pulse 2s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(240,73,30,0.45); }
  70% { box-shadow: 0 0 0 8px rgba(240,73,30,0); }
  100% { box-shadow: 0 0 0 0 rgba(240,73,30,0); }
}
.session-frame .body .ok { color: var(--orange-2); font-weight: 500; }

.cards {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 1.3rem; max-width: 1140px; margin: 3rem auto; padding: 0 1.5rem;
}
.card {
  background: var(--paper-raised); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.7rem; box-shadow: var(--shadow-sm); position: relative; overflow: hidden;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--orange-1), var(--orange-2));
  opacity: 0; transition: opacity .18s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: color-mix(in srgb, var(--orange-1) 40%, var(--line)); }
.card:hover::before { opacity: 1; }
.card .icon {
  width: 42px; height: 42px; border-radius: 10px; display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem; margin-bottom: .9rem;
  background: color-mix(in srgb, var(--orange-1) 14%, transparent);
}
.card h3 { margin: 0 0 .4rem; font-size: 1.12rem; font-weight: 700; letter-spacing: -0.01em; }
.card p { color: var(--ink-soft); font-size: .89rem; margin: 0 0 1rem; line-height: 1.6; }
.card .start-link { font-weight: 700; font-size: .9rem; }
.card .popular { margin-top: .9rem; padding-top: .9rem; border-top: 1px solid var(--line); }
.card .popular a { display: block; font-size: .84rem; margin: .4rem 0; color: var(--ink-soft); font-weight: 500; }
.card .popular a:hover { color: var(--orange-2); }
.badge-soon {
  display: inline-block; font-size: .64rem; border: 1px solid var(--line);
  border-radius: 20px; padding: .12rem .5rem; color: var(--ink-soft); margin-left: .4rem; font-weight: 500;
}

@media (max-width: 900px) {
  .sidebar { display: none; }
  .content { padding: 2rem 1.4rem 4rem; }
}