:root {
  --bg: #0b0d10;
  --bg-alt: #101318;
  --surface: #151a21;
  --border: #232a33;
  --text: #e8ecf1;
  --muted: #9aa5b1;
  --accent: #2fa3e6;
  --accent-soft: rgba(47, 163, 230, 0.14);
  --accent-2: #e8503a;
  --radius: 12px;
  --font: "Inter", system-ui, -apple-system, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }

code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 0.1em 0.4em;
  color: var(--accent-2);
}

h1, h2, h3 { line-height: 1.2; letter-spacing: -0.02em; }
h1 { font-size: clamp(2.1rem, 5vw, 3.4rem); font-weight: 800; }
h2 { font-size: clamp(1.5rem, 3.2vw, 2.2rem); font-weight: 700; }
h3 { font-size: 1.05rem; font-weight: 600; }

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

.eyebrow {
  color: var(--accent-2);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 12px;
}

.fine { color: var(--muted); font-size: 0.82rem; }

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11, 13, 16, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand { display: inline-flex; align-items: center; }

.logo-nav { height: 42px; display: block; }
.logo-hero {
  height: clamp(110px, 18vw, 170px);
  margin-bottom: 28px;
  filter: drop-shadow(0 8px 40px rgba(47, 163, 230, 0.35));
}
.logo-footer { height: 56px; display: block; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
}

.nav-links a {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 500;
}
.nav-links a:hover { color: var(--text); text-decoration: none; }
.nav-links a.is-current { color: var(--text); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 11px 22px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.92rem;
  transition: all 0.15s ease;
  border: 1px solid transparent;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 24px rgba(47, 163, 230, 0.35);
}
.btn-primary:hover { background: #4db3ef; }

.btn-outline {
  border-color: var(--border);
  color: var(--text);
}
.btn-outline:hover { border-color: var(--accent); }

.btn-ghost {
  border-color: var(--border);
  color: var(--text) !important;
  padding: 8px 16px;
}
.btn-ghost:hover { border-color: var(--accent); }

/* ---------- Hero ---------- */
.hero {
  padding: 96px 0 0;
  text-align: center;
  background:
    radial-gradient(ellipse 60% 40% at 50% 0%, rgba(47, 163, 230, 0.13), transparent),
    radial-gradient(ellipse 40% 30% at 80% 10%, rgba(232, 80, 58, 0.07), transparent);
}

.hero-eyebrow {
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 18px;
}

.hero-sub {
  max-width: 640px;
  margin: 22px auto 0;
  color: var(--muted);
  font-size: 1.08rem;
}

.hero-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  margin-top: 32px;
  flex-wrap: wrap;
}

.hero-shot {
  margin-top: 64px;
  padding: 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-bottom: none;
  border-radius: var(--radius) var(--radius) 0 0;
  box-shadow: 0 -20px 80px rgba(47, 163, 230, 0.12);
}

.hero-shot img,
.split-media img {
  width: 100%;
  display: block;
  border-radius: 8px;
}

/* ---------- Strip ---------- */
.strip {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.strip-inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  padding: 36px 24px;
}

.strip-item { text-align: center; }

.strip-num {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
}

.strip-label {
  color: var(--muted);
  font-size: 0.85rem;
}

/* ---------- Sections ---------- */
.section { padding: 96px 0; }
.section-alt { background: var(--bg-alt); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

.section-head {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 56px;
}

.section-sub { color: var(--muted); margin-top: 14px; font-size: 1.02rem; }

/* ---------- Split layout ---------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}

.split-text > p { color: var(--muted); margin-top: 14px; }
.split-text h2 { margin-top: 4px; }

.split-media {
  padding: 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.caption {
  color: var(--muted);
  font-size: 0.82rem;
  padding: 10px 6px 2px;
  text-align: center;
}

.checklist {
  list-style: none;
  margin-top: 20px;
}

.checklist li {
  padding: 7px 0 7px 30px;
  position: relative;
  color: var(--text);
}

.checklist li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--accent-2);
  font-weight: 700;
}

/* ---------- Cards ---------- */
.cards {
  display: grid;
  gap: 20px;
}
.cards-3 { grid-template-columns: repeat(3, 1fr); }

.card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

a.card { color: inherit; text-decoration: none; }
a.card:hover { text-decoration: none; }

.card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.card-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 9px;
  font-family: var(--mono);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  margin-bottom: 16px;
}

.card p {
  color: var(--muted);
  font-size: 0.92rem;
  margin-top: 8px;
}

.card-more {
  display: inline-block;
  margin-top: 16px;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 600;
}

.card-more::after {
  content: " \2192";
  transition: margin 0.15s ease;
}

.card:hover .card-more::after { margin-left: 4px; }

/* ---------- Callout ---------- */
.callout {
  margin-top: 40px;
  padding: 32px 36px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--accent-soft), rgba(232, 80, 58, 0.08));
  border: 1px solid rgba(47, 163, 230, 0.35);
}

.callout h3 { font-size: 1.25rem; }
.callout p { color: var(--text); opacity: 0.85; margin-top: 10px; max-width: 800px; }

/* ---------- Steps ---------- */
.steps {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  counter-reset: step;
}

.steps li {
  display: flex;
  gap: 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
}

.step-num {
  flex-shrink: 0;
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 700;
  font-size: 0.95rem;
}

.steps p { color: var(--muted); font-size: 0.9rem; margin-top: 2px; }

/* ---------- Code block ---------- */
.code-block {
  margin-top: 24px;
  background: #0d1015;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.code-title {
  padding: 10px 18px;
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
}

.code-block pre {
  padding: 18px;
  overflow-x: auto;
}

.code-block code {
  background: none;
  border: none;
  padding: 0;
  color: var(--text);
  font-size: 0.88rem;
  line-height: 1.7;
}

.code-block .c { color: var(--muted); }

#get-started .fine { margin-top: 18px; }

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--border);
  background: var(--bg-alt);
  padding: 48px 0 32px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}

.footer-inner .fine { margin-top: 10px; max-width: 380px; }

.footer-links {
  display: flex;
  gap: 22px;
  align-items: flex-start;
  flex-wrap: wrap;
}

.footer-links a { color: var(--muted); font-size: 0.9rem; }
.footer-links a:hover { color: var(--text); }

.footer-legal {
  margin-top: 36px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

/* =======================================================
   GUIDE PAGE
   ======================================================= */

/* ---------- Guide header ---------- */
.guide-head {
  padding: 64px 0 32px;
  background:
    radial-gradient(ellipse 60% 60% at 20% 0%, rgba(47, 163, 230, 0.12), transparent),
    radial-gradient(ellipse 40% 50% at 85% 10%, rgba(232, 80, 58, 0.07), transparent);
}

.guide-head h1 { font-size: clamp(1.9rem, 4vw, 2.9rem); }

.guide-lede {
  margin-top: 16px;
  max-width: 640px;
  color: var(--muted);
  font-size: 1.05rem;
}

/* ---------- Category tabs ---------- */
.cat-bar {
  position: sticky;
  top: 64px;
  z-index: 40;
  background: rgba(11, 13, 16, 0.9);
  backdrop-filter: blur(12px);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.cat-tabs {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: none;
}
.cat-tabs::-webkit-scrollbar { display: none; }

.cat-tab {
  flex-shrink: 0;
  appearance: none;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--muted);
  font-family: inherit;
  font-size: 0.92rem;
  font-weight: 600;
  padding: 16px 14px 14px;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.cat-tab:hover { color: var(--text); }

.cat-tab.is-active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ---------- Guide layout ---------- */
.guide-shell {
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr);
  gap: 48px;
  align-items: start;
  padding-top: 44px;
  padding-bottom: 96px;
}

/* ---------- Sub-tab rail ---------- */
.sub-rail {
  position: sticky;
  top: 132px;
}

.sub-list { display: none; }
.sub-list.is-active { display: block; }

.rail-title {
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  padding: 0 12px 10px;
}

.sub-tab {
  display: block;
  width: 100%;
  text-align: left;
  appearance: none;
  background: none;
  border: none;
  border-left: 2px solid var(--border);
  color: var(--muted);
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 500;
  padding: 9px 14px;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.sub-tab:hover {
  color: var(--text);
  background: var(--surface);
}

.sub-tab.is-active {
  color: var(--text);
  font-weight: 600;
  border-left-color: var(--accent-2);
  background: var(--surface);
}

/* ---------- Panels ---------- */
.panel { display: none; }
.panel.is-active { display: block; animation: panel-in 0.18s ease; }

@keyframes panel-in {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: none; }
}

.crumb {
  color: var(--accent-2);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 10px;
}

.panel h2 { font-size: clamp(1.5rem, 3vw, 2rem); }

.panel h3 {
  margin-top: 38px;
  font-size: 1.12rem;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.panel h4 { font-size: 0.95rem; font-weight: 700; }

.panel p { color: var(--muted); margin-top: 14px; }
.panel p strong { color: var(--text); font-weight: 600; }

.panel .lede {
  color: var(--text);
  font-size: 1.05rem;
  margin-top: 16px;
  opacity: 0.9;
}

.panel .checklist { margin-top: 16px; }
.panel .checklist li { color: var(--muted); font-size: 0.95rem; }
.panel .checklist li strong { color: var(--text); }

.panel .code-block { margin-top: 24px; }

/* ---------- How-to lists ---------- */
.howto {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: howto;
}

.howto li {
  counter-increment: howto;
  position: relative;
  padding: 9px 0 9px 42px;
  color: var(--muted);
  font-size: 0.95rem;
}

.howto li strong { color: var(--text); font-weight: 600; }

.howto li::before {
  content: counter(howto);
  position: absolute;
  left: 0;
  top: 7px;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 700;
}

/* ---------- Key/value tables ---------- */
.kv {
  width: 100%;
  margin-top: 18px;
  border-collapse: collapse;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  font-size: 0.9rem;
}

.kv th,
.kv td {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.kv thead th {
  background: var(--surface);
  color: var(--text);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.kv tbody td { color: var(--muted); }
.kv tbody td:first-child { color: var(--text); font-weight: 500; white-space: nowrap; }
.kv.cmd tbody td:nth-child(2) { white-space: nowrap; }
.kv tbody tr:last-child td { border-bottom: none; }
.kv tbody tr:hover td { background: rgba(47, 163, 230, 0.05); }

/* ---------- Tip / warning callouts ---------- */
.tip,
.warn {
  margin-top: 28px;
  padding: 18px 22px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  border-left-width: 3px;
  background: var(--surface);
}

.tip { border-left-color: var(--accent); }
.warn { border-left-color: var(--accent-2); }

.tip h4 { color: var(--accent); }
.warn h4 { color: var(--accent-2); }

.tip p,
.warn p { margin-top: 6px; font-size: 0.92rem; }

/* ---------- Screen layout map ---------- */
.layout-map {
  margin-top: 22px;
  display: grid;
  gap: 8px;
  font-size: 0.82rem;
}

.layout-map .lm-row,
.layout-map .lm-col,
.layout-map .lm-stage,
.layout-map .lm-channels {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  color: var(--text);
  font-weight: 600;
}

.layout-map span {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-weight: 400;
}

.layout-map .lm-top {
  border-color: rgba(47, 163, 230, 0.4);
  background: var(--accent-soft);
}

.lm-mid {
  display: grid;
  grid-template-columns: 0.8fr 1.6fr 0.9fr;
  gap: 8px;
}

.lm-center {
  display: grid;
  gap: 8px;
  align-content: start;
}

/* ---------- Guide responsive ---------- */
@media (max-width: 900px) {
  .guide-shell {
    grid-template-columns: 1fr;
    gap: 24px;
    padding-top: 28px;
  }

  .sub-rail { position: static; }

  .sub-list.is-active {
    display: flex;
    gap: 6px;
    overflow-x: auto;
    padding-bottom: 6px;
    scrollbar-width: none;
  }
  .sub-list.is-active::-webkit-scrollbar { display: none; }

  .rail-title { display: none; }

  .sub-tab {
    flex-shrink: 0;
    width: auto;
    border-left: none;
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 7px 14px;
    font-size: 0.85rem;
  }

  .sub-tab.is-active {
    border-color: var(--accent-2);
    background: var(--surface);
  }

  .lm-mid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .cat-bar { top: 63px; }
  .cat-tab { font-size: 0.85rem; padding: 14px 10px 12px; }
  .guide-head { padding: 40px 0 24px; }
  .kv { display: block; overflow-x: auto; white-space: normal; }
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .cards-3 { grid-template-columns: repeat(2, 1fr); }
  .split { grid-template-columns: 1fr; gap: 36px; }
  .strip-inner { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .cards-3 { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .nav-links a:not(.btn) { display: none; }
  .section { padding: 64px 0; }
  .hero { padding-top: 64px; }
}