/* NeriTest docs. Dark by default, teal accent. No orange, no purple gradient. */
:root {
  color-scheme: dark;

  --accent: #2dd4bf;
  --accent-strong: #14b8a6;
  --accent-ink: #5eead4;
  --accent-soft: rgba(45, 212, 191, 0.14);
  --accent-line: rgba(45, 212, 191, 0.4);

  --bg: #0b0d12;
  --surface: #12151c;
  --surface-2: #1a1e27;
  --text: #e7e9ee;
  --muted: #8b90a0;
  --border: #232733;
  --topbar-bg: rgba(11, 13, 18, 0.85);

  --code-bg: #0a0c10;
  --code-text: #e7e9ee;
  --code-dim: #6b7280;
  --code-str: #fbbf24;
  --code-key: #7dd3fc;
  --code-fn: #5eead4;

  --radius: 12px;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --sidebar-w: 250px;
  --content-max: 800px;
}

[data-theme="light"] {
  color-scheme: light;

  --accent: #0d9488;
  --accent-strong: #0f766e;
  --accent-ink: #0d6f66;
  --accent-soft: rgba(13, 148, 136, 0.1);
  --accent-line: rgba(13, 148, 136, 0.35);

  --bg: #faf8f5;
  --surface: #ffffff;
  --surface-2: #f2f1ec;
  --text: #1c1b1a;
  --muted: #6d6a64;
  --border: #e7e3db;
  --topbar-bg: rgba(250, 248, 245, 0.85);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.18s ease, color 0.18s ease;
}

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

code { font-family: var(--mono); font-size: 0.9em; }

.skip {
  position: absolute;
  left: -9999px;
}
.skip:focus {
  left: 12px;
  top: 12px;
  z-index: 100;
  background: var(--surface);
  padding: 8px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
}

/* ---- topbar ---- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  gap: 14px;
  height: 58px;
  padding: 0 20px;
  background: var(--topbar-bg);
  backdrop-filter: saturate(1.4) blur(8px);
  border-bottom: 1px solid var(--border);
  transition: background-color 0.18s ease, border-color 0.18s ease;
}
.brand {
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  color: var(--text);
}
.brand:hover { text-decoration: none; }
.mark { color: var(--accent-strong); }
.top-links {
  margin-left: auto;
  display: flex;
  gap: 20px;
  font-size: 0.92rem;
  font-weight: 500;
}
.top-links a { color: var(--muted); }
.top-links a:hover { color: var(--text); text-decoration: none; }
.menu-toggle, .theme-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  line-height: 1;
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  width: 38px;
  height: 38px;
  cursor: pointer;
  color: var(--text);
  flex-shrink: 0;
}
.menu-toggle { display: none; }
.theme-toggle {
  display: inline-flex;
  margin-left: auto;
}
.top-links + .theme-toggle,
.theme-toggle {
  margin-left: 0;
}
.theme-toggle:hover { border-color: var(--accent-line); color: var(--accent); }
.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .icon-moon { display: none; }
[data-theme="light"] .theme-toggle .icon-sun { display: none; }
[data-theme="light"] .theme-toggle .icon-moon { display: block; }

/* ---- layout ---- */
.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  max-width: 1240px;
  margin: 0 auto;
}
.sidebar {
  position: sticky;
  top: 58px;
  align-self: start;
  height: calc(100vh - 58px);
  overflow-y: auto;
  padding: 28px 16px 40px 24px;
  border-right: 1px solid var(--border);
  transition: border-color 0.18s ease, background-color 0.18s ease;
}
.nav-title {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--muted);
  font-weight: 700;
  margin: 0 0 12px 10px;
}
.nav { list-style: none; margin: 0; padding: 0; }
.nav li { margin: 1px 0; }
.nav a {
  display: block;
  padding: 7px 12px;
  border-radius: 8px;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 500;
  border-left: 2px solid transparent;
}
.nav a:hover { background: var(--surface-2); color: var(--text); text-decoration: none; }
.nav a.active {
  background: var(--accent-soft);
  color: var(--accent-ink);
  border-left-color: var(--accent);
  font-weight: 650;
}

main { min-width: 0; padding: 0 40px; }

/* ---- hero ---- */
.hero {
  margin: 32px 0 8px;
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(45, 212, 191, 0.2), transparent 55%),
    linear-gradient(160deg, #181b22 0%, #0e1015 70%);
  box-shadow: 0 30px 70px -40px rgba(0, 0, 0, 0.6);
  color: #f2f4f7;
  padding: 48px 44px;
  overflow: hidden;
}
.hero-inner { max-width: var(--content-max); }
.badge {
  display: inline-block;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 700;
  color: var(--accent);
  border: 1px solid var(--accent-line);
  border-radius: 999px;
  padding: 4px 12px;
  margin-bottom: 18px;
}
.hero h1 {
  font-size: clamp(2.6rem, 6vw, 3.9rem);
  margin: 0 0 14px;
  letter-spacing: -0.03em;
  line-height: 1;
}
.hero .mark { color: var(--accent); }
.lede {
  font-size: 1.12rem;
  color: #c7cbd4;
  max-width: 60ch;
  margin: 0 0 26px;
}
.lede code { background: rgba(255,255,255,0.08); padding: 1px 6px; border-radius: 6px; color: #5eead4; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 34px; }
.btn {
  display: inline-block;
  padding: 11px 20px;
  border-radius: 10px;
  font-weight: 650;
  font-size: 0.95rem;
}
.btn:hover { text-decoration: none; }
.btn.primary { background: var(--accent); color: #04211d; }
.btn.primary:hover { background: #5eead4; }
.btn.ghost { color: #eef0f3; border: 1px solid rgba(255,255,255,0.2); }
.btn.ghost:hover { border-color: var(--accent-line); color: #fff; }

.hero-term {
  background: #100f14;
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 20px 50px -24px rgba(0,0,0,0.6);
}
.term-bar {
  display: flex;
  gap: 7px;
  padding: 11px 14px;
  background: #1a1922;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.term-bar span { width: 11px; height: 11px; border-radius: 50%; background: #3a3945; }
.term-bar span:first-child { background: var(--accent); }
.hero-term pre {
  margin: 0;
  padding: 18px 20px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--code-text);
}
.c-key { color: var(--code-key); }
.c-str { color: var(--code-str); }
.c-fn { color: var(--code-fn); }
.c-cmt { color: var(--code-dim); font-style: italic; }

/* ---- article ---- */
.doc { max-width: var(--content-max); padding: 20px 0 40px; }
.doc h1, .doc h2, .doc h3, .doc h4 {
  line-height: 1.25;
  letter-spacing: -0.02em;
  scroll-margin-top: 74px;
}
.doc h1 { font-size: 2.2rem; margin: 30px 0 10px; }
.doc h2 {
  font-size: 1.55rem;
  margin: 46px 0 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.doc h3 { font-size: 1.2rem; margin: 30px 0 10px; }
.doc h4 { font-size: 1rem; margin: 22px 0 8px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; font-size: 0.8rem; }
.doc p { margin: 14px 0; }
.doc ul, .doc ol { padding-left: 22px; }
.doc li { margin: 6px 0; }
.doc li::marker { color: var(--accent); }
.doc blockquote {
  margin: 18px 0;
  padding: 4px 18px;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 8px 8px 0;
  color: var(--text);
}
.doc blockquote p { margin: 10px 0; }
.doc hr { border: none; border-top: 1px solid var(--border); margin: 40px 0; }

.doc strong { font-weight: 700; }

/* inline code */
.doc p code, .doc li code, .doc td code, .doc h2 code, .doc h3 code, .doc a code {
  background: var(--surface-2);
  border: 1px solid var(--border);
  padding: 1px 6px;
  border-radius: 6px;
  color: var(--accent-ink);
  white-space: nowrap;
}

/* code blocks */
.code-block {
  margin: 20px 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid #2a2933;
  background: var(--code-bg);
}
.code-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 14px;
  background: #16171d;
  border-bottom: 1px solid #23242c;
}
.code-lang {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  color: var(--accent);
}
.copy {
  font-family: var(--sans);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--code-dim);
  background: transparent;
  border: 1px solid #33343d;
  border-radius: 6px;
  padding: 3px 10px;
  cursor: pointer;
}
.copy:hover { color: #fff; border-color: var(--accent-line); }
.code-block pre {
  margin: 0;
  padding: 16px 18px;
  overflow-x: auto;
}
.code-block code {
  font-family: var(--mono);
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--code-text);
  white-space: pre;
}
.diff-add { color: #7ee0a1; display: inline-block; width: 100%; }
.diff-del { color: #ff8f8f; display: inline-block; width: 100%; }

/* tables */
.table-wrap { overflow-x: auto; margin: 20px 0; }
.doc table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.92rem;
}
.doc th, .doc td {
  border: 1px solid var(--border);
  padding: 9px 13px;
  text-align: left;
  vertical-align: top;
}
.doc thead th {
  background: var(--surface-2);
  font-weight: 700;
  color: var(--text);
}
.doc tbody tr:nth-child(even) { background: var(--surface-2); }

/* footer */
.foot {
  max-width: var(--content-max);
  margin-top: 30px;
  padding: 26px 0;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  color: var(--muted);
  font-size: 0.85rem;
  flex-wrap: wrap;
}

/* index page: no hero article top gap */
.doc-index { padding-top: 26px; }

/* ---- responsive ---- */
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  main { padding: 0 20px; }
  .menu-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .top-links { display: none; }
  .sidebar {
    position: fixed;
    top: 58px;
    left: 0;
    width: 82%;
    max-width: 320px;
    background: var(--surface);
    border-right: 1px solid var(--border);
    transform: translateX(-105%);
    transition: transform 0.2s ease;
    z-index: 45;
    box-shadow: 0 20px 60px -20px rgba(0,0,0,0.3);
  }
  .sidebar.open { transform: translateX(0); }
  .hero { padding: 34px 24px; border-radius: 14px; }
}