/* ── Redis 实战 ── */
:root {
  --bg: #0d1117;
  --surface: #161b22;
  --surface-2: #21262d;
  --card: #1c2128;
  --card-hover: #262c36;
  --border: rgba(180,185,210,0.12);
  --border-bright: rgba(180,185,210,0.28);
  --text: #e6edf3;
  --text-2: #adbac7;
  --text-3: #768390;
  --accent: #ff7b72;
  --accent-2: #ffa198;
  --accent-glow: rgba(255,123,114,0.12);
  --green: #56d364;
  --blue: #79c0ff;
  --orange: #ffa657;
  --purple: #d2a8ff;
  --yellow: #e3b341;
  --radius: 10px;
  --radius-lg: 14px;
  --mono: 'SF Mono', 'Fira Code', Consolas, monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: -apple-system, 'Inter', 'Segoe UI', sans-serif; background: var(--bg); color: var(--text); line-height: 1.65; -webkit-font-smoothing: antialiased; }

/* ── Nav ── */
.nav { position: sticky; top: 0; z-index: 100; background: rgba(13,17,23,0.95); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); padding: 0 24px; height: 52px; display: flex; align-items: center; gap: 16px; }
.nav-back { color: var(--accent-2); text-decoration: none; font-size: 0.88rem; display: flex; align-items: center; gap: 4px; transition: color 0.2s; }
.nav-back::before { content: '‹'; font-size: 1.3rem; }
.nav-back:hover { color: var(--text); }
.nav-title { font-size: 0.92rem; font-weight: 600; flex: 1; color: var(--text); }
.nav-badge { background: var(--accent); color: #fff; font-size: 0.65rem; font-weight: 700; padding: 3px 10px; border-radius: 20px; }

/* ── Hero (index) ── */
.hero { background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(255,123,114,0.08) 0%, transparent 65%), var(--surface); color: var(--text); padding: 80px 24px 70px; text-align: center; position: relative; overflow: hidden; border-bottom: 1px solid var(--border); }
.hero::before { content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: linear-gradient(to bottom, var(--accent), var(--orange), var(--purple)); }
.hero::after { content: ''; position: absolute; inset: 0; background: radial-gradient(circle at 80% 50%, rgba(220,56,45,0.06) 0%, transparent 50%); pointer-events: none; }
.hero-icon { font-size: 4rem; margin-bottom: 14px; position: relative; display: inline-block; filter: drop-shadow(0 0 24px rgba(220,56,45,0.5)); }
.hero-eyebrow { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--accent-2); margin-bottom: 12px; position: relative; }
.hero h1 { font-size: clamp(2rem, 5vw, 3.2rem); font-weight: 700; letter-spacing: -0.02em; position: relative; margin-bottom: 16px; }
.hero h1 span { color: var(--accent); }
.hero-sub { font-size: 0.98rem; color: var(--text-2); max-width: 520px; margin: 0 auto 28px; position: relative; }
.hero-chips { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; position: relative; }
.chip { background: rgba(220,56,45,0.08); border: 1px solid var(--border-bright); color: var(--text-2); font-size: 0.75rem; padding: 4px 12px; border-radius: 20px; font-family: var(--mono); }

/* ── Container (index) ── */
.container { max-width: 860px; margin: 0 auto; padding: 36px 24px 80px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 22px; margin-bottom: 14px; }
.card-list { list-style: none; }
.card-list li { border-bottom: 1px solid var(--border); }
.card-list li:last-child { border-bottom: none; }
.card-list a { display: flex; align-items: flex-start; gap: 14px; padding: 14px 10px; text-decoration: none; color: inherit; border-radius: var(--radius); transition: background 0.15s; }
.card-list a:hover { background: rgba(220,56,45,0.08); }
.list-num { width: 28px; height: 28px; background: var(--accent); color: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 0.72rem; font-weight: 700; flex-shrink: 0; font-family: var(--mono); }
.list-content { flex: 1; }
.list-title { font-size: 0.93rem; font-weight: 600; color: var(--text); margin-bottom: 3px; }
.list-desc { font-size: 0.8rem; color: var(--text-3); }
.list-chevron { color: var(--text-3); font-size: 1rem; align-self: center; }
.section-label { font-size: 0.68rem; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: var(--text-3); margin: 30px 0 10px 2px; }

/* ── Chapter Hero ── */
.chapter-hero { background: linear-gradient(135deg, #0d1117 0%, #161b22 50%, #21262d 100%); border-bottom: 1px solid var(--border-bright); color: var(--text); padding: 56px 24px 48px; text-align: center; position: relative; overflow: hidden; }
.chapter-hero::before { content: ''; position: absolute; inset: 0; background: radial-gradient(ellipse 60% 80% at 50% 0%, rgba(220,56,45,0.18) 0%, transparent 70%); pointer-events: none; }
.chapter-hero .ch-num { font-size: 0.68rem; letter-spacing: 0.22em; text-transform: uppercase; color: var(--accent-2); margin-bottom: 10px; font-family: var(--mono); position: relative; }
.chapter-hero h1 { font-size: clamp(1.7rem, 4vw, 2.5rem); font-weight: 700; margin-bottom: 12px; color: var(--text); position: relative; }
.chapter-hero p { color: var(--text-2); font-size: 0.93rem; max-width: 520px; margin: 0 auto; position: relative; }

/* ── Content ── */
.content { max-width: 760px; margin: 0 auto; padding: 44px 24px 80px; }
h2 { font-size: 1.35rem; font-weight: 700; color: var(--text); margin: 44px 0 14px; padding-bottom: 10px; border-bottom: 1px solid var(--border-bright); }
h2:first-child { margin-top: 0; }
h3 { font-size: 1.05rem; font-weight: 700; color: var(--text); margin: 28px 0 10px; }
h4 { font-size: 0.72rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-3); margin: 18px 0 8px; }
p { margin-bottom: 14px; color: var(--text-2); font-size: 0.93rem; line-height: 1.8; }

/* ── Callouts ── */
.callout { border-radius: var(--radius); padding: 14px 16px; margin: 18px 0; display: flex; gap: 12px; align-items: flex-start; font-size: 0.87rem; line-height: 1.65; border: 1px solid; }
.callout-icon { font-size: 1rem; flex-shrink: 0; margin-top: 2px; }
.callout p { margin: 0; color: inherit; font-size: inherit; }
.callout strong { display: block; margin-bottom: 3px; font-weight: 700; }
.callout.info { background: rgba(96,165,250,0.08); border-color: rgba(96,165,250,0.3); color: #93c5fd; }
.callout.tip { background: rgba(74,222,128,0.08); border-color: rgba(74,222,128,0.3); color: #86efac; }
.callout.warning { background: rgba(251,191,36,0.08); border-color: rgba(251,191,36,0.3); color: #fcd34d; }
.callout.danger { background: rgba(220,56,45,0.1); border-color: rgba(220,56,45,0.4); color: #fca5a5; }

/* ── Code ── */
pre { background: #090d12; color: var(--text); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 20px; overflow-x: auto; font-size: 0.84rem; line-height: 1.7; margin: 14px 0; position: relative; font-family: var(--mono); }
pre.no-prompt { }
pre .lang-label { position: absolute; top: 8px; right: 12px; font-size: 0.6rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: rgba(180,185,210,0.4); }
code { font-family: var(--mono); }
p code, li code, td code { background: rgba(220,56,45,0.12); color: var(--accent-2); padding: 2px 6px; border-radius: 4px; font-size: 0.85em; }

/* ── Code Highlight ── */
.kw  { color: #DC382D; font-weight: 700; }
.fn  { color: #fb923c; }
.st  { color: #4ade80; }
.cm  { color: #8b949e; font-style: italic; }
.ty  { color: #fbbf24; }
.nu  { color: #f9a8d4; }
.at  { color: #c084fc; }
.pr  { color: #60a5fa; }

/* ── Redis CLI style ── */
.redis-prompt { color: var(--accent-2); }
.redis-ok     { color: var(--green); }
.redis-int    { color: var(--nu, #f9a8d4); }
.redis-err    { color: var(--accent); }
.redis-bulk   { color: var(--text-2); }

/* ── Tables ── */
table { width: 100%; border-collapse: collapse; margin: 18px 0; font-size: 0.86rem; }
th { background: var(--card); color: var(--text-2); font-weight: 700; padding: 10px 14px; text-align: left; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; border-bottom: 1px solid var(--border-bright); }
td { padding: 10px 14px; border-top: 1px solid var(--border); color: var(--text-2); }
tr:hover td { background: rgba(220,56,45,0.04); }

/* ── Def List ── */
.def-list { list-style: none; }
.def-list li { padding: 12px 0; border-bottom: 1px solid var(--border); display: grid; grid-template-columns: 160px 1fr; gap: 16px; font-size: 0.88rem; }
.def-list li:last-child { border-bottom: none; }
.def-term { font-weight: 700; color: var(--accent-2); font-family: var(--mono); font-size: 0.83rem; }
.def-desc { color: var(--text-2); }

/* ── Progress ── */
.progress { height: 4px; background: var(--border); border-radius: 2px; margin-bottom: 32px; }
.progress-bar { height: 100%; background: linear-gradient(90deg, var(--accent), var(--orange)); border-radius: 2px; box-shadow: 0 0 8px rgba(220,56,45,0.4); }

/* ── Two-col ── */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 14px 0; }
.content ul, .content ol { padding-left: 22px; margin: 10px 0 14px; color: var(--text-2); font-size: 0.91rem; line-height: 1.85; }

/* ── Chapter Nav ── */
.chapter-nav { display: flex; gap: 12px; margin-top: 48px; padding-top: 22px; border-top: 1px solid var(--border); }
.chapter-nav a { flex: 1; display: flex; flex-direction: column; gap: 4px; padding: 14px; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); text-decoration: none; color: inherit; transition: border-color 0.2s, background 0.2s; }
.chapter-nav a:hover { border-color: var(--accent); background: var(--card-hover); }
.nav-dir { font-size: 0.7rem; color: var(--text-3); text-transform: uppercase; letter-spacing: 0.1em; }
.nav-title-text { font-weight: 600; color: var(--accent-2); font-size: 0.88rem; }
.prev { text-align: left; }
.next { text-align: right; }

/* ── Overview Grid ── */
.overview-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; margin: 14px 0; }
.overview-card { background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; transition: border-color 0.2s; }
.overview-card:hover { border-color: var(--border-bright); }
.overview-card .ov-icon { font-size: 1.4rem; margin-bottom: 8px; }
.overview-card h3 { font-size: 0.88rem; margin: 0 0 5px; color: var(--text); }
.overview-card p { font-size: 0.78rem; margin: 0; color: var(--text-3); line-height: 1.5; }

/* ── ASCII Diagram ── */
.ascii-diagram {
  background: #0d1117;
  border: 1px solid var(--border-bright);
  border-left: 3px solid var(--yellow);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin: 20px 0;
  font-family: var(--mono);
  font-size: 0.84rem;
  line-height: 2;
  overflow-x: auto;
  color: var(--text-2);
}
.ascii-diagram .d-label {
  display: block;
  color: var(--yellow);
  font-weight: 700;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: rgba(227,179,65,0.08);
  border-bottom: 1px solid rgba(227,179,65,0.2);
  margin: -16px -20px 14px -17px;
  padding: 7px 20px;
}
.ascii-diagram .d-box   { color: var(--accent-2); }
.ascii-diagram .d-arrow { color: var(--blue); }
.ascii-diagram .d-data  { color: var(--green); }
.ascii-diagram .d-note  { color: #8b949e; font-style: italic; }

/* ── Site Footer ── */
.site-footer { border-top: 1px solid var(--border); padding: 28px 24px; text-align: center; font-size: 0.78rem; color: var(--text-3); }
.site-footer a { color: var(--accent-2); text-decoration: none; }
.site-footer a:hover { color: var(--text); }

@media (max-width: 600px) {
  .two-col { grid-template-columns: 1fr; }
  .def-list li { grid-template-columns: 1fr; }
  .chapter-nav { flex-direction: column; }
}