/* 奇语 Qi 博客 —— 复用首页 index.html 的设计语言（朱砂 / 翡翠 / 宣纸） */
:root {
  --ink: #14110f;
  --ink-2: #1c1916;
  --ink-3: #26211d;
  --paper: #f4efe6;
  --paper-dim: #b8af9f;
  --cinnabar: #d6442f;
  --cinnabar-soft: #e8674f;
  --jade: #5cb494;
  --gold: #d4ac57;
  --line: rgba(244, 239, 230, 0.10);
  --surface-hi: rgba(244, 239, 230, 0.04);
  --nav-bg: rgba(20, 17, 15, 0.72);
  --on-cinnabar: #fdf2ee;
  --chip-bg: #f4efe6;
  --chip-fg: #14110f;
  --code-bg: #1c1916;
  --code-fg: #f4efe6;
  --code-line: rgba(244, 239, 230, 0.10);
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
  --display: "Fraunces", "Noto Serif SC", Georgia, "Songti SC", serif;
  --mono: "JetBrains Mono", "SF Mono", "Fira Code", ui-monospace, Menlo, Consolas, monospace;
  --sans: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC", "Segoe UI", sans-serif;
}
[data-theme="light"] {
  --ink: #f5efe3;
  --ink-2: #fffdf7;
  --ink-3: #ece4d4;
  --paper: #221c17;
  --paper-dim: #6e6457;
  --cinnabar: #c0392a;
  --cinnabar-soft: #d2543f;
  --jade: #2f7d60;
  --gold: #9a7a2c;
  --line: rgba(34, 28, 23, 0.13);
  --surface-hi: rgba(34, 28, 23, 0.03);
  --nav-bg: rgba(245, 239, 227, 0.82);
  --on-cinnabar: #fdf2ee;
  --chip-bg: #221c17;
  --chip-fg: #f5efe3;
  --shadow: 0 22px 50px rgba(96, 70, 40, 0.16);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--ink); color: var(--paper);
  font-family: var(--sans); line-height: 1.75;
  -webkit-font-smoothing: antialiased; overflow-x: hidden;
}
::selection { background: var(--cinnabar); color: var(--on-cinnabar); }
a { color: inherit; text-decoration: none; }
body, nav, .post-card, .code-card { transition: background .35s ease, color .35s ease, border-color .35s ease; }
.wrap { max-width: 820px; margin: 0 auto; padding: 0 24px; }
.wrap-wide { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* ---------- nav ---------- */
nav {
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: blur(14px); background: var(--nav-bg);
  border-bottom: 1px solid var(--line);
}
nav .wrap-wide { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 12px; font-weight: 700; font-size: 19px; letter-spacing: .5px; }
.brand .seal {
  width: 36px; height: 36px; border-radius: 9px; display: grid; place-items: center;
  background: var(--cinnabar); color: var(--on-cinnabar);
  font-family: var(--display); font-size: 23px; font-weight: 800;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.14), 0 6px 18px rgba(214,68,47,0.32);
}
.nav-links { display: flex; gap: 28px; align-items: center; font-size: 14.5px; }
.nav-links a { color: var(--paper-dim); transition: color .2s; white-space: nowrap; }
.nav-links a:hover, .nav-links a.active { color: var(--paper); }
.nav-cta { background: var(--chip-bg); color: var(--chip-fg) !important; padding: 8px 16px; border-radius: 8px; font-weight: 700; transition: transform .15s, box-shadow .2s; }
.nav-cta:hover { transform: translateY(-1px); box-shadow: 0 8px 20px rgba(0,0,0,.28); }
.theme-toggle { width: 38px; height: 38px; border-radius: 9px; cursor: pointer; display: grid; place-items: center; font-size: 17px; line-height: 1; background: transparent; border: 1px solid var(--line); color: var(--paper); transition: border-color .2s, transform .15s; }
.theme-toggle:hover { border-color: var(--paper-dim); transform: translateY(-1px); }
.theme-toggle .sun { display: none; }
[data-theme="light"] .theme-toggle .sun { display: block; }
[data-theme="light"] .theme-toggle .moon { display: none; }
@media (max-width: 720px) { .nav-links { gap: 16px; } .nav-links a:not(.nav-cta):not(.keep) { display: none; } }

/* ---------- blog index ---------- */
.blog-hero { padding: 80px 0 30px; }
.blog-hero .sec-tag { font-size: 13px; letter-spacing: 1.5px; text-transform: uppercase; color: var(--cinnabar); font-weight: 700; }
.blog-hero h1 { font-family: var(--display); font-size: clamp(38px, 6vw, 64px); font-weight: 800; letter-spacing: -1.5px; margin: 12px 0 16px; }
.blog-hero p { color: var(--paper-dim); font-size: 18px; max-width: 620px; }
.post-list { display: grid; gap: 18px; padding: 30px 0 100px; }
.post-card {
  display: block; background: var(--ink-2); border: 1px solid var(--line);
  border-radius: 14px; padding: 28px 28px; transition: transform .2s, border-color .2s;
}
.post-card:hover { transform: translateY(-4px); border-color: rgba(214,68,47,.4); }
.post-card .tag { font-family: var(--mono); font-size: 12.5px; color: var(--cinnabar-soft); }
.post-card .tag .dot { color: var(--paper-dim); margin: 0 8px; }
.post-card h2 { font-family: var(--display); font-size: 25px; font-weight: 700; letter-spacing: -.4px; margin: 10px 0 8px; }
.post-card p { color: var(--paper-dim); font-size: 15px; }
.post-card .more { color: var(--cinnabar-soft); font-size: 14px; margin-top: 14px; display: inline-block; }

/* ---------- post page ---------- */
.post { padding: 56px 0 40px; }
.post-meta { font-family: var(--mono); font-size: 13px; color: var(--cinnabar-soft); }
.post-meta .dot { color: var(--paper-dim); margin: 0 8px; }
.post h1 { font-family: var(--display); font-size: clamp(32px, 5vw, 50px); font-weight: 800; letter-spacing: -1.2px; line-height: 1.08; margin: 14px 0 16px; }
.post .lede { font-size: 19px; color: var(--paper-dim); line-height: 1.7; }
.post-body { padding-bottom: 90px; }
.post-body h2 { font-family: var(--display); font-size: 28px; font-weight: 700; letter-spacing: -.5px; margin: 52px 0 14px; padding-top: 8px; }
.post-body h3 { font-family: var(--display); font-size: 21px; font-weight: 600; margin: 34px 0 10px; }
.post-body p { font-size: 16.5px; color: var(--paper); margin: 16px 0; }
.post-body ul, .post-body ol { margin: 16px 0 16px 26px; color: var(--paper); }
.post-body li { margin: 7px 0; font-size: 16.5px; }
.post-body a { color: var(--cinnabar-soft); border-bottom: 1px solid rgba(214,68,47,.3); }
.post-body a:hover { border-bottom-color: var(--cinnabar-soft); }
.post-body strong { color: var(--paper); font-weight: 700; }
.post-body p code, .post-body li code {
  font-family: var(--mono); font-size: 14px; background: var(--surface-hi);
  border: 1px solid var(--line); border-radius: 5px; padding: 1px 6px; color: var(--cinnabar-soft);
}
.post-body blockquote {
  margin: 22px 0; padding: 14px 20px; border-left: 3px solid var(--cinnabar);
  background: var(--surface-hi); border-radius: 0 8px 8px 0; color: var(--paper-dim);
}
.callout {
  margin: 22px 0; padding: 16px 20px; border: 1px solid var(--line);
  border-radius: 12px; background: var(--surface-hi); font-size: 15px; color: var(--paper-dim);
}
.callout strong { color: var(--gold); }

/* ---------- code cards (与首页一致) ---------- */
.code-card { background: var(--code-bg); color: var(--code-fg); border: 1px solid var(--code-line); border-radius: 14px; overflow: hidden; margin: 22px 0; }
.code-card .bar { display: flex; align-items: center; gap: 8px; padding: 12px 16px; border-bottom: 1px solid var(--code-line); }
.code-card .bar .dots { display: flex; gap: 6px; }
.code-card .bar .dots i { width: 11px; height: 11px; border-radius: 50%; display: block; }
.code-card .bar .dots i:nth-child(1) { background: #e05c4a; }
.code-card .bar .dots i:nth-child(2) { background: var(--gold); }
.code-card .bar .dots i:nth-child(3) { background: var(--jade); }
.code-card .bar .fname { font-family: var(--mono); font-size: 12.5px; color: var(--paper-dim); margin-left: 6px; }
.code-card .bar .copy-btn { margin-left: auto; cursor: pointer; color: #b3a99a; background: none; border: none; font-family: var(--sans); font-size: 12.5px; }
.code-card .bar .copy-btn:hover { color: var(--code-fg); }
pre { margin: 0; padding: 20px; overflow-x: auto; font-family: var(--mono); font-size: 13.5px; line-height: 1.7; }
code.block { display: block; white-space: pre; }
.kw { color: var(--cinnabar-soft); }
.ty { color: var(--gold); }
.str { color: var(--jade); }
.fn { color: #7cb3e8; }
.cm { color: #6b6258; font-style: italic; }
.num2 { color: #c98bd6; }
.out { color: var(--jade); }

/* ---------- footer ---------- */
footer { border-top: 1px solid var(--line); padding: 44px 0; color: var(--paper-dim); font-size: 14px; }
footer .wrap-wide { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 16px; align-items: center; }
footer a { color: var(--paper-dim); transition: color .2s; }
footer a:hover { color: var(--paper); }
.foot-links { display: flex; gap: 22px; }

.gsap-ready .reveal { opacity: 0; }

.diagram { display:block; width:100%; max-width:840px; margin:24px auto; border-radius:14px; }
.diagram-full { display:block; width:100%; max-width:1100px; margin:32px auto; border-radius:14px; }