/* ==========================================================================
   EZCAI DataAlgorithm — 数据与算法研究栏目
   设计基线：继承主站深色系（#0A0A0F / #050509），模块识别色改用学术冷调青蓝，
             与主站琥珀 --accent 形成层级区分，但共用间距/圆角/阴影语言。
   Part 1/3 — 变量 · 基础排版 · 导航 · Hero
   ========================================================================== */

:root {
  /* ── 模块识别色：青蓝学术冷调 ───────────────────────────────── */
  --algo-bg:          #07070C;
  --algo-bg-alt:      #0D0D14;
  --algo-surface:     rgba(19, 21, 32, 0.72);
  --algo-surface-sol: #13151F;
  --algo-fg:          #F2F4F8;
  --algo-muted:       #8A93A6;
  --algo-dim:         #5C6478;

  --algo-cyan:        #22D3EE;
  --algo-cyan-dim:    #0E7490;
  --algo-indigo:      #6366F1;
  --algo-mint:        #34D399;
  --algo-amber:       #F59E0B;

  --algo-border:      rgba(255, 255, 255, 0.075);
  --algo-border-hi:   rgba(34, 211, 238, 0.28);
  --algo-grid:        rgba(255, 255, 255, 0.045);

  --algo-radius-sm:   6px;
  --algo-radius:      12px;
  --algo-radius-lg:   18px;

  --algo-shadow:      0 18px 48px rgba(0, 0, 0, 0.42);
  --algo-glow:        0 0 0 1px rgba(34, 211, 238, 0.24), 0 0 34px rgba(34, 211, 238, 0.12);

  --algo-mono:        ui-monospace, "SF Mono", "JetBrains Mono", "Cascadia Code", Consolas, monospace;
  --algo-sans:        Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                     "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --algo-serif:       "Source Serif 4", Georgia, "Songti SC", "Noto Serif CJK SC", serif;

  /* 正文测量：学术长文以 68-72 字符为最佳行长 */
  --algo-measure:     min(72ch, 100%);
  --algo-shell:       min(1180px, 100%);
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body.algo-page {
  margin: 0;
  background: var(--algo-bg);
  color: var(--algo-fg);
  font-family: var(--algo-sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* 背景：极淡的坐标网格，暗示"数据"主题，不干扰阅读 */
body.algo-page::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background-image:
    linear-gradient(var(--algo-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--algo-grid) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 20%, transparent 78%);
  pointer-events: none;
}

body.algo-page::after {
  content: "";
  position: fixed;
  inset: -30% -10% auto auto;
  width: 720px; height: 520px;
  z-index: -3;
  background: radial-gradient(circle, rgba(34, 211, 238, 0.13), rgba(34, 211, 238, 0) 64%);
  pointer-events: none;
}

.algo-shell { width: var(--algo-shell); margin: 0 auto; padding: 0 clamp(1rem, 4vw, 2rem); }

a { color: var(--algo-cyan); text-decoration: none; transition: color .18s ease; }
a:hover, a:focus-visible { color: #67E8F9; outline: 0; }

:focus-visible { outline: 2px solid var(--algo-cyan); outline-offset: 3px; border-radius: 3px; }

/* ── 顶部导航 ─────────────────────────────────────────────────── */
.algo-topbar {
  position: sticky; top: 0; z-index: 40;
  background: rgba(7, 7, 12, 0.82);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--algo-border);
}

.algo-topbar__inner {
  width: var(--algo-shell); margin: 0 auto;
  padding: 0 clamp(1rem, 4vw, 2rem);
  min-height: 62px;
  display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
}

.algo-brand { display: inline-flex; align-items: center; gap: 11px; color: var(--algo-fg); }
.algo-brand__mark {
  display: grid; place-items: center;
  width: 34px; height: 34px; border-radius: 10px;
  background: linear-gradient(135deg, var(--algo-cyan), var(--algo-indigo));
  color: #05070D; font-weight: 900; font-size: 13px; letter-spacing: -.04em;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, .14), 0 10px 28px rgba(34, 211, 238, .26);
}
.algo-brand__text { display: flex; flex-direction: column; line-height: 1.15; }
.algo-brand__text b { font-size: .95rem; letter-spacing: -.02em; }
.algo-brand__text small { color: var(--algo-dim); font-size: .68rem; letter-spacing: .1em; text-transform: uppercase; }

.algo-nav { display: flex; align-items: center; gap: 4px; margin-left: auto; flex-wrap: wrap; }
.algo-nav a {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 7px 12px; border-radius: 8px;
  color: var(--algo-muted); font-size: .85rem; font-weight: 600;
  border: 1px solid transparent; transition: all .18s ease;
}
.algo-nav a:hover, .algo-nav a:focus-visible {
  color: var(--algo-fg); background: rgba(255, 255, 255, .05); border-color: var(--algo-border);
}
.algo-nav a.is-active { color: var(--algo-cyan); border-color: var(--algo-border-hi); background: rgba(34, 211, 238, .07); }
.algo-nav a.algo-nav__home { color: rgba(255, 255, 255, .58); }

/* ── Hero ─────────────────────────────────────────────────────── */
.algo-hero { padding: clamp(52px, 9vw, 96px) 0 clamp(34px, 5vw, 54px); }

.algo-hero__eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 5px 12px; margin-bottom: 22px;
  border-radius: 999px;
  background: rgba(34, 211, 238, .08);
  border: 1px solid var(--algo-border-hi);
  color: var(--algo-cyan);
  font-family: var(--algo-mono); font-size: .7rem; font-weight: 700;
  letter-spacing: .16em; text-transform: uppercase;
}

.algo-hero h1 {
  margin: 0 0 18px;
  max-width: 22ch;
  font-size: clamp(2.1rem, 5.4vw, 3.6rem);
  line-height: 1.08; letter-spacing: -.035em; font-weight: 800;
}
.algo-hero h1 em {
  font-style: normal;
  background: linear-gradient(120deg, var(--algo-cyan), var(--algo-indigo) 62%, var(--algo-mint));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}

.algo-hero__lede {
  max-width: 62ch; margin: 0 0 30px;
  color: var(--algo-muted); font-size: clamp(1rem, 1.5vw, 1.12rem); line-height: 1.8;
}

.algo-hero__metrics {
  display: grid; gap: 1px;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  background: var(--algo-border);
  border: 1px solid var(--algo-border);
  border-radius: var(--algo-radius);
  overflow: hidden;
}
.algo-hero__metrics div { padding: 18px 20px; background: var(--algo-bg-alt); }
.algo-hero__metrics b {
  display: block;
  font-family: var(--algo-mono); font-size: clamp(1.5rem, 3vw, 1.95rem);
  font-weight: 800; letter-spacing: -.03em; color: var(--algo-cyan);
}
.algo-hero__metrics span {
  display: block; margin-top: 4px;
  color: var(--algo-dim); font-size: .74rem; font-weight: 600;
  letter-spacing: .09em; text-transform: uppercase;
}
/* ==========================================================================
   EZCAI DataAlgorithm — Part 2/3 — 文章排版 · 学术组件族
   .algo-article 内的排版按学术论文规范：正文衬线、公式独立居中、
   定理/引理框带左侧强调条、参数表等宽数字对齐。
   ========================================================================== */

/* ── 文章骨架：正文列 + 右侧目录 ────────────────────────────── */
.algo-article-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 232px;
  gap: clamp(28px, 5vw, 64px);
  align-items: start;
  padding: clamp(28px, 5vw, 48px) 0 80px;
}

/* ── 论文头部（Article Header）────────────────────────────────── */
.algo-paper-head { padding-bottom: 30px; margin-bottom: 38px; border-bottom: 1px solid var(--algo-border); }

.algo-paper-head__tags { display: flex; flex-wrap: wrap; gap: 7px; margin-bottom: 18px; }
.algo-tag {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 4px 10px; border-radius: 999px;
  background: rgba(255, 255, 255, .05);
  border: 1px solid var(--algo-border);
  color: var(--algo-muted);
  font-family: var(--algo-mono); font-size: .68rem; font-weight: 700;
  letter-spacing: .08em; text-transform: uppercase;
}
.algo-tag--cyan   { background: rgba(34, 211, 238, .09); border-color: var(--algo-border-hi); color: var(--algo-cyan); }
.algo-tag--indigo { background: rgba(99, 102, 241, .11); border-color: rgba(99, 102, 241, .3); color: #A5B4FC; }
.algo-tag--mint   { background: rgba(52, 211, 153, .10); border-color: rgba(52, 211, 153, .28); color: #6EE7B7; }
.algo-tag--amber  { background: rgba(245, 158, 11, .10); border-color: rgba(245, 158, 11, .28); color: #FCD34D; }

.algo-paper-head h1 {
  margin: 0 0 16px;
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  line-height: 1.16; letter-spacing: -.03em; font-weight: 800;
}

.algo-paper-head__abstract {
  margin: 0 0 22px; padding: 18px 22px;
  max-width: var(--algo-measure);
  background: var(--algo-surface);
  border: 1px solid var(--algo-border);
  border-left: 3px solid var(--algo-cyan);
  border-radius: 0 var(--algo-radius) var(--algo-radius) 0;
  color: rgba(242, 244, 248, .82);
  font-size: .95rem; line-height: 1.82;
}
.algo-paper-head__abstract b {
  display: block; margin-bottom: 6px;
  color: var(--algo-cyan);
  font-family: var(--algo-mono); font-size: .7rem; font-weight: 700;
  letter-spacing: .16em; text-transform: uppercase;
}

/* 作者/日期/阅读时长元信息行 */
.algo-paper-head__meta {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px 18px;
  color: var(--algo-dim); font-size: .8rem;
}
.algo-paper-head__meta span { display: inline-flex; align-items: center; gap: 6px; }
.algo-paper-head__meta time { font-family: var(--algo-mono); color: var(--algo-muted); }

/* ── 正文排版 ─────────────────────────────────────────────────── */
.algo-article { max-width: var(--algo-measure); }

.algo-article h2 {
  margin: 52px 0 16px; padding-top: 6px;
  font-size: clamp(1.28rem, 2.4vw, 1.62rem);
  line-height: 1.3; letter-spacing: -.02em; font-weight: 800;
  scroll-margin-top: 84px;
}
/* 章节编号：CSS 计数器自动编号，符合论文习惯 */
.algo-article { counter-reset: algosec; }
.algo-article h2::before {
  counter-increment: algosec;
  content: counter(algosec) ". ";
  color: var(--algo-cyan); font-family: var(--algo-mono); font-weight: 700;
}

.algo-article h3 {
  margin: 34px 0 12px;
  font-size: 1.06rem; line-height: 1.4; font-weight: 700;
  color: rgba(242, 244, 248, .93);
  scroll-margin-top: 84px;
}

.algo-article p {
  margin: 0 0 20px;
  font-family: var(--algo-serif);
  font-size: 1.05rem; line-height: 1.85;
  color: rgba(242, 244, 248, .87);
}

.algo-article ul, .algo-article ol { margin: 0 0 22px; padding-left: 1.35rem; }
.algo-article li {
  margin-bottom: 9px;
  font-family: var(--algo-serif); font-size: 1.02rem; line-height: 1.8;
  color: rgba(242, 244, 248, .84);
}
.algo-article li::marker { color: var(--algo-cyan); font-weight: 700; }

.algo-article strong { color: #FFF; font-weight: 700; }

/* 行内代码与行内公式 */
.algo-article code:not(pre code) {
  padding: 2px 6px; border-radius: 5px;
  background: rgba(34, 211, 238, .09);
  border: 1px solid rgba(34, 211, 238, .18);
  color: #67E8F9;
  font-family: var(--algo-mono); font-size: .88em;
}
.algo-var { font-family: var(--algo-serif); font-style: italic; color: #A5B4FC; }

/* ── 公式块（零依赖：MathML + 语义化降级）───────────────────── */
.algo-eq {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center; gap: 16px;
  margin: 28px 0; padding: 22px 24px;
  background: linear-gradient(180deg, rgba(19, 21, 32, .9), rgba(13, 13, 20, .9));
  border: 1px solid var(--algo-border);
  border-radius: var(--algo-radius);
  overflow-x: auto;
}
.algo-eq__body {
  font-family: var(--algo-serif); font-size: clamp(1.05rem, 2.1vw, 1.28rem);
  line-height: 1.9; color: #F2F4F8; text-align: center;
}
.algo-eq__body math { font-size: 1.12em; }
.algo-eq__no {
  font-family: var(--algo-mono); font-size: .82rem; font-weight: 700;
  color: var(--algo-cyan); white-space: nowrap;
}
.algo-eq__note {
  grid-column: 1 / -1; margin: 6px 0 0; padding-top: 12px;
  border-top: 1px dashed var(--algo-border);
  color: var(--algo-dim); font-size: .82rem; line-height: 1.7; text-align: left;
}

/* ── 定理 / 引理 / 定义 框 ───────────────────────────────────── */
.algo-thm {
  margin: 26px 0; padding: 18px 22px;
  background: var(--algo-surface);
  border: 1px solid var(--algo-border);
  border-left: 3px solid var(--algo-indigo);
  border-radius: 0 var(--algo-radius) var(--algo-radius) 0;
}
.algo-thm__label {
  display: block; margin-bottom: 8px;
  color: #A5B4FC;
  font-family: var(--algo-mono); font-size: .72rem; font-weight: 800;
  letter-spacing: .13em; text-transform: uppercase;
}
.algo-thm p { margin: 0 0 10px; font-size: 1rem; }
.algo-thm p:last-child { margin-bottom: 0; }
.algo-thm--def   { border-left-color: var(--algo-cyan); }
.algo-thm--def   .algo-thm__label { color: var(--algo-cyan); }
.algo-thm--warn  { border-left-color: var(--algo-amber); background: rgba(245, 158, 11, .05); }
.algo-thm--warn  .algo-thm__label { color: #FCD34D; }
.algo-thm--proof { border-left-color: var(--algo-mint); }
.algo-thm--proof .algo-thm__label { color: #6EE7B7; }
/* 证明结束符 ∎ */
.algo-thm--proof > p:last-of-type::after { content: " ∎"; color: var(--algo-mint); font-weight: 700; }

/* ── 代码块 ───────────────────────────────────────────────────── */
.algo-code {
  margin: 26px 0;
  background: #05060B;
  border: 1px solid var(--algo-border);
  border-radius: var(--algo-radius);
  overflow: hidden;
}
.algo-code__bar {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 9px 16px;
  background: rgba(255, 255, 255, .028);
  border-bottom: 1px solid var(--algo-border);
}
.algo-code__lang {
  color: var(--algo-cyan);
  font-family: var(--algo-mono); font-size: .7rem; font-weight: 700;
  letter-spacing: .12em; text-transform: uppercase;
}
.algo-code__cap { color: var(--algo-dim); font-size: .74rem; }
.algo-code pre { margin: 0; padding: 18px; overflow-x: auto; }
.algo-code code {
  font-family: var(--algo-mono); font-size: .84rem; line-height: 1.75;
  color: #C9D3E4; white-space: pre;
}

/* ── 数据表（参数表 / 结果对比表）────────────────────────────── */
.algo-table-wrap { margin: 26px 0; overflow-x: auto; border: 1px solid var(--algo-border); border-radius: var(--algo-radius); }
.algo-table { width: 100%; border-collapse: collapse; font-size: .88rem; }
.algo-table caption {
  padding: 12px 16px; text-align: left;
  background: rgba(255, 255, 255, .028);
  border-bottom: 1px solid var(--algo-border);
  color: var(--algo-muted); font-size: .78rem; font-weight: 600;
}
.algo-table caption b { color: var(--algo-cyan); font-family: var(--algo-mono); letter-spacing: .08em; }
.algo-table th {
  padding: 11px 14px; text-align: left;
  background: rgba(255, 255, 255, .04);
  border-bottom: 1px solid var(--algo-border);
  color: rgba(255, 255, 255, .72);
  font-size: .73rem; font-weight: 800; letter-spacing: .09em; text-transform: uppercase;
  white-space: nowrap;
}
.algo-table td {
  padding: 11px 14px;
  border-bottom: 1px solid rgba(255, 255, 255, .045);
  color: rgba(242, 244, 248, .84); vertical-align: top;
}
.algo-table tbody tr:last-child td { border-bottom: 0; }
.algo-table tbody tr:hover td { background: rgba(34, 211, 238, .035); }
/* 数字列：等宽 + 表格数字对齐 */
.algo-table .num { font-family: var(--algo-mono); font-variant-numeric: tabular-nums; text-align: right; white-space: nowrap; }
.algo-table .best { color: var(--algo-mint); font-weight: 700; }
.algo-table .worst { color: #FCA5A5; }

/* ── 关键结论卡（Takeaway）───────────────────────────────────── */
.algo-takeaway {
  margin: 34px 0; padding: 22px 24px;
  background: linear-gradient(135deg, rgba(34, 211, 238, .075), rgba(99, 102, 241, .06));
  border: 1px solid var(--algo-border-hi);
  border-radius: var(--algo-radius);
  box-shadow: var(--algo-glow);
}
.algo-takeaway__label {
  display: block; margin-bottom: 12px;
  color: var(--algo-cyan);
  font-family: var(--algo-mono); font-size: .72rem; font-weight: 800;
  letter-spacing: .16em; text-transform: uppercase;
}
.algo-takeaway ol { margin: 0; padding-left: 1.3rem; }
.algo-takeaway li { color: rgba(242, 244, 248, .9); font-family: var(--algo-sans); font-size: .95rem; }

/* ── 参考文献 ─────────────────────────────────────────────────── */
.algo-refs { margin: 48px 0 0; padding-top: 26px; border-top: 1px solid var(--algo-border); }
.algo-refs h2 { margin-top: 0; }
.algo-refs h2::before { content: none; }
.algo-refs ol { padding-left: 1.5rem; }
.algo-refs li {
  margin-bottom: 12px;
  font-family: var(--algo-sans); font-size: .86rem; line-height: 1.7;
  color: var(--algo-muted);
}
.algo-refs li em { color: rgba(255, 255, 255, .78); font-style: italic; }
.algo-refs a { word-break: break-word; }

/* ── 右侧目录（TOC）──────────────────────────────────────────── */
.algo-toc { position: sticky; top: 86px; align-self: start; }
.algo-toc__title {
  margin: 0 0 12px;
  color: var(--algo-dim);
  font-family: var(--algo-mono); font-size: .68rem; font-weight: 800;
  letter-spacing: .16em; text-transform: uppercase;
}
.algo-toc nav { display: flex; flex-direction: column; gap: 2px; border-left: 1px solid var(--algo-border); }
.algo-toc a {
  padding: 6px 12px; margin-left: -1px;
  border-left: 2px solid transparent;
  color: var(--algo-muted); font-size: .82rem; line-height: 1.45;
  transition: all .18s ease;
}
.algo-toc a:hover { color: var(--algo-fg); border-left-color: var(--algo-border-hi); }
.algo-toc a.is-active { color: var(--algo-cyan); border-left-color: var(--algo-cyan); background: rgba(34, 211, 238, .05); }
.algo-toc a[data-depth="3"] { padding-left: 24px; font-size: .78rem; }
/* ==========================================================================
   EZCAI DataAlgorithm — Part 3/3 — Hub 卡片墙 · 页脚 · 响应式 · 无障碍
   ========================================================================== */

/* ── 区块标题 ─────────────────────────────────────────────────── */
.algo-section { padding: clamp(38px, 6vw, 62px) 0 0; }
.algo-section__head {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 16px; flex-wrap: wrap; margin-bottom: 24px;
  padding-bottom: 14px; border-bottom: 1px solid var(--algo-border);
}
.algo-section__head h2 {
  margin: 0; font-size: clamp(1.2rem, 2.6vw, 1.55rem);
  letter-spacing: -.02em; font-weight: 800;
}
.algo-section__head h2 small {
  display: block; margin-top: 5px;
  color: var(--algo-dim);
  font-family: var(--algo-mono); font-size: .7rem; font-weight: 600;
  letter-spacing: .14em; text-transform: uppercase;
}
.algo-section__more { color: var(--algo-cyan); font-size: .85rem; font-weight: 700; white-space: nowrap; }

/* ── 分类导航（Category rail）────────────────────────────────── */
.algo-cats { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 30px; }
.algo-cats a {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 8px 14px; border-radius: 999px;
  background: rgba(255, 255, 255, .04);
  border: 1px solid var(--algo-border);
  color: var(--algo-muted); font-size: .84rem; font-weight: 600;
  transition: all .18s ease;
}
.algo-cats a:hover, .algo-cats a:focus-visible {
  color: var(--algo-fg); border-color: var(--algo-border-hi); background: rgba(34, 211, 238, .07);
}
.algo-cats a b { font-family: var(--algo-mono); font-size: .74rem; color: var(--algo-cyan); }

/* ── 文章卡片网格 ─────────────────────────────────────────────── */
.algo-grid {
  display: grid; gap: 16px;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 322px), 1fr));
}

.algo-card {
  display: flex; flex-direction: column; gap: 11px;
  padding: 22px;
  background: var(--algo-surface);
  border: 1px solid var(--algo-border);
  border-radius: var(--algo-radius);
  transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease;
}
.algo-card:hover, .algo-card:focus-within {
  border-color: var(--algo-border-hi);
  transform: translateY(-3px);
  box-shadow: var(--algo-shadow), var(--algo-glow);
}

.algo-card__head { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.algo-card__no {
  font-family: var(--algo-mono); font-size: .7rem; font-weight: 800;
  letter-spacing: .1em; color: var(--algo-dim);
}
.algo-card h3 { margin: 0; font-size: 1.04rem; line-height: 1.42; letter-spacing: -.015em; font-weight: 700; }
.algo-card h3 a { color: var(--algo-fg); }
.algo-card h3 a:hover { color: var(--algo-cyan); }
.algo-card p { margin: 0; color: var(--algo-muted); font-size: .87rem; line-height: 1.72; }
.algo-card__foot {
  display: flex; align-items: center; gap: 8px 14px; flex-wrap: wrap;
  margin-top: auto; padding-top: 12px; border-top: 1px solid var(--algo-border);
  color: var(--algo-dim); font-size: .74rem;
}
.algo-card__foot time { font-family: var(--algo-mono); }

/* 状态徽标 */
.algo-badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 3px 8px; border-radius: 5px;
  font-family: var(--algo-mono); font-size: .64rem; font-weight: 800;
  letter-spacing: .1em; text-transform: uppercase;
}
.algo-badge--new     { background: rgba(52, 211, 153, .13); color: #6EE7B7; }
.algo-badge--draft   { background: rgba(245, 158, 11, .13); color: #FCD34D; }
.algo-badge--planned { background: rgba(255, 255, 255, .06); color: var(--algo-dim); }

/* 未上线卡片降饱和 */
.algo-card.is-planned { opacity: .58; }
.algo-card.is-planned:hover { opacity: .82; transform: none; box-shadow: none; }

/* ── 精选长文（Featured）────────────────────────────────────── */
.algo-feature {
  display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: clamp(20px, 4vw, 44px); align-items: center;
  padding: clamp(24px, 4vw, 36px);
  background: linear-gradient(135deg, rgba(34, 211, 238, .06), rgba(99, 102, 241, .05));
  border: 1px solid var(--algo-border-hi);
  border-radius: var(--algo-radius-lg);
}
.algo-feature h3 { margin: 12px 0 14px; font-size: clamp(1.25rem, 2.8vw, 1.72rem); line-height: 1.24; letter-spacing: -.025em; font-weight: 800; }
.algo-feature h3 a { color: var(--algo-fg); }
.algo-feature h3 a:hover { color: var(--algo-cyan); }
.algo-feature p { margin: 0 0 18px; color: rgba(242, 244, 248, .78); font-size: .95rem; line-height: 1.8; }
.algo-feature__cta {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 18px; border-radius: 9px;
  background: rgba(34, 211, 238, .12);
  border: 1px solid var(--algo-border-hi);
  color: var(--algo-cyan); font-size: .87rem; font-weight: 700;
  transition: all .18s ease;
}
.algo-feature__cta:hover { background: rgba(34, 211, 238, .2); color: #A5F3FC; }

/* 精选侧：公式预览面板 */
.algo-feature__eq {
  padding: 20px; border-radius: var(--algo-radius);
  background: rgba(5, 6, 11, .62);
  border: 1px solid var(--algo-border);
  font-family: var(--algo-serif); font-size: 1.08rem; line-height: 2;
  color: rgba(242, 244, 248, .9); text-align: center;
  overflow-x: auto;
}

/* ── 免责声明条 ─────────────────────────────────────────────── */
.algo-disclaimer {
  margin: clamp(40px, 6vw, 64px) 0 0; padding: 16px 20px;
  background: rgba(245, 158, 11, .055);
  border: 1px solid rgba(245, 158, 11, .2);
  border-radius: var(--algo-radius);
  color: rgba(253, 230, 138, .88); font-size: .82rem; line-height: 1.72;
}
.algo-disclaimer b { color: #FCD34D; }

/* ── 页脚 ─────────────────────────────────────────────────────── */
.algo-footer {
  margin-top: clamp(52px, 8vw, 84px);
  padding: clamp(38px, 6vw, 56px) 0 30px;
  background: #050509;
  border-top: 1px solid var(--algo-border);
}
.algo-footer__grid {
  display: grid; gap: clamp(24px, 4vw, 44px);
  grid-template-columns: minmax(240px, .9fr) minmax(0, 1.8fr);
  align-items: start;
}
.algo-footer__about p { margin: 16px 0 0; max-width: 32rem; color: rgba(255, 255, 255, .6); font-size: .9rem; line-height: 1.8; }
.algo-footer__nav { display: grid; gap: clamp(18px, 3vw, 34px); grid-template-columns: repeat(3, minmax(0, 1fr)); }
.algo-footer__nav section { display: flex; flex-direction: column; gap: 10px; min-width: 0; }
.algo-footer__nav h2 {
  margin: 0 0 5px; color: rgba(255, 255, 255, .4);
  font-size: .67rem; font-weight: 800; letter-spacing: .16em; text-transform: uppercase;
}
.algo-footer__nav a { width: max-content; max-width: 100%; color: rgba(255, 255, 255, .74); font-size: .86rem; }
.algo-footer__nav a:hover { color: #FFF; }
.algo-footer__bottom {
  display: flex; justify-content: space-between; align-items: center;
  gap: 16px; flex-wrap: wrap;
  margin-top: 42px; padding-top: 22px;
  border-top: 1px solid var(--algo-border);
  color: rgba(255, 255, 255, .42); font-size: .77rem;
}
.algo-footer__bottom p { margin: 0; }
.algo-footer__bottom nav { display: flex; gap: 14px; flex-wrap: wrap; }
.algo-footer__bottom a { color: rgba(255, 255, 255, .55); }
.algo-footer__bottom a:hover { color: #FFF; }

/* ── 跳转到正文（无障碍）────────────────────────────────────── */
.algo-skip {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  padding: 10px 16px; border-radius: 0 0 8px 0;
  background: var(--algo-cyan); color: #05070D; font-weight: 700;
}
.algo-skip:focus { left: 0; }

/* ── 入场动效（可关闭）──────────────────────────────────────── */
.algo-reveal { opacity: 0; transform: translateY(14px); transition: opacity .55s ease, transform .55s ease; }
.algo-reveal.in { opacity: 1; transform: none; }

/* ── 响应式 ───────────────────────────────────────────────────── */
@media (max-width: 1080px) {
  .algo-article-wrap { grid-template-columns: 1fr; }
  .algo-toc { position: static; order: -1; padding: 16px 18px; background: var(--algo-surface); border: 1px solid var(--algo-border); border-radius: var(--algo-radius); }
  .algo-toc nav { border-left: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 4px; }
  .algo-toc a { border-left: 0; border-bottom: 2px solid transparent; padding-left: 0; }
  .algo-toc a:hover, .algo-toc a.is-active { border-left: 0; border-bottom-color: var(--algo-cyan); background: none; }
  .algo-toc a[data-depth="3"] { padding-left: 14px; }
}

@media (max-width: 900px) {
  .algo-feature { grid-template-columns: 1fr; }
  .algo-footer__grid { grid-template-columns: 1fr; }
  .algo-footer__nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  body.algo-page { font-size: 15.5px; }
  .algo-topbar__inner { min-height: 56px; padding-block: 8px; }
  .algo-nav { width: 100%; margin-left: 0; overflow-x: auto; padding-bottom: 4px; }
  .algo-nav a { white-space: nowrap; }
  .algo-article p, .algo-article li { font-size: 1rem; }
  .algo-eq { grid-template-columns: 1fr; padding: 18px; }
  .algo-eq__no { text-align: right; }
  .algo-footer__nav { grid-template-columns: 1fr; }
  .algo-footer__bottom { flex-direction: column; align-items: flex-start; }
}

/* ── 无障碍：尊重系统减少动效偏好 ──────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; transition-duration: .001ms !important; }
  .algo-reveal { opacity: 1; transform: none; }
  .algo-card:hover { transform: none; }
}

/* ── 打印样式：学术内容必备（导出 PDF / 打印阅读）──────────── */
@media print {
  body.algo-page { background: #FFF; color: #111; font-size: 11pt; }
  body.algo-page::before, body.algo-page::after { display: none; }
  .algo-topbar, .algo-toc, .algo-footer, .algo-skip, .algo-cats { display: none !important; }
  .algo-article-wrap { grid-template-columns: 1fr; padding: 0; }
  .algo-article { max-width: none; }
  .algo-article p, .algo-article li { color: #111; }
  .algo-eq, .algo-thm, .algo-code, .algo-takeaway, .algo-table-wrap { break-inside: avoid; border-color: #CCC; background: #FAFAFA; }
  .algo-article h2, .algo-article h3 { break-after: avoid; color: #000; }
  .algo-article a::after { content: " (" attr(href) ")"; font-size: 9pt; color: #555; }
}

/* ── JS 增强组件样式（algo.js 动态注入的元素）──────────────── */
.algo-progress {
  position: fixed; top: 0; left: 0; z-index: 50;
  width: 100%; height: 2px;
  background: rgba(255, 255, 255, .05);
  pointer-events: none;
}
.algo-progress span {
  display: block; height: 100%; width: 0;
  background: linear-gradient(90deg, var(--algo-cyan), var(--algo-indigo));
  box-shadow: 0 0 12px rgba(34, 211, 238, .5);
  transition: width .08s linear;
}

.algo-code__copy {
  padding: 4px 10px; border-radius: 5px;
  background: rgba(255, 255, 255, .05);
  border: 1px solid var(--algo-border);
  color: var(--algo-muted);
  font-family: var(--algo-mono); font-size: .66rem; font-weight: 700;
  letter-spacing: .08em; text-transform: uppercase;
  cursor: pointer; transition: all .18s ease;
}
.algo-code__copy:hover { color: var(--algo-fg); border-color: var(--algo-border-hi); background: rgba(34, 211, 238, .09); }
.algo-code__copy.is-done { color: var(--algo-mint); border-color: rgba(52, 211, 153, .35); background: rgba(52, 211, 153, .1); }

@media print { .algo-progress, .algo-code__copy { display: none !important; } }

/* ── 参考文献 ───────────────────────────────────────────── */
.algo-refs { list-style: none; margin: 1.6rem 0; padding: 0; }
.algo-refs li {
  position: relative; padding: .85rem 0 .85rem 3.1rem;
  border-bottom: 1px solid var(--algo-line);
  font-size: .95rem; line-height: 1.75; color: var(--algo-text-2);
}
.algo-refs li:last-child { border-bottom: 0; }
.algo-refs__no {
  position: absolute; left: 0; top: .85rem;
  font-family: var(--algo-mono); font-size: .8rem; font-weight: 700;
  color: var(--algo-cyan);
}
.algo-refs em { color: var(--algo-text-1); font-style: italic; }
.algo-refs__note { display: block; margin-top: .3rem; font-size: .88rem; color: var(--algo-text-3); }

/* ── 上一篇 / 下一篇 ─────────────────────────────────────── */
.algo-prevnext {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1rem;
  margin: 2.4rem 0 0;
}
.algo-prevnext a {
  display: block; padding: 1.05rem 1.2rem;
  border: 1px solid var(--algo-line); border-radius: var(--algo-r-md);
  background: var(--algo-surface-1);
  text-decoration: none; transition: border-color .18s ease, background .18s ease;
}
.algo-prevnext a:not(.is-disabled):hover {
  border-color: var(--algo-cyan-dim); background: var(--algo-surface-2);
}
.algo-prevnext a.is-disabled { opacity: .45; cursor: not-allowed; }
.algo-prevnext__dir {
  display: block; font-family: var(--algo-mono); font-size: .72rem;
  letter-spacing: .1em; text-transform: uppercase; color: var(--algo-text-3);
  margin-bottom: .35rem;
}
.algo-prevnext b { color: var(--algo-text-1); font-size: .95rem; font-weight: 600; }
.algo-prevnext a:last-child { text-align: right; }

/* ── 侧栏信息卡 ─────────────────────────────────────────── */
.algo-aside__card {
  margin-top: 1.1rem; padding: 1.1rem 1.2rem;
  border: 1px solid var(--algo-line); border-radius: var(--algo-r-md);
  background: var(--algo-surface-1);
}
.algo-aside__card > b {
  display: block; font-size: .78rem; letter-spacing: .09em; text-transform: uppercase;
  color: var(--algo-cyan); font-family: var(--algo-mono); margin-bottom: .8rem;
}
.algo-aside__card dl { margin: 0; display: grid; grid-template-columns: auto 1fr; gap: .45rem .8rem; }
.algo-aside__card dt {
  font-family: var(--algo-mono); font-size: .78rem; color: var(--algo-text-3); white-space: nowrap;
}
.algo-aside__card dd { margin: 0; font-size: .84rem; color: var(--algo-text-2); }
.algo-aside__card nav { display: grid; gap: .5rem; }
.algo-aside__card nav a {
  font-size: .88rem; color: var(--algo-text-2); text-decoration: none;
  padding: .18rem 0; transition: color .16s ease;
}
.algo-aside__card nav a:hover { color: var(--algo-cyan); }

@media (max-width: 900px) {
  .algo-prevnext { grid-template-columns: 1fr; }
  .algo-prevnext a:last-child { text-align: left; }
}

/* ── 文章页双栏布局：正文 + 粘性侧栏 ─────────────────────── */
.algo-article-wrap {
  display: grid; grid-template-columns: minmax(0, 1fr) 268px;
  gap: 2.6rem; align-items: start;
  padding: 2.2rem 0 3.5rem;
}
.algo-aside {
  position: sticky; top: 88px;
  display: grid; gap: 1.1rem; align-content: start;
  max-height: calc(100vh - 108px);
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: var(--algo-border-hi) transparent;
  padding-right: 4px;
}
.algo-aside::-webkit-scrollbar { width: 6px; }
.algo-aside::-webkit-scrollbar-thumb { background: var(--algo-border-hi); border-radius: 999px; }
.algo-aside::-webkit-scrollbar-track { background: transparent; }
/* 目录已由 aside 承担吸顶，内部不再二次 sticky，避免与正文重叠 */
.algo-aside .algo-toc { position: static; top: auto; }
@media (max-width: 1080px) {
  .algo-article-wrap { grid-template-columns: 1fr; gap: 1.6rem; }
  .algo-aside {
    position: static; top: auto; display: grid; gap: 1rem;
    max-height: none; overflow: visible; padding-right: 0;
  }
  .algo-aside .algo-toc {
    position: static; top: auto; padding: 16px 18px;
    background: var(--algo-surface); border: 1px solid var(--algo-border);
    border-radius: var(--algo-radius);
  }
  .algo-aside .algo-toc nav {
    border-left: 0; display: grid; gap: 4px;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  }
  .algo-aside .algo-toc a { border-left: 0; border-bottom: 2px solid transparent; padding-left: 0; }
  .algo-aside .algo-toc a:hover,
  .algo-aside .algo-toc a.is-active { border-left: 0; border-bottom-color: var(--algo-cyan); background: none; }
}