/* ============================================================
   bob体官网 · 共享样式表 /assets/site.css
   01 reset · 02 变量 · 03 基底 · 04 布局 · 05 页头 · 06 页脚
   07 按钮 · 08 面包屑 · 09 通用组件 · 10 图片容器 · 11 响应式
   ============================================================ */

/* ---------- 01 reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body,
h1, h2, h3, h4, h5,
p, ul, ol, li, figure, blockquote, dl, dt, dd {
  margin: 0;
}

ul, ol { padding: 0; list-style: none; }

img, svg { max-width: 100%; height: auto; vertical-align: middle; }

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

table { border-collapse: collapse; width: 100%; }

/* ---------- 02 变量 ---------- */
:root {
  --ink: #0B2B22;
  --ink-deep: #101C2E;
  --cyan: #29E0C8;
  --cyan-soft: #7FF3E4;
  --gold: #E8B23C;
  --pulse: #FF5A36;
  --wine: #7A1F35;
  --violet: #3B2A6B;
  --paper: #F2F5F1;
  --mute: #9FB3A8;
  --rule: #2C4A3E;

  --font-display: "Arial Narrow", "Helvetica Neue Condensed", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;

  --wrap: 1440px;
  --edge: 96px;
  --gutter: 32px;
  --band-h: 16px;
  --head-h: 104px;
  --shadow-none: none;
}

/* ---------- 03 基底 ---------- */
body {
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  letter-spacing: 0.01em;
  min-height: 100vh;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: 0.01em;
}

a { color: var(--cyan); text-decoration: none; }
a:hover { color: var(--cyan-soft); }

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

::selection {
  background: var(--cyan);
  color: var(--ink);
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -80px;
  z-index: 300;
  background: var(--cyan);
  color: var(--ink);
  padding: 12px 22px;
  font-size: 13px;
  letter-spacing: 0.18em;
  transition: top 0.2s ease;
}

.skip-link:hover,
.skip-link:focus {
  top: 12px;
  color: var(--ink);
}

/* ---------- 04 布局 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--edge);
}

.bg-ink { background: var(--ink); }
.bg-deep { background: var(--ink-deep); }
.bg-wine { background: var(--wine); }
.bg-violet { background: var(--violet); }
.bg-paper { background: var(--paper); color: var(--ink); }

.bg-paper h1,
.bg-paper h2,
.bg-paper h3 { color: var(--ink); }

.bg-paper .section-head__note,
.bg-paper .footnote,
.bg-paper .card__body { color: #4A5C53; }

.display-xl {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(46px, 10.5vw, 168px);
  line-height: 0.92;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  margin: 0;
}

.lede {
  max-width: 34em;
  font-size: clamp(17px, 1.35vw, 21px);
  line-height: 1.8;
  color: var(--paper);
}

.prose {
  max-width: 34em;
  font-size: 16px;
  line-height: 1.9;
  color: var(--paper);
}

.prose p { margin: 0 0 1.1em; }
.prose strong { color: var(--cyan); font-weight: 700; }

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--cyan);
}

.side-note {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--mute);
}

.footnote {
  display: block;
  font-size: 12px;
  line-height: 1.75;
  color: var(--mute);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

/* ---------- 05 页头 ---------- */
.site-head {
  position: sticky;
  top: 0;
  z-index: 80;
  background: var(--ink);
  border-bottom: 1px solid var(--rule);
}

.head-grid {
  position: relative;
  display: grid;
  grid-template-columns: auto auto 1fr auto;
  align-items: center;
  gap: 32px;
  min-height: var(--head-h);
  transition: min-height 0.28s ease;
}

.site-head[data-condensed="true"] .head-grid { min-height: 64px; }
.site-head[data-condensed="true"] .brand-mark__glyph { font-size: 22px; }
.site-head[data-condensed="true"] .brand-meta { opacity: 0; visibility: hidden; }

.brand-block {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand-mark {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  color: var(--paper);
}

.brand-mark:hover { color: var(--paper); }

.brand-mark__glyph {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 32px;
  line-height: 1;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  transition: font-size 0.28s ease;
}

.brand-mark__word {
  font-size: 12px;
  letter-spacing: 0.42em;
  color: var(--cyan);
}

.brand-meta {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  color: var(--mute);
  transition: opacity 0.24s ease, visibility 0.24s ease;
}

.head-season {
  display: flex;
  align-items: center;
  gap: 6px;
  padding-left: 24px;
  border-left: 1px solid var(--rule);
}

.head-season__label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.28em;
  color: var(--mute);
  margin-right: 4px;
  text-transform: uppercase;
}

.season-key {
  min-width: 34px;
  height: 30px;
  padding: 0 8px;
  border: 1px solid var(--rule);
  color: var(--mute);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.season-key:hover {
  color: var(--cyan-soft);
  border-color: var(--cyan);
}

.season-key.is-active,
.season-key[aria-pressed="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: 1px solid var(--rule);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.28em;
}

.nav-toggle__bars {
  position: relative;
  width: 18px;
  height: 8px;
  display: inline-block;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--cyan);
}

.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars::after { bottom: 0; }

.nav-toggle[aria-expanded="true"] {
  border-color: var(--cyan);
  color: var(--cyan);
}

.nav-toggle__text { line-height: 1; }

.site-nav {
  border-left: 1px solid var(--rule);
  padding-left: 40px;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 28px;
}

.site-nav__item { margin: 0; }

.site-nav__link {
  position: relative;
  display: inline-block;
  padding: 6px 0;
  font-size: 14px;
  letter-spacing: 0.14em;
  color: var(--mute);
  transition: color 0.2s ease;
}

.site-nav__link:hover { color: var(--cyan-soft); }

.site-nav__link[aria-current="page"] { color: var(--cyan); }

.site-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--cyan);
}

.head-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: rgba(44, 74, 62, 0.55);
  overflow: hidden;
}

.head-progress__bar {
  display: block;
  height: 100%;
  width: 100%;
  background: var(--cyan);
  transform: scaleX(var(--progress, 0));
  transform-origin: 0 50%;
  will-change: transform;
}

/* ---------- 06 页脚 ---------- */
.site-foot {
  background: var(--ink-deep);
  border-top: 1px solid var(--rule);
  padding: 72px 0 32px;
  color: var(--paper);
}

.foot-grid {
  display: grid;
  grid-template-columns: 6fr 4fr 2fr;
  gap: 56px;
  align-items: start;
}

.foot-title {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 11px;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--rule);
}

.foot-index__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.foot-index__group { min-width: 0; }

.foot-index__head {
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--paper);
  margin: 0 0 10px;
}

.foot-list { margin: 0; padding: 0; }

.foot-list li { margin-bottom: 8px; }

.foot-list--contact li { margin-bottom: 14px; }

.foot-link {
  font-size: 13px;
  color: var(--mute);
  letter-spacing: 0.04em;
  transition: color 0.2s ease;
}

.foot-link:hover { color: var(--cyan); }

.foot-key {
  display: block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--mute);
}

.foot-val {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.65;
  color: var(--paper);
  word-break: break-word;
}

.foot-contact .footnote { margin-top: 18px; }

.foot-meta { text-align: left; }

.foot-icp {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--cyan-soft);
  margin-bottom: 10px;
}

.foot-copy {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mute);
}

.foot-base {
  margin-top: 56px;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
}

.foot-scope {
  font-size: 12px;
  line-height: 1.8;
  color: var(--mute);
}

/* ---------- 07 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 26px;
  border: 1px solid var(--cyan);
  background: transparent;
  color: var(--cyan);
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: 0.2em;
  line-height: 1;
  transition: background-color 0.22s ease, color 0.22s ease, border-color 0.22s ease;
}

.btn:hover {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
}

.btn--solid {
  background: var(--cyan);
  color: var(--ink);
}

.btn--solid:hover {
  background: var(--cyan-soft);
  border-color: var(--cyan-soft);
  color: var(--ink);
}

.btn--ghost {
  border-color: var(--rule);
  color: var(--paper);
}

.btn--ghost:hover {
  background: transparent;
  border-color: var(--cyan);
  color: var(--cyan);
}

/* ---------- 08 面包屑 ---------- */
.crumbs {
  padding: 24px 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mute);
}

.crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

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

.crumbs li::after {
  content: "/";
  margin-left: 6px;
  color: var(--rule);
}

.crumbs li:last-child::after { content: ""; margin: 0; }

.crumbs a { color: var(--mute); }
.crumbs a:hover { color: var(--cyan); }

/* ---------- 09 通用组件 ---------- */
.band {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: var(--band-h);
  padding: 0 var(--edge);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  line-height: 1;
}

.band--ink { background: var(--rule); color: var(--cyan-soft); }
.band--wine { background: var(--wine); color: var(--paper); }
.band--violet { background: var(--violet); color: var(--paper); }

.chapter {
  position: relative;
  padding: 0 0 96px;
}

.chapter[data-section] { scroll-margin-top: 130px; }

.section-head {
  display: grid;
  grid-template-columns: 3fr 9fr;
  gap: var(--gutter);
  align-items: end;
  padding: 40px 0 28px;
  border-top: 1px solid var(--rule);
}

.section-head__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--cyan);
}

.section-head__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 3.6vw, 52px);
  line-height: 1.06;
  letter-spacing: 0.01em;
  margin: 0 0 12px;
}

.section-head__note {
  font-size: 12px;
  line-height: 1.8;
  color: var(--mute);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  max-width: 34em;
}

.rail { display: block; }

.rail__list {
  position: sticky;
  top: 130px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.rail__item { margin: 0; }

.rail__node {
  display: block;
  width: 100%;
  text-align: left;
  padding: 4px 0 4px 14px;
  border-left: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mute);
  transition: color 0.2s ease, transform 0.24s ease, border-color 0.2s ease;
}

.rail__node:hover { color: var(--paper); }

.rail__node[data-active="true"] {
  color: var(--cyan);
  border-left-color: var(--cyan);
  transform: translateX(6px);
}

.card-matrix {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: var(--gutter);
}

.card {
  grid-column: span 2;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 26px;
  background: var(--ink-deep);
  border: 1px solid var(--rule);
  transition: border-color 0.24s ease;
}

.card:hover { border-color: var(--cyan); }

.card--wide { grid-column: span 3; }
.card--tall { grid-row: span 2; }

.card__meta {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--mute);
}

.card__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 19px;
  line-height: 1.28;
  margin: 0;
}

.card__body {
  font-size: 14px;
  line-height: 1.8;
  color: var(--mute);
}

.metric-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.metric-strip > * {
  background: var(--ink-deep);
  padding: 28px 24px;
}

.metric {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(38px, 6vw, 84px);
  line-height: 0.95;
  letter-spacing: -0.02em;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.metric--cyan { color: var(--cyan); }
.metric--gold { color: var(--gold); }
.metric--pulse { color: var(--pulse); }

.metric__label {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--mute);
}

.overflow-lift {
  margin-left: calc(-1 * clamp(0px, 4vw, 72px));
}

.legend-filter {
  display: inline-flex;
  flex-wrap: wrap;
  border: 1px solid var(--rule);
}

.legend-filter__key {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-right: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mute);
  transition: color 0.2s ease, background-color 0.2s ease;
}

.legend-filter__key:last-child { border-right: 0; }

.legend-filter__key::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--mute);
  transition: background-color 0.2s ease;
}

.legend-filter__key:hover { color: var(--paper); }

.legend-filter__key[aria-pressed="true"] {
  color: var(--paper);
  background: rgba(41, 224, 200, 0.09);
}

.legend-filter__key[aria-pressed="true"]::before { background: var(--cyan); }

.data-table {
  width: 100%;
  border: 1px solid var(--rule);
  font-size: 14px;
  font-variant-numeric: tabular-nums;
}

.data-table th,
.data-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--rule);
  text-align: left;
}

.data-table thead th {
  background: var(--ink-deep);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mute);
}

.data-table tbody tr:hover { background: rgba(41, 224, 200, 0.05); }

.data-table .is-positive {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--gold);
}

.data-table .is-negative {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--pulse);
}

/* ---------- 10 图片容器 ---------- */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  background: var(--ink-deep);
  border: 1px solid var(--rule);
  overflow: hidden;
}

.media-frame::before {
  content: "";
  display: block;
  width: 100%;
  padding-top: 56.25%;
}

.media-frame--tall::before { padding-top: 128%; }
.media-frame--square::before { padding-top: 100%; }
.media-frame--wide::before { padding-top: 40%; }

.media-frame > img {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame__slot {
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(0deg, rgba(44, 74, 62, 0.65) 0 1px, transparent 1px 16px),
    repeating-linear-gradient(90deg, rgba(44, 74, 62, 0.4) 0 1px, transparent 1px 16px),
    linear-gradient(160deg, var(--ink-deep) 0%, var(--ink) 100%);
}

.media-frame__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  margin: 0;
  padding: 8px 12px;
  background: rgba(11, 43, 34, 0.84);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan-soft);
}

/* ---------- 11 动效与响应式 ---------- */
html[data-js] [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}

html[data-js] [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

@media (max-width: 1200px) {
  :root { --edge: 56px; }
}

@media (max-width: 1020px) {
  :root { --edge: 40px; --head-h: 76px; --gutter: 24px; }

  .head-grid {
    grid-template-columns: 1fr auto auto;
    gap: 16px;
  }

  .nav-toggle { display: inline-flex; }

  .brand-meta { display: none; }

  .head-season {
    padding-left: 0;
    border-left: 0;
  }

  .head-season__label { display: none; }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    z-index: 70;
    display: none;
    padding: 8px 0 20px;
    border-left: 0;
    border-top: 1px solid var(--rule);
    border-bottom: 1px solid var(--rule);
    background: var(--ink-deep);
  }

  .site-nav[data-open] { display: block; }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-nav__link {
    display: block;
    padding: 15px 20px;
    border-bottom: 1px solid var(--rule);
    font-size: 15px;
    letter-spacing: 0.1em;
  }

  .site-nav__item:last-child .site-nav__link { border-bottom: 0; }

  .site-nav__link[aria-current="page"] {
    background: rgba(41, 224, 200, 0.08);
    color: var(--cyan);
  }

  .site-nav__link[aria-current="page"]::after { display: none; }

  .foot-grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }

  .foot-meta { grid-column: 1 / -1; }

  .foot-index__grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  .section-head {
    grid-template-columns: 1fr;
    gap: 12px;
    align-items: start;
  }

  .card-matrix { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .card { grid-column: span 1; }
  .card--wide { grid-column: span 2; }
  .card--tall { grid-row: span 1; }

  .rail__list {
    position: static;
    flex-direction: row;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 8px;
    -webkit-overflow-scrolling: touch;
  }

  .rail__node {
    width: auto;
    white-space: nowrap;
    padding: 8px 12px;
    border-left: 0;
    border-bottom: 1px solid var(--rule);
  }

  .rail__node[data-active="true"] { transform: none; }

  .metric-strip { grid-template-columns: 1fr; }

  .chapter { padding-bottom: 64px; }
}

@media (max-width: 680px) {
  :root { --edge: 20px; --gutter: 16px; }

  body { font-size: 15px; }

  .band { padding: 0 20px; letter-spacing: 0.2em; }

  .brand-mark__glyph { font-size: 24px; }

  .site-foot { padding: 56px 0 24px; }

  .foot-grid { grid-template-columns: 1fr; gap: 32px; }

  .foot-index__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .overflow-lift { margin-left: 0; }

  .card-matrix { grid-template-columns: 1fr; }
  .card--wide { grid-column: span 1; }

  .card,
  .metric-strip > * { padding: 20px; }

  .data-table th,
  .data-table td { padding: 10px 12px; }
}

@media (max-width: 420px) {
  .foot-index__grid { grid-template-columns: 1fr; }
  .legend-filter { display: flex; width: 100%; }
  .legend-filter__key { flex: 1 1 auto; justify-content: center; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  html[data-js] [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}