/* ============================================================
   12博 · 版本档案册 — 共享站点样式 /assets/site.css
   1 重置 · 2 变量 · 3 排版 · 4 布局 · 5 组件 · 6 刊头 · 7 页脚 · 8 响应式
   ============================================================ */

/* ---------- 1. 重置 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

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

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

img, svg { display: block; max-width: 100%; }

button { font: inherit; color: inherit; }

a { color: inherit; text-decoration-thickness: .06em; text-underline-offset: .22em; }

:focus-visible {
  outline: 3px solid var(--signal);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 2. 变量 ---------- */
:root {
  --navy: #0B1F33;
  --navy-2: #132C45;
  --paper: #F7F2E7;
  --signal: #FF6A2A;
  --signal-soft: #FFB38A;
  --mint: #7FE0C3;
  --mint-deep: #1E8F78;
  --slate: #8FA3B5;
  --graphite: #1B1712;
  --white: #FFFFFF;

  --line-dark: rgba(247, 242, 231, .16);
  --line-soft: rgba(27, 23, 18, .14);

  --r-pill: 999px;
  --r-lg: 26px;
  --r-md: 16px;
  --r-sm: 10px;

  --wrap: 1160px;
  --wrap-wide: 1400px;
  --wrap-narrow: 760px;
  --gutter: clamp(18px, 4vw, 44px);
  --section-y: clamp(56px, 7.5vw, 108px);
  --masthead-h: 110px;

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

[id] { scroll-margin-top: calc(var(--masthead-h) + 14px); }

/* ---------- 3. 排版 ---------- */
body {
  background: var(--paper);
  color: var(--graphite);
  font-family: var(--font-body);
  font-size: clamp(15px, .35vw + 14px, 17px);
  line-height: 1.86;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: -.02em;
  text-wrap: balance;
}

.display-1 {
  font-size: clamp(2.5rem, 7.4vw, 6.2rem);
  font-weight: 500;
  line-height: .98;
  letter-spacing: -.035em;
}

.display-2 {
  font-size: clamp(1.9rem, 4.4vw, 3.4rem);
  font-weight: 600;
  line-height: 1.06;
}

.title {
  font-size: clamp(1.15rem, 1.8vw, 1.5rem);
  font-weight: 700;
  line-height: 1.3;
}

.lede {
  font-size: clamp(1rem, 1.3vw, 1.15rem);
  line-height: 1.8;
  color: rgba(27, 23, 18, .78);
  max-width: 34em;
}

.note {
  font-size: .82rem;
  line-height: 1.72;
  color: var(--slate);
  max-width: 38em;
}

.kicker {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--mint-deep);
}

.mono {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .08em;
}

/* ---------- 4. 布局 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.wrap--wide { max-width: var(--wrap-wide); }
.wrap--narrow { max-width: var(--wrap-narrow); }

.section { padding-block: var(--section-y); }

.section--dark {
  background: var(--navy);
  color: var(--paper);
}

.section--ink {
  background: var(--navy-2);
  color: var(--paper);
}

.section--dark .lede,
.section--ink .lede { color: rgba(247, 242, 231, .78); }

.section--dark .note,
.section--ink .note { color: var(--slate); }

.section--dark .kicker,
.section--ink .kicker { color: var(--mint); }

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--stack-gap, 1rem);
}

.cluster {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.rule {
  height: 1px;
  border: 0;
  margin-block: clamp(24px, 4vw, 48px);
  background: var(--line-soft);
}

.section--dark .rule,
.section--ink .rule,
.rail .rule { background: var(--line-dark); }

.split {
  display: grid;
  grid-template-columns: minmax(0, 1.65fr) minmax(0, 1fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: start;
}

.split__main { min-width: 0; }

.split__aside {
  position: sticky;
  top: calc(var(--masthead-h) + 18px);
  align-self: start;
}

.archive-grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
  grid-template-columns: repeat(auto-fit, minmax(255px, 1fr));
  align-items: start;
}

/* ---------- 5. 组件 ---------- */
/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .55em;
  padding: .72em 1.5em;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  font-family: var(--font-body);
  font-size: .95rem;
  font-weight: 600;
  line-height: 1.3;
  text-decoration: none;
  cursor: pointer;
  transition: background-color .2s ease, color .2s ease, border-color .2s ease, transform .2s ease;
}

.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--signal {
  background: var(--signal);
  color: var(--navy);
}
.btn--signal:hover { background: var(--signal-soft); }

.btn--ghost {
  background: transparent;
  color: var(--paper);
  border-color: rgba(247, 242, 231, .42);
}
.btn--ghost:hover {
  background: var(--paper);
  color: var(--navy);
  border-color: var(--paper);
}

.btn--dark {
  background: var(--navy);
  color: var(--paper);
}
.btn--dark:hover { background: var(--navy-2); }

.btn--mint {
  background: var(--mint);
  color: var(--navy);
}
.btn--mint:hover { background: #63cdb0; }

/* 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: .4em;
  padding: .3em .85em;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .06em;
  line-height: 1.65;
  white-space: nowrap;
}

.tag--signal { background: var(--signal); color: var(--navy); }
.tag--mint { background: var(--mint); color: var(--navy); }

.tag--line {
  background: transparent;
  border-color: var(--line-soft);
  color: rgba(27, 23, 18, .72);
}

.section--dark .tag--line,
.section--ink .tag--line,
.rail .tag--line {
  border-color: var(--line-dark);
  color: var(--slate);
}

/* 面包屑 */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .6em;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--slate);
}

.crumbs__link {
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}
.crumbs__link:hover {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

.crumbs__sep { opacity: .55; }

.crumbs__current { color: var(--graphite); }

.section--dark .crumbs__current,
.section--ink .crumbs__current { color: var(--paper); }

/* 卡片 */
.card {
  background: var(--white);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-lg);
  padding: clamp(20px, 3vw, 34px);
}

.card--paper { background: var(--paper); }

.card--dark {
  background: var(--navy-2);
  color: var(--paper);
  border-color: var(--line-dark);
}

.card--lift {
  transition: transform .25s ease, box-shadow .25s ease;
}
.card--lift:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 44px -30px rgba(11, 31, 51, .6);
}

/* 档案侧栏 */
.rail {
  position: relative;
  background: var(--navy-2);
  color: var(--paper);
  border: 1px solid var(--line-dark);
  border-radius: var(--r-lg);
  padding: clamp(18px, 2.4vw, 26px);
}

.rail__title {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--mint);
  margin-bottom: 14px;
}

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

.rail__link {
  display: block;
  padding: .5em .7em;
  border-left: 2px solid transparent;
  border-radius: var(--r-sm);
  font-size: .9rem;
  line-height: 1.5;
  text-decoration: none;
  color: rgba(247, 242, 231, .75);
  transition: background-color .2s ease, color .2s ease, border-color .2s ease;
}

.rail__link:hover {
  background: rgba(127, 224, 195, .12);
  color: var(--paper);
}

.rail__link[aria-current="true"] {
  background: rgba(255, 106, 42, .16);
  border-left-color: var(--signal);
  color: var(--paper);
}

/* 折叠组 */
.fold {
  background: var(--white);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  overflow: hidden;
}

.fold + .fold { margin-top: 10px; }

.fold__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  font-weight: 600;
  line-height: 1.5;
  cursor: pointer;
  list-style: none;
}

.fold__summary::-webkit-details-marker { display: none; }

.fold__summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.15rem;
  line-height: 1;
  color: var(--signal);
  transition: transform .2s ease;
}

.fold[open] .fold__summary::after { content: "\2013"; }

.fold[open] .fold__summary { border-bottom: 1px solid var(--line-soft); }

.fold__body {
  padding: 16px 20px 22px;
  font-size: .95rem;
  color: rgba(27, 23, 18, .8);
}

/* 表格 */
.archive-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .9rem;
}

.archive-table th,
.archive-table td {
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line-soft);
}

.archive-table th {
  font-family: var(--font-mono);
  font-size: .7rem;
  font-weight: 500;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--slate);
}

.archive-table td.num {
  font-family: var(--font-mono);
  font-size: .82rem;
  color: var(--mint-deep);
}

/* 图片容器 */
.media-frame {
  position: relative;
  margin: 0;
  overflow: hidden;
  border-radius: var(--r-lg);
  aspect-ratio: 4 / 3;
  background:
    repeating-linear-gradient(135deg, rgba(127, 224, 195, .1) 0 10px, transparent 10px 22px),
    linear-gradient(140deg, var(--navy-2), var(--navy));
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame__caption {
  margin-top: .7em;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .08em;
  color: var(--slate);
}

/* 渐显 */
.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
}

.js-reveal [data-reveal].is-visible {
  opacity: 1;
  transform: none;
  transition: opacity .65s ease, transform .65s ease;
}

/* ---------- 6. 刊头 ---------- */
.skip-link {
  position: absolute;
  left: 16px;
  top: -80px;
  z-index: 200;
  padding: .72em 1.3em;
  border-radius: var(--r-pill);
  background: var(--mint);
  color: var(--navy);
  font-weight: 700;
  text-decoration: none;
  transition: top .2s ease;
}

.skip-link:focus { top: 12px; }

.masthead {
  position: sticky;
  top: 0;
  z-index: 80;
  background: var(--navy);
  color: var(--paper);
  border-top: 3px solid var(--signal);
  border-bottom: 1px solid var(--line-dark);
}

.masthead__bar { position: relative; }

.masthead__inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--gutter);
  width: 100%;
  max-width: var(--wrap-wide);
  margin-inline: auto;
  padding: clamp(11px, 1.5vw, 18px) var(--gutter);
}

.masthead__meta {
  justify-self: start;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .2em;
  color: var(--slate);
  white-space: nowrap;
}

.masthead__brand {
  justify-self: center;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  text-decoration: none;
  color: var(--paper);
}

.masthead__brand-cn {
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 2.3vw, 1.75rem);
  font-weight: 800;
  letter-spacing: .16em;
  line-height: 1;
  text-indent: .16em;
}

.masthead__brand-sub {
  font-size: .66rem;
  letter-spacing: .44em;
  line-height: 1;
  color: var(--slate);
  text-indent: .44em;
}

.masthead__brand:hover .masthead__brand-sub { color: var(--mint); }

.masthead__actions {
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 12px;
}

.masthead__cta { white-space: nowrap; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 46px;
  height: 46px;
  padding: 0;
  border: 1px solid var(--line-dark);
  border-radius: var(--r-pill);
  background: transparent;
  cursor: pointer;
}

.nav-toggle__bar {
  display: block;
  width: 20px;
  height: 2px;
  margin-inline: auto;
  background: var(--paper);
  transition: transform .25s ease, opacity .25s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.index-nav {
  background: var(--navy-2);
  border-top: 1px solid var(--line-dark);
}

.index-nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: clamp(4px, 1.1vw, 20px);
  width: 100%;
  max-width: var(--wrap-wide);
  margin-inline: auto;
  padding: 4px var(--gutter);
}

.index-nav__link {
  display: inline-flex;
  align-items: baseline;
  gap: .5em;
  padding: .82em .18em;
  border-bottom: 2px solid transparent;
  font-size: .92rem;
  line-height: 1.4;
  text-decoration: none;
  color: rgba(247, 242, 231, .76);
  transition: color .2s ease, border-color .2s ease;
}

.index-nav__link:hover { color: var(--white); }

.index-nav__no {
  font-family: var(--font-mono);
  font-size: .64rem;
  letter-spacing: .08em;
  color: var(--slate);
  transition: color .2s ease;
}

.index-nav__link[aria-current="page"] {
  color: var(--paper);
  border-bottom-color: var(--signal);
}

.index-nav__link[aria-current="page"] .index-nav__no { color: var(--signal); }

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  height: 3px;
  width: 0;
  background: var(--signal);
}

/* ---------- 7. 页脚 ---------- */
.site-foot {
  margin-top: clamp(48px, 7vw, 96px);
  background: var(--navy);
  color: var(--paper);
}

.site-foot__rule {
  height: 6px;
  background: linear-gradient(90deg, var(--signal) 0 62%, var(--mint) 62% 100%);
}

.site-foot__grid {
  display: grid;
  grid-template-columns: 1.5fr .85fr 1fr;
  gap: clamp(26px, 4vw, 60px);
  padding-block: clamp(38px, 5.5vw, 70px);
}

.site-foot__lead { min-width: 0; }

.site-foot__mark {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.8vw, 2.1rem);
  font-weight: 800;
  letter-spacing: .12em;
  line-height: 1.1;
  margin-bottom: 14px;
}

.site-foot__summary {
  max-width: 24em;
  font-size: .94rem;
  line-height: 1.8;
  color: rgba(247, 242, 231, .72);
}

.site-foot__issue {
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .2em;
  color: var(--mint);
}

.site-foot__nav-title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--slate);
}

.site-foot__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.site-foot__link {
  position: relative;
  display: inline-block;
  font-size: .94rem;
  text-decoration: none;
  color: rgba(247, 242, 231, .78);
  transition: color .2s ease;
}

.site-foot__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -3px;
  width: 0;
  height: 1px;
  background: var(--signal);
  transition: width .25s ease;
}

.site-foot__link:hover { color: var(--paper); }
.site-foot__link:hover::after { width: 100%; }

.site-foot__dl { display: block; }

.site-foot__row {
  display: flex;
  flex-wrap: wrap;
  gap: 2px 12px;
  margin-bottom: 10px;
}

.site-foot__row dt {
  min-width: 5.2em;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .1em;
  color: var(--slate);
}

.site-foot__row dd {
  font-size: .9rem;
  line-height: 1.6;
  color: rgba(247, 242, 231, .86);
  word-break: break-word;
}

.site-foot__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding-block: 20px 30px;
  border-top: 1px solid var(--line-dark);
  font-size: .8rem;
  color: var(--slate);
}

.site-foot__copy { line-height: 1.6; }

.site-foot__legal-list {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.site-foot__legal-link {
  text-decoration: none;
  color: inherit;
  transition: color .2s ease;
}

.site-foot__legal-link:hover { color: var(--signal); }

.site-foot__icp {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
}

/* ---------- 8. 响应式 ---------- */
@media (max-width: 1024px) {
  .masthead__meta { font-size: .64rem; letter-spacing: .14em; }
  .index-nav__link { font-size: .88rem; padding-inline: .1em; }
  .split { grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); }
  .site-foot__grid { grid-template-columns: 1fr 1fr; }
  .site-foot__contact { grid-column: 1 / -1; }
}

@media (max-width: 880px) {
  .masthead__inner {
    grid-template-columns: 1fr auto;
    gap: 12px;
  }

  .masthead__meta { display: none; }

  .masthead__brand {
    justify-self: start;
    align-items: flex-start;
  }

  .masthead__brand-cn { letter-spacing: .12em; text-indent: .12em; }
  .masthead__brand-sub { letter-spacing: .3em; text-indent: .3em; }

  .masthead__cta { display: none; }

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

  .index-nav { display: none; }

  .index-nav[data-open] {
    display: block;
    max-height: calc(100vh - 84px);
    overflow-y: auto;
  }

  .index-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-block: 8px 14px;
  }

  .index-nav__link {
    justify-content: flex-start;
    padding: .95em .2em;
    border-bottom: 1px solid var(--line-dark);
    font-size: 1rem;
  }

  .index-nav__link[aria-current="page"] {
    border-bottom-color: var(--signal);
    padding-left: .8em;
    background: rgba(255, 106, 42, .1);
  }

  .split { grid-template-columns: 1fr; }
  .split__aside { position: static; top: auto; }

  .display-1 { letter-spacing: -.03em; }

  .site-foot__grid { grid-template-columns: 1fr; }
  .site-foot__contact { grid-column: auto; }

  .site-foot__legal {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
  }
}

@media (max-width: 560px) {
  .btn { padding: .66em 1.2em; font-size: .9rem; }
  .card { border-radius: 20px; }
  .rail { border-radius: 20px; }
  .media-frame { border-radius: 20px; }
  .archive-grid { grid-template-columns: 1fr; }
  .site-foot__row { gap: 0 8px; }
  .site-foot__row dt { min-width: 4.6em; }
}

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

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

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }

  .btn:hover,
  .card--lift:hover { transform: none; }
}