/* ==========================================================================
   尊龙凯寸通用版9 · 共享样式表  /assets/site.css
   视觉基调：深空蓝底 + 玄夜蓝分层 + 朱砂红/鎏金仪式刻度 + 米白纸档案板
   ========================================================================== */

/* --- 1. 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, dl, dd, figure, blockquote, hr { margin: 0; }

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

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

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

a { color: inherit; text-decoration: none; }

table { border-collapse: collapse; border-spacing: 0; }

/* --- 2. 变量 -------------------------------------------------------------- */
:root {
  --ink: #0A1A2F;
  --ink-2: #12294A;
  --ink-3: #0E2038;
  --ink-soft: #33445C;
  --cinnabar: #C4402E;
  --cinnabar-deep: #9E2F20;
  --turquoise: #2F8F7C;
  --gold: #D8A33C;
  --clay: #B4714B;
  --moss: #5C7346;
  --slate: #7C8899;
  --paper: #F4EFE3;
  --snow: #E9EEF5;
  --muted: #C6D2E2;
  --line: rgba(216, 163, 60, .34);
  --line-soft: rgba(233, 238, 245, .14);
  --shadow-1: 0 10px 26px rgba(3, 10, 20, .42);
  --shadow-2: 0 20px 44px rgba(3, 10, 20, .58);
  --font-display: "Songti SC", "STSong", "Noto Serif SC", "Source Han Serif SC", Georgia, "Times New Roman", serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "SFMono-Regular", Menlo, Consolas, "Liberation Mono", "Courier New", monospace;
  --wrap: 1240px;
  --pad: clamp(16px, 4vw, 48px);
  --gap: clamp(16px, 2.2vw, 30px);
  --ease: cubic-bezier(.22, .61, .36, 1);
  --dur: 240ms;
  --radius: 2px;
}

/* --- 3. 基础排版 ---------------------------------------------------------- */
body {
  min-height: 100%;
  background-color: var(--ink);
  background-image:
    radial-gradient(1100px 620px at 84% -14%, rgba(18, 41, 74, .95), rgba(10, 26, 47, 0) 68%),
    radial-gradient(780px 520px at -10% 30%, rgba(18, 41, 74, .72), rgba(10, 26, 47, 0) 70%);
  background-repeat: no-repeat;
  color: var(--snow);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  letter-spacing: .02em;
}

h1, h2, h3, h4, .display {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.26;
  letter-spacing: .015em;
  color: var(--snow);
}

h1 { font-size: clamp(2rem, 5.2vw, 3.4rem); }
h2 { font-size: clamp(1.5rem, 3.2vw, 2.2rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.5rem); }
h4 { font-size: 1.05rem; }

p { text-wrap: pretty; }

strong { color: var(--snow); font-weight: 700; }

.num, .mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; letter-spacing: .02em; }

/* --- 4. 焦点与可访问性 ---------------------------------------------------- */
:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
  border-radius: 1px;
}

.plate--paper :focus-visible,
.section--paper :focus-visible,
.skip-link:focus-visible { outline-color: var(--cinnabar); }

#main-content:focus-visible { outline-offset: -4px; }

.skip-link {
  position: absolute;
  left: 50%;
  top: 10px;
  z-index: 200;
  transform: translate(-50%, -240%);
  padding: 10px 18px;
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--gold);
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .06em;
  transition: transform var(--dur) var(--ease);
}

.skip-link:focus { transform: translate(-50%, 0); }

/* --- 5. 印刷外框 ---------------------------------------------------------- */
.frame-edges {
  position: fixed;
  inset: 8px;
  border: 1px solid rgba(216, 163, 60, .16);
  pointer-events: none;
  z-index: 80;
}

.frame-corner {
  position: absolute;
  width: 14px;
  height: 14px;
  border: 0 solid var(--gold);
  opacity: .78;
}

.frame-corner--tl { top: -1px; left: -1px; border-top-width: 2px; border-left-width: 2px; }
.frame-corner--tr { top: -1px; right: -1px; border-top-width: 2px; border-right-width: 2px; }
.frame-corner--bl { bottom: -1px; left: -1px; border-bottom-width: 2px; border-left-width: 2px; }
.frame-corner--br { bottom: -1px; right: -1px; border-bottom-width: 2px; border-right-width: 2px; }

/* --- 6. 版心与分区 -------------------------------------------------------- */
.wrap {
  width: min(calc(100% - (2 * var(--pad))), var(--wrap));
  margin-inline: auto;
}

.site-main { display: block; }

.section { padding: clamp(44px, 6.4vw, 92px) 0; }
.section--tight { padding: clamp(28px, 3.6vw, 52px) 0; }

.section--band {
  background-image: linear-gradient(180deg, rgba(18, 41, 74, .78), rgba(18, 41, 74, .34));
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.section--paper {
  background: var(--paper);
  color: var(--ink);
  border-top: 1px solid rgba(10, 26, 47, .12);
  border-bottom: 1px solid rgba(10, 26, 47, .12);
}

.section--paper h1,
.section--paper h2,
.section--paper h3,
.section--paper h4 { color: var(--ink); }

.section--paper .eyebrow { color: var(--cinnabar); }
.section--paper .eyebrow::before { background: var(--cinnabar); }
.section--paper .lede,
.section--paper .page-head__lede { color: var(--ink-soft); }
.section--paper .note { color: var(--slate); }

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 14px 24px;
  margin-bottom: clamp(20px, 3vw, 36px);
}

.page-head { padding: clamp(32px, 5.4vw, 76px) 0 clamp(20px, 3vw, 38px); }

.page-head__lede,
.lede {
  max-width: 64ch;
  color: var(--muted);
  font-size: clamp(15px, 1.35vw, 17px);
}

.prose { max-width: 68ch; }
.prose p + p { margin-top: 1em; }
.prose h2 { margin-top: 1.7em; }
.prose h3 { margin-top: 1.4em; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--gold);
}

.eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--gold);
}

.cut {
  display: inline-block;
  width: 34px;
  height: 2px;
  margin: 0 .5em;
  position: relative;
  vertical-align: middle;
  background: var(--cinnabar);
}

.cut::after {
  content: "";
  position: absolute;
  right: -6px;
  top: -4px;
  width: 2px;
  height: 10px;
  background: var(--gold);
}

.rule-gold {
  height: 1px;
  border: 0;
  background-image: linear-gradient(90deg, var(--gold), rgba(216, 163, 60, 0));
}

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

/* --- 7. 十二列网格 -------------------------------------------------------- */
.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gap);
}

.span-3, .span-4, .span-5, .span-6, .span-7, .span-8, .span-9, .span-12 { grid-column: span 12; }

@media (min-width: 760px) {
  .span-3 { grid-column: span 3; }
  .span-4 { grid-column: span 4; }
  .span-6 { grid-column: span 6; }
  .span-9 { grid-column: span 9; }
}

@media (min-width: 1024px) {
  .span-5 { grid-column: span 5; }
  .span-7 { grid-column: span 7; }
  .span-8 { grid-column: span 8; }
  .push-1 { grid-column-start: 2; }
  .push-2 { grid-column-start: 3; }
}

/* --- 8. 按钮 -------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 14.5px;
  font-weight: 600;
  letter-spacing: .06em;
  white-space: nowrap;
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease), color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease);
}

.btn--primary {
  background: var(--cinnabar);
  color: var(--paper);
  box-shadow: 0 8px 18px rgba(196, 64, 46, .26);
}

.btn--primary:hover {
  background: var(--cinnabar-deep);
  transform: translateY(-2px);
  box-shadow: 0 14px 24px rgba(196, 64, 46, .32);
}

.btn--ghost {
  background: transparent;
  color: var(--snow);
  border-color: var(--line);
}

.btn--ghost:hover {
  background: rgba(216, 163, 60, .12);
  border-color: var(--gold);
  transform: translateY(-2px);
}

.section--paper .btn--ghost { color: var(--ink); border-color: rgba(10, 26, 47, .28); }
.section--paper .btn--ghost:hover { border-color: var(--cinnabar); color: var(--cinnabar-deep); background: rgba(196, 64, 46, .08); }

/* --- 9. 页头：框架式导航 -------------------------------------------------- */
.site-frame {
  position: sticky;
  top: 0;
  z-index: 60;
  background-color: var(--ink);
  background-image: linear-gradient(180deg, rgba(18, 41, 74, .94), rgba(10, 26, 47, .98));
  border-bottom: 1px solid var(--line);
}

.frame-band { position: relative; }

.frame-band--top {
  padding: clamp(12px, 1.5vw, 18px) 0;
  border-bottom: 1px solid var(--line-soft);
}

.frame-top {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--gap);
}

/* 品牌铭牌 */
.brand { display: inline-flex; align-items: center; gap: 12px; }

.brand__mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  flex: none;
  border: 1px solid var(--line);
  background-image: linear-gradient(160deg, rgba(196, 64, 46, .95), rgba(158, 47, 32, .95));
  color: var(--paper);
  box-shadow: inset 0 0 0 3px rgba(10, 26, 47, .24);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.brand__glyph { font-family: var(--font-display); font-size: 22px; font-weight: 700; line-height: 1; }

.brand__text { display: flex; flex-direction: column; gap: 1px; }

.brand__name {
  font-family: var(--font-display);
  font-size: clamp(17px, 1.5vw, 20px);
  font-weight: 700;
  letter-spacing: .07em;
  color: var(--snow);
}

.brand__tagline { font-size: 11.5px; letter-spacing: .16em; color: var(--gold); }

.brand:hover .brand__mark { border-color: var(--gold); transform: translateY(-2px); }

/* 状态数据条 */
.header-data {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 6px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--slate);
}

.data-tick {
  width: 26px;
  height: 1px;
  flex: none;
  background-image: linear-gradient(90deg, var(--gold), rgba(216, 163, 60, 0));
}

.data-item { white-space: nowrap; }
.data-sep { color: rgba(216, 163, 60, .55); }

.header-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; justify-self: end; }

/* 栏目索引条 */
.frame-band--nav { padding: 0; }

.frame-nav-row { display: block; }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .16em;
  color: var(--snow);
  text-align: left;
}

.nav-toggle__bars { display: inline-flex; flex-direction: column; gap: 4px; width: 20px; flex: none; }
.nav-toggle__bars i { display: block; height: 1.5px; background: var(--gold); transition: background-color var(--dur) var(--ease); }
.nav-toggle__bars i:nth-child(2) { width: 13px; }

.nav-toggle[aria-expanded="true"] { color: var(--gold); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i { background: var(--cinnabar); }

.frame-nav { display: block; }

.frame-nav__list { display: flex; align-items: stretch; }

.frame-nav__item {
  flex: 1 1 0;
  min-width: 0;
  border-right: 1px solid var(--line-soft);
}

.frame-nav__item:first-child { border-left: 1px solid var(--line-soft); }

.frame-nav__link {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 13px 14px;
  font-size: 14.5px;
  letter-spacing: .04em;
  color: var(--muted);
  border-bottom: 2px solid transparent;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

.frame-nav__index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--gold);
}

.frame-nav__label { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.frame-nav__link:hover {
  background: rgba(244, 239, 227, .06);
  color: var(--snow);
  border-bottom-color: var(--gold);
}

.frame-nav__link:hover .frame-nav__index { color: var(--cinnabar); }

.frame-nav__link[aria-current="page"] {
  background: var(--paper);
  color: var(--ink);
  border-bottom-color: var(--cinnabar);
}

.frame-nav__link[aria-current="page"] .frame-nav__index { color: var(--cinnabar); }

/* 滚动进度尺 */
.frame-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  display: block;
  height: 2px;
  overflow: hidden;
  background: rgba(216, 163, 60, .14);
}

.frame-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background-image: linear-gradient(90deg, var(--gold), var(--cinnabar) 84%);
  transition: transform 120ms linear;
}

/* --- 10. 平面板 / 标签 / 状态 -------------------------------------------- */
.plate {
  position: relative;
  padding: clamp(20px, 2.4vw, 32px);
  background-image: linear-gradient(180deg, rgba(18, 41, 74, .94), rgba(14, 32, 56, .94));
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

.plate--paper {
  background-image: none;
  background: var(--paper);
  color: var(--ink);
  border-color: rgba(10, 26, 47, .14);
  box-shadow: 10px 10px 0 -1px rgba(216, 163, 60, .22), var(--shadow-2);
}

.plate--paper h2,
.plate--paper h3,
.plate--paper h4 { color: var(--ink); }

.plate--paper p { color: var(--ink-soft); }

.plate--outline {
  background: transparent;
  background-image: none;
  box-shadow: none;
  border-style: dashed;
  border-color: var(--line);
}

.plate--lift:hover,
.plate--lift:focus-within {
  transform: translateY(-3px);
  box-shadow: var(--shadow-2);
}

.stamp {
  display: inline-grid;
  place-items: center;
  width: 58px;
  height: 58px;
  flex: none;
  padding: 6px;
  border: 1px solid var(--gold);
  background: rgba(216, 163, 60, .08);
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.3;
  letter-spacing: .08em;
  text-align: center;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: rgba(233, 238, 245, .06);
  color: var(--snow);
  font-size: 12px;
  letter-spacing: .08em;
  white-space: nowrap;
}

.tag--clay { background: rgba(180, 113, 75, .22); border-color: rgba(180, 113, 75, .62); color: #F1D8C6; }
.tag--moss { background: rgba(92, 115, 70, .26); border-color: rgba(92, 115, 70, .68); color: #DBE4CE; }
.tag--gold { background: rgba(216, 163, 60, .16); border-color: rgba(216, 163, 60, .62); color: #F3DDAE; }
.tag--cinnabar { background: rgba(196, 64, 46, .22); border-color: rgba(196, 64, 46, .7); color: #F4CFC6; }

.status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 11px;
  border-radius: 999px;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: .06em;
  white-space: nowrap;
}

.status::before {
  content: "";
  width: 7px;
  height: 7px;
  flex: none;
  border-radius: 50%;
  background: currentColor;
}

.status--ok { color: #9EE3D3; background: rgba(47, 143, 124, .2); border: 1px solid rgba(47, 143, 124, .62); }
.status--wait { color: #F3DDAE; background: rgba(216, 163, 60, .14); border: 1px solid rgba(216, 163, 60, .52); }
.status--grey { color: var(--slate); background: rgba(124, 136, 153, .14); border: 1px solid rgba(124, 136, 153, .46); }

.stat { display: flex; flex-direction: column; gap: 6px; }
.stat__value { font-family: var(--font-mono); font-size: clamp(28px, 4vw, 44px); line-height: 1.1; color: var(--gold); }
.stat__label { font-size: 12.5px; letter-spacing: .12em; color: var(--slate); }

.num { color: inherit; }

.term { border-bottom: 1px dashed var(--line); padding-bottom: 1px; }

.note {
  padding-left: 12px;
  border-left: 2px solid var(--gold);
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate);
}

/* --- 11. 影像容器 --------------------------------------------------------- */
.figure { margin: 0; display: block; }

.figure__frame {
  position: relative;
  display: grid;
  place-items: center;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background-image: linear-gradient(150deg, #12294A, #0E2038);
  border: 1px solid var(--line-soft);
}

.figure__frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(216, 163, 60, .07) 1px, rgba(216, 163, 60, 0) 1px),
    linear-gradient(90deg, rgba(216, 163, 60, .07) 1px, rgba(216, 163, 60, 0) 1px);
  background-size: 34px 34px;
  pointer-events: none;
}

.figure__frame > img {
  position: relative;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 420ms var(--ease);
}

.figure:hover .figure__frame > img { transform: scale(1.03); }

.figure__ph {
  position: relative;
  padding: 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-align: center;
  color: rgba(233, 238, 245, .42);
}

.figure__cap {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-top: 10px;
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--slate);
}

.figure__cap .num { color: var(--gold); }

.figure--wide .figure__frame { aspect-ratio: 16 / 9; }
.figure--tall .figure__frame { aspect-ratio: 3 / 4; }
.figure--square .figure__frame { aspect-ratio: 1 / 1; }
.figure--micro .figure__frame { aspect-ratio: 5 / 4; }

.figure--framed .figure__frame {
  border-color: var(--line);
  box-shadow: 8px 8px 0 -1px rgba(216, 163, 60, .16);
}

/* --- 12. 时间轴 / 表格 / 筛选 / 章节导航 --------------------------------- */
.timeline {
  position: relative;
  padding-left: 26px;
  border-left: 1px solid var(--line);
}

.timeline__item {
  position: relative;
  padding: 18px 0;
}

.timeline__item + .timeline__item { border-top: 1px solid var(--line-soft); }

.timeline__item::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 26px;
  width: 9px;
  height: 9px;
  transform: rotate(45deg);
  background: var(--ink);
  border: 1px solid var(--gold);
  transition: background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.timeline__item[data-active="true"]::before {
  background: var(--cinnabar);
  border-color: var(--gold);
  box-shadow: 0 0 0 4px rgba(196, 64, 46, .18);
}

.timeline__date {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--gold);
}

.timeline__body { margin-top: 6px; }

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: rgba(14, 32, 56, .5);
}

table.data { width: 100%; min-width: 620px; font-size: 14px; }

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

table.data thead th {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .14em;
  color: var(--gold);
  background: rgba(18, 41, 74, .78);
  white-space: nowrap;
}

table.data .num,
table.data th.num { text-align: right; font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

table.data tbody tr { transition: background-color var(--dur) var(--ease); }
table.data tbody tr:hover { background: rgba(244, 239, 227, .06); }
table.data tbody tr:last-child td { border-bottom: 0; }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--muted);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease),
              background-color var(--dur) var(--ease);
}

.chip:hover { border-color: var(--gold); color: var(--snow); }

.chip[aria-pressed="true"] {
  background: var(--cinnabar);
  border-color: var(--cinnabar);
  color: var(--paper);
}

.chapter-nav__list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 18px;
  padding: 12px 0;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.chapter-nav__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 4px 0;
  font-size: 13.5px;
  color: var(--slate);
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.chapter-nav__link:hover { color: var(--snow); border-bottom-color: var(--gold); }

.chapter-nav__link[aria-current="true"] { color: var(--gold); border-bottom-color: var(--cinnabar); }

/* --- 13. 面包屑 ----------------------------------------------------------- */
.breadcrumb { padding: clamp(14px, 2vw, 22px) 0 0; font-size: 13px; color: var(--slate); }

.breadcrumb__list { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }

.breadcrumb__item { display: inline-flex; align-items: center; gap: 6px; }

.breadcrumb__item + .breadcrumb__item::before { content: "／"; color: rgba(216, 163, 60, .6); }

.breadcrumb a { border-bottom: 1px solid transparent; transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease); }
.breadcrumb a:hover { color: var(--gold); border-bottom-color: var(--gold); }
.breadcrumb [aria-current="page"] { color: var(--snow); }

/* --- 14. 页脚 ------------------------------------------------------------- */
.site-footer {
  margin-top: clamp(48px, 7vw, 96px);
  padding-top: clamp(38px, 5vw, 70px);
  background-image: linear-gradient(180deg, rgba(18, 41, 74, .66), rgba(10, 26, 47, 1));
  border-top: 1px solid var(--line);
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 3.4fr) minmax(0, 4.6fr) minmax(0, 3.2fr);
  gap: clamp(24px, 4vw, 60px);
  padding-bottom: clamp(28px, 4vw, 52px);
}

.footer-brand__name {
  font-family: var(--font-display);
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 700;
  letter-spacing: .07em;
}

.footer-brand__statement {
  max-width: 42ch;
  margin-top: 12px;
  font-size: 14.5px;
  line-height: 1.85;
  color: #B9C6D8;
}

.footer-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 22px; }

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--gap);
}

.footer-col__title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--gold);
}

.footer-col__list li + li { margin-top: 10px; }

.footer-col__list a {
  font-size: 14px;
  color: #C6D2E2;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer-col__list a:hover { color: var(--snow); border-bottom-color: var(--gold); }

.footer-contact__list { display: grid; gap: 12px; }

.footer-contact__row {
  display: grid;
  grid-template-columns: 5em minmax(0, 1fr);
  gap: 10px;
  font-size: 13.5px;
}

.footer-contact__row dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--slate);
}

.footer-contact__row dd { color: #DCE4EF; overflow-wrap: anywhere; }

.footer-contact__note {
  margin-top: 16px;
  padding-left: 10px;
  border-left: 2px solid rgba(216, 163, 60, .5);
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--slate);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
  padding: 18px 0 clamp(22px, 3vw, 30px);
  border-top: 1px solid var(--line-soft);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--slate);
}

.footer-base__copy { color: #A9B6C8; }
.footer-base__copy span[data-year] { font-family: var(--font-mono); color: var(--gold); }

.to-top {
  margin-left: auto;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 12.5px;
  letter-spacing: .12em;
  color: var(--snow);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur) var(--ease), visibility var(--dur) var(--ease),
              background-color var(--dur) var(--ease), color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

.to-top[data-visible] { opacity: 1; visibility: visible; }

.to-top:hover { background: var(--paper); color: var(--ink); border-color: var(--gold); }

/* --- 15. 显现动效 --------------------------------------------------------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 500ms var(--ease), transform 500ms var(--ease);
}

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

/* --- 16. 响应式 ----------------------------------------------------------- */
@media (max-width: 1120px) {
  .frame-top {
    grid-template-columns: minmax(0, 1fr) auto;
    row-gap: 10px;
  }

  .header-data {
    grid-column: 1 / -1;
    justify-content: flex-start;
    order: 3;
  }

  .footer-top { grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr); }
  .footer-contact { grid-column: 1 / -1; }
}

@media (max-width: 899px) {
  .nav-toggle { display: flex; }

  .frame-nav { display: none; }

  .frame-nav[data-open] {
    display: block;
    animation: navDrop 220ms var(--ease) both;
  }

  .frame-nav__list { flex-direction: column; border-top: 1px solid var(--line-soft); }

  .frame-nav__item {
    flex: 1 1 auto;
    border-right: 0;
    border-bottom: 1px solid var(--line-soft);
  }

  .frame-nav__item:first-child { border-left: 0; }

  .frame-nav__link {
    padding: 15px 0;
    font-size: 15px;
    border-bottom: 0;
    border-left: 2px solid transparent;
  }

  .frame-nav__link:hover,
  .frame-nav__link[aria-current="page"] { border-bottom: 0; border-left-color: var(--cinnabar); }

  .frame-nav__link[aria-current="page"] { padding-left: 12px; }

  .header-actions .btn { padding: 11px 16px; font-size: 14px; }
}

@keyframes navDrop {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: none; }
}

@media (max-width: 767px) {
  .frame-edges { display: none; }

  .footer-top { grid-template-columns: minmax(0, 1fr); }
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px 18px; }

  .header-data { font-size: 11.5px; letter-spacing: .02em; }
  .data-tick { display: none; }

  .footer-base { flex-direction: column; align-items: flex-start; gap: 10px; }
  .to-top { margin-left: 0; }

  .figure--framed .figure__frame { box-shadow: 5px 5px 0 -1px rgba(216, 163, 60, .16); }
}

@media (max-width: 480px) {
  .header-actions { gap: 8px; }
  .header-actions .btn--ghost { display: none; }
  .brand__tagline { letter-spacing: .1em; }
  .figure__frame { aspect-ratio: 3 / 2; }
}

/* --- 17. 减弱动效 --------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

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

  .js [data-reveal] { opacity: 1; transform: none; }
  .plate--lift:hover { transform: none; }
  .figure:hover .figure__frame > img { transform: none; }
  .frame-progress__bar { transition: none; }
}