/* ============================================================
   鼎博中心 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 头部 / 页脚 / 基础组件
   ============================================================ */

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

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

body,
h1, h2, h3, h4, h5, h6,
p, ul, ol, li, dl, dd, dt,
figure, blockquote, fieldset, legend {
  margin: 0;
  padding: 0;
}

ul, ol { list-style: none; }

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

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

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

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

hr { border: 0; }

[hidden] { display: none !important; }

/* ---------- 2. 变量 ---------- */
:root {
  --db-ink: #12100E;
  --db-brown: #241B14;
  --db-copper: #A9762F;
  --db-copper-bright: #D9A85E;
  --db-copper-deep: #7A5218;
  --db-celadon: #5B7A6B;
  --db-celadon-light: #9BB3A4;
  --db-cinnabar: #A6332A;
  --db-paper: #E9E3D7;
  --db-cream: #F6F2E9;
  --db-rock: #8A8377;
  --db-line: #C6BDAB;

  --db-serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", STSong, "FangSong", "SimSun", serif;
  --db-sans: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --db-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --db-header-h: 76px;
  --db-max: 1240px;
  --db-radius: 2px;
  --db-shadow: 0 1px 0 rgba(18, 16, 14, .04), 0 18px 34px -30px rgba(18, 16, 14, .55);
  --db-body-text: #332D26;
}

@media (max-width: 900px) {
  :root { --db-header-h: 62px; }
}

/* ---------- 3. 基础排版 ---------- */
html {
  scroll-padding-top: calc(var(--db-header-h) + 16px);
}

body {
  font-family: var(--db-sans);
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
  color: var(--db-body-text);
  background-color: var(--db-paper);
  background-image:
    repeating-linear-gradient(0deg, rgba(18, 16, 14, .035) 0 1px, transparent 1px 28px),
    repeating-linear-gradient(90deg, rgba(18, 16, 14, .026) 0 1px, transparent 1px 28px);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--db-serif);
  font-weight: 600;
  letter-spacing: .02em;
  line-height: 1.32;
  color: var(--db-ink);
}

h1 { font-size: clamp(28px, 4.2vw, 40px); }
h2 { font-size: clamp(22px, 2.6vw, 28px); }
h3 { font-size: 20px; }
h4 { font-size: 17px; }

p { margin-bottom: 1em; }
p:last-child { margin-bottom: 0; }

strong, b { font-weight: 600; color: var(--db-ink); }

small { font-size: 13px; }

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

.db-header :focus-visible,
.db-footer :focus-visible {
  outline-color: var(--db-copper-bright);
}

/* ---------- 4. 布局工具 ---------- */
.db-container {
  width: 100%;
  max-width: var(--db-max);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

.db-container--wide { max-width: 1440px; }

.db-main { display: block; padding-top: var(--db-header-h); }
.db-main--overlay { padding-top: 0; }

.db-grid {
  display: grid;
  gap: 24px;
}

.db-grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

.db-grid--split {
  grid-template-columns: minmax(232px, 3fr) minmax(0, 9fr);
  align-items: start;
  gap: 32px;
}

.db-col-3 { grid-column: span 3; }
.db-col-4 { grid-column: span 4; }
.db-col-6 { grid-column: span 6; }
.db-col-8 { grid-column: span 8; }
.db-col-9 { grid-column: span 9; }
.db-col-12 { grid-column: span 12; }

@media (max-width: 1024px) {
  .db-grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .db-col-3, .db-col-4 { grid-column: span 3; }
  .db-col-6, .db-col-8, .db-col-9 { grid-column: span 6; }
  .db-grid--split { grid-template-columns: 1fr; gap: 24px; }
}

@media (max-width: 640px) {
  .db-container { padding-left: 18px; padding-right: 18px; }
  .db-grid--12 { grid-template-columns: 1fr; gap: 18px; }
  .db-col-3, .db-col-4, .db-col-6, .db-col-8, .db-col-9, .db-col-12 { grid-column: span 1; }
}

/* ---------- 5. 章节与背景分区 ---------- */
.db-section { padding: 72px 0; }
.db-section--tight { padding: 44px 0; }

.db-section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 28px;
}

.db-kicker {
  display: block;
  font-family: var(--db-mono);
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--db-copper-deep);
  margin-bottom: 10px;
}

.db-section__title { font-size: clamp(22px, 2.6vw, 28px); }

.db-rule {
  position: relative;
  height: 1px;
  background: var(--db-line);
  margin: 22px 0;
}

.db-rule::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 72px;
  height: 1px;
  background: var(--db-copper);
}

.db-lead {
  font-size: 17px;
  line-height: 1.9;
  color: #3A342C;
  max-width: 66ch;
}

.db-band {
  padding: 60px 0;
  background: var(--db-cream);
  border-top: 1px solid var(--db-line);
  border-bottom: 1px solid var(--db-line);
}

.db-band--dark {
  background: var(--db-brown);
  border-color: rgba(217, 168, 94, .25);
  color: #C9BFB0;
}

.db-band--ink {
  background: var(--db-ink);
  border-color: rgba(217, 168, 94, .25);
  color: #C9BFB0;
}

.db-band--celadon {
  background: rgba(155, 179, 164, .3);
  border-color: var(--db-celadon-light);
}

.db-band--dark h1, .db-band--dark h2, .db-band--dark h3, .db-band--dark h4,
.db-band--ink h1, .db-band--ink h2, .db-band--ink h3, .db-band--ink h4 {
  color: var(--db-cream);
}

.db-band--dark .db-kicker, .db-band--ink .db-kicker { color: var(--db-copper-bright); }
.db-band--dark .db-rule, .db-band--ink .db-rule { background: rgba(217, 168, 94, .28); }
.db-band--dark .db-lead, .db-band--ink .db-lead { color: #BFB4A4; }

/* ---------- 6. 面板 ---------- */
.db-panel {
  background: var(--db-cream);
  border: 1px solid var(--db-line);
  border-radius: var(--db-radius);
  box-shadow: var(--db-shadow);
}

.db-panel__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 15px 22px;
  background: rgba(198, 189, 171, .24);
  border-bottom: 1px solid var(--db-line);
}

.db-panel__title {
  font-family: var(--db-serif);
  font-size: 16px;
  letter-spacing: .04em;
  color: var(--db-ink);
}

.db-panel__body { padding: 22px; }

.db-stack { display: grid; gap: 18px; }
.db-stack--flush { gap: 0; }
.db-stack--flush .db-panel + .db-panel { margin-top: -1px; }

/* ---------- 7. 等宽数字与标签 ---------- */
.db-num,
.db-stat__value,
.db-footer__mono,
.db-footer__line,
.db-footer__title {
  font-family: var(--db-mono);
  font-variant-numeric: tabular-nums;
}

.db-stat {
  display: grid;
  gap: 6px;
  padding: 20px 22px;
  background: var(--db-cream);
  border: 1px solid var(--db-line);
  border-left: 3px solid var(--db-copper);
  border-radius: var(--db-radius);
}

.db-stat__value {
  font-size: clamp(30px, 4.4vw, 40px);
  line-height: 1.05;
  letter-spacing: -.02em;
  color: var(--db-ink);
}

.db-stat__label {
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--db-rock);
}

.db-stat--alert { border-left-color: var(--db-cinnabar); }
.db-stat--alert .db-stat__value { color: var(--db-cinnabar); }
.db-stat--ok { border-left-color: var(--db-celadon); }
.db-stat--ok .db-stat__value { color: #3D5A4B; }

.db-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border: 1px solid var(--db-line);
  border-radius: var(--db-radius);
  background: var(--db-cream);
  font-family: var(--db-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--db-rock);
  white-space: nowrap;
}

.db-tag--copper {
  color: var(--db-copper-deep);
  border-color: var(--db-copper);
  background: rgba(169, 118, 47, .1);
}

.db-tag--celadon {
  color: #3D5A4B;
  border-color: var(--db-celadon-light);
  background: rgba(155, 179, 164, .24);
}

.db-tag--cinnabar {
  color: var(--db-cinnabar);
  border-color: rgba(166, 51, 42, .42);
  background: rgba(166, 51, 42, .08);
}

.db-note {
  padding: 14px 18px;
  border-left: 3px solid var(--db-celadon);
  background: rgba(155, 179, 164, .18);
  font-size: 14px;
  line-height: 1.8;
  color: #33453B;
}

.db-note--alert {
  border-left-color: var(--db-cinnabar);
  background: rgba(166, 51, 42, .08);
  color: #6E241D;
}

/* ---------- 8. 按钮 ---------- */
.db-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: var(--db-radius);
  font-size: 14px;
  letter-spacing: .08em;
  line-height: 1;
  white-space: nowrap;
  transition: background-color .2s ease, color .2s ease, border-color .2s ease;
}

.db-btn--copper {
  border-color: var(--db-copper-bright);
  color: var(--db-copper-bright);
  background: rgba(169, 118, 47, .14);
}

.db-btn--copper:hover {
  background: var(--db-copper-bright);
  color: var(--db-ink);
}

.db-btn--solid {
  background: var(--db-ink);
  border-color: var(--db-ink);
  color: var(--db-cream);
}

.db-btn--solid:hover {
  background: var(--db-copper-deep);
  border-color: var(--db-copper-deep);
}

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

.db-btn--ghost:hover {
  border-color: var(--db-copper);
  color: var(--db-copper-deep);
}

.db-btn--block { width: 100%; }

/* ---------- 9. 面包屑 ---------- */
.db-breadcrumb {
  padding: 16px 0;
  border-bottom: 1px solid var(--db-line);
}

.db-breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--db-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--db-rock);
}

.db-breadcrumb__item {
  display: flex;
  align-items: center;
  gap: 10px;
}

.db-breadcrumb__item + .db-breadcrumb__item::before {
  content: "/";
  color: var(--db-line);
}

.db-breadcrumb__link { color: var(--db-copper-deep); }
.db-breadcrumb__link:hover { text-decoration: underline; }
.db-breadcrumb [aria-current="page"] { color: var(--db-ink); }

/* ---------- 10. 对照表 ---------- */
.db-table__scroll {
  overflow-x: auto;
  background: var(--db-cream);
  border: 1px solid var(--db-line);
  border-radius: var(--db-radius);
  -webkit-overflow-scrolling: touch;
}

.db-table {
  min-width: 660px;
  font-size: 14px;
}

.db-table caption {
  caption-side: top;
  padding: 14px 16px;
  text-align: left;
  font-family: var(--db-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--db-rock);
  border-bottom: 1px solid var(--db-line);
}

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

.db-table thead th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: var(--db-brown);
  color: var(--db-copper-bright);
  font-family: var(--db-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: .12em;
}

.db-table tbody tr:hover { background: rgba(155, 179, 164, .18); }
.db-table tbody tr[data-highlight="true"] { background: rgba(166, 51, 42, .08); }
.db-table tbody tr:last-child th,
.db-table tbody tr:last-child td { border-bottom: 0; }

.db-table .db-num,
.db-table td.db-num { font-size: 14px; }

/* ---------- 11. 图片容器 ---------- */
.db-figure {
  margin: 0;
  background: var(--db-cream);
  border: 1px solid var(--db-line);
  border-radius: var(--db-radius);
  overflow: hidden;
}

.db-figure__media {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background-color: #DCD5C6;
  background-image: repeating-linear-gradient(135deg, rgba(18, 16, 14, .05) 0 2px, transparent 2px 9px);
}

.db-figure__media--wide { aspect-ratio: 16 / 9; }
.db-figure__media--tall { aspect-ratio: 3 / 4; }

.db-figure__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.72) contrast(.98);
}

.db-figure__media::after {
  content: attr(data-label);
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  font-family: var(--db-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: rgba(18, 16, 14, .38);
  text-align: center;
  padding: 0 12px;
}

.db-figure__media:has(img)::after { content: ""; }

.db-figure__caption {
  padding: 10px 14px;
  border-top: 1px solid var(--db-line);
  font-family: var(--db-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--db-rock);
}

/* ---------- 12. 目录树 ---------- */
.db-tree {
  background: var(--db-cream);
  border: 1px solid var(--db-line);
  border-radius: var(--db-radius);
  box-shadow: var(--db-shadow);
}

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

.db-tree__toggle {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 13px 16px;
  font-family: var(--db-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--db-ink);
  text-align: left;
  transition: background-color .2s ease;
}

.db-tree__toggle::after {
  content: "＋";
  font-family: var(--db-mono);
  font-size: 12px;
  color: var(--db-copper);
}

.db-tree__toggle[aria-expanded="true"]::after { content: "－"; }
.db-tree__toggle:hover { background: rgba(198, 189, 171, .3); }

.db-tree__panel {
  overflow: hidden;
  max-height: 0;
  transition: max-height .28s ease;
}

.db-tree__panel[data-open="true"] { max-height: var(--db-tree-max, 1200px); }

.db-tree__list {
  display: grid;
  gap: 2px;
  padding: 4px 8px 12px;
}

.db-tree__link {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: #433C33;
  border-left: 2px solid transparent;
  transition: background-color .2s ease, color .2s ease, border-color .2s ease;
}

.db-tree__link:hover {
  background: rgba(198, 189, 171, .3);
  color: var(--db-ink);
}

.db-tree__link[aria-current="true"],
.db-tree__link[aria-current="page"] {
  border-left-color: var(--db-copper);
  background: rgba(169, 118, 47, .1);
  color: var(--db-copper-deep);
}

/* ---------- 13. 显现动效 ---------- */
html.db-js [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition:
    opacity .34s cubic-bezier(.22, .61, .36, 1),
    transform .34s cubic-bezier(.22, .61, .36, 1);
  transition-delay: calc(var(--db-stagger, 0) * 60ms);
}

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

/* ---------- 14. 头部外壳 ---------- */
.db-skip {
  position: absolute;
  left: 16px;
  top: 8px;
  z-index: 120;
  padding: 10px 16px;
  background: var(--db-ink);
  color: var(--db-cream);
  border-radius: var(--db-radius);
  font-size: 14px;
  transform: translateY(-220%);
  transition: transform .2s ease;
}

.db-skip:focus { transform: translateY(0); }

.db-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 60;
  color: var(--db-cream);
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color .3s ease, color .3s ease, border-color .3s ease, box-shadow .3s ease;
}

.db-header[data-scrolled="true"],
.db-header[data-nav-open="true"] {
  background: rgba(233, 227, 215, .97);
  color: var(--db-ink);
  border-bottom-color: var(--db-line);
  box-shadow: 0 1px 0 rgba(18, 16, 14, .06), 0 16px 30px -28px rgba(18, 16, 14, .6);
}

.db-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: rgba(169, 118, 47, .16);
  overflow: hidden;
}

.db-progress__bar {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--db-copper), var(--db-copper-bright));
  transition: transform .12s linear;
}

.db-header__inner {
  max-width: var(--db-max);
  margin: 0 auto;
  height: var(--db-header-h);
  padding-left: 24px;
  padding-right: 24px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.db-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.db-brand__seal {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--db-copper-bright);
  border-radius: var(--db-radius);
  background: rgba(169, 118, 47, .18);
  color: var(--db-copper-bright);
  font-family: var(--db-serif);
  font-size: 16px;
  line-height: 1;
}

.db-header[data-scrolled="true"] .db-brand__seal,
.db-header[data-nav-open="true"] .db-brand__seal {
  border-color: var(--db-copper-deep);
  background: rgba(169, 118, 47, .12);
  color: var(--db-copper-deep);
}

.db-brand__text {
  display: grid;
  gap: 2px;
}

.db-brand__name {
  font-family: var(--db-serif);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: .1em;
  line-height: 1.1;
}

.db-brand__meta {
  font-family: var(--db-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: rgba(217, 168, 94, .85);
}

.db-header[data-scrolled="true"] .db-brand__meta,
.db-header[data-nav-open="true"] .db-brand__meta { color: var(--db-copper-deep); }

.db-nav {
  display: flex;
  align-items: center;
  gap: 26px;
  margin-left: auto;
}

.db-nav__list {
  display: flex;
  align-items: center;
  gap: 22px;
}

.db-nav__link {
  position: relative;
  display: inline-block;
  padding: 6px 0;
  font-size: 14px;
  letter-spacing: .06em;
  color: inherit;
  transition: color .2s ease;
}

.db-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--db-copper-bright);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .24s ease;
}

.db-nav__link:hover::after,
.db-nav__link:focus-visible::after { transform: scaleX(1); }

.db-nav__link[aria-current="page"] {
  color: var(--db-copper-bright);
}

.db-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--db-copper-bright);
}

.db-nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  padding: 9px 13px;
  border: 1px solid rgba(217, 168, 94, .55);
  border-radius: var(--db-radius);
  color: inherit;
  font-size: 13px;
  letter-spacing: .14em;
}

.db-nav-toggle__bars {
  display: grid;
  gap: 5px;
  width: 18px;
}

.db-nav-toggle__bar {
  display: block;
  height: 1px;
  background: currentColor;
  transition: transform .24s ease;
}

.db-nav-toggle[aria-expanded="true"] .db-nav-toggle__bar:first-child {
  transform: translateY(3px) rotate(45deg);
}

.db-nav-toggle[aria-expanded="true"] .db-nav-toggle__bar:last-child {
  transform: translateY(-3px) rotate(-45deg);
}

@media (min-width: 901px) {
  .db-header[data-scrolled="true"] .db-nav__link[aria-current="page"],
  .db-header[data-nav-open="true"] .db-nav__link[aria-current="page"] {
    color: var(--db-copper-deep);
  }

  .db-header[data-scrolled="true"] .db-nav__link[aria-current="page"]::after,
  .db-header[data-nav-open="true"] .db-nav__link[aria-current="page"]::after {
    background: var(--db-copper);
  }

  .db-header[data-scrolled="true"] .db-nav__cta,
  .db-header[data-nav-open="true"] .db-nav__cta {
    border-color: var(--db-copper-deep);
    color: var(--db-copper-deep);
    background: rgba(169, 118, 47, .1);
  }

  .db-header[data-scrolled="true"] .db-nav__cta:hover,
  .db-header[data-nav-open="true"] .db-nav__cta:hover {
    background: var(--db-copper-deep);
    color: var(--db-cream);
  }
}

@media (max-width: 900px) {
  .db-header__inner { gap: 12px; }

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

  .db-header[data-scrolled="true"] .db-nav-toggle,
  .db-header[data-nav-open="true"] .db-nav-toggle {
    border-color: var(--db-copper-deep);
    color: var(--db-copper-deep);
  }

  .db-nav {
    position: fixed;
    left: 0;
    right: 0;
    top: var(--db-header-h);
    bottom: 0;
    margin-left: 0;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 8px;
    padding: 18px 24px 40px;
    background: var(--db-brown);
    color: #D8CFC0;
    border-top: 1px solid rgba(217, 168, 94, .3);
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity .24s ease, transform .24s ease, visibility .24s;
  }

  .db-nav[data-open="true"] {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

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

  .db-nav__item { border-bottom: 1px solid rgba(217, 168, 94, .16); }

  .db-nav__link {
    display: block;
    padding: 16px 4px;
    font-size: 15px;
    color: #D8CFC0;
  }

  .db-nav__link::after { display: none; }

  .db-nav__link[aria-current="page"] { color: var(--db-copper-bright); }

  .db-nav__cta {
    margin-top: 22px;
    align-self: flex-start;
  }
}

@media (max-width: 560px) {
  .db-brand__meta { display: none; }
  .db-brand__name { font-size: 17px; }
}

/* ---------- 15. 页脚外壳 ---------- */
.db-footer {
  background: var(--db-brown);
  color: #CFC6B7;
  font-size: 14px;
  border-top: 3px solid var(--db-copper);
}

.db-footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.3fr 1fr;
  gap: 40px;
  padding: 62px 0 46px;
}

.db-footer__col--brand { max-width: 350px; }

.db-footer__brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.db-footer .db-brand__seal {
  width: 34px;
  height: 34px;
  border-color: var(--db-copper-bright);
  background: rgba(169, 118, 47, .2);
  color: var(--db-copper-bright);
}

.db-footer__brandname {
  font-family: var(--db-serif);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--db-cream);
}

.db-footer__desc {
  margin-top: 16px;
  line-height: 1.85;
  color: #B4A999;
}

.db-footer__line {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: .06em;
  color: #918878;
}

.db-footer__value {
  display: block;
  margin-top: 3px;
  font-size: 13px;
  color: var(--db-copper-bright);
  word-break: break-all;
}

.db-footer__title {
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(217, 168, 94, .24);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: .18em;
  color: var(--db-copper);
}

.db-footer__list {
  display: grid;
  gap: 10px;
}

.db-footer__link {
  color: #CFC6B7;
  font-size: 14px;
  border-bottom: 1px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}

.db-footer__link:hover {
  color: var(--db-copper-bright);
  border-bottom-color: var(--db-copper-bright);
}

.db-footer__item {
  color: #B4A999;
  line-height: 1.75;
}

.db-footer__note {
  margin-top: 14px;
  font-size: 12.5px;
  line-height: 1.75;
  color: #8F8779;
}

.db-footer__base {
  background: var(--db-ink);
  border-top: 1px solid rgba(217, 168, 94, .18);
}

.db-footer__baseinner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: 16px;
  padding-bottom: 16px;
}

.db-footer__mono {
  font-size: 12px;
  letter-spacing: .06em;
  color: #8F8779;
}

@media (max-width: 1080px) {
  .db-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 34px;
    padding: 50px 0 38px;
  }
}

@media (max-width: 640px) {
  .db-footer__grid {
    grid-template-columns: 1fr;
    gap: 30px;
    padding: 42px 0 30px;
  }
  .db-footer__col--brand { max-width: none; }
}

/* ---------- 16. 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    transition-delay: 0ms !important;
  }

  .db-progress__bar { transition: none; }

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

  .db-nav { transform: none; }
}