/* =====================================================================
   百利宫中心 BLG · 共享样式表 /assets/site.css
   墨绿档案底色 + 暖金铭牌 + 瓷白阅读面 + 朱砂标记
   ===================================================================== */

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

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

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.8;
  color: var(--black);
  background: var(--porcelain);
  text-rendering: optimizeLegibility;
}

img, svg, video { display: block; max-width: 100%; }
h1, h2, h3, h4, h5, p, ul, ol, figure, blockquote, dl, dd, address { margin: 0; }
ul, ol { padding: 0; list-style: none; }
address { font-style: normal; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }
summary { cursor: pointer; }
:focus-visible { outline: 2px solid var(--gold); outline-offset: 3px; }

/* ---------- tokens ---------- */
:root {
  --ink-900: #082720;
  --ink-800: #0E3B32;
  --ink-600: #1C5A4A;
  --gold: #C9A227;
  --gold-soft: #E8C86A;
  --porcelain: #F4F1E8;
  --bone: #E4DFD2;
  --cinnabar: #B23A2E;
  --black: #101512;
  --slate: #6E7A74;

  --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --serif: "Songti SC", "STSong", "Source Han Serif SC", "Noto Serif CJK SC", "SimSun", serif;
  --mono: ui-monospace, "SFMono-Regular", "Menlo", "Consolas", "Courier New", monospace;

  --shell-w: 1240px;
  --gutter: clamp(18px, 4vw, 40px);
  --gap: clamp(18px, 2.4vw, 32px);
  --cut: 26px;
  --t: 160ms;
  --ease: ease-out;
}

/* ---------- layout ---------- */
.blg-shell {
  width: 100%;
  max-width: var(--shell-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.blg-main { display: block; }

#main-content { scroll-margin-top: 140px; }

.blg-section {
  padding-block: clamp(48px, 7vw, 96px);
  background: var(--porcelain);
  color: var(--black);
}
.blg-section--dark { background: var(--ink-800); color: var(--porcelain); }
.blg-section--deep { background: var(--ink-900); color: var(--porcelain); }
.blg-section--bone { background: var(--bone); color: var(--black); }

.blg-grid { display: grid; gap: var(--gap); }
.blg-grid--7-5 { grid-template-columns: 7fr 5fr; }
.blg-grid--8-4 { grid-template-columns: 8fr 4fr; }
.blg-grid--5-3-4 { grid-template-columns: 5fr 3fr 4fr; }
.blg-grid--split { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.blg-grid--thirds { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.blg-stack { display: flex; flex-direction: column; gap: var(--gap); }
.blg-btn-row { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }

@media (max-width: 900px) {
  .blg-grid--7-5,
  .blg-grid--8-4,
  .blg-grid--5-3-4,
  .blg-grid--split,
  .blg-grid--thirds { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 编号章节体系 ---------- */
.blg-chapter {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(14px, 2.6vw, 32px);
  align-items: start;
  margin-bottom: clamp(20px, 3vw, 36px);
}
.blg-chapter__num {
  font-family: var(--serif);
  font-weight: 800;
  font-size: clamp(52px, 8vw, 104px);
  line-height: 0.78;
  letter-spacing: -0.02em;
  color: var(--ink-600);
  font-variant-numeric: tabular-nums;
  transition: color var(--t) var(--ease);
}
.blg-chapter__kicker {
  display: block;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--slate);
  margin-bottom: 8px;
}
.blg-chapter__title {
  font-family: var(--serif);
  font-weight: 800;
  font-size: clamp(24px, 3.2vw, 36px);
  line-height: 1.28;
  letter-spacing: 0.02em;
}
.blg-chapter__link { display: block; }
.blg-chapter__link:hover .blg-chapter__num { color: var(--cinnabar); }

.blg-section--dark .blg-chapter__num,
.blg-section--deep .blg-chapter__num { color: var(--gold); }
.blg-section--dark .blg-chapter__kicker,
.blg-section--deep .blg-chapter__kicker { color: rgba(232, 200, 106, 0.82); }
.blg-section--dark .blg-chapter__link:hover .blg-chapter__num,
.blg-section--deep .blg-chapter__link:hover .blg-chapter__num { color: var(--cinnabar); }

/* ---------- 文字件 ---------- */
.blg-eyebrow {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--slate);
  margin-bottom: 14px;
}
.blg-lede {
  font-size: clamp(17px, 1.6vw, 19px);
  line-height: 1.9;
  max-width: 64ch;
}
.blg-text { font-size: 16.5px; line-height: 1.85; max-width: 68ch; }
.blg-note { font-size: 13px; line-height: 1.75; letter-spacing: 0.02em; color: var(--slate); }
.blg-rule {
  height: 2px;
  border: 0;
  margin-block: clamp(24px, 4vw, 44px);
  background: linear-gradient(90deg, var(--gold), rgba(201, 162, 39, 0));
}
.blg-section--dark .blg-eyebrow,
.blg-section--deep .blg-eyebrow { color: rgba(232, 200, 106, 0.85); }
.blg-section--dark .blg-note,
.blg-section--deep .blg-note { color: rgba(244, 241, 232, 0.62); }

.blg-list { display: flex; flex-direction: column; gap: 10px; }
.blg-list__item { position: relative; padding-left: 20px; font-size: 16px; line-height: 1.8; }
.blg-list__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 9px;
  height: 2px;
  background: var(--gold);
}

/* ---------- 按钮 ---------- */
.blg-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 24px;
  font-size: 14.5px;
  letter-spacing: 0.1em;
  color: var(--gold);
  background: transparent;
  border: 1px solid var(--gold);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: background var(--t) var(--ease), color var(--t) var(--ease),
              border-color var(--t) var(--ease), transform var(--t) var(--ease);
}
.blg-btn:hover { background: var(--gold); color: var(--ink-900); transform: translateY(-2px); }
.blg-btn--gold { background: var(--gold); color: var(--ink-900); }
.blg-btn--gold:hover { background: var(--gold-soft); border-color: var(--gold-soft); color: var(--ink-900); }
.blg-btn--ghost { border-color: var(--ink-600); color: var(--ink-600); }
.blg-btn--ghost:hover { background: var(--ink-800); border-color: var(--ink-800); color: var(--porcelain); }
.blg-btn--sm { padding: 9px 16px; font-size: 13px; }
.blg-section--dark .blg-btn,
.blg-section--deep .blg-btn { color: var(--gold-soft); border-color: var(--gold); }
.blg-section--dark .blg-btn:hover,
.blg-section--deep .blg-btn:hover { background: var(--gold); color: var(--ink-900); }

/* ---------- 面包屑 ---------- */
.blg-crumb {
  background: var(--porcelain);
  border-bottom: 1px solid var(--bone);
  padding-block: 12px;
}
.blg-crumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--slate);
}
.blg-crumb__item::after { content: "/"; margin-left: 10px; color: rgba(110, 122, 116, 0.55); }
.blg-crumb__item:last-child::after { display: none; }
.blg-crumb__link {
  color: var(--ink-600);
  border-bottom: 1px solid transparent;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease);
}
.blg-crumb__link:hover { color: var(--cinnabar); border-color: var(--cinnabar); }

/* ---------- 切角面板 ---------- */
.blg-panel {
  position: relative;
  background: var(--porcelain);
  color: var(--black);
  padding: clamp(20px, 2.6vw, 32px);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}
.blg-panel::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 5px;
  background: var(--gold);
}
.blg-panel--dark { background: var(--ink-800); color: var(--porcelain); }
.blg-panel--bare { background: transparent; padding: 0; }
.blg-panel--bare::before { display: none; }
.blg-section--bone .blg-panel { background: var(--porcelain); }
.blg-section--dark .blg-panel,
.blg-section--deep .blg-panel { background: var(--ink-900); color: var(--porcelain); }
.blg-panel__title {
  font-family: var(--serif);
  font-weight: 800;
  font-size: 20px;
  letter-spacing: 0.04em;
  margin-bottom: 10px;
}
.blg-panel__text { font-size: 16px; line-height: 1.85; opacity: 0.88; }
.blg-panel__foot {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px dashed rgba(110, 122, 116, 0.5);
  font-size: 13.5px;
  color: var(--slate);
}
.blg-section--dark .blg-panel__foot,
.blg-section--deep .blg-panel__foot {
  border-top-color: rgba(201, 162, 39, 0.32);
  color: rgba(244, 241, 232, 0.6);
}

/* ---------- 铭牌 ---------- */
.blg-plate {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 14px;
  background: var(--ink-800);
  color: var(--porcelain);
  font-size: 13px;
  letter-spacing: 0.14em;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%);
}
.blg-plate__label { color: rgba(232, 200, 106, 0.8); }
.blg-plate__value { font-family: var(--mono); color: var(--gold-soft); }

/* ---------- 数字锚点 ---------- */
.blg-stat-row {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(20px, 4vw, 56px);
  align-items: flex-end;
}
.blg-stat { display: flex; flex-direction: column; gap: 4px; }
.blg-stat__value {
  font-family: var(--serif);
  font-weight: 800;
  font-size: clamp(38px, 5.4vw, 64px);
  line-height: 1;
  color: var(--ink-800);
  font-variant-numeric: tabular-nums;
}
.blg-stat__label { font-size: 13.5px; letter-spacing: 0.12em; color: var(--slate); }
.blg-section--dark .blg-stat__value,
.blg-section--deep .blg-stat__value { color: var(--gold); }
.blg-section--dark .blg-stat__label,
.blg-section--deep .blg-stat__label { color: rgba(244, 241, 232, 0.62); }

/* ---------- 标签 ---------- */
.blg-tag {
  display: inline-block;
  padding: 3px 10px;
  font-size: 12px;
  letter-spacing: 0.12em;
  line-height: 1.6;
  border: 1px solid currentColor;
  color: var(--ink-600);
}
.blg-tag--gold { background: var(--gold); border-color: var(--gold); color: var(--ink-900); }
.blg-tag--red { border-color: var(--cinnabar); color: var(--cinnabar); }

/* ---------- 对照表 ---------- */
.blg-table-wrap {
  overflow-x: auto;
  background: var(--porcelain);
  border: 1px solid var(--bone);
}
.blg-table { min-width: 660px; font-size: 15px; color: var(--black); }
.blg-table caption {
  padding: 14px 16px;
  text-align: left;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--slate);
  border-bottom: 1px solid var(--bone);
}
.blg-table th,
.blg-table td {
  padding: 13px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--bone);
  line-height: 1.7;
}
.blg-table thead th {
  background: var(--ink-800);
  color: var(--porcelain);
  font-weight: 700;
  font-size: 13.5px;
  letter-spacing: 0.08em;
}
.blg-table tbody tr {
  transition: background var(--t) var(--ease), box-shadow var(--t) var(--ease);
}
.blg-table tbody tr:nth-child(even) { background: var(--bone); }
.blg-table tbody tr:hover { background: var(--porcelain); box-shadow: inset 0 0 0 1px var(--gold); }

/* ---------- 图位 ---------- */
.blg-media {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, var(--ink-800), var(--ink-900));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}
.blg-media__img { width: 100%; height: 100%; object-fit: cover; }
.blg-media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 10px 14px;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: rgba(244, 241, 232, 0.9);
  background: linear-gradient(to top, rgba(8, 39, 32, 0.88), rgba(8, 39, 32, 0));
}
.blg-media--wide { aspect-ratio: 21 / 9; }
.blg-media--tall { aspect-ratio: 3 / 4; }
.blg-media--square { aspect-ratio: 1 / 1; }
.blg-media--plate {
  aspect-ratio: 4 / 5;
  background: repeating-linear-gradient(115deg, var(--ink-800) 0 12px, var(--ink-900) 12px 24px);
}

/* ---------- 纵向时间轴 ---------- */
.blg-timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: clamp(18px, 2.4vw, 28px);
  padding-left: 30px;
}
.blg-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(var(--gold), rgba(201, 162, 39, 0.12));
}
.blg-timeline__item { position: relative; }
.blg-timeline__node {
  position: absolute;
  left: -30px;
  top: 7px;
  width: 18px;
  height: 18px;
  background: var(--ink-800);
  border: 2px solid var(--gold);
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
  transition: background var(--t) var(--ease);
}
.blg-timeline__item:hover .blg-timeline__node { background: var(--gold); }
.blg-timeline__time {
  display: block;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--gold);
  margin-bottom: 4px;
}
.blg-timeline__body { font-size: 16px; line-height: 1.8; }

/* ---------- 右侧编号目录 ---------- */
.blg-anchor {
  position: sticky;
  top: 132px;
  padding-left: 16px;
  border-left: 2px solid var(--bone);
}
.blg-anchor__title {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--slate);
  margin-bottom: 12px;
}
.blg-anchor__list { display: flex; flex-direction: column; gap: 2px; }
.blg-anchor__link {
  display: flex;
  gap: 10px;
  padding: 5px 0;
  font-size: 14px;
  color: var(--ink-600);
  border-bottom: 1px solid transparent;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease);
}
.blg-anchor__link:hover,
.blg-anchor__link[data-current] { color: var(--cinnabar); border-color: var(--cinnabar); }

/* ---------- 折叠问答 ---------- */
.blg-faq { border-top: 1px solid var(--bone); }
.blg-faq__item { border-bottom: 1px solid var(--bone); }
.blg-faq__q {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 16px 4px;
  font-size: 16.5px;
  font-weight: 700;
  color: var(--ink-800);
  list-style: none;
}
.blg-faq__q::-webkit-details-marker { display: none; }
.blg-faq__q::after {
  content: "+";
  font-family: var(--mono);
  font-size: 20px;
  line-height: 1;
  color: var(--gold);
  transition: transform var(--t) var(--ease);
}
.blg-faq__item[open] .blg-faq__q::after { content: "\2013"; }
.blg-faq__a { padding: 0 4px 18px; font-size: 16px; line-height: 1.85; max-width: 72ch; }

/* =====================================================================
   页头
   ===================================================================== */
.skip-link {
  position: absolute;
  top: 0;
  left: 50%;
  z-index: 200;
  transform: translate(-50%, -160%);
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--ink-900);
  background: var(--gold);
  transition: transform var(--t) var(--ease);
}
.skip-link:focus { transform: translate(-50%, 0); }

.blg-header {
  position: sticky;
  top: 0;
  z-index: 60;
  color: var(--porcelain);
  background: var(--ink-800);
}

.blg-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: rgba(201, 162, 39, 0.22);
  pointer-events: none;
}
.blg-progress__bar {
  display: block;
  height: 100%;
  width: 0;
  background: var(--cinnabar);
  transition: width 120ms linear;
}

/* 上层：资料条 */
.blg-utility {
  background: var(--ink-900);
  border-bottom: 1px solid rgba(201, 162, 39, 0.28);
}
.blg-utility__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px var(--gap);
  min-height: 38px;
  padding-block: 7px;
}
.blg-utility__tagline {
  flex: 1 1 300px;
  min-width: 0;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: rgba(244, 241, 232, 0.58);
}
.blg-utility__nav { margin-left: auto; }
.blg-utility__list { display: flex; flex-wrap: wrap; gap: 4px 18px; }
.blg-utility__link {
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--gold-soft);
  border-bottom: 1px solid transparent;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease);
}
.blg-utility__link:hover { color: var(--porcelain); border-color: var(--gold); }
.blg-utility__stamp {
  display: none;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: rgba(244, 241, 232, 0.5);
  white-space: nowrap;
}

/* 下层：品牌 + 主导航 */
.blg-masthead {
  background-color: var(--ink-800);
  background-image: repeating-linear-gradient(
    115deg,
    rgba(232, 200, 106, 0.05) 0 1px,
    rgba(232, 200, 106, 0) 1px 9px
  );
}
.blg-masthead__inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: clamp(16px, 3vw, 40px);
  padding-block: clamp(12px, 1.6vw, 20px);
}

.blg-brand { display: flex; align-items: center; gap: 14px; flex: 0 0 auto; }
.blg-brand__mark {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--ink-900);
  background: var(--gold);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
  transition: background var(--t) var(--ease), color var(--t) var(--ease);
}
.blg-brand:hover .blg-brand__mark { background: var(--gold-soft); }
.blg-brand__text { display: flex; flex-direction: column; line-height: 1.25; }
.blg-brand__name {
  font-family: var(--serif);
  font-weight: 800;
  font-size: clamp(19px, 2vw, 23px);
  letter-spacing: 0.14em;
}
.blg-brand__line {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.28em;
  color: rgba(232, 200, 106, 0.85);
}

.blg-nav { margin-left: auto; }
.blg-nav__list { display: flex; align-items: stretch; gap: 2px; }
.blg-nav__item { display: flex; }
.blg-nav__link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 7px;
  padding: 10px 12px;
  border: 1px solid transparent;
  transition: background var(--t) var(--ease), border-color var(--t) var(--ease),
              color var(--t) var(--ease);
}
.blg-nav__num {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: rgba(232, 200, 106, 0.7);
  transition: color var(--t) var(--ease);
}
.blg-nav__text {
  font-size: 14.5px;
  letter-spacing: 0.06em;
  color: var(--porcelain);
  transition: color var(--t) var(--ease);
}
.blg-nav__link:hover { background: var(--gold); border-color: var(--gold); }
.blg-nav__link:hover .blg-nav__text,
.blg-nav__link:hover .blg-nav__num { color: var(--ink-900); }
.blg-nav__link[aria-current="page"] {
  background: rgba(201, 162, 39, 0.12);
  border-color: rgba(201, 162, 39, 0.55);
}
.blg-nav__link[aria-current="page"] .blg-nav__num { color: var(--gold-soft); }
.blg-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 5px;
  height: 2px;
  background: var(--gold);
}

.blg-nav-toggle {
  display: none;
  margin-left: auto;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  font-size: 12.5px;
  letter-spacing: 0.16em;
  color: var(--gold-soft);
  border: 1px solid rgba(201, 162, 39, 0.55);
  transition: background var(--t) var(--ease), color var(--t) var(--ease);
}
.blg-nav-toggle:hover { background: var(--gold); color: var(--ink-900); }
.blg-nav-toggle__bars {
  width: 18px;
  height: 2px;
  background: currentColor;
  box-shadow: 0 6px 0 currentColor, 0 -6px 0 currentColor;
}
.blg-nav-toggle__label { line-height: 1; }

/* 收缩态：资料条变细条，常驻备案与文档入口 */
.blg-header[data-compact] .blg-utility__tagline { display: none; }
.blg-header[data-compact] .blg-utility__stamp { display: block; }
.blg-header[data-compact] .blg-utility__inner { min-height: 26px; padding-block: 3px; }
.blg-header[data-compact] .blg-masthead__inner { padding-block: 9px; }

/* 移动导航 */
@media (max-width: 1080px) {
  .blg-nav-toggle { display: inline-flex; }
  .blg-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    z-index: 5;
    margin-left: 0;
    background: var(--ink-900);
    border-top: 1px solid rgba(201, 162, 39, 0.3);
    border-bottom: 3px solid var(--gold);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--t) var(--ease);
  }
  .blg-nav[data-open] { max-height: 72vh; overflow-y: auto; }
  .blg-nav__list { flex-direction: column; gap: 0; padding: 6px 0 14px; }
  .blg-nav__item { display: block; }
  .blg-nav__link {
    padding: 14px 4px;
    border: 0;
    border-bottom: 1px dashed rgba(201, 162, 39, 0.22);
  }
  .blg-nav__link[aria-current="page"] { background: transparent; border-color: rgba(201, 162, 39, 0.22); }
  .blg-nav__link[aria-current="page"]::after { left: 4px; right: auto; width: 26px; bottom: 8px; }
  .blg-nav__text { font-size: 15.5px; }
  .blg-nav__num { font-size: 12px; }
}

@media (max-width: 720px) {
  .blg-utility__tagline { display: none; }
  .blg-utility__stamp { display: block; margin-left: auto; }
  .blg-utility__nav { margin-left: 0; }
  .blg-utility__list { gap: 4px 14px; }
  .blg-utility__link { font-size: 12px; }
  .blg-brand__mark { width: 40px; height: 40px; font-size: 13px; }
  .blg-brand__line { letter-spacing: 0.2em; }
}

/* =====================================================================
   页脚
   ===================================================================== */
.blg-footer {
  background: var(--ink-900);
  color: var(--porcelain);
}
.blg-footer__rule {
  height: 6px;
  background: repeating-linear-gradient(
    115deg,
    var(--gold) 0 14px,
    rgba(201, 162, 39, 0) 14px 28px
  );
}
.blg-footer__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 2fr);
  gap: clamp(28px, 4vw, 64px);
  padding-block: clamp(40px, 5vw, 72px);
}
.blg-footer__brand { display: inline-flex; align-items: center; gap: 14px; }
.blg-footer__mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--ink-900);
  background: var(--gold);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
}
.blg-footer__name {
  font-family: var(--serif);
  font-weight: 800;
  font-size: clamp(22px, 2.6vw, 30px);
  letter-spacing: 0.16em;
}
.blg-footer__summary {
  margin-top: 18px;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(244, 241, 232, 0.72);
}
.blg-footer__addr {
  margin-top: 22px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(244, 241, 232, 0.66);
}
.blg-footer__addr b {
  margin-right: 10px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--gold-soft);
}
.blg-footer__cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(18px, 3vw, 36px);
}
.blg-footer__col-title {
  padding-bottom: 10px;
  margin-bottom: 14px;
  font-size: 12.5px;
  letter-spacing: 0.2em;
  font-weight: 700;
  color: var(--gold);
  border-bottom: 1px solid rgba(201, 162, 39, 0.35);
}
.blg-footer__links { display: flex; flex-direction: column; gap: 9px; }
.blg-footer__link {
  font-size: 14.5px;
  color: rgba(244, 241, 232, 0.8);
  border-bottom: 1px solid transparent;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease);
}
.blg-footer__link:hover { color: var(--gold-soft); border-color: var(--gold-soft); }
.blg-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding-block: 18px;
  border-top: 1px solid rgba(201, 162, 39, 0.22);
}
.blg-footer__legal {
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: rgba(244, 241, 232, 0.5);
}
.blg-top {
  padding: 8px 16px;
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--gold-soft);
  border: 1px solid rgba(201, 162, 39, 0.55);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--t) var(--ease), visibility var(--t) var(--ease),
              background var(--t) var(--ease), color var(--t) var(--ease);
}
.blg-top[data-visible] { opacity: 1; visibility: visible; }
.blg-top:hover { background: var(--gold); color: var(--ink-900); }

@media (max-width: 900px) {
  .blg-footer__inner { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 620px) {
  .blg-footer__cols { grid-template-columns: minmax(0, 1fr); gap: 22px; }
}

/* ---------- 可访问性 / 动效收敛 ---------- */
@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;
  }
}