/* =========================================================
   今年会主站 · 共享样式表 /assets/site.css
   框架式导航 / 极简文字建筑 / 日落金 × 天山雪青
   ========================================================= */

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

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

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

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

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

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

a { color: var(--teal); text-underline-offset: 3px; }

hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 0;
}

/* ---------- 2. 变量 ---------- */
:root {
  /* 色彩 */
  --gold: #E08A2E;
  --gold-lt: #F3C27C;
  --teal: #1F5E6B;
  --teal-lt: #CFE2E5;
  --deep: #0E3A44;
  --red: #D33A2C;
  --red-deep: #B22F23;
  --sand: #F6EFE3;
  --ink: #3A444E;
  --data: #46A7B8;
  --white: #FFFFFF;

  --ink-soft: rgba(58, 68, 78, .72);
  --line: rgba(31, 94, 107, .16);
  --line-strong: rgba(31, 94, 107, .34);

  /* 尺度 */
  --top-h: 66px;
  --rail-w: 156px;
  --radius: 14px;
  --radius-sm: 9px;
  --wrap: 1260px;
  --gutter: clamp(18px, 4vw, 46px);

  /* 字体 */
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC",
    "Noto Sans CJK SC", "Microsoft YaHei", system-ui, -apple-system,
    "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo,
    Consolas, "Courier New", monospace;

  /* 动效 */
  --ease: cubic-bezier(.22, .61, .36, 1);
  --dur: .19s;
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  padding-top: var(--top-h);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
  background-color: var(--sand);
  background-image:
    radial-gradient(1080px 420px at 6% -8%, rgba(224, 138, 46, .14), transparent 62%),
    radial-gradient(900px 380px at 106% 2%, rgba(70, 167, 184, .13), transparent 60%);
  background-repeat: no-repeat;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

@media (min-width: 1024px) {
  body { padding-left: var(--rail-w); }
}

h1, h2, h3, h4 {
  line-height: 1.25;
  color: var(--deep);
  font-weight: 800;
  letter-spacing: -.01em;
}

::selection {
  background: var(--gold-lt);
  color: var(--deep);
}

/* 画册尺度标题 */
.display {
  font-weight: 300;
  font-size: clamp(2.8rem, 6.2vw, 6rem);
  line-height: 1.03;
  letter-spacing: -.025em;
  color: var(--deep);
  margin: 0;
  text-wrap: balance;
}

.display strong {
  font-weight: 900;
  color: var(--teal);
}

.display em {
  font-style: normal;
  font-weight: 900;
  color: var(--red);
}

.title-lg {
  font-size: clamp(1.9rem, 3.6vw, 2.9rem);
  font-weight: 300;
  line-height: 1.15;
  letter-spacing: -.02em;
  color: var(--deep);
  margin: 0;
}

.title-lg strong {
  font-weight: 900;
  color: var(--teal);
}

.title-md {
  font-size: clamp(1.25rem, 1.8vw, 1.55rem);
  font-weight: 800;
  color: var(--deep);
  margin: 0;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .13em;
  color: var(--teal);
}

.eyebrow::before {
  content: "";
  display: block;
  flex: none;
  width: 26px;
  height: 2px;
  background: var(--gold);
}

.lede {
  max-width: 36em;
  font-size: clamp(1rem, 1.15vw, 1.0625rem);
  line-height: 1.9;
  color: var(--ink);
}

.mono-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .03em;
  color: var(--data);
}

.prose {
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--ink);
}

.prose p {
  margin: 0 0 1.1em;
  max-width: 36em;
}

.prose h2 {
  margin: 1.9em 0 .6em;
  font-size: 1.35rem;
}

.prose h3 {
  margin: 1.5em 0 .5em;
  font-size: 1.1rem;
}

.prose a {
  color: var(--teal);
  text-decoration: underline;
  text-decoration-color: rgba(31, 94, 107, .4);
  text-underline-offset: 3px;
}

.prose a:hover {
  color: var(--red);
  text-decoration-color: var(--red);
}

.prose ul,
.prose ol {
  margin: 0 0 1.2em;
  padding-left: 1.25em;
  max-width: 36em;
}

.prose ul li {
  position: relative;
  list-style: none;
  margin-bottom: .5em;
}

.prose ul li::before {
  content: "";
  position: absolute;
  left: -1.15em;
  top: .75em;
  width: 6px;
  height: 6px;
  border-radius: 2px;
  background: var(--gold);
}

.prose ol { list-style: decimal; }
.prose ol li { margin-bottom: .5em; }

/* ---------- 4. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: 12px;
  z-index: 200;
  padding: 11px 20px;
  border-radius: 0 0 10px 10px;
  background: var(--red);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transform: translateY(-130%);
  transition: transform .18s var(--ease);
}

.skip-link:focus-visible,
.skip-link:focus {
  transform: translateY(0);
  color: #fff;
  outline: 2px solid var(--deep);
  outline-offset: 2px;
}

/* ---------- 5. 顶边框架 ---------- */
.frame-top {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--top-h);
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 24px);
  padding-inline: clamp(14px, 2.2vw, 30px);
  background: rgba(246, 239, 227, .96);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--line);
  z-index: 70;
}

.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  flex: 0 0 auto;
  text-decoration: none;
  color: inherit;
}

.brand-mark {
  position: relative;
  flex: none;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  overflow: hidden;
  background: linear-gradient(168deg, var(--gold-lt) 0%, var(--gold) 58%, #B96A18 100%);
}

.brand-mark::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 58%;
  background: var(--deep);
  clip-path: polygon(0 100%, 22% 34%, 40% 74%, 60% 12%, 78% 62%, 92% 30%, 100% 100%);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-name {
  font-size: 17px;
  font-weight: 900;
  letter-spacing: .01em;
  color: var(--deep);
}

.brand-tag {
  margin-top: 2px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .02em;
  color: var(--teal);
}

.frame-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: clamp(12px, 1.8vw, 24px);
}

.frame-utils {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.4vw, 22px);
}

.util-link {
  display: inline-block;
  padding: 6px 0;
  font-size: 13.5px;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.util-link:hover {
  color: var(--teal);
  border-bottom-color: var(--gold);
}

.frame-cta { flex: none; }

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 16px 9px 13px;
  border: 1.5px solid var(--line-strong);
  border-radius: 999px;
  background: transparent;
  color: var(--teal);
  font-size: 13.5px;
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.nav-toggle:hover {
  background: rgba(31, 94, 107, .08);
  border-color: var(--teal);
}

.nav-toggle-lines {
  position: relative;
  flex: none;
  width: 16px;
  height: 10px;
}

.nav-toggle-lines::before,
.nav-toggle-lines::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: currentColor;
  transition: transform .2s var(--ease), top .2s var(--ease), bottom .2s var(--ease);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle-lines::before {
  top: 4px;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-lines::after {
  bottom: 4px;
  transform: rotate(-45deg);
}

.nav-toggle-text { display: inline-block; }

/* 阅读进度条 */
.frame-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 0;
  height: 3px;
  z-index: 2;
  background: linear-gradient(90deg, var(--gold) 0%, var(--gold-lt) 45%, var(--red) 100%);
  transition: width .1s linear;
}

/* ---------- 6. 左侧竖边导航 ---------- */
.frame-rail {
  position: fixed;
  top: var(--top-h);
  left: 0;
  bottom: 0;
  width: var(--rail-w);
  display: flex;
  flex-direction: column;
  padding: 26px 16px 22px 14px;
  overflow: hidden auto;
  background: var(--deep);
  color: var(--sand);
  border-right: 1px solid rgba(246, 239, 227, .1);
  z-index: 65;
}

.rail-index {
  margin: 0 0 14px;
  padding-left: 12px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .18em;
  color: var(--gold-lt);
}

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

.rail-item { list-style: none; }

.rail-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 10px 8px 10px 12px;
  border-left: 3px solid transparent;
  border-radius: 0 8px 8px 0;
  color: rgba(246, 239, 227, .72);
  font-size: 14px;
  line-height: 1.35;
  text-decoration: none;
  transition: color var(--dur) var(--ease),
    background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

.rail-link:hover {
  color: #fff;
  background: rgba(246, 239, 227, .09);
  border-left-color: var(--gold);
  transform: translateX(4px);
}

.rail-link[aria-current="page"] {
  color: #fff;
  font-weight: 800;
  background: rgba(211, 58, 44, .2);
  border-left-color: var(--red);
}

.rail-num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .06em;
  color: var(--gold);
}

.rail-link[aria-current="page"] .rail-num { color: var(--gold-lt); }

.rail-label { display: inline-block; }

.rail-foot {
  margin-top: auto;
  padding: 16px 8px 0 12px;
  border-top: 1px solid rgba(246, 239, 227, .14);
  font-family: var(--font-mono);
  font-size: 10.5px;
  line-height: 1.7;
  letter-spacing: .02em;
  color: rgba(246, 239, 227, .5);
}

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1.5px solid transparent;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease),
    color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--red);
  color: #fff;
}

.btn-primary:hover {
  background: var(--red-deep);
  color: #fff;
  transform: translateY(-2px);
}

.btn-gold {
  background: var(--gold);
  color: #40260A;
}

.btn-gold:hover {
  background: #CF7A20;
  color: #40260A;
  transform: translateY(-2px);
}

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

.btn-ghost:hover {
  background: rgba(31, 94, 107, .07);
  border-color: var(--teal);
  color: var(--teal);
  transform: translateY(-2px);
}

.btn-on-deep {
  background: transparent;
  border-color: rgba(246, 239, 227, .34);
  color: var(--sand);
}

.btn-on-deep:hover {
  background: rgba(246, 239, 227, .12);
  border-color: var(--gold-lt);
  color: #fff;
  transform: translateY(-2px);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 13px;
}

/* ---------- 8. 容器与网格 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.wrap-narrow {
  width: 100%;
  max-width: 860px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(36px, 5.6vw, 84px); }
.section--tight { padding-block: clamp(22px, 3.4vw, 46px); }

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2.2vw, 30px);
}

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

/* ---------- 9. 面板 / 标签 ---------- */
.panel {
  padding: clamp(20px, 2.4vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.panel--sand {
  background: var(--sand);
  border-color: rgba(31, 94, 107, .12);
}

.panel--deep {
  background: var(--deep);
  border-color: transparent;
  color: rgba(246, 239, 227, .88);
}

.panel--deep .panel-title,
.panel--deep h2,
.panel--deep h3 { color: var(--sand); }

.panel-title {
  margin: 0 0 12px;
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--deep);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--teal-lt);
  color: var(--teal);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .04em;
  line-height: 1.5;
}

.tag--gold {
  background: var(--gold-lt);
  color: #5A3406;
}

.tag--red {
  background: rgba(211, 58, 44, .12);
  color: var(--red);
}

/* ---------- 10. 面包屑 ---------- */
.breadcrumb {
  margin: 0 0 22px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .03em;
  color: var(--ink-soft);
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
}

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

.breadcrumb-list li + li::before {
  content: "/";
  margin: 0 9px;
  color: rgba(58, 68, 78, .4);
}

.breadcrumb-list a {
  color: var(--teal);
  text-decoration: none;
  border-bottom: 1px solid rgba(31, 94, 107, .3);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.breadcrumb-list a:hover {
  color: var(--red);
  border-bottom-color: var(--red);
}

.breadcrumb-list [aria-current="page"] {
  color: var(--ink);
  font-weight: 700;
}

/* ---------- 11. 索引列表 ---------- */
.index-list { border-top: 1px solid var(--line); }

.index-list li { border-bottom: 1px solid var(--line); }

.index-link {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 6px;
  color: var(--ink);
  text-decoration: none;
  transition: color var(--dur) var(--ease),
    padding-left var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.index-link:hover {
  color: var(--teal);
  padding-left: 16px;
  background: rgba(224, 138, 46, .08);
}

.index-num {
  flex: none;
  width: 2.8em;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .04em;
  color: var(--gold);
}

.index-title {
  flex: 1 1 auto;
  min-width: 0;
  font-weight: 700;
  color: var(--deep);
}

.index-meta {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .03em;
  color: var(--ink-soft);
}

/* ---------- 12. 图片容器 ---------- */
.figure { margin: 0; }

.media {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  border-radius: var(--radius);
  background-image: linear-gradient(152deg, var(--gold-lt) 0%, var(--gold) 40%, var(--teal) 100%);
  background-color: var(--gold);
  isolation: isolate;
}

.media > img,
.media > picture > img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media--wide { aspect-ratio: 16 / 9; }
.media--band { aspect-ratio: 21 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--square { aspect-ratio: 1 / 1; }
.media--portrait { aspect-ratio: 3 / 4; }
.media--tall { aspect-ratio: 2 / 3; }

.media--ridge::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 40%;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(14, 58, 68, 0) 0%, rgba(14, 58, 68, .62) 100%);
  clip-path: polygon(0 100%, 16% 44%, 33% 74%, 52% 16%, 70% 62%, 86% 32%, 100% 100%);
}

.media-cap {
  margin-top: 9px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .03em;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ---------- 13. 页脚 ---------- */
.site-foot {
  position: relative;
  margin-top: clamp(48px, 7vw, 110px);
  padding-top: clamp(44px, 6vw, 80px);
  background: var(--deep);
  color: rgba(246, 239, 227, .84);
  font-size: 14px;
}

.site-foot::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--gold) 0%, var(--red) 48%, var(--teal) 100%);
}

.foot-inner {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 60px);
}

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

.foot-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  text-decoration: none;
  color: var(--sand);
}

.foot-brand .brand-mark {
  width: 26px;
  height: 26px;
}

.foot-brand-name {
  font-size: 19px;
  font-weight: 900;
  letter-spacing: .01em;
  color: var(--sand);
}

.foot-tag {
  margin: 0 0 10px;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(246, 239, 227, .88);
}

.foot-meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.8;
  letter-spacing: .02em;
  color: rgba(246, 239, 227, .55);
}

.foot-cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  gap: clamp(20px, 3vw, 44px);
}

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

.foot-col-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--gold-lt);
}

.foot-col-title::before {
  content: "";
  display: block;
  width: 20px;
  height: 2px;
  margin-bottom: 10px;
  background: var(--gold);
}

.foot-list {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.foot-list a {
  display: inline-block;
  padding-bottom: 1px;
  border-bottom: 1px solid transparent;
  color: rgba(246, 239, 227, .8);
  font-size: 14px;
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.foot-list a:hover {
  color: #fff;
  border-bottom-color: var(--gold);
}

.foot-list a[aria-current="page"] {
  color: var(--gold-lt);
  font-weight: 700;
}

.foot-contact {
  margin-top: clamp(32px, 4.4vw, 58px);
  border-top: 1px solid rgba(246, 239, 227, .12);
  background: rgba(246, 239, 227, .06);
}

.foot-contact-inner {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: clamp(22px, 3vw, 34px) var(--gutter);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px 34px;
}

.foot-contact-text {
  flex: 1 1 380px;
  min-width: 0;
}

.foot-contact-line {
  margin: 0 0 8px;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(246, 239, 227, .9);
}

.foot-contact-line b {
  font-family: var(--font-mono);
  font-weight: 400;
  letter-spacing: .02em;
  color: var(--gold-lt);
  word-break: break-all;
}

.foot-sla {
  margin: 0;
  font-size: 13px;
  line-height: 1.8;
  color: rgba(246, 239, 227, .6);
}

.foot-copy {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 14px;
  border: 1px solid rgba(246, 239, 227, .3);
  border-radius: 999px;
  background: rgba(246, 239, 227, .08);
  color: var(--sand);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .02em;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    color var(--dur) var(--ease);
}

.copy-btn:hover {
  background: rgba(224, 138, 46, .22);
  border-color: var(--gold-lt);
  color: #fff;
}

.copy-btn[data-copied="true"] {
  background: var(--gold);
  border-color: var(--gold);
  color: #3A2408;
}

.copy-note {
  flex-basis: 100%;
  min-height: 1.2em;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .02em;
  color: var(--gold-lt);
}

.foot-base {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 18px var(--gutter) 30px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 28px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .03em;
  color: rgba(246, 239, 227, .5);
}

.foot-legal { margin: 0; }

.foot-cr {
  margin: 0 0 0 auto;
}

/* ---------- 14. 显现 ---------- */
.has-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
}

.has-reveal [data-reveal].is-in {
  opacity: 1;
  transform: none;
  transition: opacity .55s ease-out, transform .55s ease-out;
}

/* ---------- 15. 焦点 ---------- */
:focus { outline: none; }

:focus-visible {
  outline: 2px solid var(--red);
  outline-offset: 2px;
  border-radius: 3px;
}

.frame-rail :focus-visible,
.site-foot :focus-visible {
  outline-color: var(--gold-lt);
}

.frame-rail .rail-link:focus-visible {
  outline-offset: -2px;
}

/* ---------- 16. 响应式 ---------- */
@media (min-width: 780px) {
  .foot-inner {
    grid-template-columns: minmax(230px, 1fr) minmax(0, 1.75fr);
  }
}

@media (max-width: 1023.98px) {
  :root { --rail-w: 0px; }

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

  .frame-top { z-index: 88; }

  .frame-rail {
    top: var(--top-h);
    bottom: auto;
    height: calc(100vh - var(--top-h));
    height: calc(100dvh - var(--top-h));
    width: min(86vw, 330px);
    padding-top: 24px;
    transform: translateX(-102%);
    transition: transform .26s var(--ease);
    box-shadow: 22px 0 48px rgba(14, 58, 68, .26);
    z-index: 86;
  }

  .frame-rail[data-open] { transform: translateX(0); }

  body[data-open] { overflow: hidden; }

  body[data-open]::after {
    content: "";
    position: fixed;
    inset: var(--top-h) 0 0 0;
    background: rgba(14, 58, 68, .44);
    z-index: 84;
  }
}

@media (max-width: 900px) {
  .frame-utils { display: none; }
}

@media (max-width: 860px) {
  .grid-12 { grid-template-columns: minmax(0, 1fr); }

  .span-3, .span-4, .span-5, .span-6,
  .span-7, .span-8, .span-9, .span-12 {
    grid-column: 1 / -1;
  }
}

@media (max-width: 560px) {
  :root { --top-h: 60px; }

  .frame-cta { display: none; }
  .brand-tag { display: none; }
  .foot-cr { margin-left: 0; }
}

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

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

  .has-reveal [data-reveal],
  .has-reveal [data-reveal].is-in {
    opacity: 1 !important;
    transform: none !important;
  }

  .frame-progress { transition: none; }
}