/* =========================================================
   安博体育站 · 共享样式 /assets/site.css
   框架式导航 · 展览画册节奏 · 夜场墨绿 ↔ 荧光橙
   ========================================================= */

/* ---------- 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 { display: block; max-width: 100%; }

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

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

:focus-visible {
  outline: 2px solid #FF6A1A;
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 2. 变量 ---------- */
:root {
  --ink: #0A2B24;
  --ink-2: #12403A;
  --ink-3: #1B5249;

  --flame: #FF6A1A;
  --flame-soft: #FFB27A;
  --flame-deep: #C24A05;

  --paper: #FAF7F0;
  --cool: #E4E8E6;
  --gray: #9AA5A1;

  --text: #22302C;
  --text-2: #3A4A45;

  --ice: #7FB2C9;
  --warn: #F2C744;

  --font-display: "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC", "Noto Sans CJK SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --rail-w: 264px;
  --gutter: clamp(20px, 4vw, 56px);
  --gap: clamp(18px, 2.4vw, 32px);
  --maxw: 1240px;

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

  --dur: 200ms;
  --ease: cubic-bezier(.25, .1, .25, 1);
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--paper);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(10, 43, 36, .035) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(10, 43, 36, .035) 1px, transparent 1px);
  background-size: 120px 120px;
}

#main-content { display: block; scroll-margin-top: 80px; }

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: -70px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 200;
  padding: 12px 22px;
  border-radius: 0 0 14px 14px;
  background: var(--flame);
  color: var(--ink);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .1em;
  transition: top var(--dur) var(--ease);
}

.skip-link:focus { top: 0; }

/* ---------- 4. 框架头部 ---------- */
.site-head {
  position: fixed;
  top: 0; left: 0; bottom: 0;
  width: var(--rail-w);
  z-index: 60;
}

.read-bar {
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  height: 3px;
  z-index: 80;
  background: rgba(10, 43, 36, .1);
}

.read-bar__fill {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--flame) 0%, var(--flame-soft) 100%);
  transition: transform 120ms linear;
}

.rail {
  position: relative;
  height: 100%;
  display: flex;
  flex-direction: column;
  gap: 26px;
  padding: 36px 22px 26px;
  overflow-y: auto;
  color: var(--paper);
  border-right: 1px solid rgba(250, 247, 240, .08);
  background-color: var(--ink);
  background-image:
    radial-gradient(120% 55% at 10% 104%, rgba(255, 106, 26, .18) 0%, rgba(255, 106, 26, 0) 62%),
    radial-gradient(90% 38% at 106% -4%, rgba(127, 178, 201, .16) 0%, rgba(127, 178, 201, 0) 70%);
}

.rail__brand {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.rail__logo {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.rail__glyph {
  flex: none;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 14px 20px 12px 22px;
  background: var(--flame);
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 500;
  letter-spacing: 0;
}

.rail__wordmark { display: block; min-width: 0; }

.rail__name {
  display: block;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 400;
  letter-spacing: .08em;
  color: var(--paper);
  white-space: nowrap;
}

.rail__line {
  display: block;
  margin-top: 2px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .3em;
  color: var(--flame-soft);
}

.rail__tagline {
  padding-left: 12px;
  border-left: 2px solid var(--flame);
  font-size: 12.5px;
  line-height: 1.7;
  letter-spacing: .04em;
  color: rgba(250, 247, 240, .62);
}

.rail__nav { flex: 1 1 auto; min-height: 0; }

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

.nav-link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 12px;
  border-radius: 12px;
  font-size: 15px;
  letter-spacing: .05em;
  color: rgba(250, 247, 240, .7);
  transition: color var(--dur) var(--ease),
              background-color var(--dur) var(--ease),
              transform var(--dur) var(--ease);
}

.nav-link__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: rgba(250, 247, 240, .35);
  transition: color var(--dur) var(--ease);
}

.nav-link:hover {
  color: var(--paper);
  background-color: rgba(250, 247, 240, .07);
  transform: translateX(4px);
}

.nav-link:hover .nav-link__idx { color: var(--flame-soft); }

.nav-link[aria-current="page"] {
  color: var(--paper);
  background-color: var(--ink-2);
}

.nav-link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 3px;
  height: 18px;
  border-radius: 2px;
  background: var(--flame);
  transform: translateY(-50%);
}

.nav-link[aria-current="page"] .nav-link__idx { color: var(--flame); }

.rail__foot {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding-top: 18px;
  border-top: 1px solid rgba(250, 247, 240, .1);
}

.rail__status {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  font-size: 11.5px;
  line-height: 1.65;
  letter-spacing: .06em;
  color: rgba(250, 247, 240, .6);
}

.rail__dot {
  flex: none;
  width: 7px;
  height: 7px;
  margin-top: 6px;
  border-radius: 50%;
  background: var(--flame);
  animation: rail-pulse 2.4s var(--ease) infinite;
}

@keyframes rail-pulse {
  0%   { box-shadow: 0 0 0 0 rgba(255, 106, 26, .55); }
  70%  { box-shadow: 0 0 0 7px rgba(255, 106, 26, 0); }
  100% { box-shadow: 0 0 0 0 rgba(255, 106, 26, 0); }
}

.rail__cta { width: 100%; }

.rail__toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 15px;
  border-radius: 999px;
  border: 1px solid rgba(250, 247, 240, .24);
  color: var(--paper);
  font-size: 12.5px;
  letter-spacing: .14em;
  transition: background-color var(--dur) var(--ease),
              color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

.rail__burger {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 16px;
}

.rail__burger span {
  display: block;
  height: 1.5px;
  border-radius: 2px;
  background: var(--flame);
  transition: background-color var(--dur) var(--ease);
}

.rail__toggle[aria-expanded="true"] {
  background: var(--flame);
  border-color: var(--flame);
  color: var(--ink);
}

.rail__toggle[aria-expanded="true"] .rail__burger span { background: var(--ink); }

/* ---------- 5. 按钮与标签 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: .08em;
  line-height: 1.2;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease),
              color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

.btn--primary {
  background: var(--flame);
  color: var(--ink);
}

.btn--primary:hover {
  background: var(--flame-soft);
  color: var(--ink);
}

.btn--ghost {
  border-color: rgba(250, 247, 240, .28);
  color: var(--paper);
}

.btn--ghost:hover {
  border-color: var(--flame);
  color: var(--flame-soft);
}

.btn--line {
  border-color: rgba(34, 48, 44, .2);
  color: var(--text);
}

.btn--line:hover {
  border-color: var(--flame);
  color: var(--flame-deep);
}

.slab {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 26px 7px 15px;
  background: var(--flame);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  clip-path: polygon(0 0, 100% 0, calc(100% - 14px) 100%, 0 100%);
  transition: transform var(--dur) var(--ease);
}

.slab:hover { transform: translateX(6px); }

.slab--ink {
  background: var(--ink);
  color: var(--flame-soft);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 13px;
  border: 1px solid rgba(10, 43, 36, .14);
  border-radius: 999px;
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--text-2);
}

.chip--flame {
  border-color: rgba(255, 106, 26, .38);
  background: rgba(255, 106, 26, .1);
  color: var(--flame-deep);
}

.chip--warn {
  border-color: rgba(242, 199, 68, .55);
  background: rgba(242, 199, 68, .18);
  color: #7A5C00;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.rule {
  height: 1px;
  border: 0;
  background: var(--cool);
}

/* ---------- 6. 容器与网格 ---------- */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.wrap--narrow { max-width: 860px; }

.section { padding: clamp(48px, 7vw, 96px) 0; }

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

.col-3  { grid-column: span 3; }
.col-4  { grid-column: span 4; }
.col-5  { grid-column: span 5; }
.col-6  { grid-column: span 6; }
.col-7  { grid-column: span 7; }
.col-8  { grid-column: span 8; }
.col-9  { grid-column: span 9; }
.col-12 { grid-column: span 12; }
.shift-1 { grid-column-start: 2; }

/* ---------- 7. 文字组件 ---------- */
.display {
  font-family: var(--font-display);
  font-weight: 200;
  letter-spacing: .045em;
  line-height: 1.06;
  color: var(--ink);
  text-wrap: balance;
}

.display--xl { font-size: clamp(44px, 8.4vw, 120px); letter-spacing: .05em; }
.display--l  { font-size: clamp(32px, 5vw, 64px); }
.display--m  { font-size: clamp(24px, 3vw, 38px); font-weight: 300; }
.display--on-ink { color: var(--paper); }

.lede {
  max-width: 34em;
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.8;
  color: var(--text-2);
}

.prose { font-size: 16.5px; }

.prose p {
  max-width: 36em;
  margin-bottom: 1.1em;
  line-height: 1.8;
  color: var(--text-2);
}

.prose p:last-child { margin-bottom: 0; }

.prose strong { color: var(--ink); font-weight: 600; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--flame-deep);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--flame);
}

.index-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--gray);
}

/* ---------- 8. 面板与数据 ---------- */
.panel {
  padding: clamp(22px, 3vw, 36px);
  border: 1px solid rgba(10, 43, 36, .08);
  border-radius: var(--r-lg);
  background: #FFFFFF;
}

.panel--ink {
  border-color: rgba(250, 247, 240, .1);
  background: var(--ink-2);
  color: rgba(250, 247, 240, .82);
}

.panel--ink .display,
.panel--ink strong { color: var(--paper); }

.panel--soft {
  border-color: transparent;
  background: var(--cool);
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-left: 14px;
  border-left: 2px solid var(--cool);
}

.stat__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--ink);
}

.stat__num em {
  font-style: normal;
  color: var(--flame);
}

.stat__label {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--gray);
}

/* ---------- 9. 面包屑 ---------- */
.breadcrumb {
  padding: 18px 0 0;
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--gray);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 10px;
}

.breadcrumb li:not(:last-child)::after {
  content: "/";
  color: rgba(154, 165, 161, .7);
}

.breadcrumb a:hover { color: var(--flame-deep); }
.breadcrumb [aria-current="page"] { color: var(--text); }

/* ---------- 10. 图片容器 ---------- */
.figure { margin: 0; }

.figure__frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border-radius: var(--r-lg);
  background: var(--cool);
}

.figure__frame--wide   { aspect-ratio: 21 / 9; }
.figure__frame--tall   { aspect-ratio: 4 / 5; }
.figure__frame--square { aspect-ratio: 1 / 1; }

.figure__img,
.figure__frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.figure__frame--ph {
  background-image: repeating-linear-gradient(135deg, rgba(10, 43, 36, .06) 0 12px, rgba(10, 43, 36, 0) 12px 24px);
}

.figure__cap {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: .06em;
  color: var(--gray);
}

.figure--organic .figure__frame {
  border-radius: 120px 28px 96px 30px;
}

/* ---------- 11. 章节高亮体系 ---------- */
.chapter {
  position: relative;
  scroll-margin-top: 96px;
}

.chapter__index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--gray);
  transition: color var(--dur) var(--ease);
}

.chapter[data-active="true"] .chapter__index { color: var(--flame); }

.chapter-rail {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 13px;
}

.chapter-rail a {
  padding-left: 12px;
  border-left: 2px solid transparent;
  letter-spacing: .06em;
  color: var(--gray);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.chapter-rail a:hover { color: var(--text-2); }

.chapter-rail a.is-current {
  color: var(--ink);
  border-left-color: var(--flame);
}

/* ---------- 12. 显现动效 ---------- */
.js-on [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
}

.js-on [data-reveal].is-in {
  opacity: 1;
  transform: none;
  transition: opacity 420ms var(--ease), transform 420ms var(--ease);
}

/* ---------- 13. 页脚 ---------- */
.site-foot {
  position: relative;
  overflow: hidden;
  margin-top: clamp(56px, 8vw, 110px);
  padding: clamp(48px, 7vw, 88px) 0 28px;
  color: rgba(250, 247, 240, .78);
  background-color: var(--ink);
  background-image:
    radial-gradient(80% 60% at 100% 100%, rgba(255, 106, 26, .16) 0%, rgba(255, 106, 26, 0) 68%),
    radial-gradient(60% 45% at 0% 0%, rgba(127, 178, 201, .12) 0%, rgba(127, 178, 201, 0) 70%);
}

.foot__inner {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.foot__top {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 28px;
  border-bottom: 1px solid rgba(250, 247, 240, .12);
}

.foot__logo {
  display: inline-block;
  font-family: var(--font-display);
  font-size: clamp(26px, 3.4vw, 40px);
  font-weight: 300;
  letter-spacing: .14em;
  color: var(--paper);
}

.foot__line {
  margin-top: 8px;
  font-size: 13px;
  letter-spacing: .08em;
  color: rgba(250, 247, 240, .55);
}

.foot__update {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 9px 16px;
  border: 1px solid rgba(255, 106, 26, .3);
  border-radius: 999px;
  background: var(--ink-2);
  font-size: 12px;
  letter-spacing: .08em;
  color: rgba(250, 247, 240, .7);
}

.foot__clock {
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--flame-soft);
}

.foot__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr)) minmax(0, 1.7fr);
  gap: clamp(24px, 3.4vw, 52px);
  padding: 40px 0 36px;
}

.foot__title {
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .22em;
  color: var(--flame-soft);
}

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

.foot__link {
  display: inline-block;
  padding: 6px 0;
  font-size: 14px;
  letter-spacing: .06em;
  color: rgba(250, 247, 240, .72);
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.foot__link:hover {
  color: var(--flame-soft);
  transform: translateX(4px);
}

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

.contact-row {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 10px;
  border-bottom: 1px dashed rgba(250, 247, 240, .12);
}

.contact-row__key {
  flex: none;
  width: 42px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: rgba(250, 247, 240, .45);
}

.contact-row__val {
  font-size: 13.5px;
  line-height: 1.7;
  letter-spacing: .04em;
  color: rgba(250, 247, 240, .82);
  word-break: break-word;
}

.foot__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 28px;
  padding-top: 22px;
  border-top: 1px solid rgba(250, 247, 240, .1);
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(250, 247, 240, .45);
}

.foot__legal-item { margin: 0; }

.foot__legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
}

.foot__legal-links a {
  color: rgba(250, 247, 240, .62);
  transition: color var(--dur) var(--ease);
}

.foot__legal-links a:hover { color: var(--flame-soft); }

/* ---------- 14. 响应式 ---------- */
@media (min-width: 1025px) {
  body { padding-left: var(--rail-w); }
}

@media (max-width: 1024px) {
  body { padding-left: 0; }

  .site-head {
    position: sticky;
    top: 0;
    left: auto;
    bottom: auto;
    width: 100%;
    height: auto;
  }

  .rail {
    height: auto;
    max-height: 100vh;
    gap: 0;
    padding: 12px 16px 14px;
    overflow-y: auto;
    border-right: 0;
    border-bottom: 1px solid rgba(250, 247, 240, .1);
  }

  .rail__brand { width: 100%; }

  .rail__glyph { width: 36px; height: 36px; font-size: 17px; }

  .rail__name { font-size: 15px; }

  .rail__tagline { display: none; }

  .rail__toggle { display: inline-flex; }

  .rail__nav {
    display: none;
    margin-top: 14px;
    padding-top: 14px;
    border-top: 1px solid rgba(250, 247, 240, .1);
  }

  .rail[data-open] .rail__nav {
    display: block;
    max-height: 52vh;
    overflow-y: auto;
  }

  .nav-link { padding: 12px 10px; }

  .rail__foot {
    display: none;
    margin-top: 16px;
    padding-top: 16px;
  }

  .rail[data-open] .rail__foot { display: flex; }

  .read-bar { height: 2px; }

  .foot__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .foot__col--wide { grid-column: span 2; }
}

@media (max-width: 980px) {
  .col-3, .col-4, .col-5, .col-6,
  .col-7, .col-8, .col-9 { grid-column: span 12; }
  .shift-1 { grid-column-start: auto; }
}

@media (max-width: 640px) {
  body { font-size: 15.5px; }

  .foot__top { flex-direction: column; align-items: flex-start; }

  .foot__grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
    padding: 32px 0 28px;
  }

  .foot__col--wide { grid-column: span 1; }

  .contact-row { flex-direction: column; gap: 2px; }

  .contact-row__key { width: auto; }

  .foot__legal { flex-direction: column; align-items: flex-start; }
}

/* ---------- 15. 无障碍与动效降级 ---------- */
@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-on [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .read-bar__fill { transition: none; }
}