/* ==========================================================================
   熊猫赛场 / panda-sports-xiongmao.com.cn
   共享样式表 /assets/site.css
   框架式导航 + 珠宝色档案分区 + 精密网格
   ========================================================================== */

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

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

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

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

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

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

button { background: none; border: 0; cursor: pointer; }

a { color: inherit; }

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

/* ---------- 2. Tokens ---------- */
:root {
  /* 色彩系统 */
  --ink: #0B0D0E;
  --paper: #F7F5F1;
  --teal: #0E3B3A;
  --wine: #5A1B2A;
  --indigo: #2A1F52;
  --bamboo: #4F7A5E;
  --flare: #FF6A1F;
  --grid: #E8EAED;
  --warm: #FFE9DC;
  --mute: #7C848C;

  /* 结构 */
  --rail-w: 72px;
  --top-h: 56px;
  --content-max: 1440px;
  --step: 8px;

  /* 字体 */
  --font-display: 'Source Han Sans SC', 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-head: 'Source Han Sans SC', 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-body: 'Source Han Serif SC', 'Noto Serif SC', 'Songti SC', 'SimSun', serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* 四档字号 */
  --fs-display: clamp(44px, 8vw, 108px);
  --fs-head: clamp(26px, 3vw, 40px);
  --fs-body: 17px;
  --fs-anno: 11px;

  /* 动效 */
  --dur: 320ms;
  --ease: cubic-bezier(.2, .7, .2, 1);

  /* 线 */
  --line: 1px solid var(--ink);
  --line-soft: 1px solid rgba(11, 13, 14, .14);
  --line-invert: 1px solid rgba(247, 245, 241, .26);
}

/* ---------- 3. 中文排版基线 ---------- */
body {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--ink);
  background: var(--paper);
  padding-top: var(--top-h);
  padding-left: var(--rail-w);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

h1 { font-size: var(--fs-display); line-height: 0.94; letter-spacing: -0.02em; }
h2 { font-size: var(--fs-head); }
h3 { font-size: clamp(18px, 1.6vw, 22px); line-height: 1.3; }
h4 { font-size: var(--fs-body); line-height: 1.4; }

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

strong { font-weight: 700; }

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

.v-note {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: var(--fs-anno);
  letter-spacing: 0.24em;
  color: var(--mute);
}

/* ---------- 4. 无障碍 ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 300;
  transform: translateY(-140%);
  background: var(--flare);
  color: var(--ink);
  font-family: var(--font-head);
  font-size: 13px;
  letter-spacing: 0.2em;
  padding: 12px 20px;
  text-decoration: none;
  pointer-events: auto;
  transition: transform var(--dur) var(--ease);
}

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

:focus-visible {
  outline: 2px solid var(--flare);
  outline-offset: 2px;
}

#main-content { scroll-margin-top: var(--top-h); }

/* ---------- 5. 布局基元 ---------- */
.wrap {
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 64px);
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2vw, 24px);
}

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

@media (min-width: 900px) {
  .col-3 { grid-column: span 3; }
  .col-4 { grid-column: span 4; }
  .col-6 { grid-column: span 6; }
  .col-8 { grid-column: span 8; }
  .col-12 { grid-column: span 12; }
}

.band {
  padding-block: clamp(48px, 7vw, 96px);
  padding-inline: clamp(20px, 4vw, 64px);
}

.band--teal { background: var(--teal); color: var(--paper); }
.band--wine { background: var(--wine); color: var(--paper); }
.band--indigo { background: var(--indigo); color: var(--paper); }
.band--grid { background: var(--grid); }

.band--grid + .band--grid { border-top: var(--line-soft); }
.band--teal + .band--wine,
.band--wine + .band--indigo,
.band--indigo + .band--teal { border-top: var(--line); }

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

.mesh {
  background-image:
    linear-gradient(to right, rgba(11, 13, 14, .07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(11, 13, 14, .07) 1px, transparent 1px);
  background-size: 48px 48px;
}

.band--teal .mesh,
.band--wine .mesh,
.band--indigo .mesh {
  background-image:
    linear-gradient(to right, rgba(247, 245, 241, .09) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(247, 245, 241, .09) 1px, transparent 1px);
}

/* ---------- 6. 组件 ---------- */
.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-anno);
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--mute);
  margin-bottom: 12px;
}

.band--teal .eyebrow,
.band--wine .eyebrow,
.band--indigo .eyebrow { color: rgba(247, 245, 241, .62); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 14px;
  border-bottom: var(--line-soft);
  margin-bottom: clamp(24px, 3vw, 40px);
}

.band--teal .section-head,
.band--wine .section-head,
.band--indigo .section-head { border-bottom: var(--line-invert); }

.section-head__title {
  font-family: var(--font-head);
  font-size: var(--fs-head);
  font-weight: 700;
  line-height: 1.15;
}

.section-head__note {
  font-family: var(--font-mono);
  font-size: var(--fs-anno);
  letter-spacing: 0.18em;
  color: var(--mute);
}

.band--teal .section-head__note,
.band--wine .section-head__note,
.band--indigo .section-head__note { color: rgba(247, 245, 241, .6); }

.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-anno);
  letter-spacing: 0.16em;
  line-height: 1;
  padding: 5px 9px;
  border: 1px solid var(--ink);
  color: var(--ink);
  background: transparent;
  text-decoration: none;
  white-space: nowrap;
}

.tag--bamboo { background: var(--bamboo); border-color: var(--bamboo); color: var(--paper); }
.tag--flare { background: var(--flare); border-color: var(--flare); color: var(--ink); }
.tag--ink { background: var(--ink); border-color: var(--ink); color: var(--paper); }

.archive-card {
  position: relative;
  background: var(--paper);
  border: var(--line);
  padding: clamp(18px, 2.2vw, 28px);
  padding-top: clamp(28px, 3vw, 40px);
  color: var(--ink);
}

.archive-card > .tag {
  position: absolute;
  top: 0;
  right: 0;
  border-top: 0;
  border-right: 0;
}

.archive-card__title {
  font-family: var(--font-head);
  font-size: clamp(18px, 1.7vw, 23px);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 10px;
}

.archive-card__meta {
  font-family: var(--font-mono);
  font-size: var(--fs-anno);
  letter-spacing: 0.14em;
  color: var(--mute);
  margin-bottom: 14px;
}

.archive-card__body {
  font-size: 15px;
  line-height: 1.8;
}

.conclusion {
  background: var(--grid);
  border-left: 3px solid var(--flare);
  padding: 14px 18px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 15px;
  line-height: 1.6;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.conclusion strong {
  box-shadow: inset 0 -7px 0 var(--flare);
}

.conclusion__label {
  display: block;
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: var(--fs-anno);
  letter-spacing: 0.24em;
  color: var(--mute);
  margin-bottom: 6px;
}

/* 图片容器 */
.img-frame {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  background: var(--grid);
  border: var(--line);
  aspect-ratio: 4 / 3;
}

.img-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(0.14) contrast(1.06);
}

.img-frame--wide { aspect-ratio: 16 / 9; }
.img-frame--tall { aspect-ratio: 3 / 4; }
.img-frame--square { aspect-ratio: 1 / 1; }

.img-frame__caption {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-anno);
  letter-spacing: 0.16em;
  color: var(--mute);
  margin-top: 8px;
}

.band--teal .img-frame__caption,
.band--wine .img-frame__caption,
.band--indigo .img-frame__caption { color: rgba(247, 245, 241, .6); }

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-head);
  font-size: 13px;
  letter-spacing: 0.16em;
  padding: 12px 22px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
  border-radius: 0;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.btn:hover {
  background: var(--flare);
  border-color: var(--flare);
  color: var(--ink);
}

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

.btn--ghost:hover {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

.band--teal .btn,
.band--wine .btn,
.band--indigo .btn {
  background: var(--paper);
  border-color: var(--paper);
  color: var(--ink);
}

.band--teal .btn:hover,
.band--wine .btn:hover,
.band--indigo .btn:hover {
  background: var(--flare);
  border-color: var(--flare);
  color: var(--ink);
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-anno);
  letter-spacing: 0.16em;
  color: var(--mute);
  padding-block: 18px;
}

.breadcrumb a {
  color: var(--mute);
  text-decoration: none;
  border-bottom: 1px solid var(--grid);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.breadcrumb a:hover {
  color: var(--ink);
  border-bottom-color: var(--flare);
}

.breadcrumb__sep { color: var(--mute); }

/* 数据表 */
.data-table {
  width: 100%;
  font-size: 15px;
  background: var(--grid);
}

.data-table th,
.data-table td {
  border: 1px solid rgba(11, 13, 14, .12);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

.data-table th {
  font-family: var(--font-head);
  font-size: 13px;
  letter-spacing: 0.08em;
  background: rgba(11, 13, 14, .06);
}

.data-table .mono { text-align: right; }

/* ---------- 7. 头部框架 ---------- */
.site-header {
  position: fixed;
  inset: 0;
  z-index: 90;
  pointer-events: none;
}

.frame__bar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: var(--top-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-inline: clamp(14px, 2vw, 24px);
  background: var(--paper);
  border-bottom: var(--line);
  pointer-events: auto;
  z-index: 3;
}

.brand {
  display: flex;
  align-items: center;
  gap: clamp(8px, 1.2vw, 16px);
  min-width: 0;
  text-decoration: none;
  color: var(--ink);
}

.brand__name {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.22em;
  white-space: nowrap;
}

.brand__claim {
  font-family: var(--font-head);
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--bamboo);
  white-space: nowrap;
}

.brand__stamp {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--mute);
  border-left: var(--line-soft);
  padding-left: clamp(8px, 1.2vw, 16px);
  white-space: nowrap;
}

.frame__actions {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 20px);
  flex-shrink: 0;
}

.ghost-link {
  font-family: var(--font-head);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--ink);
  text-decoration: none;
  padding-bottom: 3px;
  border-bottom: 2px solid var(--flare);
  white-space: nowrap;
  transition: color var(--dur) var(--ease);
}

.ghost-link:hover { color: var(--flare); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border: var(--line);
  border-radius: 0;
  font-family: var(--font-head);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--ink);
  background: transparent;
}

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 16px;
}

.nav-toggle__bars i {
  display: block;
  height: 1px;
  background: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.nav-toggle[aria-expanded="true"] { background: var(--warm); border-color: var(--flare); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:first-child { transform: translateY(2.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:last-child { transform: translateY(-2.5px) rotate(-45deg); }

.rail-nav {
  position: absolute;
  top: var(--top-h);
  left: 0;
  bottom: 0;
  width: var(--rail-w);
  display: flex;
  flex-direction: column;
  background: var(--paper);
  border-right: var(--line);
  overflow-y: auto;
  overscroll-behavior: contain;
  pointer-events: auto;
  z-index: 3;
  scrollbar-width: thin;
  scrollbar-color: var(--grid) transparent;
}

.rail-nav__list {
  display: flex;
  flex-direction: column;
}

.rail-nav__item {
  display: flex;
  justify-content: center;
  border-bottom: var(--line-soft);
}

.rail-nav__item:first-child { border-top: var(--line-soft); }

.rail-nav__link {
  position: relative;
  display: block;
  writing-mode: vertical-rl;
  font-family: var(--font-head);
  font-size: 13px;
  letter-spacing: 0.3em;
  line-height: 1;
  padding-block: 26px;
  padding-inline: 8px;
  color: var(--ink);
  text-decoration: none;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.rail-nav__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 2px;
  height: 0;
  background: var(--flare);
  transform: translateY(-50%);
  transition: height var(--dur) var(--ease);
}

.rail-nav__link:hover { color: var(--bamboo); }

.rail-nav__link[aria-current="page"] {
  background: var(--warm);
  color: var(--ink);
}

.rail-nav__link[aria-current="page"]::before { height: 24px; }

.nav-veil {
  position: absolute;
  inset: 0;
  z-index: 2;
  background: rgba(11, 13, 14, 0.42);
  opacity: 0;
  visibility: hidden;
  pointer-events: auto;
  transition: opacity var(--dur) var(--ease), visibility var(--dur) var(--ease);
}

.nav-veil[data-open] {
  opacity: 1;
  visibility: visible;
}

html[data-nav-lock] body { overflow: hidden; }

/* ---------- 8. 页脚 ---------- */
.site-footer {
  background: var(--ink);
  color: rgba(247, 245, 241, 0.88);
  padding-right: clamp(20px, 4vw, 64px);
  padding-bottom: clamp(24px, 3vw, 40px);
  padding-top: clamp(40px, 6vw, 80px);
  margin-left: calc(-1 * var(--rail-w));
  width: calc(100% + var(--rail-w));
  padding-left: calc(var(--rail-w) + clamp(20px, 4vw, 64px));
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(160px, 1.25fr) repeat(3, minmax(130px, 1fr));
  gap: clamp(24px, 3vw, 48px);
  padding-bottom: clamp(24px, 3vw, 40px);
  border-bottom: var(--line-invert);
}

.footer-brand__name {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.22em;
  color: var(--paper);
  margin-bottom: 6px;
}

.footer-brand__claim {
  font-family: var(--font-head);
  font-size: 13px;
  letter-spacing: 0.3em;
  color: var(--bamboo);
  margin-bottom: 14px;
}

.footer-brand__mark {
  font-family: var(--font-mono);
  font-size: var(--fs-anno);
  letter-spacing: 0.2em;
  color: var(--mute);
}

.footer-col__title {
  font-family: var(--font-mono);
  font-size: var(--fs-anno);
  font-weight: 400;
  letter-spacing: 0.24em;
  color: var(--mute);
  text-transform: uppercase;
  margin-bottom: 16px;
}

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

.footer-list a {
  font-size: 14px;
  line-height: 1.6;
  color: rgba(247, 245, 241, 0.82);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer-list a:hover {
  color: var(--flare);
  border-bottom-color: var(--flare);
}

.footer-list--plain li {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(247, 245, 241, 0.78);
  word-break: break-word;
}

.footer-label {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-anno);
  letter-spacing: 0.2em;
  color: var(--mute);
  margin-bottom: 2px;
}

.footer-rhythm {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  line-height: 1.8;
  color: rgba(247, 245, 241, 0.6);
  padding-block: clamp(16px, 2vw, 24px);
  border-bottom: var(--line-invert);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: clamp(16px, 2vw, 24px);
  font-family: var(--font-mono);
  font-size: var(--fs-anno);
  letter-spacing: 0.16em;
  color: rgba(247, 245, 241, 0.55);
}

.footer-legal__links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.footer-legal__links a {
  color: rgba(247, 245, 241, 0.72);
  text-decoration: none;
  border-bottom: 1px solid rgba(247, 245, 241, 0.28);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer-legal__links a:hover {
  color: var(--flare);
  border-bottom-color: var(--flare);
}

/* ---------- 9. 动效 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition:
    opacity var(--dur) var(--ease),
    transform var(--dur) var(--ease);
  transition-delay: calc(var(--i, 0) * 60ms);
}

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

/* ---------- 10. 响应式 ---------- */
@media (max-width: 1023px) {
  .footer-top {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .footer-brand { grid-column: span 2; }
}

@media (max-width: 899px) {
  :root { --top-h: 52px; }

  body { padding-left: 0; }

  .brand__stamp { display: none; }

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

  .rail-nav {
    top: auto;
    left: 0;
    right: 0;
    bottom: 0;
    width: auto;
    max-height: 78vh;
    border-right: 0;
    border-top: var(--line);
    padding-bottom: 8px;
    transform: translateY(101%);
    transition: transform var(--dur) var(--ease);
    overflow-y: auto;
  }

  .rail-nav[data-open] { transform: translateY(0); }

  .rail-nav__list { display: block; }

  .rail-nav__item { display: block; }

  .rail-nav__link {
    writing-mode: horizontal-tb;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 24px;
    font-size: 15px;
    letter-spacing: 0.14em;
    line-height: 1.4;
  }

  .rail-nav__link::before {
    top: 50%;
    left: 0;
    width: 2px;
  }

  .rail-nav__link[aria-current="page"]::before { height: 20px; }

  .site-footer {
    margin-left: 0;
    width: 100%;
    padding-left: clamp(20px, 4vw, 64px);
  }
}

@media (max-width: 640px) {
  .brand__claim { display: none; }

  .footer-top {
    grid-template-columns: 1fr;
  }

  .footer-brand { grid-column: span 1; }

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

@media (max-width: 420px) {
  h1 { letter-spacing: -0.015em; }
  .frame__bar { padding-inline: 12px; }
}

/* ---------- 11. Reduced motion ---------- */
@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;
    scroll-behavior: auto !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}