/* ==========================================================================
   四季体育 · 共享样式 /assets/site.css
   纸面分区 + 深色数据面板 + 等宽数字
   ========================================================================== */

:root {
  --paper: #F3EDE0;
  --paper-2: #E7DECB;
  --ink: #1E1A16;
  --panel: #14161A;
  --accent: #D9452B;
  --spring: #2E7D32;
  --summer: #F57C00;
  --autumn: #F9A825;
  --winter: #1565C0;
  --fluoro: #B8F03C;
  --muted: #6B6155;
  --rule: #C9BFA9;

  --rail-w: 108px;
  --bar-h: 62px;
  --wrap: 1280px;
  --radius: 2px;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);

  --font-sans: 'PingFang SC', 'Source Han Sans SC', 'Noto Sans SC', 'Microsoft YaHei',
    system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, 'SFMono-Regular', 'JetBrains Mono', 'Cascadia Mono',
    Menlo, Consolas, 'Liberation Mono', monospace;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--bar-h) + 18px);
}

body {
  margin: 0;
  padding-left: var(--rail-w);
  padding-top: var(--bar-h);
  background-color: var(--paper);
  background-image: repeating-linear-gradient(
    0deg,
    rgba(30, 26, 22, 0.016) 0 1px,
    transparent 1px 3px
  );
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16.5px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 0.6em;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

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

ul, ol { margin: 0 0 1em; padding-left: 1.3em; }

img, svg, video { max-width: 100%; height: auto; }

button { font: inherit; color: inherit; }

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

code, kbd, samp, time, .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

::selection { background: var(--autumn); color: var(--ink); }

a:focus-visible,
button:focus-visible,
summary:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--radius);
}

.panel :focus-visible,
.site-footer :focus-visible,
.brand-rail :focus-visible {
  outline-color: var(--fluoro);
}

#main-content { display: block; scroll-margin-top: calc(var(--bar-h) + 20px); }

/* ---------- 跳过链接 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: calc(var(--rail-w) + 12px);
  z-index: 200;
  transform: translateY(-220%);
  padding: 10px 18px;
  background: var(--ink);
  color: var(--paper);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  border-radius: var(--radius);
  transition: transform 0.2s var(--ease);
}
.skip-link:focus { transform: none; }

/* ---------- 页头骨架 ---------- */
.site-header { position: relative; }

/* 左侧品牌轨道 */
.brand-rail {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--rail-w);
  z-index: 60;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  padding: 22px 10px 18px;
  background: var(--panel);
  border-right: 1px solid rgba(201, 191, 169, 0.22);
  overflow: hidden;
}

.brand-rail__mark {
  writing-mode: vertical-rl;
  text-orientation: upright;
  padding: 14px 6px;
  font-size: 21px;
  font-weight: 800;
  letter-spacing: 0.24em;
  color: var(--paper);
  text-decoration: none;
  border-top: 3px solid var(--accent);
  border-bottom: 1px solid rgba(201, 191, 169, 0.28);
  transition: color 0.2s var(--ease);
}
.brand-rail__mark:hover { color: var(--fluoro); }
.brand-rail__name { display: inline; }

.brand-rail__domain {
  margin: 0;
  width: 100%;
  font-family: var(--font-mono);
  font-size: 9px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: #7E7566;
  text-align: center;
  overflow-wrap: anywhere;
}

.season-meter {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 7px;
  width: 46px;
}
.season-meter__item {
  display: flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
}
.season-meter__chip {
  display: block;
  width: 14px;
  height: 4px;
  border-radius: 1px;
  background: currentColor;
}
.season-meter__txt { color: #8C8272; }
.season-meter__item--spring { color: var(--spring); }
.season-meter__item--summer { color: var(--summer); }
.season-meter__item--autumn { color: var(--autumn); }
.season-meter__item--winter { color: var(--winter); }

.brand-rail__motto {
  margin: auto 0 0;
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: #7E7566;
  text-align: center;
}

.rail-progress {
  position: absolute;
  top: 0;
  right: 0;
  width: 3px;
  height: 100%;
  background: rgba(201, 191, 169, 0.14);
  pointer-events: none;
}
.rail-progress::after {
  content: "";
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    180deg,
    var(--spring) 0%,
    var(--summer) 38%,
    var(--autumn) 68%,
    var(--winter) 100%
  );
  transform: scaleY(var(--sp, 0));
  transform-origin: top;
}

/* 顶栏 */
.site-header__bar {
  position: fixed;
  top: 0;
  left: var(--rail-w);
  right: 0;
  height: var(--bar-h);
  z-index: 55;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  padding-inline: clamp(18px, 3.5vw, 56px);
  background: rgba(243, 237, 224, 0.95);
  border-bottom: 1px solid var(--rule);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 10px 12px;
  color: var(--ink);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-decoration: none;
  border-radius: var(--radius);
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease);
}
.site-nav__num {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--muted);
}
.site-nav__label { white-space: nowrap; }

.site-nav__link:hover { background: var(--paper-2); }

.site-nav__link[aria-current="page"] { color: var(--accent); }
.site-nav__link[aria-current="page"] .site-nav__num { color: var(--accent); }
.site-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 3px;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
}

.site-header__utils {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-left: 22px;
  padding-left: 22px;
  border-left: 1px solid var(--rule);
}
.u-link {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.u-link:hover { color: var(--ink); border-bottom-color: var(--rule); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 13px;
  background: transparent;
  border: 1px solid var(--rule);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ink);
  cursor: pointer;
}
.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 18px;
}
.nav-toggle__bars i {
  display: block;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
  transition: transform 0.2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:first-child {
  transform: translateY(3px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:last-child {
  transform: translateY(-3px) rotate(-45deg);
}

/* ---------- 页脚档案条 ---------- */
.site-footer {
  margin-top: clamp(56px, 8vw, 110px);
  background: var(--panel);
  color: #C6BEAE;
  border-top: 3px solid var(--accent);
}

.footer-archive {
  display: grid;
  grid-template-columns: minmax(200px, 1.15fr) minmax(180px, 0.85fr) minmax(250px, 1.25fr);
  gap: clamp(24px, 3vw, 52px);
  width: min(100%, var(--wrap));
  margin-inline: auto;
  padding: clamp(34px, 4vw, 58px) clamp(18px, 3.5vw, 56px) clamp(28px, 3vw, 44px);
}

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

.footer-brand {
  margin: 0 0 6px;
  font-size: 23px;
  font-weight: 800;
  letter-spacing: 0.14em;
  color: var(--paper);
}
.footer-domain {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: #7E7566;
}
.footer-note {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.85;
  color: #9A9182;
}

.footer-heading {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--fluoro);
}

.footer-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px 18px;
}
.footer-list a {
  display: inline-block;
  padding: 5px 0;
  font-size: 14px;
  color: #C6BEAE;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.footer-list a:hover { color: var(--paper); border-bottom-color: rgba(201, 191, 169, 0.4); }

.footer-contact {
  list-style: none;
  margin: 0;
  padding: 0;
}
.footer-contact li {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 10px;
  margin-bottom: 9px;
  font-size: 13.5px;
  line-height: 1.7;
  overflow-wrap: anywhere;
}
.footer-contact__key {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: #7E7566;
  padding-top: 3px;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 26px;
  justify-content: space-between;
  width: min(100%, var(--wrap));
  margin-inline: auto;
  padding: 16px clamp(18px, 3.5vw, 56px) 22px;
  border-top: 1px solid rgba(201, 191, 169, 0.2);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: #7E7566;
}
.footer-legal p { margin: 0; }

/* ---------- 通用版式 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: clamp(18px, 3.5vw, 56px);
}

.section { padding-block: clamp(38px, 5vw, 72px); }

.sec-head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px 16px;
  padding-bottom: 14px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--rule);
}
.sec-num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 42px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--accent);
}
.sec-title {
  margin: 0;
  font-size: clamp(20px, 2.4vw, 30px);
  font-weight: 800;
}
.sec-note {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  font-family: var(--font-sans);
  font-size: 14.5px;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.2;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease),
    border-color 0.2s var(--ease), transform 0.2s var(--ease);
}
.btn:hover { transform: translateY(-1px); }
.btn--solid { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.btn--solid:hover { background: #2C2620; border-color: #2C2620; }
.btn--accent { background: var(--accent); border-color: var(--accent); color: #FFF6EF; }
.btn--accent:hover { background: #BF3820; border-color: #BF3820; }
.btn--ghost { border-color: var(--rule); color: var(--ink); background: transparent; }
.btn--ghost:hover { background: var(--paper-2); }
.btn--onpanel { border-color: rgba(201, 191, 169, 0.34); color: var(--paper); }
.btn--onpanel:hover { background: rgba(184, 240, 60, 0.12); border-color: var(--fluoro); }

/* ---------- 面包屑 ---------- */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
}
.crumbs a { color: var(--muted); text-decoration: none; border-bottom: 1px solid var(--rule); }
.crumbs a:hover { color: var(--ink); }
.crumbs__sep { color: var(--rule); }
.crumbs [aria-current="page"] { color: var(--ink); }

/* ---------- 纸卡 / 数据面板 / 标签 / 指标 ---------- */
.paper-card {
  padding: clamp(18px, 2.2vw, 28px);
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  box-shadow: 0 6px 0 -2px var(--paper-2), 0 8px 16px rgba(30, 26, 22, 0.06);
}

.panel {
  padding: clamp(20px, 2.6vw, 32px);
  background: var(--panel);
  color: #D8D2C4;
  border-radius: var(--radius);
  border-left: 3px solid var(--fluoro);
}
.panel h1, .panel h2, .panel h3, .panel h4 { color: var(--paper); }
.panel a { color: var(--fluoro); }
.panel__label {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--fluoro);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--muted);
  border: 1px solid var(--rule);
  border-radius: 999px;
}
.tag--spring { background: var(--spring); border-color: var(--spring); color: #F1F6EE; }
.tag--summer { background: var(--summer); border-color: var(--summer); color: #201509; }
.tag--autumn { background: var(--autumn); border-color: var(--autumn); color: #201509; }
.tag--winter { background: var(--winter); border-color: var(--winter); color: #F0F4FA; }
.tag--accent { background: var(--accent); border-color: var(--accent); color: #FFF6EF; }

.metric { display: flex; flex-direction: column; gap: 4px; }
.metric__value {
  font-family: var(--font-mono);
  font-size: clamp(34px, 6vw, 64px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.04em;
  font-variant-numeric: tabular-nums;
}
.metric__unit {
  margin-left: 5px;
  font-size: 0.32em;
  font-weight: 600;
  letter-spacing: 0;
  color: var(--muted);
}
.metric__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}
.panel .metric__value { color: var(--fluoro); }
.panel .metric__unit,
.panel .metric__label { color: #8E8676; }

/* ---------- 图片容器 ---------- */
.figure-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
}
.figure-frame > img,
.figure-frame > video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.figure-frame--wide { aspect-ratio: 21 / 9; }
.figure-frame--tall { aspect-ratio: 4 / 3; }
.figure-frame--map { aspect-ratio: 3 / 2; }
.panel .figure-frame {
  background: #1C1F24;
  border-color: rgba(201, 191, 169, 0.24);
}

/* ---------- 栅格 ---------- */
.grid {
  display: grid;
  gap: clamp(16px, 2vw, 28px);
}
.grid--7-5 { grid-template-columns: 7fr 5fr; }
.grid--8-4 { grid-template-columns: 8fr 4fr; }
.grid--auto { grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); }

/* ---------- 滚动显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
[data-reveal].is-in { opacity: 1; transform: none; }

/* ---------- 平板 ---------- */
@media (max-width: 1080px) {
  :root { --rail-w: 86px; --bar-h: 58px; }

  .brand-rail__mark { font-size: 18px; letter-spacing: 0.2em; padding: 12px 5px; }
  .site-nav__link { font-size: 13.5px; padding: 10px 9px; gap: 5px; }
  .site-header__utils { margin-left: 12px; padding-left: 12px; gap: 12px; }
  .u-link { font-size: 11px; }
  .footer-archive { grid-template-columns: 1fr 1fr; }
  .footer-col--contact { grid-column: 1 / -1; }
}

/* ---------- 手机 ---------- */
@media (max-width: 760px) {
  html { scroll-padding-top: 118px; }

  body { padding-left: 0; padding-top: 0; }
  #main-content { scroll-margin-top: 118px; }
  .skip-link { left: 12px; }

  .site-header {
    position: sticky;
    top: 0;
    z-index: 70;
    box-shadow: 0 10px 24px -20px rgba(30, 26, 22, 0.7);
  }

  .brand-rail {
    position: relative;
    inset: auto;
    width: 100%;
    height: auto;
    flex-direction: row;
    align-items: center;
    gap: 12px;
    padding: 11px 18px;
    border-right: 0;
    border-bottom: 1px solid rgba(201, 191, 169, 0.2);
    overflow: visible;
  }
  .brand-rail__mark {
    writing-mode: horizontal-tb;
    text-orientation: mixed;
    padding: 0 0 0 10px;
    font-size: 19px;
    letter-spacing: 0.14em;
    border-top: 0;
    border-bottom: 0;
    border-left: 3px solid var(--accent);
  }
  .brand-rail__domain { display: none; }
  .season-meter { display: none; }
  .brand-rail__motto {
    margin: 0 0 0 auto;
    writing-mode: horizontal-tb;
    font-size: 10px;
    letter-spacing: 0.12em;
    text-align: right;
  }

  .rail-progress {
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;
    width: auto;
    height: 3px;
  }
  .rail-progress::after {
    transform: scaleX(var(--sp, 0));
    transform-origin: left;
  }

  .site-header__bar {
    position: static;
    height: auto;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 0;
    padding-inline: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--rule);
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
  }

  .site-header__utils {
    order: 1;
    margin-left: auto;
    padding: 10px 0 10px 18px;
    border-left: 0;
    gap: 14px;
  }
  .u-link { font-size: 12px; }

  .nav-toggle { order: 2; display: inline-flex; margin: 8px 18px 8px 14px; }

  .site-nav {
    order: 3;
    flex: 1 0 100%;
    width: 100%;
    display: none;
    background: var(--paper);
    border-top: 1px solid var(--rule);
    box-shadow: 0 16px 22px -18px rgba(30, 26, 22, 0.5);
  }
  .site-nav[data-open] { display: block; }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px 0 10px;
  }
  .site-nav__link {
    justify-content: flex-start;
    width: 100%;
    padding: 13px 18px;
    font-size: 16px;
    border-bottom: 1px solid var(--rule);
    border-radius: 0;
  }
  .site-nav__link:last-child { border-bottom: 0; }
  .site-nav__link:hover { background: var(--paper-2); }
  .site-nav__link[aria-current="page"]::after {
    left: 0;
    right: auto;
    top: 10px;
    bottom: 10px;
    width: 3px;
    height: auto;
    background: var(--accent);
  }

  .footer-list { grid-template-columns: 1fr; }
  .grid--7-5, .grid--8-4 { grid-template-columns: 1fr; }
  .sec-note { margin-left: 0; }
}

@media (max-width: 560px) {
  .footer-archive { grid-template-columns: 1fr; }
  .footer-brand { font-size: 20px; }
  .footer-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* 矮视口保护：轨道注释不挤压 */
@media (max-height: 620px) {
  .brand-rail__motto { display: none; }
}

/* ---------- 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;
  }

  [data-reveal] { opacity: 1 !important; transform: none !important; }
  .skip-link { transition: none; }
}