/* ==========================================================================
   天行体育 · 共享外壳样式（/assets/site.css）
   骨架：深墨绿基座 + 1px 精密网格 + 框架式导航 + 荧光青状态标记
   ========================================================================== */

/* ---------- 1. 设计变量 ---------- */
:root {
  /* 色彩 */
  --ink:            #0B1F1A;
  --panel:          #0F2E27;
  --panel-deep:     #164136;
  --cyan:           #5CF2C8;
  --cyan-soft:      #A8FFE4;
  --cyan-deep:      #0E7A63;
  --orange:         #FF7A2F;
  --silver:         #C7D0CC;
  --paper:          #F2F7F5;
  --paper-ink:      #13211D;
  --line:           #3A5A52;
  --line-soft:      rgba(58, 90, 82, .55);

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

  /* 尺寸 */
  --header-h: 72px;
  --shell-max: 1520px;
  --shell-pad: clamp(14px, 2.6vw, 36px);
  --radius: 0px;

  /* 动效 */
  --t-fast: 140ms linear;
  --t-base: 180ms linear;
}

/* ---------- 2. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background-color: var(--ink);
  color: var(--silver);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

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

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

a { color: var(--cyan); text-decoration: none; }
a:hover { color: var(--cyan-soft); }

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

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

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

:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: 2px;
}

[id] { scroll-margin-top: calc(var(--header-h) + 24px); }

/* ---------- 3. 中文排版层级 ---------- */
h1, h2, h3, h4 {
  color: var(--paper);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.14;
}

h1 { font-size: clamp(34px, 5vw, 60px); }
h2 { font-size: clamp(24px, 3vw, 38px); }
h3 { font-size: clamp(18px, 1.8vw, 23px); }
h4 { font-size: 17px; letter-spacing: 0; }

p { max-width: 720px; }

.display-1 {
  font-size: clamp(44px, 7vw, 96px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--paper);
}

.display-2 {
  font-size: clamp(28px, 4vw, 52px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--paper);
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.annotation {
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.5;
  letter-spacing: 0.16em;
  color: var(--silver);
  text-transform: uppercase;
}

.annotation--v {
  writing-mode: vertical-rl;
  transform: rotate(180deg);
}

.dim {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--silver);
  opacity: 0.78;
}

/* ---------- 4. 布局骨架 ---------- */
.container {
  width: 100%;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding-left: var(--shell-pad);
  padding-right: var(--shell-pad);
}

.prose { max-width: 700px; }
.prose p { max-width: 100%; }
.prose p + p { margin-top: 1.05em; }
.prose h2 { margin-top: 2em; margin-bottom: 0.55em; }
.prose h3 { margin-top: 1.7em; margin-bottom: 0.5em; }
.prose ul, .prose ol { margin: 1em 0; padding-left: 1.2em; list-style: disc; }
.prose li + li { margin-top: 0.4em; }

/* 1px 缝隙拼接的 Bento 网格 */
.grid {
  display: grid;
  gap: 1px;
  background-color: var(--line);
  border: 1px solid var(--line);
}

.grid > * { background-color: var(--ink); }

.cell {
  background-color: var(--panel);
  border: 1px solid var(--line);
  padding: clamp(16px, 2vw, 28px);
  min-width: 0;
  position: relative;
}

.cell--deep { background-color: var(--panel-deep); }

/* 浅色反相分区：口径表格与法务长文 */
.invert {
  background-color: var(--paper);
  color: var(--paper-ink);
  border-color: var(--paper);
}
.invert h1, .invert h2, .invert h3, .invert h4 { color: var(--paper-ink); }
.invert .eyebrow { color: var(--cyan-deep); }
.invert .num { color: var(--cyan-deep); }
.invert .dim, .invert .annotation { color: #4A5C56; opacity: 1; }
.invert a { color: var(--cyan-deep); }
.invert a:hover { color: #06architecture; }
.invert a:hover { color: #065646; }

/* ---------- 5. 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.2;
  color: var(--cyan);
  background-color: transparent;
  border: 1px solid var(--cyan);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color var(--t-base), color var(--t-base), border-color var(--t-base);
}
.btn:hover { background-color: var(--cyan); color: var(--ink); }

.btn--solid { background-color: var(--cyan); color: var(--ink); }
.btn--solid:hover { background-color: transparent; color: var(--cyan); }

.btn--ghost { border-color: var(--line); color: var(--silver); }
.btn--ghost:hover { border-color: var(--cyan); color: var(--cyan); background-color: transparent; }

.btn--block { display: flex; width: 100%; justify-content: center; }

/* ---------- 6. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 20px 0 4px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
}
.breadcrumb li { display: flex; align-items: center; gap: 8px; }
.breadcrumb li + li::before { content: "/"; color: var(--line); }
.breadcrumb a {
  color: var(--silver);
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast);
}
.breadcrumb a:hover { color: var(--cyan); border-bottom-color: var(--cyan); }
.breadcrumb [aria-current="page"] { color: var(--cyan); }

/* ---------- 7. 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  background-color: var(--panel);
  border: 1px solid var(--line);
  overflow: hidden;
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(to right, rgba(58, 90, 82, .34) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(58, 90, 82, .34) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
}

.media-frame img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame__label {
  position: absolute;
  z-index: 2;
  left: 12px;
  bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  background-color: rgba(11, 31, 26, .78);
  padding: 4px 8px;
}

/* ---------- 8. 页头：框架式导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background-color: rgba(11, 31, 26, .97);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.skip-link {
  position: absolute;
  left: 10px;
  top: -60px;
  z-index: 400;
  padding: 10px 18px;
  background-color: var(--cyan);
  color: var(--ink);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  transition: top var(--t-fast);
}
.skip-link:focus { top: 8px; color: var(--ink); }

.header-inner {
  position: relative;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 0 var(--shell-pad);
  min-height: var(--header-h);
  display: grid;
  grid-template-columns: auto 1fr auto;
  grid-template-areas: "brand nav utility";
  align-items: center;
  column-gap: clamp(14px, 2.4vw, 44px);
  border-left: 1px solid var(--line);
  border-right: 1px solid var(--line);
}

/* 品牌 */
.brand-mark {
  grid-area: brand;
  display: flex;
  flex-direction: column;
  gap: 2px;
  text-decoration: none;
  white-space: nowrap;
}
.brand-name {
  font-size: clamp(17px, 1.4vw, 21px);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--paper);
}
.brand-descriptor {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  line-height: 1.2;
  color: var(--cyan);
}
.brand-mark:hover .brand-descriptor { color: var(--cyan-soft); }

/* 主导航：作为框架的一根竖柱 */
.primary-nav {
  grid-area: nav;
  display: flex;
  align-items: center;
  justify-content: center;
  align-self: stretch;
  padding: 0 clamp(6px, 1.4vw, 22px);
  border-left: 1px solid var(--line-soft);
  border-right: 1px solid var(--line-soft);
}

.nav-list {
  display: flex;
  align-items: stretch;
  gap: clamp(2px, 1.4vw, 24px);
}

.nav-list a {
  position: relative;
  display: block;
  padding: 10px 2px;
  font-size: 14px;
  letter-spacing: 0.03em;
  line-height: 1.4;
  color: var(--silver);
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast);
}
.nav-list a:hover { color: var(--cyan-soft); }

.nav-list a[aria-current="page"] {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* 右侧工具区 */
.utility-block {
  grid-area: utility;
  display: flex;
  align-items: center;
  gap: clamp(8px, 1.4vw, 20px);
}

.utility-link {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--silver);
  padding: 6px 0;
  border-bottom: 1px solid var(--line);
  transition: color var(--t-fast), border-color var(--t-fast);
}
.utility-link:hover { color: var(--cyan); border-bottom-color: var(--cyan); }

.cta-button {
  display: inline-block;
  padding: 9px 18px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.2;
  color: var(--ink);
  background-color: var(--cyan);
  border: 1px solid var(--cyan);
  white-space: nowrap;
  transition: background-color var(--t-base), color var(--t-base), border-color var(--t-base);
}
.cta-button:hover {
  background-color: transparent;
  color: var(--cyan-soft);
  border-color: var(--cyan-soft);
}

/* 移动端开关 */
.nav-toggle {
  grid-area: toggle;
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 12px;
  border: 1px solid var(--line);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  transition: border-color var(--t-fast), color var(--t-fast);
}
.nav-toggle:hover { border-color: var(--cyan); }
.nav-toggle-bars {
  display: block;
  width: 16px;
  height: 1px;
  background-color: currentColor;
  box-shadow: 0 -5px 0 currentColor, 0 5px 0 currentColor;
}
.nav-toggle-label { line-height: 1; }

/* 阅读进度：贴在页头下边缘 */
.read-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 0;
  height: 1px;
  background-color: var(--cyan);
  z-index: 3;
  pointer-events: none;
}

/* ---------- 9. 页脚 ---------- */
.site-footer {
  margin-top: clamp(56px, 9vw, 120px);
  background-color: var(--ink);
  border-top: 1px solid var(--line);
}

.footer-inner {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: clamp(36px, 5vw, 72px) var(--shell-pad) 0;
  border-left: 1px solid var(--line);
  border-right: 1px solid var(--line);
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(260px, 1.6fr) repeat(3, minmax(120px, 0.7fr));
  gap: clamp(24px, 4vw, 64px);
  padding-bottom: clamp(32px, 4vw, 56px);
}

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

.footer-brand {
  font-size: clamp(22px, 2.2vw, 30px);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--paper);
}

.footer-kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.footer-summary {
  margin-top: 4px;
  max-width: 44ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--silver);
}

.footer-col-title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.2em;
  color: var(--cyan);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.footer-links li + li { margin-top: 10px; }

.footer-links a {
  font-size: 14px;
  color: var(--silver);
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast);
}
.footer-links a:hover { color: var(--cyan-soft); border-bottom-color: var(--cyan-soft); }

.footer-contact {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: clamp(16px, 2.4vw, 36px);
  padding: clamp(24px, 3vw, 40px) 0;
  border-top: 1px solid var(--line);
}

.contact-item { display: flex; flex-direction: column; gap: 6px; min-width: 0; }

.contact-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.contact-value {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--silver);
  word-break: break-word;
}

.contact-note {
  grid-column: 1 / -1;
  max-width: 620px;
  font-size: 12.5px;
  line-height: 1.8;
  color: var(--silver);
  opacity: 0.76;
  padding-top: 6px;
  border-top: 1px dashed var(--line-soft);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 28px;
  padding: 18px 0 26px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--silver);
}
.footer-channel a { color: var(--silver); border-bottom: 1px solid var(--line); }
.footer-channel a:hover { color: var(--cyan); border-bottom-color: var(--cyan); }
.footer-icp { color: var(--cyan); }

/* ---------- 10. 显现与章节态 ---------- */
:root.js [data-section] {
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 240ms linear, transform 240ms linear;
}
:root.js [data-section][data-inview="true"] {
  opacity: 1;
  transform: none;
}

[data-section-link][aria-current="true"] {
  color: var(--cyan);
  border-left: 3px solid var(--cyan);
}

/* ---------- 11. 响应式 ---------- */
@media (max-width: 1180px) {
  .header-inner { column-gap: clamp(10px, 1.6vw, 22px); }
  .nav-list a { font-size: 13px; }
  .utility-link { display: none; }
}

@media (max-width: 1040px) {
  .header-inner {
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "brand   toggle"
      "nav     nav"
      "utility utility";
    align-items: center;
    column-gap: 16px;
    padding-top: 14px;
    padding-bottom: 14px;
  }

  .brand-mark { grid-area: brand; }
  .nav-toggle { grid-area: toggle; display: inline-flex; }

  .primary-nav {
    display: none;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    align-self: auto;
    padding: 16px 0 0;
    border-left: 0;
    border-right: 0;
  }

  .utility-block {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    padding: 16px 0 4px;
  }

  .site-header[data-open] .primary-nav,
  .site-header[data-open] .utility-block { display: flex; }

  .nav-list { flex-direction: column; gap: 0; }
  .nav-list li { border-top: 1px solid var(--line-soft); }
  .nav-list a { padding: 14px 2px; font-size: 15px; border-bottom: 0; }
  .nav-list a[aria-current="page"] {
    border-bottom: 0;
    padding-left: 12px;
  }
  .nav-list a[aria-current="page"]::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 3px;
    height: 15px;
    transform: translateY(-50%);
    background-color: var(--cyan);
  }

  .utility-link {
    display: block;
    font-size: 13px;
    padding: 10px 2px;
    border-bottom: 1px solid var(--line-soft);
  }
  .cta-button { text-align: center; padding: 12px 18px; }

  .footer-top {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(20px, 4vw, 40px);
  }
  .footer-lead { grid-column: 1 / -1; }
}

@media (max-width: 720px) {
  :root { --header-h: 64px; }

  body { font-size: 15.5px; }

  .footer-contact { grid-template-columns: minmax(0, 1fr); }
  .footer-base {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}

@media (max-width: 560px) {
  .footer-top { grid-template-columns: minmax(0, 1fr); }
  .brand-descriptor { letter-spacing: 0.1em; }
}

/* ---------- 12. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  :root.js [data-section],
  :root.js [data-section][data-inview="true"] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .skip-link,
  .btn,
  .cta-button,
  .utility-link,
  .nav-list a,
  .nav-toggle,
  .footer-links a,
  .breadcrumb a {
    transition: none;
  }
}