/* ==========================================================================
   米兰赛场 · 共享样式 / assets/site.css
   展览画册式布局 · 双层导航 · 纸张叠层 · 赛场数据色盘
   ========================================================================== */

/* ---------- 1. 设计变量 ---------- */
:root {
  /* 色彩 */
  --rosso: #C8102E;
  --rosso-deep: #8C0B1F;
  --ink: #121317;
  --paper: #F7F5F1;
  --paper-2: #E7E1D6;
  --line: #CFD4DC;
  --muted: #6B7280;
  --lime: #C8FF3D;
  --cyan: #2EE6C5;
  --steel: #33415C;
  --mist: #B9C0CB;

  /* 字体 */
  --font-display: "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans SC", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Source Han Sans SC", "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  /* 字号阶梯：12 / 14 / 17 / 22 / 28 / 40 / 64 / 96 / 140 */
  --fs-12: 12px;
  --fs-14: 14px;
  --fs-17: 17px;
  --fs-22: 22px;
  --fs-28: 28px;
  --fs-40: 40px;
  --fs-64: 64px;
  --fs-96: 96px;
  --fs-140: 140px;

  /* 节奏 */
  --pad: clamp(16px, 4vw, 56px);
  --shell: 1440px;
  --gap: clamp(20px, 3vw, 40px);
  --hair: 1px;
}

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--fs-17);
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: -0.01em;
}

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

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

a { color: inherit; }

button { font: inherit; color: inherit; }

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

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

hr {
  border: 0;
  border-top: var(--hair) solid var(--line);
  margin: var(--gap) 0;
}

::selection { background: var(--rosso); color: var(--paper); }

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

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

/* ---------- 3. 壳体与网格 ---------- */
.wrap {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.layout-split {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
  gap: var(--gap);
  align-items: start;
}

.layout-split__rail { min-width: 0; }
.layout-split__main { min-width: 0; }

.prose { max-width: 42em; }
.prose p { margin: 0 0 1.2em; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--muted);
  text-transform: uppercase;
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--rosso);
}

/* ---------- 4. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: -120px;
  left: 16px;
  z-index: 200;
  padding: 12px 22px;
  background: var(--ink);
  color: var(--paper);
  font-size: var(--fs-14);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  border-left: 3px solid var(--lime);
  transition: top 0.18s ease;
}
.skip-link:focus { top: 12px; }

/* ---------- 5. 按钮与胶囊 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  padding: 12px 22px;
  border: var(--hair) solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: var(--fs-14);
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.2;
  text-decoration: none;
  border-radius: 0;
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}
.btn:hover { background: var(--rosso-deep); border-color: var(--rosso-deep); }

.btn--red { background: var(--rosso); border-color: var(--rosso); }
.btn--red:hover { background: var(--rosso-deep); border-color: var(--rosso-deep); }

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

.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border: var(--hair) solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--fs-12);
  font-weight: 500;
  letter-spacing: 0.1em;
  line-height: 1.4;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}
.pill:hover { border-color: var(--ink); }
.pill[aria-pressed="true"],
.pill[aria-current="true"] {
  background: var(--rosso);
  border-color: var(--rosso);
  color: var(--paper);
  font-weight: 700;
}

/* ---------- 6. 面包屑 ---------- */
.breadcrumb {
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--muted);
}
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.breadcrumb li { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumb li + li::before {
  content: "/";
  color: var(--line);
  font-family: var(--font-mono);
}
.breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: var(--hair) solid var(--line);
  padding-bottom: 1px;
  transition: color 0.18s ease, border-color 0.18s ease;
}
.breadcrumb a:hover { color: var(--rosso); border-bottom-color: var(--rosso); }

/* ---------- 7. 图片容器 ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background: var(--paper-2);
  border: var(--hair) solid var(--line);
}
.media-frame > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.media-frame:hover > img { transform: scale(1.03); }

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--4x3 { aspect-ratio: 4 / 3; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 3 / 4; }

.media-frame__tag {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 6px 14px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  line-height: 1.5;
}

/* ---------- 8. 页头 ---------- */
.site-header {
  position: relative;
  z-index: 60;
}

/* 8.1 上层：品牌说明 + 数据状态 */
.header-top {
  background: var(--ink);
  color: var(--paper);
}

.header-top__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px 40px;
  flex-wrap: wrap;
  padding-block: 18px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  color: inherit;
}

.brand__mark {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 42px;
  height: 42px;
  background: var(--rosso);
  color: var(--paper);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-22);
  line-height: 1;
  letter-spacing: 0;
}

.brand__text { display: block; }

.brand__name {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-17);
  line-height: 1.3;
  letter-spacing: 0.04em;
}

.brand__tagline {
  display: block;
  margin-top: 3px;
  font-size: var(--fs-12);
  line-height: 1.5;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.header-status {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 22px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.status-item {
  display: flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
}

.status-item__label {
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--mist);
}

.status-item__value {
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  font-weight: 600;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.status-item--version .status-item__value {
  padding: 2px 9px;
  background: var(--lime);
  color: var(--ink);
  font-weight: 700;
  animation: version-breathe 1.2s ease-out 1;
}

@keyframes version-breathe {
  0%   { box-shadow: 0 0 0 0 rgba(200, 255, 61, 0.75); }
  100% { box-shadow: 0 0 0 10px rgba(200, 255, 61, 0); }
}

/* 8.2 下层：吸顶栏目索引 */
.header-nav {
  position: sticky;
  top: 0;
  z-index: 70;
  background: var(--paper);
  border-bottom: var(--hair) solid var(--line);
}

.header-nav__inner {
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: 58px;
  padding-block: 6px;
  flex-wrap: wrap;
}

.nav-eyebrow {
  margin: 0;
  padding-right: 20px;
  border-right: var(--hair) solid var(--line);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--muted);
  white-space: nowrap;
}

.primary-nav { flex: 1 1 auto; min-width: 0; }

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

.primary-nav__item { display: block; }

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 10px 13px;
  color: var(--ink);
  font-size: var(--fs-14);
  font-weight: 500;
  letter-spacing: 0.04em;
  line-height: 1.4;
  text-decoration: none;
  transition: color 0.18s ease;
}

.nav-link__index {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0;
  color: var(--muted);
  transition: color 0.18s ease;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 13px;
  right: 13px;
  bottom: 0;
  height: 3px;
  background: var(--rosso);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.24s ease;
}

.nav-link:hover { color: var(--rosso); }
.nav-link:hover::after,
.nav-link:focus-visible::after { transform: scaleX(1); }

.nav-link[aria-current="page"] { color: var(--rosso); font-weight: 700; }
.nav-link[aria-current="page"]::after { transform: scaleX(1); }
.nav-link[aria-current="page"] .nav-link__index { color: var(--rosso); }

.nav-cta { flex: 0 0 auto; margin-left: auto; padding: 10px 18px; }

/* 8.3 移动菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  padding: 8px 14px;
  background: var(--paper-2);
  border: var(--hair) solid var(--ink);
  color: var(--ink);
  font-size: var(--fs-12);
  font-weight: 700;
  letter-spacing: 0.14em;
  line-height: 1.4;
  cursor: pointer;
}

.nav-toggle__label { display: block; }

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  background: currentColor;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: currentColor;
}
.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }

/* 8.4 阅读进度条 */
.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 2px;
  background: var(--rosso);
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}

/* ---------- 9. 页脚 ---------- */
.site-footer {
  margin-top: clamp(64px, 9vw, 120px);
  background: var(--ink);
  color: var(--paper);
}

.footer-inner { padding-block: clamp(44px, 6vw, 68px) 40px; }

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.4fr;
  gap: 40px 32px;
  align-items: start;
}

.footer-brand__mark {
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  background: var(--rosso);
  color: var(--paper);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-22);
  line-height: 1;
}

.footer-brand__name {
  margin: 16px 0 6px;
  font-family: var(--font-display);
  font-size: var(--fs-17);
  font-weight: 700;
  letter-spacing: 0.06em;
}

.footer-brand__desc {
  margin: 0;
  max-width: 26em;
  font-size: var(--fs-12);
  line-height: 1.9;
  letter-spacing: 0.1em;
  color: var(--mist);
}

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

.footer-heading {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--mist);
  text-transform: uppercase;
}

.footer-list {
  display: grid;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: var(--fs-14);
  line-height: 1.6;
}

.footer-list a {
  color: var(--paper);
  text-decoration: none;
  border-bottom: var(--hair) solid transparent;
  padding-bottom: 1px;
  transition: color 0.18s ease, border-color 0.18s ease;
}
.footer-list a:hover {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.footer-list--plain li {
  color: #C7CCD5;
  letter-spacing: 0.02em;
  word-break: break-word;
}

.footer-meta {
  display: grid;
  gap: 8px;
  margin-top: clamp(32px, 5vw, 52px);
  padding-top: 22px;
  border-top: var(--hair) solid rgba(207, 212, 220, 0.22);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--mist);
}

.footer-legal {
  margin: 0;
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}
.footer-note { margin: 0; }
.footer-copy { margin: 0; }

/* ---------- 10. 返回顶部 ---------- */
.to-top {
  position: fixed;
  right: var(--pad);
  bottom: 24px;
  z-index: 90;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  padding: 0;
  border: var(--hair) solid var(--line);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: var(--fs-17);
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.24s ease, transform 0.24s ease, visibility 0.24s ease, background-color 0.18s ease, color 0.18s ease;
}
.to-top[data-visible="true"] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.to-top:hover { background: var(--rosso); border-color: var(--rosso); color: var(--paper); }

/* ---------- 11. 滚动显现 ---------- */
[data-reveal] {
  opacity: 1;
  transform: none;
  transition: opacity 0.32s ease, transform 0.32s cubic-bezier(0.22, 0.7, 0.3, 1);
}
[data-reveal].is-pending {
  opacity: 0;
  transform: translateY(12px);
}

/* ---------- 12. 响应式 ---------- */
@media (max-width: 1100px) {
  .nav-eyebrow { display: none; }
  .nav-cta { display: none; }
}

@media (max-width: 960px) {
  .layout-split { grid-template-columns: minmax(0, 1fr); }
  .header-top__inner { flex-direction: column; align-items: flex-start; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 860px) {
  .header-nav__inner {
    gap: 10px;
    padding-block: 10px;
    min-height: 0;
  }

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

  .primary-nav { flex: 1 1 100%; }

  .primary-nav__list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-top: 4px;
  }

  .primary-nav[data-open] .primary-nav__list { display: flex; }

  .primary-nav__item { width: 100%; }

  .nav-link {
    display: flex;
    width: 100%;
    padding: 13px 0 13px 14px;
    border-top: var(--hair) solid var(--line);
    font-size: var(--fs-17);
  }

  .nav-link::after {
    left: 0;
    right: auto;
    top: 12px;
    bottom: 12px;
    width: 3px;
    height: auto;
    transform: scaleY(0);
    transform-origin: top center;
  }
  .nav-link:hover::after,
  .nav-link:focus-visible::after,
  .nav-link[aria-current="page"]::after { transform: scaleY(1); }

  .header-status { gap: 8px 16px; }
  .status-item__value { font-size: var(--fs-12); }
}

@media (max-width: 640px) {
  body { font-size: var(--fs-17); }
  .brand__tagline { letter-spacing: 0.06em; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .to-top { right: 16px; bottom: 16px; width: 42px; height: 42px; }
}

/* ---------- 13. 减少动态效果 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0ms !important;
  }

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

  .status-item--version .status-item__value { animation: none; }
  .media-frame:hover > img { transform: none; }
  .to-top { transform: none; }
}