/* =========================================================================
   云开赛事 · 全站共享样式 /assets/site.css
   设计语言：展览画册式留白 · 破晓青蓝近单色体系 · 粗野主义骨架
   ========================================================================= */

/* ---------- 1. 设计令牌 ---------- */
:root {
  --c-dawn: #1B7FA8;
  --c-mid: #4FA3C7;
  --c-mist: #EAF4F9;
  --c-cloud: #FFFFFF;
  --c-ink: #0E2233;
  --c-ember: #FF7A3D;
  --c-ember-soft: #FFD9C2;
  --c-line: #10202C;
  --c-mute: #6B8291;
  --c-num: #0B4C66;
  --c-text: #23343F;

  --font-display: "HarmonyOS Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "HarmonyOS Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  --edge: 2px solid var(--c-line);
  --lift: 6px 6px 0 var(--c-line);
  --lift-sm: 3px 3px 0 var(--c-line);
  --page: 1280px;
  --gutter: clamp(18px, 4vw, 40px);
  --rhythm: clamp(64px, 9vw, 120px);
  --ease: cubic-bezier(.2, .7, .3, 1);
}

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

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

body {
  margin: 0;
  padding-top: 6px;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  color: var(--c-text);
  background: var(--c-cloud);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
img, svg, video, canvas { display: block; max-width: 100%; height: auto; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; padding: 0; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }
strong { font-weight: 700; }

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

/* ---------- 3. 中文排版基调 ---------- */
h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.16;
  color: var(--c-ink);
}
h1 { font-size: clamp(2.5rem, 6vw, 4rem); }
h2 { font-size: clamp(1.6rem, 3.4vw, 2.5rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.45rem); }
p { max-width: 72ch; }
p + p { margin-top: .55em; }

/* ---------- 4. 无障碍辅助 ---------- */
.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;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 12px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--c-ink);
  color: #FFFFFF;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  border: var(--edge);
  transform: translateY(-200%);
  transition: transform .24s var(--ease);
}
.skip-link:focus { transform: translateY(0); }

/* ---------- 5. 破晓光带 ---------- */
.dawn-line {
  height: 6px;
  background: linear-gradient(90deg, var(--c-dawn) 0%, #A9D8E8 52%, var(--c-ember) 100%);
}
.dawn-line--top {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 120;
  transform-origin: left center;
  animation: dawn-open .48s var(--ease) both;
}
@keyframes dawn-open {
  from { transform: scaleX(0); opacity: .4; }
  to { transform: scaleX(1); opacity: 1; }
}

/* ---------- 6. 吸顶刊头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--c-cloud);
  border-bottom: 2px solid var(--c-line);
  transition: box-shadow .3s var(--ease);
}
.site-header[data-shrunk="true"] {
  box-shadow: 0 8px 0 rgba(16, 32, 44, .07);
}

.header-inner {
  max-width: var(--page);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.masthead {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
  padding: clamp(16px, 2.2vw, 26px) 0 clamp(10px, 1.4vw, 16px);
  transition: padding .34s var(--ease);
}
.site-header[data-shrunk="true"] .masthead { padding: 9px 0 8px; }

.masthead-note {
  max-width: 22ch;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .08em;
  color: var(--c-mute);
  font-variant-numeric: tabular-nums;
}

.brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 2px 10px;
  text-align: center;
  justify-self: center;
}
.brand-word {
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 3vw, 2.05rem);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.1;
  color: var(--c-ink);
}
.brand-tag {
  max-height: 22px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--c-mute);
  transition: opacity .3s var(--ease), max-height .3s var(--ease);
}
.site-header[data-shrunk="true"] .brand-tag {
  opacity: 0;
  max-height: 0;
  overflow: hidden;
}

.header-tools {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: clamp(8px, 1.2vw, 14px);
  justify-self: end;
}

.tool-chip {
  padding: 5px 10px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-mute);
  border: 1px solid rgba(16, 32, 44, .22);
  white-space: nowrap;
}

/* ---------- 7. 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  font-family: var(--font-display);
  font-size: .92rem;
  font-weight: 700;
  letter-spacing: .04em;
  line-height: 1.2;
  color: var(--c-ink);
  background: var(--c-cloud);
  border: 2px solid var(--c-line);
  box-shadow: var(--lift-sm);
  transition: transform .18s var(--ease), box-shadow .18s var(--ease),
              background-color .18s var(--ease), color .18s var(--ease);
}
.btn:hover {
  transform: translate(1px, 1px);
  box-shadow: 2px 2px 0 var(--c-line);
}
.btn:active {
  transform: translate(3px, 3px);
  box-shadow: 0 0 0 var(--c-line);
}
.btn--primary {
  background: var(--c-dawn);
  color: #FFFFFF;
}
.btn--primary:hover { background: var(--c-ink); }
.btn--ghost { background: transparent; }
.btn--block { width: 100%; }

/* ---------- 8. 移动菜单按钮 ---------- */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--c-ink);
  background: var(--c-cloud);
  border: 2px solid var(--c-line);
  box-shadow: var(--lift-sm);
}
.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: var(--c-ink);
  transition: background-color .2s var(--ease);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--c-ink);
  transition: transform .24s var(--ease), top .24s var(--ease);
}
.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { top: 0; transform: rotate(-45deg); }
.nav-toggle__text { white-space: nowrap; }

/* ---------- 9. 主导航 ---------- */
.site-nav { padding-bottom: clamp(8px, 1.2vw, 14px); }

.nav-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: clamp(6px, 2.4vw, 34px);
  padding-top: 6px;
  border-top: 1px solid rgba(16, 32, 44, .12);
}
.nav-list__item { display: block; }
.nav-list__link {
  position: relative;
  display: block;
  padding: 9px 2px 8px;
  font-size: .95rem;
  font-weight: 600;
  letter-spacing: .03em;
  color: #35485A;
  transition: color .18s var(--ease);
}
.nav-list__link::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  background: var(--c-ember);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform .24s var(--ease);
}
.nav-list__link:hover { color: var(--c-ink); }
.nav-list__link:hover::after { transform: scaleX(1); }
.nav-list__link[aria-current="page"] { color: var(--c-ink); }
.nav-list__link[aria-current="page"]::after { transform: scaleX(1); }

/* ---------- 10. 滚动进度 ---------- */
.scroll-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 3;
  width: 100%;
  height: 3px;
  background: var(--c-ember);
  transform: scaleX(0);
  transform-origin: left center;
}

/* ---------- 11. 页脚 ---------- */
.site-footer {
  margin-top: var(--rhythm);
  background: var(--c-ink);
  color: #C7DCE8;
}

.footer-inner {
  max-width: var(--page);
  margin: 0 auto;
  padding: clamp(48px, 7vw, 88px) var(--gutter) clamp(32px, 4vw, 48px);
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) repeat(2, minmax(0, 1fr));
  gap: clamp(28px, 4vw, 56px);
}
.footer-brand { min-width: 0; }
.footer-mark {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 2.4vw, 1.8rem);
  font-weight: 800;
  letter-spacing: -.02em;
  color: #FFFFFF;
}
.footer-tagline {
  margin-top: 8px;
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--c-mid);
}
.footer-note {
  margin-top: 18px;
  max-width: 34ch;
  font-size: 13px;
  line-height: 1.85;
  color: #8FAEC0;
}
.footer-col { min-width: 0; }
.footer-col__title {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--c-mid);
}
.footer-links {
  margin-top: 18px;
  display: grid;
  gap: 10px;
}
.footer-links__link {
  display: inline-block;
  font-size: 15px;
  color: #C7DCE8;
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}
.footer-links__link:hover {
  color: #FFFFFF;
  border-bottom-color: var(--c-ember);
}
.footer-meta { border-top: 1px solid rgba(199, 220, 232, .18); }
.footer-meta__inner {
  max-width: var(--page);
  margin: 0 auto;
  padding: 24px var(--gutter) 34px;
  display: grid;
  gap: 6px;
}
.footer-line {
  font-size: 13px;
  line-height: 1.9;
  color: #8FAEC0;
}
.footer-legal {
  font-size: 12px;
  letter-spacing: .06em;
  color: #6F8FA3;
}

/* ---------- 12. 章节与容器 ---------- */
.container {
  width: 100%;
  max-width: var(--page);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section { padding: var(--rhythm) 0; }
.section--tight { padding: clamp(40px, 5.5vw, 72px) 0; }
.section--mist { background: var(--c-mist); }
.section--ink {
  background: var(--c-ink);
  color: #C7DCE8;
}
.section--ink h2,
.section--ink h3,
.section--ink .section__title { color: #FFFFFF; }
.section--ink .section__num { color: var(--c-mid); }
.section--ink .section__sub { color: #8FAEC0; }

.section__head {
  display: grid;
  gap: 10px;
  max-width: 62ch;
  margin-bottom: clamp(28px, 4vw, 56px);
}
.section__num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--c-dawn);
}
.section__title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.4vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.18;
  color: var(--c-ink);
}
.section__sub {
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-mute);
}

/* ---------- 13. 网格 ---------- */
.grid {
  display: grid;
  gap: clamp(18px, 2.6vw, 34px);
}
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--aside {
  grid-template-columns: 280px minmax(0, 1fr);
  align-items: start;
}

/* ---------- 14. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  padding: 22px 0 4px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-mute);
}
.breadcrumb__item {
  display: inline-flex;
  align-items: center;
}
.breadcrumb__item:not(:first-child)::before {
  content: "/";
  margin: 0 8px;
  color: rgba(16, 32, 44, .3);
}
.breadcrumb__item a:hover { color: var(--c-dawn); }

/* ---------- 15. 图片容器 ---------- */
.figure-frame {
  display: block;
  background: var(--c-mist);
  border: var(--edge);
  box-shadow: var(--lift);
  overflow: hidden;
}
.figure-frame__media {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  background:
    linear-gradient(135deg, rgba(27, 127, 168, .95) 0%, rgba(169, 216, 232, .6) 52%, rgba(255, 122, 61, .8) 100%);
}
.figure-frame__media > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.figure-frame__caption {
  display: block;
  padding: 12px 16px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--c-mute);
  background: var(--c-cloud);
  border-top: 1px solid rgba(16, 32, 44, .14);
}
.figure-frame--wide .figure-frame__media { aspect-ratio: 21 / 9; }
.figure-frame--tall .figure-frame__media { aspect-ratio: 3 / 4; }

/* ---------- 16. 标签与数字 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--c-num);
  background: var(--c-mist);
  border: 1px solid rgba(16, 32, 44, .16);
}
.tag--ember {
  color: #8A3410;
  background: var(--c-ember-soft);
  border-color: rgba(255, 122, 61, .45);
}
.num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -.01em;
  color: var(--c-num);
}

/* ---------- 17. 标签页 ---------- */
.tabs { display: block; }
.tabs__list {
  display: flex;
  flex-wrap: wrap;
  background: var(--c-cloud);
  border: var(--edge);
  box-shadow: var(--lift-sm);
}
.tabs__tab {
  flex: 1 1 auto;
  padding: 12px 18px;
  font-family: var(--font-display);
  font-size: .9rem;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--c-mute);
  border-right: 1px solid rgba(16, 32, 44, .16);
  transition: background-color .18s var(--ease), color .18s var(--ease);
}
.tabs__tab:last-child { border-right: 0; }
.tabs__tab:hover {
  color: var(--c-ink);
  background: var(--c-mist);
}
.tabs__tab[aria-selected="true"] {
  color: #FFFFFF;
  background: var(--c-ink);
}
.tabs__panel { padding: clamp(22px, 3vw, 36px) 0 0; }
.tabs__panel[hidden] { display: none; }

/* ---------- 18. 进入视口显现 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(12px);
}
.reveal.is-shown {
  opacity: 1;
  transform: none;
  transition: opacity .5s var(--ease), transform .5s var(--ease);
}

/* ---------- 19. 平板 ---------- */
@media (max-width: 980px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--aside { grid-template-columns: minmax(0, 1fr); }
  .footer-inner { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-brand { grid-column: 1 / -1; }
}

/* ---------- 20. 移动端刊头与导航 ---------- */
@media (max-width: 880px) {
  .masthead {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 10px;
    padding: 14px 0 12px;
  }
  .site-header[data-shrunk="true"] .masthead { padding: 10px 0 10px; }
  .masthead-note { display: none; }
  .brand {
    align-items: flex-start;
    justify-self: start;
    padding: 0;
    text-align: left;
  }
  .brand-tag { letter-spacing: .1em; }
  .site-header[data-shrunk="true"] .brand-tag { opacity: 1; max-height: 22px; }
  .tool-chip { display: none; }
  .header-tools .btn--primary { display: none; }
  .nav-toggle { display: inline-flex; }

  .site-nav {
    display: none;
    padding-bottom: 0;
  }
  .site-nav[data-open="true"] {
    display: block;
    animation: nav-in .24s var(--ease) both;
  }
  .nav-list {
    flex-direction: column;
    gap: 0;
    padding-top: 0;
    border-top: 1px solid rgba(16, 32, 44, .16);
  }
  .nav-list__item { border-bottom: 1px solid rgba(16, 32, 44, .1); }
  .nav-list__link {
    padding: 15px 4px 15px 12px;
    font-size: 1.02rem;
    border-left: 3px solid transparent;
  }
  .nav-list__link::after { display: none; }
  .nav-list__link:hover::after { transform: none; }
  .nav-list__link[aria-current="page"] {
    color: var(--c-dawn);
    border-left-color: var(--c-ember);
  }
}
@keyframes nav-in {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 21. 小屏 ---------- */
@media (max-width: 640px) {
  body { font-size: 16px; }
  .grid--2,
  .grid--3 { grid-template-columns: minmax(0, 1fr); }
  .footer-inner { grid-template-columns: minmax(0, 1fr); }
  .tabs__tab { flex: 1 1 100%; border-right: 0; border-bottom: 1px solid rgba(16, 32, 44, .16); }
  .tabs__tab:last-child { border-bottom: 0; }
  .figure-frame { box-shadow: var(--lift-sm); }
}

/* ---------- 22. 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .dawn-line--top { animation: none; transform: none; }
  .reveal,
  .reveal.is-shown {
    opacity: 1 !important;
    transform: none !important;
  }
  .btn:hover,
  .btn:active { transform: none; }
}