/* =========================================================
   M6赛场 — /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 侧边轨道头部 / 四段页脚 / 通用组件
   ========================================================= */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, h5, h6, p, ul, ol, figure, blockquote, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video, canvas { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }

/* ---------- 2. 变量 ---------- */
:root {
  --ink-0: #050B18;
  --ink-1: #0B1630;
  --ink-2: #12224A;
  --ink-3: #1E3566;
  --cyan: #00E5D0;
  --cyan-soft: #7FF6EA;
  --orange: #FF7A1A;
  --red: #E23A2E;
  --paper: #F4F6FA;
  --slate: #8C9AB5;

  --line: rgba(140, 154, 181, 0.20);
  --line-soft: rgba(140, 154, 181, 0.12);
  --line-cyan: rgba(0, 229, 208, 0.32);

  --rail-w: 268px;
  --shell: 1180px;

  --font-display: "Barlow Condensed", "Oswald", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Consolas, monospace;
  --font-serif: "Noto Serif SC", "Songti SC", Georgia, serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 3. 基础与中文排版 ---------- */
body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--ink-0);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0.015em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  background:
    radial-gradient(120% 78% at 6% -4%, rgba(0, 229, 208, 0.10), transparent 58%),
    radial-gradient(96% 70% at 102% 104%, rgba(255, 122, 26, 0.08), transparent 60%),
    linear-gradient(180deg, #050B18 0%, #040912 58%, #050B18 100%);
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.5;
  background-image:
    linear-gradient(rgba(140, 154, 181, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(140, 154, 181, 0.055) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(86% 62% at 46% 12%, #000 0%, transparent 88%);
  mask-image: radial-gradient(86% 62% at 46% 12%, #000 0%, transparent 88%);
}

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

p { line-height: 1.85; }
strong, b { font-weight: 700; color: var(--paper); }
h1, h2, h3, h4 { line-height: 1.25; letter-spacing: 0.005em; }

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

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

/* ---------- 4. 跳转链接 ---------- */
.skip-link {
  position: absolute;
  left: 14px;
  top: -72px;
  z-index: 200;
  padding: 11px 18px;
  background: var(--cyan);
  color: #04121A;
  font-weight: 700;
  font-size: 14px;
  border-radius: 2px;
  transition: top 0.2s var(--ease);
}
.skip-link:focus { top: 14px; }

/* ---------- 5. 侧边轨道头部 ---------- */
.site-rail {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: 80;
  display: flex;
  flex-direction: column;
  gap: 26px;
  width: var(--rail-w);
  padding: 26px 20px 22px;
  background: linear-gradient(180deg, rgba(11, 22, 48, 0.96) 0%, rgba(5, 11, 24, 0.985) 100%);
  border-right: 1px solid var(--line);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}

.rail__brand { min-width: 0; }

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand__mark {
  flex: 0 0 44px;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  background: var(--cyan);
  color: #04121A;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 800;
  letter-spacing: 0.02em;
  clip-path: polygon(0 0, 100% 0, 100% 74%, 76% 100%, 0 100%);
}

.brand__text { min-width: 0; }

.brand__name {
  display: block;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 800;
  letter-spacing: 0.08em;
  line-height: 1.1;
  color: var(--paper);
}

.brand__tag {
  display: block;
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan-soft);
  opacity: 0.85;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* 移动端触发按钮（桌面隐藏） */
.nav-toggle {
  display: none;
  position: relative;
  z-index: 3;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  border: 1px solid var(--line-cyan);
  border-radius: 2px;
  color: var(--cyan);
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.16em;
  transition: background-color 0.16s var(--ease), color 0.16s var(--ease);
}
.nav-toggle:hover { background: rgba(0, 229, 208, 0.12); }

.nav-toggle__bars { display: grid; gap: 4px; width: 18px; }
.nav-toggle__bars span { display: block; height: 2px; background: currentColor; }
.nav-toggle__bars span:nth-child(2) { width: 70%; }

.nav-toggle__label { line-height: 1; }

/* 导航本体 */
.site-nav {
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
  min-height: 0;
  gap: 16px;
}

.site-nav__caption {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--slate);
}

.nav-list { display: flex; flex-direction: column; gap: 1px; }

.nav-list__link {
  position: relative;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  align-items: baseline;
  gap: 10px;
  padding: 11px 12px 11px 10px;
  border-left: 2px solid transparent;
  color: var(--paper);
  transition: background-color 0.16s var(--ease), color 0.16s var(--ease), border-color 0.16s var(--ease);
}

.nav-list__link:hover {
  background: rgba(0, 229, 208, 0.08);
  border-left-color: rgba(0, 229, 208, 0.5);
  color: var(--cyan-soft);
}

.nav-list__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--slate);
  font-variant-numeric: tabular-nums;
}

.nav-list__label {
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.nav-list__link[aria-current="page"],
.nav-list__link[data-current="true"] {
  background: linear-gradient(90deg, rgba(0, 229, 208, 0.16), rgba(0, 229, 208, 0) 88%);
  border-left-color: var(--cyan);
  color: var(--cyan);
}

.nav-list__link[aria-current="page"] .nav-list__idx,
.nav-list__link[data-current="true"] .nav-list__idx { color: var(--cyan); }

.rail__actions {
  display: grid;
  gap: 9px;
  margin-top: auto;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

/* ---------- 6. 顶部阅读进度 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 120;
  pointer-events: none;
  background: rgba(140, 154, 181, 0.14);
}

.scroll-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--cyan-soft) 58%, var(--orange) 100%);
}

/* ---------- 7. 按钮 ---------- */
.btn {
  --btn-bg: var(--ink-2);
  --btn-fg: var(--paper);
  --btn-line: transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 18px;
  border: 1px solid var(--btn-line);
  border-radius: 2px;
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.12em;
  line-height: 1.2;
  transition: transform 0.16s var(--ease), background-color 0.16s var(--ease),
    color 0.16s var(--ease), box-shadow 0.16s var(--ease);
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(0, 0, 0, 0.4); }
.btn:active { transform: translateY(0); }

.btn--cyan { --btn-bg: var(--cyan); --btn-fg: #04121A; }
.btn--orange { --btn-bg: var(--orange); --btn-fg: #1B0A00; }
.btn--ghost { --btn-bg: transparent; --btn-fg: var(--cyan); --btn-line: rgba(0, 229, 208, 0.45); }
.btn--ghost:hover { background: rgba(0, 229, 208, 0.12); }
.btn--block { width: 100%; }

/* ---------- 8. 页脚（四段式） ---------- */
.site-foot {
  margin-top: 96px;
  padding: 58px 24px 34px;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(11, 22, 48, 0.62) 0%, rgba(4, 9, 18, 0.96) 100%);
}

.site-foot__inner { width: 100%; max-width: var(--shell); margin: 0 auto; }

.foot-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 38px 32px;
}

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

.foot-col__title {
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-cyan);
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.foot-list { display: grid; gap: 10px; }

.foot-list a {
  color: var(--cyan-soft);
  font-size: 14px;
  line-height: 1.6;
  transition: color 0.16s var(--ease), padding-left 0.16s var(--ease);
}
.foot-list a:hover { color: var(--cyan); padding-left: 4px; }

.foot-contact { display: grid; gap: 10px; }

.foot-contact li {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 8px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--paper);
  word-break: break-word;
}

.foot-contact__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--slate);
  padding-top: 3px;
}

.foot-contact__note {
  grid-template-columns: 1fr;
  padding-top: 6px;
  border-top: 1px dashed var(--line-soft);
  font-size: 13px;
  color: var(--slate);
}

.foot-stamp__ver,
.foot-stamp__icp,
.foot-stamp__copy {
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate);
}

.foot-stamp__ver { color: var(--paper); }
.foot-stamp__icp { color: var(--cyan-soft); }
.foot-stamp__copy { font-family: var(--font-mono); font-size: 13px; letter-spacing: 0.06em; }

/* ---------- 9. 通用排版与容器 ---------- */
.shell { width: 100%; max-width: var(--shell); margin: 0 auto; padding: 0 24px; }

.section { padding: 56px 0; }

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 26px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.section__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--cyan);
  margin-bottom: 8px;
}

.section__title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(24px, 3.1vw, 38px);
  line-height: 1.2;
  color: var(--paper);
}

.kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--cyan);
}

.lede {
  max-width: 62ch;
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.85;
  color: #C9D3E6;
}

.display {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(56px, 12vw, 148px);
  line-height: 0.86;
  letter-spacing: -0.015em;
  text-transform: uppercase;
}

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

.link-cyan {
  color: var(--cyan);
  border-bottom: 1px solid var(--line-cyan);
  padding-bottom: 1px;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}
.link-cyan:hover { color: var(--cyan-soft); border-color: var(--cyan-soft); }

/* ---------- 10. 面板 / 网格 / 标签 ---------- */
.panel {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--ink-1);
}

.panel--glass {
  background: rgba(18, 34, 74, 0.55);
  border-color: rgba(127, 246, 234, 0.22);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.panel--cut {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.grid { display: grid; gap: 22px; }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--sidebar { grid-template-columns: minmax(0, 1fr) 300px; align-items: start; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  border: 1px solid var(--line-cyan);
  border-radius: 2px;
  background: rgba(0, 229, 208, 0.06);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  line-height: 1.4;
}

.tag--orange {
  color: var(--orange);
  border-color: rgba(255, 122, 26, 0.4);
  background: rgba(255, 122, 26, 0.09);
}

.tag--red {
  color: var(--red);
  border-color: rgba(226, 58, 46, 0.45);
  background: rgba(226, 58, 46, 0.1);
}

/* ---------- 11. 快速筛选条 ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: rgba(18, 34, 74, 0.5);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.filter-bar__group {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding-right: 10px;
  border-right: 1px solid var(--line-soft);
}
.filter-bar__group:last-child { border-right: 0; padding-right: 0; }

.filter-bar__btn {
  padding: 7px 12px;
  border: 1px solid transparent;
  border-radius: 2px;
  color: var(--slate);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  line-height: 1.4;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease), background-color 0.16s var(--ease);
}
.filter-bar__btn:hover { color: var(--cyan-soft); border-color: rgba(0, 229, 208, 0.3); }
.filter-bar__btn[aria-pressed="true"] {
  background: rgba(0, 229, 208, 0.14);
  border-color: rgba(0, 229, 208, 0.5);
  color: var(--cyan);
}

/* ---------- 12. 面包屑 ---------- */
.breadcrumb { padding: 20px 0 4px; }

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--slate);
}

.breadcrumb li { display: flex; align-items: center; gap: 8px; }
.breadcrumb li:not(:last-child)::after { content: "/"; opacity: 0.45; }
.breadcrumb a { color: var(--slate); transition: color 0.16s var(--ease); }
.breadcrumb a:hover { color: var(--cyan); }
.breadcrumb li[aria-current="page"] { color: var(--cyan-soft); }

/* ---------- 13. 图片容器基础（供页面阶段放置图片） ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: linear-gradient(160deg, var(--ink-2) 0%, var(--ink-0) 100%);
}

.media-frame > img,
.media-frame__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.06);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.35;
  background-image:
    repeating-linear-gradient(0deg, rgba(244, 246, 250, 0.05) 0 1px, transparent 1px 3px),
    linear-gradient(180deg, rgba(5, 11, 24, 0) 40%, rgba(5, 11, 24, 0.72) 100%);
}

.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--band { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }

/* ---------- 14. 滚动显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
}
[data-reveal].is-visible { opacity: 1; transform: none; }

/* ---------- 15. 桌面端主内容偏移 ---------- */
@media (min-width: 1024px) {
  body { padding-left: var(--rail-w); }
  .scroll-progress { left: var(--rail-w); }
}

/* ---------- 16. 平板 / 移动端 ---------- */
@media (max-width: 1023px) {
  body { padding-left: 0; }

  .site-rail {
    position: sticky;
    top: 0;
    bottom: auto;
    left: auto;
    z-index: 80;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    width: 100%;
    padding: 12px 16px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
    background: rgba(5, 11, 24, 0.94);
  }

  .rail__brand { position: relative; z-index: 3; flex: 1 1 auto; }
  .brand__mark { flex: 0 0 36px; width: 36px; height: 36px; font-size: 17px; }
  .brand__name { font-size: 17px; letter-spacing: 0.06em; }
  .brand__tag { font-size: 10px; letter-spacing: 0.1em; }

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

  .site-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 2;
    display: block;
    flex: none;
    padding: 84px 20px 32px;
    background: rgba(5, 11, 24, 0.985);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    pointer-events: none;
    transition: opacity 0.22s var(--ease), transform 0.22s var(--ease), visibility 0.22s var(--ease);
  }

  .site-rail[data-open] .site-nav {
    opacity: 1;
    visibility: visible;
    transform: none;
    pointer-events: auto;
  }

  .site-nav__caption { margin-bottom: 14px; }

  .nav-list { gap: 0; }

  .nav-list__link {
    grid-template-columns: 46px minmax(0, 1fr);
    padding: 15px 12px;
    font-size: 17px;
  }

  .nav-list__link + .nav-list__link { border-top: 1px solid var(--line-soft); }
  .nav-list__label { font-size: 17px; }

  .rail__actions {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-top: 28px;
    padding-top: 22px;
  }

  .grid--3,
  .grid--sidebar { grid-template-columns: 1fr; }

  .foot-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px 26px; }
  .site-foot { margin-top: 72px; padding: 46px 20px 30px; }
}

@media (max-width: 640px) {
  .shell { padding: 0 18px; }
  .section { padding: 40px 0; }
  .grid--2 { grid-template-columns: 1fr; }
  .filter-bar__group { border-right: 0; padding-right: 0; width: 100%; }
  .foot-grid { grid-template-columns: 1fr; }
  .site-foot { padding: 40px 18px 26px; }
  .panel { padding: 18px; }
}

/* ---------- 17. 无障碍动效降级 ---------- */
@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; }
  .btn:hover { transform: none; }
}