/* ==========================================================================
   云开平台赛场 · /assets/site.css
   共享层：reset / 变量 / 中文排版 / 头部 / 页脚 / 按钮 / 面包屑 / 网格 / 组件地基
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 112px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background-color: #04070E;
  color: #F4F6F8;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", "Noto Sans SC", sans-serif;
  font-size: 16.5px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 { margin: 0; font-weight: 800; line-height: 1.18; letter-spacing: 0.01em; }
p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }
ul, ol { margin: 0; padding: 0; }
img, svg, video { display: block; max-width: 100%; }
img { height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }
figure, blockquote { margin: 0; }
hr { border: 0; border-top: 1px solid #22456F; margin: 0; }

::selection { background: #FF6B1A; color: #0A0F16; }

:where(a, button, summary, input, select, textarea, [tabindex]):focus-visible {
  outline: 2px solid #FF6B1A;
  outline-offset: 3px;
}

/* --------------------------------------------------------- 变量 */
:root {
  --ink-900: #04070E;
  --ink-800: #0A1730;
  --ink-700: #12294C;
  --ink-600: #22456F;
  --paper:   #F4F6F8;
  --mist:    #9AA8BC;
  --signal:  #FF6B1A;
  --signal-soft: #FFB37A;
  --pitch:   #17B26A;
  --amber:   #E8A33D;

  --line: #22456F;
  --line-soft: rgba(34, 69, 111, 0.45);
  --line-hair: rgba(154, 168, 188, 0.18);

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

  --hdr-h: 64px;
  --rail-w: 56px;
  --wrap-w: 1360px;
  --gap: 24px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* --------------------------------------------------------- 容器 */
.wrap {
  width: 100%;
  max-width: var(--wrap-w);
  margin-inline: auto;
  padding-inline: clamp(16px, 3.2vw, 40px);
}

/* --------------------------------------------------------- 跳转链接 */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 300;
  padding: 10px 20px;
  background: var(--signal);
  color: #0A0F16;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  transform: translateY(-180%);
  transition: transform 0.16s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible { transform: translateY(0); outline: 2px solid var(--paper); outline-offset: 2px; }

/* ==========================================================================
   头部
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: rgba(4, 7, 14, 0.95);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line-soft);
}

/* --- 状态带 --- */
.status-strip {
  height: 30px;
  overflow: hidden;
  background: #02040A;
  border-bottom: 1px solid var(--line-soft);
  transition: height 0.2s var(--ease), border-color 0.2s var(--ease);
}
.status-strip__inner {
  display: flex;
  align-items: center;
  gap: 18px;
  height: 30px;
}
.status-strip__label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.24em;
  color: var(--ink-600);
  white-space: nowrap;
}
.status-strip__list {
  display: flex;
  align-items: center;
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
  min-width: 0;
}
.status-strip__link {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  color: var(--signal-soft);
  border-bottom: 1px solid transparent;
  white-space: nowrap;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}
.status-strip__link:hover { color: var(--signal); border-bottom-color: var(--signal); }

/* --- 信号灯 --- */
.status-dot {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: var(--paper);
  white-space: nowrap;
}
.status-dot__lamp {
  display: block;
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  background: var(--mist);
  animation: lamp-breathe 3s ease-in-out infinite;
}
.status-dot.is-live .status-dot__lamp { background: var(--pitch); }
.status-dot.is-warn .status-dot__lamp { background: var(--amber); }
.status-dot__text { display: inline-block; }

@keyframes lamp-breathe {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.55; }
}

/* --- 命令栏 --- */
.cmd-bar {
  height: var(--hdr-h);
  transition: height 0.2s var(--ease);
}
.cmd-bar__inner {
  display: flex;
  align-items: center;
  gap: 26px;
  height: 100%;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  color: var(--paper);
}
.brand__mark {
  position: relative;
  display: block;
  width: 12px;
  height: 12px;
  flex: 0 0 auto;
  background: var(--signal);
  transition: transform 0.16s var(--ease);
}
.brand__mark::before {
  content: "";
  position: absolute;
  inset: -5px;
  border: 1px solid var(--line);
}
.brand:hover .brand__mark { transform: translateY(-2px); }
.brand__text { display: flex; flex-direction: column; line-height: 1.1; }
.brand__name { font-size: 17px; font-weight: 800; letter-spacing: 0.02em; }
.brand__meta {
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.26em;
  color: var(--mist);
}
.brand--footer { margin-bottom: 18px; }

/* 索引带导航 */
.cmd-nav {
  display: flex;
  align-items: stretch;
  justify-content: flex-end;
  gap: 2px;
  flex: 1 1 auto;
  min-width: 0;
}
.cmd-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 12px 11px;
  color: var(--mist);
  white-space: nowrap;
  transition: color 0.16s var(--ease);
}
.cmd-link__num {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.04em;
  color: rgba(154, 168, 188, 0.55);
  transition: color 0.16s var(--ease);
}
.cmd-link__label { font-size: 14px; font-weight: 600; letter-spacing: 0.04em; }
.cmd-link::after {
  content: "";
  position: absolute;
  left: 11px;
  right: 11px;
  bottom: 6px;
  height: 2px;
  background: var(--signal);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.18s var(--ease);
}
.cmd-link:hover { color: var(--paper); }
.cmd-link:hover::after { transform: scaleX(1); }
.cmd-link:hover .cmd-link__num { color: var(--signal-soft); }
.cmd-link[aria-current="page"] { color: var(--paper); }
.cmd-link[aria-current="page"]::after { transform: scaleX(1); }
.cmd-link[aria-current="page"] .cmd-link__num { color: var(--signal); }

/* 头部行动区 */
.cmd-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  padding: 9px 13px;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--paper);
  cursor: pointer;
  transition: border-color 0.16s var(--ease), color 0.16s var(--ease);
}
.nav-toggle:hover { border-color: var(--signal-soft); color: var(--signal-soft); }
.nav-toggle__glyph {
  position: relative;
  display: block;
  width: 16px;
  height: 12px;
}
.nav-toggle__glyph::before,
.nav-toggle__glyph::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
  background: currentColor;
  transition: transform 0.18s var(--ease), top 0.18s var(--ease);
}
.nav-toggle__glyph::before { top: 2px; }
.nav-toggle__glyph::after  { top: 9px; }
.nav-toggle__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
}

/* 滚动进度 */
.scroll-meter { height: 2px; background: transparent; }
.scroll-meter__bar {
  display: block;
  height: 100%;
  width: 0;
  background: var(--signal);
}

/* 压缩态 */
.site-header[data-scrolled] .status-strip { height: 0; border-bottom-color: transparent; }
.site-header[data-scrolled] .cmd-bar { height: 48px; }
.site-header[data-scrolled] .brand__meta { display: none; }

/* ==========================================================================
   按钮
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid transparent;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.2;
  text-align: center;
  cursor: pointer;
  transition: transform 0.16s var(--ease), background-color 0.16s var(--ease),
              border-color 0.16s var(--ease), color 0.16s var(--ease);
}
.btn:hover { transform: translateY(-2px); }
.btn--solid { background: var(--signal); border-color: var(--signal); color: #0A0F16; }
.btn--solid:hover { background: var(--signal-soft); border-color: var(--signal-soft); }
.btn--ghost { background: transparent; border-color: var(--line); color: var(--paper); }
.btn--ghost:hover { border-color: var(--signal-soft); color: var(--signal-soft); }
.btn--sm { padding: 8px 14px; font-size: 13px; }

/* ==========================================================================
   页脚 · 横向坐标轴
   ========================================================================== */
.site-footer {
  background: var(--ink-800);
  border-top: 1px solid var(--line);
}
.footer-axis {
  height: 22px;
  border-bottom: 1px solid var(--line-soft);
  background-image: repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 34px);
  background-repeat: no-repeat;
  background-position: left top;
  background-size: auto 10px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 0.7fr 0.7fr 0.7fr 1.25fr;
  gap: 40px 36px;
  padding-block: clamp(40px, 5vw, 64px) clamp(32px, 4vw, 48px);
}

.footer-slogan {
  font-size: clamp(17px, 1.6vw, 20px);
  font-weight: 800;
  line-height: 1.45;
  letter-spacing: 0.01em;
  margin-bottom: 10px;
}
.footer-note { font-size: 13.5px; line-height: 1.7; color: var(--mist); max-width: 30ch; }

.footer-col__title {
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.26em;
  color: var(--mist);
  text-transform: uppercase;
}
.footer-list { list-style: none; display: grid; gap: 10px; }
.footer-link {
  display: inline-block;
  font-size: 14px;
  color: var(--paper);
  border-bottom: 1px solid transparent;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}
.footer-link:hover { color: var(--signal-soft); border-bottom-color: var(--signal-soft); }

.footer-col--contact { min-width: 0; }
.contact-list {
  list-style: none;
  display: grid;
  gap: 9px;
  margin-bottom: 20px;
}
.contact-list__item {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  font-size: 13.5px;
  line-height: 1.6;
}
.contact-list__key {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--mist);
}
.contact-list__val { color: var(--paper); word-break: break-word; }

.footer-status {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  list-style: none;
  padding-top: 16px;
  border-top: 1px solid var(--line-hair);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 26px;
  padding-block: 20px 32px;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--mist);
}
.footer-legal__icp { color: var(--mist); }
.footer-legal__copy { color: var(--paper); }
.footer-legal__note { color: rgba(154, 168, 188, 0.78); }

/* ==========================================================================
   排版工具
   ========================================================================== */
.title-xl {
  font-size: clamp(34px, 4.6vw, 64px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.01em;
}
.title-lg {
  font-size: clamp(22px, 2.4vw, 32px);
  font-weight: 800;
  line-height: 1.25;
}
.lede {
  font-size: clamp(16.5px, 1.5vw, 19px);
  line-height: 1.72;
  color: var(--mist);
  max-width: 62ch;
}
.measure { max-width: 64ch; }
.text-mist { color: var(--mist); }
.text-signal { color: var(--signal); }
.anno {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--mist);
}
.v-anno {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--mist);
}
.num-xl {
  font-family: var(--font-mono);
  font-size: clamp(56px, 9vw, 132px);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}
.num-md {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 40px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
}

/* ==========================================================================
   面包屑
   ========================================================================== */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mist);
}
.crumbs a {
  color: var(--mist);
  border-bottom: 1px solid transparent;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}
.crumbs a:hover { color: var(--signal-soft); border-bottom-color: currentColor; }
.crumbs__sep { color: var(--line); }
.crumbs [aria-current="page"] { color: var(--paper); }

/* ==========================================================================
   章节 / 网格 / 模块
   ========================================================================== */
.section {
  position: relative;
  padding-block: clamp(56px, 7vw, 104px);
  border-top: 1px solid var(--line-soft);
}
.section--flush { border-top: 0; }
.band-ink { background: var(--ink-800); }
.band-panel { background: var(--ink-700); }

.grid12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gap);
}
.split-5-7 {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: var(--gap);
}
.split-4-8 {
  display: grid;
  grid-template-columns: 4fr 8fr;
  gap: var(--gap);
}

.panel {
  background: var(--ink-700);
  border: 1px solid var(--line);
  padding: clamp(18px, 2vw, 28px);
  transition: transform 0.16s var(--ease), border-color 0.16s var(--ease);
}
.panel:hover { transform: translateY(-2px); border-color: var(--signal); }

.ticks {
  height: 14px;
  border-top: 1px solid var(--line-soft);
  background-image: repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 24px);
  background-repeat: no-repeat;
  background-position: left top;
  background-size: auto 8px;
}

/* ==========================================================================
   图片容器地基（页面阶段放置真实图片）
   ========================================================================== */
.figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-700);
  overflow: hidden;
}
.figure__media {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  background-color: var(--ink-800);
  background-image:
    linear-gradient(180deg, rgba(34, 69, 111, 0.45), rgba(4, 7, 14, 0.92)),
    repeating-linear-gradient(90deg, rgba(34, 69, 111, 0.32) 0 1px, transparent 1px 40px),
    repeating-linear-gradient(0deg, rgba(34, 69, 111, 0.22) 0 1px, transparent 1px 40px);
  overflow: hidden;
}
.figure__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.figure--wide .figure__media { aspect-ratio: 21 / 9; }
.figure--portrait .figure__media { aspect-ratio: 4 / 5; }
.figure__cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--mist);
}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 1180px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-brand { grid-column: 1 / -1; }
  .footer-col--contact { grid-column: 1 / -1; }
  .footer-note { max-width: 46ch; }
}

@media (max-width: 1080px) {
  :root { --hdr-h: 60px; }
  html { scroll-padding-top: 96px; }

  .cmd-actions { display: none; }
  .nav-toggle { display: inline-flex; }

  .cmd-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex: 0 0 auto;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    background: linear-gradient(180deg, var(--ink-800) 0%, var(--ink-900) 100%);
    border-bottom: 1px solid var(--line);
    transition: max-height 0.26s var(--ease), visibility 0.26s var(--ease);
  }
  .site-header[data-open] .cmd-nav {
    max-height: calc(100dvh - 48px);
    overflow-y: auto;
    visibility: visible;
  }
  .cmd-link {
    width: 100%;
    align-items: baseline;
    padding: 15px 24px;
    border-bottom: 1px solid var(--line-hair);
  }
  .cmd-link::after { display: none; }
  .cmd-link__label { font-size: 15px; }
  .cmd-link[aria-current="page"] {
    border-left: 3px solid var(--signal);
    padding-left: 21px;
    background: rgba(255, 107, 26, 0.07);
  }
  .site-header[data-open] .nav-toggle__glyph::before { top: 6px; transform: rotate(45deg); }
  .site-header[data-open] .nav-toggle__glyph::after  { top: 6px; transform: rotate(-45deg); }

  .split-5-7,
  .split-4-8 { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 900px) {
  .status-strip__label { display: none; }
  .grid12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  :root { --hdr-h: 56px; --gap: 16px; }

  .brand__name { font-size: 15.5px; }
  .brand__meta { display: none; }
  .status-strip__list { gap: 12px; }
  .status-dot { font-size: 9.5px; letter-spacing: 0.1em; }
  .cmd-bar__inner { gap: 12px; }

  .footer-grid { grid-template-columns: minmax(0, 1fr); gap: 30px; }
  .footer-brand,
  .footer-col--contact { grid-column: auto; }
  .footer-legal { flex-direction: column; align-items: flex-start; gap: 8px; }

  .grid12 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* ==========================================================================
   动效偏好
   ========================================================================== */
@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;
  }
  .panel:hover,
  .btn:hover,
  .brand:hover .brand__mark { transform: none; }
}