/* ==========================================
   山海机甲战队 — 暗色科技 · 山海蓝
   配色取自队徽：#253F70（深海）→ #319FD3（山岚）
   深色基底 + 山海蓝强调 + 硬朗边角 + 克制的玻璃质感
   ========================================== */

/* ==========================================
   1. 设计变量
   ========================================== */
:root {
  /* —— 基底 —— */
  --bg-root: #0a0b0d;
  --bg-surface: #101216;
  --bg-elevated: #16191e;
  --bg-glass: rgba(16, 18, 22, 0.72);
  --bg-glass-strong: rgba(255, 255, 255, 0.045);

  /* —— 品牌蓝（取自队徽）—— */
  --brand-navy: #253f70;
  --brand-blue: #205e99;
  --brand-azure: #319fd3;
  --accent: var(--brand-azure);
  --accent-bright: #4bb2e0;
  --accent-deep: #2b93c8;
  --accent-ink: #04202f;
  --accent-glow: rgba(49, 159, 211, 0.22);
  --accent-soft: rgba(49, 159, 211, 0.09);

  /* —— 文本（全部 ≥ 4.5:1 于 --bg-root）—— */
  --text-primary: #f2f5f9;
  --text-secondary: #a5b2c4;
  --text-muted: #8b98ac;

  /* —— 描边 —— */
  --border-subtle: rgba(255, 255, 255, 0.07);
  --border-medium: rgba(255, 255, 255, 0.12);
  --border-accent: rgba(49, 159, 211, 0.3);

  /* —— 阴影：环境光 + 直射光两层 —— */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4), 0 2px 8px rgba(3, 7, 18, 0.28);
  --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.35), 0 10px 28px rgba(3, 7, 18, 0.42);
  --shadow-lg: 0 4px 10px rgba(0, 0, 0, 0.35), 0 18px 48px rgba(32, 94, 153, 0.18);

  /* —— 字体 —— */
  --font-body: 'Noto Sans SC', ui-sans-serif, system-ui, 'PingFang SC', 'HarmonyOS Sans SC', 'Microsoft YaHei', sans-serif;
  --font-display: 'Barlow Condensed', 'Noto Sans SC', ui-sans-serif, system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Consolas, monospace;

  /* —— 字号（流式）—— */
  --fs-display: clamp(2.75rem, 7.5vw, 5.25rem);
  --fs-h2: clamp(1.75rem, 3.4vw, 2.625rem);
  --fs-h3: 1.25rem;
  --fs-body: 1rem;
  --fs-sm: 0.875rem;
  --fs-xs: 0.8125rem;
  --fs-2xs: 0.75rem;

  /* —— 圆角（同心：子元素 ≤ 父元素）—— */
  --radius-xs: 2px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-pill: 999px;

  /* —— 层级 —— */
  --z-header: 900;
  --z-menu-btn: 901;
  --z-nav-overlay: 890;
  --z-modal: 1000;

  --max-width: 1240px;
  --nav-height: 72px;
  --section-y: clamp(64px, 9vw, 104px);
  --transition: 0.25s cubic-bezier(.4, 0, .2, 1);
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html {
  font-family: var(--font-body);
  background: var(--bg-root);
  color: var(--text-primary);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  color-scheme: dark;
  scroll-padding-top: calc(var(--nav-height) + 16px);
}

body { min-height: 100vh; display: flex; flex-direction: column; line-height: 1.65; font-size: var(--fs-body); }
main { flex: 1; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { font: inherit; color: inherit; }
/* 组件上的 display 会盖掉 hidden 属性的 UA 样式，这里统一兜住 */
[hidden] { display: none !important; }

/* 锚点落点避开固定导航栏 */
section[id], [id] { scroll-margin-top: calc(var(--nav-height) + 24px); }

/* ==========================================
   2. 可访问性基线
   ========================================== */

/* 跳转到主内容（键盘/读屏用户） */
.skip-link {
  position: absolute; left: 50%; top: 0; transform: translate(-50%, -120%);
  z-index: calc(var(--z-modal) + 1);
  padding: 12px 22px; margin-top: 8px;
  background: var(--brand-azure); color: var(--accent-ink);
  font-size: var(--fs-sm); font-weight: 700;
  border-radius: var(--radius-sm);
  transition: transform 0.18s ease;
}
.skip-link:focus { transform: translate(-50%, 0); }

/* 统一可见焦点环 —— 只在键盘操作时出现 */
:focus-visible {
  outline: 2px solid var(--accent-bright);
  outline-offset: 3px;
  border-radius: var(--radius-xs);
}
:focus:not(:focus-visible) { outline: none; }

::selection { background: rgba(49, 159, 211, 0.32); color: #fff; }

/* 屏幕阅读器专用文本 */
.visually-hidden {
  position: absolute !important; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

/* 尊重系统的「减弱动态效果」：关掉所有非必要动效 */
@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;
    scroll-behavior: auto !important;
  }
}
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

/* ==========================================
   3. 导航栏 — 暗色透明 + 模糊
   ========================================== */
header {
  position: fixed; top: 0; left: 0; width: 100%;
  z-index: var(--z-header); height: var(--nav-height);
  background: rgba(10, 11, 13, .55);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: background var(--transition), box-shadow var(--transition);
}
header.scrolled {
  background: rgba(10, 11, 13, 0.9);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  box-shadow: 0 1px 0 var(--border-subtle);
}

nav {
  max-width: var(--max-width); margin: 0 auto; padding: 0 28px;
  height: 100%; display: flex; justify-content: space-between; align-items: center;
}

.logo { display: flex; align-items: center; gap: 10px; }
.logo-img { height: 38px; width: auto; object-fit: contain; }
.logo-text { font-size: 18px; font-weight: 800; color: var(--text-primary); letter-spacing: 0.5px; }
.logo-dot { display: inline-block; width: 5px; height: 5px; margin: 0 6px; background: var(--accent); vertical-align: middle; }
.logo-accent { color: var(--accent); }

nav ul { display: flex; gap: 2px; }
nav ul li a {
  display: inline-block;
  font-size: var(--fs-sm); font-weight: 500; padding: 8px 16px;
  color: var(--text-secondary); border-radius: var(--radius-sm);
  position: relative; transition: color var(--transition);
}
nav ul li a::after {
  content: ''; position: absolute; bottom: 2px; left: 50%;
  transform: translateX(-50%) scaleX(0); width: 16px; height: 2px;
  background: var(--accent); transition: transform var(--transition);
}
nav ul li a:hover { color: var(--text-primary); }
nav ul li a:hover::after,
nav ul li a.nav-active::after { transform: translateX(-50%) scaleX(1); }
nav ul li a.nav-active { color: var(--accent); font-weight: 600; }

.menu-toggle {
  display: none; flex-direction: column; gap: 5px; cursor: pointer;
  background: none; border: none; padding: 10px;
  min-width: 44px; min-height: 44px;
  align-items: center; justify-content: center;
  z-index: var(--z-menu-btn);
}
.menu-toggle span { display: block; width: 24px; height: 2px; background: var(--text-primary); border-radius: 1px; transition: transform var(--transition), opacity var(--transition); }
.menu-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ==========================================
   4. Hero — 视频背景 + 大字标题
   ========================================== */
.hero-section {
  position: relative; min-height: 100vh; min-height: 100svh; display: flex;
  align-items: center; justify-content: center; overflow: hidden;
  background: var(--bg-root);
}

.hero-video-wrap { position: absolute; inset: 0; z-index: 0; overflow: hidden; }
.hero-video {
  position: absolute; top: 50%; left: 50%;
  min-width: 100%; min-height: 100%;
  width: auto; height: auto;
  transform: translate(-50%, -50%);
  object-fit: cover;
}
/* 小屏设备算力有限，背景视频收益低、代价高，改用封面图 */
@media (max-width: 640px) {
  .hero-video { display: none; }
  .hero-video-wrap { background: url('source/banner/hero-poster.jpg') center/cover no-repeat; }
}
.hero-video-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(
    180deg,
    rgba(10, 11, 13, .62) 0%,
    rgba(10, 11, 13, .38) 40%,
    rgba(10, 11, 13, .72) 100%
  );
}

.hero-grid-bg {
  position: absolute; inset: 0; pointer-events: none; z-index: 0;
  background-image:
    linear-gradient(rgba(49, 159, 211, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(49, 159, 211, .05) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black 35%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black 35%, transparent 70%);
}

.hero-glow {
  position: absolute; border-radius: 50%; z-index: 0; pointer-events: none;
  filter: blur(120px); opacity: .2;
}
.hero-glow--1 { width: 500px; height: 500px; top: -150px; right: -150px; background: rgba(49, 159, 211, .18); }
.hero-glow--2 { width: 350px; height: 350px; bottom: 10%; left: -100px; background: rgba(37, 63, 112, .3); }

.hero-content { position: relative; z-index: 2; text-align: center; padding: 0 24px; }

/* 身份标识条：说明「这是谁」而不是「这是个产品」 */
.hero-badge {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 7px 18px; border-radius: var(--radius-pill);
  background: rgba(10, 11, 13, .5); border: 1px solid var(--border-accent);
  font-family: var(--font-display); font-size: 13px; font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: .16em; margin-bottom: 26px;
  backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
}
.hero-badge-dot { width: 7px; height: 7px; background: var(--accent); border-radius: 50%; }

.hero-title {
  font-size: var(--fs-display); font-weight: 900; line-height: 1.02;
  letter-spacing: 0.04em; margin-bottom: 18px; color: #fff;
  font-family: var(--font-display);
  text-shadow: 0 2px 30px rgba(0, 0, 0, .5);
}
.hero-title .hl { color: inherit; }
.hero-subtitle {
  font-size: clamp(1.05rem, 1.8vw, 1.35rem); font-weight: 600;
  color: var(--accent-bright);
  letter-spacing: 0.22em; margin-bottom: 18px;
}
.hero-desc {
  font-size: var(--fs-body); color: var(--text-secondary);
  margin-bottom: 40px; line-height: 1.75;
  max-width: 34em; margin-left: auto; margin-right: auto;
  text-wrap: pretty;
}
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* 背景视频开关：自动播放的活动内容需可暂停。
   位置上移，避让 hero 底部被数据条压住的那一段 */
.hero-media-toggle {
  position: absolute; right: 24px; bottom: 96px; z-index: 3;
  display: inline-flex; align-items: center; justify-content: center;
  width: 44px; height: 44px; padding: 0;
  background: rgba(10, 11, 13, .55); border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm); color: var(--text-secondary);
  cursor: pointer; backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}
.hero-media-toggle:hover { color: var(--text-primary); border-color: var(--border-accent); background: rgba(10, 11, 13, .8); }
.hero-media-toggle svg { width: 18px; height: 18px; }
.hero-media-toggle .icon-play { display: none; }
.hero-media-toggle[aria-pressed="true"] .icon-pause { display: none; }
.hero-media-toggle[aria-pressed="true"] .icon-play { display: block; }

.scroll-hint {
  position: absolute; bottom: 96px; left: 50%; transform: translateX(-50%);
  z-index: 2; cursor: pointer; display: flex; flex-direction: column; align-items: center; gap: 8px;
  color: var(--text-muted); font-size: var(--fs-2xs); letter-spacing: 0.2em;
  background: none; border: none; padding: 8px 12px;
}
.scroll-hint-line { width: 1px; height: 28px; background: linear-gradient(to bottom, var(--accent), transparent); }
.scroll-hint:hover { color: var(--text-secondary); }
@media (prefers-reduced-motion: no-preference) {
  .scroll-hint { animation: floatHint 2.5s ease-in-out infinite; }
}
@keyframes floatHint {
  0%, 100% { transform: translateX(-50%) translateY(0); opacity: .6; }
  50% { transform: translateX(-50%) translateY(8px); opacity: 1; }
}

/* ==========================================
   5. 按钮
   ========================================== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 46px; padding: 0 28px; font-size: var(--fs-sm); font-weight: 600;
  font-family: var(--font-body); cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition), border-color var(--transition),
              color var(--transition), box-shadow var(--transition), transform var(--transition);
  white-space: nowrap; border: none; letter-spacing: 0.3px;
}
/* 主按钮：亮蓝底 + 深海蓝字（沿用队徽的明暗关系，对比度 5.6:1） */
.btn-primary {
  background: linear-gradient(180deg, var(--accent-bright) 0%, var(--accent-deep) 100%);
  color: var(--accent-ink); font-weight: 700;
  box-shadow: 0 2px 14px var(--accent-glow);
}
.btn-primary:hover {
  background: linear-gradient(180deg, #5cbbe6 0%, var(--brand-azure) 100%);
  box-shadow: 0 6px 26px var(--accent-glow); transform: translateY(-1px);
}
.btn-outline { background: transparent; color: var(--text-primary); border: 1px solid var(--border-medium); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent-bright); background: var(--accent-soft); }
.btn-ghost { background: transparent; color: var(--text-secondary); }
.btn-ghost:hover { color: var(--accent-bright); background: var(--accent-soft); }
.btn:active { transform: translateY(0); }
.btn-sm { min-height: 40px; padding: 0 18px; font-size: var(--fs-xs); }

/* ==========================================
   6. Section
   ========================================== */
.section { padding: var(--section-y) 0; position: relative; }
.section--alt { background: var(--bg-surface); }
.section--tint { background: linear-gradient(180deg, var(--accent-soft) 0%, transparent 40%, transparent 60%, var(--accent-soft) 100%); }

.section-container { max-width: var(--max-width); margin: 0 auto; padding: 0 28px; }

/* 双语路标：保留中英对照的信息价值，去掉通栏大写间距的模板感 */
.section-eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-display); font-size: var(--fs-xs); font-weight: 600;
  color: var(--accent); letter-spacing: 0.08em; margin-bottom: 14px;
}
.section-eyebrow::before {
  content: ''; display: block; width: 6px; height: 6px;
  background: var(--accent); flex-shrink: 0;
}

.section-title {
  font-size: var(--fs-h2); font-weight: 800; line-height: 1.15;
  color: var(--text-primary); margin-bottom: 16px; letter-spacing: 0.01em;
  text-wrap: balance;
}
.section-desc {
  font-size: var(--fs-body); color: var(--text-secondary); max-width: 38em;
  margin-bottom: 52px; line-height: 1.75; text-wrap: pretty;
}

/* ==========================================
   7. 卡片基础
   ========================================== */
.card {
  background: var(--bg-glass);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle); border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.card:hover {
  transform: translateY(-3px);
  border-color: var(--border-accent);
  box-shadow: var(--shadow-lg);
}

/* 入场动效：只做一处编排好的开场（Hero 文案依次浮现），不做「每张卡片滚动浮现」的堆砌。
   减弱动效时整段自动失效；不依赖 JS，因此不存在内容卡在 opacity:0 的风险。 */
@media (prefers-reduced-motion: no-preference) {
  .hero-badge, .hero-title, .hero-subtitle, .hero-desc, .hero-actions {
    animation: heroIn 0.7s cubic-bezier(0.22, 0.61, 0.36, 1) backwards;
  }
  .hero-badge { animation-delay: 0.05s; }
  .hero-title { animation-delay: 0.12s; }
  .hero-subtitle { animation-delay: 0.2s; }
  .hero-desc { animation-delay: 0.26s; }
  .hero-actions { animation-delay: 0.34s; }
}
@keyframes heroIn {
  from { opacity: 0; translate: 0 14px; }
  to { opacity: 1; translate: none; }
}

/* ==========================================
   8. 数据条
   ========================================== */
.stats-strip {
  display: grid; grid-template-columns: repeat(4, 1fr);
  max-width: var(--max-width); margin: -60px auto 0;
  padding: 0 28px; gap: 14px; position: relative; z-index: 10;
}
.stat-box {
  background: var(--bg-elevated); border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md); padding: 28px 20px; text-align: center;
  box-shadow: var(--shadow-md); transition: transform var(--transition), border-color var(--transition);
}
.stat-box:hover { transform: translateY(-4px); border-color: var(--border-accent); }
.stat-box-num {
  font-family: var(--font-display); font-size: 2.75rem; font-weight: 700;
  color: var(--accent); line-height: 1; margin-bottom: 8px;
  font-variant-numeric: tabular-nums; letter-spacing: 0.01em;
}
.stat-box-label { font-size: var(--fs-sm); color: var(--text-secondary); font-weight: 500; }

/* ==========================================
   9. 关于我们
   ========================================== */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }
.about-text { font-size: var(--fs-body); line-height: 1.85; color: var(--text-secondary); }
.about-text strong { color: var(--text-primary); font-weight: 600; }
.about-text p { margin-bottom: 20px; }

.about-highlights { display: flex; flex-direction: column; gap: 14px; }
.highlight-item {
  display: flex; gap: 16px; padding: 20px;
  background: var(--bg-elevated); border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md); transition: border-color var(--transition);
}
.highlight-item:hover { border-color: var(--border-accent); }
.highlight-icon {
  width: 44px; height: 44px; flex-shrink: 0; border-radius: var(--radius-sm);
  background: var(--accent-soft); display: flex; align-items: center; justify-content: center;
  color: var(--accent);
}
.highlight-text h4 { font-size: var(--fs-body); font-weight: 700; color: var(--text-primary); margin-bottom: 4px; }
.highlight-text p { font-size: var(--fs-sm); color: var(--text-secondary); line-height: 1.6; }

.tech-cloud { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 40px; }
.tech-chip {
  padding: 8px 20px; font-size: var(--fs-xs); font-weight: 500; color: var(--text-secondary);
  background: var(--bg-elevated); border: 1px solid var(--border-subtle);
  border-radius: var(--radius-pill); transition: color var(--transition), border-color var(--transition), background-color var(--transition);
}
.tech-chip:hover { color: var(--accent-bright); border-color: var(--accent); background: var(--accent-soft); }

/* ==========================================
   10. 团队架构
   ========================================== */
.groups-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 20px; }
.group-card { padding: 36px 32px; display: flex; flex-direction: column; }
.group-card-head { display: flex; align-items: flex-start; gap: 18px; margin-bottom: 18px; }
.group-card-icon {
  width: 52px; height: 52px; flex-shrink: 0; border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
}
.group-card-icon--mech { background: rgba(49, 159, 211, .14); color: #5fb8e4; }
.group-card-icon--elec { background: rgba(250, 204, 21, .09); color: #facc15; }
.group-card-icon--vis { background: rgba(34, 197, 94, .09); color: #4ade80; }
.group-card-icon--comm { background: rgba(244, 114, 182, .09); color: #f472b6; }
.group-card-icon--hw { background: rgba(168, 85, 247, .09); color: #a855f7; }

.group-card h3 { font-size: var(--fs-h3); font-weight: 700; color: var(--text-primary); margin-bottom: 4px; }
.group-card p { font-size: var(--fs-xs); color: var(--text-muted); margin-bottom: 0; letter-spacing: 0.02em; }
.group-card > p { font-size: var(--fs-sm); color: var(--text-secondary); margin: 18px 0; line-height: 1.75; }
.group-skills { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 22px; flex: 1; }
.group-skill-tag {
  padding: 5px 14px; font-size: var(--fs-2xs); color: var(--text-secondary);
  background: var(--bg-glass-strong); border: 1px solid var(--border-subtle);
  border-radius: var(--radius-pill);
}
.group-link {
  display: inline-flex; align-items: center;
  font-size: var(--fs-sm); font-weight: 600; color: var(--accent-bright);
  align-self: flex-start;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), color var(--transition);
}
.group-link:hover { color: var(--accent); border-bottom-color: currentColor; }

/* ==========================================
   11. 战绩 — 年份分组
   ========================================== */
.ach-grid { display: flex; flex-direction: column; gap: 36px; }

.ach-year-head {
  display: flex; align-items: baseline; gap: 14px;
  margin-bottom: 16px; padding-bottom: 10px;
  border-bottom: 1px solid var(--border-subtle);
}
.ach-year-label {
  font-family: var(--font-display); font-size: 1.75rem; font-weight: 700;
  color: var(--accent); line-height: 1; font-variant-numeric: tabular-nums;
}
.ach-year-tagline {
  font-size: var(--fs-xs); font-weight: 600; color: var(--text-muted);
  letter-spacing: 0.08em;
}

.ach-year-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 10px; }

.ach-card {
  display: flex; align-items: flex-start; gap: 14px;
  padding: 16px 20px; border-radius: var(--radius-sm);
  background: var(--bg-glass); backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border-subtle);
  border-left: 3px solid transparent;
  transition: transform var(--transition), border-color var(--transition);
}
/* 注意：这里不用 border-color 简写，否则会覆盖掉金/银/铜的左侧色条 */
.ach-card:hover {
  transform: translateY(-2px);
  border-top-color: var(--border-accent);
  border-right-color: var(--border-accent);
  border-bottom-color: var(--border-accent);
}

.ach-card--gold { border-left-color: #e0a53b; }
.ach-card--silver { border-left-color: #a8b6c6; }
.ach-card--bronze { border-left-color: #c97a3c; }
.ach-card--outline { border-left-color: var(--accent); }

/* 奖牌图标：SVG + currentColor，颜色承载名次，文字承载等级 */
.ach-card-medal { flex-shrink: 0; width: 22px; height: 22px; margin-top: 2px; display: block; }
.ach-card--gold .ach-card-medal { color: #e0a53b; }
.ach-card--silver .ach-card-medal { color: #a8b6c6; }
.ach-card--bronze .ach-card-medal { color: #c97a3c; }
.ach-card--outline .ach-card-medal { color: var(--accent); }

.ach-card-info { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.ach-card-info strong { font-size: var(--fs-sm); font-weight: 700; color: var(--text-primary); line-height: 1.45; }
.ach-card-info small { font-size: var(--fs-2xs); color: var(--text-muted); line-height: 1.5; display: block; }

.ach-tag {
  display: inline-block; padding: 2px 8px; font-size: 10px; font-weight: 600;
  border-radius: var(--radius-pill); background: var(--accent-soft);
  color: var(--accent-bright); border: 1px solid rgba(49, 159, 211, .18);
  width: fit-content;
}
.ach-tag--main {
  background: rgba(49, 159, 211, .18); color: #7cc7e8;
  border-color: rgba(49, 159, 211, .32); font-weight: 700;
}

/* 其他竞赛 */
.ach-other { margin-top: 40px; }
.ach-other-title {
  font-size: var(--fs-sm); font-weight: 700; color: var(--text-muted);
  letter-spacing: 0.08em; margin-bottom: 14px;
}
.ach-other-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 8px; }

.ach-other-item {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 16px; border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, .02); border: 1px solid var(--border-subtle);
  font-size: var(--fs-xs); font-weight: 600; color: var(--text-primary);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  transition: border-color var(--transition);
}
.ach-other-item svg { flex-shrink: 0; width: 15px; height: 15px; color: #e0a53b; }
.ach-other-item span { font-weight: 400; color: var(--text-secondary); overflow: hidden; text-overflow: ellipsis; }
.ach-other-item:hover { border-color: var(--border-accent); }

/* ==========================================
   12. 机器人
   ========================================== */
.robots-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.robot-card { overflow: hidden; padding: 0; }
.robot-card-visual {
  height: 200px; display: flex; align-items: center; justify-content: center;
  position: relative; overflow: hidden;
  background: var(--accent-soft);
}
.robot-card-visual img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform .5s ease;
}
.robot-card:hover .robot-card-visual img { transform: scale(1.04); }

/* 图片缺失时的占位：用几何图形，不用 emoji */
.robot-visual-fallback {
  background: linear-gradient(135deg, rgba(49, 159, 211, .1), rgba(37, 63, 112, .06));
}
.robot-visual-fallback::after {
  content: ''; width: 46px; height: 46px; opacity: .35;
  background: currentColor; color: var(--accent);
  -webkit-mask: var(--icon-image) center/contain no-repeat;
  mask: var(--icon-image) center/contain no-repeat;
  --icon-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'%3E%3Crect x='3' y='6' width='18' height='14' rx='2'/%3E%3Ccircle cx='12' cy='13' r='3.5'/%3E%3Cpath d='M8 6l1.5-2.5h5L16 6'/%3E%3C/svg%3E");
}
.robot-card-body { padding: 24px; }
.robot-card-body h3 { font-size: var(--fs-h3); font-weight: 700; color: var(--text-primary); margin-bottom: 6px; }
.robot-card-body > p { font-size: var(--fs-sm); color: var(--text-secondary); line-height: 1.7; margin-bottom: 16px; }
.robot-specs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 18px; }
.robot-specs span {
  padding: 4px 12px; font-size: var(--fs-2xs); font-weight: 500; color: var(--text-secondary);
  background: var(--bg-glass-strong); border: 1px solid var(--border-subtle); border-radius: var(--radius-pill);
}

/* ==========================================
   13. 合作伙伴
   ========================================== */
.partners-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.partner-card {
  padding: 28px 16px; text-align: center; display: flex;
  flex-direction: column; align-items: center; gap: 8px;
}
.partner-logo { display: flex; align-items: center; justify-content: center; height: 56px; margin-bottom: 4px; }
.partner-logo img { max-height: 56px; max-width: 140px; width: auto; object-fit: contain; }
.partner-card-icon { display: flex; align-items: center; justify-content: center; width: 48px; height: 48px; border-radius: var(--radius-sm); background: var(--accent-soft); color: var(--accent); margin: 0 auto 4px; }
.partner-name { font-size: var(--fs-body); font-weight: 700; color: var(--text-primary); }
.partner-desc { font-size: var(--fs-2xs); color: var(--text-muted); }
.partner-vacancy { border-style: dashed; border-color: var(--border-medium); }
.partner-vacancy:hover { border-color: var(--accent); }

/* ==========================================
   14. 联系我们
   ========================================== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.contact-info-list { display: flex; flex-direction: column; gap: 12px; }
.contact-row {
  display: flex; align-items: center; gap: 16px; padding: 20px;
  border: 1px solid var(--border-subtle); border-radius: var(--radius-md);
  background: var(--bg-elevated); transition: border-color var(--transition);
}
.contact-row:hover { border-color: var(--border-accent); }
.contact-row-icon {
  width: 42px; height: 42px; flex-shrink: 0; border-radius: var(--radius-sm);
  background: var(--accent-soft); display: flex; align-items: center;
  justify-content: center; color: var(--accent);
}
.contact-row h4 { font-size: 0.9375rem; font-weight: 700; color: var(--text-primary); margin-bottom: 2px; }
.contact-row p, .contact-row a { font-size: var(--fs-sm); color: var(--text-secondary); }
.contact-row a { border-bottom: 1px solid transparent; }
.contact-row a:hover { color: var(--accent-bright); border-bottom-color: currentColor; }

.social-chips { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 4px; }
.social-chip {
  padding: 5px 14px; font-size: var(--fs-xs); font-weight: 500;
  color: var(--accent-bright); background: var(--accent-soft);
  border-radius: var(--radius-pill); transition: background-color var(--transition), color var(--transition);
}
a.social-chip:hover { background: var(--accent); color: var(--accent-ink); }

.join-card { padding: 36px; border-left: 3px solid var(--accent); }
/* .card:hover 的 border-color 简写会把左侧强调边一起改掉，这里补回来 */
.join-card:hover { border-left-color: var(--accent); }
.join-card h3 { font-size: 1.375rem; font-weight: 700; color: var(--text-primary); margin-bottom: 16px; }
.join-card p { font-size: 0.9375rem; color: var(--text-secondary); line-height: 1.75; margin-bottom: 14px; }
.join-card ul { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-bottom: 24px; }
.join-card ul li { font-size: var(--fs-sm); color: var(--text-secondary); padding-left: 20px; position: relative; }
.join-card ul li::before { content: ''; position: absolute; left: 4px; top: .62em; width: 6px; height: 6px; background: var(--accent); }

/* ==========================================
   15. 表单
   ========================================== */
.form-group { display: flex; flex-direction: column; gap: 8px; margin-bottom: 18px; }
.form-group label { font-size: var(--fs-xs); font-weight: 600; color: var(--text-secondary); letter-spacing: 0.02em; }
.form-group input,
.form-group textarea {
  width: 100%; padding: 12px 16px;
  font-family: var(--font-body); font-size: 1rem; /* ≥16px：避免 iOS 聚焦时放大 */
  color: var(--text-primary); background: var(--bg-elevated);
  border: 1px solid var(--border-medium); border-radius: var(--radius-sm);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.form-group textarea { resize: vertical; min-height: 120px; line-height: 1.7; }
.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--text-muted); }
.form-group input:hover,
.form-group textarea:hover { border-color: rgba(255, 255, 255, .2); }
.form-group input:focus,
.form-group textarea:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.form-hint { font-size: var(--fs-2xs); color: var(--text-muted); }
.form-narrow { max-width: 640px; }
.form-status { margin-top: 14px; font-size: var(--fs-xs); color: var(--accent-bright); }
.form-status[data-state="error"] { color: #f0a6a6; }
/* join-card 里的普通链接（按钮除外）用亮蓝，避免与正文混在一起 */
.join-card a:not(.btn) { color: var(--accent-bright); border-bottom: 1px solid transparent; }
.join-card a:not(.btn):hover { border-bottom-color: currentColor; }

/* ==========================================
   16. 页脚
   ========================================== */
footer {
  background: #07080a; border-top: 1px solid var(--border-subtle);
  padding: 64px 28px 28px; color: var(--text-secondary); position: relative; overflow: hidden;
}
footer::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--accent), rgba(49, 159, 211, .3), transparent);
}
.footer-container { max-width: var(--max-width); margin: 0 auto; position: relative; z-index: 1; }
.footer-main { display: grid; grid-template-columns: 2fr 1fr 1fr 1.2fr; gap: 40px; margin-bottom: 40px; }
.footer-brand-logo { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.footer-brand-name { font-size: 18px; font-weight: 800; color: #fff; }
.footer-brand p { font-size: var(--fs-sm); line-height: 1.75; color: var(--text-muted); }
.footer-col h4 { font-size: var(--fs-xs); font-weight: 700; color: var(--text-muted); letter-spacing: 0.08em; margin-bottom: 16px; }
.footer-col { display: flex; flex-direction: column; gap: 10px; }
.footer-col a { font-size: var(--fs-sm); color: var(--text-secondary); transition: color var(--transition); }
.footer-col a:hover { color: #fff; }

.footer-institutions { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; }
.footer-inst-logo {
  display: flex; align-items: center; padding: 8px 14px;
  background: rgba(255, 255, 255, .03); border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  transition: background-color var(--transition), border-color var(--transition);
}
.footer-inst-logo:hover { background: rgba(255, 255, 255, .08); border-color: rgba(255, 255, 255, .16); }
.footer-inst-logo img { height: 42px; width: auto; object-fit: contain; }

.footer-bottom {
  padding-top: 24px; border-top: 1px solid var(--border-subtle);
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  font-size: var(--fs-xs); color: var(--text-muted); flex-wrap: wrap;
}
.heart { color: #e2557a; }

/* ==========================================
   17. 成员卡片
   ========================================== */
.members-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 20px; }
.group-label, .member-group-label {
  grid-column: 1 / -1; font-size: var(--fs-xs); font-weight: 700; color: var(--accent);
  letter-spacing: 0.08em; margin-top: 28px; margin-bottom: 6px; padding-bottom: 10px;
  border-bottom: 1px solid var(--border-subtle);
}
.group-label:first-child, .member-group-label:first-child { margin-top: 0; }
.member-card { padding: 28px 24px; text-align: center; }
.member-avatar {
  width: 84px; height: 84px; border-radius: 50%; margin: 0 auto 18px;
  background: linear-gradient(135deg, var(--brand-navy) 0%, var(--brand-blue) 55%, var(--brand-azure) 100%);
  display: flex; align-items: center; justify-content: center; overflow: hidden;
  font-size: 30px; font-weight: 800; color: rgba(255, 255, 255, .9);
  box-shadow: 0 4px 20px rgba(32, 94, 153, .3);
}
.member-avatar img { width: 100%; height: 100%; object-fit: cover; }
.avatar-placeholder { font-size: 30px; font-weight: 800; color: rgba(255, 255, 255, .85); user-select: none; }
.member-card h3 { font-size: 1.125rem; font-weight: 700; margin-bottom: 6px; color: var(--text-primary); }
.member-role { font-size: var(--fs-xs); color: var(--accent-bright); font-weight: 600; margin-bottom: 8px; }
.member-major { font-size: var(--fs-xs); color: var(--text-secondary); margin-bottom: 8px; }
.member-bio { font-size: var(--fs-xs); color: var(--text-secondary); line-height: 1.6; }
.member-dest, .member-destination {
  font-size: var(--fs-xs); color: #facc15; font-weight: 600;
  margin-top: 12px; padding-top: 12px; border-top: 1px dashed var(--border-subtle);
}
.alumni-card { opacity: .84; }
.alumni-card:hover { opacity: 1; }

/* 可点击成员卡片 */
.member-card.is-clickable { cursor: pointer; }
.member-card.is-clickable:hover { transform: translateY(-4px); border-color: var(--border-accent); box-shadow: var(--shadow-md); }

/* 成员详情弹窗 */
.member-modal {
  position: fixed; inset: 0; z-index: var(--z-modal);
  display: flex; align-items: center; justify-content: center; padding: 24px;
  opacity: 0; pointer-events: none; transition: opacity .28s;
}
.member-modal.active { opacity: 1; pointer-events: auto; }
.member-modal-overlay { position: absolute; inset: 0; background: rgba(6, 7, 9, .82); backdrop-filter: blur(4px); }
.member-modal-panel {
  position: relative; z-index: 1; width: 100%; max-width: 520px; max-height: 86vh; overflow-y: auto;
  overscroll-behavior: contain;
  background: var(--bg-elevated); border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md); padding: 36px 32px 32px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, .5);
  transform: translateY(16px) scale(.98); transition: transform .28s;
}
.member-modal.active .member-modal-panel { transform: translateY(0) scale(1); }
.member-modal-close {
  position: absolute; top: 12px; right: 14px; width: 44px; height: 44px;
  display: flex; align-items: center; justify-content: center;
  background: none; border: none; color: var(--text-secondary);
  font-size: 30px; line-height: 1; cursor: pointer; border-radius: 50%;
  transition: color .2s, background-color .2s;
}
.member-modal-close:hover { color: var(--text-primary); background: rgba(255, 255, 255, .06); }
.member-modal-header { display: flex; align-items: center; gap: 18px; margin-bottom: 22px; }
.member-modal-avatar {
  flex: 0 0 auto; width: 78px; height: 78px; border-radius: 50%; overflow: hidden;
  background: linear-gradient(135deg, var(--brand-navy) 0%, var(--brand-blue) 55%, var(--brand-azure) 100%);
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 20px rgba(32, 94, 153, .3);
}
.member-modal-avatar img { width: 100%; height: 100%; object-fit: cover; }
.member-modal-heading { min-width: 0; }
.member-modal-heading h3 { font-size: 1.375rem; font-weight: 800; color: var(--text-primary); margin-bottom: 4px; }
.member-modal-role { font-size: var(--fs-sm); color: var(--accent-bright); font-weight: 600; margin-bottom: 2px; }
.member-modal-major { font-size: var(--fs-xs); color: var(--text-secondary); }
.member-modal-body { border-top: 1px solid var(--border-subtle); padding-top: 20px; }
.member-modal-body p { font-size: 0.90625rem; line-height: 1.8; color: var(--text-secondary); margin-bottom: 14px; }
.member-modal-body p:last-child { margin-bottom: 0; }

/* ==========================================
   18. 子页面头部
   ========================================== */
.page-header-section {
  padding: 140px 28px 60px; text-align: center;
  background: linear-gradient(180deg, var(--accent-soft) 0%, transparent 100%);
  position: relative;
}
.page-header-section::after {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-subtle), transparent);
}
.page-header-section .section-eyebrow { justify-content: center; }
.page-header-section .section-desc { margin-left: auto; margin-right: auto; }
.page-header-actions { margin-top: 28px; }

/* ==========================================
   19. 战队图集
   ========================================== */
.gallery-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 20px; }
.gallery-item {
  position: relative; border-radius: var(--radius-sm); overflow: hidden;
  aspect-ratio: 4 / 3; cursor: pointer; padding: 0;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  transition: border-color var(--transition);
  display: block; width: 100%;
}
.gallery-item:hover { border-color: var(--border-accent); }
.gallery-item img { width: 100%; height: 100%; object-fit: cover; transition: transform .45s ease; }
.gallery-item:hover img { transform: scale(1.04); }
.gallery-placeholder {
  width: 100%; height: 100%; display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  background: var(--bg-elevated); color: var(--text-muted);
  font-size: var(--fs-sm); gap: 8px; border: 1px dashed var(--border-subtle);
}
.gallery-overlay {
  position: absolute; bottom: 0; left: 0; right: 0; padding: 14px 18px;
  background: linear-gradient(transparent, rgba(10, 11, 13, .88)); color: #fff;
  font-size: var(--fs-sm); font-weight: 600;
  transform: translateY(8px); transition: opacity .3s, transform .3s; pointer-events: none;
}
@media (hover: hover) {
  .gallery-overlay { opacity: 0; }
  .gallery-item:hover .gallery-overlay,
  .gallery-item:focus-visible .gallery-overlay { opacity: 1; transform: translateY(0); }
}

.gallery-lightbox {
  position: fixed; inset: 0; background: rgba(6, 7, 9, .96); z-index: var(--z-modal);
  display: flex; align-items: center; justify-content: center; flex-direction: column;
  opacity: 0; pointer-events: none; transition: opacity .3s;
}
.gallery-lightbox.active { opacity: 1; pointer-events: auto; }
.gallery-lightbox img { max-width: 90vw; max-height: 80vh; border-radius: var(--radius-sm); box-shadow: 0 8px 40px rgba(0, 0, 0, .5); object-fit: contain; }
.gallery-lightbox-close {
  position: absolute; top: 20px; right: 24px; z-index: 1;
  display: flex; align-items: center; justify-content: center;
  width: 48px; height: 48px; padding: 0;
  background: rgba(10, 11, 13, .6); border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  font-size: 1.75rem; line-height: 1; color: #fff; cursor: pointer;
  transition: background-color .2s, border-color .2s;
}
.gallery-lightbox-close:hover { background: rgba(255, 255, 255, .12); border-color: var(--border-accent); }
.gallery-lightbox-title { margin-top: 16px; color: rgba(255, 255, 255, .88); font-size: var(--fs-body); font-weight: 500; }

/* ==========================================
   20. 项目开源
   ========================================== */
.forum-section { margin-bottom: 40px; }
.forum-header { text-align: center; margin-bottom: 36px; }
.forum-header h2 { font-size: 1.625rem; font-weight: 800; color: var(--text-primary); margin-bottom: 8px; }
.forum-subtitle { color: var(--text-secondary); font-size: var(--fs-sm); }
#forum-links-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(360px, 1fr)); gap: 18px; }
.forum-card {
  display: flex; align-items: flex-start; gap: 16px; padding: 22px;
  background: var(--bg-glass); backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border-subtle); border-radius: var(--radius-md);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.forum-card:hover { transform: translateY(-3px); border-color: var(--border-accent); box-shadow: var(--shadow-md); }
.forum-card-icon {
  flex-shrink: 0; width: 46px; height: 46px; border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  background: var(--accent-soft); color: var(--accent);
}
.forum-card-icon svg { width: 22px; height: 22px; }
.forum-card-content { flex: 1; min-width: 0; }
.forum-card-title { font-size: var(--fs-body); font-weight: 700; color: var(--text-primary); margin-bottom: 6px; display: flex; align-items: center; gap: 8px; }
.forum-tag {
  display: inline-block; font-size: 11px; font-weight: 600;
  background: var(--accent); color: var(--accent-ink);
  padding: 2px 10px; border-radius: var(--radius-pill); white-space: nowrap;
}
.forum-card-desc { font-size: var(--fs-sm); color: var(--text-secondary); line-height: 1.6; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

.projects-container { margin-bottom: 60px; }
.projects-header { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; margin-bottom: 32px; }
.projects-header h2 { font-size: 1.625rem; font-weight: 800; color: var(--text-primary); }
#repo-search-input {
  padding: 11px 20px; border: 1px solid var(--border-medium); border-radius: var(--radius-pill);
  font-size: 1rem; font-family: var(--font-body); background: var(--bg-elevated);
  color: var(--text-primary); min-width: 260px;
  transition: border-color var(--transition), box-shadow var(--transition);
}
#repo-search-input:focus-visible { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
#projects-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(360px, 1fr)); gap: 18px; }
.repo-card {
  display: block; background: var(--bg-glass); backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border-subtle); border-radius: var(--radius-md);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.repo-card:hover { transform: translateY(-3px); border-color: var(--border-accent); box-shadow: var(--shadow-md); }
.repo-card-inner { padding: 22px; display: flex; flex-direction: column; height: 100%; }
.repo-name { font-size: 1.0625rem; font-weight: 700; color: var(--text-primary); margin-bottom: 8px; }
.external-tag { display: inline-block; font-size: 11px; font-weight: 600; background: #facc15; color: #1a1405; padding: 2px 10px; border-radius: var(--radius-pill); margin-left: 6px; vertical-align: middle; }
.repo-desc { font-size: var(--fs-sm); color: var(--text-secondary); line-height: 1.65; flex-grow: 1; margin-bottom: 14px; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.repo-meta { display: flex; flex-wrap: wrap; gap: 14px; font-size: var(--fs-xs); color: var(--text-muted); align-items: center; }
.repo-lang { display: inline-block; padding: 3px 10px; border-radius: var(--radius-pill); background: var(--accent-soft); color: var(--accent-bright); font-size: var(--fs-2xs); font-weight: 600; font-family: var(--font-mono); }
.repo-updated { margin-left: auto; }

/* ==========================================
   21. 机器人详情页
   ========================================== */
.robot-detail-container { max-width: 900px; }
.group-detail-badge { display: flex; justify-content: center; margin-bottom: 8px; }
.group-detail-badge .group-card-icon {
  width: 72px; height: 72px; border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
}
.robot-detail-hero {
  position: relative; width: 100%; aspect-ratio: 16 / 9;
  border-radius: var(--radius-sm); overflow: hidden;
  border: 1px solid var(--border-subtle); background: var(--bg-elevated);
}
.robot-detail-hero img { width: 100%; height: 100%; object-fit: cover; }
.robot-detail-specs { justify-content: center; margin: 24px 0 4px; }
.robot-block { padding: 26px 28px; margin-top: 24px; }
.robot-block-title {
  font-size: 1.125rem; font-weight: 700; color: var(--text-primary);
  margin-bottom: 16px; padding-left: 12px; position: relative;
}
.robot-block-title::before {
  content: ''; position: absolute; left: 0; top: 2px; bottom: 2px;
  width: 3px; background: var(--accent); border-radius: 2px;
}
.robot-role p { font-size: 0.9375rem; color: var(--text-secondary); line-height: 1.8; }
.robot-stack-group { display: flex; align-items: flex-start; gap: 16px; padding: 12px 0; }
.robot-stack-group + .robot-stack-group { border-top: 1px solid var(--border-subtle); }
.robot-stack-label {
  flex: 0 0 64px; font-size: var(--fs-sm); font-weight: 600; color: var(--text-primary);
  padding-top: 5px;
}
.robot-stack .robot-specs { margin-bottom: 0; }
.robot-detail-nav {
  display: flex; justify-content: space-between; gap: 12px;
  margin-top: 32px; flex-wrap: wrap;
}

/* ==========================================
   22. 赛季时间线
   ========================================== */
.timeline { position: relative; padding-left: 32px; }
.timeline::before {
  content: ''; position: absolute; left: 7px; top: 8px; bottom: 8px; width: 1px;
  background: linear-gradient(180deg, var(--accent), rgba(49, 159, 211, .18) 60%, transparent);
}
.timeline-item { position: relative; padding-bottom: 40px; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: ''; position: absolute; left: -32px; top: 7px;
  width: 15px; height: 15px; border-radius: 50%;
  background: var(--bg-root); border: 2px solid var(--accent);
}
.timeline-item--milestone::before { background: var(--accent); box-shadow: 0 0 0 4px var(--accent-soft); }
.timeline-date {
  font-family: var(--font-display); font-size: var(--fs-xs); font-weight: 700;
  color: var(--accent); letter-spacing: 0.1em; margin-bottom: 6px;
  font-variant-numeric: tabular-nums;
}
.timeline-title { font-size: 1.125rem; font-weight: 700; color: var(--text-primary); margin-bottom: 8px; }
.timeline-body { font-size: var(--fs-sm); color: var(--text-secondary); line-height: 1.8; max-width: 62ch; }
.timeline-body strong { color: var(--text-primary); font-weight: 600; }

.honor-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 12px; }
.honor-card {
  display: flex; align-items: center; gap: 14px; padding: 16px 18px;
  background: var(--bg-elevated); border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm); transition: border-color var(--transition);
}
.honor-card:hover { border-color: var(--border-accent); }
.honor-card svg { flex-shrink: 0; width: 20px; height: 20px; }
.honor-card--gold svg { color: #e0a53b; }
.honor-card--silver svg { color: #a8b6c6; }
.honor-card--bronze svg { color: #c97a3c; }
.honor-card-body { min-width: 0; }
.honor-card-title { font-size: var(--fs-sm); font-weight: 700; color: var(--text-primary); }
.honor-card-meta { font-size: var(--fs-2xs); color: var(--text-muted); margin-top: 2px; }
.subsection-title {
  font-size: 1.25rem; font-weight: 800; color: var(--text-primary);
  margin: 48px 0 20px; display: flex; align-items: center; gap: 12px;
}
.subsection-title svg { width: 20px; height: 20px; color: var(--accent); }

/* ==========================================
   23. 响应式
   ========================================== */
@media (max-width: 1024px) {
  .about-grid { grid-template-columns: 1fr; }
  .groups-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .partners-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-main { grid-template-columns: 1fr 1fr; }
  .robots-grid { grid-template-columns: 1fr 1fr; }
  .stats-strip { grid-template-columns: repeat(2, 1fr); margin-top: 0; padding-top: 24px; }
}
@media (max-width: 768px) {
  :root { --nav-height: 64px; }
  .section { padding: 64px 0; }
  .section-container, nav { padding: 0 20px; }
  .menu-toggle { display: flex; }
  nav ul {
    position: fixed; top: 0; left: 0; width: 100%; height: 100vh; height: 100svh;
    background: rgba(10, 11, 13, .98); backdrop-filter: blur(20px);
    flex-direction: column; justify-content: center; align-items: center; gap: 20px;
    transform: translateY(-100%); opacity: 0; z-index: var(--z-nav-overlay);
    transition: transform .4s cubic-bezier(.22, .61, .36, 1), opacity .3s;
    visibility: hidden;
  }
  nav ul.active { transform: translateY(0); opacity: 1; visibility: visible; }
  nav ul li a { font-size: 1.25rem; padding: 12px 20px; }
  .robots-grid { grid-template-columns: 1fr; }
  .footer-main { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  .ach-year-cards { grid-template-columns: 1fr; }
  #forum-links-list, #projects-list { grid-template-columns: 1fr; }
  .projects-header { flex-direction: column; align-items: flex-start; }
  .projects-header #repo-search-input { width: 100%; min-width: 0; }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
  .join-card ul { grid-template-columns: 1fr; }
  .robot-stack-group { flex-direction: column; gap: 8px; }
  .robot-stack-label { padding-top: 0; }
  .robot-detail-nav .btn { flex: 1 1 100%; text-align: center; }
  .hero-media-toggle { right: 16px; bottom: 16px; }
  .page-header-section { padding: 120px 20px 44px; }
}
@media (max-width: 480px) {
  .hero-title { letter-spacing: 0.02em; }
  .hero-desc { font-size: 0.9375rem; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { width: 100%; }
  .partners-grid { grid-template-columns: 1fr; }
  .stats-strip { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .stat-box { padding: 20px 12px; }
  .stat-box-num { font-size: 2.25rem; }
  .members-grid { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
  .member-modal { padding: 14px; }
  .member-modal-panel { padding: 30px 20px 24px; max-height: 90vh; }
  .member-modal-header { flex-direction: column; text-align: center; gap: 14px; }
  .timeline { padding-left: 26px; }
  .timeline-item::before { left: -26px; }
}