/* ============================================================
   半岛娱乐看台 — 共享样式表 /assets/site.css
   夜看台黑底 + 框架式导航 + 堆叠切角面板
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

body, h1, h2, h3, h4, h5, h6, p, ul, ol, li, figure, blockquote, dl, dd, fieldset {
  margin: 0;
  padding: 0;
}

ul, ol { list-style: none; }

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

a { color: inherit; text-decoration: none; }

button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

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

/* ---------- 2. 设计变量 ---------- */
:root {
  /* 品牌色板 */
  --c-night: #070B12;
  --c-stand: #0E1726;
  --c-panel: #16223A;
  --c-orange: #FF6A1A;
  --c-cyan: #23E0C8;
  --c-warm: #F5F1E8;
  --c-muted: #A8B3C4;
  --c-line: #5B6B85;
  --c-amber: #E8B33A;
  --c-deep: #0B2E3A;

  /* 派生 */
  --edge: rgba(91, 107, 133, 0.34);
  --edge-soft: rgba(91, 107, 133, 0.18);
  --edge-strong: rgba(91, 107, 133, 0.62);
  --orange-soft: rgba(255, 106, 26, 0.5);
  --cyan-soft: rgba(35, 224, 200, 0.42);
  --amber-soft: rgba(232, 179, 58, 0.45);

  /* 尺寸 */
  --rail-w: 252px;
  --quickbar-h: 54px;
  --bar-mobile-h: 64px;
  --container-max: 1280px;
  --cut: 26px;

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

  /* 运动 */
  --ease: cubic-bezier(0.22, 0.68, 0, 1);
  --dur: 260ms;
}

/* ---------- 3. 基础排版 ---------- */
html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--quickbar-h) + 24px);
  -webkit-text-size-adjust: 100%;
}

@media (min-width: 1024px) {
  html[data-rail="collapsed"] { --rail-w: 78px; }
}

body {
  background: var(--c-night);
  color: var(--c-warm);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  padding-top: var(--quickbar-h);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

@media (min-width: 1024px) {
  body { padding-left: var(--rail-w); }
}

@media (max-width: 1023px) {
  body { padding-bottom: var(--bar-mobile-h); }
}

h1, h2, h3, h4 { line-height: 1.28; }

img { height: auto; }

::selection {
  background: var(--c-orange);
  color: var(--c-night);
}

:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 3px;
  border-radius: 1px;
}

/* 超大细字重标题 */
.bk-display {
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(44px, 8vw, 96px);
  line-height: 0.94;
  letter-spacing: -0.025em;
  color: var(--c-warm);
}

.bk-h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 3.4vw, 36px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--c-warm);
}

.bk-h3 {
  font-size: 19px;
  font-weight: 600;
  line-height: 1.42;
  color: var(--c-warm);
}

.bk-kicker {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--c-orange);
}

/* 等宽数字层 */
.bk-num,
.bk-score,
.bk-tag,
.bk-panel-label,
.bk-panel-idx,
.bk-nav-idx,
.bk-crumbs,
.bk-foot-base,
.bk-foot-title,
.bk-foot-icp {
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

.bk-num {
  font-family: var(--font-mono);
  letter-spacing: -0.01em;
}

.bk-score {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(30px, 5vw, 52px);
  line-height: 1;
  letter-spacing: -0.03em;
}

.bk-score--live { color: var(--c-orange); }
.bk-score--final { color: var(--c-warm); }
.bk-score--upcoming { color: var(--c-muted); }

/* ---------- 4. 容器与网格 ---------- */
.bk-container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

@media (min-width: 768px) {
  .bk-container { padding: 0 40px; }
}

.bk-grid {
  display: grid;
  gap: 24px;
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 640px) {
  .bk-grid--2,
  .bk-grid--3,
  .bk-grid--4,
  .bk-grid--4-4-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .bk-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .bk-grid--4,
  .bk-grid--4-4-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .bk-grid--7-5 { grid-template-columns: 7fr 5fr; }
  .bk-grid--8-4 { grid-template-columns: 8fr 4fr; }
  .bk-grid--5-7 { grid-template-columns: 5fr 7fr; }
  .bk-grid--4-4-4 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

/* ---------- 5. 跳过链接 ---------- */
.bk-skip {
  position: fixed;
  top: -120px;
  left: 12px;
  z-index: 300;
  padding: 11px 18px;
  background: var(--c-orange);
  color: var(--c-night);
  font-weight: 800;
  font-size: 14px;
  letter-spacing: 0.06em;
  clip-path: polygon(0 0, 100% 0, 100% 70%, 88% 100%, 0 100%);
  transition: top 180ms ease;
}

.bk-skip:focus {
  top: 12px;
}

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

/* ---------- 6. 头部：快捷条 ---------- */
.bk-header {
  position: relative;
  z-index: 90;
}

.bk-quickbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 120;
  display: flex;
  align-items: center;
  gap: 16px;
  height: var(--quickbar-h);
  padding: 0 20px;
  background: rgba(7, 11, 18, 0.92);
  border-bottom: 1px solid var(--edge);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: left var(--dur) var(--ease);
}

@media (min-width: 1024px) {
  .bk-quickbar { left: var(--rail-w); }
}

.bk-live {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-orange);
  white-space: nowrap;
}

.bk-live-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-orange);
  animation: bk-breathe 2.4s ease-in-out infinite;
}

.bk-quick-sep {
  width: 1px;
  height: 18px;
  background: var(--edge);
}

.bk-clock {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-muted);
  white-space: nowrap;
}

.bk-clock-label {
  font-size: 10.5px;
  letter-spacing: 0.2em;
  color: var(--c-line);
}

.bk-clock .bk-num {
  font-size: 12px;
  color: var(--c-cyan);
}

.bk-quick-links {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
  overflow-x: auto;
  scrollbar-width: none;
}

.bk-quick-links::-webkit-scrollbar { display: none; }

.bk-quick-links a {
  display: inline-block;
  padding: 5px 11px;
  border: 1px solid transparent;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--c-muted);
  white-space: nowrap;
  transition: color var(--dur), border-color var(--dur);
}

.bk-quick-links a:hover {
  color: var(--c-cyan);
  border-color: var(--cyan-soft);
}

/* ---------- 7. 头部：框架导航 ---------- */
.bk-rail {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 130;
  height: var(--bar-mobile-h);
  overflow: hidden;
  background: var(--c-stand);
  border-top: 1px solid var(--edge);
  transition: height var(--dur) var(--ease);
}

html[data-nav-open="true"] .bk-rail {
  height: min(78vh, 560px);
  overflow-y: auto;
}

.bk-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 20px 20px;
  margin-bottom: 22px;
  border-bottom: 1px solid var(--edge);
}

.bk-brand-mark {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 42px;
  height: 42px;
  background: var(--c-orange);
  color: var(--c-night);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.04em;
  clip-path: polygon(0 0, 100% 0, 100% 72%, 72% 100%, 0 100%);
}

.bk-brand-text { display: block; min-width: 0; }

.bk-brand-name {
  display: block;
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--c-warm);
  white-space: nowrap;
}

.bk-brand-sub {
  display: block;
  margin-top: 2px;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-line);
  white-space: nowrap;
}

.bk-nav {
  flex: 1 1 auto;
  margin: 0;
}

.bk-nav-list {
  display: flex;
  flex-direction: row;
  height: var(--bar-mobile-h);
}

.bk-nav-list li {
  flex: 1 1 0;
  min-width: 0;
}

.bk-nav-list a {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  height: var(--bar-mobile-h);
  padding: 6px 2px;
  color: var(--c-muted);
  font-size: 10px;
  letter-spacing: 0;
  transition: color var(--dur), background var(--dur);
}

.bk-nav-list a::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  width: 22px;
  height: 2px;
  background: transparent;
  transform: translateX(-50%);
  transition: background var(--dur);
}

.bk-nav-list a:hover {
  color: var(--c-warm);
  background: rgba(35, 224, 200, 0.05);
}

.bk-nav-list a[aria-current="page"] {
  color: var(--c-warm);
  font-weight: 700;
}

.bk-nav-list a[aria-current="page"]::before {
  background: var(--c-orange);
}

.bk-nav-idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--c-line);
}

.bk-nav-list a[aria-current="page"] .bk-nav-idx {
  color: var(--c-orange);
}

.bk-nav-label {
  display: block;
  max-width: 100%;
  overflow: hidden;
  font-size: 10px;
  white-space: nowrap;
  text-overflow: ellipsis;
}

/* 移动端展开态 */
.bk-nav[data-open="true"] .bk-nav-list {
  flex-direction: column;
  height: auto;
  padding: 20px 16px 32px;
  gap: 2px;
}

.bk-nav[data-open="true"] .bk-nav-list li { flex: 0 0 auto; }

.bk-nav[data-open="true"] .bk-nav-list a {
  flex-direction: row;
  justify-content: flex-start;
  gap: 16px;
  height: auto;
  padding: 15px 16px;
  border-bottom: 1px solid var(--edge-soft);
  font-size: 17px;
  letter-spacing: 0.02em;
}

.bk-nav[data-open="true"] .bk-nav-list a::before {
  top: 50%;
  left: 0;
  width: 3px;
  height: 22px;
  transform: translateY(-50%);
}

.bk-nav[data-open="true"] .bk-nav-idx { font-size: 12px; }
.bk-nav[data-open="true"] .bk-nav-label { font-size: 17px; }

.bk-rail-toggle { display: none; }

.bk-rail-foot { display: none; }

/* ---------- 8. 头部：桌面框架 ---------- */
@media (min-width: 1024px) {
  .bk-rail {
    top: 0;
    right: auto;
    bottom: 0;
    width: var(--rail-w);
    height: auto;
    overflow: visible;
    display: flex;
    flex-direction: column;
    padding: 22px 0 18px;
    border-top: 0;
    border-right: 1px solid var(--edge);
    transition: width var(--dur) var(--ease);
  }

  .bk-brand { margin-bottom: 20px; }

  .bk-nav { overflow-y: auto; }

  .bk-nav-list {
    flex-direction: column;
    height: auto;
    gap: 2px;
  }

  .bk-nav-list li { flex: 0 0 auto; }

  .bk-nav-list a {
    flex-direction: row;
    justify-content: flex-start;
    gap: 12px;
    height: auto;
    padding: 12px 20px 12px 22px;
    font-size: 15px;
    letter-spacing: 0.02em;
  }

  .bk-nav-list a::before {
    top: 8px;
    left: 0;
    bottom: 8px;
    width: 3px;
    height: auto;
    transform: none;
  }

  .bk-nav-idx { min-width: 22px; font-size: 11px; }

  .bk-nav-label { font-size: 15px; }

  .bk-rail-toggle {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin: 14px 20px 12px;
    padding: 9px 12px;
    border: 1px solid var(--edge);
    font-size: 12px;
    letter-spacing: 0.08em;
    color: var(--c-muted);
    transition: color var(--dur), border-color var(--dur);
  }

  .bk-rail-toggle:hover {
    color: var(--c-cyan);
    border-color: var(--cyan-soft);
  }

  .bk-rail-toggle-icon {
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1;
  }

  .bk-rail-foot {
    display: block;
    margin-top: auto;
    padding: 16px 20px 0;
    border-top: 1px solid var(--edge);
  }

  .bk-rail-note {
    font-size: 12px;
    letter-spacing: 0.04em;
    color: var(--c-muted);
  }

  .bk-rail-icp {
    margin-top: 6px;
    font-family: var(--font-mono);
    font-size: 10.5px;
    letter-spacing: 0.04em;
    color: var(--c-line);
  }

  /* 折叠为图标轨道 */
  html[data-rail="collapsed"] .bk-brand {
    justify-content: center;
    padding: 0 0 20px;
  }

  html[data-rail="collapsed"] .bk-brand-text { display: none; }

  html[data-rail="collapsed"] .bk-nav-list a {
    justify-content: center;
    gap: 0;
    padding: 14px 0;
  }

  html[data-rail="collapsed"] .bk-nav-label { display: none; }

  html[data-rail="collapsed"] .bk-nav-idx { font-size: 12px; }

  html[data-rail="collapsed"] .bk-nav-list a::before { left: 0; }

  html[data-rail="collapsed"] .bk-rail-toggle {
    justify-content: center;
    margin: 14px 14px 12px;
    padding: 9px 0;
  }

  html[data-rail="collapsed"] .bk-rail-toggle-text { display: none; }

  html[data-rail="collapsed"] .bk-rail-foot { display: none; }
}

/* ---------- 9. 移动导航按钮 ---------- */
.bk-nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  padding: 8px 13px;
  border: 1px solid var(--edge-strong);
  color: var(--c-warm);
  font-size: 13px;
  letter-spacing: 0.06em;
  transition: border-color var(--dur), color var(--dur);
}

.bk-nav-toggle:hover {
  color: var(--c-cyan);
  border-color: var(--cyan-soft);
}

.bk-nav-toggle-icon {
  position: relative;
  display: block;
  width: 15px;
  height: 2px;
  background: currentColor;
}

.bk-nav-toggle-icon::before,
.bk-nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 15px;
  height: 2px;
  background: currentColor;
}

.bk-nav-toggle-icon::before { top: -5px; }
.bk-nav-toggle-icon::after { top: 5px; }

@media (max-width: 1023px) {
  .bk-brand,
  .bk-rail-foot,
  .bk-rail-toggle { display: none; }

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

  .bk-quick-links { margin-left: auto; }
}

@media (max-width: 767px) {
  .bk-live,
  .bk-quick-sep,
  .bk-quick-links { display: none; }

  .bk-clock { margin-left: 0; }
  .bk-clock .bk-num { font-size: 11.5px; }
  .bk-nav-toggle { margin-left: auto; }
}

/* ---------- 10. 页脚 ---------- */
.bk-footer {
  position: relative;
  margin-top: 80px;
  padding: 64px 0 30px;
  background: var(--c-night);
  border-top: 1px solid var(--edge);
  overflow: hidden;
}

.bk-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(120% 82% at 10% 0%, rgba(11, 46, 58, 0.6), rgba(11, 46, 58, 0) 62%),
    repeating-linear-gradient(-24deg, rgba(91, 107, 133, 0.055) 0 1px, rgba(91, 107, 133, 0) 1px 48px);
}

.bk-footer-inner {
  position: relative;
  z-index: 1;
}

.bk-foot-grid {
  display: grid;
  gap: 40px 32px;
  grid-template-columns: minmax(0, 1fr);
  padding-bottom: 46px;
  border-bottom: 1px solid var(--edge);
}

@media (min-width: 640px) {
  .bk-foot-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .bk-foot-grid { grid-template-columns: 1.4fr 0.9fr 1.3fr 1fr; }
}

.bk-foot-block { min-width: 0; }

.bk-foot-brandname {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--c-warm);
}

.bk-foot-tag {
  margin-top: 14px;
  max-width: 32ch;
  font-size: 14px;
  line-height: 1.78;
  color: var(--c-muted);
}

.bk-foot-since {
  margin-top: 14px;
  padding-left: 12px;
  border-left: 2px solid var(--c-orange);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--c-line);
}

.bk-foot-title {
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.bk-foot-title--gap { margin-top: 30px; }

.bk-foot-links li + li { margin-top: 10px; }

.bk-foot-links a {
  display: inline-block;
  font-size: 14px;
  color: var(--c-muted);
  transition: color var(--dur), transform var(--dur);
}

.bk-foot-links a:hover {
  color: var(--c-orange);
  transform: translateX(3px);
}

.bk-foot-meta-list li {
  display: flex;
  gap: 10px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--c-muted);
  word-break: break-word;
}

.bk-foot-meta-list li + li { margin-top: 9px; }

.bk-foot-key {
  flex: 0 0 34px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--c-line);
  padding-top: 2px;
}

.bk-foot-note {
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--c-muted);
}

.bk-foot-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  padding-top: 24px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--c-line);
}

.bk-foot-icp { color: var(--c-muted); }

.bk-foot-domain { color: var(--c-line); }

/* ---------- 11. 返回顶部 ---------- */
.bk-to-top {
  position: fixed;
  right: 20px;
  bottom: 22px;
  z-index: 140;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 20px;
  padding: 10px 15px;
  background: var(--c-stand);
  border: 1px solid var(--edge-strong);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-muted);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--dur), transform var(--dur), visibility var(--dur), color var(--dur), border-color var(--dur);
}

.bk-to-top[data-visible="true"] {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.bk-to-top:hover {
  color: var(--c-cyan);
  border-color: var(--cyan-soft);
}

.bk-to-top-arrow {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1;
}

@media (max-width: 1023px) {
  .bk-to-top { bottom: calc(var(--bar-mobile-h) + 16px); }
}

/* ---------- 12. 切角面板 ---------- */
.bk-panel {
  position: relative;
  padding: 32px 28px;
  background: var(--c-panel);
  border: 1px solid var(--edge);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

@media (min-width: 768px) {
  .bk-panel { padding: 40px 40px; }
}

.bk-panel-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 26px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--edge);
}

.bk-panel-label {
  display: inline-block;
  padding: 4px 10px;
  background: var(--c-cyan);
  color: var(--c-night);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.bk-panel-idx {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-line);
}

/* ---------- 13. 档案卡 ---------- */
.bk-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 20px;
  background: var(--c-stand);
  border: 1px solid var(--edge);
  transition: border-color var(--dur), background var(--dur), transform var(--dur);
}

.bk-card:hover {
  background: #111C30;
  border-color: rgba(35, 224, 200, 0.38);
  transform: translateY(-2px);
}

.bk-card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.bk-card__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.bk-card__team {
  font-size: 15px;
  font-weight: 600;
  color: var(--c-warm);
  min-width: 0;
}

.bk-card__bar {
  height: 3px;
  background: linear-gradient(90deg, var(--c-cyan), rgba(35, 224, 200, 0));
}

.bk-card__foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--c-line);
}

.bk-card[data-pinned] {
  border-color: var(--c-cyan);
  box-shadow: inset 0 0 0 1px rgba(35, 224, 200, 0.32);
}

/* ---------- 14. 状态标签 ---------- */
.bk-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 1px solid var(--edge-strong);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--c-muted);
  white-space: nowrap;
}

.bk-tag--live {
  color: var(--c-orange);
  border-color: var(--orange-soft);
}

.bk-tag--live::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-orange);
  animation: bk-breathe 2.4s ease-in-out infinite;
}

.bk-tag--data {
  color: var(--c-cyan);
  border-color: var(--cyan-soft);
}

.bk-tag--pending {
  color: var(--c-amber);
  border-color: var(--amber-soft);
}

@keyframes bk-breathe {
  0%, 100% { opacity: 0.36; }
  50% { opacity: 1; }
}

/* ---------- 15. 按钮 ---------- */
.bk-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 24px;
  border: 1px solid var(--edge-strong);
  background: transparent;
  color: var(--c-warm);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
  transition: background var(--dur), color var(--dur), border-color var(--dur);
}

.bk-btn:hover {
  background: rgba(35, 224, 200, 0.1);
  border-color: var(--c-cyan);
  color: var(--c-cyan);
}

.bk-btn--primary {
  background: var(--c-orange);
  border-color: var(--c-orange);
  color: var(--c-night);
}

.bk-btn--primary:hover {
  background: #FF8340;
  border-color: #FF8340;
  color: var(--c-night);
}

/* ---------- 16. 面包屑 ---------- */
.bk-crumbs {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--c-line);
}

.bk-crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.bk-crumbs li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.bk-crumbs li + li::before {
  content: "/";
  color: var(--c-line);
}

.bk-crumbs a {
  color: var(--c-muted);
  transition: color var(--dur);
}

.bk-crumbs a:hover { color: var(--c-cyan); }

/* ---------- 17. 正文容器 ---------- */
.bk-prose {
  max-width: 68ch;
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--c-muted);
}

.bk-prose p + p { margin-top: 1.15em; }

.bk-prose strong {
  color: var(--c-warm);
  font-weight: 700;
}

.bk-prose a {
  color: var(--c-cyan);
  border-bottom: 1px solid var(--cyan-soft);
}

.bk-prose ul,
.bk-prose ol {
  margin: 1.1em 0;
  padding-left: 1.2em;
}

.bk-prose ul li { list-style: none; position: relative; }
.bk-prose ul li::before {
  content: "";
  position: absolute;
  left: -1em;
  top: 0.72em;
  width: 8px;
  height: 2px;
  background: var(--c-orange);
}
.bk-prose ol { list-style: decimal; }
.bk-prose li + li { margin-top: 0.5em; }

/* ---------- 18. 媒体容器 ---------- */
.bk-media {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: linear-gradient(155deg, var(--c-panel) 0%, var(--c-deep) 56%, var(--c-night) 100%);
}

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

.bk-media > img,
.bk-media > svg,
.bk-media > video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.bk-media--scrim::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(0deg, rgba(7, 11, 18, 0.74), rgba(7, 11, 18, 0) 58%);
}

.bk-media-caption {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.05em;
  line-height: 1.7;
  color: var(--c-line);
}

/* ---------- 19. 标签页 ---------- */
.bk-tabs {
  display: flex;
  gap: 4px;
  border-bottom: 1px solid var(--edge);
  overflow-x: auto;
  scrollbar-width: none;
}

.bk-tabs::-webkit-scrollbar { display: none; }

.bk-tab {
  padding: 12px 18px;
  border-bottom: 2px solid transparent;
  color: var(--c-muted);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
  white-space: nowrap;
  transition: color var(--dur), border-color var(--dur);
}

.bk-tab:hover { color: var(--c-warm); }

.bk-tab[aria-selected="true"] {
  color: var(--c-orange);
  border-bottom-color: var(--c-orange);
}

.bk-tabpanel { padding-top: 24px; }

.bk-tabpanel[hidden] { display: none; }

/* ---------- 20. 折叠面板 ---------- */
.bk-fold {
  border: 1px solid var(--edge);
  background: var(--c-stand);
}

.bk-fold + .bk-fold { margin-top: -1px; }

.bk-fold__head {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 16px 20px;
  text-align: left;
  font-size: 16px;
  font-weight: 600;
  color: var(--c-warm);
  transition: color var(--dur), background var(--dur);
}

.bk-fold__head:hover {
  color: var(--c-cyan);
  background: rgba(35, 224, 200, 0.05);
}

.bk-fold__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--c-cyan);
}

.bk-fold[data-open="true"] .bk-fold__head::after { content: "−"; }

.bk-fold__body {
  padding: 0 20px 20px;
  font-size: 15px;
  line-height: 1.82;
  color: var(--c-muted);
}

.bk-fold:not([data-open="true"]) .bk-fold__body { display: none; }

/* ---------- 21. 章节目录跟随 ---------- */
.bk-toc {
  position: sticky;
  top: calc(var(--quickbar-h) + 26px);
  align-self: start;
  padding-left: 18px;
  border-left: 1px solid var(--edge);
}

.bk-toc__title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.bk-toc a {
  display: block;
  padding: 7px 0;
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--c-muted);
  transition: color var(--dur), transform var(--dur);
}

.bk-toc a:hover { color: var(--c-warm); transform: translateX(3px); }

.bk-toc a[aria-current="true"] {
  color: var(--c-orange);
  font-weight: 700;
}

/* ---------- 22. 揭示动画 ---------- */
.bk-reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 520ms var(--ease), transform 520ms var(--ease);
}

.bk-reveal.is-in {
  opacity: 1;
  transform: none;
}

/* ---------- 23. 降低动态 ---------- */
@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;
  }

  .bk-reveal {
    opacity: 1;
    transform: none;
  }
}