/* ==========================================================================
   红蓝电竞 · 官方中文站 — 共享样式 /assets/site.css
   框架式导航 + 左右分屏 + 矿物暗色体系
   ========================================================================== */

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

:root {
  --ink: #0E1116;
  --ink-2: #171D26;
  --blue: #2748E0;
  --blue-deep: #152A6B;
  --red: #E4362F;
  --cyan: #4FE3D8;
  --cream: #EDE7DC;
  --muted: #9AA6B8;
  --moss: #7C8C6A;
  --clay: #B5714F;
  --line: #2A323D;
  --rail-w: clamp(228px, 19vw, 288px);
  --strip-h: 56px;
  --container: 1280px;
  --radius: 2px;
  --ease: cubic-bezier(.2, .7, .3, 1);
  --font-display: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-data: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", "Courier New", monospace;
}

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

body {
  margin: 0;
  padding-top: var(--strip-h);
  background: var(--ink);
  color: var(--cream);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg, video { max-width: 100%; }
img { height: auto; }

h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.24;
  margin: 0 0 .6em;
  color: var(--cream);
}
h1 { font-size: clamp(2.1rem, 4.6vw, 4.2rem); }
h2 { font-size: clamp(1.6rem, 2.6vw, 2.4rem); }
h3 { font-size: clamp(1.15rem, 1.7vw, 1.5rem); }
h4 { font-size: 1.05rem; letter-spacing: 0; }
p { margin: 0 0 1.2em; }
a { color: var(--cream); text-underline-offset: 3px; }
strong { font-weight: 700; }

::selection { background: var(--red); color: #fff; }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; }
:focus:not(:focus-visible) { outline: none; }
#main-content:focus { outline: none; }

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

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(18px, 3.4vw, 44px);
}

.mono, .data-num { font-family: var(--font-data); font-variant-numeric: tabular-nums; }
.data-num { letter-spacing: .02em; }
.muted { color: var(--muted); }

/* --------------------------------------------------------- 跳过链接 */
.skip-link {
  position: absolute;
  left: 10px; top: 10px;
  z-index: 200;
  transform: translateY(-180%);
  padding: 10px 16px;
  background: var(--cyan);
  color: #06201e;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 14px;
  text-decoration: none;
  border-radius: var(--radius);
  transition: transform 160ms var(--ease);
}
.skip-link:focus { transform: translateY(0); }

/* --------------------------------------------------------- 页头外壳 */
.site-header { position: relative; z-index: 60; }

/* 左侧框架竖栏 */
.frame-rail {
  position: fixed;
  top: 0; bottom: 0; left: 0;
  width: var(--rail-w);
  z-index: 90;
  display: flex;
  flex-direction: column;
  gap: 22px;
  padding: 22px 20px 20px;
  background:
    linear-gradient(180deg, rgba(39, 72, 224, .16) 0%, rgba(14, 17, 22, 0) 44%),
    var(--ink-2);
  border-right: 1px solid var(--line);
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}
.frame-rail::after {
  content: "";
  position: absolute;
  top: 0; right: -1px;
  width: 2px; height: 132px;
  background: linear-gradient(180deg, var(--red), rgba(228, 54, 47, 0));
}

.rail-brand {
  position: relative;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  grid-template-rows: auto auto;
  column-gap: 12px;
  align-items: center;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}
.brand-mark {
  grid-row: 1 / span 2;
  width: 44px; height: 44px;
  display: grid;
  place-items: center;
  font-family: var(--font-data);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: -.04em;
  color: #fff;
  background: linear-gradient(135deg, var(--red) 0 50%, var(--blue) 50% 100%);
  clip-path: polygon(0 0, 100% 0, 100% 68%, 68% 100%, 0 100%);
}
.brand-name {
  align-self: end;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16px;
  letter-spacing: .02em;
  line-height: 1.3;
}
.brand-tag {
  align-self: start;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: .05em;
  color: var(--muted);
  line-height: 1.5;
}

.rail-nav { flex: 1 1 auto; }

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.nav-link {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  align-items: center;
  gap: 10px;
  padding: 11px 10px 11px 12px;
  border-left: 2px solid transparent;
  color: var(--muted);
  font-size: 15px;
  text-decoration: none;
  transition: color 120ms var(--ease), background 120ms var(--ease), border-color 120ms var(--ease);
}
.nav-link:hover {
  color: var(--cream);
  background: rgba(39, 72, 224, .14);
  border-left-color: var(--blue);
}
.nav-link[aria-current="page"] {
  color: var(--cream);
  border-left-color: var(--red);
  background: linear-gradient(90deg, rgba(228, 54, 47, .18), rgba(228, 54, 47, 0) 72%);
}
.nav-code {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
}
.nav-link[aria-current="page"] .nav-code { color: var(--red); }
.nav-label { font-weight: 500; }

.rail-foot {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}
.rail-note {
  margin: 0;
  font-family: var(--font-data);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .03em;
  color: var(--muted);
}

/* 顶部细分隔条 */
.frame-strip {
  position: fixed;
  top: 0; left: var(--rail-w); right: 0;
  height: var(--strip-h);
  z-index: 85;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 0 clamp(14px, 2vw, 22px);
  background: rgba(14, 17, 22, .94);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.strip-title {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.strip-rule {
  flex: 1 1 auto;
  min-width: 24px;
  height: 1px;
  background: linear-gradient(90deg, rgba(42, 50, 61, 0), var(--line) 14%, var(--line) 86%, rgba(42, 50, 61, 0));
}
.strip-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
  white-space: nowrap;
}
.dot-live {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(79, 227, 216, .16);
  animation: pulse-dot 2.4s var(--ease) infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: .32; }
}

.scroll-progress {
  position: absolute;
  left: 0; right: 0; bottom: -1px;
  display: block;
  height: 2px;
  background: rgba(39, 72, 224, .18);
  pointer-events: none;
}
.scroll-progress > span {
  display: block;
  width: 100%; height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--blue), var(--red));
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  width: 38px; height: 34px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--cream);
  cursor: pointer;
  transition: border-color 120ms var(--ease), color 120ms var(--ease);
}
.nav-toggle:hover { border-color: var(--blue); color: #fff; }
.nav-toggle-bars { position: relative; display: block; width: 16px; height: 10px; }
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0; right: 0;
  height: 1.5px;
  background: currentColor;
  transition: transform 160ms var(--ease);
}
.nav-toggle-bars::before { top: 0; }
.nav-toggle-bars::after { bottom: 0; }
.nav-toggle-bars > span {
  position: absolute;
  left: 0; right: 0; top: 50%;
  height: 1.5px;
  background: currentColor;
  transform: translateY(-50%);
  transition: opacity 160ms var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { transform: translateY(4.25px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { transform: translateY(-4.25px) rotate(-45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars > span { opacity: 0; }

/* 移动抽屉遮罩 */
.rail-scrim {
  position: fixed;
  inset: 0;
  z-index: 88;
  background: rgba(6, 8, 12, .74);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 240ms var(--ease), visibility 240ms linear;
}
.rail-scrim.is-on { opacity: 1; visibility: visible; pointer-events: auto; }

/* --------------------------------------------------------- 页脚 */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 9vw, 120px);
  background: linear-gradient(180deg, var(--blue-deep) 0%, #101827 46%, var(--ink) 100%);
  border-top: 1px solid var(--line);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--red) 0 18%, var(--blue) 18% 100%);
}
.site-footer::after {
  content: "";
  position: absolute;
  top: 0; right: 0;
  width: min(240px, 40%);
  height: 140px;
  background: repeating-linear-gradient(135deg, rgba(237, 231, 220, .07) 0 1px, rgba(237, 231, 220, 0) 1px 9px);
  pointer-events: none;
}
.site-footer > * { position: relative; z-index: 1; }

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 2fr) minmax(0, 1.25fr);
  gap: clamp(24px, 4vw, 56px);
  padding-block: clamp(38px, 6vw, 74px) 44px;
}
.footer-sign {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  letter-spacing: -.01em;
  line-height: 1.35;
}
.footer-desc {
  max-width: 34ch;
  margin: 0 0 20px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}
.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}
.footer-col-title {
  position: relative;
  margin: 0 0 16px;
  padding-bottom: 10px;
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .14em;
  color: var(--cream);
}
.footer-col-title::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 22px; height: 2px;
  background: var(--red);
}
.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 9px;
}
.footer-link {
  display: inline-block;
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 120ms var(--ease), border-color 120ms var(--ease);
}
.footer-link:hover { color: var(--cream); border-bottom-color: var(--cyan); }

.footer-contact { min-width: 0; }
.contact-list {
  list-style: none;
  margin: 0 0 14px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.contact-item { display: flex; flex-direction: column; gap: 5px; }
.contact-key {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--muted);
}
.contact-value {
  font-family: var(--font-data);
  font-size: 13px;
  line-height: 1.7;
  color: var(--cream);
  word-break: break-word;
}
.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  max-width: 100%;
  padding: 7px 10px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--cream);
  font-family: var(--font-data);
  font-size: 12px;
  text-align: left;
  cursor: pointer;
  transition: border-color 120ms var(--ease), background 120ms var(--ease);
}
.copy-btn:hover { border-color: var(--cyan); background: rgba(79, 227, 216, .08); }
.copy-btn.is-copied { border-color: var(--cyan); }
.copy-value { word-break: break-all; }
.copy-hint {
  flex: 0 0 auto;
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--muted);
}
.copy-btn.is-copied .copy-hint { color: var(--cyan); }
.footer-note {
  margin: 0;
  font-size: 12px;
  line-height: 1.8;
  color: var(--muted);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 28px;
  padding-block: 20px 30px;
  border-top: 1px solid rgba(237, 231, 220, .12);
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--muted);
}
.footer-legal, .footer-meta { margin: 0; }

/* --------------------------------------------------------- 通用按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: transform 120ms var(--ease), background 120ms var(--ease), border-color 120ms var(--ease), color 120ms var(--ease);
}
.btn-primary {
  background: var(--red);
  border-left: 3px solid rgba(255, 255, 255, .38);
  color: #fff;
}
.btn-primary:hover { background: #f0463e; transform: translateY(-2px); }
.btn-ghost {
  background: rgba(237, 231, 220, .04);
  border-color: var(--line);
  color: var(--cream);
}
.btn-ghost:hover { border-color: var(--cyan); color: var(--cyan); transform: translateY(-2px); }
.btn-sm { padding: 9px 14px; font-size: 13px; }

/* --------------------------------------------------------- 面包屑 */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
}
.breadcrumb-item { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumb-item a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 120ms var(--ease), border-color 120ms var(--ease);
}
.breadcrumb-item a:hover { color: var(--cream); border-bottom-color: var(--cyan); }
.breadcrumb-item[aria-current="page"] { color: var(--cream); }
.breadcrumb-sep { color: #3B4552; }

/* --------------------------------------------------------- 正文容器 */
.prose { max-width: 68ch; line-height: 1.85; }
.prose > p { margin: 0 0 1.2em; }
.prose h2 { margin-top: 1.8em; }
.prose h3 { margin-top: 1.5em; }
.prose ul, .prose ol { margin: 0 0 1.2em; padding-left: 1.3em; }
.prose li { margin-bottom: .45em; }
.prose li::marker { color: var(--red); }
.prose blockquote {
  margin: 0 0 1.2em;
  padding: 12px 0 12px 18px;
  border-left: 3px solid var(--blue);
  color: var(--muted);
}
.prose code {
  font-family: var(--font-data);
  font-size: .92em;
  padding: 2px 6px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.prose hr { height: 1px; border: 0; background: var(--line); margin: 2em 0; }

.lead {
  max-width: 60ch;
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  line-height: 1.9;
  color: #CFD5DE;
}

/* --------------------------------------------------------- 区块与网格 */
.section { padding-block: clamp(36px, 6vw, 84px); }
.section-head { margin-bottom: clamp(20px, 3vw, 36px); }
.section-title { margin: 0 0 .35em; }
.section-note {
  max-width: 60ch;
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 12px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--red);
}
.eyebrow::before {
  content: "";
  width: 14px; height: 2px;
  background: var(--red);
}

.grid { display: grid; gap: clamp(16px, 2vw, 26px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid--split { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
.grid--wide { grid-template-columns: minmax(0, 8fr) minmax(0, 4fr); }
.grid--aside { grid-template-columns: minmax(0, 3fr) minmax(200px, 1fr); }

.divider {
  height: 1px;
  border: 0;
  margin: clamp(28px, 5vw, 56px) 0;
  background: linear-gradient(90deg, var(--line), rgba(42, 50, 61, 0));
}

/* --------------------------------------------------------- 卡片与展签 */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(18px, 2vw, 26px);
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 1px 0 rgba(255, 255, 255, .02), 0 14px 32px -26px rgba(0, 0, 0, .95);
  transition: transform 120ms var(--ease), border-color 120ms var(--ease);
}
.card::after {
  content: "";
  position: absolute;
  left: 0; bottom: -1px;
  width: 0; height: 2px;
  background: var(--red);
  transition: width 240ms var(--ease);
}
.card:hover { transform: translateY(-2px); border-color: rgba(39, 72, 224, .7); }
.card:hover::after { width: 56px; }
.card-title { margin: 0; font-size: clamp(1.05rem, 1.5vw, 1.3rem); }
.card-meta {
  margin: 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
}
.card-body { margin: 0; font-size: 14.5px; line-height: 1.85; color: #C6CDD8; }
.card-foot {
  margin-top: auto;
  padding-top: 8px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  align-items: center;
}

.panel {
  padding: clamp(18px, 2.4vw, 30px);
  background: linear-gradient(160deg, rgba(39, 72, 224, .18), rgba(21, 42, 107, .32));
  border: 1px solid rgba(39, 72, 224, .42);
  border-radius: var(--radius);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .06em;
  line-height: 1.6;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--muted);
}
.tag--red { color: #F2776F; border-color: rgba(228, 54, 47, .5); background: rgba(228, 54, 47, .12); }
.tag--blue { color: #97A9FF; border-color: rgba(39, 72, 224, .55); background: rgba(39, 72, 224, .16); }
.tag--cyan { color: var(--cyan); border-color: rgba(79, 227, 216, .45); background: rgba(79, 227, 216, .1); }
.tag--moss { color: #A5B58F; border-color: rgba(124, 140, 106, .55); background: rgba(124, 140, 106, .14); }
.tag--clay { color: #D3936F; border-color: rgba(181, 113, 79, .55); background: rgba(181, 113, 79, .14); }

/* --------------------------------------------------------- 数据块 */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px clamp(14px, 1.6vw, 22px);
  background: var(--ink-2);
}
.stat-value {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--cream);
}
.stat-value.is-hot { color: var(--red); }
.stat-label {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--muted);
}

/* --------------------------------------------------------- 图片容器 */
.media {
  position: relative;
  overflow: hidden;
  display: block;
  width: 100%;
  background: linear-gradient(135deg, #1B2430, #10151D);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.media img { display: block; width: 100%; height: 100%; object-fit: cover; }
.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--square { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 3 / 4; }
.media-caption {
  display: block;
  margin-top: 8px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--muted);
}
.media-frame {
  position: relative;
  padding: 6px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.media-frame::before {
  content: "";
  position: absolute;
  top: -1px; left: -1px;
  width: 30px; height: 30px;
  border-top: 2px solid var(--red);
  border-left: 2px solid var(--red);
  pointer-events: none;
}

/* --------------------------------------------------------- 主题筛选 */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-bottom: 4px;
}
.filter-btn {
  padding: 7px 12px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--muted);
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .08em;
  cursor: pointer;
  transition: color 120ms var(--ease), border-color 120ms var(--ease), background 120ms var(--ease);
}
.filter-btn:hover {
  color: var(--cream);
  border-color: var(--blue);
  background: rgba(39, 72, 224, .14);
}
.filter-btn.is-active {
  color: #fff;
  background: var(--blue);
  border-color: var(--blue);
}
[data-tags][hidden] { display: none; }
.is-enter { animation: filter-in 180ms var(--ease) both; }
@keyframes filter-in {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: none; }
}

/* --------------------------------------------------------- 显现动效 */
html.js-ready [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 420ms var(--ease), transform 420ms var(--ease);
}
html.js-ready [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* --------------------------------------------------------- 响应式 */
@media (max-width: 1023px) {
  .frame-strip { left: 0; }
  .nav-toggle { display: inline-flex; }
  .strip-title { flex: 1 1 auto; }
  .strip-rule { display: none; }

  .frame-rail {
    top: var(--strip-h);
    width: min(88vw, 330px);
    z-index: 95;
    transform: translateX(-103%);
    transition: transform 240ms var(--ease);
  }
  .frame-rail[data-open] {
    transform: translateX(0);
    box-shadow: 0 0 0 1px rgba(39, 72, 224, .5), 30px 0 60px -34px rgba(0, 0, 0, .95);
  }

  .footer-top { grid-template-columns: minmax(0, 1fr); }
  .grid--4, .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--split, .grid--wide, .grid--aside { grid-template-columns: minmax(0, 1fr); }
}

@media (min-width: 1024px) {
  body { padding-left: var(--rail-w); }
  .rail-scrim { display: none; }
  .frame-rail { transform: none; }
}

@media (max-width: 640px) {
  :root { --strip-h: 52px; }
  .strip-status { display: none; }
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px 18px; }
  .grid--2, .grid--3, .grid--4 { grid-template-columns: minmax(0, 1fr); }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  html.js-ready [data-reveal] { opacity: 1; transform: none; }
  .frame-rail { transition: none; }
  .is-enter { animation: none; }
}