/* ============================================================
   博万游艺 · 全站共享样式 /assets/site.css
   夜间指挥舱：墨黑底 + 坐标线 + 琥珀金决策路径 + 电光青连线
   ============================================================ */

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

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

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

ul, ol { padding: 0; list-style: none; }

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

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

a { color: inherit; }

:where(h1, h2, h3, h4) { line-height: 1.12; font-weight: 900; letter-spacing: -0.025em; }

/* ---------- 2. Tokens ---------- */
:root {
  --ink: #0A0C10;
  --ink-2: #11151C;
  --ink-3: #1A202B;
  --amber: #F2A93B;
  --amber-soft: #FFD27A;
  --cyan: #28E0D0;
  --rose: #F04E8A;
  --paper: #F5F1E8;
  --mist: #8C96A8;
  --text: #E8E4DA;

  --line: rgba(140, 150, 168, 0.20);
  --line-strong: rgba(140, 150, 168, 0.38);

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC", "Noto Sans SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  --rail-w: 252px;
  --r-lg: 26px;
  --r-md: 16px;
  --r-sm: 10px;

  --pad-x: clamp(1.1rem, 3.4vw, 2.75rem);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

@media (max-width: 1199px) {
  :root { --rail-w: 224px; }
}

@media (max-width: 899px) {
  :root { --rail-w: 0px; }
}

/* ---------- 3. Base ---------- */
body {
  min-height: 100vh;
  padding-left: var(--rail-w);
  background:
    radial-gradient(920px 540px at 78% -10%, rgba(40, 224, 208, 0.10), transparent 62%),
    radial-gradient(780px 500px at 4% 14%, rgba(242, 169, 59, 0.09), transparent 64%),
    var(--ink);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

@media (max-width: 899px) {
  body {
    padding-left: 0;
    padding-bottom: 5.6rem;
  }
}

:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
  border-radius: 4px;
}

.mono { font-family: var(--font-mono); }

/* ---------- 4. Skip link ---------- */
.skip-link {
  position: fixed;
  top: 0.75rem;
  left: calc(var(--rail-w) + 0.85rem);
  z-index: 400;
  padding: 0.6rem 1.15rem;
  border-radius: var(--r-sm) var(--r-sm) var(--r-sm) 2px;
  background: linear-gradient(100deg, var(--amber-soft), var(--amber));
  color: #120C02;
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-decoration: none;
  transform: translateY(-220%);
  transition: transform 0.2s var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
  outline: 2px solid var(--paper);
  outline-offset: 3px;
}

/* ---------- 5. Header / 左侧轨道 ---------- */
.site-header {
  position: fixed;
  inset: 0 auto 0 0;
  z-index: 120;
  width: var(--rail-w);
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 1.1rem 0 1rem;
  background: linear-gradient(180deg, #0C1017 0%, #0A0C10 48%, #0B0E14 100%);
  border-right: 1px solid var(--line);
  overflow-y: auto;
  overscroll-behavior: contain;
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(to bottom, rgba(140, 150, 168, 0.09) 0 1px, transparent 1px 58px);
  opacity: 0.75;
}

/* 顶部：品牌署名 + 菜单按钮 */
.rail-top {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  padding: 0 0.85rem 0.95rem;
  margin-bottom: 0.55rem;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  min-width: 0;
  text-decoration: none;
}

.brand-mark {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 2.35rem;
  height: 2.35rem;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: #0B0E14;
  background: linear-gradient(140deg, var(--amber-soft), var(--amber));
  border-radius: 42% 58% 46% 54% / 52% 44% 56% 48%;
  box-shadow: 0 0 0 1px rgba(242, 169, 59, 0.45), 0 12px 26px -16px rgba(242, 169, 59, 0.95);
  transition: border-radius 0.4s var(--ease), transform 0.25s var(--ease);
}

.brand:hover .brand-mark {
  border-radius: 50% 50% 50% 50% / 50% 50% 50% 50%;
  transform: translateY(-1px);
}

.brand-word {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.brand-name {
  font-size: 1rem;
  font-weight: 900;
  letter-spacing: 0.05em;
  line-height: 1.25;
  color: var(--paper);
}

.brand-tag {
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  line-height: 1.4;
  color: var(--mist);
  white-space: nowrap;
}

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.55rem;
  padding: 0.5rem 0.85rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: rgba(26, 32, 43, 0.72);
  color: var(--text);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}

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

.nav-toggle-label { line-height: 1; }

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: background 0.2s var(--ease);
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: top 0.22s var(--ease), transform 0.22s var(--ease);
}

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

.site-header[data-open] .nav-toggle-bars { background: transparent; }
.site-header[data-open] .nav-toggle-bars::before { top: 0; transform: rotate(45deg); }
.site-header[data-open] .nav-toggle-bars::after { top: 0; transform: rotate(-45deg); }

/* 栏目索引读数 */
.rail-readout {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin: 0 0.85rem 0.7rem;
  padding: 0.42rem 0.62rem;
  border: 1px dashed var(--line-strong);
  border-radius: var(--r-sm);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.rail-readout-key { line-height: 1.4; }

.rail-readout-val {
  margin-left: auto;
  font-size: 0.92rem;
  letter-spacing: 0.05em;
  color: var(--amber);
  line-height: 1;
}

/* 导航 */
.rail-nav {
  position: relative;
  z-index: 1;
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  padding: 0 0.5rem 0.4rem;
}

.rail-list {
  display: flex;
  flex-direction: column;
  gap: 0.14rem;
}

.rail-item { display: block; }

.rail-link {
  position: relative;
  display: grid;
  grid-template-columns: 2.2rem minmax(0, 1fr);
  align-items: center;
  gap: 0.55rem;
  padding: 0.6rem 0.5rem 0.6rem 0.75rem;
  border-left: 2px solid transparent;
  border-radius: 8px 14px 14px 8px;
  color: var(--mist);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-decoration: none;
  transition: color 0.18s var(--ease), background 0.18s var(--ease), border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.rail-num {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: rgba(140, 150, 168, 0.78);
  transition: color 0.18s var(--ease);
}

.rail-text { min-width: 0; }

.rail-link:hover {
  color: var(--paper);
  background: rgba(40, 224, 208, 0.08);
  border-left-color: rgba(40, 224, 208, 0.55);
  transform: translateX(2px);
}

.rail-link:hover .rail-num { color: var(--cyan); }

.rail-link[aria-current="page"] {
  color: #0B0E14;
  background: linear-gradient(100deg, var(--amber-soft), var(--amber) 78%);
  border-left-color: var(--rose);
  box-shadow: 0 14px 30px -20px rgba(242, 169, 59, 0.95);
  transform: none;
}

.rail-link[aria-current="page"] .rail-num { color: rgba(11, 14, 20, 0.72); }

.rail-link[aria-current="page"]:focus-visible {
  outline-color: var(--rose);
  outline-offset: 2px;
}

/* 轨道底部 */
.rail-foot {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  padding: 1rem 0.45rem 0;
  border-top: 1px solid var(--line);
}

.rail-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.66rem 0.8rem;
  border: 1px solid rgba(40, 224, 208, 0.42);
  border-radius: 14px 5px 14px 5px;
  background: linear-gradient(120deg, rgba(40, 224, 208, 0.16), rgba(40, 224, 208, 0.04));
  color: var(--cyan);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-decoration: none;
  transition: transform 0.2s var(--ease), background 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.rail-cta::after {
  content: "→";
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1;
}

.rail-cta:hover {
  transform: translateY(-2px);
  background: linear-gradient(120deg, rgba(40, 224, 208, 0.30), rgba(40, 224, 208, 0.10));
  box-shadow: 0 16px 30px -22px rgba(40, 224, 208, 0.95);
}

.rail-meta {
  display: flex;
  flex-direction: column;
  gap: 0.08rem;
  font-size: 0.72rem;
  line-height: 1.6;
  color: var(--mist);
}

.rail-meta-k {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  color: rgba(140, 150, 168, 0.7);
}

.rail-mail { color: var(--text); word-break: break-all; }

/* ---------- 6. 移动端：底部抽屉 ---------- */
@media (max-width: 899px) {
  .site-header {
    inset: auto 0 0 0;
    width: 100%;
    padding: 0.5rem 0.85rem calc(0.55rem + env(safe-area-inset-bottom));
    gap: 0;
    background: rgba(10, 12, 16, 0.95);
    border-right: 0;
    border-top: 1px solid var(--line-strong);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    overflow: visible;
  }

  .site-header::before { display: none; }

  .rail-top {
    padding: 0.25rem 0;
    margin-bottom: 0;
    border-bottom: 0;
  }

  .rail-readout { display: none; }

  .nav-toggle { display: flex; }

  .rail-nav {
    flex: 0 0 auto;
    max-height: 0;
    overflow: hidden;
    padding: 0;
    transition: max-height 0.34s var(--ease);
  }

  .site-header[data-open] .rail-nav {
    max-height: min(70vh, 30rem);
    overflow-y: auto;
    padding-bottom: 0.45rem;
  }

  .rail-list { padding-top: 0.45rem; }

  .rail-link {
    grid-template-columns: 2rem minmax(0, 1fr);
    font-size: 0.92rem;
  }

  .rail-link[aria-current="page"] { transform: none; }

  .rail-foot {
    margin-top: 0.6rem;
    padding: 0.85rem 0.45rem 0;
  }
}

/* ---------- 7. Footer ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(3rem, 8vw, 6rem);
  padding: clamp(2.4rem, 6vw, 4rem) 0 1.5rem;
  background: linear-gradient(180deg, rgba(17, 21, 28, 0.55), #070910 72%);
  border-top: 1px solid var(--line);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(to right, rgba(140, 150, 168, 0.075) 0 1px, transparent 1px 96px);
  opacity: 0.8;
}

.site-footer::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: min(38%, 420px);
  height: 1px;
  background: linear-gradient(90deg, var(--amber), transparent);
}

.foot-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(220px, 1.55fr) repeat(3, minmax(140px, 1fr));
  gap: clamp(1.6rem, 3.4vw, 3rem);
}

.foot-brand { display: flex; flex-direction: column; gap: 1rem; }

.foot-note {
  max-width: 34ch;
  font-size: 0.86rem;
  line-height: 1.85;
  color: var(--mist);
}

.foot-col { display: flex; flex-direction: column; }

.foot-title {
  margin-bottom: 0.9rem;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.24em;
  color: var(--mist);
}

.foot-list {
  display: flex;
  flex-direction: column;
  gap: 0.42rem;
}

.foot-list a {
  display: inline-block;
  font-size: 0.88rem;
  color: var(--text);
  text-decoration: none;
  transition: color 0.16s var(--ease), transform 0.16s var(--ease);
}

.foot-list a:hover {
  color: var(--amber-soft);
  transform: translateX(4px);
}

.foot-address {
  display: grid;
  gap: 0.6rem;
  font-style: normal;
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--text);
}

.foot-k {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  color: var(--mist);
}

.foot-base {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem 1.4rem;
  margin-top: clamp(2rem, 4vw, 3rem);
  padding-top: 1.1rem;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.05em;
  color: var(--mist);
}

.foot-copy { line-height: 1.6; }

.foot-filing {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.1rem;
  line-height: 1.6;
}

@media (max-width: 860px) {
  .foot-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .foot-brand { grid-column: 1 / -1; }
}

@media (max-width: 520px) {
  .foot-grid { grid-template-columns: minmax(0, 1fr); }
  .foot-base { justify-content: flex-start; }
}

/* ---------- 8. 容器与版式 ---------- */
.wrap {
  max-width: 1220px;
  margin-inline: auto;
  padding-inline: var(--pad-x);
}

.section { padding-block: clamp(2.4rem, 6vw, 4.6rem); }
.section--tight { padding-block: clamp(1.6rem, 3.6vw, 2.6rem); }

.display {
  font-size: clamp(2.6rem, 8.6vw, 6.6rem);
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: -0.045em;
  color: var(--paper);
}

.h2 {
  font-size: clamp(1.5rem, 3.4vw, 2.35rem);
  letter-spacing: -0.03em;
  color: var(--paper);
}

.h3 {
  font-size: clamp(1.02rem, 1.7vw, 1.26rem);
  letter-spacing: -0.015em;
  color: var(--paper);
}

.lede {
  max-width: 58ch;
  font-size: clamp(0.98rem, 1.5vw, 1.1rem);
  line-height: 1.85;
  color: var(--mist);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.24em;
  color: var(--cyan);
}

.eyebrow::before {
  content: "";
  width: 1.7rem;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), transparent);
}

/* ---------- 9. 按钮 ---------- */
.btn {
  --btn-fg: var(--text);
  --btn-bd: var(--line-strong);
  --btn-bg: transparent;
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.72rem 1.25rem;
  border: 1px solid var(--btn-bd);
  border-radius: 12px 4px 12px 4px;
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-size: 0.88rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  line-height: 1.4;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.18s var(--ease), background 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

.btn:hover { transform: translateY(-2px); }

.btn--primary {
  --btn-bg: linear-gradient(104deg, var(--amber-soft), var(--amber));
  --btn-fg: #0B0E14;
  --btn-bd: transparent;
  box-shadow: 0 18px 36px -26px rgba(242, 169, 59, 1);
}

.btn--primary:hover { box-shadow: 0 22px 40px -24px rgba(242, 169, 59, 1); }

.btn--ghost {
  --btn-fg: var(--cyan);
  --btn-bd: rgba(40, 224, 208, 0.45);
  --btn-bg: rgba(40, 224, 208, 0.07);
}

.btn--quiet {
  --btn-fg: var(--mist);
  --btn-bd: var(--line);
}

.btn--quiet:hover { --btn-fg: var(--paper); }

/* ---------- 10. 标记 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.18rem 0.62rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  line-height: 1.7;
  color: var(--mist);
  white-space: nowrap;
}

.tag--amber { color: var(--amber-soft); border-color: rgba(242, 169, 59, 0.5); background: rgba(242, 169, 59, 0.1); }
.tag--cyan { color: var(--cyan); border-color: rgba(40, 224, 208, 0.45); background: rgba(40, 224, 208, 0.08); }
.tag--rose { color: var(--rose); border-color: rgba(240, 78, 138, 0.45); background: rgba(240, 78, 138, 0.1); }

/* ---------- 11. 舱体面板 ---------- */
.panel {
  position: relative;
  padding: clamp(1.15rem, 2.6vw, 1.9rem);
  border: 1px solid var(--line);
  border-radius: var(--r-lg) var(--r-sm) var(--r-lg) var(--r-sm);
  background: linear-gradient(160deg, rgba(26, 32, 43, 0.92), rgba(13, 17, 24, 0.95));
  box-shadow: 0 30px 60px -50px rgba(0, 0, 0, 1);
  overflow: hidden;
}

.panel::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, var(--amber), transparent 48%);
  opacity: 0.55;
}

.panel--a {
  border-radius: var(--r-lg) var(--r-lg) var(--r-sm) var(--r-lg);
  background:
    radial-gradient(120% 140% at 88% -10%, rgba(40, 224, 208, 0.14), transparent 58%),
    linear-gradient(160deg, rgba(26, 32, 43, 0.94), rgba(11, 15, 21, 0.96));
}

.panel--a::before { background: linear-gradient(90deg, var(--cyan), transparent 54%); }

.panel--b { border-radius: var(--r-md); }
.panel--b::before { opacity: 0.35; }

.panel--c {
  padding: 1rem 1.05rem;
  border-style: dashed;
  border-color: var(--line-strong);
  border-radius: var(--r-md);
  background: rgba(17, 21, 28, 0.62);
  box-shadow: none;
}

.panel--c::before { display: none; }

/* ---------- 12. 网格 ---------- */
.grid {
  display: grid;
  gap: clamp(1rem, 2.4vw, 1.75rem);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--asym { grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr); }

@media (max-width: 900px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--asym { grid-template-columns: minmax(0, 1fr); }
}

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

/* ---------- 13. 面包屑 ---------- */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.42rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.crumbs__item {
  color: var(--mist);
  text-decoration: none;
  transition: color 0.16s var(--ease);
}

a.crumbs__item:hover { color: var(--cyan); }

.crumbs__item[aria-current="page"] { color: var(--amber-soft); }

.crumbs__sep {
  color: rgba(140, 150, 168, 0.45);
  font-size: 0.66rem;
}

/* ---------- 14. 图片容器 ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--line);
  border-radius: var(--r-lg) var(--r-sm) var(--r-lg) var(--r-sm);
  background:
    radial-gradient(120% 120% at 18% 0%, rgba(40, 224, 208, 0.17), transparent 56%),
    radial-gradient(120% 120% at 82% 100%, rgba(242, 169, 59, 0.14), transparent 58%),
    var(--ink-3);
}

.media > img,
.media > picture > img,
.media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(to bottom, rgba(10, 12, 16, 0.28) 0 1px, transparent 1px 3px);
  opacity: 0.42;
}

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

/* ---------- 15. 筛选按钮 ---------- */
.filter-set {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.chip {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.42rem 0.95rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: rgba(17, 21, 28, 0.72);
  color: var(--mist);
  font-size: 0.79rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  line-height: 1.6;
  cursor: pointer;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease), background 0.16s var(--ease), transform 0.16s var(--ease);
}

.chip:hover {
  color: var(--text);
  border-color: var(--cyan);
  transform: translateY(-1px);
}

.chip[aria-pressed="true"] {
  color: #0B0E14;
  border-color: transparent;
  background: linear-gradient(100deg, var(--amber-soft), var(--amber));
  box-shadow: 0 14px 28px -22px rgba(242, 169, 59, 1);
}

.chip[aria-pressed="true"]::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--rose);
}

[data-filter-item].is-out { display: none !important; }

/* ---------- 16. 索引列表 ---------- */
.index-list { display: grid; }

.index-row {
  display: grid;
  grid-template-columns: 3.4rem minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.9rem;
  padding: 0.85rem 0.35rem;
  border-bottom: 1px solid var(--line);
  color: var(--text);
  font-size: 0.9rem;
  text-decoration: none;
  transition: background 0.16s var(--ease), padding-left 0.16s var(--ease), color 0.16s var(--ease);
}

.index-row:hover {
  padding-left: 0.75rem;
  background: rgba(40, 224, 208, 0.06);
  color: var(--paper);
}

@media (max-width: 560px) {
  .index-row { grid-template-columns: 2.6rem minmax(0, 1fr); }
}

/* ---------- 17. 路径步骤 ---------- */
.path { display: grid; }

.path__step {
  position: relative;
  display: grid;
  grid-template-columns: 2.6rem minmax(0, 1fr);
  gap: 0.95rem;
  padding-bottom: 1.6rem;
}

.path__step::before {
  content: "";
  position: absolute;
  left: 1.29rem;
  top: 2.7rem;
  bottom: 0.15rem;
  width: 1px;
  background: linear-gradient(180deg, rgba(40, 224, 208, 0.55), rgba(40, 224, 208, 0.06));
}

.path__step:last-child { padding-bottom: 0; }
.path__step:last-child::before { display: none; }

.path__dot {
  display: grid;
  place-items: center;
  width: 2.6rem;
  height: 2.6rem;
  border: 1px solid rgba(40, 224, 208, 0.5);
  border-radius: 50%;
  background: rgba(40, 224, 208, 0.1);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--cyan);
  line-height: 1;
}

/* ---------- 18. 折叠面板 ---------- */
.fold {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(17, 21, 28, 0.72);
  overflow: hidden;
}

.fold + .fold { margin-top: 0.7rem; }

.fold__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: 100%;
  padding: 0.95rem 1.1rem;
  color: var(--paper);
  font-size: 0.94rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  line-height: 1.6;
  text-align: left;
  cursor: pointer;
  transition: background 0.16s var(--ease);
}

.fold__head:hover { background: rgba(40, 224, 208, 0.05); }

.fold__head::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  line-height: 1;
  color: var(--amber);
}

.fold__head[aria-expanded="true"]::after { content: "−"; }

.fold__body {
  padding: 0 1.1rem 1.05rem;
  color: var(--mist);
  font-size: 0.9rem;
  line-height: 1.85;
}

.fold__body[hidden] { display: none; }

/* ---------- 19. 揭示动画 ---------- */
[data-reveal] { opacity: 1; }

.is-reveal-ready [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

.is-reveal-ready [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ---------- 20. 减少动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  .is-reveal-ready [data-reveal],
  [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }

  .rail-link:hover,
  .btn:hover,
  .chip:hover,
  .rail-cta:hover,
  .foot-list a:hover { transform: none; }
}