/* ==========================================================================
   乐鱼赛场 · 共享样式表 /assets/site.css
   结构：重置 → 变量 → 基准排版 → 无障碍 → 布局 → 按钮 → 页头 → 页脚
        → 组件（表格/标签/标签页/折叠/轮次轴/图片容器）→ 动效 → 响应式
   ========================================================================== */

/* ---------- 01 重置 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

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

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

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

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

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

hr { border: 0; }

/* ---------- 02 变量 ---------- */
:root {
  --c-deep: #0A2436;
  --c-night: #051520;
  --c-mid: #123A52;
  --c-cyan: #3FE3D2;
  --c-orange: #FF7A2E;
  --c-paper: #F4EFE4;
  --c-paper-ink: #14202B;
  --c-mist: #DCE4EC;
  --c-line: #24455C;
  --c-red: #D8453C;
  --c-yellow: #E4B23A;
  --c-text: #EAF1F6;
  --c-text-dim: #9FB6C6;
  --c-text-mute: #8FA9BA;
  --c-paper-dim: rgba(20, 32, 43, 0.72);

  --font-display: 'Oswald', 'Archivo Narrow', 'Arial Narrow', 'Source Han Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
  --font-body: 'Source Han Sans SC', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, 'Courier New', monospace;

  --shell: 1240px;
  --gut: clamp(1rem, 2.2vw, 1.75rem);
  --edge: clamp(1rem, 4vw, 2.5rem);
  --rail-h: 64px;
  --bar-h: 58px;

  --t-fast: 160ms;
  --t-base: 210ms;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 03 基准排版 ---------- */
html { font-size: 100%; }

body {
  min-height: 100vh;
  background-color: var(--c-deep);
  background-image:
    linear-gradient(to right, rgba(36, 69, 92, 0.30) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(36, 69, 92, 0.22) 1px, transparent 1px);
  background-size: 96px 96px, 96px 96px;
  color: var(--c-text);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.01em;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.01em;
}

h4, h5, h6 {
  font-family: var(--font-body);
  font-weight: 500;
  line-height: 1.4;
  letter-spacing: 0.02em;
}

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

/* ---------- 04 无障碍 ---------- */
:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 2px;
}

.skip-link {
  position: fixed;
  top: -100px;
  left: 12px;
  z-index: 200;
  padding: 0.6rem 1rem;
  background: var(--c-cyan);
  color: var(--c-night);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.08em;
  transition: top var(--t-fast) var(--ease);
}

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

/* ---------- 05 布局 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--edge);
}

.section {
  position: relative;
  padding-block: clamp(2.5rem, 6vw, 5rem);
  border-top: 1px solid var(--c-line);
}

.section--paper {
  background: var(--c-paper);
  color: var(--c-paper-ink);
  border-top-color: rgba(20, 32, 43, 0.18);
}

.section--flush { border-top: 0; }

.section__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 0.35rem 1.5rem;
  margin-bottom: clamp(1.5rem, 3vw, 2.5rem);
}

.section__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  line-height: 1;
  color: var(--c-cyan);
}

.section__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.35rem, 3vw, 2.15rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  text-transform: uppercase;
}

.section__desc {
  grid-column: 2;
  max-width: 62ch;
  color: var(--c-text-dim);
  font-size: 15px;
}

.section--paper .section__num { color: var(--c-orange); }
.section--paper .section__desc { color: var(--c-paper-dim); }

.page-head {
  padding-block: clamp(2rem, 5vw, 3.5rem);
  border-bottom: 1px solid var(--c-line);
}

.grid { display: grid; gap: var(--gut); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--rail { grid-template-columns: minmax(0, 1fr) minmax(220px, 300px); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

.span-4 { grid-column: span 4; }
.span-6 { grid-column: span 6; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: span 12; }

.rule { height: 1px; background: var(--c-line); }

.tick-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-text-dim);
  text-transform: uppercase;
}

.lede {
  max-width: 62ch;
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  line-height: 1.8;
  color: var(--c-mist);
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding-block: 0.9rem;
  border-top: 1px solid var(--c-line);
}

.stat__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.8rem, 4.5vw, 3rem);
  line-height: 1;
  color: var(--c-cyan);
}

.stat__key {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--c-text-dim);
}

.paper-block {
  background: var(--c-paper);
  color: var(--c-paper-ink);
  padding: clamp(1.5rem, 4vw, 3rem);
  box-shadow: 12px 12px 0 -1px var(--c-deep), 12px 12px 0 0 var(--c-line);
}

.paper-block .section__title,
.paper-block h3 { color: var(--c-paper-ink); }

.paper-block a {
  color: #0A5566;
  border-bottom: 1px solid rgba(10, 85, 102, 0.45);
}

.paper-block a:hover { border-bottom-color: #0A5566; }

.prose {
  max-width: 68ch;
  font-size: 16.5px;
  line-height: 1.85;
}

.prose > * + * { margin-top: 1.1em; }

.prose h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  margin-top: 1.8em;
}

.prose ul { padding-left: 0; }

.prose li {
  position: relative;
  padding-left: 1.1rem;
}

.prose li + li { margin-top: 0.5em; }

.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.8em;
  width: 9px;
  height: 1px;
  background: var(--c-orange);
}

/* ---------- 06 按钮 ---------- */
.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.8rem 1.4rem;
  border: 1px solid var(--c-cyan);
  background: transparent;
  color: var(--c-cyan);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: background-color var(--t-fast) var(--ease),
              color var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease),
              transform var(--t-fast) var(--ease);
}

.btn:hover {
  background: var(--c-cyan);
  color: var(--c-night);
  transform: translateY(-2px);
}

.btn--solid { background: var(--c-cyan); color: var(--c-night); }
.btn--solid:hover { background: #5CF0E0; }

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

.btn--ghost { border-color: var(--c-line); color: var(--c-text); }
.btn--ghost:hover { background: transparent; border-color: var(--c-cyan); color: var(--c-cyan); }

/* ---------- 07 面包屑 ---------- */
.breadcrumb {
  border-bottom: 1px solid var(--c-line);
  padding-block: 0.9rem;
  font-size: 13px;
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--c-text-dim);
  letter-spacing: 0.06em;
}

.breadcrumb__item a:hover { color: var(--c-cyan); }
.breadcrumb__sep { color: var(--c-line); }
.breadcrumb__item[aria-current="page"] { color: var(--c-text); }

/* ---------- 08 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background-color: var(--c-night);
  background-image: linear-gradient(to right, rgba(63, 227, 210, 0.07) 1px, transparent 1px);
  background-size: 64px 100%;
  border-bottom: 1px solid var(--c-line);
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 80;
  background: transparent;
  pointer-events: none;
}

.scroll-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--c-cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 120ms linear;
}

/* 上层：品牌 + 赛季坐标 */
.header-rail {
  background: rgba(10, 36, 54, 0.62);
  border-bottom: 1px solid var(--c-line);
}

.header-rail__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem var(--gut);
  min-height: var(--rail-h);
  padding-block: 0.55rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--c-text);
}

.brand__mark {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  line-height: 1;
  padding: 0.38rem 0.5rem;
  background: var(--c-cyan);
  color: var(--c-night);
  transition: background-color var(--t-fast) var(--ease);
}

.brand:hover .brand__mark { background: var(--c-orange); }

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.06em;
}

.brand__tag {
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--c-text-dim);
}

.coord-strip {
  display: flex;
  flex-wrap: wrap;
  border: 1px solid var(--c-line);
}

.coord {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  min-width: 118px;
  padding: 0.32rem 0.9rem;
  border-left: 1px solid var(--c-line);
}

.coord:first-child { border-left: 0; }

.coord__k {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--c-text-dim);
}

.coord__v {
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.4;
  color: var(--c-text);
}

.coord--active { background: rgba(255, 122, 46, 0.1); }
.coord--active .coord__v { color: var(--c-orange); }

/* 下层：栏目导航 */
.header-bar {
  position: relative;
  background: linear-gradient(180deg, rgba(18, 58, 82, 0.42), rgba(5, 21, 32, 0));
}

.header-bar__inner {
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  gap: var(--gut);
  min-height: var(--bar-h);
}

.nav-toggle {
  display: none;
  align-items: center;
  align-self: center;
  gap: 0.6rem;
  padding: 0.55rem 0.8rem;
  border: 1px solid var(--c-line);
  color: var(--c-text);
  font-size: 13px;
  letter-spacing: 0.14em;
  cursor: pointer;
  transition: border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 18px;
}

.nav-toggle__bars span {
  display: block;
  height: 1px;
  background: currentColor;
}

.nav-toggle[aria-expanded="true"] {
  border-color: var(--c-cyan);
  color: var(--c-cyan);
}

.site-nav {
  display: flex;
  flex: 1;
  align-items: stretch;
  justify-content: space-between;
  gap: var(--gut);
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
}

.nav-list__item { display: flex; }

.nav-list__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding-inline: clamp(0.6rem, 1.4vw, 1.05rem);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--c-text-dim);
  transition: color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}

.nav-list__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--c-cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--t-base) var(--ease);
}

.nav-list__link:hover { color: var(--c-text); transform: translateY(-2px); }
.nav-list__link:hover::after { transform: scaleX(1); }

.nav-list__link[aria-current="page"] {
  color: var(--c-cyan);
  background: rgba(63, 227, 210, 0.08);
}

.nav-list__link[aria-current="page"]::after { transform: scaleX(1); }

.nav-list__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0;
  color: #5C7E95;
}

.nav-list__link[aria-current="page"] .nav-list__idx { color: var(--c-cyan); }

.nav-utility {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding-left: var(--gut);
  border-left: 1px solid var(--c-line);
}

.nav-utility__label {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--c-text-dim);
  white-space: nowrap;
}

.utility-list {
  display: flex;
  gap: 1rem;
}

.utility-list__link {
  font-size: 13px;
  color: var(--c-mist);
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.utility-list__link:hover {
  color: var(--c-cyan);
  border-bottom-color: var(--c-cyan);
}

/* ---------- 09 页脚 ---------- */
.site-footer {
  background: var(--c-night);
  border-top: 1px solid var(--c-line);
  color: var(--c-mist);
  font-size: 14px;
}

.round-strip {
  background: linear-gradient(90deg, rgba(63, 227, 210, 0.07), rgba(255, 122, 46, 0.06));
  border-bottom: 1px solid var(--c-line);
}

.round-strip__inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding-block: 0.55rem;
  overflow: hidden;
}

.round-strip__label {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--c-cyan);
  white-space: nowrap;
}

.round-strip__ticks {
  display: flex;
  flex: 1;
  min-width: 0;
  justify-content: space-between;
}

.round-strip__tick {
  position: relative;
  padding-left: 0.7rem;
  font-family: var(--font-mono);
  font-size: 11px;
  color: #4E6E85;
}

.round-strip__tick::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 1px;
  height: 12px;
  transform: translateY(-50%);
  background: var(--c-line);
}

.round-strip__tick--current { color: var(--c-orange); }
.round-strip__tick--current::before { height: 18px; background: var(--c-orange); }

.footer-main {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) repeat(2, minmax(0, 0.9fr)) minmax(0, 1.2fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  padding-block: clamp(2.5rem, 5vw, 4rem);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 46ch;
}

.brand--footer .brand__name { font-size: 1.05rem; }

.footer-summary {
  color: #A9C0CF;
  font-size: 14px;
  line-height: 1.8;
}

.footer-note {
  padding-left: 0.75rem;
  border-left: 2px solid var(--c-orange);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--c-orange);
}

.footer-col__title {
  margin-bottom: 1rem;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--c-cyan);
}

.footer-col__list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer-col__link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 14px;
  color: #B9CEDA;
  transition: color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}

.footer-col__link::before {
  content: "";
  width: 10px;
  height: 1px;
  background: var(--c-line);
  transition: background-color var(--t-fast) var(--ease);
}

.footer-col__link:hover { color: var(--c-cyan); transform: translateX(3px); }
.footer-col__link:hover::before { background: var(--c-cyan); }

.contact-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.contact-list__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.75rem;
  align-items: baseline;
  font-size: 14px;
}

.contact-list__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--c-text-dim);
}

.contact-list__v {
  color: var(--c-mist);
  word-break: break-word;
}

.contact-note {
  margin-top: 1rem;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-text-mute);
}

.footer-base {
  background: rgba(5, 21, 32, 0.72);
  border-top: 1px solid var(--c-line);
}

.footer-base__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  padding-block: 1.1rem;
  font-size: 13px;
  color: var(--c-text-mute);
}

.footer-legal,
.footer-icp {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

.footer-legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem;
}

.footer-legal-links a {
  color: #B9CEDA;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.footer-legal-links a:hover {
  color: var(--c-cyan);
  border-bottom-color: var(--c-cyan);
}

/* ---------- 10 组件：状态标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.18rem 0.55rem;
  border: 1px solid var(--c-line);
  background: rgba(18, 58, 82, 0.5);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-text);
  white-space: nowrap;
}

.tag::before {
  content: "";
  width: 6px;
  height: 6px;
  background: currentColor;
}

.tag--ok {
  color: var(--c-cyan);
  border-color: rgba(63, 227, 210, 0.55);
  background: rgba(63, 227, 210, 0.08);
}

.tag--pending {
  color: var(--c-orange);
  border-color: rgba(255, 122, 46, 0.5);
  background: rgba(255, 122, 46, 0.08);
}

.tag--warn {
  color: var(--c-yellow);
  border-color: rgba(228, 178, 58, 0.5);
  background: rgba(228, 178, 58, 0.08);
}

.tag--danger {
  color: var(--c-red);
  border-color: rgba(216, 69, 60, 0.55);
  background: rgba(216, 69, 60, 0.1);
}

.tag--muted { color: var(--c-text-dim); }

/* ---------- 11 组件：数据表 ---------- */
.table-scroll {
  overflow-x: auto;
  border: 1px solid var(--c-line);
}

.data-table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  font-size: 14px;
}

.data-table caption {
  padding: 0.7rem 1rem;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--c-text-dim);
  border-bottom: 1px solid var(--c-line);
}

.data-table th,
.data-table td {
  padding: 0.7rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--c-line);
  vertical-align: baseline;
}

.data-table thead th {
  position: sticky;
  top: 0;
  z-index: 2;
  background: var(--c-night);
  color: var(--c-mist);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
}

.data-table tbody tr:nth-child(even) { background: rgba(18, 58, 82, 0.32); }
.data-table tbody tr:hover { background: var(--c-mid); }
.data-table tbody tr[aria-expanded="true"] { background: rgba(63, 227, 210, 0.08); }

.data-table .num,
.data-table td[data-type="num"] {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.table-detail {
  padding: 0.9rem 1rem 1.1rem;
  background: rgba(5, 21, 32, 0.6);
  color: var(--c-mist);
  font-size: 13.5px;
  line-height: 1.75;
}

/* ---------- 12 组件：标签页 ---------- */
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  border-bottom: 1px solid var(--c-line);
}

.tab {
  padding: 0.6rem 1rem;
  border-bottom: 2px solid transparent;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--c-text-dim);
  cursor: pointer;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

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

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

.tab-panel { padding-top: var(--gut); }
.tab-panel[hidden] { display: none; }

/* ---------- 13 组件：折叠面板 ---------- */
.accordion { border-top: 1px solid var(--c-line); }

.accordion__item { border-bottom: 1px solid var(--c-line); }

.accordion__trigger {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.05rem 0.25rem;
  text-align: left;
  font-size: 16px;
  font-weight: 500;
  line-height: 1.5;
  cursor: pointer;
  transition: color var(--t-fast) var(--ease), padding-left var(--t-fast) var(--ease);
}

.accordion__trigger:hover {
  color: var(--c-cyan);
  padding-left: 0.6rem;
}

.accordion__icon {
  position: relative;
  flex: none;
  width: 14px;
  height: 14px;
}

.accordion__icon::before,
.accordion__icon::after {
  content: "";
  position: absolute;
  background: currentColor;
}

.accordion__icon::before { left: 0; right: 0; top: 6px; height: 1px; }

.accordion__icon::after {
  top: 0;
  bottom: 0;
  left: 6px;
  width: 1px;
  transition: transform var(--t-base) var(--ease);
}

.accordion__item.is-open .accordion__icon::after { transform: scaleY(0); }

.accordion__panel {
  max-width: 72ch;
  padding: 0 0.25rem 1.3rem;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-mist);
}

.accordion__panel[hidden] { display: none; }

/* ---------- 14 组件：轮次轴 ---------- */
.round-axis {
  display: flex;
  overflow-x: auto;
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
}

.round-axis__item {
  flex: none;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  min-width: 88px;
  padding: 0.75rem 1.1rem;
  border-right: 1px solid var(--c-line);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-text-dim);
  transition: background-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.round-axis__item:last-child { border-right: 0; }
.round-axis__item:hover { background: var(--c-mid); color: var(--c-text); }

.round-axis__item[aria-current="true"] {
  color: var(--c-cyan);
  background: rgba(63, 227, 210, 0.07);
  box-shadow: inset 0 -2px 0 var(--c-cyan);
}

/* ---------- 15 组件：图片容器 ---------- */
.media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--c-line);
  background-color: var(--c-mid);
  background-image: repeating-linear-gradient(
    135deg,
    rgba(36, 69, 92, 0.55) 0 1px,
    transparent 1px 12px
  );
}

.media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media--wide { aspect-ratio: 21 / 9; }
.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x5 { aspect-ratio: 4 / 5; }
.media--1x1 { aspect-ratio: 1 / 1; }

.media__label {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 0.4rem 0.7rem;
  border-top: 1px solid var(--c-line);
  border-right: 1px solid var(--c-line);
  background: var(--c-night);
  color: var(--c-cyan);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
}

.media--overflow-right { margin-right: calc(-1 * var(--gut)); }

/* ---------- 16 动效 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 380ms var(--ease), transform 380ms var(--ease);
}

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

/* ---------- 17 响应式 ---------- */
@media (max-width: 1080px) {
  .footer-main {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .footer-brand { grid-column: 1 / -1; max-width: 62ch; }
}

@media (max-width: 1024px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--rail { grid-template-columns: minmax(0, 1fr); }

  .nav-list__link { font-size: 14px; padding-inline: 0.7rem; }
  .nav-list__idx { display: none; }
  .nav-utility__label { display: none; }
}

@media (max-width: 900px) {
  .span-4, .span-6, .span-8 { grid-column: span 12; }
  .grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }

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

  .header-bar__inner { justify-content: flex-end; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    gap: 0;
    max-height: 72vh;
    overflow-y: auto;
    background: var(--c-night);
    border-bottom: 1px solid var(--c-cyan);
  }

  .site-nav[data-open] { display: flex; }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
  }

  .nav-list__item { display: block; }

  .nav-list__link {
    width: 100%;
    padding: 0.85rem var(--edge);
    font-size: 15px;
    border-bottom: 1px solid var(--c-line);
  }

  .nav-list__link::after { display: none; }
  .nav-list__link:hover { transform: none; }
  .nav-list__idx { display: inline; }

  .nav-list__link[aria-current="page"] {
    box-shadow: inset 3px 0 0 var(--c-cyan);
    background: rgba(63, 227, 210, 0.09);
  }

  .nav-utility {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
    padding: 1rem var(--edge) 1.3rem;
    border-left: 0;
    border-top: 1px solid var(--c-line);
  }

  .nav-utility__label { display: block; }
  .utility-list { flex-direction: column; gap: 0.55rem; }
  .utility-list__link { font-size: 14px; }
}

@media (max-width: 760px) {
  .coord-strip { display: none; }
  .header-rail__inner { min-height: 56px; }

  .footer-main { grid-template-columns: minmax(0, 1fr); }
  .footer-base__inner { justify-content: flex-start; }

  .grid--2, .grid--3 { grid-template-columns: minmax(0, 1fr); }
  .grid--12 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

  .paper-block { box-shadow: 8px 8px 0 -1px var(--c-deep), 8px 8px 0 0 var(--c-line); }

  .section__head { grid-template-columns: minmax(0, 1fr); }
  .section__desc { grid-column: 1; }
}

@media (max-width: 480px) {
  .round-strip__tick:nth-child(n + 6) { display: none; }
  .btn { width: 100%; justify-content: center; }
}

/* ---------- 18 减少动效 ---------- */
@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;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .btn:hover,
  .nav-list__link:hover,
  .footer-col__link:hover,
  .accordion__trigger:hover {
    transform: none;
  }

  .scroll-progress__bar { transition: none; }
}