/* ============================================================
   亚星赛事 · /assets/site.css
   共享外壳：reset / 变量 / 排版 / 页头 / 页脚 / 通用组件
   ============================================================ */

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

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

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

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

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

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

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

button { background: none; border: 0; }

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

/* ---------- 变量 ---------- */
:root {
  --ink-900: #070B14;
  --ink-800: #0E1A2B;
  --ink-700: #1A2A3F;
  --ink-600: #2A2F3A;
  --mute: #6B6F8A;
  --paper: #E8EEF7;
  --cyan: #38F2D6;
  --orange: #FF7A3D;
  --amber: #FFB547;
  --teal: #0B3B3A;

  --hair: rgba(232, 238, 247, 0.12);
  --hair-strong: rgba(232, 238, 247, 0.26);
  --cyan-soft: rgba(56, 242, 214, 0.10);
  --orange-soft: rgba(255, 122, 61, 0.12);
  --amber-soft: rgba(255, 181, 71, 0.12);

  --font-display: "Arial Narrow", "Helvetica Neue Condensed", "Franklin Gothic Medium",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Impact, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas,
    "Roboto Mono", "Noto Sans Mono", "Courier New", monospace;
  --font-body: system-ui, -apple-system, "Segoe UI", Roboto,
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-serif: Georgia, "Songti SC", "Source Han Serif SC", "SimSun", "Times New Roman", serif;

  --shell: 1520px;
  --gutter: clamp(0.9rem, 3vw, 2.5rem);
  --rail-h: 60px;
  --radius: 2px;
}

/* ---------- 基础排版 ---------- */
body {
  min-height: 100%;
  background-color: var(--ink-900);
  background-image:
    radial-gradient(60% 38% at 88% -6%, rgba(56, 242, 214, 0.085), transparent 68%),
    radial-gradient(46% 30% at 3% 3%, rgba(255, 122, 61, 0.055), transparent 72%);
  background-repeat: no-repeat;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: 0.01em;
}

strong { font-weight: 700; }

::selection { background: var(--cyan); color: var(--ink-900); }

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

/* ---------- 布局工具 ---------- */
.shell {
  width: min(var(--shell), calc(100% - var(--gutter) * 2));
  margin-inline: auto;
}

.section { padding-block: clamp(2.8rem, 6vw, 6rem); }
.section--tight { padding-block: clamp(1.6rem, 3.5vw, 3rem); }

.hairline {
  height: 1px;
  border: 0;
  margin: 0;
  background: var(--hair);
}

.grid { display: grid; gap: clamp(1rem, 2.2vw, 1.8rem); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(min(340px, 100%), 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(min(270px, 100%), 1fr)); }

/* ---------- 排版工具 ---------- */
.t-display {
  font-family: var(--font-display);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: -0.005em;
  line-height: 0.94;
  color: var(--paper);
}

.t-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
  letter-spacing: 0.02em;
}

.t-editorial {
  font-family: var(--font-serif);
  font-weight: 400;
  line-height: 1.4;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.t-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--cyan);
}

/* ---------- skip link ---------- */
.skip-link {
  position: absolute;
  left: 1rem;
  top: -120px;
  z-index: 200;
  padding: 0.7rem 1.1rem;
  background: var(--cyan);
  color: #04121A;
  font-family: var(--font-display);
  font-size: 0.9rem;
  letter-spacing: 0.1em;
  transition: top 0.2s ease;
}

.skip-link:focus { top: 0.6rem; }

/* ============================================================
   页头
   ============================================================ */
.masthead {
  position: sticky;
  top: 0;
  z-index: 90;
  background: var(--ink-900);
  border-bottom: 1px solid var(--hair);
}

.masthead__deck {
  display: grid;
  grid-template-rows: 1fr;
  background:
    linear-gradient(90deg, rgba(11, 59, 58, 0.45) 0%, rgba(7, 11, 20, 0) 42%),
    var(--ink-900);
  border-bottom: 1px solid var(--hair);
  transition: grid-template-rows 0.45s ease, opacity 0.35s ease;
}

.masthead[data-scrolled] .masthead__deck {
  grid-template-rows: 0fr;
  opacity: 0;
}

.deck-inner {
  overflow: hidden;
  min-height: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.85rem 2.2rem;
  width: min(var(--shell), calc(100% - var(--gutter) * 2));
  margin-inline: auto;
  padding: 1.05rem 0 1.15rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.62rem;
  flex: 0 0 auto;
}

.brand__pulse {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 0 rgba(56, 242, 214, 0.55);
  animation: pulse-ring 2.6s ease-out infinite;
}

@keyframes pulse-ring {
  0%   { box-shadow: 0 0 0 0 rgba(56, 242, 214, 0.55); }
  70%  { box-shadow: 0 0 0 11px rgba(56, 242, 214, 0); }
  100% { box-shadow: 0 0 0 0 rgba(56, 242, 214, 0); }
}

.brand__word {
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 1.9vw, 1.6rem);
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--paper);
}

.brand__tagline {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.24em;
  color: var(--mute);
  padding-left: 0.7rem;
  border-left: 1px solid var(--hair-strong);
}

.deck-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.34rem;
  margin-inline-start: auto;
}

.deck-link {
  display: inline-block;
  padding: 0.34rem 0.66rem;
  border: 1px solid var(--hair);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--mute);
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.deck-link:hover,
.deck-link:focus-visible {
  color: var(--cyan);
  border-color: rgba(56, 242, 214, 0.5);
  background: var(--cyan-soft);
}

.deck-clock {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  padding-left: 1rem;
  border-left: 1px solid var(--hair);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
}

.deck-clock__label { color: var(--mute); }

.deck-clock__value {
  color: var(--cyan);
  font-size: 0.86rem;
  font-variant-numeric: tabular-nums;
}

/* ---- 下层导航轨道 ---- */
.masthead__rail {
  position: relative;
  background: linear-gradient(90deg, rgba(14, 26, 43, 0.92), rgba(7, 11, 20, 0.92));
}

.rail-inner {
  display: flex;
  align-items: stretch;
  gap: 1.1rem;
  width: min(var(--shell), calc(100% - var(--gutter) * 2));
  margin-inline: auto;
  min-height: var(--rail-h);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.6rem;
  margin: 0.55rem 0;
  padding: 0.5rem 0.85rem;
  border: 1px solid var(--hair-strong);
  background: transparent;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--paper);
  transition: border-color 0.2s ease, color 0.2s ease;
}

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

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 16px;
}

.nav-toggle__bars > span {
  display: block;
  height: 2px;
  background: var(--cyan);
  transition: transform 0.25s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars > span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars > span:nth-child(2) { opacity: 0; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars > span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.primary-nav {
  flex: 1 1 auto;
  display: flex;
  min-width: 0;
}

.primary-nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
}

.primary-nav__item { display: flex; }

.primary-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0 clamp(0.7rem, 1.5vw, 1.4rem);
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 0.1em;
  color: var(--mute);
  white-space: nowrap;
  transition: color 0.2s ease, background 0.2s ease;
}

.primary-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.28s ease, background 0.2s ease;
}

.primary-nav__link:hover,
.primary-nav__link:focus-visible {
  color: var(--paper);
  background: rgba(56, 242, 214, 0.05);
}

.primary-nav__link:hover::after,
.primary-nav__link:focus-visible::after { transform: scaleX(1); }

.primary-nav__link[aria-current="page"] { color: var(--paper); }

.primary-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--orange);
}

.primary-nav__idx {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0;
  color: var(--mute);
  opacity: 0.7;
}

.primary-nav__link[aria-current="page"] .primary-nav__idx {
  color: var(--orange);
  opacity: 1;
}

.rail-note {
  margin-inline-start: auto;
  display: flex;
  align-items: center;
  padding-inline-start: clamp(0.8rem, 2vw, 1.6rem);
  border-left: 1px solid var(--hair);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--mute);
  white-space: nowrap;
}

.masthead__progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
  transform: scaleX(var(--p, 0));
  transform-origin: left center;
  pointer-events: none;
}

/* ============================================================
   页脚
   ============================================================ */
.site-foot {
  position: relative;
  margin-top: clamp(2.6rem, 6vw, 6rem);
  background: var(--ink-900);
  border-top: 1px solid var(--hair);
}

.site-foot::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(56, 242, 214, 0.6) 22%, rgba(255, 122, 61, 0.45) 62%, transparent);
}

.foot-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.85fr) minmax(0, 0.95fr) minmax(0, 1.15fr);
  gap: clamp(1.6rem, 3.6vw, 3.4rem);
  width: min(var(--shell), calc(100% - var(--gutter) * 2));
  margin-inline: auto;
  padding: clamp(2.4rem, 5vw, 4.4rem) 0 clamp(1.6rem, 3vw, 2.6rem);
  border-bottom: 1px solid var(--hair);
}

.foot-mark {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 2.7vw, 2.35rem);
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  line-height: 1;
  color: var(--paper);
}

.foot-summary {
  margin-top: 0.95rem;
  max-width: 34ch;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--mute);
}

.foot-index {
  margin-top: 1.3rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mute);
}

.foot-col__title {
  margin-bottom: 1rem;
  padding-bottom: 0.7rem;
  border-bottom: 1px solid var(--hair);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.foot-links li + li { margin-top: 0.6rem; }

.foot-links a {
  position: relative;
  display: inline-block;
  font-size: 0.94rem;
  color: var(--mute);
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.foot-links a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 0;
  height: 1px;
  background: var(--cyan);
  transition: width 0.22s ease;
}

.foot-links a:hover,
.foot-links a:focus-visible {
  color: var(--paper);
  padding-left: 1.1rem;
}

.foot-links a:hover::before,
.foot-links a:focus-visible::before { width: 0.75rem; }

.foot-contact li {
  display: grid;
  grid-template-columns: 3.4rem minmax(0, 1fr);
  gap: 0.55rem;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--mute);
}

.foot-contact li + li { margin-top: 0.72rem; }

.foot-contact__k {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--mute);
  padding-top: 0.25rem;
}

.foot-contact__v {
  color: var(--paper);
  word-break: break-word;
}

.foot-note {
  margin-top: 1.1rem;
  padding-top: 0.9rem;
  border-top: 1px dashed var(--hair);
  font-size: 0.82rem;
  line-height: 1.8;
  color: var(--mute);
}

.foot-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem 2rem;
  width: min(var(--shell), calc(100% - var(--gutter) * 2));
  margin-inline: auto;
  padding: 1.2rem 0 2.1rem;
}

.foot-legal {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--mute);
}

.foot-base-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--mute);
}

.foot-base-links a { transition: color 0.2s ease; }

.foot-base-links a:hover,
.foot-base-links a:focus-visible { color: var(--cyan); }

/* ============================================================
   通用组件
   ============================================================ */

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.85rem 1.5rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-display);
  font-size: 0.94rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn--primary {
  background: var(--orange);
  border-color: var(--orange);
  color: #16060B;
}

.btn--primary:hover,
.btn--primary:focus-visible {
  background: #FF9161;
  border-color: #FF9161;
}

.btn--cyan {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #04121A;
}

.btn--cyan:hover,
.btn--cyan:focus-visible {
  background: #6DF6E2;
  border-color: #6DF6E2;
}

.btn--ghost {
  background: transparent;
  border-color: var(--hair-strong);
  color: var(--paper);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
  background: var(--cyan-soft);
}

/* 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.24rem 0.6rem;
  border: 1px solid var(--hair);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mute);
}

.tag--live {
  color: var(--orange);
  border-color: rgba(255, 122, 61, 0.5);
  background: var(--orange-soft);
}

.tag--cyan {
  color: var(--cyan);
  border-color: rgba(56, 242, 214, 0.45);
  background: var(--cyan-soft);
}

.tag--amber {
  color: var(--amber);
  border-color: rgba(255, 181, 71, 0.45);
  background: var(--amber-soft);
}

/* 面板 */
.panel {
  position: relative;
  padding: clamp(1.2rem, 2.4vw, 2rem);
  background: var(--ink-800);
  border: 1px solid var(--hair);
  border-radius: var(--radius);
}

.panel--flush {
  background: transparent;
  border: 0;
  border-top: 1px solid var(--hair);
  border-bottom: 1px solid var(--hair);
  border-radius: 0;
}

/* 面包屑 */
.crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mute);
}

.crumb a { transition: color 0.2s ease; }

.crumb a:hover,
.crumb a:focus-visible { color: var(--cyan); }

.crumb__sep { color: var(--hair-strong); }

.crumb [aria-current="page"] { color: var(--paper); }

/* 正文 */
.prose {
  max-width: 72ch;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--paper);
}

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

.prose h2 {
  margin: 2.2em 0 0.7em;
  font-size: clamp(1.4rem, 2.4vw, 2rem);
  letter-spacing: 0.02em;
}

.prose h3 {
  margin: 1.8em 0 0.6em;
  font-size: clamp(1.1rem, 1.7vw, 1.35rem);
  color: var(--cyan);
}

.prose ul,
.prose ol { margin-top: 0.9em; }

.prose ul li,
.prose ol li {
  position: relative;
  padding-left: 1.25rem;
  margin-top: 0.55em;
  color: var(--mute);
}

.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 0.55rem;
  height: 1px;
  background: var(--cyan);
}

.prose ol { counter-reset: pxol; }

.prose ol li::before {
  content: counter(pxol, decimal-leading-zero);
  counter-increment: pxol;
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-mono);
  font-size: 0.78em;
  color: var(--cyan);
}

.prose a {
  color: var(--cyan);
  border-bottom: 1px solid rgba(56, 242, 214, 0.35);
  transition: border-color 0.2s ease;
}

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

.prose blockquote {
  margin: 1.6em 0;
  padding: 0.4em 0 0.4em 1.3em;
  border-left: 2px solid var(--orange);
  font-family: var(--font-serif);
  font-size: 1.15em;
  line-height: 1.7;
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: 0.1em 0.35em;
  background: var(--ink-700);
  border-radius: var(--radius);
  color: var(--cyan);
}

/* 图片容器 */
.figure {
  position: relative;
  display: block;
  margin: 0;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid var(--hair);
  border-radius: var(--radius);
  background: linear-gradient(140deg, var(--ink-800) 0%, var(--ink-900) 72%);
}

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

.figure--wide { aspect-ratio: 21 / 9; }
.figure--tall { aspect-ratio: 4 / 5; }
.figure--square { aspect-ratio: 1 / 1; }

.figure--grid {
  background-image:
    linear-gradient(rgba(56, 242, 214, 0.09) 1px, transparent 1px),
    linear-gradient(90deg, rgba(56, 242, 214, 0.09) 1px, transparent 1px),
    linear-gradient(140deg, var(--ink-800) 0%, var(--ink-900) 72%);
  background-size: 34px 34px, 34px 34px, 100% 100%;
}

.figure__veil {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, transparent 42%, rgba(7, 11, 20, 0.88) 100%);
}

.figure__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 0.85rem 1.1rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mute);
}

/* 左侧垂直分类标签 */
.rail-tags {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding-left: 0.8rem;
  border-left: 1px solid var(--hair);
}

.rail-tag {
  position: relative;
  display: block;
  width: 100%;
  margin-left: -0.82rem;
  padding: 0.5rem 0.7rem;
  border-left: 2px solid transparent;
  text-align: start;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  color: var(--mute);
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.rail-tag:hover,
.rail-tag:focus-visible { color: var(--paper); }

.rail-tag[aria-pressed="true"] {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: var(--cyan-soft);
}

/* 页面内主题筛选 */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.filter-btn {
  padding: 0.42rem 0.9rem;
  border: 1px solid var(--hair);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  color: var(--mute);
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.filter-btn:hover,
.filter-btn:focus-visible {
  color: var(--paper);
  border-color: var(--hair-strong);
}

.filter-btn[aria-pressed="true"] {
  color: #04121A;
  background: var(--cyan);
  border-color: var(--cyan);
}

[data-filter-scope] [data-cat][hidden] { display: none !important; }

/* 标签页 */
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  padding-bottom: 0.7rem;
  border-bottom: 1px solid var(--hair);
}

.tab {
  padding: 0.5rem 0.95rem;
  margin-bottom: -0.72rem;
  border-bottom: 2px solid transparent;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--mute);
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease;
}

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

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

.tabpanel[hidden] { display: none; }

/* 折叠面板 / FAQ */
.accordion { border-top: 1px solid var(--hair); }

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

.accordion__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: 100%;
  padding: 1.1rem 0.2rem;
  text-align: start;
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: 0.06em;
  color: var(--paper);
  cursor: pointer;
  transition: color 0.2s ease;
}

.accordion__trigger::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--cyan);
}

.accordion__trigger[aria-expanded="true"]::after { content: "–"; }

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

.accordion__panel {
  padding: 0 0.2rem 1.3rem;
  color: var(--mute);
  line-height: 1.85;
}

.accordion__panel[hidden] { display: none; }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1180px) {
  .foot-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr) minmax(0, 1fr);
  }
  .foot-col:last-child { grid-column: 1 / -1; }
}

@media (max-width: 980px) {
  .rail-inner { align-items: center; min-height: 56px; }

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

  .rail-note { display: none; }

  .primary-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    z-index: 12;
    display: block;
    max-height: 0;
    overflow: hidden;
    background: var(--ink-800);
    border-block: 1px solid var(--hair);
    transition: max-height 0.38s ease;
  }

  .primary-nav[data-open] {
    max-height: min(72vh, 560px);
    overflow-y: auto;
  }

  .primary-nav__list {
    flex-direction: column;
    padding: 0.35rem 0;
  }

  .primary-nav__item { width: 100%; }

  .primary-nav__link {
    width: 100%;
    padding: 0.9rem 1.1rem;
    border-bottom: 1px solid var(--hair);
    font-size: 1.02rem;
  }

  .primary-nav__link::after {
    left: 0;
    top: 0;
    right: auto;
    bottom: 0;
    width: 3px;
    height: auto;
    transform: scaleY(0);
    transform-origin: top center;
  }

  .primary-nav__link:hover::after,
  .primary-nav__link:focus-visible::after,
  .primary-nav__link[aria-current="page"]::after { transform: scaleY(1); }

  .deck-clock { display: none; }
}

@media (max-width: 860px) {
  .foot-grid { grid-template-columns: repeat(auto-fit, minmax(min(240px, 100%), 1fr)); }
  .foot-col:last-child { grid-column: auto; }
}

@media (max-width: 720px) {
  .deck-links { margin-inline-start: 0; width: 100%; }
  .brand__tagline { display: none; }
  .deck-inner { padding: 0.9rem 0 1rem; gap: 0.7rem 1rem; }
  .foot-base { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
  .brand__word { font-size: 1.18rem; }
  .deck-link { font-size: 0.68rem; padding: 0.3rem 0.55rem; }
  .btn { width: 100%; justify-content: center; }
}

/* ---------- 动效偏好 ---------- */
@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;
  }

  .brand__pulse { animation: none; }
}