/* ============================================================
   凤凰体育主站 / site.css
   蓝图网格 · 深焰红与鎏金 · 深夜赛事控制室
   ============================================================ */

/* ---------- 1. 变量 ---------- */
:root {
  --ink: #080B12;
  --ink-soft: #0A0F1A;
  --panel: #101827;
  --flame: #E63946;
  --flame-dark: #7A1E2B;
  --gold: #F4B942;
  --jade: #3DD6C4;
  --paper: #F5F0E6;
  --smoke: #A8B0BD;
  --alert: #FF7A45;
  --glass: rgba(255, 255, 255, 0.12);

  --line: rgba(255, 255, 255, 0.10);
  --line-strong: rgba(255, 255, 255, 0.20);
  --line-soft: rgba(255, 255, 255, 0.045);

  --font-head: 'Barlow Condensed', 'Oswald', 'Noto Sans SC', system-ui, sans-serif;
  --font-body: 'Noto Sans SC', 'Source Han Sans SC', system-ui, -apple-system, sans-serif;
  --font-mono: 'Roboto Mono', 'IBM Plex Mono', ui-monospace, SFMono-Regular, monospace;

  --header-h: 76px;
  --shell: min(1240px, 92vw);
  --gap: clamp(16px, 2.4vw, 32px);
  --radius: 2px;

  --ease: cubic-bezier(0.22, 0.8, 0.28, 1);
}

/* ---------- 2. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 24px);
}

body {
  margin: 0;
  min-height: 100%;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--paper);
  background-color: var(--ink);
  background-image:
    radial-gradient(58% 42% at 84% 2%, rgba(230, 57, 70, 0.15), transparent 62%),
    radial-gradient(46% 38% at 4% 98%, rgba(244, 185, 66, 0.075), transparent 66%),
    linear-gradient(rgba(255, 255, 255, 0.032) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.032) 1px, transparent 1px);
  background-size: auto, auto, 72px 72px, 72px 72px;
  background-repeat: no-repeat, no-repeat, repeat, repeat;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img, svg, video { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }
ul, ol { margin: 0; padding: 0; list-style: none; }

:focus-visible {
  outline: 2px solid var(--jade);
  outline-offset: 3px;
  border-radius: 0;
}

/* ---------- 3. 中文排版基座 ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.012em;
  color: var(--paper);
  margin: 0 0 0.5em;
  font-stretch: condensed;
}
h1 { font-size: clamp(2rem, 5vw, 3.6rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); }
h3 { font-size: 1.25rem; line-height: 1.25; }
h4 { font-size: 1.0625rem; letter-spacing: 0.02em; }
p { margin: 0 0 1.1em; }
p:last-child { margin-bottom: 0; }

.num, .score, code, kbd, samp, .stat-value, .step-idx, .nav-idx {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

::selection { background: var(--flame); color: var(--paper); }

/* ---------- 4. 布局容器 ---------- */
.shell {
  width: var(--shell);
  margin-inline: auto;
}

#main-content {
  position: relative;
  z-index: 1;
  display: block;
}

.section {
  position: relative;
  padding: clamp(48px, 7vw, 96px) 0;
}
.section--tight { padding: clamp(32px, 4.5vw, 60px) 0; }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px 32px;
  margin-bottom: clamp(26px, 3.6vw, 44px);
}
.section-head > div { max-width: 68ch; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--gold);
}
.eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--flame);
  flex: none;
}

.rule {
  height: 1px;
  border: 0;
  margin: 0;
  background: linear-gradient(90deg, var(--line-strong), transparent 82%);
}

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color 0.22s var(--ease), color 0.22s var(--ease),
              border-color 0.22s var(--ease), transform 0.22s var(--ease);
}
.btn-flame {
  background: var(--flame);
  color: #fff;
  box-shadow: 0 14px 30px -20px rgba(230, 57, 70, 0.95);
}
.btn-flame:hover { background: var(--flame-dark); border-color: var(--gold); }
.btn-ghost {
  background: rgba(255, 255, 255, 0.04);
  border-color: var(--line-strong);
  color: var(--paper);
}
.btn-ghost:hover { border-color: var(--gold); color: var(--gold); }
.btn-gold {
  background: var(--gold);
  color: var(--ink);
}
.btn-gold:hover { background: #ffcf63; }
.btn:active { transform: translateY(1px); }

/* ---------- 6. 页头 ---------- */
.skip-link {
  position: fixed;
  top: -120px;
  left: 16px;
  z-index: 200;
  padding: 12px 20px;
  background: var(--gold);
  color: var(--ink);
  font-weight: 700;
  font-size: 0.9375rem;
  transition: top 0.22s var(--ease);
}
.skip-link:focus { top: 16px; }

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 120;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color 0.35s var(--ease), border-color 0.35s var(--ease),
              box-shadow 0.35s var(--ease);
}
.site-header.is-stuck {
  background: rgba(16, 24, 39, 0.95);
  border-bottom-color: var(--line-strong);
  box-shadow: 0 22px 48px -34px rgba(0, 0, 0, 0.95);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.header-gridline {
  height: 2px;
  background:
    linear-gradient(90deg,
      var(--flame) 0 104px,
      var(--gold) 104px 138px,
      var(--line) 138px 100%);
}

.header-inner {
  width: var(--shell);
  margin-inline: auto;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: none;
}
.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  flex: none;
  background: linear-gradient(140deg, var(--gold) 0%, var(--flame) 78%);
  color: var(--ink);
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 24px;
  line-height: 1;
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.1875rem;
  letter-spacing: 0.01em;
  color: var(--paper);
}
.brand-tagline {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.2em;
  color: var(--gold);
  text-transform: uppercase;
}

/* 移动菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 0 14px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color 0.22s var(--ease), background-color 0.22s var(--ease);
}
.nav-toggle:hover { border-color: var(--gold); }
.nav-toggle-bars {
  display: grid;
  gap: 4px;
  width: 20px;
}
.nav-toggle-bars i {
  display: block;
  height: 2px;
  background: var(--paper);
  transition: transform 0.28s var(--ease), opacity 0.28s var(--ease);
}
.nav-toggle-bars i:nth-child(2) { width: 70%; background: var(--gold); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
.nav-toggle-label {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.12em;
}

/* 主导航 */
.primary-nav {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 24px);
  margin-left: auto;
}
.nav-list { display: flex; align-items: center; gap: 2px; }
.nav-list a {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 12px 11px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--smoke);
  transition: color 0.22s var(--ease);
}
.nav-list a::after {
  content: "";
  position: absolute;
  left: 11px;
  right: 11px;
  bottom: 5px;
  height: 2px;
  background: var(--flame);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.28s var(--ease);
}
.nav-list a:hover,
.nav-list a:focus-visible { color: var(--paper); }
.nav-list a:hover::after,
.nav-list a:focus-visible::after,
.nav-list a[aria-current="page"]::after { transform: scaleX(1); }
.nav-list a[aria-current="page"] { color: var(--paper); font-weight: 600; }
.nav-idx {
  font-size: 0.625rem;
  letter-spacing: 0.06em;
  color: var(--gold);
  opacity: 0.85;
}
.nav-actions { display: flex; align-items: center; gap: 10px; }

/* 阅读进度 */
.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: rgba(255, 255, 255, 0.07);
  overflow: hidden;
  opacity: 0;
  transition: opacity 0.3s var(--ease);
}
.site-header.is-stuck .scroll-progress { opacity: 1; }
.scroll-progress-bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--gold), var(--flame));
}

/* 页头 ≤1040px：抽屉 */
@media (max-width: 1040px) {
  .nav-toggle { display: inline-flex; }
  .primary-nav {
    position: fixed;
    inset: 0;
    z-index: 110;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    margin: 0;
    padding: calc(var(--header-h) + 26px) 20px 40px;
    background: linear-gradient(180deg, #0A101D 0%, var(--panel) 55%, #0A101D 100%);
    border-top: 2px solid var(--flame);
    overflow-y: auto;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: transform 0.4s var(--ease), opacity 0.3s var(--ease), visibility 0.4s;
  }
  .primary-nav[data-open] {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }
  .nav-list { flex-direction: column; align-items: stretch; gap: 0; }
  .nav-list li { border-bottom: 1px solid var(--line); }
  .nav-list a {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 4px;
    font-size: 1.0625rem;
    color: var(--paper);
  }
  .nav-list a::after { display: none; }
  .nav-list a[aria-current="page"] {
    color: var(--gold);
    box-shadow: inset 3px 0 0 var(--flame);
    padding-left: 14px;
  }
  .nav-actions {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    margin-top: 26px;
  }
  .nav-actions .btn { width: 100%; min-height: 48px; }
}

@media (max-width: 520px) {
  .brand-tagline { display: none; }
  .nav-toggle-label { display: none; }
}

/* ---------- 7. 页脚 ---------- */
.site-footer {
  position: relative;
  z-index: 1;
  background: var(--ink-soft);
  border-top: 1px solid var(--line);
  color: var(--smoke);
  font-size: 0.9375rem;
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: min(38vw, 420px);
  height: 2px;
  background: linear-gradient(90deg, var(--flame), var(--gold) 60%, transparent);
}
.footer-inner {
  width: var(--shell);
  margin-inline: auto;
  padding: clamp(42px, 6vw, 76px) 0 30px;
}
.footer-top {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) 2.2fr;
  gap: clamp(28px, 5vw, 64px);
  padding-bottom: clamp(28px, 4vw, 44px);
  border-bottom: 1px solid var(--line);
}
.footer-brand { display: flex; flex-direction: column; align-items: flex-start; }
.footer-mark {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  margin-bottom: 16px;
  background: linear-gradient(140deg, var(--gold) 0%, var(--flame) 78%);
  color: var(--ink);
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 26px;
  line-height: 1;
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
}
.footer-name {
  margin: 0 0 4px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.125rem;
  color: var(--paper);
}
.footer-tagline {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  color: var(--gold);
  text-transform: uppercase;
}
.footer-hours {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--smoke);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 36px);
}
.footer-col-title {
  margin: 0 0 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--gold);
  text-transform: uppercase;
}
.footer-col-list li + li { margin-top: 9px; }
.footer-col-list a {
  color: var(--smoke);
  font-size: 0.9375rem;
  transition: color 0.2s var(--ease), padding-left 0.2s var(--ease);
}
.footer-col-list a:hover {
  color: var(--paper);
  padding-left: 6px;
  box-shadow: inset 2px 0 0 var(--flame);
}

.footer-contact {
  margin: clamp(22px, 3vw, 34px) 0;
  padding: 20px 22px;
  background: linear-gradient(90deg, rgba(230, 57, 70, 0.11), rgba(244, 185, 66, 0.035) 70%, transparent);
  border-left: 2px solid var(--flame);
  font-size: 0.875rem;
  line-height: 1.95;
}
.footer-contact p { margin: 0; }
.footer-contact strong {
  margin-right: 6px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--gold);
}
.footer-contact-note { margin-top: 6px; color: var(--smoke); font-size: 0.8125rem; }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 26px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.78125rem;
  letter-spacing: 0.03em;
}
.footer-icp { margin: 0; color: var(--smoke); }
.footer-copy { margin: 0; color: var(--smoke); }
.footer-legal { display: flex; flex-wrap: wrap; gap: 8px 18px; }
.footer-legal a {
  color: var(--smoke);
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.footer-legal a:hover { color: var(--gold); border-bottom-color: var(--gold); }

@media (max-width: 900px) {
  .footer-top { grid-template-columns: 1fr; }
}
@media (max-width: 620px) {
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px 18px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}

/* ---------- 8. 蓝图网格 / 卡片 / 标签 ---------- */
.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gap);
}
@media (max-width: 900px) {
  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
}
@media (max-width: 560px) {
  .grid-12 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

.panel {
  position: relative;
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.panel--accent { border-left: 2px solid var(--flame); }
.panel--jade { border-left: 2px solid var(--jade); }
.panel--gold { border-left: 2px solid var(--gold); }

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(18px, 2.2vw, 24px);
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0) 62%), var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.26s var(--ease), transform 0.26s var(--ease),
              box-shadow 0.26s var(--ease);
}
.card::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 0;
  height: 2px;
  background: var(--flame);
  transition: width 0.36s var(--ease);
}
.card:hover {
  border-color: var(--line-strong);
  transform: translateY(-3px);
  box-shadow: 0 26px 44px -34px rgba(0, 0, 0, 0.95);
}
.card:hover::after { width: 56px; }
.card-title { margin: 0; font-size: 1.25rem; }
.card-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--smoke);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--smoke);
  white-space: nowrap;
}
.tag-flame { border-color: rgba(230, 57, 70, 0.55); color: var(--flame); }
.tag-gold { border-color: rgba(244, 185, 66, 0.55); color: var(--gold); }
.tag-jade { border-color: rgba(61, 214, 196, 0.5); color: var(--jade); }
.tag-alert { border-color: rgba(255, 122, 69, 0.55); color: var(--alert); }

/* 数据块 */
.stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.03);
  border-left: 2px solid var(--gold);
}
.stat-value {
  font-size: clamp(1.5rem, 3.4vw, 2.25rem);
  font-weight: 600;
  line-height: 1;
  color: var(--paper);
}
.stat-label {
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--smoke);
}

/* ---------- 9. 图片容器 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  margin: 0;
  aspect-ratio: 16 / 9;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s var(--ease);
}
.media-frame::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  z-index: 2;
  width: 26px;
  height: 26px;
  border-left: 2px solid var(--gold);
  border-top: 2px solid var(--gold);
  pointer-events: none;
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(205deg, rgba(230, 57, 70, 0.2) 0%, rgba(8, 11, 18, 0) 58%);
  pointer-events: none;
}
.media-frame:hover img { transform: scale(1.04); }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--wide { aspect-ratio: 21 / 9; }

/* ---------- 10. 正文 ---------- */
.prose {
  max-width: 72ch;
  color: var(--paper);
  font-size: 1.0625rem;
  line-height: 1.78;
}
.prose h2 { margin-top: 1.9em; }
.prose h3 { margin-top: 1.6em; }
.prose ul, .prose ol { margin: 0 0 1.2em; padding-left: 1.2em; }
.prose li { margin-bottom: 0.5em; }
.prose ul li { list-style: square; }
.prose ol li { list-style: decimal; }
.prose a {
  color: var(--jade);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}
.prose a:hover { color: var(--gold); }
.prose strong { color: var(--gold); font-weight: 600; }
.prose blockquote {
  margin: 1.4em 0;
  padding: 4px 0 4px 18px;
  border-left: 2px solid var(--flame);
  color: var(--smoke);
}
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 2.2em 0; }

/* ---------- 11. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  padding: 0;
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 0.78125rem;
  letter-spacing: 0.04em;
  color: var(--smoke);
}
.breadcrumb li { display: flex; align-items: center; }
.breadcrumb li + li::before {
  content: "/";
  margin: 0 10px;
  color: rgba(255, 255, 255, 0.24);
}
.breadcrumb a { color: var(--smoke); transition: color 0.2s var(--ease); }
.breadcrumb a:hover { color: var(--gold); }
.breadcrumb li:last-child { color: var(--paper); }

/* ---------- 12. 折叠组 ---------- */
.accordion {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  overflow: hidden;
}
.accordion-item + .accordion-item { border-top: 1px solid var(--line); }
.accordion-trigger {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 18px 20px;
  background: none;
  border: 0;
  text-align: left;
  font-size: 1rem;
  font-weight: 600;
  color: var(--paper);
  cursor: pointer;
  transition: background-color 0.22s var(--ease), color 0.22s var(--ease);
}
.accordion-trigger:hover { background: rgba(255, 255, 255, 0.035); color: var(--gold); }
.accordion-trigger .idx {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--gold);
  flex: none;
}
.accordion-trigger .sign {
  margin-left: auto;
  flex: none;
  width: 14px;
  height: 14px;
  position: relative;
}
.accordion-trigger .sign::before,
.accordion-trigger .sign::after {
  content: "";
  position: absolute;
  background: var(--flame);
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}
.accordion-trigger .sign::before { left: 0; top: 6px; width: 14px; height: 2px; }
.accordion-trigger .sign::after { left: 6px; top: 0; width: 2px; height: 14px; }
.accordion-item[data-open] .accordion-trigger { color: var(--gold); }
.accordion-item[data-open] .sign::after { transform: scaleY(0); opacity: 0; }
.accordion-panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.34s var(--ease);
}
.accordion-item[data-open] .accordion-panel { grid-template-rows: 1fr; }
.accordion-panel > div {
  overflow: hidden;
  padding: 0 20px;
  color: var(--smoke);
  font-size: 0.9375rem;
  line-height: 1.8;
}
.accordion-item[data-open] .accordion-panel > div { padding-bottom: 20px; }

/* ---------- 13. 步骤 ---------- */
.steps { display: grid; gap: 14px; }
.step {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 16px;
  padding: 16px 18px;
  background: rgba(255, 255, 255, 0.028);
  border: 1px solid var(--line);
  border-left: 2px solid var(--flame);
}
.step-idx {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--gold);
  letter-spacing: 0.06em;
}
.step-body h3 { margin: 0 0 6px; font-size: 1.0625rem; }
.step-body p { margin: 0; color: var(--smoke); font-size: 0.9375rem; }

/* ---------- 14. 显现动画 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.62s var(--ease), transform 0.62s var(--ease);
}
[data-reveal].is-visible { opacity: 1; transform: none; }

/* ---------- 15. 无障碍与降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
}

@media print {
  .site-header, .footer-contact, .scroll-progress { display: none; }
  body { background: #fff; color: #000; }
}