/* =========================================================
   皇冠娱乐 · 共享样式表 /assets/site.css
   夜场通行证：墨黑底 + 暗金细线 + 琥珀金唯一强调色
   ========================================================= */

/* ---------- 1. 变量 ---------- */
:root {
  --ink: #0A0A0C;
  --panel: #16181D;
  --wine: #3B1018;
  --silver: #C6CAD2;
  --dim: #8C939E;
  --gold: #F0B429;
  --gold-dark: #7A5A1E;
  --blue: #33C1F0;
  --cream: #F6EFE0;
  --deep: #0E1418;

  --shell: 1240px;
  --rail-width: 88px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --shadow-hard: 8px 8px 0 rgba(0, 0, 0, 0.55);
  --shadow-hard-hover: 8px 12px 0 rgba(0, 0, 0, 0.62);
  --line-gold: rgba(122, 90, 30, 0.45);

  --font-display: "Songti SC", "STSong", "Source Han Serif SC", "Noto Serif SC", "SimSun", Georgia, serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", "Courier New", monospace;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  background: var(--ink);
}

body {
  margin: 0;
  background: var(--ink);
  color: var(--silver);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.9;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.25;
  color: var(--cream);
  margin: 0 0 0.6em;
}

h1 { font-size: clamp(32px, 5vw, 56px); }
h2 { font-size: clamp(26px, 3.4vw, 40px); }
h3 { font-size: clamp(19px, 2vw, 24px); }
h4 { font-size: 17px; letter-spacing: 0; }

p { margin: 0 0 1.1em; }

ul, ol { margin: 0 0 1.1em; padding-left: 1.2em; }

a { color: var(--blue); text-decoration: none; transition: color 0.2s var(--ease); }
a:hover { color: var(--gold); }

strong { color: var(--cream); font-weight: 700; }

button { font: inherit; color: inherit; }

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

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

.skip-link {
  position: absolute;
  left: 50%;
  top: -120px;
  transform: translateX(-50%);
  z-index: 300;
  padding: 10px 20px;
  background: var(--gold);
  color: var(--ink);
  font-weight: 700;
  letter-spacing: 0.08em;
  border-radius: 2px;
  box-shadow: var(--shadow-hard);
  transition: top 0.2s var(--ease);
}
.skip-link:focus { top: 10px; color: var(--ink); }

/* ---------- 3. 页头 / 居中刊头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: linear-gradient(180deg, #0E1418 0%, #0B0E12 100%);
  border-bottom: 1px solid var(--gold-dark);
  --bar-pad: 20px;
  --brand-size: clamp(26px, 3.4vw, 40px);
}

.site-header.is-condensed {
  --bar-pad: 8px;
  --brand-size: clamp(18px, 1.8vw, 24px);
}

.header-bar {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 16px;
  max-width: var(--shell);
  margin: 0 auto;
  padding: var(--bar-pad) 24px;
  transition: padding 0.24s var(--ease);
}

.header-left {
  grid-column: 1;
  justify-self: start;
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.masthead {
  grid-column: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  min-width: 0;
}

.masthead__brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  text-decoration: none;
}

.masthead__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--brand-size);
  letter-spacing: -0.03em;
  line-height: 1.06;
  color: var(--cream);
  transition: color 0.24s var(--ease), font-size 0.24s var(--ease);
}
.masthead__brand:hover .masthead__name { color: var(--gold); }

.masthead__domain {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--dim);
  transition: opacity 0.2s var(--ease);
}

.masthead__tagline {
  margin: 4px 0 0;
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--gold-dark);
  transition: opacity 0.2s var(--ease);
}

.site-header.is-condensed .masthead__domain,
.site-header.is-condensed .masthead__tagline { display: none; }

.header-tools {
  grid-column: 3;
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.header-tools a,
.header-tools span {
  font-size: 13px;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.tool-link { color: var(--dim); }
.tool-link:hover { color: var(--blue); }

.tool-lang {
  color: var(--gold-dark);
  border-left: 1px solid var(--line-gold);
  padding-left: 14px;
}

a.tool-cta {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  background: var(--gold);
  color: var(--ink);
  font-weight: 700;
  border-radius: 2px;
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.6);
  transition: background-color 0.2s var(--ease), transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
a.tool-cta:hover {
  background: var(--cream);
  color: var(--ink);
  transform: translate(-1px, -1px);
  box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.65);
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: transparent;
  border: 2px solid var(--gold-dark);
  color: var(--gold);
  border-radius: 2px;
  font-size: 13px;
  letter-spacing: 0.16em;
  cursor: pointer;
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}
.nav-toggle:hover { border-color: var(--gold); background: rgba(240, 180, 41, 0.08); }

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: background-color 0.2s var(--ease);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform 0.2s var(--ease), top 0.2s var(--ease);
}
.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { top: 0; transform: rotate(-45deg); }

/* 纵向索引按钮 */
.rail-btn {
  display: none;
  align-items: center;
  padding: 7px 10px;
  background: transparent;
  border: 1px solid var(--gold-dark);
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  border-radius: 2px;
  cursor: pointer;
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}
.rail-btn:hover { border-color: var(--gold); background: rgba(240, 180, 41, 0.08); }

/* 主导航条 */
.site-nav {
  position: relative;
  border-top: 1px solid var(--line-gold);
  background: rgba(22, 24, 29, 0.55);
}

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 2px;
  margin: 0 auto;
  padding: 4px 24px 6px;
  max-width: var(--shell);
  list-style: none;
}

.site-nav__link {
  display: inline-block;
  padding: 8px 14px;
  color: var(--dim);
  font-size: 14px;
  letter-spacing: 0.14em;
  border-radius: 2px;
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.site-nav__link:hover {
  color: var(--blue);
  background: rgba(51, 193, 240, 0.08);
}
.site-nav__link[aria-current="page"] {
  color: var(--gold);
  box-shadow: inset 0 -2px 0 var(--gold);
}

/* 滚动进度线 */
.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--gold) 0%, var(--blue) 100%);
  pointer-events: none;
}

/* 桌面端：侧栏索引模式 */
@media (min-width: 1024px) {
  .site-header.is-condensed .rail-btn { display: inline-flex; }

  .site-header[data-rail="true"] .site-nav {
    position: fixed;
    left: 0;
    top: 118px;
    z-index: 70;
    padding: 10px 6px;
    background: var(--deep);
    border: 2px solid var(--gold-dark);
    border-left: 0;
    box-shadow: var(--shadow-hard);
  }
  .site-header[data-rail="true"] .site-nav__list {
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: 0;
  }
  .site-header[data-rail="true"] .site-nav__link {
    writing-mode: vertical-rl;
    letter-spacing: 0.22em;
    padding: 12px 8px;
    box-shadow: none;
  }
  .site-header[data-rail="true"] .site-nav__link[aria-current="page"] {
    color: var(--gold);
    background: rgba(240, 180, 41, 0.1);
  }
}

/* ---------- 4. 通用版式 ---------- */
.container {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 24px;
}
.container--narrow { max-width: 900px; }

.section { padding: clamp(48px, 7vw, 104px) 0; }
.section--tight { padding: clamp(32px, 4vw, 64px) 0; }

.layout-rail {
  display: grid;
  grid-template-columns: var(--rail-width) minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

.rail-track {
  position: sticky;
  top: 180px;
  align-self: start;
  width: var(--rail-width);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--gold-dark);
  writing-mode: vertical-rl;
}

.prose { max-width: 100%; }
.prose p { max-width: 720px; }

.display-title {
  font-family: var(--font-display);
  font-size: clamp(40px, 7vw, 96px);
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: -0.03em;
  color: var(--cream);
  margin: 0 0 24px;
}

.section-title {
  font-size: clamp(26px, 3.6vw, 44px);
  margin: 0 0 18px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--gold);
}
.eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--gold);
}

.lead {
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.85;
  color: var(--silver);
  max-width: 720px;
}

.muted { color: var(--dim); }
.gold { color: var(--gold); }
.mono {
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  color: var(--gold);
  border-bottom: 1px solid var(--gold-dark);
}

.rule-gold {
  display: block;
  height: 1px;
  border: 0;
  margin: 32px 0;
  background: linear-gradient(90deg, var(--gold-dark) 0%, rgba(122, 90, 30, 0.05) 100%);
}

/* ---------- 5. 网格 ---------- */
.grid { display: grid; gap: 24px; }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid--offset > *:nth-child(even) { margin-top: 32px; }

@media (max-width: 1000px) {
  .grid--3,
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: minmax(0, 1fr); }
  .grid--offset > *:nth-child(even) { margin-top: 0; }
}

/* ---------- 6. 卡片 ---------- */
.card {
  position: relative;
  padding: clamp(20px, 3vw, 32px);
  background: var(--panel);
  border: 2px solid var(--gold-dark);
  box-shadow: var(--shadow-hard);
}
.card--wine {
  background: linear-gradient(160deg, var(--wine) 0%, #240A10 100%);
  border-color: rgba(240, 180, 41, 0.5);
}
.card--flat { box-shadow: none; }

.card__index {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--gold);
}

.card--lift {
  transition: transform 0.24s var(--ease), border-color 0.24s var(--ease), box-shadow 0.24s var(--ease);
}
.card--lift:hover {
  transform: translateY(-4px);
  border-color: var(--gold);
  box-shadow: var(--shadow-hard-hover);
}

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  background: var(--gold);
  border: 2px solid var(--gold);
  color: var(--ink);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
  border-radius: 2px;
  cursor: pointer;
  box-shadow: 5px 5px 0 rgba(0, 0, 0, 0.6);
  transition: transform 0.2s var(--ease), background-color 0.2s var(--ease),
              color 0.2s var(--ease), border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.btn:hover {
  background: var(--cream);
  border-color: var(--cream);
  color: var(--ink);
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 rgba(0, 0, 0, 0.65);
}

.btn--ghost {
  background: transparent;
  border-color: var(--gold-dark);
  color: var(--gold);
}
.btn--ghost:hover {
  background: rgba(240, 180, 41, 0.1);
  border-color: var(--gold);
  color: var(--gold);
}

.btn--sm { padding: 8px 14px; font-size: 13px; }

/* ---------- 8. 面包屑 ---------- */
.breadcrumb {
  padding: 14px 0;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--dim);
}
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.breadcrumb li { display: flex; align-items: center; }
.breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--gold-dark);
}
.breadcrumb a { color: var(--dim); }
.breadcrumb a:hover { color: var(--gold); }
.breadcrumb [aria-current="page"] { color: var(--silver); }

/* ---------- 9. 步骤条 ---------- */
.step {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 20px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line-gold);
}
.step__num {
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1.4;
  color: var(--gold);
  letter-spacing: 0.04em;
}
.step__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 19px;
  color: var(--cream);
}
.step p { margin: 0; color: var(--dim); max-width: 720px; }

@media (max-width: 560px) {
  .step { grid-template-columns: minmax(0, 1fr); gap: 8px; }
}

/* ---------- 10. 折叠面板 ---------- */
.disclosure {
  margin: 0 0 12px;
  background: var(--panel);
  border: 1px solid var(--gold-dark);
}
.disclosure > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 18px;
  color: var(--cream);
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}
.disclosure > summary::-webkit-details-marker { display: none; }
.disclosure > summary::after {
  content: "+";
  font-family: var(--font-mono);
  color: var(--gold);
}
.disclosure[open] > summary::after { content: "\2013"; }
.disclosure__body {
  padding: 0 18px 18px;
  color: var(--dim);
}
.disclosure__body p { max-width: 720px; }

/* ---------- 11. 标签页 ---------- */
.tabs { margin: 0 0 32px; }

.tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin: 0 0 24px;
  border-bottom: 2px solid var(--gold-dark);
}

.tabs__btn {
  position: relative;
  margin-bottom: -2px;
  padding: 12px 20px;
  background: transparent;
  border: 0;
  border-bottom: 2px solid transparent;
  color: var(--dim);
  font-size: 14px;
  letter-spacing: 0.12em;
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}
.tabs__btn:hover {
  color: var(--silver);
  background: rgba(240, 180, 41, 0.06);
}
.tabs__btn[aria-selected="true"] {
  color: var(--gold);
  border-bottom-color: var(--gold);
  background: rgba(240, 180, 41, 0.08);
}

.tabs__panel { animation: tabIn 0.32s var(--ease); }
.tabs__panel[hidden] { display: none; }

@keyframes tabIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 12. 图片容器基础 ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: linear-gradient(160deg, #16181D 0%, #0E1418 58%, #3B1018 140%);
  border: 2px solid var(--gold-dark);
  box-shadow: var(--shadow-hard);
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--portrait { aspect-ratio: 3 / 4; }

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

.media-frame__cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: 12px 16px;
  background: linear-gradient(180deg, rgba(10, 10, 12, 0) 0%, rgba(10, 10, 12, 0.92) 100%);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--dim);
}

.media-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

/* ---------- 13. 进入显现 ---------- */
.reveal-init {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}
.reveal-init.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 14. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 112px);
  background: var(--deep);
  border-top: 1px solid var(--gold-dark);
  color: var(--dim);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 180px;
  height: 2px;
  background: var(--gold);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 32px;
  max-width: var(--shell);
  margin: 0 auto;
  padding: clamp(40px, 6vw, 72px) 24px clamp(28px, 4vw, 48px);
}

.footer-col__title {
  position: relative;
  margin: 0 0 18px;
  padding-left: 14px;
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: 0;
  color: var(--cream);
}
.footer-col__title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 2px;
  height: 14px;
  background: var(--gold);
}

.footer-links {
  margin: 0;
  padding: 0;
  list-style: none;
}
.footer-links li { margin: 0 0 10px; }
.footer-links a {
  color: var(--silver);
  font-size: 14px;
  letter-spacing: 0.04em;
  text-decoration: underline;
  text-decoration-color: rgba(122, 90, 30, 0.6);
  text-underline-offset: 4px;
  transition: color 0.2s var(--ease), text-decoration-color 0.2s var(--ease);
}
.footer-links a:hover {
  color: var(--gold);
  text-decoration-color: var(--gold);
}

.footer-note {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.9;
  color: var(--dim);
}

.footer-contact {
  margin: 0;
  padding: 0;
  list-style: none;
}
.footer-contact li {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin: 0 0 14px;
}
.footer-contact__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--gold-dark);
}
.footer-contact__value {
  font-size: 14px;
  color: var(--silver);
  word-break: break-word;
}

.footer-legal {
  border-top: 1px solid rgba(122, 90, 30, 0.3);
}
.footer-legal__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 18px 24px 24px;
}
.footer-legal__item {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold-dark);
}

/* ---------- 15. 响应式 ---------- */
@media (max-width: 1023px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .layout-rail { grid-template-columns: minmax(0, 1fr); }
  .rail-track { display: none; }
}

@media (max-width: 899px) {
  .header-bar {
    grid-template-columns: minmax(0, 1fr);
    justify-items: center;
    gap: 0;
  }
  .header-left {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    grid-column: 1;
    justify-self: start;
  }
  .masthead { grid-column: 1; }
  .header-tools { display: none; }
  .nav-toggle { display: inline-flex; }
  .rail-btn { display: none; }

  .site-nav {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background: var(--deep);
    border-top: 1px solid var(--gold-dark);
    border-bottom: 2px solid var(--gold-dark);
    box-shadow: 0 18px 0 -6px rgba(0, 0, 0, 0.6);
  }
  .site-nav[data-open] { display: block; }
  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    padding: 12px;
  }
  .site-nav__link {
    padding: 14px 16px;
    font-size: 16px;
    letter-spacing: 0.08em;
    border-bottom: 1px solid rgba(122, 90, 30, 0.25);
  }
  .site-nav__link[aria-current="page"] {
    box-shadow: inset 3px 0 0 var(--gold);
    background: rgba(240, 180, 41, 0.08);
  }

  .masthead__tagline { letter-spacing: 0.2em; }

  .footer-legal__inner { justify-content: flex-start; }
}

@media (max-width: 640px) {
  body { font-size: 15px; }
  .container { padding: 0 18px; }
  .footer-grid { grid-template-columns: minmax(0, 1fr); padding-left: 18px; padding-right: 18px; }
  .footer-legal__inner { padding-left: 18px; padding-right: 18px; }
  .tabs__list { border-bottom-width: 1px; }
  .tabs__btn { padding: 10px 14px; font-size: 13px; }
}

/* ---------- 16. 动效降级 ---------- */
@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;
  }

  .reveal-init {
    opacity: 1;
    transform: none;
  }

  .card--lift:hover,
  .btn:hover,
  a.tool-cta:hover { transform: none; }
}