/* ============================================================
   永利登录 · 共享样式表 /assets/site.css
   内容：reset、色彩与排版变量、共享头部与页脚、通用组件
   ============================================================ */

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

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

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

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

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

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

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

html.yl-nav-open { overflow: hidden; }

:focus-visible {
  outline: 2px solid #F3D98A;
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 变量 ---------- */
:root {
  --yl-deep: #0B1E33;
  --yl-deep-2: #123A5E;
  --yl-tide: #1E5A8A;
  --yl-gold: #E2B33C;
  --yl-gold-soft: #F3D98A;
  --yl-celadon: #6F9E88;
  --yl-clay: #C4735A;
  --yl-rock: #4A5560;
  --yl-rock-soft: #8C949C;
  --yl-paper: #F6F1E7;
  --yl-ink: #0B1E33;

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

  --yl-radius-sm: 6px;
  --yl-radius: 14px;
  --yl-radius-lg: 28px;

  --yl-line: rgba(140, 148, 156, 0.28);
  --yl-line-gold: rgba(226, 179, 60, 0.5);
  --yl-text-soft: rgba(246, 241, 231, 0.76);
  --yl-text-faint: rgba(246, 241, 231, 0.56);

  --yl-shell: 1280px;
  --yl-gutter: clamp(20px, 5vw, 88px);
  --yl-ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 基础排版 ---------- */
body {
  font-family: var(--yl-font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.9;
  min-height: 100vh;
  color: var(--yl-paper);
  background-color: var(--yl-deep);
  background-image:
    radial-gradient(1100px 620px at 78% -10%, rgba(30, 90, 138, 0.55), transparent 62%),
    radial-gradient(900px 520px at 4% 8%, rgba(226, 179, 60, 0.1), transparent 60%);
  background-repeat: no-repeat;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-weight: 800;
  letter-spacing: 0.04em;
  line-height: 1.18;
  color: var(--yl-paper);
}

h1 { font-size: clamp(30px, 5vw, 62px); }
h2 { font-size: clamp(22px, 2.8vw, 36px); }
h3 { font-size: clamp(18px, 1.8vw, 23px); }

p { font-size: 16px; }

.yl-mono {
  font-family: var(--yl-font-mono);
  letter-spacing: 0.02em;
  font-feature-settings: "tnum" 1;
}

.yl-note {
  font-size: 13px;
  line-height: 1.85;
  letter-spacing: 0.04em;
  color: var(--yl-text-faint);
}

/* ---------- 跳转链接 ---------- */
.yl-skip {
  position: fixed;
  top: -80px;
  left: 18px;
  z-index: 200;
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #1B1305;
  background: linear-gradient(120deg, var(--yl-gold-soft), var(--yl-gold));
  box-shadow: 0 10px 26px rgba(226, 179, 60, 0.35);
  transition: top 0.24s var(--yl-ease);
}

.yl-skip:focus { top: 14px; }

/* ---------- 容器 ---------- */
.yl-shell {
  width: min(var(--yl-shell), 100% - var(--yl-gutter));
  margin-inline: auto;
}

/* ---------- 头部 ---------- */
.yl-header {
  position: sticky;
  top: 0;
  z-index: 80;
  color: var(--yl-paper);
  background: linear-gradient(180deg, rgba(11, 30, 51, 0.97), rgba(11, 30, 51, 0.88));
  border-bottom: 1px solid var(--yl-line);
  backdrop-filter: blur(10px);
}

.yl-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(12px, 2vw, 34px);
  padding-block: clamp(12px, 1.6vw, 20px);
  transition: padding-block 0.32s var(--yl-ease);
}

.yl-header[data-scrolled] .yl-header__inner { padding-block: 8px; }

.yl-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: rgba(30, 90, 138, 0.4);
}

.yl-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--yl-tide), var(--yl-gold));
  box-shadow: 0 0 12px rgba(226, 179, 60, 0.6);
}

/* 品牌 */
.yl-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.yl-brand__link {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.yl-brand__beacon {
  position: relative;
  flex: none;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 45%, var(--yl-gold-soft), var(--yl-gold) 44%, rgba(226, 179, 60, 0) 74%);
  box-shadow: 0 0 0 1px rgba(226, 179, 60, 0.45), 0 0 22px rgba(226, 179, 60, 0.35);
}

.yl-brand__beacon::after {
  content: "";
  position: absolute;
  inset: -7px;
  border: 1px dashed rgba(226, 179, 60, 0.35);
  border-radius: 50%;
}

.yl-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
  min-width: 0;
}

.yl-brand__name {
  font-size: clamp(16px, 1.5vw, 19px);
  font-weight: 800;
  letter-spacing: 0.16em;
  color: var(--yl-paper);
}

.yl-brand__tagline {
  font-family: var(--yl-font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--yl-rock-soft);
}

.yl-brand__index {
  font-family: var(--yl-font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--yl-gold);
  padding-left: 14px;
  border-left: 1px solid var(--yl-line);
}

/* 导航 */
.yl-nav {
  display: flex;
  flex: 1;
  align-items: center;
  justify-content: flex-end;
  gap: clamp(14px, 2.4vw, 42px);
}

.yl-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(6px, 1.4vw, 22px);
}

.yl-nav__link {
  position: relative;
  display: inline-block;
  padding: 6px 2px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--yl-text-soft);
  transition: color 0.25s var(--yl-ease);
}

.yl-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--yl-gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--yl-ease);
}

.yl-nav__link:hover { color: var(--yl-gold-soft); }
.yl-nav__link:hover::after { transform: scaleX(1); }

.yl-nav__link[aria-current="page"] { color: var(--yl-gold); }
.yl-nav__link[aria-current="page"]::after { transform: scaleX(1); }

.yl-nav__link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: -11px;
  top: 50%;
  width: 5px;
  height: 5px;
  margin-top: -2px;
  border-radius: 50%;
  background: var(--yl-gold);
  box-shadow: 0 0 10px rgba(226, 179, 60, 0.85);
}

.yl-nav__actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* 移动开关 */
.yl-nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 15px;
  border: 1px solid var(--yl-line);
  border-radius: 999px;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--yl-paper);
}

.yl-nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 16px;
  height: 14px;
}

.yl-nav-toggle__bars span {
  display: block;
  height: 2px;
  background: var(--yl-gold);
  transition: transform 0.3s var(--yl-ease);
}

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

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

/* ---------- 按钮 ---------- */
.yl-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  white-space: nowrap;
  transition: transform 0.25s var(--yl-ease), background-color 0.25s var(--yl-ease),
    color 0.25s var(--yl-ease), border-color 0.25s var(--yl-ease), box-shadow 0.25s var(--yl-ease);
}

.yl-btn--gold {
  color: #1B1305;
  background: linear-gradient(120deg, var(--yl-gold-soft), var(--yl-gold));
  box-shadow: 0 8px 24px rgba(226, 179, 60, 0.22);
}

.yl-btn--gold:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(226, 179, 60, 0.34);
}

.yl-btn--ghost {
  color: var(--yl-gold-soft);
  border-color: rgba(226, 179, 60, 0.45);
  background: rgba(30, 90, 138, 0.18);
}

.yl-btn--ghost:hover {
  color: var(--yl-paper);
  border-color: var(--yl-gold);
  background: rgba(30, 90, 138, 0.4);
}

.yl-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

/* ---------- 页脚 ---------- */
.yl-footer {
  position: relative;
  margin-top: clamp(56px, 8vw, 120px);
  padding-top: clamp(48px, 6vw, 88px);
  color: var(--yl-text-soft);
  background: linear-gradient(180deg, var(--yl-deep) 0%, #071626 100%);
  border-top: 1px solid var(--yl-line);
}

.yl-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background-image:
    repeating-linear-gradient(90deg, rgba(226, 179, 60, 0.55) 0 1px, transparent 1px 72px),
    linear-gradient(90deg, rgba(111, 158, 136, 0.35), transparent 60%);
}

.yl-footer__inner {
  display: grid;
  grid-template-columns: minmax(200px, 1fr) minmax(280px, 1.9fr) minmax(240px, 1.1fr);
  gap: clamp(28px, 4vw, 64px);
  padding-bottom: clamp(36px, 5vw, 64px);
}

.yl-footer__name {
  display: inline-block;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.16em;
  color: var(--yl-paper);
}

.yl-footer__name:hover { color: var(--yl-gold); }

.yl-footer__tagline {
  margin-top: 10px;
  font-family: var(--yl-font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--yl-gold);
}

.yl-footer__region {
  margin-top: 8px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--yl-rock-soft);
}

.yl-footer__cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 40px);
}

.yl-footer__coltitle {
  position: relative;
  padding-bottom: 12px;
  margin-bottom: 14px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--yl-paper);
}

.yl-footer__coltitle::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 26px;
  height: 1px;
  background: var(--yl-gold);
}

.yl-footer__list li {
  position: relative;
  padding-left: 14px;
  font-size: 13.5px;
  line-height: 2;
  color: var(--yl-text-soft);
}

.yl-footer__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.95em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--yl-celadon);
}

.yl-footer__contact {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: clamp(18px, 2vw, 26px);
  border: 1px solid var(--yl-line);
  border-radius: var(--yl-radius);
  background: rgba(18, 58, 94, 0.32);
}

.yl-footer__line {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.yl-footer__label {
  font-family: var(--yl-font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--yl-rock-soft);
}

.yl-footer__value {
  font-family: var(--yl-font-mono);
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--yl-paper);
}

.yl-footer__value--address {
  font-family: var(--yl-font-body);
  font-size: 13.5px;
  line-height: 1.8;
}

.yl-footer__note {
  padding-top: 14px;
  border-top: 1px dashed var(--yl-line);
  font-size: 12.5px;
  line-height: 1.85;
  color: var(--yl-rock-soft);
}

.yl-footer__base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 26px;
  padding-block: 20px;
  border-top: 1px solid var(--yl-line);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--yl-rock-soft);
}

.yl-footer__legal {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.yl-footer__legal a {
  color: var(--yl-text-soft);
  border-bottom: 1px solid transparent;
  transition: color 0.25s var(--yl-ease), border-color 0.25s var(--yl-ease);
}

.yl-footer__legal a:hover {
  color: var(--yl-gold);
  border-color: var(--yl-gold);
}

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

.yl-footer__copy {
  margin-left: auto;
  font-family: var(--yl-font-mono);
}

/* ---------- 分区与容器组件 ---------- */
.yl-section {
  position: relative;
  padding-block: clamp(56px, 8vw, 120px);
}

.yl-section--deep { background: var(--yl-deep); }

.yl-section--deep2 {
  background: linear-gradient(180deg, var(--yl-deep) 0%, var(--yl-deep-2) 100%);
}

.yl-section--paper {
  color: var(--yl-ink);
  background: var(--yl-paper);
  --yl-line: rgba(74, 85, 96, 0.22);
  --yl-text-soft: rgba(11, 30, 51, 0.78);
  --yl-text-faint: rgba(11, 30, 51, 0.58);
}

.yl-section--paper :is(h1, h2, h3, h4) { color: var(--yl-ink); }
.yl-section--paper .yl-lede { color: rgba(11, 30, 51, 0.78); }
.yl-section--paper .yl-tag { color: rgba(11, 30, 51, 0.75); border-color: rgba(11, 30, 51, 0.24); }
.yl-section--paper .yl-tag--gold { color: #8A6612; border-color: rgba(226, 179, 60, 0.6); }
.yl-section--paper .yl-tag--green { color: #3F6B57; border-color: rgba(111, 158, 136, 0.6); }
.yl-section--paper .yl-tag--clay { color: #98503B; border-color: rgba(196, 115, 90, 0.6); }
.yl-section--paper .yl-note { color: rgba(11, 30, 51, 0.6); }
.yl-section--paper .yl-card {
  color: var(--yl-ink);
  background: #FFFCF5;
  border-color: rgba(74, 85, 96, 0.2);
}
.yl-section--paper .yl-card__text { color: rgba(11, 30, 51, 0.72); }

/* ---------- 标题体系 ---------- */
.yl-display {
  font-size: clamp(28px, 7vw, 64px);
  font-weight: 900;
  letter-spacing: 0.04em;
  line-height: 1.1;
}

.yl-display--lg {
  font-size: clamp(40px, 9vw, 110px);
  font-weight: 900;
  letter-spacing: 0.05em;
  line-height: 1;
}

.yl-eyebrow {
  display: inline-block;
  font-family: var(--yl-font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--yl-gold);
}

.yl-lede {
  font-size: clamp(16px, 1.4vw, 19px);
  line-height: 1.95;
  max-width: 38ch;
  color: var(--yl-text-soft);
}

.yl-chapter {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: start;
  gap: 6px clamp(14px, 2vw, 26px);
  margin-bottom: clamp(20px, 3vw, 38px);
}

.yl-chapter__num {
  grid-row: 1;
  font-family: var(--yl-font-mono);
  font-size: clamp(24px, 3.2vw, 46px);
  font-weight: 500;
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--yl-gold);
  transition: color 0.3s var(--yl-ease), text-shadow 0.3s var(--yl-ease);
}

.yl-chapter__title {
  font-size: clamp(20px, 2.6vw, 34px);
  font-weight: 800;
  letter-spacing: 0.04em;
}

.yl-chapter__note {
  grid-column: 2;
  font-size: 14px;
  color: var(--yl-text-faint);
}

.yl-chapter[data-chapter].is-current .yl-chapter__num {
  color: var(--yl-gold-soft);
  text-shadow: 0 0 20px rgba(226, 179, 60, 0.55);
}

.yl-chapter[data-chapter].is-current .yl-chapter__title { color: #FFFFFF; }

/* ---------- 秩序工具 ---------- */
.yl-rule {
  height: 1px;
  border: 0;
  margin-block: clamp(24px, 4vw, 56px);
  background: var(--yl-line);
}

.yl-rule--ticks {
  height: 10px;
  border-top: 1px solid var(--yl-line);
  background-color: transparent;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(226, 179, 60, 0.5) 0 1px,
    transparent 1px 72px
  );
}

.yl-grid {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
}

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

/* ---------- 卡片与标签 ---------- */
.yl-card {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 2.4vw, 32px);
  border: 1px solid var(--yl-line);
  border-radius: var(--yl-radius);
  background: linear-gradient(160deg, rgba(18, 58, 94, 0.55), rgba(11, 30, 51, 0.35));
}

.yl-card__title {
  margin-bottom: 10px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.yl-card__text {
  font-size: 14px;
  line-height: 1.9;
  color: var(--yl-text-soft);
}

.yl-card--gold { border-color: rgba(226, 179, 60, 0.42); }

.yl-card--paper {
  color: var(--yl-ink);
  background: var(--yl-paper);
  border-color: rgba(74, 85, 96, 0.2);
}

.yl-card--paper .yl-card__text { color: rgba(11, 30, 51, 0.72); }

.yl-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border: 1px solid var(--yl-line);
  border-radius: 999px;
  font-family: var(--yl-font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--yl-text-soft);
}

.yl-tag--gold { color: var(--yl-gold); border-color: rgba(226, 179, 60, 0.55); }
.yl-tag--green { color: var(--yl-celadon); border-color: rgba(111, 158, 136, 0.6); }
.yl-tag--clay { color: var(--yl-clay); border-color: rgba(196, 115, 90, 0.65); }

/* ---------- 面包屑 ---------- */
.yl-breadcrumb { margin-block: clamp(16px, 2vw, 28px); }

.yl-breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--yl-font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--yl-rock-soft);
}

.yl-breadcrumb__list li { display: flex; align-items: center; gap: 8px; }

.yl-breadcrumb__list li + li::before {
  content: "/";
  color: rgba(226, 179, 60, 0.6);
}

.yl-breadcrumb a:hover { color: var(--yl-gold); }

/* ---------- 图像容器（页面阶段放入 img 与 alt） ---------- */
.yl-figure {
  position: relative;
  overflow: hidden;
  min-height: clamp(180px, 30vw, 420px);
  border: 1px solid var(--yl-line);
  border-radius: var(--yl-radius-lg);
  background:
    radial-gradient(120% 90% at 78% 12%, rgba(30, 90, 138, 0.55), transparent 60%),
    linear-gradient(150deg, var(--yl-deep-2), var(--yl-deep));
  isolation: isolate;
}

.yl-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(11, 30, 51, 0.06), rgba(11, 30, 51, 0.55));
}

.yl-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  background: var(--yl-deep-2);
}

.yl-figure--wide { aspect-ratio: 16 / 9; }
.yl-figure--band { aspect-ratio: 2 / 1; }
.yl-figure--portrait { aspect-ratio: 3 / 4; }
.yl-figure--tall { aspect-ratio: 2 / 3; }
.yl-figure--square { aspect-ratio: 1 / 1; }

.yl-figure__caption {
  margin-top: 12px;
  font-family: var(--yl-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--yl-rock-soft);
}

/* ---------- 显现动效 ---------- */
.yl-reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.42s var(--yl-ease), transform 0.42s var(--yl-ease);
}

.yl-reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 响应式：平板 ---------- */
@media (max-width: 1080px) {
  .yl-footer__inner {
    grid-template-columns: minmax(200px, 1fr) minmax(260px, 1.6fr);
  }

  .yl-footer__contact { grid-column: 1 / -1; }
}

@media (max-width: 960px) {
  .yl-grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .yl-grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* ---------- 响应式：移动导航 ---------- */
@media (max-width: 900px) {
  .yl-nav-toggle { display: inline-flex; }
  .yl-brand__index { display: none; }

  .yl-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    max-height: calc(100vh - 60px);
    overflow-y: auto;
    padding: 0 var(--yl-gutter);
    border-bottom: 1px solid var(--yl-line);
    background: linear-gradient(180deg, rgba(11, 30, 51, 0.99), rgba(18, 58, 94, 0.99));
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    pointer-events: none;
    transition: opacity 0.28s var(--yl-ease), transform 0.28s var(--yl-ease), visibility 0.28s;
  }

  .yl-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: none;
    pointer-events: auto;
    padding-bottom: 24px;
  }

  .yl-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-block: 6px;
  }

  .yl-nav__link {
    display: block;
    padding: 15px 0;
    border-bottom: 1px solid var(--yl-line);
    font-size: 17px;
    letter-spacing: 0.08em;
  }

  .yl-nav__link::after { display: none; }

  .yl-nav__link[aria-current="page"] { padding-left: 18px; }
  .yl-nav__link[aria-current="page"]::before { left: 0; }

  .yl-nav__actions {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    padding-top: 18px;
  }

  .yl-nav__actions .yl-btn { width: 100%; }
}

/* ---------- 响应式：手机 ---------- */
@media (max-width: 640px) {
  body { font-size: 15.5px; }

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

  .yl-footer__inner { grid-template-columns: minmax(0, 1fr); }
  .yl-footer__cols { grid-template-columns: minmax(0, 1fr); }
  .yl-footer__copy { margin-left: 0; }
  .yl-chapter { grid-template-columns: auto 1fr; }
  .yl-figure { min-height: 200px; border-radius: var(--yl-radius); }
}

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

  .yl-reveal { opacity: 1; transform: none; }
  .yl-progress__bar { transition: none; }
}