/* 芊洲AI 子站共用皮肤 —— 暖白纸感 · 宋体编辑式
   通过 body.theme-ent / body.theme-per 切换主色（企业=墨蓝，个人=赭橙）。 */

:root {
  --paper: #f6f3ec;
  --paper-2: #efe9dd;
  --card: #fffdf8;
  --ink: #17130d;
  --ink-soft: #6b6357;
  --ink-mute: #8b8377;
  --hair: rgba(23, 19, 13, 0.12);
  --hair-strong: rgba(23, 19, 13, 0.22);
  --serif: "Songti SC", "STSong", "Noto Serif CJK SC", "Source Han Serif SC", "SimSun", serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --max: 1160px;
  --header-h: 76px;
  /* 默认（企业）主色 */
  --accent: #1f3d5c;
  --accent-2: #2f5680;
  --accent-tint: #eef2f6;
  --accent-shadow: rgba(31, 61, 92, 0.24);
}

body.theme-per {
  --accent: #b4551f;
  --accent-2: #cd6a2e;
  --accent-tint: #f6efe6;
  --accent-shadow: rgba(180, 85, 31, 0.24);
}

* {
  box-sizing: border-box;
}

/* hidden 属性始终生效（组件的 display 不得覆盖 JS 控制的隐藏态） */
[hidden] {
  display: none !important;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 24px);
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--paper);
  color: var(--ink-soft);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

body.menu-open {
  overflow: hidden;
}

::selection {
  background: var(--accent-tint);
  color: var(--ink);
}

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

button {
  font: inherit;
}

.grain {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(120% 90% at 50% 0%, rgba(255, 255, 255, 0.5), transparent 55%),
    radial-gradient(120% 120% at 50% 120%, rgba(23, 19, 13, 0.05), transparent 60%);
}

.skip-link {
  position: fixed;
  left: 16px;
  top: -60px;
  z-index: 200;
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--ink);
  color: var(--paper);
  font-size: 14px;
  transition: top 160ms var(--ease);
}

.skip-link:focus {
  top: 16px;
}

.wrap {
  width: min(100% - 44px, var(--max));
  margin: 0 auto;
}

.section {
  position: relative;
  z-index: 1;
  padding: clamp(72px, 9vw, 132px) 0;
}

/* ---------- 顶栏 ---------- */

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: var(--header-h);
  border-bottom: 1px solid transparent;
  transition: background 240ms var(--ease), border-color 240ms var(--ease), backdrop-filter 240ms var(--ease);
}

/* 近实色 + 细描边 + 轻投影，替代毛玻璃：手机滚动更跟手 */
.site-header.is-scrolled,
.site-header.menu-active {
  background: rgba(246, 243, 236, 0.95);
  border-color: var(--hair);
  box-shadow: 0 6px 24px rgba(23, 19, 13, 0.05);
}

.nav-shell {
  width: min(100% - 44px, var(--max));
  height: var(--header-h);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
}

.brand img {
  width: 34px;
  height: 34px;
  border-radius: 10px;
}

.brand b {
  font-family: var(--serif);
  font-size: 21px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.02em;
}

.brand b i {
  font-style: italic;
  color: var(--accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 14.5px;
  color: var(--ink-soft);
}

.nav-links a {
  position: relative;
  padding: 4px 0;
  transition: color 200ms var(--ease);
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: -2px;
  height: 1px;
  background: var(--accent);
  transition: right 260ms var(--ease);
}

.nav-links a:hover {
  color: var(--ink);
}

.nav-links a:hover::after {
  right: 0;
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  box-shadow: 0 10px 24px var(--accent-shadow);
  transition: transform 200ms var(--ease), box-shadow 200ms var(--ease);
}

.nav-cta:hover {
  transform: translateY(-1px);
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--hair-strong);
  border-radius: 12px;
  background: var(--card);
  color: var(--ink);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
}

.menu-toggle span {
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background: currentColor;
  transition: transform 180ms var(--ease), opacity 180ms var(--ease);
}

.site-header.menu-active .menu-toggle span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.site-header.menu-active .menu-toggle span:nth-child(2) {
  opacity: 0;
}

.site-header.menu-active .menu-toggle span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.mobile-menu {
  display: none;
}

/* ---------- 通用排版 ---------- */

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--accent);
}

.eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: currentColor;
  opacity: 0.6;
}

.section-head {
  max-width: 720px;
  margin: 0 auto clamp(44px, 6vw, 72px);
  text-align: center;
}

.section-head.left {
  margin-left: 0;
  text-align: left;
}

.section-head .eyebrow::after {
  content: "";
  width: 28px;
  height: 1px;
  background: currentColor;
  opacity: 0.6;
}

.section-head.left .eyebrow::after {
  display: none;
}

h1,
h2,
h3 {
  margin: 0;
  color: var(--ink);
  font-family: var(--serif);
  font-weight: 600;
}

.section-head h2 {
  font-size: clamp(30px, 4.4vw, 50px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  margin-bottom: 16px;
}

.section-head p {
  margin: 0;
  font-size: 17px;
  color: var(--ink-soft);
}

.section-head em {
  font-style: italic;
  color: var(--accent);
}

/* ---------- 按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 52px;
  padding: 14px 28px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 15.5px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 220ms var(--ease), box-shadow 220ms var(--ease), background 220ms var(--ease), border-color 220ms var(--ease), color 220ms var(--ease);
}

.btn svg {
  width: 17px;
  height: 17px;
  transition: transform 260ms var(--ease);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 12px 30px var(--accent-shadow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 40px var(--accent-shadow);
}

.btn-primary:hover svg {
  transform: translate(3px, -3px);
}

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

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ---------- Hero ---------- */

.hero {
  position: relative;
  padding: calc(var(--header-h) + clamp(64px, 12vh, 132px)) 0 clamp(72px, 10vw, 128px);
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    linear-gradient(180deg, var(--accent-tint), transparent 46%),
    radial-gradient(90% 60% at 84% 8%, var(--accent-tint), transparent 60%);
  opacity: 0.9;
  pointer-events: none;
}

.hero .wrap {
  position: relative;
  z-index: 1;
}

.hero-ghost {
  position: absolute;
  right: -0.04em;
  bottom: -0.16em;
  z-index: 0;
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(150px, 24vw, 380px);
  line-height: 0.8;
  color: var(--ink);
  opacity: 0.04;
  pointer-events: none;
  user-select: none;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 26px;
  padding: 8px 18px;
  border: 1px solid var(--hair);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.6);
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ink);
}

.hero-badge::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
}

.hero h1 {
  max-width: 16ch;
  font-size: clamp(42px, 7vw, 88px);
  line-height: 1.04;
  letter-spacing: -0.015em;
  margin-bottom: 26px;
}

.hero h1 em {
  font-style: italic;
  color: var(--accent);
}

.hero-sub {
  max-width: 46ch;
  margin: 0 0 38px;
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.85;
  color: var(--ink-soft);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.hero-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 26px;
  font-size: 13.5px;
  color: var(--ink-mute);
  transition: color 200ms var(--ease);
}

.hero-back:hover {
  color: var(--accent);
}

/* ---------- 数据带 ---------- */

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--hair);
  border-bottom: 1px solid var(--hair);
}

.stat {
  padding: clamp(28px, 4vw, 44px) clamp(18px, 2.4vw, 32px);
  border-left: 1px solid var(--hair);
}

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

.stat strong {
  display: block;
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(40px, 5vw, 66px);
  line-height: 1;
  color: var(--accent);
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
}

.stat span {
  display: block;
  margin-top: 12px;
  font-size: 14px;
  color: var(--ink-soft);
  letter-spacing: 0.04em;
}

/* ---------- 卡片网格 ---------- */

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.card {
  position: relative;
  padding: clamp(26px, 3vw, 38px);
  border: 1px solid var(--hair);
  border-radius: 20px;
  background: var(--card);
  box-shadow: 0 16px 40px rgba(23, 19, 13, 0.05);
  overflow: hidden;
  transition: transform 300ms var(--ease), box-shadow 300ms var(--ease), border-color 300ms var(--ease);
}

@media (hover: hover) and (pointer: fine) {
  .card.hoverable:hover {
    transform: translateY(-6px);
    box-shadow: 0 28px 56px rgba(23, 19, 13, 0.1);
    border-color: var(--hair-strong);
  }
}

.card.feature {
  background: var(--accent-tint);
  border-color: color-mix(in srgb, var(--accent) 32%, var(--hair));
}

.ribbon {
  position: absolute;
  top: 22px;
  right: 22px;
  padding: 6px 13px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-size: 12.5px;
  font-weight: 600;
}

.card-icon {
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  margin-bottom: 24px;
  border-radius: 15px;
  border: 1px solid color-mix(in srgb, var(--accent) 26%, transparent);
  background: color-mix(in srgb, var(--accent) 8%, var(--card));
  color: var(--accent);
}

.card-icon svg {
  width: 27px;
  height: 27px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.card h3 {
  font-size: 23px;
  line-height: 1.3;
  margin-bottom: 10px;
}

.card > p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 16px;
}

.card ul {
  margin: 22px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--hair);
  list-style: none;
  display: grid;
  gap: 12px;
}

.card li {
  position: relative;
  padding-left: 22px;
  font-size: 14.8px;
  color: var(--ink-soft);
  line-height: 1.6;
}

.card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.card-num {
  position: absolute;
  right: 22px;
  top: 6px;
  font-family: var(--serif);
  font-size: 74px;
  font-weight: 600;
  line-height: 1;
  color: var(--accent);
  opacity: 0.12;
  pointer-events: none;
}

.reason strong {
  display: block;
  margin-bottom: 12px;
  font-family: var(--serif);
  font-size: 24px;
  font-weight: 600;
  color: var(--ink);
}

.reason p {
  margin: 0;
  font-size: 15px;
}

/* ---------- 时间轴 ---------- */

.timeline {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 8%;
  right: 8%;
  top: 34px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--hair-strong), transparent);
}

.step {
  position: relative;
  padding-top: 88px;
}

.step .num {
  position: absolute;
  left: 0;
  top: 0;
  display: grid;
  place-items: center;
  width: 68px;
  height: 68px;
  border-radius: 50%;
  background: var(--card);
  border: 1px solid var(--hair-strong);
  font-family: var(--serif);
  font-weight: 600;
  font-size: 22px;
  color: var(--accent);
  box-shadow: 0 10px 24px rgba(23, 19, 13, 0.06);
}

.step h3 {
  font-size: 22px;
  margin-bottom: 8px;
}

.step p {
  margin: 0;
  max-width: 24ch;
  font-size: 15px;
}

/* ---------- 关于 ---------- */

.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.04fr) minmax(320px, 0.96fr);
  gap: 56px;
  align-items: center;
}

.about-copy p {
  font-size: 17px;
  line-height: 2;
  color: var(--ink-soft);
}

.about-copy p strong {
  color: var(--ink);
}

.about-visual {
  min-height: 360px;
  border-radius: 20px;
  border: 1px solid var(--hair);
  background:
    linear-gradient(180deg, var(--card), var(--accent-tint)),
    var(--card);
  display: grid;
  place-items: center;
  box-shadow: 0 16px 40px rgba(23, 19, 13, 0.05);
  overflow: hidden;
}

.about-visual svg {
  width: min(90%, 520px);
  height: auto;
}

/* ---------- 联系 ---------- */

.contact-card {
  max-width: 960px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 200px 1fr;
  align-items: center;
  gap: 28px;
  padding: clamp(28px, 4vw, 44px);
  border-radius: 24px;
  background: var(--accent-tint);
  border: 1px solid color-mix(in srgb, var(--accent) 24%, var(--hair));
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 15px;
  padding: 14px;
  border-radius: 14px;
  transition: background 200ms var(--ease);
}

.contact-item:hover {
  background: rgba(255, 255, 255, 0.6);
}

.contact-item .ic {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  flex: 0 0 auto;
  border-radius: 13px;
  border: 1px solid color-mix(in srgb, var(--accent) 26%, transparent);
  background: var(--card);
  color: var(--accent);
}

.contact-item .ic svg {
  width: 24px;
  height: 24px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.contact-item small {
  display: block;
  font-size: 12.5px;
  color: var(--ink-mute);
  letter-spacing: 0.08em;
}

.contact-item strong {
  display: block;
  font-size: 17px;
  color: var(--ink);
  overflow-wrap: anywhere;
}

.qr {
  display: grid;
  place-items: center;
  gap: 10px;
  width: 150px;
  height: 150px;
  margin: 0 auto;
  border: 1px dashed color-mix(in srgb, var(--accent) 50%, transparent);
  border-radius: 16px;
  background: var(--card);
  color: var(--ink-soft);
  font-size: 14px;
  text-align: center;
}

.qr .glyph {
  width: 40px;
  height: 40px;
  border-radius: 9px;
  border: 1px solid color-mix(in srgb, var(--accent) 55%, transparent);
  background:
    linear-gradient(90deg, var(--accent) 0 8px, transparent 8px 14px, var(--accent-2) 14px 22px, transparent 22px),
    linear-gradient(var(--accent) 0 8px, transparent 8px 14px, var(--accent-2) 14px 22px, transparent 22px);
  opacity: 0.8;
}

/* ---------- 页脚 ---------- */

.site-footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--hair);
  background: var(--paper-2);
  padding: 40px 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(240px, 1fr) auto minmax(240px, 1fr);
  gap: 24px;
  align-items: center;
}

.footer-grid .brand b {
  font-size: 19px;
}

.footer-grid p {
  margin: 10px 0 0;
  font-size: 13.5px;
  color: var(--ink-mute);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 18px;
  font-size: 14px;
  color: var(--ink-soft);
}

.footer-links a:hover {
  color: var(--accent);
}

.footer-record {
  text-align: right;
  font-size: 13.5px;
  color: var(--ink-mute);
}

.footer-record a:hover {
  color: var(--accent);
}

/* ---------- 滚动入场 ---------- */

.reveal {
  opacity: 0;
  transform: translateY(26px);
  filter: blur(6px);
  transition: opacity 0.7s ease-out, transform 0.7s var(--ease), filter 0.7s ease-out;
  transition-delay: var(--delay, 0ms);
}

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

/* 无 JS 时内容照常可见（不依赖滚动入场） */
.no-js .reveal {
  opacity: 1;
  transform: none;
  filter: none;
}

/* ---------- 响应式 ---------- */

@media (max-width: 1040px) {
  .nav-links {
    gap: 20px;
  }
}

@media (max-width: 900px) {
  .grid-3,
  .grid-2,
  .timeline {
    grid-template-columns: 1fr;
  }

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

  .timeline::before {
    left: 33px;
    right: auto;
    top: 0;
    bottom: 0;
    width: 1px;
    height: auto;
    background: linear-gradient(180deg, transparent, var(--hair-strong), transparent);
  }

  .step {
    padding: 0 0 0 64px;
  }

  .step .num {
    left: 0;
    width: 58px;
    height: 58px;
    font-size: 19px;
  }

  .step p {
    max-width: none;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 34px;
  }

  .contact-card {
    grid-template-columns: 1fr;
    max-width: 560px;
  }

  .contact-item {
    justify-content: center;
  }
}

@media (max-width: 760px) {
  .nav-links {
    display: none;
  }

  .nav-cta {
    display: none;
  }

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

  .mobile-menu {
    position: fixed;
    inset: var(--header-h) 0 auto;
    z-index: 101;
    display: grid;
    gap: 8px;
    padding: 24px 22px;
    background: var(--paper);
    transform: translateX(100%);
    transition: transform 240ms var(--ease);
    height: calc(100dvh - var(--header-h));
    align-content: start;
  }

  .site-header.menu-active .mobile-menu {
    transform: translateX(0);
  }

  .mobile-menu a {
    display: flex;
    align-items: center;
    min-height: 52px;
    border-bottom: 1px solid var(--hair);
    color: var(--ink);
    font-size: 18px;
    font-weight: 600;
  }

  .mobile-menu .nav-cta {
    display: inline-flex;
    justify-content: center;
    margin-top: 14px;
    border: 0;
  }

  .stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .stat:nth-child(odd) {
    border-left: 0;
  }

  .stat:nth-child(n + 3) {
    border-top: 1px solid var(--hair);
  }

  .grid-4 {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 20px;
  }

  .footer-grid .brand {
    justify-content: center;
  }

  .footer-record {
    text-align: center;
  }
}

/* ---------- 学习中心入口（个人站 #learn） ---------- */

.learn-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 44px;
}

.learn-head .section-head {
  margin: 0;
  max-width: 620px;
}

.learn-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  padding-bottom: 6px;
  font-size: 15px;
  font-weight: 600;
  color: var(--accent);
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 45%, transparent);
  transition: gap 220ms var(--ease);
}

.learn-link:hover {
  gap: 14px;
}

.learn-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.learn-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 30px;
  border: 1px solid var(--hair);
  border-radius: 18px;
  background: var(--card);
  box-shadow: 0 12px 32px rgba(23, 19, 13, 0.05);
  transition: transform 280ms var(--ease), box-shadow 280ms var(--ease), border-color 280ms var(--ease);
}

@media (hover: hover) and (pointer: fine) {
  .learn-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 24px 50px rgba(23, 19, 13, 0.1);
    border-color: var(--hair-strong);
  }
}

.learn-card-primary {
  background: var(--accent-tint);
  border-color: color-mix(in srgb, var(--accent) 30%, var(--hair));
  grid-row: span 2;
  justify-content: flex-end;
}

.learn-card-index {
  font-family: var(--serif);
  font-size: 40px;
  font-weight: 600;
  line-height: 1;
  color: var(--accent);
  opacity: 0.5;
  margin-bottom: 18px;
}

.learn-card-type {
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--ink-mute);
  margin-bottom: 10px;
}

.learn-card h3 {
  font-size: 21px;
  line-height: 1.34;
  margin-bottom: 10px;
}

.learn-card p {
  margin: 0 0 18px;
  font-size: 14.5px;
  color: var(--ink-soft);
  line-height: 1.75;
}

.learn-card strong {
  margin-top: auto;
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
}

/* ---------- 分享卡（抖音关注） ---------- */

.share-card {
  display: grid;
  grid-template-columns: 1fr 200px;
  align-items: center;
  gap: 34px;
  max-width: 940px;
  margin: 0 auto;
  padding: clamp(28px, 4vw, 46px);
  border-radius: 24px;
  background: var(--accent-tint);
  border: 1px solid color-mix(in srgb, var(--accent) 24%, var(--hair));
}

.share-card h2 {
  font-size: clamp(26px, 3.2vw, 36px);
  margin-bottom: 14px;
}

.share-card > div > p {
  margin: 0 0 20px;
  max-width: 46ch;
  font-size: 16px;
  color: var(--ink-soft);
  line-height: 1.85;
}

.share-points {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 11px;
}

.share-points li {
  position: relative;
  padding-left: 22px;
  font-size: 14.8px;
  color: var(--ink-soft);
}

.share-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

/* ---------- 跨站横幅（前往企业服务） ---------- */

.cross-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  max-width: 940px;
  margin: 0 auto;
  padding: 28px clamp(24px, 4vw, 40px);
  border-radius: 20px;
  border: 1px solid var(--hair);
  background: var(--card);
}

.cross-banner p {
  margin: 0;
  font-size: 16px;
  color: var(--ink-soft);
}

.cross-banner strong {
  font-family: var(--serif);
  font-size: 20px;
  color: var(--ink);
}

/* ---------- 区块 CTA ---------- */

.section-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 16px 26px;
  margin-top: 46px;
  text-align: center;
}

.section-cta span {
  font-size: 16.5px;
  color: var(--ink-soft);
}

.contact-note {
  margin: 14px 0 22px;
  font-size: 15px;
  color: var(--ink-mute);
}

.contact-note a {
  color: var(--accent);
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 45%, transparent);
}

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

/* ---------- AI 助手浮窗 ---------- */

.ai-assistant {
  position: fixed;
  right: clamp(16px, 3vw, 30px);
  bottom: clamp(16px, 3vw, 30px);
  z-index: 120;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 14px;
}

.ai-chat-toggle {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 10px 20px 10px 12px;
  border: 1px solid color-mix(in srgb, var(--accent) 22%, var(--hair));
  border-radius: 999px;
  background: var(--card);
  color: var(--ink);
  cursor: pointer;
  box-shadow: 0 14px 34px rgba(23, 19, 13, 0.14);
  transition: transform 220ms var(--ease), box-shadow 220ms var(--ease);
}

.ai-chat-toggle:hover {
  transform: translateY(-2px);
  box-shadow: 0 20px 44px rgba(23, 19, 13, 0.18);
}

.ai-chat-toggle-mark {
  display: grid;
  place-items: center;
}

.ai-chat-toggle-mark img {
  width: 40px;
  height: 40px;
  border-radius: 12px;
}

.ai-chat-toggle strong {
  display: block;
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

.ai-chat-toggle small {
  display: block;
  font-size: 12px;
  color: var(--ink-mute);
}

.ai-chat-panel {
  width: min(92vw, 380px);
  max-height: min(74vh, 620px);
  display: flex;
  flex-direction: column;
  border: 1px solid var(--hair);
  border-radius: 22px;
  background: var(--paper);
  box-shadow: 0 30px 70px rgba(23, 19, 13, 0.22);
  overflow: hidden;
}

.ai-chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 22px;
  border-bottom: 1px solid var(--hair);
  background: var(--accent-tint);
}

.ai-chat-header span {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--accent);
}

.ai-chat-header h2 {
  font-size: 20px;
  margin-top: 2px;
}

.ai-chat-close {
  width: 34px;
  height: 34px;
  border: 1px solid var(--hair);
  border-radius: 50%;
  background: var(--card);
  color: var(--ink-soft);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  flex: 0 0 auto;
}

.ai-chat-close:hover {
  color: var(--ink);
}

.ai-chat-messages {
  flex: 1 1 auto;
  overflow-y: auto;
  padding: 20px 22px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.ai-chat-message {
  max-width: 88%;
  padding: 12px 15px;
  border-radius: 16px;
  font-size: 14.5px;
  line-height: 1.7;
}

.ai-chat-message strong {
  display: block;
  margin-bottom: 4px;
  font-size: 12px;
  font-weight: 600;
  opacity: 0.7;
}

.ai-chat-message p {
  margin: 0;
}

.ai-chat-message-bot {
  align-self: flex-start;
  background: var(--card);
  border: 1px solid var(--hair);
  color: var(--ink);
}

.ai-chat-message-user {
  align-self: flex-end;
  background: var(--accent);
  color: #fff;
}

.ai-chat-message-user strong {
  color: rgba(255, 255, 255, 0.85);
}

.ai-chat-prompts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0 22px 4px;
}

.ai-chat-prompts button {
  padding: 7px 13px;
  border: 1px solid var(--hair-strong);
  border-radius: 999px;
  background: var(--card);
  color: var(--ink-soft);
  font-size: 13px;
  cursor: pointer;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.ai-chat-prompts button:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.ai-chat-form {
  display: grid;
  gap: 10px;
  padding: 14px 22px 8px;
}

.ai-chat-form textarea {
  width: 100%;
  resize: none;
  padding: 12px 14px;
  border: 1px solid var(--hair-strong);
  border-radius: 14px;
  background: var(--card);
  color: var(--ink);
  font-size: 14.5px;
  line-height: 1.6;
}

.ai-chat-form textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.ai-chat-consent {
  display: flex;
  gap: 8px;
  font-size: 12px;
  color: var(--ink-mute);
  line-height: 1.5;
}

.ai-chat-consent a {
  color: var(--accent);
}

.ai-chat-form button[type="submit"] {
  justify-self: stretch;
  padding: 12px;
  border: 0;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 10px 24px var(--accent-shadow);
}

.ai-chat-privacy,
.ai-chat-status {
  margin: 0;
  padding: 0 22px;
  font-size: 11.5px;
  color: var(--ink-mute);
  line-height: 1.5;
}

.ai-chat-status {
  padding: 6px 22px 16px;
  min-height: 1em;
  color: var(--accent);
}

@media (max-width: 900px) {
  .learn-grid {
    grid-template-columns: 1fr;
  }

  .learn-card-primary {
    grid-row: auto;
  }

  .learn-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .share-card {
    grid-template-columns: 1fr;
    gap: 24px;
    max-width: 540px;
  }

  .share-card .qr {
    margin: 0 auto;
  }

  .cross-banner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 760px) {
  .ai-chat-toggle small {
    display: none;
  }

  .ai-chat-toggle strong {
    font-size: 15px;
  }
}

/* ---------- 内容页（关于 / 服务 / 常见问题 / 隐私） ---------- */

.content-header {
  position: static;
  height: auto;
  border-bottom: 1px solid var(--hair);
  background: var(--paper);
}

.content-header .nav-shell {
  height: auto;
  min-height: var(--header-h);
  flex-wrap: wrap;
  padding: 12px 0;
}

.content-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  font-size: 14.5px;
  color: var(--ink-soft);
}

.content-nav a {
  padding: 4px 0;
  transition: color 200ms var(--ease);
}

.content-nav a:hover {
  color: var(--ink);
}

.content-nav a[aria-current="page"] {
  color: var(--accent);
  font-weight: 600;
}

.page {
  position: relative;
  z-index: 1;
  padding: clamp(48px, 7vw, 88px) 0 clamp(64px, 9vw, 120px);
}

.page-hero {
  max-width: 760px;
  margin-bottom: clamp(40px, 5vw, 60px);
  padding-bottom: clamp(28px, 4vw, 40px);
  border-bottom: 1px solid var(--hair);
}

.page-hero h1 {
  margin: 6px 0 18px;
  font-size: clamp(32px, 5vw, 56px);
  line-height: 1.1;
  letter-spacing: -0.015em;
}

.page-hero h1 em {
  font-style: italic;
  color: var(--accent);
}

.page-lead {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.9;
  color: var(--ink-soft);
}

.page-updated {
  margin: 18px 0 0;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink-mute);
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.info-grid.one {
  grid-template-columns: 1fr;
}

.info-card {
  padding: clamp(24px, 3vw, 32px);
  border: 1px solid var(--hair);
  border-radius: 18px;
  background: var(--card);
  box-shadow: 0 12px 30px rgba(23, 19, 13, 0.04);
}

.info-card h2,
.faq-item h2 {
  margin: 0 0 12px;
  font-size: 21px;
  line-height: 1.35;
  color: var(--ink);
}

.info-card p,
.faq-answer p {
  margin: 0;
  color: var(--ink-soft);
  line-height: 1.85;
}

.info-list {
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.info-list li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  color: var(--ink-soft);
  line-height: 1.7;
}

.info-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.callout {
  margin-top: 22px;
  padding: clamp(26px, 3.5vw, 38px);
  border-radius: 20px;
  background: var(--accent-tint);
  border: 1px solid color-mix(in srgb, var(--accent) 22%, var(--hair));
}

.callout h2 {
  margin: 0 0 12px;
  font-size: 23px;
  color: var(--ink);
}

.callout p {
  margin: 0;
  color: var(--ink-soft);
  line-height: 1.85;
}

.faq {
  display: grid;
  gap: 14px;
}

.faq-item {
  padding: clamp(22px, 3vw, 30px) clamp(24px, 3vw, 32px);
  border: 1px solid var(--hair);
  border-radius: 18px;
  background: var(--card);
}

.faq-item h2 {
  margin-bottom: 10px;
}

.info-card a,
.faq-answer a,
.callout a,
.page-lead a {
  color: var(--accent);
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 40%, transparent);
}

@media (max-width: 760px) {
  .info-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- 学习中心（learn.html + 七节课程页，scope: .learning-page） ---------- */

.learning-page .content-main {
  position: relative;
  z-index: 1;
  padding: clamp(32px, 5vw, 64px) 0 clamp(64px, 9vw, 110px);
}

.learning-page .content-shell {
  width: min(100% - 44px, 960px);
  margin: 0 auto;
}

.learning-page .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 28px;
  font-size: 13px;
  color: var(--ink-mute);
}

.learning-page .breadcrumbs a:hover {
  color: var(--accent);
}

.learning-page .content-hero {
  margin-bottom: clamp(32px, 4vw, 48px);
}

.learning-page .content-kicker {
  display: inline-block;
  margin-bottom: 14px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--accent);
}

.learning-page .course-hero h1,
.learning-page .content-hero h1,
.learning-page .content-hero h2 {
  font-size: clamp(28px, 4.4vw, 50px);
  line-height: 1.12;
  letter-spacing: -0.015em;
  color: var(--ink);
}

.learning-page .content-hero h2 {
  font-size: clamp(24px, 3.4vw, 38px);
}

.learning-page .course-summary {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.9;
  color: var(--ink-soft);
}

.learning-page .content-lead {
  margin: 12px 0 0;
  max-width: 60ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.learning-page .course-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-top: 22px;
  font-size: 13px;
  color: var(--ink-mute);
}

.learning-page .course-meta span {
  position: relative;
  padding-left: 16px;
}

.learning-page .course-meta span::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.6;
}

/* 课程进度条 */
.learning-page .course-path {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 40px;
  padding: 0;
  list-style: none;
}

.learning-page .course-path li {
  display: flex;
}

.learning-page .course-path a,
.learning-page .course-path span {
  display: inline-flex;
  align-items: center;
  padding: 7px 13px;
  border: 1px solid var(--hair);
  border-radius: 999px;
  background: var(--card);
  font-size: 13px;
  color: var(--ink-soft);
}

.learning-page .course-path a:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.learning-page .course-path [aria-current="step"] {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* 概览网格 */
.learning-page .course-intro-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 18px;
  margin-bottom: clamp(40px, 5vw, 60px);
}

.learning-page .answer-card {
  padding: clamp(24px, 3vw, 32px);
  border-radius: 18px;
  background: var(--accent-tint);
  border: 1px solid color-mix(in srgb, var(--accent) 24%, var(--hair));
}

.learning-page .lesson-outcomes {
  padding: clamp(24px, 3vw, 32px);
  border-radius: 18px;
  background: var(--card);
  border: 1px solid var(--hair);
}

.learning-page .answer-card h2,
.learning-page .lesson-outcomes h2 {
  margin: 0 0 12px;
  font-size: 19px;
  color: var(--ink);
}

.learning-page .answer-card p {
  margin: 0;
  color: var(--ink-soft);
  line-height: 1.85;
}

.learning-page .lesson-outcomes ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 9px;
}

.learning-page .lesson-outcomes li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  color: var(--ink-soft);
}

.learning-page .lesson-outcomes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

/* 正文 + 目录布局 */
.learning-page .lesson-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 44px;
  align-items: start;
}

.learning-page .lesson-toc {
  position: sticky;
  top: 90px;
  display: grid;
  gap: 8px;
  padding: 20px;
  border: 1px solid var(--hair);
  border-radius: 16px;
  background: var(--card);
  font-size: 14px;
}

.learning-page .lesson-toc strong {
  font-family: var(--serif);
  font-size: 15px;
  color: var(--ink);
  margin-bottom: 4px;
}

.learning-page .lesson-toc a {
  color: var(--ink-soft);
}

.learning-page .lesson-toc a:hover {
  color: var(--accent);
}

.learning-page .lesson-section {
  margin-bottom: clamp(40px, 5vw, 58px);
}

.learning-page .lesson-article h2 {
  margin: 0 0 16px;
  font-size: clamp(22px, 2.8vw, 30px);
  line-height: 1.3;
  color: var(--ink);
}

.learning-page .lesson-article h3 {
  margin: 0 0 8px;
  font-size: 18px;
  color: var(--ink);
}

.learning-page .lesson-article p {
  margin: 0 0 16px;
  font-size: 16.5px;
  line-height: 1.95;
  color: var(--ink-soft);
}

.learning-page .lesson-article a {
  color: var(--accent);
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 40%, transparent);
}

/* 概念/要点卡片 */
.learning-page .term-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 20px;
}

.learning-page .term-card {
  padding: 24px;
  border: 1px solid var(--hair);
  border-radius: 16px;
  background: var(--card);
}

.learning-page .term-card h3 {
  margin: 0 0 8px;
}

.learning-page .term-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
}

/* 自测 */
.learning-page .knowledge-check details {
  margin-top: 12px;
  padding: 16px 20px;
  border: 1px solid var(--hair);
  border-radius: 14px;
  background: var(--card);
}

.learning-page .knowledge-check summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--ink);
  font-size: 15.5px;
}

.learning-page .knowledge-check details[open] summary {
  margin-bottom: 10px;
  color: var(--accent);
}

.learning-page .knowledge-check p {
  margin: 0;
  font-size: 15px;
}

/* 来源 */
.learning-page .source-list ul {
  margin: 0 0 14px;
  padding-left: 20px;
  display: grid;
  gap: 8px;
}

.learning-page .source-list li {
  font-size: 15px;
  color: var(--ink-soft);
}

/* 上/下一课 */
.learning-page .lesson-navigation {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 40px;
  padding-top: 32px;
  border-top: 1px solid var(--hair);
}

.learning-page .lesson-navigation a {
  display: grid;
  gap: 4px;
  padding: 20px 24px;
  border: 1px solid var(--hair);
  border-radius: 16px;
  background: var(--card);
  transition: border-color 220ms var(--ease), transform 220ms var(--ease);
}

.learning-page .lesson-navigation a:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}

.learning-page .lesson-navigation small {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-mute);
}

.learning-page .lesson-navigation strong {
  font-family: var(--serif);
  font-size: 17px;
  color: var(--ink);
  line-height: 1.35;
}

.learning-page .next-lesson {
  text-align: right;
}

.learning-page .next-lesson small {
  color: var(--accent);
}

/* learn.html 课程地图 */
.learning-page .course-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.learning-page .course-card {
  display: flex;
  flex-direction: column;
  padding: 28px;
  border: 1px solid var(--hair);
  border-radius: 18px;
  background: var(--card);
  box-shadow: 0 12px 30px rgba(23, 19, 13, 0.04);
  transition: transform 260ms var(--ease), box-shadow 260ms var(--ease), border-color 260ms var(--ease);
}

.learning-page .course-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 24px 50px rgba(23, 19, 13, 0.1);
  border-color: var(--hair-strong);
}

.learning-page .course-card-label {
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--ink-mute);
  margin-bottom: 10px;
}

.learning-page .course-card h2 {
  font-size: 20px;
  line-height: 1.34;
  color: var(--ink);
  margin: 0 0 10px;
}

.learning-page .course-card p {
  margin: 0 0 18px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.learning-page .course-card-action {
  margin-top: auto;
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
}

/* 边界提示块 */
.learning-page .content-callout {
  margin-top: clamp(40px, 5vw, 56px);
  padding: clamp(24px, 3vw, 32px);
  border-radius: 18px;
  border: 1px solid var(--hair);
  border-left: 3px solid var(--accent);
  background: var(--card);
}

.learning-page .content-callout h2 {
  margin: 0 0 10px;
  font-size: 20px;
  color: var(--ink);
}

.learning-page .content-callout p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* 历史课时间线 */
.learning-page .history-section-heading {
  margin-bottom: 24px;
}

.learning-page .history-section-index {
  font-family: var(--serif);
  font-size: 30px;
  color: var(--accent);
  opacity: 0.5;
  margin-right: 12px;
}

.learning-page .history-era-map {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 32px;
}

.learning-page .history-era-map a {
  display: grid;
  gap: 3px;
  padding: 16px;
  border: 1px solid var(--hair);
  border-radius: 14px;
  background: var(--card);
}

.learning-page .history-era-map a:hover {
  border-color: var(--accent);
}

.learning-page .history-era-map span {
  font-family: var(--serif);
  font-size: 18px;
  color: var(--accent);
}

.learning-page .history-era-map small {
  font-size: 12px;
  color: var(--ink-mute);
}

.learning-page .history-era-map strong {
  font-size: 14px;
  color: var(--ink);
}

.learning-page .history-timeline {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 4px;
}

.learning-page .history-event {
  display: grid;
  grid-template-columns: 130px minmax(0, 1fr);
  gap: 20px;
  padding: 20px 0;
  border-top: 1px solid var(--hair);
}

.learning-page .history-year {
  font-family: var(--serif);
  font-size: 18px;
  color: var(--ink);
}

.learning-page .history-date small {
  display: block;
  font-size: 12px;
  color: var(--ink-mute);
  margin-top: 2px;
}

.learning-page .history-event[data-milestone="true"] .history-year,
.learning-page .history-event[data-current="true"] .history-year {
  color: var(--accent);
}

.learning-page .history-copy h3 {
  margin: 0 0 6px;
}

.learning-page .history-copy p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-soft);
}

@media (max-width: 900px) {
  .learning-page .course-intro-grid,
  .learning-page .term-grid,
  .learning-page .course-grid,
  .learning-page .lesson-navigation {
    grid-template-columns: 1fr;
  }

  .learning-page .lesson-layout {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .learning-page .lesson-toc {
    position: static;
  }

  .learning-page .history-era-map {
    grid-template-columns: repeat(2, 1fr);
  }

  .learning-page .next-lesson {
    text-align: left;
  }
}

@media (max-width: 560px) {
  .learning-page .history-event {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  * {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
    filter: none;
  }
}