/* =====================================================
   精东App下载导航 — Swiss Modernism 2.0 主样式
   字体：Outfit / Work Sans
   基准单位：8px grid
   ===================================================== */

/* === 导入字体 === */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&family=Work+Sans:wght@300;400;500;600;700&display=swap');

/* === CSS 变量 === */
:root {
  --c-black: #000000;
  --c-white: #ffffff;
  --c-accent: #000000;
  --c-gray-100: #f4f4f4;
  --c-gray-200: #e8e8e8;
  --c-gray-300: #cccccc;
  --c-gray-500: #888888;
  --c-gray-700: #333333;
  --c-gray-900: #111111;

  --font-main: 'Outfit', 'Work Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-mono: 'Courier New', Courier, monospace;

  --unit: 8px;
  --u1: 8px;
  --u2: 16px;
  --u3: 24px;
  --u4: 32px;
  --u5: 40px;
  --u6: 48px;
  --u8: 64px;
  --u10: 80px;
  --u12: 96px;
  --u16: 128px;

  --nav-h: 64px;
  --max-w: 1280px;
  --col-gap: 1rem;

  --shadow-card: 0 2px 16px 0 rgba(0,0,0,0.10), 0 1px 4px 0 rgba(0,0,0,0.06);
  --shadow-card-hover: 0 8px 32px 0 rgba(0,0,0,0.18), 0 2px 8px 0 rgba(0,0,0,0.10);

  --trans: 0.22s cubic-bezier(0.4,0,0.2,1);
}

/* === 重置与基础 === */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-main);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--c-black);
  background: var(--c-white);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a {
  color: var(--c-black);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul, ol {
  list-style: none;
}

/* === 12列网格辅助 === */
.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--col-gap);
  width: 100%;
  max-width: var(--max-w);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--u3);
  padding-right: var(--u3);
}

/* === 网站导航 === */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--c-black);
  color: var(--c-white);
  height: var(--nav-h);
  border-bottom: 2px solid var(--c-white);
}

.site-header .header-inner {
  height: var(--nav-h);
  align-items: center;
  max-width: var(--max-w);
  margin: 0 auto;
  padding-left: var(--u3);
  padding-right: var(--u3);
}

.brand-col {
  grid-column: 1 / 4;
  display: flex;
  align-items: center;
}

.brand-link {
  color: var(--c-white);
  font-family: var(--font-main);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  text-decoration: none;
  white-space: nowrap;
}

.brand-link:hover {
  text-decoration: underline;
}

.main-nav {
  grid-column: 4 / 13;
  display: flex;
  align-items: center;
  justify-content: flex-end;
}

.main-nav p {
  display: flex;
  flex-wrap: wrap;
  gap: 0 var(--u1);
  align-items: center;
  justify-content: flex-end;
  margin: 0;
}

.main-nav p a {
  color: var(--c-white);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  padding: var(--u1) var(--u1);
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: border-color var(--trans);
  white-space: nowrap;
}

.main-nav p a:hover,
.main-nav p a[aria-current="page"] {
  border-bottom-color: var(--c-white);
  text-decoration: none;
}

/* === 主内容区 === */
.page-main {
  min-height: calc(100vh - var(--nav-h));
}

/* === HERO 区（首页） === */
.hero-section {
  min-height: 100vh;
  background: var(--c-black);
  color: var(--c-white);
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 0;
  position: relative;
  overflow: hidden;
}

.hero-aside {
  background: var(--c-gray-900);
  padding: calc(var(--nav-h) + var(--u8)) var(--u3) var(--u8);
  border-right: 1px solid #222;
  display: flex;
  flex-direction: column;
  gap: var(--u4);
}

.hero-figure {
  padding: calc(var(--nav-h) + var(--u10)) var(--u8) var(--u8) var(--u8);
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  text-align: right;
  position: relative;
  z-index: 1;
}

.hero-dot-grid {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(255,255,255,0.08) 1px, transparent 1px);
  background-size: 32px 32px;
  z-index: 0;
  pointer-events: none;
}

.hero-text {
  position: relative;
  z-index: 1;
  max-width: 780px;
}

.hero-title {
  font-size: clamp(2.4rem, 6vw, 5.5rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--c-white);
  margin-bottom: var(--u3);
  text-align: right;
}

.hero-sub {
  font-size: 1.15rem;
  font-weight: 300;
  color: var(--c-gray-300);
  margin-bottom: var(--u5);
  text-align: right;
  max-width: 560px;
  margin-left: auto;
}

.hero-actions {
  display: flex;
  gap: var(--u2);
  justify-content: flex-end;
  flex-wrap: wrap;
}

/* === 侧边元信息 === */
.aside-meta, .page-meta {
  display: flex;
  flex-direction: column;
  gap: var(--u1);
}

.aside-meta dt, .page-meta dt {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--c-gray-500);
  text-transform: uppercase;
  margin-top: var(--u2);
}

.aside-meta dt:first-child, .page-meta dt:first-child {
  margin-top: 0;
}

.aside-meta dd, .page-meta dd {
  font-size: 0.85rem;
  color: var(--c-gray-300);
}

.page-home .aside-meta dd,
.page-home .page-meta dd {
  color: var(--c-gray-300);
}

/* === 内容区通用布局 === */
.content-section,
.article-section,
.pricing-content-section,
.faq-content-section,
.about-content-section,
.contact-content-section,
.privacy-content-section {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 0;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: var(--u8) var(--u3);
  min-height: 60vh;
}

.content-aside,
.article-aside {
  padding-right: var(--u5);
  padding-top: var(--u2);
  position: sticky;
  top: calc(var(--nav-h) + var(--u4));
  align-self: start;
}

.content-body,
.article-body {
  min-width: 0;
}

/* === 快捷导航 aside === */
.quick-nav, .aside-nav, .aside-links, .aside-highlight {
  margin-bottom: var(--u4);
}

.quick-nav dt, .aside-nav dt {
  margin-bottom: var(--u2);
}

.quick-nav dt h3,
.aside-nav dt h3 {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-gray-500);
  margin: 0;
}

.quick-nav dd, .aside-nav dd {
  margin: 0;
  padding: 0;
}

.quick-nav dd a, .aside-nav dd a {
  display: block;
  font-size: 0.85rem;
  color: var(--c-gray-700);
  padding: 5px 0;
  border-left: 2px solid transparent;
  padding-left: var(--u2);
  transition: all var(--trans);
  text-decoration: none;
  min-height: 32px;
  line-height: 1.4;
}

.quick-nav dd a:hover, .aside-nav dd a:hover {
  border-left-color: var(--c-black);
  color: var(--c-black);
  text-decoration: none;
}

.aside-highlight dt {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-gray-500);
  margin-bottom: var(--u1);
}

.aside-highlight dd {
  font-size: 0.82rem;
  color: var(--c-gray-700);
  padding: 3px 0 3px var(--u2);
  border-left: 2px solid var(--c-gray-200);
}

.aside-links dt {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-gray-500);
  margin-bottom: var(--u1);
  margin-top: var(--u3);
}

.aside-links dd a {
  display: block;
  font-size: 0.85rem;
  color: var(--c-gray-700);
  padding: 5px 0 5px var(--u2);
  border-left: 2px solid transparent;
  transition: all var(--trans);
  text-decoration: none;
  min-height: 32px;
}

.aside-links dd a:hover {
  border-left-color: var(--c-black);
  color: var(--c-black);
}

/* === 节标题 === */
.section-heading {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: var(--u4);
  padding-bottom: var(--u2);
  border-bottom: 3px solid var(--c-black);
  display: flex;
  align-items: center;
  gap: var(--u2);
}

.section-heading span {
  display: inline;
}

.section-heading-sm {
  font-size: 1.1rem;
  font-weight: 700;
  margin-top: var(--u6);
  margin-bottom: var(--u3);
  padding-bottom: var(--u1);
  border-bottom: 2px solid var(--c-gray-200);
}

.section-heading-sm span {
  display: inline;
}

/* === 散文正文 === */
.prose {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--c-gray-900);
  max-width: 720px;
}

.prose h2 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-top: var(--u6);
  margin-bottom: var(--u3);
  padding-bottom: var(--u1);
  border-bottom: 2px solid var(--c-gray-200);
}

.prose h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-top: var(--u4);
  margin-bottom: var(--u2);
}

.prose p {
  margin-bottom: var(--u3);
}

.prose ul, .prose ol {
  margin-bottom: var(--u3);
  padding-left: var(--u4);
}

.prose ul li {
  list-style: disc;
  margin-bottom: var(--u1);
}

.prose ol li {
  list-style: decimal;
  margin-bottom: var(--u1);
}

.prose a {
  color: var(--c-black);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.prose a:hover {
  background: var(--c-black);
  color: var(--c-white);
  text-decoration: none;
}

.prose--legal {
  font-size: 0.95rem;
}

.prose--legal h2 {
  font-size: 1.15rem;
}

.faq-prose h2, .faq-prose h3 {
  color: var(--c-black);
}

/* === 页面内 Hero（非首页）=== */
.page-hero-section {
  background: var(--c-black);
  color: var(--c-white);
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 0;
  min-height: 40vh;
}

.page-hero-aside {
  background: var(--c-gray-900);
  padding: var(--u8) var(--u3) var(--u6);
  border-right: 1px solid #222;
}

.page-hero-aside .page-meta dt {
  color: #666;
}

.page-hero-aside .page-meta dd {
  color: #bbb;
}

.page-hero-figure {
  padding: var(--u8) var(--u8) var(--u6);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  text-align: right;
  align-items: flex-end;
}

.page-eyebrow {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-gray-500);
  margin-bottom: var(--u2);
}

.page-title {
  font-size: clamp(1.8rem, 4vw, 3.5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--c-white);
  margin-bottom: var(--u3);
  text-align: right;
  max-width: 700px;
}

.page-lead {
  font-size: 1.05rem;
  font-weight: 300;
  color: var(--c-gray-300);
  text-align: right;
  max-width: 520px;
  margin-left: auto;
  line-height: 1.6;
}

/* === 首页 索引表格 === */
.index-section {
  background: var(--c-gray-100);
  padding: var(--u8) var(--u3);
}

.index-section .section-header {
  max-width: var(--max-w);
  margin: 0 auto var(--u4);
}

.index-table {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  border-collapse: collapse;
  background: var(--c-white);
  box-shadow: var(--shadow-card);
}

.index-table thead {
  background: var(--c-black);
  color: var(--c-white);
}

.index-table th {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: var(--u2) var(--u3);
  text-align: left;
  border: none;
}

.index-table tbody tr {
  border-bottom: 1px solid var(--c-gray-200);
  transition: background var(--trans);
}

.index-table tbody tr:last-child {
  border-bottom: none;
}

.index-table tbody tr:hover {
  background: var(--c-gray-100);
}

.index-table td {
  padding: var(--u2) var(--u3);
  font-size: 0.95rem;
  vertical-align: middle;
}

.tbl-num {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--c-gray-500);
  letter-spacing: 0.08em;
  width: 60px;
}

.tbl-title {
  font-weight: 600;
}

.tbl-title a {
  color: var(--c-black);
  text-decoration: none;
}

.tbl-title a:hover {
  text-decoration: underline;
}

.tbl-desc {
  color: var(--c-gray-700);
  font-size: 0.88rem;
}

.tbl-action a {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  border: 1px solid var(--c-black);
  padding: 4px 12px;
  text-decoration: none;
  transition: all var(--trans);
  min-height: 32px;
  display: inline-flex;
  align-items: center;
}

.tbl-action a:hover {
  background: var(--c-black);
  color: var(--c-white);
}

/* === 首页 导航卡片 === */
.cards-section {
  padding: var(--u8) var(--u3);
  max-width: var(--max-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 0;
}

.cards-section .section-header {
  grid-column: 1 / -1;
  margin-bottom: var(--u5);
}

.cards-aside {
  padding-right: var(--u5);
  padding-top: var(--u2);
}

.cards-aside dl {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.cards-aside dt {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-gray-500);
  margin-top: var(--u3);
  margin-bottom: var(--u1);
}

.cards-aside dt:first-child {
  margin-top: 0;
}

.cards-aside dt span {
  display: inline;
}

.cards-aside dd a {
  font-size: 0.88rem;
  color: var(--c-gray-700);
  text-decoration: none;
  display: block;
  padding: 4px 0 4px var(--u2);
  border-left: 2px solid var(--c-gray-200);
  transition: all var(--trans);
}

.cards-aside dd a:hover {
  border-left-color: var(--c-black);
  color: var(--c-black);
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--u3);
}

/* === 카드 === */
.card {
  background: var(--c-white);
  border: 1px solid var(--c-gray-200);
  padding: var(--u4);
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--trans), transform var(--trans);
  border-radius: 0;
  display: flex;
  flex-direction: column;
  gap: var(--u2);
}

.card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.card-index {
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--c-black);
  border-bottom: 2px solid var(--c-black);
  padding-bottom: var(--u1);
}

.card-desc {
  font-size: 0.88rem;
  color: var(--c-gray-700);
  line-height: 1.5;
  flex: 1;
}

.card-cta {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--c-black);
  text-decoration: none;
  border: 1px solid var(--c-black);
  padding: 6px 14px;
  align-self: flex-start;
  transition: all var(--trans);
  min-height: 36px;
  display: inline-flex;
  align-items: center;
}

.card-cta:hover {
  background: var(--c-black);
  color: var(--c-white);
  text-decoration: none;
}

/* === 联系页 渠道卡片 === */
.channel-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--u3);
  margin-top: var(--u3);
}

.channel-card {
  border: 1px solid var(--c-gray-200);
  padding: var(--u4);
  box-shadow: var(--shadow-card);
  margin: 0;
  transition: box-shadow var(--trans);
}

.channel-card:hover {
  box-shadow: var(--shadow-card-hover);
}

.channel-card figcaption strong {
  display: block;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: var(--u1);
  border-bottom: 2px solid var(--c-black);
  padding-bottom: var(--u1);
}

.channel-card figcaption p {
  font-size: 0.88rem;
  color: var(--c-gray-700);
  margin: 0;
  margin-top: var(--u1);
}

/* === 文章底部导航 === */
.article-footer-nav {
  display: flex;
  gap: var(--u2);
  margin-top: var(--u6);
  padding-top: var(--u4);
  border-top: 1px solid var(--c-gray-200);
  flex-wrap: wrap;
}

/* === 按钮 === */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--c-white);
  color: var(--c-black);
  font-family: var(--font-main);
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  padding: 12px 24px;
  border: 2px solid var(--c-white);
  text-decoration: none;
  transition: all var(--trans);
  min-height: 44px;
  cursor: pointer;
  border-radius: 0;
}

.btn-primary:hover {
  background: transparent;
  color: var(--c-white);
  text-decoration: none;
}

.page-feature .btn-primary,
.page-pricing .btn-primary,
.page-faq .btn-primary,
.page-about .btn-primary,
.page-contact .btn-primary,
.page-privacy .btn-primary,
.page-default .btn-primary,
.article-footer-nav .btn-primary,
.index-section .btn-primary {
  background: var(--c-black);
  color: var(--c-white);
  border-color: var(--c-black);
}

.page-feature .btn-primary:hover,
.page-pricing .btn-primary:hover,
.page-faq .btn-primary:hover,
.page-about .btn-primary:hover,
.page-contact .btn-primary:hover,
.page-privacy .btn-primary:hover,
.page-default .btn-primary:hover,
.article-footer-nav .btn-primary:hover,
.index-section .btn-primary:hover {
  background: transparent;
  color: var(--c-black);
  text-decoration: none;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--c-white);
  font-family: var(--font-main);
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  padding: 12px 24px;
  border: 2px solid rgba(255,255,255,0.4);
  text-decoration: none;
  transition: all var(--trans);
  min-height: 44px;
  cursor: pointer;
  border-radius: 0;
}

.btn-secondary:hover {
  border-color: var(--c-white);
  background: rgba(255,255,255,0.1);
  text-decoration: none;
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--c-black);
  font-family: var(--font-main);
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  padding: 12px 24px;
  border: 2px solid var(--c-black);
  text-decoration: none;
  transition: all var(--trans);
  min-height: 44px;
  cursor: pointer;
  border-radius: 0;
}

.btn-outline:hover {
  background: var(--c-black);
  color: var(--c-white);
  text-decoration: none;
}

.btn-lg {
  font-size: 1rem;
  padding: 16px 36px;
  min-height: 52px;
}

/* === 节区段头 === */
.section-header {
  margin-bottom: var(--u5);
}

.section-sub {
  font-size: 0.95rem;
  color: var(--c-gray-500);
  margin-top: var(--u2);
}

/* === 页脚 === */
.site-footer {
  background: var(--c-black);
  color: var(--c-white);
  margin-top: var(--u10);
}

.footer-cta {
  background: var(--c-white);
  color: var(--c-black);
  padding: var(--u10) var(--u3);
  border-top: 4px solid var(--c-black);
  border-bottom: 4px solid var(--c-black);
}

.footer-cta-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  text-align: center;
}

.footer-cta-title {
  font-size: clamp(1.6rem, 3.5vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--u2);
  color: var(--c-black);
}

.footer-cta-title span {
  display: inline;
}

.footer-cta-sub {
  font-size: 1rem;
  color: var(--c-gray-700);
  margin-bottom: var(--u5);
}

.footer-main {
  padding: var(--u8) var(--u3);
  display: grid !important;
  grid-template-columns: repeat(3, 1fr) !important;
  gap: var(--u6) !important;
  max-width: var(--max-w);
  margin: 0 auto;
}

.footer-dl {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.footer-dl dt {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-gray-500);
  margin-bottom: var(--u2);
  padding-bottom: var(--u1);
  border-bottom: 1px solid #222;
}

.footer-dl dd {
  margin: 0;
  padding: 4px 0;
}

.footer-dl dd a {
  color: var(--c-gray-300);
  font-size: 0.88rem;
  text-decoration: none;
  transition: color var(--trans);
  display: inline-block;
  min-height: 28px;
  line-height: 28px;
}

.footer-dl dd a:hover {
  color: var(--c-white);
  text-decoration: underline;
}

.footer-dl dd:not(:has(a)) {
  color: var(--c-gray-500);
  font-size: 0.88rem;
  line-height: 1.5;
}

.footer-bottom {
  border-top: 1px solid #222;
  padding: var(--u3) var(--u3);
  text-align: center;
}

.footer-bottom p {
  font-size: 0.8rem;
  color: var(--c-gray-500);
}

/* === 滚动显现动效 === */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

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

.stagger-item {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.stagger-item.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .reveal, .stagger-item {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .card {
    transition: none;
  }
  html {
    scroll-behavior: auto;
  }
}

/* === 响应式：平板 768px === */
@media (max-width: 1024px) {
  .cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-title {
    font-size: 3rem;
  }

  .content-section,
  .article-section,
  .pricing-content-section,
  .faq-content-section,
  .about-content-section,
  .contact-content-section,
  .privacy-content-section {
    grid-template-columns: 180px 1fr;
    padding: var(--u6) var(--u3);
  }

  .cards-section {
    grid-template-columns: 1fr;
  }

  .cards-aside {
    padding-right: 0;
    padding-bottom: var(--u3);
  }

  .cards-aside dl {
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--u2);
    align-items: center;
  }

  .cards-aside dt {
    margin-top: 0;
  }

  .footer-main {
    grid-template-columns: 1fr 1fr !important;
    gap: var(--u4) !important;
  }

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

/* === 响应式：手机 375px === */
@media (max-width: 768px) {
  :root {
    --nav-h: 56px;
  }

  .site-header .header-inner {
    grid-template-columns: 1fr auto;
    padding-left: var(--u2);
    padding-right: var(--u2);
  }

  .brand-col {
    grid-column: 1 / 2;
  }

  .main-nav {
    grid-column: 2 / 3;
  }

  .main-nav p {
    gap: 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    flex-wrap: nowrap;
    max-width: 60vw;
    padding-bottom: 2px;
  }

  .main-nav p a {
    font-size: 0.75rem;
    padding: var(--u1) 8px;
    white-space: nowrap;
    min-height: 40px;
  }

  .hero-section {
    grid-template-columns: 1fr;
    min-height: 100vh;
  }

  .hero-aside {
    display: none;
  }

  .hero-figure {
    padding: calc(var(--nav-h) + var(--u6)) var(--u3) var(--u8);
    align-items: flex-start;
    text-align: left;
  }

  .hero-title {
    font-size: clamp(2rem, 10vw, 3rem);
    text-align: left;
  }

  .hero-sub {
    text-align: left;
    margin-left: 0;
    font-size: 1rem;
  }

  .hero-actions {
    justify-content: flex-start;
  }

  .page-hero-section {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .page-hero-aside {
    display: none;
  }

  .page-hero-figure {
    padding: var(--u6) var(--u3) var(--u5);
    text-align: left;
    align-items: flex-start;
  }

  .page-title {
    text-align: left;
  }

  .page-lead {
    text-align: left;
    margin-left: 0;
  }

  .content-section,
  .article-section,
  .pricing-content-section,
  .faq-content-section,
  .about-content-section,
  .contact-content-section,
  .privacy-content-section {
    grid-template-columns: 1fr;
    padding: var(--u5) var(--u2);
    gap: var(--u4);
  }

  .content-aside,
  .article-aside {
    position: static;
    padding-right: 0;
    border-bottom: 1px solid var(--c-gray-200);
    padding-bottom: var(--u3);
  }

  .quick-nav dd a,
  .aside-nav dd a {
    padding-left: var(--u1);
  }

  .cards-section {
    grid-template-columns: 1fr;
    padding: var(--u5) var(--u2);
  }

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

  .index-section {
    padding: var(--u5) var(--u2);
    overflow-x: auto;
  }

  .index-table {
    min-width: 560px;
  }

  .section-heading {
    font-size: 1.2rem;
  }

  .footer-main {
    grid-template-columns: 1fr !important;
    padding: var(--u5) var(--u2) !important;
    gap: var(--u4) !important;
  }

  .footer-cta {
    padding: var(--u6) var(--u2);
  }

  .footer-cta-title {
    font-size: 1.6rem;
  }

  .footer-bottom {
    padding: var(--u3) var(--u2);
  }

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

  .article-footer-nav {
    flex-direction: column;
  }

  .article-footer-nav .btn-primary,
  .article-footer-nav .btn-outline {
    width: 100%;
    justify-content: center;
  }

  .btn-lg {
    padding: 14px 24px;
    font-size: 0.95rem;
  }

  .prose {
    font-size: 1rem;
  }
}

/* === 移动横向溢出防护 === */
@media (max-width: 480px) {
  body {
    overflow-x: hidden;
  }

  .grid-12 {
    padding-left: var(--u2);
    padding-right: var(--u2);
  }

  .cards-section .section-header {
    grid-column: 1 / -1;
  }

  .tbl-desc {
    display: none;
  }
}