@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:wght@300;400;500;600;700&family=Noto+Sans:wght@300;400;500;600;700&display=swap');

/* ===========================
   CSS 变量 & 重置
   =========================== */
:root {
  --c-primary: #2D6BE4;
  --c-accent: #F5A623;
  --c-dark: #1A1A2E;
  --c-primary-dark: #1a4fb8;
  --c-primary-light: #5a8feb;
  --c-accent-dark: #d4891a;
  --c-bg: #ffffff;
  --c-bg-alt: #f4f6fb;
  --c-bg-dark: #0e0e1f;
  --c-text: #1A1A2E;
  --c-text-muted: #5a5a7a;
  --c-border: #dde1ef;
  --c-white: #ffffff;

  --font-main: 'Be Vietnam Pro', 'Noto Sans', system-ui, sans-serif;
  --font-size-base: 16px;
  --line-height-base: 1.7;
  --radius: 0;

  --header-height-brand: 64px;
  --header-height-nav: 48px;
  --header-total: 112px;
  --max-w: 1200px;
  --content-max: 780px;
  --sidebar-w: 220px;
  --aside-w: 240px;
  --gap: 24px;
  --section-gap: 64px;

  --transition: 160ms ease;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-main);
  font-size: 1rem;
  line-height: var(--line-height-base);
  color: var(--c-text);
  background: var(--c-bg);
  min-height: 100vh;
  overflow-x: hidden;
}

ul, ol { list-style: none; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* ===========================
   隐藏辅助用 aside（结构抽签）
   =========================== */
.site-aside {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
}

/* ===========================
   公共组件
   =========================== */
.btn-primary {
  display: inline-block;
  background: var(--c-primary);
  color: var(--c-white);
  font-weight: 700;
  font-size: 0.9375rem;
  padding: 12px 28px;
  border-radius: var(--radius);
  border: 2px solid var(--c-primary);
  transition: background var(--transition), color var(--transition);
  min-height: 44px;
  line-height: 1.4;
}
.btn-primary:hover, .btn-primary:focus {
  background: var(--c-primary-dark);
  border-color: var(--c-primary-dark);
}

.btn-outline {
  display: inline-block;
  background: transparent;
  color: var(--c-white);
  font-weight: 700;
  font-size: 0.9375rem;
  padding: 12px 28px;
  border-radius: var(--radius);
  border: 2px solid var(--c-white);
  transition: background var(--transition), color var(--transition);
  min-height: 44px;
  line-height: 1.4;
}
.btn-outline:hover, .btn-outline:focus {
  background: var(--c-white);
  color: var(--c-primary);
}

/* ===========================
   页面外框
   =========================== */
.page-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ===========================
   顶部双行导航
   =========================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--c-dark);
  color: var(--c-white);
  box-shadow: none;
}

.header-brand-row {
  background: var(--c-dark);
  border-bottom: 2px solid var(--c-primary);
  height: var(--header-height-brand);
  display: flex;
  align-items: center;
}

.header-nav-row {
  background: var(--c-primary);
  height: var(--header-height-nav);
  display: flex;
  align-items: center;
}

.header-inner {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gap);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--c-white);
  text-decoration: none;
  min-height: 44px;
}

.brand-logo {
  width: 36px;
  height: 36px;
  object-fit: contain;
}

.brand-name {
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--c-white);
  white-space: nowrap;
}

.header-contact {
  flex-shrink: 0;
}

.contact-btn {
  display: inline-flex;
  align-items: center;
  height: 40px;
  padding: 0 18px;
  background: var(--c-accent);
  color: var(--c-dark);
  font-weight: 700;
  font-size: 0.875rem;
  border-radius: var(--radius);
  border: 2px solid var(--c-accent);
  transition: background var(--transition), color var(--transition);
}
.contact-btn:hover, .contact-btn:focus {
  background: var(--c-accent-dark);
  border-color: var(--c-accent-dark);
  color: var(--c-white);
}

.main-nav ul {
  display: flex;
  gap: 4px;
  flex-wrap: nowrap;
  overflow-x: auto;
  scrollbar-width: none;
}
.main-nav ul::-webkit-scrollbar { display: none; }

.main-nav li a {
  display: inline-flex;
  align-items: center;
  height: 44px;
  padding: 0 14px;
  color: var(--c-white);
  font-size: 0.875rem;
  font-weight: 500;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: background var(--transition), border-color var(--transition);
}
.main-nav li a:hover,
.main-nav li a:focus,
.main-nav li a[aria-current="page"] {
  background: rgba(255,255,255,0.15);
  border-bottom-color: var(--c-accent);
}

/* ===========================
   首页 Hero
   =========================== */
.hero-section {
  position: relative;
  min-height: 45vh;
  background: var(--c-dark);
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg-text {
  position: absolute;
  right: -0.05em;
  top: 50%;
  transform: translateY(-50%);
  font-size: clamp(80px, 18vw, 200px);
  font-weight: 700;
  color: rgba(45,107,228,0.12);
  letter-spacing: -0.04em;
  pointer-events: none;
  user-select: none;
  line-height: 1;
}

.hero-inner {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 48px var(--gap);
  display: flex;
  justify-content: flex-end;
}

.hero-text {
  max-width: 560px;
  text-align: right;
}

.hero-eyebrow {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: 12px;
  padding: 4px 10px;
  border: 1.5px solid var(--c-accent);
}

.hero-text h1 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 700;
  color: var(--c-white);
  line-height: 1.2;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.hero-desc {
  font-size: 1rem;
  color: rgba(255,255,255,0.75);
  margin-bottom: 28px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
  flex-wrap: wrap;
}

/* ===========================
   主内容区（正文容器 main > div.wrap > article > section）
   =========================== */
.main-content {
  flex: 1;
}

.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: var(--section-gap) var(--gap);
}

.content-section {
  /* 直接子 article */
}

.page-article {
  max-width: var(--content-max);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.meta-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  background: var(--c-primary);
  color: var(--c-white);
  padding: 3px 10px;
}

.meta-date {
  font-size: 0.8125rem;
  color: var(--c-text-muted);
}

.page-article h1 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
  color: var(--c-dark);
}

.article-body {
  font-size: 1rem;
  line-height: var(--line-height-base);
  color: var(--c-text);
}

.article-body h2 {
  font-size: 1.375rem;
  font-weight: 700;
  margin: 40px 0 16px;
  color: var(--c-dark);
  border-left: 4px solid var(--c-primary);
  padding-left: 12px;
}

.article-body h2 > span {
  display: inline;
}

.article-body h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin: 28px 0 12px;
  color: var(--c-dark);
}

.article-body h3 > span {
  display: inline;
}

.article-body p {
  margin-bottom: 16px;
}

.article-body ul, .article-body ol {
  margin: 0 0 16px 20px;
  list-style: disc;
}
.article-body ol { list-style: decimal; }
.article-body li { margin-bottom: 6px; }

.article-body a {
  color: var(--c-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.article-body a:hover { color: var(--c-primary-dark); }

.article-body strong { font-weight: 700; }
.article-body em { font-style: italic; }

.article-body blockquote {
  border-left: 4px solid var(--c-accent);
  padding: 12px 16px;
  background: var(--c-bg-alt);
  margin: 20px 0;
  font-style: italic;
  color: var(--c-text-muted);
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 0.9375rem;
}
.article-body th {
  background: var(--c-dark);
  color: var(--c-white);
  font-weight: 600;
  padding: 10px 14px;
  text-align: left;
}
.article-body td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--c-border);
}
.article-body tr:nth-child(even) td { background: var(--c-bg-alt); }

.article-body code {
  font-family: 'Courier New', monospace;
  font-size: 0.875em;
  background: var(--c-bg-alt);
  padding: 2px 6px;
  border: 1px solid var(--c-border);
}

.article-body pre {
  background: var(--c-dark);
  color: #e8e8f0;
  padding: 20px;
  overflow-x: auto;
  margin: 20px 0;
  font-size: 0.875rem;
  line-height: 1.6;
}
.article-body pre code {
  background: none;
  border: none;
  padding: 0;
  color: inherit;
}

/* ===========================
   首页 指南卡片区
   =========================== */
.guides-section {
  background: var(--c-bg-alt);
  padding: var(--section-gap) 0;
  border-top: 3px solid var(--c-primary);
}

.section-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gap);
}

.section-title {
  font-size: 1.625rem;
  font-weight: 700;
  color: var(--c-dark);
  margin-bottom: 36px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.section-title > span {
  display: inline;
}

.section-title::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 1.2em;
  background: var(--c-accent);
  flex-shrink: 0;
}

/* 子页列表：ul > li > section > h3/p 结构抽签 */
.guide-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--gap);
}

.guide-grid > li > section.guide-card {
  background: var(--c-white);
  border: 1.5px solid var(--c-border);
  border-top: 3px solid var(--c-primary);
  padding: 24px;
  display: flex;
  gap: 16px;
  transition: border-color var(--transition);
  border-radius: var(--radius);
}

.guide-grid > li > section.guide-card:hover {
  border-top-color: var(--c-accent);
}

.card-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  background: var(--c-primary);
  color: var(--c-white);
  display: flex;
  align-items: center;
  justify-content: center;
}

.card-body {
  flex: 1;
  min-width: 0;
}

.card-body h3 {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--c-dark);
  margin-bottom: 8px;
  line-height: 1.4;
}
.card-body h3 > span { display: inline; }

.card-body p {
  font-size: 0.875rem;
  color: var(--c-text-muted);
  margin-bottom: 12px;
  line-height: 1.6;
}

.card-date {
  display: block;
  font-size: 0.75rem;
  color: var(--c-text-muted);
  margin-bottom: 10px;
}

.card-link {
  display: inline-flex;
  align-items: center;
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--c-primary);
  gap: 4px;
  transition: color var(--transition);
}
.card-link:hover { color: var(--c-primary-dark); }
.card-link::after {
  content: '→';
  font-size: 0.875em;
}

/* ===========================
   指南页布局（带左侧边栏 + 右侧边栏）
   =========================== */
.guide-layout-body {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr var(--aside-w);
  gap: 0;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gap);
  flex: 1;
  align-items: start;
}

.guide-sidebar-left {
  padding: 40px 20px 40px 0;
  position: sticky;
  top: var(--header-total);
  max-height: calc(100vh - var(--header-total));
  overflow-y: auto;
}

.sidebar-block {
  border-left: 3px solid var(--c-primary);
  padding-left: 16px;
}

.sidebar-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--c-text-muted);
  margin-bottom: 12px;
  text-transform: uppercase;
}

.sidebar-nav-list li a {
  display: flex;
  align-items: center;
  min-height: 40px;
  padding: 6px 8px;
  font-size: 0.875rem;
  color: var(--c-text);
  line-height: 1.4;
  border-left: 2px solid transparent;
  margin-left: -18px;
  padding-left: 16px;
  transition: color var(--transition), background var(--transition);
}
.sidebar-nav-list li a:hover,
.sidebar-nav-list li a.active {
  color: var(--c-primary);
  background: var(--c-bg-alt);
  border-left-color: var(--c-primary);
}

.guide-main {
  border-left: 1px solid var(--c-border);
  border-right: 1px solid var(--c-border);
}

.guide-main .wrap {
  padding: 40px 40px;
}

.guide-main .page-article {
  max-width: 100%;
}

/* 指南页右侧 aside */
.guide-aside-right {
  padding: 40px 0 40px 20px;
  position: sticky;
  top: var(--header-total);
  max-height: calc(100vh - var(--header-total));
  overflow-y: auto;
}

.guide-aside-right nav > ul,
.faq-aside nav > ul,
.changelog-aside nav > ul,
.about-aside nav > ul,
.privacy-aside nav > ul {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: 28px;
}

.guide-aside-right nav li a,
.faq-aside nav li a,
.changelog-aside nav li a,
.about-aside nav li a,
.privacy-aside nav li a {
  display: flex;
  align-items: center;
  min-height: 40px;
  padding: 6px 12px;
  font-size: 0.875rem;
  color: var(--c-text);
  background: var(--c-bg-alt);
  border-left: 3px solid transparent;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}
.guide-aside-right nav li a:hover,
.faq-aside nav li a:hover,
.changelog-aside nav li a:hover,
.about-aside nav li a:hover,
.privacy-aside nav li a:hover {
  background: var(--c-bg-alt);
  color: var(--c-primary);
  border-left-color: var(--c-primary);
}

.aside-block {
  background: var(--c-primary);
  padding: 16px;
  color: var(--c-white);
}

.aside-block-title {
  font-size: 0.875rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--c-white);
}

.aside-block-desc {
  font-size: 0.8125rem;
  line-height: 1.6;
  color: rgba(255,255,255,0.85);
  margin-bottom: 12px;
}

.aside-block-link {
  display: inline-flex;
  align-items: center;
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--c-accent);
  gap: 4px;
  transition: color var(--transition);
}
.aside-block-link:hover { color: var(--c-white); }
.aside-block-link::after { content: '→'; }

.aside-tip {
  background: var(--c-bg-alt);
  border-left: 3px solid var(--c-accent);
  padding: 16px;
}
.aside-tip-title {
  font-size: 0.875rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--c-dark);
}
.aside-tip p {
  font-size: 0.8125rem;
  color: var(--c-text-muted);
  margin-bottom: 12px;
  line-height: 1.6;
}

/* ===========================
   FAQ / Changelog / About / Privacy 页头
   =========================== */
.faq-page-header,
.changelog-page-header,
.about-page-header,
.privacy-page-header {
  background: var(--c-dark);
  color: var(--c-white);
  position: relative;
  overflow: hidden;
  padding: 48px var(--gap);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.faq-page-header-inner,
.changelog-header-inner,
.about-header-inner,
.privacy-header-inner {
  max-width: var(--max-w);
  width: 100%;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.page-eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--c-accent);
  margin-bottom: 12px;
  padding: 3px 10px;
  border: 1.5px solid var(--c-accent);
  text-transform: uppercase;
}

.faq-page-header h1,
.changelog-page-header h1,
.about-page-header h1,
.privacy-page-header h1 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--c-white);
  margin-bottom: 12px;
}

.page-date {
  display: block;
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.65);
  margin-top: 6px;
}

.faq-header-decor,
.changelog-header-decor,
.about-header-decor {
  font-size: clamp(60px, 12vw, 140px);
  font-weight: 700;
  color: rgba(255,255,255,0.06);
  letter-spacing: -0.04em;
  pointer-events: none;
  user-select: none;
  flex-shrink: 0;
  line-height: 1;
  margin-left: 24px;
}

/* ===========================
   FAQ / Changelog / About / Privacy body wrap
   =========================== */
.faq-body-wrap,
.changelog-body-wrap,
.about-body-wrap,
.privacy-body-wrap {
  display: grid;
  grid-template-columns: 1fr var(--aside-w);
  gap: 0;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gap);
  flex: 1;
  align-items: start;
}

.faq-main .wrap,
.changelog-main .wrap,
.about-main .wrap,
.privacy-main .wrap {
  padding: 40px 40px 40px 0;
}

.faq-aside,
.changelog-aside,
.about-aside,
.privacy-aside {
  padding: 40px 0 40px 20px;
  position: sticky;
  top: var(--header-total);
  max-height: calc(100vh - var(--header-total));
  overflow-y: auto;
  border-left: 1px solid var(--c-border);
}

/* ===========================
   Changelog 特色样式
   =========================== */
.changelog-body .article-body > ul,
.changelog-article .article-body > ul {
  list-style: none;
  margin: 0;
}

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

/* footer > div(cta) + div(main) + div(bottom) 结构 */
/* footer 内有 nav，footer 直接子层有分区容器 */

.footer-cta {
  background: var(--c-primary);
  padding: 40px var(--gap);
}

.footer-cta-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-cta-text {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--c-white);
}

.footer-main {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 48px var(--gap);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.footer-brand .brand-name {
  display: block;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--c-white);
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.65);
  line-height: 1.7;
}

/* footer > div > nav 满足：footer 内有 nav，footer 直接子层有分区容器 */
.footer-nav ul {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer-nav li a {
  display: flex;
  align-items: center;
  min-height: 40px;
  padding: 4px 0;
  font-size: 0.875rem;
  color: rgba(255,255,255,0.75);
  border-bottom: 1px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}
.footer-nav li a:hover {
  color: var(--c-accent);
  border-bottom-color: var(--c-accent);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 20px var(--gap);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-copy {
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.5);
}

.footer-links {
  display: flex;
  gap: 20px;
}
.footer-links a {
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.5);
  transition: color var(--transition);
}
.footer-links a:hover { color: var(--c-white); }

/* ===========================
   标题装饰 h2 > span / h3 > span
   =========================== */
h2 > span, h3 > span {
  display: inline;
}

/* ===========================
   动效（prefers-reduced-motion）
   =========================== */
@media (prefers-reduced-motion: no-preference) {
  .guide-grid > li {
    opacity: 0;
    transform: translateY(20px);
    animation: stagger-in 0.4s ease forwards;
  }
  .guide-grid > li:nth-child(1) { animation-delay: 0.05s; }
  .guide-grid > li:nth-child(2) { animation-delay: 0.10s; }
  .guide-grid > li:nth-child(3) { animation-delay: 0.15s; }
  .guide-grid > li:nth-child(4) { animation-delay: 0.20s; }
  .guide-grid > li:nth-child(5) { animation-delay: 0.25s; }
  .guide-grid > li:nth-child(6) { animation-delay: 0.30s; }
  .guide-grid > li:nth-child(7) { animation-delay: 0.35s; }
  .guide-grid > li:nth-child(8) { animation-delay: 0.40s; }
  .guide-grid > li:nth-child(9) { animation-delay: 0.45s; }

  @keyframes stagger-in {
    to { opacity: 1; transform: translateY(0); }
  }

  .hero-text {
    animation: fade-up 0.5s ease both;
  }
  @keyframes fade-up {
    from { opacity: 0; transform: translateY(24px); }
    to { opacity: 1; transform: translateY(0); }
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* ===========================
   响应式断点
   =========================== */
@media (max-width: 1024px) {
  .guide-layout-body {
    grid-template-columns: var(--sidebar-w) 1fr;
  }
  .guide-aside-right {
    display: none;
  }

  .faq-body-wrap,
  .changelog-body-wrap,
  .about-body-wrap,
  .privacy-body-wrap {
    grid-template-columns: 1fr;
  }
  .faq-aside,
  .changelog-aside,
  .about-aside,
  .privacy-aside {
    display: none;
  }
}

@media (max-width: 768px) {
  :root {
    --gap: 16px;
    --section-gap: 40px;
    --header-height-brand: 56px;
    --header-height-nav: 44px;
    --header-total: 100px;
  }

  .guide-layout-body {
    grid-template-columns: 1fr;
    padding: 0;
  }

  .guide-sidebar-left {
    display: none;
  }

  .guide-main {
    border: none;
  }

  .guide-main .wrap {
    padding: 32px var(--gap);
  }

  .faq-main .wrap,
  .changelog-main .wrap,
  .about-main .wrap,
  .privacy-main .wrap {
    padding: 32px 0;
  }

  .faq-body-wrap,
  .changelog-body-wrap,
  .about-body-wrap,
  .privacy-body-wrap {
    padding: 0 var(--gap);
  }

  .hero-inner {
    justify-content: flex-start;
    padding: 36px var(--gap);
  }

  .hero-text {
    text-align: right;
    max-width: 100%;
  }

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

  .hero-bg-text {
    font-size: 20vw;
    opacity: 0.5;
  }

  .footer-main {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 36px var(--gap);
  }

  .footer-cta-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .main-nav ul {
    gap: 0;
  }

  .main-nav li a {
    padding: 0 10px;
    font-size: 0.8125rem;
  }

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

  .faq-page-header,
  .changelog-page-header,
  .about-page-header,
  .privacy-page-header {
    padding: 36px var(--gap);
  }

  .faq-header-decor,
  .changelog-header-decor,
  .about-header-decor {
    display: none;
  }

  .wrap {
    padding: 32px var(--gap);
  }
}

@media (max-width: 480px) {
  .brand-name {
    font-size: 0.9375rem;
  }
  .hero-text h1 {
    font-size: 1.5rem;
  }
  .btn-primary, .btn-outline {
    padding: 10px 20px;
    font-size: 0.875rem;
  }
  .contact-btn {
    font-size: 0.8125rem;
    padding: 0 12px;
  }
}

/* ===========================
   无障碍：焦点样式
   =========================== */
:focus-visible {
  outline: 3px solid var(--c-accent);
  outline-offset: 2px;
}

/* ===========================
   打印
   =========================== */
@media print {
  .site-header, .site-footer, .guide-sidebar-left,
  .guide-aside-right, .faq-aside, .changelog-aside,
  .about-aside, .privacy-aside { display: none; }
  .article-body { max-width: 100%; }
}