:root {
  --brand: #c8102e;
  --brand-dark: #7a0a1c;
  --brand-light: #ffe3e8;
  --accent: #1b4d7a;
  --accent-2: #2e7d5b;
  --bg: #f7f5f2;
  --bg-elevated: #ffffff;
  --bg-soft: #efeae4;
  --text: #1f1b18;
  --text-soft: #5c544d;
  --text-muted: #8a8178;
  --border: #e3dcd4;
  --shadow-sm: 0 2px 8px rgba(31, 27, 24, 0.06);
  --shadow-md: 0 8px 24px rgba(31, 27, 24, 0.1);
  --shadow-lg: 0 16px 48px rgba(31, 27, 24, 0.14);
  --glass-bg: rgba(255, 255, 255, 0.72);
  --glass-border: rgba(255, 255, 255, 0.5);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 32px;
  --max-width: 1180px;
  --header-height: 68px;
  --transition: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
}

[data-theme="dark"] {
  --brand: #e8445f;
  --brand-dark: #a81734;
  --brand-light: #3a1520;
  --accent: #6fa8d6;
  --accent-2: #5bbf95;
  --bg: #121013;
  --bg-elevated: #1c191d;
  --bg-soft: #262229;
  --text: #f0ebe6;
  --text-soft: #b8b0a8;
  --text-muted: #857c75;
  --border: #332e36;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.6);
  --glass-bg: rgba(28, 25, 29, 0.72);
  --glass-border: rgba(255, 255, 255, 0.08);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  background-image:
    radial-gradient(circle at 12% 8%, rgba(200, 16, 46, 0.06), transparent 42%),
    radial-gradient(circle at 88% 22%, rgba(27, 77, 122, 0.06), transparent 46%),
    radial-gradient(circle at 50% 96%, rgba(46, 125, 91, 0.05), transparent 50%);
  background-attachment: fixed;
  transition: background-color var(--transition), color var(--transition);
  overflow-x: hidden;
}

[data-theme="dark"] body {
  background-image:
    radial-gradient(circle at 12% 8%, rgba(232, 68, 95, 0.08), transparent 42%),
    radial-gradient(circle at 88% 22%, rgba(111, 168, 214, 0.06), transparent 46%),
    radial-gradient(circle at 50% 96%, rgba(91, 191, 149, 0.05), transparent 50%);
}

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

a {
  color: var(--brand);
  text-decoration: none;
  transition: color var(--transition), opacity var(--transition);
}

a:hover {
  color: var(--brand-dark);
  text-decoration: underline;
  text-underline-offset: 3px;
}

[data-theme="dark"] a:hover {
  color: var(--brand);
}

h1, h2, h3, h4 {
  line-height: 1.35;
  color: var(--text);
  font-weight: 700;
  margin: 0 0 0.6em;
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(1.7rem, 4vw, 2.5rem); }
h2 { font-size: clamp(1.35rem, 3vw, 1.9rem); }
h3 { font-size: clamp(1.1rem, 2.2vw, 1.35rem); }

p {
  margin: 0 0 1em;
  color: var(--text-soft);
}

ul, ol {
  padding-left: 1.4em;
  color: var(--text-soft);
}

li {
  margin-bottom: 0.4em;
}

blockquote {
  margin: 1.2em 0;
  padding: 1em 1.4em;
  border-left: 4px solid var(--brand);
  background: var(--bg-soft);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--text-soft);
  font-style: normal;
}

blockquote p {
  margin: 0.4em 0;
}

blockquote p:last-child {
  margin-bottom: 0;
}

address {
  font-style: normal;
}

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

input,
button {
  font-size: 1rem;
}

:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 999;
  padding: 10px 18px;
  background: var(--brand);
  color: #fff;
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: top var(--transition);
}

.skip-link:focus {
  top: 12px;
  color: #fff;
  text-decoration: none;
}

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

/* ============ 头部 ============ */
#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
  transition: background var(--transition), box-shadow var(--transition);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--header-height);
  display: flex;
  align-items: center;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.brand-logo {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(200, 16, 46, 0.3);
  transition: transform var(--transition), box-shadow var(--transition);
}

.brand:hover .brand-logo {
  transform: rotate(-6deg) scale(1.06);
  box-shadow: 0 6px 18px rgba(200, 16, 46, 0.42);
}

.brand-name {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: 0.01em;
  white-space: nowrap;
}

#main-nav {
  flex: 1;
  min-width: 0;
}

#main-nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
  flex-wrap: nowrap;
  overflow-x: auto;
  scrollbar-width: none;
}

#main-nav ul::-webkit-scrollbar {
  display: none;
}

#main-nav a {
  display: inline-block;
  padding: 8px 12px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-soft);
  border-radius: var(--radius-sm);
  white-space: nowrap;
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

#main-nav a:hover {
  background: var(--brand-light);
  color: var(--brand);
  text-decoration: none;
  transform: translateY(-1px);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.site-search {
  display: flex;
  align-items: center;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 999px;
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.site-search:focus-within {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(200, 16, 46, 0.14);
}

.site-search input {
  width: 150px;
  padding: 8px 14px;
  border: none;
  background: transparent;
  color: var(--text);
  font-size: 0.88rem;
  outline: none;
}

.site-search input::placeholder {
  color: var(--text-muted);
}

.site-search button {
  padding: 8px 16px;
  background: var(--brand);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 600;
  transition: background var(--transition);
}

.site-search button:hover {
  background: var(--brand-dark);
}

#theme-toggle,
#menu-toggle {
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-soft);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

#theme-toggle:hover,
#menu-toggle:hover {
  background: var(--brand-light);
  color: var(--brand);
  transform: translateY(-1px);
}

#menu-toggle {
  display: none;
}

/* ============ 横幅 ============ */
#banner {
  position: relative;
  max-width: var(--max-width);
  margin: 28px auto 0;
  padding: 0 24px;
}

.banner-slides {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  background: var(--bg-elevated);
}

.banner-slide {
  position: relative;
  display: none;
  animation: bannerFade 0.6s ease both;
}

.banner-slide.is-active {
  display: block;
}

@keyframes bannerFade {
  from { opacity: 0; transform: scale(1.015); }
  to { opacity: 1; transform: scale(1); }
}

.banner-svg {
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 1;
  object-fit: cover;
}

.banner-caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: clamp(18px, 4vw, 40px);
  background: linear-gradient(to top, rgba(0, 0, 0, 0.62), rgba(0, 0, 0, 0.18) 60%, transparent);
  color: #fff;
}

.banner-caption h2 {
  color: #fff;
  margin-bottom: 0.3em;
  font-size: clamp(1.15rem, 2.6vw, 1.9rem);
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
}

.banner-caption p {
  color: rgba(255, 255, 255, 0.9);
  margin: 0;
  font-size: clamp(0.85rem, 1.6vw, 1.05rem);
  max-width: 720px;
}

.banner-controls {
  position: absolute;
  right: 44px;
  bottom: 44px;
  display: flex;
  gap: 8px;
  z-index: 5;
}

.banner-controls button {
  padding: 7px 16px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  color: #fff;
  background: rgba(255, 255, 255, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.35);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition: background var(--transition), transform var(--transition);
}

.banner-controls button:hover {
  background: rgba(255, 255, 255, 0.32);
  transform: translateY(-2px);
}

/* ============ 面包屑 ============ */
.breadcrumb {
  max-width: var(--max-width);
  margin: 20px auto 0;
  padding: 0 24px;
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.breadcrumb li:not(:last-child)::after {
  content: "/";
  margin-left: 6px;
  color: var(--text-muted);
  opacity: 0.6;
}

.breadcrumb a {
  color: var(--text-soft);
}

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

.breadcrumb [aria-current="page"] {
  color: var(--brand);
  font-weight: 600;
}

/* ============ 主内容区 ============ */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px 60px;
}

main > section {
  margin-top: 48px;
  padding: clamp(22px, 4vw, 44px);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition), background var(--transition);
  animation: riseIn 0.7s cubic-bezier(0.22, 1, 0.36, 1) both;
  animation-timeline: view();
  animation-range: entry 0% entry 34%;
}

@supports not (animation-timeline: view()) {
  main > section {
    animation: none;
    opacity: 1;
  }
}

@keyframes riseIn {
  from {
    opacity: 0;
    transform: translateY(28px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

main > section:hover {
  box-shadow: var(--shadow-md);
  border-color: color-mix(in srgb, var(--brand) 22%, var(--border));
}

main > section#banner,
main > section#intro {
  margin-top: 36px;
}

#intro {
  background:
    linear-gradient(135deg, rgba(200, 16, 46, 0.05), transparent 55%),
    var(--bg-elevated);
}

#intro h1 {
  position: relative;
  padding-bottom: 0.5em;
}

#intro h1::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 76px;
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--brand), var(--brand-dark));
}

.lead {
  font-size: 1.05rem;
  color: var(--text-soft);
  line-height: 1.85;
}

#brand-intro,
#brand-history,
#brand-culture,
#team-intro,
#drama-category,
#drama-info,
#drama-guide,
#drama-watch,
#drama-advantage,
#solution-commute,
#solution-night,
#solution-weekend,
#solution-family,
#app-entertainment,
#app-learning,
#app-social,
#app-marketing,
#case-1,
#case-2,
#case-3,
#case-4,
#testimonial,
#knowledge-term,
#knowledge-evaluate,
#knowledge-safety,
#service-promise,
#security {
  position: relative;
  padding-left: 18px;
}

#brand-intro::before,
#brand-history::before,
#brand-culture::before,
#team-intro::before,
#drama-category::before,
#drama-info::before,
#drama-guide::before,
#drama-watch::before,
#drama-advantage::before,
#solution-commute::before,
#solution-night::before,
#solution-weekend::before,
#solution-family::before,
#app-entertainment::before,
#app-learning::before,
#app-social::before,
#app-marketing::before,
#case-1::before,
#case-2::before,
#case-3::before,
#case-4::before,
#testimonial::before,
#knowledge-term::before,
#knowledge-evaluate::before,
#knowledge-safety::before,
#service-promise::before,
#security::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.35em;
  width: 4px;
  height: 1.1em;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--brand), transparent);
}

/* ============ 新闻列表 ============ */
.news-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.news-list li {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: baseline;
  padding: 14px 16px;
  margin-bottom: 10px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-soft);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background var(--transition);
}

.news-list li:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-sm);
  border-color: var(--brand);
  background: var(--bg-elevated);
}

.news-list time {
  flex-shrink: 0;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--brand);
  font-variant-numeric: tabular-nums;
  padding: 2px 10px;
  background: var(--brand-light);
  border-radius: 999px;
}

/* ============ 文章卡片 ============ */
.article-card {
  position: relative;
  padding: 24px 26px;
  margin-bottom: 18px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background var(--transition);
}

.article-card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  box-shadow: inset 0 0 0 1px transparent;
  transition: box-shadow var(--transition);
}

.article-card:hover {
  transform: translateY(-4px);
  background: var(--bg-elevated);
  border-color: color-mix(in srgb, var(--brand) 40%, var(--border));
  box-shadow: var(--shadow-md);
}

.article-card:hover::after {
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--brand) 22%, transparent);
}

.article-card h3 {
  margin-bottom: 0.4em;
  transition: color var(--transition);
}

.article-card:hover h3 {
  color: var(--brand);
}

.article-card .meta {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 0.8em;
  letter-spacing: 0.01em;
}

.article-card p {
  margin-bottom: 0.9em;
}

.article-card > a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--brand);
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--brand-light);
  transition: gap var(--transition), background var(--transition), color var(--transition);
}

.article-card > a::after {
  content: "→";
  transition: transform var(--transition);
}

.article-card > a:hover {
  gap: 10px;
  background: var(--brand);
  color: #fff;
  text-decoration: none;
}

.article-card > a:hover::after {
  transform: translateX(3px);
}

/* ============ HowTo ============ */
#howto ol {
  counter-reset: howto;
  list-style: none;
  padding: 0;
}

#howto ol li {
  counter-increment: howto;
  position: relative;
  padding: 14px 18px 14px 58px;
  margin-bottom: 10px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

#howto ol li::before {
  content: counter(howto);
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  font-size: 0.85rem;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--brand-dark));
  box-shadow: 0 4px 10px rgba(200, 16, 46, 0.28);
}

#howto ol li:hover {
  transform: translateX(6px);
  border-color: var(--brand);
  box-shadow: var(--shadow-sm);
}

/* ============ FAQ ============ */
.faq-list {
  display: grid;
  gap: 12px;
}

.faq-list details {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

.faq-list details:hover {
  border-color: color-mix(in srgb, var(--brand) 45%, var(--border));
}

.faq-list details[open] {
  background: var(--bg-elevated);
  border-color: var(--brand);
  box-shadow: var(--shadow-sm);
}

.faq-list summary {
  position: relative;
  padding: 16px 52px 16px 20px;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  list-style: none;
  transition: color var(--transition), background var(--transition);
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary::after {
  content: "";
  position: absolute;
  right: 20px;
  top: 50%;
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--brand);
  border-bottom: 2px solid var(--brand);
  transform: translateY(-70%) rotate(45deg);
  transition: transform var(--transition);
}

.faq-list details[open] summary::after {
  transform: translateY(-30%) rotate(-135deg);
}

.faq-list summary:hover {
  color: var(--brand);
  background: var(--brand-light);
}

.faq-list details p {
  margin: 0;
  padding: 0 20px 18px;
  color: var(--text-soft);
  animation: faqOpen 0.32s ease both;
}

@keyframes faqOpen {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============ 联系方式 ============ */
#contact address {
  display: grid;
  gap: 10px;
  padding: 20px 24px;
  margin-bottom: 1.2em;
  background: linear-gradient(135deg, var(--brand-light), transparent 80%), var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

#contact address p {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

#contact address a {
  font-weight: 600;
}

/* ============ 站点地图 & 友链 ============ */
.sitemap-list,
.friend-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.sitemap-list li,
.friend-links li {
  margin: 0;
}

.sitemap-list a,
.friend-links a {
  display: inline-block;
  padding: 8px 18px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-soft);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 999px;
  transition: transform var(--transition), background var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.sitemap-list a:hover,
.friend-links a:hover {
  transform: translateY(-2px);
  background: var(--brand);
  border-color: var(--brand);
  color: #fff;
  text-decoration: none;
  box-shadow: 0 6px 16px rgba(200, 16, 46, 0.28);
}

/* ============ 页脚 ============ */
#site-footer {
  position: relative;
  margin-top: 40px;
  background:
    linear-gradient(180deg, transparent, rgba(0, 0, 0, 0.03)),
    var(--bg-elevated);
  border-top: 1px solid var(--border);
}

[data-theme="dark"] #site-footer {
  background:
    linear-gradient(180deg, transparent, rgba(0, 0, 0, 0.3)),
    var(--bg-elevated);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 48px 24px 32px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 28px 36px;
}

.footer-inner section h2 {
  font-size: 1rem;
  margin-bottom: 0.6em;
  position: relative;
  padding-left: 14px;
}

.footer-inner section h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.3em;
  width: 4px;
  height: 1em;
  border-radius: 2px;
  background: var(--brand);
}

.footer-inner section p {
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--text-muted);
  margin: 0;
}

.copyright-line,
.update-line {
  grid-column: 1 / -1;
  margin: 0;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  font-size: 0.82rem;
  color: var(--text-muted);
  text-align: center;
}

.update-line {
  padding-top: 6px;
  border-top: none;
}

/* ============ 返回顶部 ============ */
#back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 90;
  padding: 12px 18px;
  font-size: 0.85rem;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--brand-dark));
  border-radius: 999px;
  box-shadow: 0 8px 24px rgba(200, 16, 46, 0.36);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition), box-shadow var(--transition);
}

#back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

#back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 30px rgba(200, 16, 46, 0.5);
}

/* ============ 响应式 ============ */
@media (max-width: 1080px) {
  .site-search input {
    width: 110px;
  }
}

@media (max-width: 920px) {
  .header-inner {
    height: auto;
    min-height: var(--header-height);
    flex-wrap: wrap;
    padding: 12px 20px;
    gap: 12px;
  }

  #main-nav {
    order: 3;
    flex-basis: 100%;
  }

  #main-nav ul {
    padding-bottom: 4px;
  }

  .header-actions {
    margin-left: auto;
  }

  #menu-toggle {
    display: inline-block;
  }

  #main-nav {
    display: none;
  }

  #main-nav.is-open {
    display: block;
    animation: navDrop 0.3s ease both;
  }

  @keyframes navDrop {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
  }

  .banner-controls {
    right: 28px;
    bottom: 28px;
  }
}

@media (max-width: 720px) {
  body {
    font-size: 15px;
  }

  .header-inner {
    padding: 10px 16px;
  }

  .brand-name {
    font-size: 1.02rem;
  }

  .site-search {
    flex: 1;
    min-width: 0;
  }

  .site-search input {
    width: 100%;
    min-width: 0;
  }

  .site-search button {
    padding: 8px 12px;
  }

  #theme-toggle {
    padding: 8px 10px;
    font-size: 0.78rem;
  }

  #banner,
  .breadcrumb,
  main {
    padding-left: 16px;
    padding-right: 16px;
  }

  #banner {
    margin-top: 18px;
  }

  .banner-svg {
    aspect-ratio: 4 / 3;
  }

  .banner-caption {
    padding: 16px;
  }

  .banner-controls {
    right: 16px;
    bottom: 16px;
  }

  .banner-controls button {
    padding: 6px 12px;
    font-size: 0.74rem;
  }

  main > section {
    margin-top: 32px;
    padding: 20px 18px;
    border-radius: var(--radius-md);
  }

  .article-card {
    padding: 18px;
  }

  .news-list li {
    padding: 12px;
  }

  .footer-inner {
    padding: 36px 16px 24px;
    gap: 22px;
  }

  #back-to-top {
    right: 14px;
    bottom: 14px;
    padding: 10px 14px;
    font-size: 0.78rem;
  }
}

@media (max-width: 420px) {
  .brand-name {
    display: none;
  }

  .banner-caption h2 {
    font-size: 1rem;
  }

  .banner-caption p {
    font-size: 0.8rem;
  }

  .faq-list summary {
    padding: 14px 44px 14px 16px;
    font-size: 0.92rem;
  }

  .faq-list details p {
    padding: 0 16px 16px;
    font-size: 0.9rem;
  }
}

/* ============ 动效降级 ============ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ============ 打印 ============ */
@media print {
  #site-header,
  #back-to-top,
  .banner-controls,
  .header-actions,
  .site-search {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
  }

  main > section {
    box-shadow: none;
    border: 1px solid #ccc;
    page-break-inside: avoid;
  }

  a {
    color: #000;
    text-decoration: underline;
  }
}