:root {
  --bg-body: #f7f9fc;
  --bg-card: #ffffff;
  --bg-nav: rgba(11, 34, 57, 0.72);
  --bg-footer: #0b1a2e;
  --bg-banner: linear-gradient(135deg, #0b2239 0%, #1a3a5c 55%, #2a5a8c 100%);
  --bg-section-alt: #eef2f7;
  --bg-tag: #e2e8f0;
  --bg-btn: #1a3a5c;
  --bg-btn-hover: #0b2239;
  --bg-faq: #ffffff;
  --bg-faq-open: #f0f5fa;
  --glass-bg: rgba(255, 255, 255, 0.55);
  --glass-border: rgba(255, 255, 255, 0.65);
  --glass-shadow: 0 8px 32px rgba(11, 34, 57, 0.12);
  --text-primary: #17202a;
  --text-secondary: #1f2937;
  --text-muted: #334155;
  --text-light: #e5e7eb;
  --text-heading: #0b1a2e;
  --text-nav: #f0f4f8;
  --text-nav-hover: #ffffff;
  --text-footer: #cbd5e1;
  --text-footer-heading: #f8fafc;
  --text-link: #1a5a8c;
  --text-link-hover: #0b3a5c;
  --text-btn: #ffffff;
  --text-tag: #1f2937;
  --border-color: #cbd5e1;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 12px 32px rgba(11, 34, 57, 0.16);
  --radius: 14px;
  --radius-sm: 10px;
  --radius-pill: 999px;
  --transition: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg-body: #0f172a;
  --bg-card: #1e293b;
  --bg-nav: rgba(11, 17, 32, 0.72);
  --bg-footer: #0b1120;
  --bg-banner: linear-gradient(135deg, #0b1120 0%, #16243c 55%, #1e3a5c 100%);
  --bg-section-alt: #162032;
  --bg-tag: #334155;
  --bg-btn: #3b82f6;
  --bg-btn-hover: #2563eb;
  --bg-faq: #1e293b;
  --bg-faq-open: #263348;
  --glass-bg: rgba(30, 41, 59, 0.55);
  --glass-border: rgba(148, 163, 184, 0.25);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
  --text-primary: #e5e7eb;
  --text-secondary: #e2e8f0;
  --text-muted: #cbd5e1;
  --text-light: #f1f5f9;
  --text-heading: #f8fafc;
  --text-nav: #e2e8f0;
  --text-nav-hover: #ffffff;
  --text-footer: #94a3b8;
  --text-footer-heading: #f1f5f9;
  --text-link: #60a5fa;
  --text-link-hover: #93c5fd;
  --text-btn: #ffffff;
  --text-tag: #e2e8f0;
  --border-color: #334155;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.6);
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 16px;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--text-link);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--text-link-hover);
  text-decoration: underline;
}

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

h1 { font-size: 2.2rem; }
h2 { font-size: 1.75rem; margin-bottom: 1rem; }
h3 { font-size: 1.3rem; margin-bottom: 0.75rem; }
h4 { font-size: 1.1rem; margin-bottom: 0.5rem; }

p {
  color: var(--text-primary);
  margin-bottom: 1rem;
}

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

button {
  font-family: inherit;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-nav);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  backdrop-filter: blur(18px) saturate(180%);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow-md);
  transition: background var(--transition), box-shadow var(--transition);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  max-width: 1200px;
  margin: 0 auto;
  gap: 16px;
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-nav);
  letter-spacing: 1px;
  white-space: nowrap;
  transition: transform var(--transition);
}

.nav-logo:hover {
  transform: scale(1.04);
}

.nav-logo span {
  color: #60a5fa;
  text-shadow: 0 0 18px rgba(96, 165, 250, 0.55);
}

.nav-links {
  display: flex;
  gap: 22px;
  list-style: none;
  align-items: center;
}

.nav-links a {
  position: relative;
  color: var(--text-nav);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, #60a5fa, #93c5fd);
  border-radius: 2px;
  transition: width var(--transition);
}

.nav-links a:hover {
  color: var(--text-nav-hover);
  text-decoration: none;
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-shrink: 0;
}

.theme-toggle,
.menu-toggle {
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--text-nav);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 6px 12px;
  font-size: 0.9rem;
  line-height: 1.4;
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  transition: background var(--transition), transform var(--transition), border-color var(--transition);
}

.theme-toggle:hover,
.menu-toggle:hover {
  background: rgba(255, 255, 255, 0.22);
  border-color: rgba(255, 255, 255, 0.4);
  transform: translateY(-1px);
}

.theme-toggle:active,
.menu-toggle:active {
  transform: scale(0.95);
}

.menu-toggle {
  display: none;
}

.search-box {
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  padding: 4px 10px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  transition: border-color var(--transition), background var(--transition);
}

.search-box:focus-within {
  border-color: #60a5fa;
  background: rgba(255, 255, 255, 0.16);
}

.search-box input {
  background: transparent;
  border: none;
  color: var(--text-nav);
  padding: 6px;
  font-size: 0.9rem;
  outline: none;
  width: 140px;
  transition: width var(--transition);
}

.search-box input:focus {
  width: 180px;
}

.search-box input::placeholder {
  color: #94a3b8;
}

.search-box button {
  background: transparent;
  border: none;
  color: var(--text-nav);
  cursor: pointer;
  font-size: 1rem;
  padding: 2px 4px;
  transition: transform var(--transition);
}

.search-box button:hover {
  transform: scale(1.15);
}

.banner {
  position: relative;
  background: var(--bg-banner);
  color: #ffffff;
  padding: 90px 20px 80px;
  text-align: center;
  overflow: hidden;
  isolation: isolate;
}

.banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 80% at 20% 30%, rgba(96, 165, 250, 0.22) 0%, transparent 65%),
    radial-gradient(ellipse 50% 70% at 85% 75%, rgba(147, 197, 253, 0.16) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}

.banner::after {
  content: "";
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.6;
  pointer-events: none;
  z-index: 0;
}

.banner h1 {
  position: relative;
  z-index: 1;
  color: #ffffff;
  font-size: 2.6rem;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
  text-shadow: 0 2px 24px rgba(0, 0, 0, 0.25);
  animation: bannerFadeUp 0.8s ease both;
}

.banner p {
  position: relative;
  z-index: 1;
  color: #dbeafe;
  font-size: 1.15rem;
  max-width: 700px;
  margin: 0 auto 28px;
  animation: bannerFadeUp 0.8s 0.12s ease both;
}

.banner-tags {
  position: relative;
  z-index: 1;
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  animation: bannerFadeUp 0.8s 0.24s ease both;
}

.banner-tags span {
  background: rgba(255, 255, 255, 0.14);
  color: #ffffff;
  padding: 7px 20px;
  border-radius: var(--radius-pill);
  font-size: 0.9rem;
  border: 1px solid rgba(255, 255, 255, 0.25);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition: background var(--transition), transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  cursor: default;
}

.banner-tags span:hover {
  background: rgba(255, 255, 255, 0.28);
  border-color: rgba(255, 255, 255, 0.5);
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

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

.section {
  padding: 64px 0;
}

.section-alt {
  background: var(--bg-section-alt);
  transition: background var(--transition);
}

.section-title {
  text-align: center;
  margin-bottom: 44px;
}

.section-title h2 {
  font-size: 1.9rem;
  position: relative;
  display: inline-block;
  padding-bottom: 14px;
}

.section-title h2::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  width: 56px;
  height: 4px;
  border-radius: 4px;
  background: linear-gradient(90deg, #1a5a8c, #60a5fa);
}

[data-theme="dark"] .section-title h2::after {
  background: linear-gradient(90deg, #3b82f6, #93c5fd);
}

.section-title p {
  color: var(--text-muted);
  max-width: 640px;
  margin: 12px auto 0;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 24px;
}

.card {
  position: relative;
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background var(--transition);
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, #1a5a8c, #60a5fa, #93c5fd);
  opacity: 0;
  transition: opacity var(--transition);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(96, 165, 250, 0.4);
}

.card:hover::before {
  opacity: 1;
}

.card h3 {
  color: var(--text-heading);
  transition: color var(--transition);
}

.card:hover h3 {
  color: var(--text-link);
}

.card p {
  color: var(--text-primary);
  font-size: 0.95rem;
}

.card-icon {
  font-size: 2rem;
  margin-bottom: 12px;
  display: inline-block;
  transition: transform var(--transition);
}

.card:hover .card-icon {
  transform: scale(1.12) rotate(-4deg);
}

.article-item {
  position: relative;
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 22px 26px;
  margin-bottom: 16px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition), background var(--transition);
  overflow: hidden;
}

.article-item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, #60a5fa, #1a5a8c);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--transition);
}

.article-item:hover {
  box-shadow: var(--shadow-lg);
  transform: translateX(4px);
  border-color: rgba(96, 165, 250, 0.35);
}

.article-item:hover::after {
  transform: scaleY(1);
}

.article-item h3 {
  font-size: 1.15rem;
  margin-bottom: 6px;
  transition: color var(--transition);
}

.article-item h3 a {
  color: var(--text-heading);
  transition: color var(--transition);
}

.article-item h3 a:hover {
  color: var(--text-link);
  text-decoration: none;
}

.article-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-item p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.read-more {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-link);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap var(--transition), color var(--transition);
}

.read-more:hover {
  color: var(--text-link-hover);
  gap: 10px;
  text-decoration: none;
}

.faq-item {
  background: var(--bg-faq);
  border-radius: var(--radius);
  margin-bottom: 12px;
  border: 1px solid var(--border-color);
  overflow: hidden;
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.faq-item:hover {
  border-color: rgba(96, 165, 250, 0.4);
  box-shadow: var(--shadow-sm);
}

.faq-item.open {
  background: var(--bg-faq-open);
  border-color: rgba(96, 165, 250, 0.5);
  box-shadow: var(--shadow-md);
}

.faq-question {
  padding: 18px 22px;
  cursor: pointer;
  font-weight: 600;
  color: var(--text-heading);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1rem;
  user-select: none;
  gap: 16px;
  transition: background var(--transition), color var(--transition);
}

.faq-question:hover {
  background: var(--bg-faq-open);
}

.faq-question .arrow {
  transition: transform var(--transition), color var(--transition);
  font-size: 0.8rem;
  color: var(--text-muted);
  flex-shrink: 0;
}

.faq-item.open .faq-question .arrow {
  transform: rotate(180deg);
  color: var(--text-link);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
  padding: 0 22px;
  color: var(--text-primary);
  font-size: 0.95rem;
}

.faq-item.open .faq-answer {
  max-height: 500px;
  padding: 0 22px 20px;
}

.howto-step {
  position: relative;
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 16px;
  border-left: 4px solid #3b82f6;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background var(--transition);
}

.howto-step:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
  border-left-color: #60a5fa;
}

.howto-step h4 {
  color: var(--text-heading);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
}

.howto-step p {
  color: var(--text-primary);
  font-size: 0.95rem;
  margin-bottom: 0;
}

.howto-step .step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #1a3a5c, #2a5a8c);
  color: #ffffff;
  width: 28px;
  height: 28px;
  line-height: 1;
  text-align: center;
  border-radius: 50%;
  font-weight: 700;
  font-size: 0.85rem;
  margin-right: 10px;
  flex-shrink: 0;
  box-shadow: 0 4px 10px rgba(26, 58, 92, 0.35);
}

[data-theme="dark"] .howto-step .step-num {
  background: linear-gradient(135deg, #3b82f6, #60a5fa);
  box-shadow: 0 4px 10px rgba(59, 130, 246, 0.4);
}

.info-table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.info-table th,
.info-table td {
  padding: 12px 16px;
  text-align: left;
  border: 1px solid var(--border-color);
  font-size: 0.95rem;
}

.info-table th {
  background: var(--bg-section-alt);
  color: var(--text-heading);
  font-weight: 600;
}

.info-table td {
  color: var(--text-primary);
}

.tag {
  display: inline-block;
  background: var(--bg-tag);
  color: var(--text-tag);
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  margin: 3px 4px 3px 0;
  border: 1px solid var(--border-color);
  transition: transform var(--transition), background var(--transition), border-color var(--transition);
}

.tag:hover {
  transform: translateY(-2px);
  border-color: #60a5fa;
}

.btn {
  display: inline-block;
  background: var(--bg-btn);
  color: var(--text-btn);
  padding: 12px 32px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  position: relative;
  overflow: hidden;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}

.btn::after {
  content: "";
  position: absolute;
  top: 0;
  left: -120%;
  width: 60%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.28), transparent);
  transform: skewX(-20deg);
  transition: left 0.6s ease;
}

.btn:hover {
  background: var(--bg-btn-hover);
  color: var(--text-btn);
  text-decoration: none;
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.btn:hover::after {
  left: 140%;
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--text-btn);
  color: var(--text-btn);
}

.btn-outline:hover {
  background: var(--text-btn);
  color: var(--bg-btn);
}

.breadcrumb {
  padding: 14px 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

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

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

.breadcrumb span {
  margin: 0 6px;
}

footer {
  background: var(--bg-footer);
  color: var(--text-footer);
  padding: 50px 0 20px;
  transition: background var(--transition);
  position: relative;
}

footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(96, 165, 250, 0.5), transparent);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
  margin-bottom: 32px;
}

.footer-grid h4 {
  color: var(--text-footer-heading);
  margin-bottom: 14px;
  font-size: 1rem;
  position: relative;
  padding-bottom: 10px;
}

.footer-grid h4::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 28px;
  height: 2px;
  background: #60a5fa;
  border-radius: 2px;
}

.footer-grid p,
.footer-grid a {
  color: var(--text-footer);
  font-size: 0.9rem;
  display: block;
  margin-bottom: 8px;
  transition: color var(--transition), transform var(--transition);
}

.footer-grid a:hover {
  color: #93c5fd;
  text-decoration: none;
  transform: translateX(4px);
}

.footer-bottom {
  border-top: 1px solid #1e293b;
  padding-top: 20px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-footer);
}

.footer-bottom p {
  color: var(--text-footer);
  margin-bottom: 6px;
}

.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  z-index: 999;
  background: var(--bg-btn);
  color: var(--text-btn);
  width: 46px;
  height: 46px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: opacity var(--transition), visibility var(--transition), transform var(--transition), background var(--transition);
  border: none;
}

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

.back-to-top:hover {
  background: var(--bg-btn-hover);
  transform: translateY(-4px);
  box-shadow: 0 16px 36px rgba(11, 34, 57, 0.3);
}

.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
  will-change: opacity, transform;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.stat-number {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-heading);
  line-height: 1.2;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-muted);
}

::selection {
  background: rgba(96, 165, 250, 0.35);
  color: var(--text-heading);
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-body);
}

::-webkit-scrollbar-thumb {
  background: #94a3b8;
  border-radius: 6px;
  border: 2px solid var(--bg-body);
}

::-webkit-scrollbar-thumb:hover {
  background: #64748b;
}

[data-theme="dark"] ::-webkit-scrollbar-thumb {
  background: #475569;
}

[data-theme="dark"] ::-webkit-scrollbar-thumb:hover {
  background: #64748b;
}

@media (max-width: 900px) {
  .nav-links {
    display: none;
  }

  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-nav);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    backdrop-filter: blur(20px) saturate(180%);
    padding: 20px;
    gap: 16px;
    box-shadow: var(--shadow-lg);
    border-bottom: 1px solid var(--glass-border);
    animation: slideDown 0.3s ease;
  }

  @keyframes slideDown {
    from {
      opacity: 0;
      transform: translateY(-12px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  .menu-toggle {
    display: block;
  }

  .search-box {
    display: none;
  }

  .banner h1 {
    font-size: 1.8rem;
  }

  .banner p {
    font-size: 1rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .section {
    padding: 48px 0;
  }
}

@media (max-width: 600px) {
  body {
    font-size: 15px;
  }

  .container {
    padding: 0 14px;
  }

  .nav-inner {
    padding: 10px 14px;
  }

  .nav-logo {
    font-size: 1.25rem;
  }

  .banner {
    padding: 56px 16px 46px;
  }

  .banner h1 {
    font-size: 1.5rem;
  }

  .banner p {
    font-size: 0.95rem;
  }

  .banner-tags span {
    padding: 5px 14px;
    font-size: 0.82rem;
  }

  .section {
    padding: 40px 0;
  }

  .section-title {
    margin-bottom: 32px;
  }

  .section-title h2 {
    font-size: 1.35rem;
  }

  .card {
    padding: 20px;
  }

  .article-item {
    padding: 18px;
  }

  .faq-question {
    padding: 15px 16px;
    font-size: 0.95rem;
  }

  .faq-answer {
    padding: 0 16px;
  }

  .faq-item.open .faq-answer {
    padding: 0 16px 16px;
  }

  .howto-step {
    padding: 18px;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
  }

  h1 { font-size: 1.6rem; }
  h2 { font-size: 1.35rem; }
  h3 { font-size: 1.15rem; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .fade-in {
    opacity: 1;
    transform: none;
  }
}