:root {
  --brand-primary: #1A73E8;
  --brand-primary-dark: #0D47A1;
  --brand-secondary: #00BCD4;
  --brand-accent: #FF6D00;
  --brand-bg: #F8FAFC;
  --brand-surface: #FFFFFF;
  --brand-text: #1E293B;
  --brand-text-secondary: #475569;
  --brand-border: #E2E8F0;
  --brand-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --brand-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --brand-radius: 16px;
  --brand-radius-sm: 10px;
  --glass-bg: rgba(255, 255, 255, 0.72);
  --glass-border: rgba(255, 255, 255, 0.35);
  --glass-blur: saturate(180%) blur(14px);
  --gradient-brand: linear-gradient(135deg, #1A73E8 0%, #0D47A1 55%, #00BCD4 100%);
  --gradient-soft: linear-gradient(135deg, rgba(26, 115, 232, 0.08) 0%, rgba(0, 188, 212, 0.08) 100%);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", monospace;
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --brand-bg: #0B1220;
  --brand-surface: #131C2E;
  --brand-text: #F1F5F9;
  --brand-text-secondary: #94A3B8;
  --brand-border: #2A3650;
  --brand-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --brand-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
  --glass-bg: rgba(19, 28, 46, 0.72);
  --glass-border: rgba(148, 163, 184, 0.18);
  --gradient-soft: linear-gradient(135deg, rgba(26, 115, 232, 0.14) 0%, rgba(0, 188, 212, 0.12) 100%);
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--brand-bg);
  color: var(--brand-text);
  line-height: 1.7;
  font-size: 16px;
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a:hover {
  color: var(--brand-primary-dark);
}

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

::selection {
  background: rgba(26, 115, 232, 0.22);
  color: var(--brand-text);
}

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

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

::-webkit-scrollbar-thumb {
  background: var(--brand-border);
  border-radius: 10px;
  border: 2px solid var(--brand-bg);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--brand-primary);
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--brand-shadow);
  transition: var(--transition);
}

.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.4rem;
  color: var(--brand-primary);
  letter-spacing: -0.5px;
}

.logo:hover {
  color: var(--brand-primary-dark);
  transform: translateY(-1px);
}

.logo svg {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(26, 115, 232, 0.32);
  transition: var(--transition);
}

.logo:hover svg {
  transform: rotate(-6deg) scale(1.06);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--brand-text-secondary);
  padding: 6px 0;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--gradient-brand);
  transition: var(--transition);
}

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

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

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

.search-box {
  display: flex;
  align-items: center;
  background: var(--brand-bg);
  border: 1px solid var(--brand-border);
  border-radius: 40px;
  padding: 4px 4px 4px 16px;
  transition: var(--transition);
}

.search-box:focus-within {
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.15);
  background: var(--brand-surface);
}

.search-box input {
  border: none;
  background: transparent;
  outline: none;
  font-size: 0.9rem;
  color: var(--brand-text);
  width: 140px;
  padding: 6px 0;
  font-family: var(--font-sans);
}

.search-box input::placeholder {
  color: var(--brand-text-secondary);
  opacity: 0.7;
}

.search-box button {
  background: var(--gradient-brand);
  border: none;
  border-radius: 40px;
  padding: 6px 14px;
  cursor: pointer;
  color: #fff;
  font-size: 0.85rem;
  font-weight: 600;
  transition: var(--transition);
  font-family: var(--font-sans);
}

.search-box button:hover {
  filter: brightness(1.08);
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(26, 115, 232, 0.35);
}

.theme-toggle {
  background: none;
  border: 1px solid var(--brand-border);
  border-radius: 50%;
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--brand-text-secondary);
  transition: var(--transition);
}

.theme-toggle:hover {
  border-color: var(--brand-primary);
  color: var(--brand-primary);
  transform: rotate(18deg);
  box-shadow: 0 0 0 4px rgba(26, 115, 232, 0.1);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: 1px solid var(--brand-border);
  border-radius: 8px;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--brand-text);
  transition: var(--transition);
}

.mobile-menu-btn:hover {
  border-color: var(--brand-primary);
  color: var(--brand-primary);
}

.breadcrumb {
  padding: 12px 0;
  font-size: 0.85rem;
  color: var(--brand-text-secondary);
  background: var(--brand-bg);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  gap: 6px;
}

.breadcrumb li + li::before {
  content: '/';
  margin-right: 6px;
  color: var(--brand-border);
}

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

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

.banner-section {
  position: relative;
  background: var(--gradient-brand);
  color: #fff;
  overflow: hidden;
  min-height: 440px;
}

.banner-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 18% 22%, rgba(255, 255, 255, 0.16) 0%, transparent 42%),
    radial-gradient(circle at 82% 78%, rgba(0, 188, 212, 0.28) 0%, transparent 48%);
  pointer-events: none;
  z-index: 1;
}

.banner-slides {
  display: flex;
  transition: transform 0.55s cubic-bezier(0.4, 0, 0.2, 1);
}

.banner-slide {
  min-width: 100%;
  padding: 76px 0;
  display: flex;
  align-items: center;
  position: relative;
}

.banner-content {
  max-width: 620px;
  position: relative;
  z-index: 2;
}

.banner-content h1 {
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 18px;
  letter-spacing: -0.5px;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.18);
}

.banner-content p {
  font-size: 1.15rem;
  opacity: 0.94;
  margin-bottom: 28px;
  line-height: 1.8;
}

.banner-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border-radius: 40px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  font-family: var(--font-sans);
  gap: 8px;
  position: relative;
  overflow: hidden;
}

.btn svg {
  transition: transform 0.25s ease;
}

.btn:hover svg {
  transform: translateX(4px);
}

.btn-primary {
  background: #fff;
  color: var(--brand-primary-dark);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12);
}

.btn-primary:hover {
  background: #f0f7ff;
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.2);
  color: var(--brand-primary-dark);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  border: 2px solid rgba(255, 255, 255, 0.6);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}

.btn-outline:hover {
  border-color: #fff;
  background: rgba(255, 255, 255, 0.18);
  transform: translateY(-2px);
  color: #fff;
}

.banner-bg-svg {
  position: absolute;
  right: -60px;
  top: 50%;
  transform: translateY(-50%);
  width: 480px;
  height: 480px;
  opacity: 0.14;
  pointer-events: none;
  animation: floatSlow 9s ease-in-out infinite;
}

@keyframes floatSlow {
  0%, 100% { transform: translateY(-50%) rotate(0deg); }
  50% { transform: translateY(-46%) rotate(6deg); }
}

.banner-dots {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 5;
}

.banner-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.4);
  border: none;
  cursor: pointer;
  transition: var(--transition);
  padding: 0;
}

.banner-dot:hover {
  background: rgba(255, 255, 255, 0.7);
}

.banner-dot.active {
  background: #fff;
  width: 28px;
  border-radius: 10px;
  box-shadow: 0 0 12px rgba(255, 255, 255, 0.6);
}

.stats-section {
  background: var(--brand-surface);
  padding: 48px 0;
  border-bottom: 1px solid var(--brand-border);
  position: relative;
  z-index: 2;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stat-item {
  padding: 20px 12px;
  border-radius: var(--brand-radius);
  transition: var(--transition);
}

.stat-item:hover {
  background: var(--gradient-soft);
  transform: translateY(-3px);
}

.stat-number {
  font-size: 2.4rem;
  font-weight: 800;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  line-height: 1.2;
  letter-spacing: -1px;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--brand-text-secondary);
  margin-top: 6px;
}

.section {
  padding: 72px 0;
}

.section-alt {
  background: var(--brand-surface);
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 48px;
}

.section-header h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 14px;
  letter-spacing: -0.5px;
  color: var(--brand-text);
  position: relative;
  display: inline-block;
}

.section-header h2::after {
  content: '';
  display: block;
  width: 56px;
  height: 4px;
  border-radius: 4px;
  background: var(--gradient-brand);
  margin: 14px auto 0;
}

.section-header p {
  color: var(--brand-text-secondary);
  font-size: 1.05rem;
  line-height: 1.8;
}

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

.card {
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--brand-border);
  border-radius: var(--brand-radius);
  padding: 32px 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-brand);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s ease;
}

.card:hover::before {
  transform: scaleX(1);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--brand-shadow-lg);
  border-color: rgba(26, 115, 232, 0.4);
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: var(--gradient-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--brand-primary);
  transition: var(--transition);
}

.card:hover .card-icon {
  transform: scale(1.08) rotate(-4deg);
  box-shadow: 0 8px 20px rgba(26, 115, 232, 0.22);
}

.card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--brand-text);
}

.card p {
  color: var(--brand-text-secondary);
  font-size: 0.95rem;
  line-height: 1.75;
}

.article-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.article-card {
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--brand-border);
  border-radius: var(--brand-radius);
  padding: 28px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.article-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--brand-shadow-lg);
  border-color: rgba(26, 115, 232, 0.4);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.82rem;
  color: var(--brand-text-secondary);
  margin-bottom: 12px;
}

.article-tag {
  background: var(--gradient-soft);
  color: var(--brand-primary);
  padding: 3px 10px;
  border-radius: 20px;
  font-weight: 600;
  font-size: 0.78rem;
  border: 1px solid rgba(26, 115, 232, 0.16);
}

.article-card h3 {
  font-size: 1.08rem;
  font-weight: 700;
  margin-bottom: 10px;
  line-height: 1.5;
  color: var(--brand-text);
  transition: var(--transition);
}

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

.article-card p {
  color: var(--brand-text-secondary);
  font-size: 0.92rem;
  line-height: 1.7;
  flex: 1;
}

.article-link {
  margin-top: 16px;
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--brand-primary);
}

.article-link:hover {
  gap: 10px;
}

.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--brand-border);
  border-radius: var(--brand-radius-sm);
  overflow: hidden;
  transition: var(--transition);
}

.faq-item:hover {
  border-color: rgba(26, 115, 232, 0.45);
  box-shadow: var(--brand-shadow);
}

.faq-item.open {
  border-color: var(--brand-primary);
  box-shadow: 0 8px 24px rgba(26, 115, 232, 0.12);
}

.faq-question {
  width: 100%;
  background: none;
  border: none;
  padding: 20px 24px;
  text-align: left;
  font-size: 1rem;
  font-weight: 600;
  color: var(--brand-text);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-family: var(--font-sans);
  transition: var(--transition);
}

.faq-question:hover {
  color: var(--brand-primary);
}

.faq-question svg {
  flex-shrink: 0;
  transition: transform 0.3s ease;
  color: var(--brand-text-secondary);
}

.faq-item.open .faq-question svg {
  transform: rotate(180deg);
  color: var(--brand-primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 24px;
}

.faq-item.open .faq-answer {
  max-height: 420px;
  padding: 0 24px 22px;
}

.faq-answer p {
  color: var(--brand-text-secondary);
  font-size: 0.95rem;
  line-height: 1.8;
}

.howto-steps {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.howto-step {
  display: flex;
  gap: 20px;
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--brand-border);
  border-radius: var(--brand-radius);
  padding: 24px;
  transition: var(--transition);
  position: relative;
}

.howto-step:hover {
  border-color: rgba(26, 115, 232, 0.45);
  box-shadow: var(--brand-shadow);
  transform: translateX(4px);
}

.step-number {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--gradient-brand);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  flex-shrink: 0;
  box-shadow: 0 6px 16px rgba(26, 115, 232, 0.32);
  transition: var(--transition);
}

.howto-step:hover .step-number {
  transform: scale(1.1);
}

.step-content h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--brand-text);
}

.step-content p {
  color: var(--brand-text-secondary);
  font-size: 0.93rem;
  line-height: 1.7;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.contact-item {
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--brand-border);
  border-radius: var(--brand-radius);
  padding: 28px;
  text-align: center;
  transition: var(--transition);
}

.contact-item:hover {
  border-color: rgba(26, 115, 232, 0.45);
  box-shadow: var(--brand-shadow);
  transform: translateY(-4px);
}

.contact-item svg {
  margin: 0 auto 14px;
  color: var(--brand-primary);
  transition: var(--transition);
}

.contact-item:hover svg {
  transform: scale(1.12);
}

.contact-item h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.contact-item p {
  color: var(--brand-text-secondary);
  font-size: 0.92rem;
  line-height: 1.7;
}

.site-footer {
  background: var(--brand-surface);
  border-top: 1px solid var(--brand-border);
  padding: 56px 0 28px;
  color: var(--brand-text-secondary);
  font-size: 0.9rem;
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-brand);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand p {
  margin-top: 12px;
  line-height: 1.8;
  font-size: 0.9rem;
}

.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--brand-text);
  margin-bottom: 16px;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col a {
  color: var(--brand-text-secondary);
  font-size: 0.88rem;
  display: inline-block;
  transition: var(--transition);
}

.footer-col a:hover {
  color: var(--brand-primary);
  transform: translateX(4px);
}

.footer-bottom {
  border-top: 1px solid var(--brand-border);
  padding-top: 24px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-size: 0.85rem;
}

.footer-bottom-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-bottom-links a {
  color: var(--brand-text-secondary);
}

.footer-bottom-links a:hover {
  color: var(--brand-primary);
}

.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient-brand);
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 24px rgba(26, 115, 232, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: var(--transition);
  z-index: 999;
}

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

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 32px rgba(26, 115, 232, 0.5);
  filter: brightness(1.08);
}

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

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.lazy-img {
  background: linear-gradient(90deg, var(--brand-border) 25%, var(--brand-bg) 50%, var(--brand-border) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

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

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

@media (max-width: 992px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .banner-content h1 {
    font-size: 2.2rem;
  }
  .banner-bg-svg {
    width: 380px;
    height: 380px;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--glass-bg);
    -webkit-backdrop-filter: var(--glass-blur);
    backdrop-filter: var(--glass-blur);
    flex-direction: column;
    padding: 20px;
    gap: 16px;
    border-bottom: 1px solid var(--brand-border);
    box-shadow: var(--brand-shadow-lg);
    align-items: flex-start;
  }
  .nav-links.open {
    display: flex;
    animation: slideDown 0.28s ease;
  }
  @keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
  }
  .mobile-menu-btn {
    display: flex;
  }
  .search-box input {
    width: 100px;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .banner-content h1 {
    font-size: 1.8rem;
  }
  .banner-content p {
    font-size: 1rem;
  }
  .section {
    padding: 48px 0;
  }
  .section-header h2 {
    font-size: 1.6rem;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .banner-bg-svg {
    width: 300px;
    height: 300px;
    right: -80px;
  }
  .howto-step {
    flex-direction: column;
    gap: 14px;
  }
}

@media (max-width: 480px) {
  .banner-content h1 {
    font-size: 1.5rem;
  }
  .banner-actions {
    flex-direction: column;
  }
  .btn {
    width: 100%;
    justify-content: center;
  }
  .search-box {
    display: none;
  }
  .stat-number {
    font-size: 1.8rem;
  }
  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
  }
  .card {
    padding: 24px 20px;
  }
  .article-card {
    padding: 22px;
  }
  .faq-question {
    padding: 16px 18px;
    font-size: 0.95rem;
  }
  .faq-answer {
    padding: 0 18px;
  }
  .faq-item.open .faq-answer {
    padding: 0 18px 18px;
  }
}