:root {
  --color-primary: #2b6cb0;
  --color-primary-light: #4299e1;
  --color-primary-dark: #1a365d;
  --color-primary-deep: #2c5282;
  --color-accent: #38b2ac;
  --color-accent-light: #4fd1c5;
  --color-text: #2d3748;
  --color-text-light: #4a5568;
  --color-text-muted: #718096;
  --color-text-faint: #a0aec0;
  --color-bg: #f7fafc;
  --color-bg-alt: #edf2f7;
  --color-surface: #ffffff;
  --color-surface-glass: rgba(255, 255, 255, 0.72);
  --color-border: #e2e8f0;
  --color-border-light: #edf2f7;
  --color-shadow: rgba(0, 0, 0, 0.06);
  --color-shadow-md: rgba(0, 0, 0, 0.08);
  --color-shadow-lg: rgba(43, 108, 176, 0.15);
  --gradient-banner: linear-gradient(135deg, #1a365d 0%, #2b6cb0 40%, #4299e1 70%, #38b2ac 100%);
  --gradient-card: linear-gradient(135deg, rgba(43, 108, 176, 0.04), rgba(56, 178, 172, 0.04));
  --gradient-btn: linear-gradient(135deg, #2b6cb0, #4299e1);
  --gradient-stat: linear-gradient(135deg, #ebf8ff, #e6fffa);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
  --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
  --max-width: 1180px;
}

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

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

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.8;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background var(--transition-base), color var(--transition-base);
  overflow-x: hidden;
}

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

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

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

ul,
ol {
  margin: 0 0 16px 24px;
}

li {
  margin-bottom: 8px;
}

p {
  margin-bottom: 14px;
  text-align: justify;
}

/* ========== Header ========== */
header {
  position: sticky;
  top: 0;
  background: var(--color-surface-glass);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  backdrop-filter: blur(16px) saturate(180%);
  box-shadow: 0 1px 3px var(--color-shadow), 0 4px 16px rgba(0, 0, 0, 0.04);
  z-index: 100;
  border-bottom: 1px solid rgba(226, 232, 240, 0.6);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

.nav-wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  flex-wrap: wrap;
  gap: 10px;
}

.logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.5px;
  white-space: nowrap;
  transition: transform var(--transition-fast), color var(--transition-fast);
}

.logo:hover {
  transform: scale(1.03);
  color: var(--color-primary-light);
}

nav ul {
  display: flex;
  list-style: none;
  gap: 18px;
  flex-wrap: wrap;
  margin: 0;
}

nav a {
  color: var(--color-text-light);
  font-size: 15px;
  position: relative;
  padding-bottom: 2px;
  transition: color var(--transition-fast);
}

nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: var(--gradient-btn);
  border-radius: 2px;
  transition: width var(--transition-base);
}

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

nav a:hover::after {
  width: 100%;
}

.search-box {
  display: flex;
  gap: 6px;
  align-items: center;
}

.search-box input {
  padding: 7px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  background: rgba(255, 255, 255, 0.8);
  color: var(--color-text);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
  width: 140px;
}

.search-box input:focus {
  border-color: var(--color-primary-light);
  box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.15);
  background: #fff;
}

.search-box button {
  padding: 7px 16px;
  background: var(--gradient-btn);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), filter var(--transition-fast);
  white-space: nowrap;
}

.search-box button:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px var(--color-shadow-lg);
  filter: brightness(1.05);
}

.search-box button:active {
  transform: translateY(0);
}

.dark-toggle {
  padding: 7px 12px;
  border: 1px solid var(--color-border);
  background: rgba(255, 255, 255, 0.8);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
  transition: background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
  flex-shrink: 0;
}

.dark-toggle:hover {
  background: var(--color-bg-alt);
  border-color: var(--color-primary-light);
  transform: rotate(15deg);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 6px 12px;
  font-size: 18px;
  cursor: pointer;
  color: var(--color-text);
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.mobile-menu-btn:hover {
  background: var(--color-bg-alt);
  border-color: var(--color-primary-light);
}

/* ========== Banner ========== */
.banner {
  background: var(--gradient-banner);
  background-size: 200% 200%;
  animation: gradientShift 12s ease infinite;
  color: #fff;
  padding: 72px 20px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.banner::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 40%, rgba(255, 255, 255, 0.08) 0%, transparent 60%),
              radial-gradient(circle at 70% 60%, rgba(56, 178, 172, 0.12) 0%, transparent 50%);
  animation: bannerFloat 18s ease-in-out infinite;
  pointer-events: none;
}

@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

@keyframes bannerFloat {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  33% { transform: translate(2%, -2%) rotate(2deg); }
  66% { transform: translate(-1%, 1%) rotate(-1deg); }
}

.banner h1 {
  font-size: 34px;
  margin-bottom: 18px;
  font-weight: 700;
  letter-spacing: 1px;
  position: relative;
  z-index: 1;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
  line-height: 1.4;
}

.banner p {
  font-size: 17px;
  max-width: 820px;
  margin: 0 auto 28px;
  position: relative;
  z-index: 1;
  opacity: 0.95;
  text-align: center;
  line-height: 1.9;
}

.banner .cta {
  display: inline-block;
  padding: 13px 34px;
  background: rgba(255, 255, 255, 0.95);
  color: var(--color-primary);
  border-radius: var(--radius-md);
  font-weight: 600;
  margin: 6px 8px;
  position: relative;
  z-index: 1;
  transition: transform var(--transition-base), box-shadow var(--transition-base), background var(--transition-base);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.banner .cta:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.2);
  background: #fff;
  text-decoration: none;
  color: var(--color-primary-dark);
}

.banner .cta:active {
  transform: translateY(-1px);
}

/* ========== Slides ========== */
.slides {
  max-width: var(--max-width);
  margin: 30px auto;
  padding: 0 20px;
}

.slide-item {
  background: var(--color-surface);
  border-left: 4px solid var(--color-primary-light);
  padding: 18px 24px;
  border-radius: var(--radius-md);
  box-shadow: 0 2px 8px var(--color-shadow);
  transition: transform var(--transition-base), box-shadow var(--transition-base), background var(--transition-base);
  font-size: 15px;
  color: var(--color-text-light);
  animation: slideFadeIn 0.5s ease;
}

.slide-item:hover {
  transform: translateX(6px);
  box-shadow: 0 6px 20px var(--color-shadow-md);
}

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

/* ========== Main ========== */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 20px;
}

/* ========== Breadcrumb ========== */
.breadcrumb {
  font-size: 14px;
  color: var(--color-text-muted);
  margin-bottom: 20px;
  padding: 8px 0;
}

.breadcrumb a {
  color: var(--color-primary);
  transition: color var(--transition-fast);
}

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

/* ========== Sections ========== */
section {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 36px;
  margin-bottom: 28px;
  box-shadow: 0 2px 12px var(--color-shadow), 0 0 0 1px rgba(226, 232, 240, 0.5);
  transition: background var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base), opacity var(--transition-slow);
  position: relative;
  overflow: hidden;
}

section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-btn);
  opacity: 0;
  transition: opacity var(--transition-base);
}

section:hover::before {
  opacity: 1;
}

section:hover {
  box-shadow: 0 6px 24px var(--color-shadow-md), 0 0 0 1px rgba(226, 232, 240, 0.6);
}

/* ========== Headings ========== */
h2 {
  font-size: 24px;
  color: var(--color-primary-dark);
  border-left: 5px solid var(--color-primary-light);
  padding-left: 16px;
  margin-bottom: 22px;
  line-height: 1.4;
  font-weight: 700;
  transition: color var(--transition-base), border-color var(--transition-base);
}

h3 {
  font-size: 19px;
  color: var(--color-primary-deep);
  margin: 24px 0 12px;
  font-weight: 600;
  transition: color var(--transition-base);
}

h4 {
  font-size: 17px;
  color: var(--color-primary);
  margin: 18px 0 10px;
  font-weight: 600;
  transition: color var(--transition-base);
}

/* ========== Grid ========== */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
  margin-top: 16px;
}

.card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 22px;
  background: var(--gradient-card), var(--color-surface);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  position: relative;
  overflow: hidden;
}

.card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(66, 153, 225, 0.03), rgba(56, 178, 172, 0.03));
  opacity: 0;
  transition: opacity var(--transition-base);
  pointer-events: none;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px var(--color-shadow-lg);
  border-color: var(--color-primary-light);
}

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

.card h4 {
  margin-top: 0;
}

/* ========== Stats ========== */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin: 20px 0;
}

.stat {
  text-align: center;
  padding: 22px 16px;
  background: var(--gradient-stat);
  border-radius: var(--radius-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  border: 1px solid rgba(66, 153, 225, 0.1);
}

.stat:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 6px 20px rgba(66, 153, 225, 0.15);
}

.stat .num {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
  background: var(--gradient-btn);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat .label {
  font-size: 14px;
  color: var(--color-text-light);
  margin-top: 8px;
}

/* ========== FAQ ========== */
.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding: 18px 0;
  transition: border-color var(--transition-base);
}

.faq-item:last-child {
  border-bottom: none;
}

.faq-item h4 {
  cursor: pointer;
  margin: 0;
  color: var(--color-primary-deep);
  padding: 4px 0;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
  position: relative;
}

.faq-item h4::before {
  content: "▸";
  display: inline-block;
  margin-right: 8px;
  color: var(--color-primary-light);
  transition: transform var(--transition-fast);
  font-size: 14px;
}

.faq-item h4:hover {
  color: var(--color-primary);
  padding-left: 4px;
}

.faq-item h4:hover::before {
  transform: translateX(3px);
}

.faq-item .answer {
  margin-top: 12px;
  color: var(--color-text-light);
  display: block;
  padding-left: 22px;
  line-height: 1.9;
  font-size: 15px;
}

/* ========== Article List ========== */
.article-list article {
  border-bottom: 1px dashed var(--color-border);
  padding: 20px 0;
  transition: padding-left var(--transition-base), background var(--transition-base);
  border-radius: var(--radius-sm);
}

.article-list article:hover {
  padding-left: 12px;
  background: rgba(66, 153, 225, 0.02);
}

.article-list article:last-child {
  border-bottom: none;
}

.article-list h4 {
  margin: 0 0 8px;
  transition: color var(--transition-fast);
}

.article-list article:hover h4 {
  color: var(--color-primary-light);
}

.meta {
  font-size: 13px;
  color: var(--color-text-faint);
  margin-bottom: 8px;
}

/* ========== Contact Info ========== */
.contact-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.contact-info div {
  background: var(--color-bg-alt);
  padding: 18px 20px;
  border-radius: var(--radius-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base), background var(--transition-base);
  border: 1px solid transparent;
}

.contact-info div:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 18px var(--color-shadow-md);
  border-color: rgba(66, 153, 225, 0.15);
}

.contact-info strong {
  color: var(--color-primary);
  display: block;
  margin-bottom: 6px;
  font-size: 14px;
  letter-spacing: 0.3px;
}

/* ========== Table ========== */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 1px 4px var(--color-shadow);
}

th,
td {
  border: 1px solid var(--color-border);
  padding: 12px 14px;
  text-align: left;
  font-size: 15px;
  transition: background var(--transition-fast);
}

th {
  background: var(--gradient-stat);
  color: var(--color-primary-deep);
  font-weight: 600;
}

tr:hover td {
  background: rgba(66, 153, 225, 0.04);
}

/* ========== Footer ========== */
footer {
  background: linear-gradient(180deg, #1a365d 0%, #15294a 100%);
  color: #cbd5e0;
  padding: 48px 20px 24px;
  margin-top: 48px;
  position: relative;
  overflow: hidden;
}

footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-primary-light), var(--color-accent), transparent);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 28px;
}

footer h4 {
  color: #fff;
  font-size: 16px;
  margin-bottom: 14px;
  font-weight: 600;
  letter-spacing: 0.5px;
  position: relative;
  padding-bottom: 8px;
}

footer h4::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 28px;
  height: 2px;
  background: var(--color-primary-light);
  border-radius: 2px;
}

footer a {
  color: #a0aec0;
  font-size: 14px;
  display: block;
  margin-bottom: 8px;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
  position: relative;
}

footer a:hover {
  color: #fff;
  padding-left: 6px;
  text-decoration: none;
}

footer a::before {
  content: "›";
  position: absolute;
  left: -12px;
  opacity: 0;
  transition: opacity var(--transition-fast), left var(--transition-fast);
  color: var(--color-primary-light);
}

footer a:hover::before {
  opacity: 1;
  left: -6px;
}

.copyright {
  max-width: var(--max-width);
  margin: 28px auto 0;
  padding-top: 20px;
  border-top: 1px solid rgba(44, 82, 130, 0.5);
  text-align: center;
  font-size: 13px;
  color: #718096;
  line-height: 1.8;
}

/* ========== Back Top ========== */
.back-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient-btn);
  color: #fff;
  border: none;
  font-size: 20px;
  cursor: pointer;
  display: none;
  box-shadow: 0 4px 16px rgba(43, 108, 176, 0.4);
  z-index: 200;
  transition: transform var(--transition-base), box-shadow var(--transition-base), opacity var(--transition-base);
  align-items: center;
  justify-content: center;
  line-height: 1;
}

.back-top:hover {
  transform: translateY(-4px) scale(1.08);
  box-shadow: 0 8px 28px rgba(43, 108, 176, 0.55);
}

.back-top:active {
  transform: translateY(-2px) scale(1.02);
}

/* ========== Dark Mode ========== */
body.dark {
  --color-text: #e2e8f0;
  --color-text-light: #cbd5e0;
  --color-text-muted: #a0aec0;
  --color-text-faint: #718096;
  --color-bg: #1a202c;
  --color-bg-alt: #2d3748;
  --color-surface: #2d3748;
  --color-surface-glass: rgba(45, 55, 72, 0.78);
  --color-border: #4a5568;
  --color-border-light: #2d3748;
  --color-shadow: rgba(0, 0, 0, 0.25);
  --color-shadow-md: rgba(0, 0, 0, 0.35);
  --color-shadow-lg: rgba(66, 153, 225, 0.2);
  --gradient-card: linear-gradient(135deg, rgba(66, 153, 225, 0.06), rgba(56, 178, 172, 0.06));
  --gradient-stat: linear-gradient(135deg, #1a202c, #1a2a3a);
  background: var(--color-bg);
  color: var(--color-text);
}

body.dark header {
  background: var(--color-surface-glass);
  border-bottom-color: rgba(74, 85, 104, 0.5);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3), 0 4px 16px rgba(0, 0, 0, 0.2);
}

body.dark .logo {
  color: #90cdf4;
}

body.dark nav a {
  color: #a0aec0;
}

body.dark nav a:hover {
  color: #90cdf4;
}

body.dark .search-box input {
  background: rgba(26, 32, 44, 0.8);
  border-color: #4a5568;
  color: #e2e8f0;
}

body.dark .search-box input:focus {
  background: #1a202c;
  border-color: #4299e1;
}

body.dark .dark-toggle {
  background: rgba(26, 32, 44, 0.8);
  border-color: #4a5568;
  color: #e2e8f0;
}

body.dark .dark-toggle:hover {
  background: #1a202c;
}

body.dark .mobile-menu-btn {
  color: #e2e8f0;
  border-color: #4a5568;
}

body.dark .mobile-menu-btn:hover {
  background: #1a202c;
}

body.dark section {
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.25), 0 0 0 1px rgba(74, 85, 104, 0.4);
}

body.dark section:hover {
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.35), 0 0 0 1px rgba(74, 85, 104, 0.5);
}

body.dark h2 {
  color: #90cdf4;
  border-left-color: #4299e1;
}

body.dark h3,
body.dark h4 {
  color: #90cdf4;
}

body.dark .slide-item {
  background: var(--color-surface);
  border-left-color: #4299e1;
  color: #cbd5e0;
}

body.dark .card {
  background: var(--gradient-card), #1a202c;
  border-color: #4a5568;
}

body.dark .card:hover {
  border-color: #4299e1;
}

body.dark .stat {
  background: var(--gradient-stat);
  border-color: rgba(66, 153, 225, 0.15);
}

body.dark .contact-info div {
  background: #1a202c;
  color: #e2e8f0;
}

body.dark .contact-info div:hover {
  border-color: rgba(66, 153, 225, 0.3);
}

body.dark th {
  background: #1a202c;
  color: #90cdf4;
  border-color: #4a5568;
}

body.dark td {
  border-color: #4a5568;
  color: #cbd5e0;
}

body.dark tr:hover td {
  background: rgba(66, 153, 225, 0.06);
}

body.dark .faq-item {
  border-bottom-color: #4a5568;
}

body.dark .faq-item h4 {
  color: #90cdf4;
}

body.dark .faq-item .answer {
  color: #a0aec0;
}

body.dark .article-list article {
  border-bottom-color: #4a5568;
}

body.dark .article-list article:hover {
  background: rgba(66, 153, 225, 0.04);
}

body.dark footer {
  background: linear-gradient(180deg, #0d1520 0%, #0a1018 100%);
}

body.dark .breadcrumb {
  color: #a0aec0;
}

/* ========== Responsive ========== */
@media (max-width: 1024px) {
  .banner h1 {
    font-size: 28px;
  }

  section {
    padding: 28px;
  }
}

@media (max-width: 768px) {
  .nav-wrap {
    padding: 10px 16px;
    gap: 8px;
  }

  nav ul {
    display: none;
    flex-direction: column;
    width: 100%;
    gap: 6px;
    margin-top: 10px;
    padding: 10px 0;
    border-top: 1px solid var(--color-border);
  }

  nav ul.open {
    display: flex;
    animation: slideDown 0.3s ease;
  }

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

  nav a {
    padding: 8px 4px;
    display: block;
    border-radius: var(--radius-sm);
  }

  nav a:hover {
    background: rgba(66, 153, 225, 0.06);
    padding-left: 10px;
  }

  .mobile-menu-btn {
    display: block;
    order: 2;
  }

  .logo {
    order: 1;
    font-size: 17px;
  }

  .search-box {
    order: 3;
    width: 100%;
  }

  .search-box input {
    flex: 1;
    width: auto;
  }

  .dark-toggle {
    order: 4;
    margin-left: auto;
  }

  .banner {
    padding: 48px 16px;
  }

  .banner h1 {
    font-size: 22px;
    letter-spacing: 0.5px;
  }

  .banner p {
    font-size: 15px;
  }

  .banner .cta {
    padding: 11px 24px;
    font-size: 14px;
    margin: 4px;
  }

  h2 {
    font-size: 20px;
    padding-left: 12px;
    border-left-width: 4px;
  }

  h3 {
    font-size: 17px;
  }

  h4 {
    font-size: 15px;
  }

  section {
    padding: 20px 16px;
    border-radius: var(--radius-md);
    margin-bottom: 18px;
  }

  main {
    padding: 12px;
  }

  .slides {
    padding: 0 12px;
    margin: 20px auto;
  }

  .slide-item {
    padding: 14px 16px;
    font-size: 14px;
  }

  .grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

  .stat {
    padding: 16px 12px;
  }

  .stat .num {
    font-size: 24px;
  }

  .contact-info {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .footer-inner {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  footer {
    padding: 36px 16px 18px;
    margin-top: 32px;
  }

  .back-top {
    right: 16px;
    bottom: 16px;
    width: 42px;
    height: 42px;
    font-size: 18px;
  }

  table {
    font-size: 13px;
  }

  th,
  td {
    padding: 8px 10px;
  }

  .faq-item .answer {
    padding-left: 16px;
    font-size: 14px;
  }

  .article-list article {
    padding: 14px 0;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 15px;
  }

  .banner h1 {
    font-size: 19px;
  }

  .banner p {
    font-size: 14px;
  }

  .banner .cta {
    display: block;
    margin: 8px auto;
    max-width: 240px;
  }

  h2 {
    font-size: 18px;
  }

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

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .search-box input {
    font-size: 13px;
    padding: 6px 8px;
  }

  .search-box button {
    padding: 6px 12px;
    font-size: 13px;
  }
}

/* ========== Reduced Motion ========== */
@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;
  }
}

/* ========== Print ========== */
@media print {
  header,
  .back-top,
  .dark-toggle,
  .mobile-menu-btn,
  .search-box,
  .banner .cta {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
    font-size: 12pt;
  }

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

  .banner {
    background: #f0f0f0 !important;
    color: #000 !important;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }
}

/* ========== Selection ========== */
::selection {
  background: rgba(66, 153, 225, 0.25);
  color: var(--color-primary-dark);
}

body.dark ::selection {
  background: rgba(66, 153, 225, 0.35);
  color: #e2e8f0;
}

/* ========== Scrollbar ========== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, #4299e1, #2b6cb0);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, #2b6cb0, #1a365d);
}

body.dark ::-webkit-scrollbar-track {
  background: #1a202c;
}

body.dark ::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, #2b6cb0, #1a365d);
}

/* ========== Focus Visible ========== */
:focus-visible {
  outline: 2px solid var(--color-primary-light);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ========== Smooth Section Entrance ========== */
section {
  will-change: opacity, transform;
}

/* ========== Link Hover Underline Animation ========== */
.article-list a,
.faq-item a,
section > p a {
  position: relative;
  text-decoration: none;
  background-image: linear-gradient(var(--color-primary-light), var(--color-primary-light));
  background-size: 0% 1px;
  background-repeat: no-repeat;
  background-position: left bottom;
  transition: background-size var(--transition-base), color var(--transition-fast);
}

.article-list a:hover,
.faq-item a:hover,
section > p a:hover {
  background-size: 100% 1px;
  text-decoration: none;
  color: var(--color-primary-light);
}