:root {
  --primary: #38bdf8;
  --primary-dark: #0ea5e9;
  --primary-light: #7dd3fc;
  --accent: #a78bfa;
  --accent-dark: #8b5cf6;
  --bg: #f8fafc;
  --bg-alt: #eef2f7;
  --surface: #ffffff;
  --surface-glass: rgba(255, 255, 255, 0.72);
  --surface-glass-border: rgba(255, 255, 255, 0.45);
  --text: #1f2937;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --border: #e2e8f0;
  --header-bg: #0f172a;
  --footer-bg: #0f172a;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.08), 0 2px 6px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.12), 0 4px 12px rgba(15, 23, 42, 0.06);
  --shadow-glow: 0 0 24px rgba(56, 189, 248, 0.28);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-pill: 999px;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.32s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  --gradient-hero: linear-gradient(135deg, #0f172a 0%, #1e3a8a 45%, #0ea5e9 100%);
  --gradient-accent: linear-gradient(135deg, #38bdf8 0%, #a78bfa 100%);
  --gradient-card: linear-gradient(160deg, rgba(56, 189, 248, 0.06) 0%, rgba(167, 139, 250, 0.06) 100%);
}

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

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

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background-color var(--transition-base), color var(--transition-base);
}

a {
  color: #0369a1;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

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

button {
  font-family: inherit;
}

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 20px;
}

.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;
}

/* ============ Header ============ */
header.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 23, 42, 0.82);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  color: #e2e8f0;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
  border-bottom: 1px solid rgba(56, 189, 248, 0.12);
  transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 20px;
  max-width: 1180px;
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 20px;
  color: #fff;
  letter-spacing: 0.5px;
  transition: transform var(--transition-fast);
}

.logo:hover {
  text-decoration: none;
  transform: scale(1.03);
}

.logo-mark {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.logo:hover .logo-mark {
  transform: rotate(-6deg) scale(1.08);
  box-shadow: 0 0 18px rgba(56, 189, 248, 0.45);
}

nav.main-nav ul {
  display: flex;
  gap: 22px;
  list-style: none;
  flex-wrap: wrap;
}

nav.main-nav a {
  color: #cbd5e1;
  font-size: 15px;
  position: relative;
  padding: 4px 0;
  transition: color var(--transition-fast);
}

nav.main-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0;
  height: 2px;
  background: var(--gradient-accent);
  border-radius: 2px;
  transition: right var(--transition-base);
}

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

nav.main-nav a:hover::after {
  right: 0;
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 10px;
}

.search-box {
  display: flex;
  align-items: center;
  background: rgba(30, 41, 59, 0.72);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(56, 189, 248, 0.18);
  border-radius: var(--radius-pill);
  padding: 4px 10px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-box:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.18);
}

.search-box input {
  background: transparent;
  border: none;
  outline: none;
  color: #e2e8f0;
  width: 130px;
  font-size: 14px;
  font-family: inherit;
}

.search-box input::placeholder {
  color: #64748b;
}

.search-box button {
  background: var(--gradient-accent);
  border: none;
  color: #0f172a;
  border-radius: 14px;
  padding: 4px 12px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), filter var(--transition-fast);
}

.search-box button:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow);
  filter: brightness(1.06);
}

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

.theme-toggle {
  background: rgba(30, 41, 59, 0.72);
  border: 1px solid rgba(56, 189, 248, 0.18);
  color: #e2e8f0;
  border-radius: 50%;
  width: 36px;
  height: 36px;
  cursor: pointer;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-fast), background-color var(--transition-fast), box-shadow var(--transition-fast);
}

.theme-toggle:hover {
  transform: rotate(18deg) scale(1.08);
  background: rgba(56, 189, 248, 0.16);
  box-shadow: var(--shadow-glow);
}

.mobile-menu-btn {
  display: none;
  background: rgba(30, 41, 59, 0.72);
  border: 1px solid rgba(56, 189, 248, 0.18);
  color: #e2e8f0;
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  cursor: pointer;
  font-size: 18px;
  transition: background-color var(--transition-fast);
}

.mobile-menu-btn:hover {
  background: rgba(56, 189, 248, 0.16);
}

/* ============ Breadcrumb ============ */
.breadcrumb {
  background: var(--bg-alt);
  font-size: 13px;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
  transition: background-color var(--transition-base), color var(--transition-base);
}

.breadcrumb ol {
  display: flex;
  gap: 8px;
  list-style: none;
  padding: 10px 20px;
  max-width: 1180px;
  margin: 0 auto;
  flex-wrap: wrap;
}

.breadcrumb li + li::before {
  content: "›";
  margin-right: 8px;
  color: var(--text-light);
}

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

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

/* ============ Hero ============ */
.hero {
  position: relative;
  background: var(--gradient-hero);
  color: #fff;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 18% 28%, rgba(56, 189, 248, 0.22) 0%, transparent 42%),
    radial-gradient(circle at 82% 72%, rgba(167, 139, 250, 0.2) 0%, transparent 46%);
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse at center, #000 30%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse at center, #000 30%, transparent 78%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 1180px;
  margin: 0 auto;
  padding: 56px 20px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
}

.hero h1 {
  font-size: 32px;
  line-height: 1.4;
  margin-bottom: 16px;
  letter-spacing: 0.3px;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.25);
}

.hero .lead {
  font-size: 16px;
  color: #cbd5e1;
  margin-bottom: 22px;
  max-width: 560px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 11px 22px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  border: none;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-fast), box-shadow var(--transition-base), background-color var(--transition-fast), border-color var(--transition-fast);
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: var(--gradient-accent);
  color: #0f172a;
  box-shadow: 0 4px 18px rgba(56, 189, 248, 0.35);
}

.btn-primary:hover {
  color: #0f172a;
  box-shadow: 0 8px 28px rgba(56, 189, 248, 0.5);
  filter: brightness(1.05);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.06);
  color: #e2e8f0;
  border: 1px solid rgba(148, 163, 184, 0.5);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.btn-ghost:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--primary);
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.25);
}

/* ============ Carousel ============ */
.carousel {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: rgba(30, 41, 59, 0.55);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border: 1px solid rgba(255, 255, 255, 0.12);
  min-height: 230px;
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.08);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.carousel:hover {
  transform: translateY(-4px);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.38), 0 0 32px rgba(56, 189, 248, 0.15), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.carousel-slide {
  display: none;
  padding: 26px;
  animation: fadeSlideIn 0.5s ease;
}

.carousel-slide.active {
  display: block;
}

@keyframes fadeSlideIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.carousel-slide h3 {
  font-size: 19px;
  margin-bottom: 10px;
  color: var(--primary);
  letter-spacing: 0.3px;
}

.carousel-slide p {
  font-size: 14px;
  color: #cbd5e1;
  margin-bottom: 0;
}

.carousel-dots {
  display: flex;
  gap: 8px;
  justify-content: center;
  padding: 12px;
}

.carousel-dots button {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: none;
  background: #475569;
  cursor: pointer;
  padding: 0;
  transition: background-color var(--transition-fast), transform var(--transition-fast), width var(--transition-base);
}

.carousel-dots button:hover {
  background: var(--primary-light);
  transform: scale(1.2);
}

.carousel-dots button.active {
  background: var(--gradient-accent);
  width: 26px;
  border-radius: var(--radius-pill);
}

/* ============ Stats ============ */
.stats {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  transition: background-color var(--transition-base), border-color var(--transition-base);
}

.stats-grid {
  max-width: 1180px;
  margin: 0 auto;
  padding: 30px 20px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  text-align: center;
}

.stats-grid > div {
  padding: 10px 6px;
  border-radius: var(--radius-md);
  transition: transform var(--transition-base), background-color var(--transition-base);
}

.stats-grid > div:hover {
  transform: translateY(-4px);
  background: var(--gradient-card);
}

.stat-num {
  font-size: 30px;
  font-weight: 700;
  color: var(--header-bg);
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  transition: color var(--transition-base);
}

.stat-label {
  font-size: 14px;
  color: var(--text-muted);
}

/* ============ Main & Sections ============ */
main {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 20px;
}

section.block {
  padding: 44px 0;
  border-bottom: 1px solid var(--border);
  transition: border-color var(--transition-base);
}

section.block:last-of-type {
  border-bottom: none;
}

h2.section-title {
  font-size: 24px;
  color: var(--header-bg);
  margin-bottom: 8px;
  position: relative;
  padding-left: 14px;
  letter-spacing: 0.3px;
  transition: color var(--transition-base);
}

h2.section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 5px;
  border-radius: 3px;
  background: var(--gradient-accent);
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.5);
  transition: box-shadow var(--transition-base);
}

.section-sub {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 24px;
}

h3 {
  font-size: 19px;
  color: var(--header-bg);
  margin: 20px 0 10px;
  letter-spacing: 0.2px;
  transition: color var(--transition-base);
}

h4 {
  font-size: 16px;
  color: #334155;
  margin: 16px 0 8px;
  transition: color var(--transition-base);
}

p {
  margin-bottom: 14px;
  color: var(--text-secondary);
  transition: color var(--transition-base);
}

ul.plain,
ol.plain {
  padding-left: 22px;
  margin-bottom: 16px;
  color: var(--text-secondary);
}

ul.plain li,
ol.plain li {
  margin-bottom: 8px;
  transition: color var(--transition-base), transform var(--transition-fast);
}

ul.plain li:hover,
ol.plain li:hover {
  transform: translateX(3px);
}

ul.plain li::marker,
ol.plain li::marker {
  color: var(--primary);
}

/* ============ Grids ============ */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

/* ============ Cards ============ */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base), background-color var(--transition-base);
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(56, 189, 248, 0.45);
}

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

.card h3 {
  margin-top: 0;
  font-size: 17px;
}

.card p {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 0;
}

/* ============ Case Cards ============ */
.case-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base), background-color var(--transition-base);
}

.case-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(167, 139, 250, 0.45);
}

.case-card .case-body {
  padding: 18px;
}

.case-card h3 {
  font-size: 17px;
  margin-top: 0;
  transition: color var(--transition-fast);
}

.case-card:hover h3 {
  color: var(--primary-dark);
}

.case-meta {
  font-size: 12px;
  color: var(--text-light);
  margin-bottom: 8px;
  letter-spacing: 0.3px;
}

/* ============ Quote ============ */
blockquote.quote {
  background: var(--bg-alt);
  border-left: 4px solid var(--primary);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-secondary);
  margin-bottom: 16px;
  position: relative;
  transition: background-color var(--transition-base), border-color var(--transition-base), transform var(--transition-fast), box-shadow var(--transition-fast);
}

blockquote.quote:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
  border-left-color: var(--accent);
}

blockquote.quote::before {
  content: "\201C";
  position: absolute;
  top: 2px;
  left: 8px;
  font-size: 42px;
  line-height: 1;
  color: rgba(56, 189, 248, 0.22);
  font-family: Georgia, serif;
  pointer-events: none;
}

/* ============ Article List ============ */
.article-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
}

.article-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 18px;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base), background-color var(--transition-base);
}

.article-item::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--gradient-card);
  opacity: 0;
  transition: opacity var(--transition-base);
  pointer-events: none;
}

.article-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(56, 189, 248, 0.4);
}

.article-item:hover::after {
  opacity: 1;
}

.article-item h3 {
  font-size: 17px;
  margin-top: 0;
  position: relative;
  z-index: 1;
  transition: color var(--transition-fast);
}

.article-item:hover h3 {
  color: var(--primary-dark);
}

.article-item .meta {
  font-size: 12px;
  color: var(--text-light);
  margin-bottom: 8px;
  position: relative;
  z-index: 1;
}

.article-item .summary {
  font-size: 14px;
  color: var(--text-secondary);
  position: relative;
  z-index: 1;
}

.article-item .read-more {
  font-size: 14px;
  font-weight: 600;
  position: relative;
  z-index: 1;
  display: inline-block;
  transition: transform var(--transition-fast), color var(--transition-fast);
}

.article-item:hover .read-more {
  transform: translateX(4px);
  color: var(--primary-dark);
}

/* ============ FAQ ============ */
.faq-item {
  border: 1px solid var(--border);
  border-radius: 10px;
  margin-bottom: 12px;
  background: var(--surface);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-base), box-shadow var(--transition-base), background-color var(--transition-base);
}

.faq-item:hover {
  border-color: rgba(56, 189, 248, 0.4);
  box-shadow: var(--shadow-md);
}

.faq-item.open {
  border-color: rgba(56, 189, 248, 0.5);
  box-shadow: 0 6px 20px rgba(56, 189, 248, 0.12);
}

.faq-q {
  width: 100%;
  text-align: left;
  background: var(--surface);
  border: none;
  padding: 16px 18px;
  font-size: 15px;
  font-weight: 600;
  color: var(--header-bg);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.faq-q:hover {
  background: var(--bg-alt);
}

.faq-q span.icon {
  color: var(--primary);
  font-weight: 700;
  font-size: 18px;
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(56, 189, 248, 0.1);
  transition: transform var(--transition-base), background-color var(--transition-fast), color var(--transition-fast);
}

.faq-item.open .faq-q span.icon {
  transform: rotate(180deg);
  background: var(--gradient-accent);
  color: #0f172a;
}

.faq-a {
  display: none;
  padding: 0 18px 16px;
  font-size: 14px;
  color: var(--text-secondary);
  animation: faqFade 0.35s ease;
}

.faq-item.open .faq-a {
  display: block;
}

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

/* ============ HowTo ============ */
.howto-step {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 18px;
  margin-bottom: 14px;
  box-shadow: var(--shadow-sm);
  position: relative;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base), background-color var(--transition-base);
}

.howto-step:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
  border-color: rgba(56, 189, 248, 0.45);
}

.howto-step .step-num {
  display: inline-block;
  background: var(--header-bg);
  color: var(--primary);
  font-weight: 700;
  border-radius: var(--radius-sm);
  padding: 2px 10px;
  font-size: 13px;
  margin-bottom: 8px;
  letter-spacing: 0.5px;
  transition: background var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast);
}

.howto-step:hover .step-num {
  background: var(--gradient-accent);
  color: #0f172a;
  box-shadow: var(--shadow-glow);
}

.howto-step h4 {
  margin-top: 0;
}

/* ============ Contact ============ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.contact-list {
  list-style: none;
  padding: 0;
}

.contact-list li {
  padding: 10px 0;
  border-bottom: 1px dashed var(--border);
  font-size: 14px;
  color: var(--text-secondary);
  transition: color var(--transition-fast), padding-left var(--transition-fast), border-color var(--transition-base);
}

.contact-list li:hover {
  color: var(--text);
  padding-left: 6px;
}

.contact-list li strong {
  color: var(--header-bg);
  margin-right: 6px;
  transition: color var(--transition-base);
}

.map-box {
  background: var(--bg-alt);
  border-radius: var(--radius-md);
  padding: 20px;
  font-size: 14px;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  transition: background-color var(--transition-base), color var(--transition-base), border-color var(--transition-base);
}

.map-box p:last-child {
  margin-bottom: 0;
}

/* ============ Tag Cloud ============ */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-cloud a {
  background: var(--bg-alt);
  border-radius: var(--radius-pill);
  padding: 5px 14px;
  font-size: 13px;
  color: #334155;
  border: 1px solid transparent;
  transition: transform var(--transition-fast), background var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.tag-cloud a:hover {
  text-decoration: none;
  transform: translateY(-3px);
  background: var(--gradient-accent);
  color: #0f172a;
  box-shadow: var(--shadow-glow);
  border-color: rgba(56, 189, 248, 0.5);
}

/* ============ Sitemap ============ */
.sitemap-cols {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.sitemap-cols h4 {
  margin-top: 0;
}

.sitemap-cols ul {
  list-style: none;
  padding: 0;
  font-size: 14px;
}

.sitemap-cols ul li {
  margin-bottom: 8px;
}

.sitemap-cols ul li a {
  display: inline-block;
  transition: transform var(--transition-fast), color var(--transition-fast);
}

.sitemap-cols ul li a:hover {
  transform: translateX(4px);
}

/* ============ Footer ============ */
footer.site-footer {
  background: var(--footer-bg);
  color: var(--text-light);
  margin-top: 30px;
  position: relative;
  overflow: hidden;
}

footer.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-accent);
}

.footer-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 40px 20px 20px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 26px;
  margin-bottom: 26px;
}

.footer-grid h4 {
  color: #e2e8f0;
  font-size: 15px;
  margin-bottom: 12px;
  position: relative;
  padding-bottom: 8px;
}

.footer-grid h4::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 26px;
  height: 2px;
  border-radius: 2px;
  background: var(--gradient-accent);
}

.footer-grid ul {
  list-style: none;
  padding: 0;
  font-size: 13px;
}

.footer-grid ul li {
  margin-bottom: 8px;
}

.footer-grid a {
  color: var(--text-light);
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.footer-grid a:hover {
  color: var(--primary);
  padding-left: 4px;
  text-decoration: none;
}

.footer-grid p {
  color: var(--text-light);
}

.footer-bottom {
  border-top: 1px solid #1e293b;
  padding-top: 18px;
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

/* ============ Back To Top ============ */
.back-to-top {
  position: fixed;
  right: 22px;
  bottom: 26px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--header-bg);
  color: var(--primary);
  border: 1px solid rgba(56, 189, 248, 0.35);
  font-size: 20px;
  cursor: pointer;
  display: none;
  z-index: 120;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast), color var(--transition-fast);
}

.back-to-top:hover {
  transform: translateY(-4px) scale(1.06);
  background: var(--gradient-accent);
  color: #0f172a;
  box-shadow: 0 8px 26px rgba(56, 189, 248, 0.45);
}

/* ============ Scroll Reveal ============ */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
  will-change: opacity, transform;
}

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

/* ============ Dark Mode ============ */
body.dark {
  --bg: #0b1220;
  --bg-alt: #0f1a2e;
  --surface: #111c2f;
  --surface-glass: rgba(17, 28, 47, 0.72);
  --surface-glass-border: rgba(56, 189, 248, 0.16);
  --text: #cbd5e1;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-light: #64748b;
  --border: #1e293b;
  --header-bg: #e2e8f0;
  background: var(--bg);
  color: var(--text);
}

body.dark .card,
body.dark .article-item,
body.dark .faq-item,
body.dark .faq-q,
body.dark .howto-step,
body.dark .case-card {
  background: #111c2f;
  border-color: #1e293b;
  color: #cbd5e1;
}

body.dark h2.section-title,
body.dark h3,
body.dark h4,
body.dark .stat-num,
body.dark .contact-list li strong {
  color: #e2e8f0;
}

body.dark p,
body.dark li,
body.dark .article-item .summary,
body.dark .faq-a {
  color: #94a3b8;
}

body.dark .breadcrumb {
  background: #0f1a2e;
  color: #94a3b8;
}

body.dark .map-box,
body.dark blockquote.quote {
  background: #111c2f;
  color: #94a3b8;
}

body.dark .tag-cloud a {
  background: #1e293b;
  color: #cbd5e1;
}

body.dark .tag-cloud a:hover {
  background: var(--gradient-accent);
  color: #0f172a;
}

body.dark .faq-q:hover {
  background: #16233a;
}

body.dark .stats {
  background: #0f1a2e;
}

body.dark .stat-num {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

body.dark .search-box {
  background: rgba(15, 26, 46, 0.8);
}

body.dark .theme-toggle,
body.dark .mobile-menu-btn {
  background: rgba(15, 26, 46, 0.8);
}

body.dark .howto-step .step-num {
  background: #1e293b;
  color: var(--primary);
}

body.dark .howto-step:hover .step-num {
  background: var(--gradient-accent);
  color: #0f172a;
}

body.dark .card::before,
body.dark .article-item::after {
  opacity: 0.6;
}

body.dark a {
  color: #7dd3fc;
}

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

/* ============ Responsive ============ */
@media (max-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .sitemap-cols {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 960px) {
  .hero-inner {
    grid-template-columns: 1fr;
    padding: 40px 20px;
  }

  .hero h1 {
    font-size: 26px;
  }

  .grid-2,
  .grid-3,
  .grid-4,
  .article-list,
  .contact-grid,
  .sitemap-cols,
  .footer-grid {
    grid-template-columns: 1fr;
  }

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

  nav.main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(15, 23, 42, 0.96);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    padding: 16px 20px;
    border-bottom: 1px solid rgba(56, 189, 248, 0.18);
    animation: navSlideDown 0.3s ease;
  }

  nav.main-nav.open {
    display: block;
  }

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

  nav.main-nav ul {
    flex-direction: column;
    gap: 14px;
  }

  nav.main-nav a {
    display: block;
    padding: 6px 0;
  }

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

  .search-box input {
    width: 90px;
  }

  .footer-grid {
    gap: 20px;
  }
}

@media (max-width: 560px) {
  body {
    font-size: 15px;
  }

  .header-inner {
    padding: 12px 14px;
    gap: 10px;
  }

  .logo {
    font-size: 17px;
  }

  .logo-mark {
    width: 28px;
    height: 28px;
  }

  .search-box {
    padding: 3px 8px;
  }

  .search-box input {
    width: 70px;
    font-size: 13px;
  }

  .search-box button {
    padding: 3px 9px;
    font-size: 12px;
  }

  .theme-toggle,
  .mobile-menu-btn {
    width: 32px;
    height: 32px;
    font-size: 14px;
  }

  .hero h1 {
    font-size: 22px;
  }

  .hero .lead {
    font-size: 14px;
  }

  .hero-inner {
    padding: 32px 16px;
  }

  h2.section-title {
    font-size: 20px;
  }

  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    padding: 22px 16px;
  }

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

  .stat-label {
    font-size: 12px;
  }

  main {
    padding: 0 16px;
  }

  section.block {
    padding: 32px 0;
  }

  .btn {
    padding: 10px 18px;
    font-size: 14px;
  }

  .carousel-slide {
    padding: 20px;
  }

  .carousel-slide h3 {
    font-size: 17px;
  }

  .card,
  .article-item,
  .howto-step {
    padding: 16px;
  }

  .footer-inner {
    padding: 30px 16px 16px;
  }

  .back-to-top {
    right: 14px;
    bottom: 18px;
    width: 40px;
    height: 40px;
    font-size: 18px;
  }
}

@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;
  }
}