:root {
  --primary: #4A90D9;
  --primary-dark: #3A7BC8;
  --primary-light: #6BA5E7;
  --accent: #FF6B9D;
  --accent-dark: #E8558A;
  --bg: #F5F7FA;
  --bg-alt: #FFFFFF;
  --bg-card: rgba(255, 255, 255, 0.75);
  --bg-glass: rgba(255, 255, 255, 0.6);
  --text: #1E2A3A;
  --text-secondary: #5A6B7F;
  --text-muted: #8A9BAE;
  --border: rgba(74, 144, 217, 0.15);
  --border-strong: rgba(74, 144, 217, 0.3);
  --shadow-sm: 0 2px 8px rgba(30, 42, 58, 0.06);
  --shadow-md: 0 8px 24px rgba(30, 42, 58, 0.1);
  --shadow-lg: 0 16px 48px rgba(30, 42, 58, 0.14);
  --shadow-glow: 0 8px 32px rgba(74, 144, 217, 0.25);
  --gradient-hero: linear-gradient(135deg, #1E2A3A 0%, #2A3F5A 40%, #4A90D9 100%);
  --gradient-accent: linear-gradient(135deg, #4A90D9 0%, #FF6B9D 100%);
  --gradient-card: linear-gradient(135deg, rgba(74, 144, 217, 0.08) 0%, rgba(255, 107, 157, 0.05) 100%);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 9999px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --max-width: 1200px;
  --header-height: 68px;
}

[data-theme="dark"] {
  --primary: #6BA5E7;
  --primary-dark: #4A90D9;
  --primary-light: #8DBEF0;
  --accent: #FF85B3;
  --accent-dark: #FF6B9D;
  --bg: #0F1621;
  --bg-alt: #16202E;
  --bg-card: rgba(30, 42, 58, 0.75);
  --bg-glass: rgba(30, 42, 58, 0.6);
  --text: #E8EEF5;
  --text-secondary: #A8B8CA;
  --text-muted: #6B7D92;
  --border: rgba(107, 165, 231, 0.15);
  --border-strong: rgba(107, 165, 231, 0.3);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 8px 32px rgba(107, 165, 231, 0.2);
  --gradient-hero: linear-gradient(135deg, #0A0F16 0%, #16202E 40%, #2A4A6A 100%);
  --gradient-card: linear-gradient(135deg, rgba(107, 165, 231, 0.08) 0%, rgba(255, 133, 179, 0.05) 100%);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 20px);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background-color: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background-color var(--transition), color var(--transition);
}

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

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

a:hover {
  color: var(--accent);
}

ul,
ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.3;
  font-weight: 700;
  color: var(--text);
}

h1 { font-size: clamp(1.75rem, 4vw, 2.75rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.35rem); }
h4 { font-size: 1.05rem; }

p {
  margin-bottom: 1em;
  color: var(--text-secondary);
}

blockquote {
  margin: 0;
}

address {
  font-style: normal;
}

::selection {
  background: var(--primary);
  color: #fff;
}

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

/* ===== HEADER ===== */
#site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: var(--bg-glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#site-header.scrolled {
  box-shadow: var(--shadow-sm);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  color: var(--text);
  transition: transform var(--transition);
}

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

.logo svg {
  width: 40px;
  height: 40px;
  transition: transform var(--transition);
}

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

.logo-text {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

#main-nav {
  flex: 1;
  display: flex;
  justify-content: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  display: block;
  padding: 8px 14px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  white-space: nowrap;
  transition: color var(--transition), background var(--transition);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--primary);
  background: rgba(74, 144, 217, 0.1);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.header-actions button {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: none;
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: color var(--transition), background var(--transition), transform var(--transition);
}

.header-actions button:hover {
  color: var(--primary);
  background: rgba(74, 144, 217, 0.12);
  transform: translateY(-1px);
}

.header-actions button:active {
  transform: scale(0.94);
}

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  width: 40px;
  height: 40px;
  border: none;
  background: transparent;
  cursor: pointer;
  padding: 10px 8px;
  gap: 5px;
  border-radius: var(--radius-full);
  transition: background var(--transition);
}

.mobile-menu-toggle:hover {
  background: rgba(74, 144, 217, 0.12);
}

.mobile-menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.mobile-menu-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.mobile-menu-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== SEARCH BAR ===== */
.search-bar {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--bg-glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height var(--transition), opacity var(--transition), padding var(--transition);
}

.search-bar.active {
  max-height: 100px;
  opacity: 1;
  padding: 12px 24px;
}

.search-bar form {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  gap: 10px;
}

.search-bar input {
  flex: 1;
  padding: 10px 18px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-full);
  background: var(--bg-alt);
  color: var(--text);
  font-size: 0.95rem;
  font-family: var(--font);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.search-bar input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(74, 144, 217, 0.15);
}

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

.search-bar button {
  padding: 10px 24px;
  border: none;
  border-radius: var(--radius-full);
  background: var(--gradient-accent);
  color: #fff;
  font-size: 0.9rem;
  font-weight: 600;
  font-family: var(--font);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
}

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

/* ===== HERO ===== */
.hero-section {
  position: relative;
  padding: calc(var(--header-height) + 60px) 24px 80px;
  background: var(--gradient-hero);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
  min-height: 600px;
}

.hero-section::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(74, 144, 217, 0.25) 0%, transparent 70%);
  border-radius: 50%;
  animation: float 8s ease-in-out infinite;
}

.hero-section::after {
  content: "";
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(255, 107, 157, 0.15) 0%, transparent 70%);
  border-radius: 50%;
  animation: float 10s ease-in-out infinite reverse;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(30px, -30px) scale(1.05); }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 620px;
  flex: 1 1 400px;
}

.hero-content h1 {
  color: #fff;
  margin-bottom: 20px;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
  animation: fadeInUp 0.8s ease both;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.15rem);
  color: rgba(255, 255, 255, 0.92);
  margin-bottom: 16px;
  animation: fadeInUp 0.8s 0.1s ease both;
}

.hero-desc {
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: 32px;
  animation: fadeInUp 0.8s 0.2s ease both;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 40px;
  animation: fadeInUp 0.8s 0.3s ease both;
}

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  border-radius: var(--radius-full);
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  text-decoration: none;
  border: none;
}

.btn-primary {
  background: var(--gradient-accent);
  color: #fff;
  box-shadow: 0 4px 20px rgba(74, 144, 217, 0.4);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(74, 144, 217, 0.5);
  color: #fff;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.25);
  transform: translateY(-3px);
  color: #fff;
}

.hero-stats {
  display: flex;
  gap: 40px;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s 0.4s ease both;
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-number {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
}

.stat-label {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.7);
  margin-top: 4px;
}

.hero-visual {
  position: relative;
  z-index: 1;
  flex: 0 1 400px;
  display: flex;
  justify-content: center;
  animation: fadeInUp 0.8s 0.3s ease both;
}

.hero-visual svg {
  width: 100%;
  max-width: 400px;
  filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.3));
  animation: floatSlow 6s ease-in-out infinite;
}

@keyframes floatSlow {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

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

.breadcrumb li {
  display: flex;
  align-items: center;
}

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

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

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

.breadcrumb [aria-current="page"] {
  color: var(--primary);
  font-weight: 500;
}

/* ===== SECTIONS ===== */
.section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 72px 24px;
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

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

.section > h2 {
  position: relative;
  display: inline-block;
  margin-bottom: 40px;
  padding-bottom: 12px;
}

.section > h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 60px;
  height: 4px;
  border-radius: 2px;
  background: var(--gradient-accent);
  transition: width var(--transition);
}

.section > h2:hover::after {
  width: 100%;
}

.section-content h3 {
  margin-top: 36px;
  margin-bottom: 16px;
  padding-left: 14px;
  border-left: 4px solid var(--primary);
  transition: border-color var(--transition), padding-left var(--transition);
}

.section-content h3:hover {
  border-color: var(--accent);
  padding-left: 20px;
}

.section-content h3:first-child {
  margin-top: 0;
}

.section-content p {
  margin-bottom: 16px;
  text-align: justify;
}

.section-content ul,
.section-content ol {
  margin-bottom: 20px;
  padding-left: 0;
}

.section-content ul li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 10px;
  color: var(--text-secondary);
  transition: color var(--transition), transform var(--transition);
}

.section-content ul li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 0.7em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gradient-accent);
  transition: transform var(--transition);
}

.section-content ul li:hover {
  color: var(--text);
  transform: translateX(4px);
}

.section-content ul li:hover::before {
  transform: scale(1.3);
}

.section-content ol {
  counter-reset: item;
}

.section-content ol li {
  position: relative;
  padding-left: 40px;
  margin-bottom: 16px;
  color: var(--text-secondary);
  counter-increment: item;
  transition: color var(--transition), transform var(--transition);
}

.section-content ol li::before {
  content: counter(item);
  position: absolute;
  left: 0;
  top: 2px;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--gradient-accent);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
  transition: transform var(--transition);
}

.section-content ol li:hover {
  color: var(--text);
  transform: translateX(4px);
}

.section-content ol li:hover::before {
  transform: scale(1.15);
}

.section-content strong {
  color: var(--text);
  font-weight: 600;
}

/* ===== TIMELINE ===== */
.timeline {
  position: relative;
  padding-left: 28px;
  margin: 20px 0 32px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--primary), var(--accent));
  border-radius: 2px;
}

.timeline li {
  position: relative;
  margin-bottom: 18px;
  padding-left: 0;
  color: var(--text-secondary);
  transition: color var(--transition), transform var(--transition);
}

.timeline li::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 0.65em;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg-alt);
  border: 3px solid var(--primary);
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
}

.timeline li:hover {
  color: var(--text);
  transform: translateX(4px);
}

.timeline li:hover::before {
  background: var(--accent);
  border-color: var(--accent);
  transform: scale(1.2);
}

/* ===== FEATURE GRID ===== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
  margin-top: 24px;
}

.feature-card {
  position: relative;
  padding: 28px 24px;
  background: var(--bg-card);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  overflow: hidden;
}

.feature-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);
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-strong);
}

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

.feature-card h4 {
  position: relative;
  margin-bottom: 12px;
  padding-left: 36px;
  color: var(--text);
  transition: color var(--transition);
}

.feature-card h4::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 24px;
  height: 24px;
  border-radius: var(--radius-sm);
  background: var(--gradient-accent);
  opacity: 0.9;
  transition: transform var(--transition), border-radius var(--transition);
}

.feature-card:hover h4::before {
  transform: translateY(-50%) rotate(45deg);
  border-radius: 4px;
}

.feature-card p {
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 0;
  color: var(--text-secondary);
}

/* ===== NEWS & ARTICLE ITEMS ===== */
.news-item,
.article-item {
  position: relative;
  padding: 28px 28px 28px 32px;
  margin-bottom: 20px;
  background: var(--bg-card);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  overflow: hidden;
}

.news-item::before,
.article-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--gradient-accent);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--transition);
}

.news-item:hover,
.article-item:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}

.news-item:hover::before,
.article-item:hover::before {
  transform: scaleY(1);
}

.news-item h3,
.article-item h3 {
  margin-bottom: 8px;
  font-size: 1.1rem;
}

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

.news-item h3 a:hover,
.article-item h3 a:hover {
  color: var(--primary);
}

.news-item time,
.article-item time {
  display: inline-block;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  padding: 2px 10px;
  background: rgba(74, 144, 217, 0.08);
  border-radius: var(--radius-full);
}

.news-item p,
.article-item p {
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 12px;
}

.read-more {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--primary);
  transition: color var(--transition), gap var(--transition);
}

.read-more::after {
  content: "→";
  transition: transform var(--transition);
}

.read-more:hover {
  color: var(--accent);
  gap: 8px;
}

.read-more:hover::after {
  transform: translateX(3px);
}

/* ===== TESTIMONIALS ===== */
#testimonials blockquote {
  position: relative;
  padding: 28px 28px 28px 56px;
  margin-bottom: 20px;
  background: var(--bg-card);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#testimonials blockquote::before {
  content: "\201C";
  position: absolute;
  left: 16px;
  top: 8px;
  font-size: 3.5rem;
  line-height: 1;
  font-family: Georgia, serif;
  color: var(--primary);
  opacity: 0.3;
  transition: opacity var(--transition), transform var(--transition);
}

#testimonials blockquote:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}

#testimonials blockquote:hover::before {
  opacity: 0.6;
  transform: scale(1.1);
}

#testimonials blockquote p {
  font-size: 0.95rem;
  font-style: italic;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

#testimonials blockquote footer {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
}

/* ===== FAQ ===== */
.faq-item {
  margin-bottom: 12px;
  background: var(--bg-card);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.faq-item[open] {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}

.faq-item summary {
  position: relative;
  padding: 20px 52px 20px 24px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  list-style: none;
  transition: color var(--transition), background var(--transition);
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(74, 144, 217, 0.1);
  color: var(--primary);
  font-size: 1.2rem;
  font-weight: 400;
  line-height: 1;
  transition: transform var(--transition), background var(--transition), color var(--transition);
}

.faq-item[open] summary::after {
  content: "−";
  transform: translateY(-50%) rotate(180deg);
  background: var(--gradient-accent);
  color: #fff;
}

.faq-item summary:hover {
  color: var(--primary);
  background: rgba(74, 144, 217, 0.05);
}

.faq-answer {
  padding: 0 24px 20px;
  animation: slideDown 0.3s ease;
}

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

.faq-answer p {
  font-size: 0.9rem;
  line-height: 1.75;
  margin-bottom: 0;
}

/* ===== FOOTER ===== */
#site-footer {
  background: var(--gradient-hero);
  color: rgba(255, 255, 255, 0.85);
  margin-top: 40px;
  position: relative;
  overflow: hidden;
}

#site-footer::before {
  content: "";
  position: absolute;
  top: -100px;
  right: -100px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(74, 144, 217, 0.15) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 56px 24px 40px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 40px;
  position: relative;
  z-index: 1;
}

.footer-section h3 {
  margin-bottom: 18px;
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  position: relative;
  padding-bottom: 10px;
}

.footer-section h3::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 32px;
  height: 3px;
  border-radius: 2px;
  background: var(--gradient-accent);
}

.footer-section ul li {
  margin-bottom: 10px;
}

.footer-section ul li a {
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.65);
  transition: color var(--transition), padding-left var(--transition);
  display: inline-block;
}

.footer-section ul li a:hover {
  color: #fff;
  padding-left: 6px;
}

.footer-section p {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 10px;
  line-height: 1.7;
}

.footer-bottom {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 20px 24px 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  position: relative;
  z-index: 1;
}

.footer-bottom p {
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: 6px;
}

/* ===== BACK TO TOP ===== */
#back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 900;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: var(--radius-full);
  background: var(--gradient-accent);
  color: #fff;
  cursor: pointer;
  box-shadow: var(--shadow-glow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: opacity var(--transition), visibility var(--transition), transform var(--transition), box-shadow var(--transition);
}

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

#back-to-top:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 12px 40px rgba(74, 144, 217, 0.5);
}

#back-to-top:active {
  transform: translateY(-2px) scale(0.98);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .nav-list {
    gap: 0;
  }

  .nav-link {
    padding: 8px 10px;
    font-size: 0.85rem;
  }

  .hero-section {
    flex-direction: column;
    text-align: center;
    padding: calc(var(--header-height) + 40px) 24px 60px;
  }

  .hero-content {
    max-width: 100%;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-stats {
    justify-content: center;
  }

  .hero-visual {
    flex: 0 1 320px;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  .header-inner {
    padding: 0 16px;
  }

  .logo-text {
    font-size: 1.15rem;
  }

  .logo svg {
    width: 34px;
    height: 34px;
  }

  #main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.4s ease, opacity 0.3s ease, padding 0.3s ease;
    justify-content: flex-start;
  }

  #main-nav.open {
    max-height: 500px;
    opacity: 1;
    padding: 12px 0;
    overflow-y: auto;
  }

  .nav-list {
    flex-direction: column;
    width: 100%;
    gap: 0;
    padding: 0 16px;
  }

  .nav-link {
    padding: 12px 16px;
    font-size: 0.95rem;
    border-radius: var(--radius-sm);
    width: 100%;
  }

  .mobile-menu-toggle {
    display: flex;
  }

  .section {
    padding: 48px 16px;
  }

  .section > h2 {
    margin-bottom: 28px;
  }

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

  .feature-card {
    padding: 22px 20px;
  }

  .news-item,
  .article-item {
    padding: 22px 20px 22px 24px;
  }

  #testimonials blockquote {
    padding: 24px 20px 24px 48px;
  }

  #testimonials blockquote::before {
    left: 12px;
    font-size: 2.8rem;
  }

  .faq-item summary {
    padding: 16px 48px 16px 18px;
    font-size: 0.95rem;
  }

  .faq-answer {
    padding: 0 18px 16px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 40px 16px 28px;
  }

  .footer-bottom {
    padding: 16px 16px 24px;
  }

  #back-to-top {
    right: 16px;
    bottom: 16px;
    width: 44px;
    height: 44px;
  }

  .hero-stats {
    gap: 24px;
  }

  .stat-number {
    font-size: 1.4rem;
  }

  .btn-primary,
  .btn-secondary {
    padding: 12px 24px;
    font-size: 0.9rem;
  }
}

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

  .hero-section {
    min-height: auto;
    padding: calc(var(--header-height) + 32px) 16px 48px;
  }

  .hero-visual {
    flex: 0 1 260px;
  }

  .hero-stats {
    gap: 20px;
  }

  .stat-item {
    min-width: 80px;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .btn-primary,
  .btn-secondary {
    width: 100%;
  }

  .section-content ul li {
    padding-left: 20px;
  }

  .section-content ol li {
    padding-left: 34px;
  }

  .section-content ol li::before {
    width: 22px;
    height: 22px;
    font-size: 0.75rem;
  }
}

/* ===== 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;
  }

  .section {
    opacity: 1;
    transform: none;
  }
}

/* ===== PRINT ===== */
@media print {
  #site-header,
  #back-to-top,
  .hero-visual,
  .search-bar {
    display: none !important;
  }

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

  .section {
    opacity: 1;
    transform: none;
    padding: 20px 0;
  }

  .feature-card,
  .news-item,
  .article-item,
  .faq-item {
    box-shadow: none;
    border: 1px solid #ddd;
    break-inside: avoid;
  }
}