:root {
  --bg-body: #f5f7fb;
  --bg-card: rgba(255, 255, 255, 0.72);
  --bg-card-solid: #ffffff;
  --bg-nav: rgba(255, 255, 255, 0.78);
  --bg-footer: #0e1a2b;
  --bg-banner: linear-gradient(135deg, #e8f0fe 0%, #dbe8fc 50%, #e9e4fb 100%);
  --bg-tag: rgba(26, 59, 92, 0.08);
  --bg-btn-primary: linear-gradient(135deg, #1a3b5c, #2a5a8a);
  --bg-btn-primary-hover: linear-gradient(135deg, #12304a, #1e4a73);
  --bg-btn-secondary: rgba(255, 255, 255, 0.65);
  --bg-btn-secondary-hover: rgba(255, 255, 255, 0.9);
  --bg-input: rgba(255, 255, 255, 0.6);
  --bg-faq-open: rgba(240, 244, 250, 0.7);
  --bg-table-head: rgba(230, 236, 244, 0.85);
  --bg-table-row-alt: rgba(249, 251, 254, 0.7);
  --bg-glass: rgba(255, 255, 255, 0.55);
  --bg-glass-border: rgba(255, 255, 255, 0.6);
  --bg-glass-hover: rgba(255, 255, 255, 0.75);

  --text-primary: #17202a;
  --text-secondary: #2c3e50;
  --text-muted: #4a5a6a;
  --text-light-muted: #5d6f7e;
  --text-inverse: #ffffff;
  --text-link: #1a5b8e;
  --text-link-hover: #0e3d61;
  --text-heading: #0b1a2a;
  --text-nav: #1f2e3d;
  --text-nav-hover: #1a5b8e;
  --text-footer: #a8b8c8;
  --text-footer-heading: #f0f5fa;
  --text-btn-primary: #ffffff;
  --text-btn-secondary: #1a3b5c;
  --text-tag: #1f2e3d;
  --text-faq-q: #0b1a2a;
  --text-faq-a: #2c3e50;
  --text-placeholder: #6b7b8b;
  --text-error: #b91c1c;
  --text-success: #166534;

  --border-color: rgba(209, 219, 230, 0.7);
  --border-light: rgba(226, 232, 240, 0.6);
  --shadow-sm: 0 2px 8px rgba(26, 59, 92, 0.06);
  --shadow-md: 0 8px 24px rgba(26, 59, 92, 0.10);
  --shadow-lg: 0 16px 48px rgba(26, 59, 92, 0.14);
  --shadow-glow: 0 0 0 1px rgba(255, 255, 255, 0.4), 0 8px 32px rgba(26, 59, 92, 0.12);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --transition-speed: 0.28s;
  --transition-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
}

[data-theme="dark"] {
  --bg-body: #0a1018;
  --bg-card: rgba(26, 37, 51, 0.68);
  --bg-card-solid: #1a2533;
  --bg-nav: rgba(15, 23, 34, 0.82);
  --bg-footer: #060b12;
  --bg-banner: linear-gradient(135deg, #101c2e 0%, #14243a 50%, #1a1a3a 100%);
  --bg-tag: rgba(126, 184, 224, 0.12);
  --bg-btn-primary: linear-gradient(135deg, #2a5a8a, #3a7ab8);
  --bg-btn-primary-hover: linear-gradient(135deg, #1e4a73, #2a5a8a);
  --bg-btn-secondary: rgba(37, 48, 64, 0.7);
  --bg-btn-secondary-hover: rgba(47, 62, 82, 0.9);
  --bg-input: rgba(30, 42, 56, 0.6);
  --bg-faq-open: rgba(30, 42, 56, 0.6);
  --bg-table-head: rgba(30, 42, 56, 0.85);
  --bg-table-row-alt: rgba(26, 37, 51, 0.6);
  --bg-glass: rgba(26, 37, 51, 0.5);
  --bg-glass-border: rgba(126, 184, 224, 0.12);
  --bg-glass-hover: rgba(26, 37, 51, 0.7);

  --text-primary: #e5e7eb;
  --text-secondary: #d1d9e6;
  --text-muted: #a0aec0;
  --text-light-muted: #8b9bb4;
  --text-inverse: #0f1722;
  --text-link: #7eb8e0;
  --text-link-hover: #a8d0f0;
  --text-heading: #f8fafc;
  --text-nav: #e2e8f0;
  --text-nav-hover: #7eb8e0;
  --text-footer: #8b9bb4;
  --text-footer-heading: #f1f5f9;
  --text-btn-primary: #ffffff;
  --text-btn-secondary: #d1d9e6;
  --text-tag: #d1d9e6;
  --text-faq-q: #f1f5f9;
  --text-faq-a: #d1d9e6;
  --text-placeholder: #8b9bb4;
  --text-error: #f87171;
  --text-success: #6ee7b7;

  --border-color: rgba(45, 58, 74, 0.7);
  --border-light: rgba(37, 48, 64, 0.6);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.45);
  --shadow-glow: 0 0 0 1px rgba(126, 184, 224, 0.08), 0 8px 32px rgba(0, 0, 0, 0.4);
}

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

body::before {
  content: '';
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 20% 20%, rgba(42, 90, 138, 0.06) 0%, transparent 50%),
              radial-gradient(circle at 80% 80%, rgba(126, 184, 224, 0.05) 0%, transparent 50%);
  pointer-events: none;
  z-index: -1;
}

[data-theme="dark"] body::before {
  background: radial-gradient(circle at 20% 20%, rgba(42, 90, 138, 0.12) 0%, transparent 50%),
              radial-gradient(circle at 80% 80%, rgba(126, 184, 224, 0.08) 0%, transparent 50%);
}

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

h1 { font-size: 2rem; margin-bottom: 0.75rem; }
h2 { font-size: 1.65rem; margin-bottom: 0.65rem; margin-top: 2rem; }
h3 { font-size: 1.3rem; margin-bottom: 0.5rem; margin-top: 1.5rem; }
h4 { font-size: 1.1rem; margin-bottom: 0.4rem; margin-top: 1.2rem; }

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

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

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

a:focus-visible {
  outline: 2px solid var(--text-link);
  outline-offset: 2px;
  border-radius: 2px;
}

ul, ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
  color: var(--text-primary);
}

li {
  margin-bottom: 0.35rem;
}

strong {
  color: var(--text-heading);
}

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

.section {
  padding: 3rem 0;
}

.section-title {
  text-align: center;
  margin-bottom: 2.5rem;
}

.section-title h2 {
  margin-top: 0;
  color: var(--text-heading);
  position: relative;
  display: inline-block;
}

.section-title h2::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 48px;
  height: 3px;
  border-radius: 2px;
  background: var(--bg-btn-primary);
}

.section-title p {
  color: var(--text-muted);
  max-width: 700px;
  margin: 1rem auto 0;
}

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

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.nav-logo {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-heading);
  letter-spacing: 0.3px;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: transform var(--transition-speed) var(--transition-bounce);
}

.nav-logo:hover {
  transform: scale(1.04);
  text-decoration: none;
}

.nav-logo svg {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  border-radius: 8px;
  transition: box-shadow var(--transition-speed) ease;
}

.nav-logo:hover svg {
  box-shadow: 0 0 0 3px rgba(42, 90, 138, 0.2);
}

.nav-logo span {
  color: var(--text-heading);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 0.25rem;
  margin: 0;
  padding: 0;
  align-items: center;
}

.nav-menu li a {
  color: var(--text-nav);
  font-weight: 500;
  font-size: 0.9rem;
  padding: 0.45rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition-speed) ease, background-color var(--transition-speed) ease;
  position: relative;
}

.nav-menu li a::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 60%;
  height: 2px;
  border-radius: 1px;
  background: var(--text-nav-hover);
  transition: transform var(--transition-speed) var(--transition-bounce);
}

.nav-menu li a:hover,
.nav-menu li a:focus {
  color: var(--text-nav-hover);
  background-color: var(--bg-tag);
  text-decoration: none;
}

.nav-menu li a:hover::after,
.nav-menu li a:focus::after {
  transform: translateX(-50%) scaleX(1);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.search-box {
  display: flex;
  align-items: center;
  background-color: var(--bg-input);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border-color);
  border-radius: 999px;
  padding: 0 6px 0 14px;
  transition: border-color var(--transition-speed) ease, background-color var(--transition-speed) ease, box-shadow var(--transition-speed) ease, width var(--transition-speed) ease;
}

.search-box input {
  border: none;
  background: transparent;
  padding: 7px 4px;
  font-size: 0.88rem;
  color: var(--text-primary);
  outline: none;
  width: 130px;
  font-family: var(--font-sans);
  transition: width var(--transition-speed) ease;
}

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

.search-box button {
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  border-radius: 50%;
  transition: color var(--transition-speed) ease, background-color var(--transition-speed) ease;
}

.search-box button:hover {
  color: var(--text-link);
  background-color: var(--bg-tag);
}

.search-box:focus-within {
  border-color: var(--text-link);
  box-shadow: 0 0 0 3px rgba(26, 91, 142, 0.12);
  background-color: var(--bg-card-solid);
}

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

.theme-toggle {
  background: var(--bg-btn-secondary);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border-color);
  border-radius: 50%;
  cursor: pointer;
  padding: 0;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-nav);
  transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease, color var(--transition-speed) ease, transform var(--transition-speed) var(--transition-bounce);
}

.theme-toggle:hover {
  background-color: var(--bg-btn-secondary-hover);
  color: var(--text-heading);
  transform: rotate(20deg) scale(1.08);
}

.mobile-menu-btn {
  display: none;
  background: var(--bg-btn-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 6px 8px;
  color: var(--text-nav);
  transition: background-color var(--transition-speed) ease;
}

.mobile-menu-btn:hover {
  background-color: var(--bg-btn-secondary-hover);
}

.breadcrumb {
  padding: 0.75rem 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

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

.breadcrumb span {
  margin: 0 6px;
  color: var(--text-light-muted);
}

.hero {
  background: var(--bg-banner);
  padding: 3.5rem 0 3rem;
  transition: background var(--transition-speed) ease;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -120px;
  right: -120px;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(42, 90, 138, 0.12) 0%, transparent 70%);
  pointer-events: none;
  animation: floatBlob 12s ease-in-out infinite;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -100px;
  left: -80px;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(126, 184, 224, 0.1) 0%, transparent 70%);
  pointer-events: none;
  animation: floatBlob 15s ease-in-out infinite reverse;
}

@keyframes floatBlob {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -20px) scale(1.08); }
  66% { transform: translate(-20px, 15px) scale(0.95); }
}

.hero-content {
  display: flex;
  align-items: center;
  gap: 2.5rem;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}

.hero-text {
  flex: 1 1 500px;
}

.hero-text h1 {
  font-size: 2.2rem;
  margin-bottom: 1rem;
  color: var(--text-heading);
  line-height: 1.25;
}

.hero-text p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  max-width: 620px;
}

.hero-stats {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
  margin-bottom: 1.8rem;
}

.hero-stat-item {
  text-align: center;
  padding: 0.5rem 1rem;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-md);
  min-width: 100px;
  transition: transform var(--transition-speed) var(--transition-bounce), box-shadow var(--transition-speed) ease, background-color var(--transition-speed) ease;
}

.hero-stat-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  background: var(--bg-glass-hover);
}

.hero-stat-number {
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--text-heading);
  display: block;
  line-height: 1.2;
}

.hero-stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 0.7rem 1.6rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.92rem;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease, border-color var(--transition-speed) ease, transform var(--transition-speed) var(--transition-bounce), box-shadow var(--transition-speed) ease;
  text-align: center;
  font-family: var(--font-sans);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.18), transparent);
  transition: left 0.5s ease;
}

.btn:hover::before {
  left: 100%;
}

.btn-primary {
  background: var(--bg-btn-primary);
  color: var(--text-btn-primary);
  border-color: transparent;
  box-shadow: 0 4px 14px rgba(26, 59, 92, 0.25);
}

.btn-primary:hover {
  background: var(--bg-btn-primary-hover);
  color: var(--text-btn-primary);
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(26, 59, 92, 0.35);
}

.btn-secondary {
  background: var(--bg-btn-secondary);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: var(--text-btn-secondary);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-btn-secondary-hover);
  color: var(--text-btn-secondary);
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.hero-visual {
  flex: 1 1 360px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-visual svg {
  width: 100%;
  max-width: 420px;
  height: auto;
  filter: drop-shadow(0 12px 32px rgba(26, 59, 92, 0.12));
  animation: heroFloat 6s ease-in-out infinite;
}

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

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.card {
  background: var(--bg-card);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: 1.5rem;
  border: 1px solid var(--bg-glass-border);
  transition: box-shadow var(--transition-speed) ease, transform var(--transition-speed) var(--transition-bounce), background-color var(--transition-speed) ease, border-color var(--transition-speed) ease;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--bg-btn-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-speed) ease;
}

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

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-5px);
  background: var(--bg-glass-hover);
}

.card h3 {
  margin-top: 0;
  color: var(--text-heading);
  font-size: 1.12rem;
}

.card p {
  color: var(--text-secondary);
  font-size: 0.92rem;
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--bg-tag);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  color: var(--text-heading);
  transition: transform var(--transition-speed) var(--transition-bounce), background-color var(--transition-speed) ease;
}

.card:hover .card-icon {
  transform: scale(1.1) rotate(-5deg);
  background: rgba(26, 59, 92, 0.14);
}

.card a {
  color: var(--text-link);
  font-weight: 500;
}

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

.article-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.5rem;
}

.article-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  border-radius: var(--radius-md);
  border: 1px solid var(--bg-glass-border);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-speed) ease, background-color var(--transition-speed) ease, border-color var(--transition-speed) ease, transform var(--transition-speed) var(--transition-bounce);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.article-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, #2a5a8a, #7eb8e0);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-speed) ease;
}

.article-card:hover::after {
  transform: scaleX(1);
}

.article-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  background: var(--bg-glass-hover);
}

.article-card h3 {
  margin-top: 0;
  font-size: 1.08rem;
  color: var(--text-heading);
  transition: color var(--transition-speed) ease;
}

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

.article-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.6rem;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.article-summary {
  color: var(--text-secondary);
  font-size: 0.9rem;
  flex: 1;
}

.article-link {
  margin-top: 0.8rem;
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--text-link);
  align-self: flex-start;
  transition: color var(--transition-speed) ease, transform var(--transition-speed) ease;
}

.article-link:hover {
  color: var(--text-link-hover);
  transform: translateX(4px);
  text-decoration: none;
}

.faq-list {
  max-width: 900px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-sm);
  margin-bottom: 0.75rem;
  overflow: hidden;
  transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}

.faq-item:hover {
  box-shadow: var(--shadow-sm);
}

.faq-item.open {
  box-shadow: var(--shadow-md);
  border-color: rgba(42, 90, 138, 0.25);
}

.faq-question {
  padding: 1.1rem 1.25rem;
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--text-faq-q);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: none;
  border: none;
  width: 100%;
  text-align: left;
  font-family: var(--font-sans);
  transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
  gap: 1rem;
}

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

.faq-question .faq-icon {
  font-size: 1.2rem;
  color: var(--text-muted);
  transition: transform var(--transition-speed) var(--transition-bounce), color var(--transition-speed) ease;
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--bg-tag);
}

.faq-item.open .faq-question .faq-icon {
  transform: rotate(45deg);
  color: var(--text-link);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
  padding: 0 1.25rem;
  color: var(--text-faq-a);
  font-size: 0.92rem;
  background: var(--bg-faq-open);
}

.faq-item.open .faq-answer {
  max-height: 600px;
  padding: 1rem 1.25rem;
}

.howto-steps {
  max-width: 900px;
  margin: 0 auto;
}

.howto-step {
  display: flex;
  gap: 1.25rem;
  margin-bottom: 1.25rem;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease, transform var(--transition-speed) var(--transition-bounce), box-shadow var(--transition-speed) ease;
}

.howto-step:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
  background: var(--bg-glass-hover);
}

.howto-step-number {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--bg-btn-primary);
  color: var(--text-btn-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.05rem;
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(26, 59, 92, 0.25);
  transition: transform var(--transition-speed) var(--transition-bounce);
}

.howto-step:hover .howto-step-number {
  transform: scale(1.12);
}

.howto-step-content h4 {
  margin-top: 0;
  color: var(--text-heading);
}

.howto-step-content p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  margin-bottom: 0.3rem;
}

.table-wrapper {
  overflow-x: auto;
  margin-bottom: 1.5rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius-md);
  overflow: hidden;
}

th {
  background: var(--bg-table-head);
  color: var(--text-heading);
  font-weight: 600;
  padding: 0.85rem 1rem;
  text-align: left;
  border-bottom: 2px solid var(--border-color);
}

td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-primary);
}

tr:nth-child(even) td {
  background: var(--bg-table-row-alt);
}

tr {
  transition: background-color var(--transition-speed) ease;
}

tr:hover td {
  background: var(--bg-faq-open);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.tag {
  background: var(--bg-tag);
  color: var(--text-tag);
  padding: 0.28rem 0.8rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 500;
  transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease, transform var(--transition-speed) var(--transition-bounce);
  cursor: default;
}

.tag:hover {
  transform: translateY(-2px);
  background: rgba(26, 59, 92, 0.15);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.5rem;
}

.contact-item {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-md);
  padding: 1.35rem;
  transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease, transform var(--transition-speed) var(--transition-bounce), box-shadow var(--transition-speed) ease;
}

.contact-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  background: var(--bg-glass-hover);
}

.contact-item h4 {
  margin-top: 0;
  color: var(--text-heading);
  font-size: 1rem;
  margin-bottom: 0.6rem;
}

.contact-item p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 0.25rem;
}

.footer {
  background: var(--bg-footer);
  color: var(--text-footer);
  padding: 3rem 0 1.5rem;
  transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
  margin-top: 2rem;
  position: relative;
  overflow: hidden;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(126, 184, 224, 0.3), transparent);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-col h4 {
  color: var(--text-footer-heading);
  font-size: 1rem;
  margin-bottom: 0.85rem;
  margin-top: 0;
}

.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-col ul li {
  margin-bottom: 0.45rem;
}

.footer-col ul li a {
  color: var(--text-footer);
  font-size: 0.88rem;
  transition: color var(--transition-speed) ease, padding-left var(--transition-speed) ease;
  display: inline-block;
}

.footer-col ul li a:hover {
  color: var(--text-footer-heading);
  text-decoration: none;
  padding-left: 4px;
}

.footer-col p {
  color: var(--text-footer);
  font-size: 0.88rem;
  margin-bottom: 0.3rem;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.82rem;
  color: var(--text-footer);
}

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

.footer-bottom a:hover {
  color: var(--text-footer-heading);
}

.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-btn-primary);
  color: var(--text-btn-primary);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity var(--transition-speed) ease, visibility var(--transition-speed) ease, background-color var(--transition-speed) ease, transform var(--transition-speed) var(--transition-bounce), box-shadow var(--transition-speed) ease;
  z-index: 900;
  font-size: 1.2rem;
}

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

.back-to-top:hover {
  background: var(--bg-btn-primary-hover);
  transform: translateY(-4px) scale(1.06);
  box-shadow: var(--shadow-lg);
}

.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.65s cubic-bezier(0.22, 1, 0.36, 1), transform 0.65s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: opacity, transform;
}

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

.text-center { text-align: center; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }

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

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

.highlight {
  color: var(--text-heading);
  font-weight: 600;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

::selection {
  background: var(--text-link);
  color: #ffffff;
}

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

@media (max-width: 900px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg-nav);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    flex-direction: column;
    padding: 1rem 1.5rem;
    gap: 0.25rem;
    border-bottom: 1px solid var(--border-light);
    box-shadow: var(--shadow-lg);
    align-items: stretch;
  }

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

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

  .nav-menu li a {
    display: block;
    padding: 0.6rem 0.75rem;
    border-radius: var(--radius-sm);
  }

  .nav-menu li a::after {
    display: none;
  }

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

  .search-box input {
    width: 100px;
  }

  .hero-text h1 {
    font-size: 1.7rem;
  }

  .hero-content {
    flex-direction: column;
  }

  .hero-stats {
    gap: 1rem;
  }

  .hero-visual {
    order: -1;
  }

  .hero-visual svg {
    max-width: 300px;
  }

  .section {
    padding: 2.2rem 0;
  }
}

@media (max-width: 600px) {
  .hero-text h1 {
    font-size: 1.45rem;
  }

  .hero {
    padding: 2.2rem 0 2rem;
  }

  .section {
    padding: 1.8rem 0;
  }

  .section-title {
    margin-bottom: 1.8rem;
  }

  .card-grid,
  .article-list {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .search-box {
    display: none;
  }

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

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

  .hero-stat-item {
    min-width: 80px;
    padding: 0.4rem 0.7rem;
  }

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

  .howto-step {
    flex-direction: column;
    gap: 0.75rem;
  }

  .howto-step:hover {
    transform: translateY(-3px);
  }

  .back-to-top {
    bottom: 1.2rem;
    right: 1.2rem;
    width: 40px;
    height: 40px;
  }
}

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

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

@media print {
  .navbar,
  .back-to-top,
  .theme-toggle,
  .mobile-menu-btn,
  .search-box,
  .hero-visual {
    display: none !important;
  }

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

  .card,
  .article-card,
  .faq-item,
  .howto-step {
    box-shadow: none;
    border: 1px solid #ddd;
  }
}