:root {
  --primary: #0284C7;
  --secondary: #0C4A6E;
  --accent: #FBBF24;
  --bg-dark: #082F49;
  --bg-mid: #0E3A5C;
  --bg-light: rgba(255, 255, 255, 0.05);
  --text-main: #F0F9FF;
  --text-muted: #64748B;
  --border-glow: rgba(2, 132, 199, 0.45);
  --ice-frost: rgba(186, 230, 253, 0.18);
  --ice-deep: #075985;
}

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

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

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.65;
  overflow-x: hidden;
  min-height: 100vh;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.25s ease;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

ul, ol {
  list-style: none;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: linear-gradient(180deg, rgba(8, 47, 73, 0.92) 0%, rgba(8, 47, 73, 0.65) 80%, rgba(8, 47, 73, 0) 100%);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: padding 0.3s ease, background 0.3s ease;
}

.site-header.scrolled {
  background: rgba(8, 47, 73, 0.95);
  box-shadow: 0 4px 30px rgba(2, 132, 199, 0.25);
}

.nav-bar {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: clamp(1.15rem, 2.6vw, 1.45rem);
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--text-main);
}

.nav-brand .brand-mark {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #BAE6FD, var(--primary) 70%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--bg-dark);
  font-size: 1.1rem;
  box-shadow: 0 0 18px var(--border-glow);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.6rem;
}

.nav-links a {
  font-size: 0.98rem;
  color: var(--text-main);
  position: relative;
  padding: 0.35rem 0;
  opacity: 0.85;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transition: width 0.3s ease;
}

.nav-links a:hover,
.nav-links a.active {
  opacity: 1;
}

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

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: rgba(2, 132, 199, 0.18);
  border: 1px solid var(--border-glow);
  align-items: center;
  justify-content: center;
  color: var(--text-main);
  font-size: 1.25rem;
}

@media (max-width: 767px) {
  .nav-toggle {
    display: flex;
  }
  .nav-links {
    position: fixed;
    top: 0;
    right: 0;
    width: 78%;
    max-width: 320px;
    height: 100vh;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    padding: 5rem 1.5rem 2rem;
    background: linear-gradient(180deg, var(--secondary), var(--bg-dark));
    transform: translateX(100%);
    transition: transform 0.35s ease;
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.45);
    gap: 1.1rem;
  }
  .nav-links.open {
    transform: translateX(0);
  }
  .nav-links a {
    width: 100%;
    font-size: 1.05rem;
    padding: 0.6rem 0.8rem;
    border-left: 3px solid transparent;
  }
  .nav-links a:hover,
  .nav-links a.active {
    border-left-color: var(--accent);
    background: rgba(2, 132, 199, 0.12);
  }
  .nav-links a::after {
    display: none;
  }
}

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 6rem 1.25rem 3rem;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 20%, rgba(56, 189, 248, 0.35), transparent 45%),
    radial-gradient(circle at 80% 70%, rgba(12, 74, 110, 0.55), transparent 50%),
    linear-gradient(135deg, var(--bg-dark) 0%, var(--secondary) 60%, #062237 100%);
  z-index: -2;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(rgba(186, 230, 253, 0.08) 1px, transparent 1px),
    radial-gradient(rgba(186, 230, 253, 0.05) 1px, transparent 1px);
  background-size: 40px 40px, 80px 80px;
  background-position: 0 0, 20px 20px;
  z-index: -1;
  animation: snowDrift 18s linear infinite;
}

@keyframes snowDrift {
  0% { background-position: 0 0, 20px 20px; }
  100% { background-position: 80px 80px, 100px 100px; }
}

.hero-inner {
  max-width: 1100px;
  width: 100%;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
}

@media (max-width: 767px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 2rem;
    text-align: center;
  }
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.95rem;
  border-radius: 999px;
  background: rgba(2, 132, 199, 0.18);
  border: 1px solid var(--border-glow);
  font-size: 0.85rem;
  color: #BAE6FD;
  margin-bottom: 1.2rem;
}

@media (max-width: 767px) {
  .hero-tag {
    margin-left: auto;
    margin-right: auto;
  }
}

.hero-title {
  font-size: clamp(2.2rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1rem;
  background: linear-gradient(120deg, #FFFFFF 0%, #BAE6FD 40%, #0EA5E9 80%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: 0.02em;
}

.hero-sub {
  font-size: clamp(1rem, 2vw, 1.18rem);
  color: #CBD5E1;
  margin-bottom: 1.8rem;
  max-width: 540px;
}

@media (max-width: 767px) {
  .hero-sub {
    margin-left: auto;
    margin-right: auto;
  }
}

.hero-stats {
  display: flex;
  gap: 1.6rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

@media (max-width: 767px) {
  .hero-stats {
    justify-content: center;
  }
}

.hero-stats .stat {
  display: flex;
  flex-direction: column;
}

.hero-stats .stat-num {
  font-size: clamp(1.4rem, 3vw, 1.85rem);
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
}

.hero-stats .stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.btn-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

@media (max-width: 767px) {
  .btn-row {
    justify-content: center;
  }
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.9rem 1.8rem;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--primary), #38BDF8);
  color: #FFFFFF;
  font-weight: 700;
  font-size: 1.02rem;
  box-shadow: 0 8px 24px rgba(2, 132, 199, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.25);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 14px 30px rgba(2, 132, 199, 0.6), 0 0 20px rgba(56, 189, 248, 0.45);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.9rem 1.7rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-main);
  font-weight: 600;
  border: 1px solid rgba(186, 230, 253, 0.35);
  backdrop-filter: blur(6px);
  transition: background 0.25s ease, border-color 0.25s ease;
}

.btn-ghost:hover {
  background: rgba(186, 230, 253, 0.1);
  border-color: var(--accent);
  color: var(--accent);
}

.btn-accent {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.6rem;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), #F59E0B);
  color: #422006;
  font-weight: 700;
  box-shadow: 0 6px 18px rgba(251, 191, 36, 0.35);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 22px rgba(251, 191, 36, 0.55);
}

.btn-cube {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.3rem;
  border-radius: 4px;
  background: var(--secondary);
  color: var(--text-main);
  font-weight: 600;
  border-left: 3px solid var(--accent);
  border-right: 1px solid var(--border-glow);
  transition: background 0.2s ease, transform 0.2s ease;
}

.btn-cube:hover {
  background: var(--ice-deep);
  transform: translateX(2px);
}

.hero-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-logo {
  width: clamp(220px, 30vw, 340px);
  border-radius: 24px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5), 0 0 60px rgba(56, 189, 248, 0.35);
  border: 1px solid rgba(186, 230, 253, 0.25);
}

.hero-visual::before {
  content: "";
  position: absolute;
  inset: -20px;
  border-radius: 30px;
  background: conic-gradient(from 0deg, transparent, rgba(56, 189, 248, 0.3), transparent 60%);
  filter: blur(20px);
  z-index: -1;
  animation: spin 12s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.section {
  padding: 5rem 1.25rem;
  position: relative;
}

.section-alt {
  background: linear-gradient(180deg, var(--bg-dark) 0%, #0A3A5C 50%, var(--bg-dark) 100%);
}

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

.section-title {
  font-size: clamp(1.7rem, 4vw, 2.5rem);
  font-weight: 800;
  margin-bottom: 0.8rem;
  position: relative;
  display: inline-block;
  padding-bottom: 0.6rem;
  color: var(--text-main);
}

.section-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 60%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), transparent);
  border-radius: 2px;
}

.section-title.center {
  display: block;
  text-align: center;
}

.section-title.center::after {
  left: 50%;
  transform: translateX(-50%);
}

.section-title.bar-left {
  padding-left: 1rem;
}

.section-title.bar-left::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 5px;
  height: 75%;
  background: linear-gradient(180deg, var(--primary), var(--accent));
  border-radius: 3px;
}

.section-title.bar-left::after {
  left: 0;
}

.section-sub {
  color: var(--text-muted);
  font-size: 0.98rem;
  margin-bottom: 2.5rem;
  max-width: 680px;
}

.section-title.center + .section-sub {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

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

.feature-card {
  position: relative;
  padding: 2rem 1.6rem;
  border-radius: 16px;
  background: rgba(12, 74, 110, 0.4);
  border: 1px solid rgba(56, 189, 248, 0.18);
  backdrop-filter: blur(8px);
  overflow: hidden;
  transition: transform 0.35s ease, box-shadow 0.35s ease, border-color 0.35s ease;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.35), 0 0 30px rgba(56, 189, 248, 0.25);
  border-color: var(--accent);
}

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

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 1.1rem;
  background: linear-gradient(135deg, rgba(2, 132, 199, 0.35), rgba(56, 189, 248, 0.15));
  color: #BAE6FD;
  border: 1px solid var(--border-glow);
}

.feature-card h3 {
  font-size: 1.2rem;
  margin-bottom: 0.6rem;
  color: var(--text-main);
}

.feature-card p {
  color: #94A3B8;
  font-size: 0.95rem;
  line-height: 1.7;
}

.split-feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: center;
  margin-bottom: 4rem;
}

.split-feature:nth-child(even) .split-text {
  order: 2;
}

@media (max-width: 767px) {
  .split-feature {
    grid-template-columns: 1fr;
    gap: 1.6rem;
  }
  .split-feature:nth-child(even) .split-text {
    order: 0;
  }
}

.split-image {
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid rgba(56, 189, 248, 0.25);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.4);
  transition: transform 0.4s ease;
}

.split-image:hover {
  transform: scale(1.03);
}

.split-image img {
  width: 100%;
  height: 280px;
  object-fit: cover;
}

.split-text h3 {
  font-size: clamp(1.4rem, 3vw, 1.85rem);
  margin-bottom: 1rem;
  color: var(--text-main);
}

.split-text p {
  color: #CBD5E1;
  margin-bottom: 1rem;
}

.split-bullets {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-top: 1rem;
}

.split-bullets li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: #BAE6FD;
  font-size: 0.96rem;
}

.split-bullets li i {
  color: var(--accent);
}

.code-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

.code-card {
  position: relative;
  padding: 1.6rem 1.4rem;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(7, 89, 133, 0.55), rgba(12, 74, 110, 0.35));
  border: 1px solid rgba(56, 189, 248, 0.22);
  overflow: hidden;
  transition: transform 0.3s ease, border-color 0.3s ease;
}

.code-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top right, rgba(56, 189, 248, 0.18), transparent 60%);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.code-card:hover {
  transform: translateY(-4px) rotate(-0.5deg);
  border-color: var(--accent);
}

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

.code-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.code-tag {
  font-family: "Courier New", monospace;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: 0.05em;
}

.code-badge {
  font-size: 0.72rem;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  background: rgba(56, 189, 248, 0.18);
  color: #BAE6FD;
  border: 1px solid var(--border-glow);
}

.code-content {
  color: #CBD5E1;
  font-size: 0.92rem;
  margin-bottom: 1.1rem;
  min-height: 48px;
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 1rem;
  border-radius: 8px;
  background: var(--primary);
  color: #FFFFFF;
  font-size: 0.86rem;
  font-weight: 600;
  transition: background 0.2s ease, transform 0.2s ease;
}

.copy-btn:hover {
  background: #38BDF8;
  transform: scale(1.04);
}

.copy-btn.copied {
  background: #16A34A;
}

.tier-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1.5rem;
  background: rgba(7, 89, 133, 0.25);
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid rgba(56, 189, 248, 0.2);
}

.tier-table th,
.tier-table td {
  padding: 0.85rem 1rem;
  text-align: left;
  border-bottom: 1px solid rgba(56, 189, 248, 0.12);
  font-size: 0.92rem;
}

.tier-table th {
  background: linear-gradient(90deg, var(--secondary), var(--ice-deep));
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.04em;
}

.tier-table tr:hover td {
  background: rgba(56, 189, 248, 0.08);
  color: #FFFFFF;
}

.tier-table .tier-num {
  color: var(--accent);
  font-weight: 700;
}

.tier-table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: 12px;
}

.guide-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 2.5rem;
  align-items: start;
}

@media (max-width: 767px) {
  .guide-layout {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

.guide-toc {
  position: sticky;
  top: 90px;
  padding: 1.5rem 1.2rem;
  border-radius: 14px;
  background: rgba(7, 89, 133, 0.3);
  border: 1px solid var(--border-glow);
}

@media (max-width: 767px) {
  .guide-toc {
    position: static;
  }
}

.guide-toc h4 {
  font-size: 0.85rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
  text-transform: uppercase;
}

.guide-toc a {
  display: block;
  padding: 0.55rem 0.7rem;
  border-left: 2px solid transparent;
  color: #CBD5E1;
  font-size: 0.95rem;
  border-radius: 0 6px 6px 0;
  transition: all 0.2s ease;
}

.guide-toc a:hover,
.guide-toc a.active {
  background: rgba(56, 189, 248, 0.12);
  border-left-color: var(--accent);
  color: var(--accent);
}

.guide-block {
  margin-bottom: 2.5rem;
  padding: 1.8rem;
  border-radius: 14px;
  background: rgba(12, 74, 110, 0.25);
  border: 1px solid rgba(56, 189, 248, 0.15);
}

.guide-block h3 {
  font-size: 1.35rem;
  margin-bottom: 1rem;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.guide-block h3 i {
  color: var(--primary);
}

.guide-block p,
.guide-block li {
  color: #CBD5E1;
  margin-bottom: 0.7rem;
  line-height: 1.8;
}

.guide-block ul {
  padding-left: 1.4rem;
}

.guide-block ul li {
  list-style: disc;
  color: #BAE6FD;
}

.article-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.8rem;
}

.article-card {
  display: flex;
  flex-direction: column;
  background: rgba(12, 74, 110, 0.35);
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid rgba(56, 189, 248, 0.2);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.article-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 18px 36px rgba(0, 0, 0, 0.4), 0 0 24px rgba(56, 189, 248, 0.2);
}

.article-card .thumb {
  height: 180px;
  overflow: hidden;
  position: relative;
}

.article-card .thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.article-card:hover .thumb img {
  transform: scale(1.08);
}

.article-card .thumb::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 50%, rgba(8, 47, 73, 0.85) 100%);
}

.article-card .body {
  padding: 1.4rem 1.3rem 1.6rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.article-card .meta {
  font-size: 0.78rem;
  color: var(--accent);
  margin-bottom: 0.6rem;
  letter-spacing: 0.05em;
}

.article-card h3 {
  font-size: 1.18rem;
  margin-bottom: 0.6rem;
  color: var(--text-main);
  line-height: 1.4;
}

.article-card p {
  color: #94A3B8;
  font-size: 0.92rem;
  flex: 1;
  margin-bottom: 1rem;
}

.article-card .more {
  color: #38BDF8;
  font-size: 0.9rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.article-card .more:hover {
  color: var(--accent);
}

.article-hero {
  position: relative;
  padding: 8rem 1.25rem 3rem;
  background:
    radial-gradient(circle at 30% 20%, rgba(56, 189, 248, 0.25), transparent 50%),
    linear-gradient(180deg, var(--bg-dark), var(--secondary));
  text-align: center;
  border-bottom: 1px solid var(--border-glow);
}

.article-hero .crumb {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.9rem;
}

.article-hero .crumb a {
  color: #BAE6FD;
}

.article-hero .crumb a:hover {
  color: var(--accent);
}

.article-hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  margin-bottom: 0.8rem;
  color: var(--text-main);
}

.article-hero .meta {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.article-body {
  max-width: 820px;
  margin: 0 auto;
  padding: 3rem 1.25rem;
}

.article-body h2 {
  font-size: clamp(1.35rem, 3vw, 1.7rem);
  margin: 2rem 0 1rem;
  color: var(--accent);
  position: relative;
  padding-left: 1rem;
}

.article-body h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 70%;
  background: linear-gradient(180deg, var(--primary), var(--accent));
  border-radius: 3px;
}

.article-body p {
  color: #CBD5E1;
  margin-bottom: 1.1rem;
  line-height: 1.85;
}

.article-body ul,
.article-body ol {
  padding-left: 1.6rem;
  margin-bottom: 1.2rem;
}

.article-body ul li,
.article-body ol li {
  color: #CBD5E1;
  list-style: disc;
  margin-bottom: 0.5rem;
  line-height: 1.8;
}

.article-body ol li {
  list-style: decimal;
}

.article-body blockquote {
  margin: 1.5rem 0;
  padding: 1rem 1.2rem;
  border-left: 4px solid var(--accent);
  background: rgba(56, 189, 248, 0.08);
  border-radius: 0 8px 8px 0;
  color: #BAE6FD;
  font-style: italic;
}

.article-body img {
  border-radius: 12px;
  margin: 1.5rem 0;
  border: 1px solid rgba(56, 189, 248, 0.2);
}

.article-body strong {
  color: var(--accent);
}

.article-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(56, 189, 248, 0.18);
}

.article-nav a {
  color: #BAE6FD;
  font-size: 0.95rem;
  padding: 0.6rem 1rem;
  border-radius: 8px;
  background: rgba(7, 89, 133, 0.3);
  border: 1px solid var(--border-glow);
  transition: background 0.2s ease;
}

.article-nav a:hover {
  background: var(--primary);
  color: #FFFFFF;
}

@media (max-width: 480px) {
  .article-nav {
    flex-direction: column;
  }
}

.download-zone {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: center;
}

@media (max-width: 767px) {
  .download-zone {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

.download-platforms {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1.5rem;
}

@media (max-width: 767px) {
  .download-platforms {
    align-items: center;
  }
}

.platform-btn {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding: 1rem 1.5rem;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(7, 89, 133, 0.6), rgba(12, 74, 110, 0.4));
  border: 1px solid var(--border-glow);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  min-width: 280px;
}

.platform-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 28px rgba(2, 132, 199, 0.4), 0 0 18px rgba(56, 189, 248, 0.3);
}

.platform-btn .icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.platform-btn .icon.android {
  color: #A4C639;
}

.platform-btn .icon.ios {
  color: #FFFFFF;
}

.platform-btn .text {
  display: flex;
  flex-direction: column;
}

.platform-btn .text strong {
  font-size: 1.05rem;
  color: var(--text-main);
}

.platform-btn .text small {
  color: var(--text-muted);
  font-size: 0.8rem;
}

.download-qr {
  position: relative;
  display: flex;
  justify-content: center;
}

.qr-frame {
  padding: 1rem;
  background: #FFFFFF;
  border-radius: 18px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.45), 0 0 40px rgba(56, 189, 248, 0.3);
  border: 1px solid rgba(186, 230, 253, 0.3);
}

.qr-frame img {
  width: 220px;
  height: 220px;
  object-fit: contain;
}

.qr-caption {
  text-align: center;
  margin-top: 0.8rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.contact-wall {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.4rem;
}

.contact-card {
  text-align: center;
  padding: 1.6rem 1.2rem;
  border-radius: 16px;
  background: rgba(7, 89, 133, 0.32);
  border: 1px solid rgba(56, 189, 248, 0.22);
  transition: transform 0.3s ease, border-color 0.3s ease;
}

.contact-card:hover {
  transform: translateY(-5px);
  border-color: var(--accent);
}

.contact-card .qr {
  width: 160px;
  height: 160px;
  margin: 0 auto 1rem;
  background: #FFFFFF;
  border-radius: 12px;
  padding: 8px;
  overflow: hidden;
}

.contact-card .qr img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 8px;
}

.contact-card h4 {
  font-size: 1.05rem;
  margin-bottom: 0.4rem;
  color: var(--accent);
}

.contact-card p {
  color: #CBD5E1;
  font-size: 0.85rem;
}

.contact-bot {
  margin-top: 2rem;
  text-align: center;
  padding: 1.6rem;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(7, 89, 133, 0.45), rgba(12, 74, 110, 0.3));
  border: 1px solid var(--accent);
}

.contact-bot h4 {
  color: var(--accent);
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
}

.contact-bot a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.6rem;
  padding: 0.7rem 1.4rem;
  border-radius: 10px;
  background: linear-gradient(135deg, #16A34A, #22C55E);
  color: #FFFFFF;
  font-weight: 700;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.contact-bot a:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 22px rgba(34, 197, 94, 0.4);
}

.site-footer {
  position: relative;
  padding: 3rem 1.25rem 1.5rem;
  background: linear-gradient(180deg, var(--bg-dark) 0%, #042235 100%);
  border-top: 1px solid var(--border-glow);
}

.footer-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

@media (max-width: 767px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

.footer-brand .logo {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.6rem;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.9rem;
  max-width: 320px;
}

.footer-col h5 {
  font-size: 0.95rem;
  color: var(--accent);
  margin-bottom: 0.9rem;
}

.footer-col ul li {
  margin-bottom: 0.5rem;
}

.footer-col ul li a {
  color: #94A3B8;
  font-size: 0.88rem;
  transition: color 0.2s ease;
}

.footer-col ul li a:hover {
  color: var(--accent);
}

.friend-links {
  max-width: 1200px;
  margin: 0 auto 1.5rem;
  padding: 1.5rem 0 0;
  border-top: 1px dashed rgba(56, 189, 248, 0.18);
}

.friend-links h6 {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.8rem;
  letter-spacing: 0.05em;
}

.friend-links .links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem 1.2rem;
}

.friend-links .links a {
  color: #64748B;
  font-size: 0.84rem;
  transition: color 0.2s ease;
}

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

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(56, 189, 248, 0.1);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.82rem;
}

.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  padding: 0.7rem 1.4rem;
  border-radius: 999px;
  background: rgba(7, 89, 133, 0.95);
  color: #FFFFFF;
  font-size: 0.9rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  opacity: 0;
  transition: opacity 0.3s ease, transform 0.3s ease;
  z-index: 200;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.snow-particles {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.snow-particles span {
  position: absolute;
  top: -10px;
  color: rgba(255, 255, 255, 0.6);
  border-radius: 50%;
  background: #FFFFFF;
  animation: snowFall linear infinite;
}

@keyframes snowFall {
  0% {
    transform: translateY(-10px) translateX(0);
    opacity: 0;
  }
  10% { opacity: 1; }
  100% {
    transform: translateY(100vh) translateX(40px);
    opacity: 0;
  }
}

.fade-up {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

.bg-section-title {
  position: relative;
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 900;
  color: rgba(56, 189, 248, 0.08);
  position: absolute;
  top: -10px;
  left: 0;
  pointer-events: none;
  z-index: 0;
}

.section-head {
  position: relative;
  margin-bottom: 2.5rem;
  z-index: 1;
}

.hex-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.hex-card {
  padding: 1.8rem 1.4rem;
  background: linear-gradient(135deg, rgba(2, 132, 199, 0.18), rgba(7, 89, 133, 0.4));
  border: 1px solid var(--border-glow);
  border-radius: 18px 4px 18px 4px;
  transition: transform 0.3s ease, border-radius 0.3s ease;
}

.hex-card:hover {
  transform: rotate(-1deg) scale(1.02);
  border-radius: 4px 18px 4px 18px;
  border-color: var(--accent);
}

.hex-card .num {
  font-size: 2.4rem;
  font-weight: 900;
  color: var(--accent);
  font-family: "Georgia", serif;
  margin-bottom: 0.5rem;
  line-height: 1;
}

.hex-card h4 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

.hex-card p {
  color: #94A3B8;
  font-size: 0.9rem;
}

.tags-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1rem;
}

.tags-cloud span {
  padding: 0.3rem 0.85rem;
  border-radius: 999px;
  background: rgba(56, 189, 248, 0.12);
  color: #BAE6FD;
  font-size: 0.82rem;
  border: 1px solid var(--border-glow);
}

.scroll-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), #38BDF8);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  box-shadow: 0 8px 22px rgba(2, 132, 199, 0.5);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
  z-index: 90;
}

.scroll-top.show {
  opacity: 1;
  pointer-events: auto;
}

.scroll-top:hover {
  transform: translateY(-3px);
}