:root {
  --primary: #4f46e5;       
  --primary-light: #e0e7ff;
  --primary-dark: #4338ca;
  --download: #10b981;     
  --download-dark: #059669;
  --bg: #f8fafc;      
  --card: #ffffff;
  --text: #0f172a;      
  --muted: #64748b;     
  --border: #f1f5f9;      
  --border-hover: #cbd5e1;
  --soft: #f8fafc;
  --yellow: #f59e0b;
  --danger: #ef4444;
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 10px 25px -5px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 20px 40px -15px rgba(15, 23, 42, 0.12);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

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

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

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto !important;
  padding: 0 24px;
}

.site-header {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(241, 245, 249, 0.8);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.topbar {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 22px;
  font-weight: 800;
  color: var(--text);
}

.logo-mark {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--primary), #818cf8);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 900;
  font-size: 20px;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

.nav {
  display: flex;
  align-items: center;
  gap: 24px;
  font-weight: 600;
  font-size: 15px;
  color: var(--muted);
}

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

.header-search {
  max-width: 280px;
  flex: 1;
}

.header-search input {
  width: 100%;
  padding: 10px 18px;
  border: 1px solid var(--border-hover);
  border-radius: 999px;
  background: var(--bg);
  outline: none;
  font-size: 14px;
  transition: var(--transition);
}

.header-search input:focus {
  border-color: var(--primary);
  background: #fff;
  box-shadow: 0 0 0 4px var(--primary-light);
}

.hero {
  position: relative;
  background: radial-gradient(circle at 10% 20%, rgba(99, 102, 241, 0.15) 0%, transparent 40%),
              radial-gradient(circle at 90% 80%, rgba(16, 185, 129, 0.1) 0%, transparent 50%),
              #ffffff;
  border-bottom: 1px solid var(--border);
  padding: 80px 0;
  overflow: hidden;
}

.hero-inner {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.hero h1 {
  margin: 0 0 16px;
  font-size: clamp(28px, 4.5vw, 48px);
  font-weight: 800;
  color: var(--text);
  letter-spacing: -1px;
  line-height: 1.2;
}

.hero p {
  margin: 0 auto 32px;
  color: var(--muted);
  font-size: clamp(15px, 2vw, 18px);
  line-height: 1.6;
}

.searchbox {
  display: flex;
  gap: 10px;
  background: #fff;
  border-radius: var(--radius-md);
  padding: 6px;
  border: 1px solid var(--border-hover);
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

.searchbox:focus-within {
  border-color: var(--primary);
  box-shadow: var(--shadow-lg), 0 0 0 4px var(--primary-light);
}

.searchbox input {
  flex: 1;
  border: 0;
  background: transparent;
  padding: 14px 18px;
  font-size: 16px;
  outline: none;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  align-items: center;
  margin-top: 24px;
  color: var(--muted);
  font-size: 13px;
}

.chips a {
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--bg);
  border: 1px solid var(--border);
  font-weight: 500;
}

.chips a:hover {
  background: var(--primary-light);
  color: var(--primary);
  border-color: transparent;
}

.section {
  margin: 40px 0;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
}

.section-title {
  margin: 0;
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.page-title {
  margin: 0 0 12px;
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -1px;
}

.view-more {
  color: var(--primary);
  font-weight: 700;
  font-size: 14px;
}

.view-more:hover {
  color: var(--primary-dark);
  text-decoration: underline;
}

.content-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 32px;
  align-items: start;
}

.main-content,
.sidebar {
  display: grid;
  gap: 32px;
}
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 16px;
}

.category {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px 16px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.category:hover {
  transform: translateY(-4px);
  border-color: var(--primary-light);
  box-shadow: var(--shadow-md);
}

.cat-icon {
  width: 52px;
  height: 52px;
  margin: 0 auto 12px;
  border-radius: var(--radius-sm);
  background: var(--primary-light);
  color: var(--primary);
  display: grid;
  place-items: center;
  font-size: 24px;
}

.category strong {
  display: block;
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 4px;
}

.category span {
  color: var(--muted);
  font-size: 12px;
}


.app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

.app-card {
  display: flex;
  gap: 16px;
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--card);
  transition: var(--transition);
  position: relative;
}

.app-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary-light);
  box-shadow: var(--shadow-md);
}

.app-icon {
  width: 76px;
  height: 76px;
  min-width: 76px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #f1f5f9, #e2e8f0);
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.03);
  overflow: hidden;
}

.app-body {
  min-width: 0;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.app-body h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.3;
}

.app-meta {
  color: var(--muted);
  font-size: 12px;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.app-desc {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.app-action {
  font-size: 13px;
  font-weight: 700;
  color: var(--primary);
  margin-top: auto;
  align-self: flex-start;
}

.feature-box {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 32px;
  align-items: center;
  background: linear-gradient(135deg, #fff 40%, var(--primary-light) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
}

.feature-visual {
  min-height: 240px;
  border-radius: var(--radius-md);
  background: radial-gradient(circle at 10% 20%, rgba(16, 185, 129, 0.1) 0%, transparent 60%), #ffffff;
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
}

.big-icon {
  width: 110px;
  height: 110px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.rank-list {
  display: grid;
  gap: 16px;
}

.rank-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.rank-item:hover {
  background: var(--bg);
}

.rank-num {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--border);
  color: var(--text);
  font-size: 13px;
  font-weight: 800;
  display: grid;
  place-items: center;
}

.rank-item:nth-child(1) .rank-num { background: #fef3c7; color: #b45309; }
.rank-item:nth-child(2) .rank-num { background: #e0e7ff; color: #4338ca; }
.rank-item:nth-child(3) .rank-num { background: #d1fae5; color: #047857; }

.rank-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
}

.rank-text strong {
  display: block;
  font-size: 14px;
  font-weight: 700;
}

.rank-text span {
  font-size: 12px;
  color: var(--muted);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  padding: 14px 24px;
  font-weight: 700;
  font-size: 15px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition);
}

.btn-download {
  background: var(--download);
  color: #fff;
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.3);
}

.btn-download:hover {
  background: var(--download-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
}

.btn-download:active,
.btn-primary:active {
  transform: translateY(0);
}

.btn-outline {
  background: #fff;
  border-color: var(--border-hover);
  color: var(--text);
}

.btn-outline:hover {
  background: var(--bg);
  border-color: var(--muted);
}

.breadcrumb {
  padding: 24px 0 12px;
  font-size: 13px;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.detail-hero {
  display: flex;
  gap: 28px;
  align-items: center;
}

.detail-icon {
  width: 110px;
  height: 110px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.detail-title {
  margin: 0 0 8px;
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 800;
  letter-spacing: -0.5px;
}


.spec-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
}

.spec-table tr {
  border-bottom: 1px solid var(--border);
}

.spec-table tr:last-child {
  border-bottom: 0;
}

.spec-table td {
  padding: 14px 8px;
  font-size: 14px;
}

.spec-table td:first-child {
  color: var(--muted);
  width: 35%;
}

.spec-table td:last-child {
  font-weight: 600;
  color: var(--text);
}


details {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  padding: 16px;
  background: var(--soft);
  transition: var(--transition);
}

details[open] {
  background: #fff;
  border-color: var(--primary-light);
}

summary {
  font-weight: 700;
  cursor: pointer;
  outline: none;
  font-size: 15px;
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.article {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.article:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.article-thumb {
  height: 140px;
  background: linear-gradient(135deg, var(--primary-light) 0%, #e0f2fe 100%);
  display: grid;
  place-items: center;
  font-size: 42px;
}

.article-body {
  padding: 20px;
}

.article-body h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
}

.article-body p {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
  margin: 0;
}

.notice {
  background: rgba(254, 243, 199, 0.4);
  border: 1px dashed #f59e0b;
  color: #92400e;
  border-radius: var(--radius-sm);
  padding: 18px;
  font-size: 14px;
}

.site-footer {
  margin-top: 60px;
  background: #fff;
  border-top: 1px solid var(--border);
  padding: 50px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 32px;
  margin-bottom: 40px;
}

.footer-logo {
  font-size: 24px;
  font-weight: 900;
  color: var(--primary);
  margin-bottom: 12px;
}

.footer-col h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
  margin: 0 0 16px;
}

.footer-col a {
  display: block;
  margin-bottom: 10px;
  font-size: 14px;
  color: var(--muted);
}

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

.copyright {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  text-align: center;
  font-size: 13px;
  color: var(--muted);
}

@media (max-width: 1024px) {
  .content-grid {
    grid-template-columns: 1fr;
  }

  .sidebar {
    margin-top: 16px;
  }

  .feature-box {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .feature-visual {
    max-width: 320px;
    margin: 0 auto;
  }

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

@media (max-width: 768px) {
  .topbar {
    height: auto;
    padding: 16px 0;
    flex-wrap: wrap;
    gap: 16px;
  }

  .nav,
  .header-search {
    display: none;
  }

  .hero {
    padding: 48px 0;
  }

  .hero-inner {
    text-align: left;
  }

  .searchbox {
    flex-direction: column;
    padding: 8px;
  }

  .searchbox button {
    width: 100%;
    padding: 14px;
  }

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

  .detail-hero {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

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

  .card {
    padding: 20px;
  }
}


@media (max-width: 480px) {
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }

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