:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --secondary: #7c3aed;
  --accent: #f59e0b;
  --success: #10b981;
  --dark: #0f172a;
  --dark-light: #1e293b;
  --text: #1e293b;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --bg-card: #ffffff;
  --border: #e2e8f0;
  --border-focus: #3b82f6;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --radius: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --max-width: 1200px;
}

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

body {
  font-family: var(--font-sans);
  color: var(--text);
  background-color: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s;
}

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header & Nav */
.site-header {
  background-color: #ffffff;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: var(--shadow-sm);
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 0;
  gap: 1rem;
}

.brand-area {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-logo {
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
}

.brand-info {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--dark);
  line-height: 1.2;
}

.brand-slogan {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.search-box {
  position: relative;
  display: flex;
  align-items: center;
}

.search-input {
  padding: 0.5rem 1rem 0.5rem 2.25rem;
  font-size: 0.875rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  background-color: var(--bg-alt);
  width: 220px;
  transition: all 0.2s;
}

.search-input:focus {
  outline: none;
  border-color: var(--primary);
  background-color: #ffffff;
  width: 280px;
}

.search-icon {
  position: absolute;
  left: 0.75rem;
  color: var(--text-muted);
  width: 16px;
  height: 16px;
  pointer-events: none;
}

.btn-tg {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background-color: #0088cc;
  color: #ffffff !important;
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-full);
  transition: background-color 0.2s;
}

.btn-tg:hover {
  background-color: #0077b5;
}

.btn-recommend {
  display: inline-flex;
  align-items: center;
  background-color: var(--primary);
  color: #ffffff !important;
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
}

.btn-recommend:hover {
  background-color: var(--primary-hover);
}

.mobile-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  padding: 0.5rem;
  border-radius: var(--radius);
  cursor: pointer;
}

/* Nav Menu */
.header-nav {
  border-top: 1px solid var(--border);
  background-color: var(--bg-alt);
}

.nav-list {
  display: flex;
  list-style: none;
  overflow-x: auto;
  padding: 0.25rem 0;
  white-space: nowrap;
}

.nav-item a {
  display: block;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text);
  border-radius: var(--radius);
  transition: all 0.2s;
}

.nav-item a:hover,
.nav-item a.active {
  color: var(--primary);
  background-color: #ffffff;
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, #f8fafc 0%, #eff6ff 100%);
  padding: 3.5rem 0;
  border-bottom: 1px solid var(--border);
}

.hero-badge {
  display: inline-block;
  background-color: #dbeafe;
  color: var(--primary);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  margin-bottom: 1rem;
}

.hero-title {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--dark);
  line-height: 1.25;
  margin-bottom: 1rem;
}

.hero-description {
  font-size: 1.05rem;
  color: var(--text);
  line-height: 1.7;
  max-width: 900px;
  margin-bottom: 1.5rem;
  background: #ffffff;
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-lg);
  border-left: 4px solid var(--primary);
  box-shadow: var(--shadow-sm);
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  margin-bottom: 1rem;
}

.btn-primary {
  background-color: var(--primary);
  color: #ffffff !important;
  font-weight: 600;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-primary:hover {
  background-color: var(--primary-hover);
}

.btn-secondary {
  background-color: #ffffff;
  color: var(--dark) !important;
  border: 1px solid var(--border);
  font-weight: 600;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
}

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

.hero-disclosure {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Section Common */
.section {
  padding: 3rem 0;
}

.section-alt {
  background-color: var(--bg-alt);
}

.section-header {
  margin-bottom: 2rem;
  text-align: left;
}

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 0.5rem;
}

.section-subtitle {
  font-size: 0.95rem;
  color: var(--text-muted);
}

/* 4 Core Featured Providers Grid */
.core-providers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.provider-card {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: var(--shadow-sm);
}

.provider-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.provider-card.primary-rank-1 {
  border: 2px solid var(--primary);
  background: linear-gradient(180deg, #ffffff 0%, #f0f7ff 100%);
}

.card-badge {
  position: absolute;
  top: 1rem;
  right: 1rem;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  background-color: var(--bg-alt);
  color: var(--text);
  border: 1px solid var(--border);
}

.provider-card.primary-rank-1 .card-badge {
  background-color: #ef4444;
  color: #ffffff;
  border: none;
}

.card-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 0.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.card-price {
  font-size: 1.25rem;
  font-weight: 800;
  color: #dc2626;
  margin-bottom: 0.75rem;
}

.card-traffic {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: normal;
}

.card-point {
  font-size: 0.875rem;
  color: var(--text);
  margin-bottom: 1rem;
  flex-grow: 1;
  line-height: 1.5;
}

.card-features {
  list-style: none;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  border-top: 1px dashed var(--border);
  padding-top: 0.75rem;
}

.card-features li {
  margin-bottom: 0.35rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.card-coupon {
  background-color: #fef3c7;
  border: 1px dashed #f59e0b;
  border-radius: var(--radius);
  padding: 0.5rem 0.75rem;
  font-size: 0.8rem;
  margin-bottom: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.btn-copy {
  background: #d97706;
  color: #fff;
  border: none;
  font-size: 0.7rem;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  cursor: pointer;
}

.card-actions {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.btn-register {
  display: block;
  text-align: center;
  background-color: #ef4444;
  color: #ffffff !important;
  font-weight: 700;
  font-size: 0.95rem;
  padding: 0.75rem;
  border-radius: var(--radius);
  box-shadow: 0 4px 6px -1px rgb(239 68 68 / 0.3);
  transition: all 0.2s;
}

.btn-register:hover {
  background-color: #dc2626;
  transform: scale(1.02);
}

.btn-detail {
  display: block;
  text-align: center;
  background-color: var(--bg-alt);
  color: var(--text) !important;
  border: 1px solid var(--border);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.5rem;
  border-radius: var(--radius);
}

.btn-detail:hover {
  background-color: #ffffff;
  border-color: var(--primary);
  color: var(--primary) !important;
}

/* Comparison Table */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: #ffffff;
  box-shadow: var(--shadow-sm);
  margin-bottom: 2rem;
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.875rem;
}

.comparison-table th,
.comparison-table td {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
}

.comparison-table th {
  background-color: var(--bg-alt);
  font-weight: 700;
  color: var(--dark);
  white-space: nowrap;
}

.comparison-table tr:hover {
  background-color: #f8fafc;
}

/* FAQ Accordion (Always Open per prompt) */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow-sm);
}

.faq-question {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.faq-question::before {
  content: "Q";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background-color: var(--primary);
  color: #fff;
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 700;
}

.faq-answer {
  font-size: 0.925rem;
  color: var(--text);
  line-height: 1.7;
  padding-left: 2rem;
  border-left: 2px solid var(--border);
}

/* Article & Content Layout */
.content-wrapper {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 2rem;
  padding: 2.5rem 0;
}

.article-main {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
}

.article-header {
  border-bottom: 1px solid var(--border);
  padding-bottom: 1.5rem;
  margin-bottom: 1.5rem;
}

.article-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--dark);
  line-height: 1.3;
  margin-bottom: 0.75rem;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.article-body {
  font-size: 1.05rem;
  line-height: 1.8;
  color: #334155;
}

.article-body h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--dark);
  margin: 2rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.article-body h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--dark);
  margin: 1.5rem 0 0.75rem;
}

.article-body p {
  margin-bottom: 1.25rem;
}

.article-body ul,
.article-body ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
}

.article-body li {
  margin-bottom: 0.5rem;
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.sidebar-widget {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
}

.widget-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.5rem;
}

/* Footer */
.site-footer {
  background-color: var(--dark);
  color: #94a3b8;
  padding: 3.5rem 0 2rem;
  border-top: 1px solid var(--dark-light);
  font-size: 0.875rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}

.footer-brand h3 {
  color: #ffffff;
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

.footer-keyword-text {
  line-height: 1.7;
  color: #cbd5e1;
  margin-bottom: 1rem;
}

.footer-disclosure {
  font-size: 0.8rem;
  color: #64748b;
  line-height: 1.6;
}

.footer-col h4 {
  color: #ffffff;
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.6rem;
}

.footer-links a {
  color: #94a3b8;
}

.footer-links a:hover {
  color: #ffffff;
}

.footer-bottom {
  border-top: 1px solid var(--dark-light);
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.8rem;
}

/* Responsive */
@media (max-width: 992px) {
  .content-wrapper {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .header-actions .search-box {
    display: none;
  }
  .mobile-toggle {
    display: block;
  }
  .header-nav {
    display: none;
  }
  .header-nav.is-open {
    display: block;
  }
  .nav-list {
    flex-direction: column;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .hero-title {
    font-size: 1.75rem;
  }
}