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

:root {
  --bg: #f8f9fb;
  --card: #ffffff;
  --border: #e4e7ec;
  --text: #111827;
  --text-muted: #6b7280;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-fg: #ffffff;
  --amber-bg: #fffbeb;
  --amber-border: #fde68a;
  --amber-text: #92400e;
  --amber-text-light: #b45309;
  --emerald: #10b981;
  --blue: #3b82f6;
  --violet: #8b5cf6;
  --amber-icon: #f59e0b;
  --muted-bg: #f3f4f6;
  --ring: #2563eb;
  --radius: 12px;
  --radius-sm: 8px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Header */
.header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
}

.header-inner {
  max-width: 1152px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-icon {
  width: 36px;
  height: 36px;
  background: var(--primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-fg);
}

.header-title {
  font-size: 18px;
  font-weight: 600;
}

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

.header-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text);
  background: var(--card);
}

.header-badge svg {
  color: var(--amber-icon);
}

/* Main */
.main {
  max-width: 1152px;
  margin: 0 auto;
  padding: 5px;
}

/* Banner */
.banner {
  background: var(--amber-bg);
  border: 1px solid var(--amber-border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 32px;
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.banner svg {
  color: var(--amber-text-light);
  flex-shrink: 0;
  margin-top: 2px;
}

.banner-title {
  font-weight: 600;
  font-size: 14px;
  color: var(--amber-text);
}

.banner-text {
  font-size: 13px;
  color: var(--amber-text-light);
  margin-top: 4px;
}

/* Tabs */
.tabs-list {
  display: flex;
  gap: 4px;
  background: var(--muted-bg);
  border-radius: var(--radius-sm);
  padding: 4px;
  margin-bottom: 24px;
  overflow-x: auto;
}

.tab-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: none;
  background: transparent;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

.tab-btn:hover {
  color: var(--text);
}

.tab-btn.active {
  background: var(--card);
  color: var(--text);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.tab-btn svg {
  width: 16px;
  height: 16px;
}

.tab-label {
  display: none;
}

@media (min-width: 640px) {
  .tab-label {
    display: inline;
  }
}

/* Tab Content */
.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* Card */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.card-header {
  padding: 20px 24px 0;
}

.card-content {
  padding: 16px 24px 20px;
}

.card-footer {
  padding: 0 24px 20px;
  text-align: center;
}

/* Category Card */
.cat-card {
  margin-bottom: 24px;
}

.cat-title-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
}

.cat-title-row svg {
  color: var(--primary);
}

.cat-title {
  font-size: 18px;
  font-weight: 600;
}

.cat-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 16px;
}

.cat-detail {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  margin-bottom: 8px;
}

.cat-detail svg {
  color: var(--emerald);
  flex-shrink: 0;
}

.cat-notice {
  margin-top: 16px;
  background: var(--muted-bg);
  border-radius: var(--radius-sm);
  padding: 12px;
  font-size: 12px;
  color: var(--text-muted);
}

.cat-notice strong {
  font-weight: 600;
}

/* Plans Grid */
.plans-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 16px;
}

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

@media (min-width: 640px) {
  .plans-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Plan Card */
.plan-card {
  position: relative;
  background: var(--card);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.2s;
  overflow: visible;
}

.plan-card:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  border-color: rgba(37, 99, 235, 0.3);
}

.plan-card.selected {
  border-color: var(--ring);
  box-shadow: 0 0 0 1px var(--ring);
}

.plan-popular-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: var(--primary);
  color: var(--primary-fg);
  font-size: 11px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 999px;
  white-space: nowrap;
}

.plan-popular-badge svg {
  width: 12px;
  height: 12px;
}

.plan-header {
  padding: 24px 20px 0;
  text-align: center;
}

.plan-name {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.plan-price {
  font-size: 30px;
  font-weight: 700;
}

.plan-period {
  font-size: 13px;
  color: var(--text-muted);
}

.plan-features {
  padding: 16px 20px;
}

.plan-feature {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 13px;
  margin-bottom: 10px;
}

.plan-feature svg {
  margin-top: 2px;
  color: var(--emerald);
  flex-shrink: 0;
}

.plan-footer {
  padding: 0 20px 20px;
  text-align: center;
}

.plan-selected-badge {
  display: inline-flex;
  padding: 4px 12px;
  background: var(--primary);
  color: var(--primary-fg);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
}

.plan-click-text {
  font-size: 13px;
  color: var(--text-muted);
}

/* Purchase Button */
.purchase-area {
  margin-top: 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.purchase-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 48px;
  padding: 0 32px;
  background: var(--primary);
  color: var(--primary-fg);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

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

.purchase-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.purchase-btn.success {
  background: var(--emerald);
}

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

/* Trust Grid */
.trust-grid {
  margin-top: 40px;
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .trust-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.trust-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px;
  background: var(--card);
}

.trust-item svg {
  flex-shrink: 0;
  margin-top: 2px;
}

.trust-title {
  font-size: 13px;
  font-weight: 600;
}

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

/* FAQ */
.faq-section {
  margin-top: 48px;
  border-top: 1px solid var(--border);
  padding-top: 32px;
}

.faq-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 24px;
}

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

@media (min-width: 640px) {
  .faq-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.faq-card .card-header {
  padding-bottom: 0;
}

.faq-q {
  font-size: 13px;
  font-weight: 600;
}

.faq-a {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Footer Contact */
.contact-footer {
  margin-top: 32px;
  padding-bottom: 32px;
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.contact-footer a {
  color: var(--primary);
  font-weight: 500;
  text-decoration: underline;
}

/* SVG icon sizing */
svg.icon-sm {
  width: 16px;
  height: 16px;
}

svg.icon-md {
  width: 20px;
  height: 20px;
}

svg.icon-xs {
  width: 12px;
  height: 12px;
}