:root {
  --color-bg: #0b0d12;
  --color-surface: #141822;
  --color-surface-2: #1b202c;
  --color-border: #262c3a;
  --color-text: #eef1f7;
  --color-text-muted: #9aa3b5;
  --color-accent: #ff5a36;
  --color-accent-strong: #ff7a52;
  --color-accent-soft: rgba(255, 90, 54, 0.12);
  --radius-md: 12px;
  --radius-lg: 18px;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---- 顶部导航 ---- */
.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  border-bottom: 1px solid var(--color-border);
  background: rgba(11, 13, 18, 0.9);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(8px);
}

.site-nav .brand {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.3px;
}

.site-nav .brand span {
  color: var(--color-accent);
}

.site-nav .nav-links {
  display: flex;
  gap: 28px;
  font-size: 14px;
  color: var(--color-text-muted);
}

.site-nav .nav-links a:hover {
  color: var(--color-text);
}

/* ---- Hero ---- */
.hero {
  padding: 88px 24px 64px;
  text-align: center;
}

.hero h1 {
  font-size: 42px;
  font-weight: 800;
  margin: 0 0 18px;
  letter-spacing: -0.5px;
}

.hero p.lead {
  font-size: 17px;
  color: var(--color-text-muted);
  max-width: 560px;
  margin: 0 auto 32px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: transform 0.15s ease, opacity 0.15s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-strong));
  color: #fff;
}

.btn-secondary {
  background: var(--color-surface-2);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-block {
  width: 100%;
}

/* ---- 功能卡片 ---- */
.section {
  padding: 56px 24px;
}

.section-title {
  font-size: 26px;
  font-weight: 700;
  text-align: center;
  margin: 0 0 8px;
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-muted);
  margin: 0 0 40px;
  font-size: 15px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
}

.feature-card .icon {
  font-size: 26px;
  margin-bottom: 12px;
}

.feature-card h3 {
  margin: 0 0 8px;
  font-size: 16px;
}

.feature-card p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 13.5px;
}

.scenario-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.scenario-chip {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 8px 18px;
  font-size: 13.5px;
  color: var(--color-text-muted);
}

/* ---- 定价卡片 ---- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
}

.price-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.price-card.featured {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 1px var(--color-accent), 0 20px 40px -20px var(--color-accent-soft);
}

.price-card .badge {
  align-self: flex-start;
  background: var(--color-accent-soft);
  color: var(--color-accent-strong);
  font-size: 12px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 999px;
}

.price-card h3 {
  margin: 0;
  font-size: 18px;
}

.price-card .price {
  font-size: 34px;
  font-weight: 800;
}

.price-card .price small {
  font-size: 14px;
  font-weight: 400;
  color: var(--color-text-muted);
}

.price-card .meta {
  font-size: 13.5px;
  color: var(--color-text-muted);
}

/* ---- 商品详情页 ---- */
.product-detail {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: start;
}

@media (max-width: 760px) {
  .product-detail {
    grid-template-columns: 1fr;
  }
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
}

.spec-table td {
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 14px;
}

.spec-table td:first-child {
  color: var(--color-text-muted);
  width: 140px;
}

.panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.note-box {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  font-size: 13px;
  color: var(--color-text-muted);
  margin-top: 16px;
}

/* ---- 结账页 ---- */
.checkout-wrap {
  max-width: 460px;
  margin: 60px auto;
}

.order-summary-row {
  display: flex;
  justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 14.5px;
}

.order-summary-row:last-of-type {
  border-bottom: none;
}

.order-summary-row.total {
  font-size: 18px;
  font-weight: 700;
  padding-top: 18px;
}

.order-summary-row .label {
  color: var(--color-text-muted);
}

.pay-method-row {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  margin: 18px 0;
  font-size: 14px;
}

.alert-error {
  background: rgba(255, 70, 70, 0.12);
  border: 1px solid rgba(255, 70, 70, 0.4);
  color: #ff8c8c;
  border-radius: var(--radius-md);
  padding: 12px 16px;
  font-size: 13.5px;
  margin-bottom: 16px;
}

/* ---- 页脚 ---- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 32px 24px;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 12.5px;
}

.site-footer p {
  margin: 4px 0;
}