/* =========================================
 * 跨境合规通 — 主样式（首页 + 关于页共用）
 * 颜色全部走 theme.css 的 CSS 变量
 * ========================================= */

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

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-page);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
               "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
               Roboto, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.25s ease, color 0.25s ease;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
img, svg { display: block; max-width: 100%; }

/* =========================================
 * 顶部导航栏
 * ========================================= */
.site-header {
  width: 100%;
  height: 64px;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background-color 0.25s ease, border-color 0.25s ease;
}

.header-inner {
  max-width: 1100px;
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.logo-icon {
  width: 32px;
  height: 32px;
  background: var(--brand);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-inverse);
  font-weight: bold;
  font-size: 16px;
}

.logo-text { display: flex; flex-direction: column; line-height: 1.2; }
.logo-title { font-size: 16px; font-weight: 800; color: var(--text-primary); }
.logo-domain { font-size: 11px; color: var(--text-muted); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-item a {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

.nav-item a:hover { color: var(--brand); }
.nav-item.active a { color: var(--brand); font-weight: 700; }

/* 主题切换按钮 */
.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  background: var(--bg-muted);
  transition: background-color 0.2s, color 0.2s, transform 0.2s;
}

.theme-toggle:hover {
  background: var(--brand-soft);
  color: var(--brand);
}

.theme-toggle:active { transform: scale(0.92); }

.theme-toggle .icon-sun  { display: none; }
.theme-toggle .icon-moon { display: block; }
[data-theme="dark"] .theme-toggle .icon-sun  { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

/* =========================================
 * Hero 区 — 标题、副标题、徽章、5 卡片、CTA
 * ========================================= */
.hero {
  padding: 64px 24px 48px;
  text-align: center;
}

.hero-badges {
  display: inline-flex;
  align-items: center;
  gap: 28px;
  padding: 10px 22px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 999px;
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 28px;
  box-shadow: var(--shadow-sm);
  transition: background-color 0.25s, border-color 0.25s;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  letter-spacing: 0.5px;
}

.hero-badge-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: currentColor;
}

/* 颜色变体：通过 color 让 .dot 和文字同色 */
.hero-badge--green  { color: var(--badge-green);  }
.hero-badge--blue   { color: var(--badge-blue);   }
.hero-badge--purple { color: var(--badge-purple); }

/* 第二/三个徽章用 SVG 图标 */
.hero-badge-icon {
  width: 18px;
  height: 18px;
  fill: currentColor;
  flex-shrink: 0;
}

.hero-title {
  font-size: 38px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 18px;
  letter-spacing: -0.5px;
}

.hero-title .accent {
  background: linear-gradient(120deg, var(--grad-cta-start), var(--grad-cta-end));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-subtitle {
  font-size: 15px;
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 auto 36px;
  line-height: 1.8;
}

/* ========== 五张扇形卡片 (源自 kapian.html) ========== */
.card-container {
  position: relative;
  width: 100%;
  max-width: 750px;
  height: 420px;
  margin: 0 auto 40px;
  display: flex;
  justify-content: center;
  align-items: flex-end;
  padding-bottom: 20px;
}

.document-card {
  position: absolute;
  width: 230px;
  height: 320px;
  background: var(--card-bg);
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  padding: 18px;
  cursor: pointer;
  transform-origin: bottom center;
  transition: all 0.4s cubic-bezier(0.25, 1, 0.5, 1),
              background-color 0.25s ease;
  user-select: none;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.card-tag {
  font-size: 11px;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 4px;
}

.card-title { font-size: 17px; font-weight: 700; margin-top: 4px; }
.card-sub {
  font-size: 10px;
  color: var(--text-faint);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 12px;
}

.card-content {
  background: var(--card-skel-bg);
  border-radius: 6px;
  padding: 10px;
  font-size: 11px;
  color: var(--text-secondary);
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: background-color 0.25s ease;
}

.field-row {
  display: flex;
  justify-content: space-between;
  border-bottom: 1px dashed var(--card-skel-line);
  padding-bottom: 4px;
  transition: border-color 0.25s ease;
}
.field-label { color: var(--text-muted); font-size: 10px; }
.field-val   { font-weight: 600; color: var(--text-primary); }

/* 五卡主题 — 通过 CSS 变量切换 */
.theme-customs  { border: 1.5px solid var(--theme-customs-border); }
.theme-customs  .card-tag  { background: var(--theme-customs-tag); color: var(--theme-customs-text); }
.theme-customs  .card-title { color: var(--theme-customs-text); }

.theme-contract { border: 1.5px solid var(--theme-contract-border); }
.theme-contract .card-tag  { background: var(--theme-contract-tag); color: var(--theme-contract-text); }
.theme-contract .card-title { color: var(--theme-contract-text); }

.theme-invoice  { border: 1.5px solid var(--theme-invoice-border); }
.theme-invoice  .card-tag  { background: var(--theme-invoice-tag); color: var(--theme-invoice-text); }
.theme-invoice  .card-title { color: var(--theme-invoice-text); }

.theme-proforma { border: 1.5px solid var(--theme-proforma-border); }
.theme-proforma .card-tag  { background: var(--theme-proforma-tag); color: var(--theme-proforma-text); }
.theme-proforma .card-title { color: var(--theme-proforma-text); }

.theme-packing  { border: 1.5px solid var(--theme-packing-border); }
.theme-packing  .card-tag  { background: var(--theme-packing-tag); color: var(--theme-packing-text); }
.theme-packing  .card-title { color: var(--theme-packing-text); }

/* 扇形排布 */
.card-1 { transform: rotate(-24deg) translateX(-180px); z-index: 1; }
.card-2 { transform: rotate(-12deg) translateX(-90px);  z-index: 2; }
.card-3 { transform: rotate(0deg)                          z-index: 3; }
.card-4 { transform: rotate(12deg)  translateX(90px);   z-index: 4; }
.card-5 { transform: rotate(24deg)  translateX(180px);  z-index: 5; }

/* hover 展开 */
.card-container:hover .document-card { opacity: 0.35; }
.card-container .document-card:hover {
  opacity: 1;
  transform: rotate(0deg) translateY(-50px) scale(1.15);
  z-index: 10 !important;
  box-shadow: var(--shadow-xl);
}

/* ========== Hero CTA 按钮 ========== */
.cta-start {
  display: inline-block;
  padding: 16px 42px;
  font-size: 17px;
  font-weight: 700;
  color: #ffffff;
  background: linear-gradient(135deg, var(--grad-cta-start), var(--grad-cta-end));
  border-radius: 999px;
  box-shadow: 0 8px 20px rgba(139, 92, 246, 0.35);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  text-decoration: none;
}

.cta-start:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(139, 92, 246, 0.45);
}

.cta-start:active { transform: translateY(0); }

/* =========================================
 * 4 个特色卡片
 * ========================================= */
.features {
  padding: 48px 24px 64px;
  max-width: 1100px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.feature-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 22px 18px;
  text-align: center;
  transition: transform 0.25s ease, box-shadow 0.25s ease,
              background-color 0.25s ease, border-color 0.25s ease;
}

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

.feature-icon {
  width: 40px;
  height: 40px;
  margin: 0 auto 12px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}

.feature-card[data-color="purple"] .feature-icon { background: var(--brand-soft); color: var(--brand); }
.feature-card[data-color="green"]  .feature-icon { background: #ecfdf5; color: #047857; }
.feature-card[data-color="blue"]   .feature-icon { background: #eff6ff; color: #1d4ed8; }
.feature-card[data-color="orange"] .feature-icon { background: #fff7ed; color: #c2410c; }

[data-theme="dark"] .feature-card[data-color="green"] .feature-icon { background: #0f3d2e; color: #6ee7b7; }
[data-theme="dark"] .feature-card[data-color="blue"]  .feature-icon { background: #1e3a5f; color: #93c5fd; }
[data-theme="dark"] .feature-card[data-color="orange"].feature-icon,
[data-theme="dark"] .feature-card[data-color="orange"] .feature-icon { background: #4a2410; color: #fdba74; }

.feature-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.feature-desc {
  font-size: 12.5px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* =========================================
 * FAQ
 * ========================================= */
.faq {
  padding: 64px 24px 72px;
  max-width: 720px;
  margin: 0 auto;
}

.faq-title {
  text-align: center;
  font-size: 26px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 32px;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  overflow: hidden;
  transition: border-color 0.25s ease, background-color 0.25s ease;
}

.faq-item.open {
  border-color: var(--brand);
}

.faq-question {
  width: 100%;
  padding: 16px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--text-primary);
  text-align: left;
  transition: background-color 0.2s ease;
}

.faq-question:hover { background: var(--bg-muted); }

.faq-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: var(--text-muted);
  transition: transform 0.3s ease, color 0.3s ease;
}

.faq-item.open .faq-icon {
  transform: rotate(180deg);
  color: var(--brand);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}

.faq-answer-inner {
  padding: 0 20px 18px;
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.8;
  border-top: 1px dashed var(--border-dashed);
  padding-top: 14px;
}

/* =========================================
 * CTA Banner
 * ========================================= */
.cta-banner-section {
  padding: 24px;
}

.cta-banner {
  max-width: 1000px;
  margin: 0 auto;
  padding: 50px 24px;
  text-align: center;
  background: linear-gradient(135deg, var(--grad-cta-start), var(--grad-cta-mid), var(--grad-cta-end));
  border-radius: 20px;
  color: #ffffff;
  box-shadow: 0 18px 40px rgba(139, 92, 246, 0.35);
}

.cta-banner h2 {
  font-size: 24px;
  font-weight: 800;
  margin-bottom: 6px;
  letter-spacing: 0.5px;
}

.cta-banner p {
  font-size: 14px;
  opacity: 0.95;
}

/* =========================================
 * Footer
 * ========================================= */
.site-footer {
  padding: 32px 24px;
  text-align: center;
  font-size: 12px;
  color: var(--text-faint);
}

.site-footer a { color: inherit; }

/* =========================================
 * 响应式
 * ========================================= */
@media (max-width: 900px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-title { font-size: 30px; }
  .card-container { transform: scale(0.7); transform-origin: center top; height: 320px; }
}

@media (max-width: 640px) {
  .nav-links { gap: 16px; }
  .nav-item a { font-size: 13px; }
  .logo-domain { display: none; }
  .hero-title { font-size: 26px; }
  .hero-subtitle { font-size: 14px; }
  .card-container { display: none; }  /* 移动端简化：隐藏扇形 */
  .features-grid { grid-template-columns: 1fr; }
  .cta-banner h2 { font-size: 20px; }
  .hero { padding: 40px 20px 32px; }
}