/* ===== 变量与基础重置 ===== */
:root {
  --mango-orange: #FF8A3D;
  --mango-amber: #E85D25;
  --mango-yellow: #FFC93C;
  --leaf-green: #4CA771;
  --bg-cream: #FFF8F0;
  --bg-dark: #241C15;
  --text-dark: #33261A;
  --text-muted: #6B5A48;
  --card-surface: #FFFDF9;
  --shadow-soft: 0 12px 30px rgba(43, 30, 20, 0.08);
  --shadow-strong: 0 18px 40px rgba(43, 30, 20, 0.16);
  --radius-lg: 20px;
  --radius-md: 16px;
  --radius-sm: 10px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --container-width: 1160px;
}

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

html { scroll-behavior: smooth; }

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

img, svg { display: block; max-width: 100%; }

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

ul { list-style: none; }

button { font-family: inherit; cursor: pointer; border: none; background: none; }

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

section { padding: 96px 0; position: relative; }

.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 56px;
}

.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--mango-amber);
  background: rgba(255, 138, 61, 0.12);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 16px;
}

h1, h2, h3 { font-weight: 800; letter-spacing: -0.01em; color: var(--text-dark); }

h2 { font-size: clamp(28px, 4vw, 38px); margin-bottom: 14px; }

.section-head p { color: var(--text-muted); font-size: 16px; }

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 15px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--mango-orange), var(--mango-amber));
  color: #fff;
  box-shadow: 0 10px 24px rgba(232, 93, 37, 0.35);
}

.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 30px rgba(232, 93, 37, 0.45); }

.btn-ghost {
  background: rgba(255, 255, 255, 0.65);
  color: var(--text-dark);
  border: 1.5px solid rgba(51, 38, 26, 0.15);
}

.btn-ghost:hover { background: #fff; transform: translateY(-2px); }

.btn-dark {
  background: var(--bg-dark);
  color: #fff;
}

.btn-dark:hover { transform: translateY(-2px); box-shadow: var(--shadow-strong); }

.btn-block { width: 100%; }

.btn-sm { padding: 10px 20px; font-size: 14px; }

/* ===== 头部导航 ===== */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 18px 0;
  transition: background 0.25s ease, box-shadow 0.25s ease, padding 0.25s ease;
}

.site-header.is-scrolled {
  background: rgba(255, 248, 240, 0.92);
  backdrop-filter: blur(10px);
  box-shadow: 0 4px 20px rgba(43, 30, 20, 0.08);
  padding: 12px 0;
}

.header-inner { display: flex; align-items: center; justify-content: space-between; }

.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 20px; }

.brand .logo-mark { width: 34px; height: 34px; }

.main-nav { display: flex; gap: 32px; }

.main-nav a {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-dark);
  position: relative;
  padding: 6px 2px;
}

.main-nav a.is-active,
.main-nav a:hover { color: var(--mango-amber); }

.main-nav a.is-active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -4px;
  height: 3px;
  border-radius: 3px;
  background: var(--mango-orange);
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}

.nav-toggle span { width: 24px; height: 2.5px; background: var(--text-dark); border-radius: 2px; transition: transform 0.25s ease, opacity 0.25s ease; }

.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

@media (max-width: 860px) {
  .main-nav {
    position: absolute;
    top: 100%; left: 0; right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--bg-cream);
    box-shadow: var(--shadow-soft);
    padding: 12px 24px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }
  .main-nav.is-open { max-height: 320px; padding: 16px 24px 24px; }
  .main-nav a { display: block; padding: 12px 0; border-bottom: 1px solid rgba(51,38,26,0.08); }
  .header-actions .btn-ghost { display: none; }
  .nav-toggle { display: flex; }
}

/* ===== Hero ===== */
.hero {
  padding: 160px 0 100px;
  background: radial-gradient(circle at 15% 20%, rgba(255, 201, 60, 0.25), transparent 45%),
              radial-gradient(circle at 85% 0%, rgba(255, 138, 61, 0.18), transparent 50%),
              var(--bg-cream);
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
}

.hero h1 {
  font-size: clamp(32px, 5vw, 50px);
  line-height: 1.25;
  margin-bottom: 20px;
}

.hero h1 .accent { color: var(--mango-amber); }

.hero-sub { font-size: 18px; color: var(--text-muted); margin-bottom: 32px; max-width: 520px; }

.hero-cta { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 36px; }

.trust-row { display: flex; gap: 28px; flex-wrap: wrap; }

.trust-row .item { display: flex; align-items: center; gap: 8px; font-size: 14px; color: var(--text-muted); font-weight: 600; }

.trust-row svg { width: 18px; height: 18px; color: var(--leaf-green); }

.hero-visual { position: relative; }

.ping-widget {
  position: absolute;
  bottom: -18px; left: -8px;
  background: var(--card-surface);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  box-shadow: var(--shadow-strong);
  display: flex; align-items: center; gap: 10px;
}

.ping-widget .dot { width: 10px; height: 10px; border-radius: 50%; background: var(--leaf-green); box-shadow: 0 0 0 4px rgba(76, 167, 113, 0.2); }

.ping-widget .value { font-weight: 800; font-size: 20px; font-variant-numeric: tabular-nums; color: var(--text-dark); }

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

/* ===== 统计条 ===== */
.stats-bar { padding: 0; margin-top: -40px; position: relative; z-index: 2; }

.stats-grid {
  background: var(--card-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-strong);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding: 36px 12px;
}

.stat-item { text-align: center; padding: 8px 12px; border-right: 1px solid rgba(51,38,26,0.08); }

.stat-item:last-child { border-right: none; }

.stat-item .num { font-size: 30px; font-weight: 800; font-variant-numeric: tabular-nums; color: var(--mango-amber); }

.stat-item .desc { font-size: 13px; color: var(--text-muted); margin-top: 4px; }

@media (max-width: 760px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 20px 0; }
  .stat-item:nth-child(2n) { border-right: none; }
  .stat-item:nth-child(n+3) { border-top: 1px solid rgba(51,38,26,0.08); padding-top: 20px; }
}

/* ===== 功能网格 ===== */
.features { background: var(--bg-cream); }

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--card-surface);
  border-radius: var(--radius-md);
  padding: 28px 22px;
  box-shadow: var(--shadow-soft);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-strong); }

.feature-icon {
  width: 48px; height: 48px;
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, rgba(255,138,61,0.16), rgba(255,201,60,0.2));
  margin-bottom: 16px;
}

.feature-icon svg { width: 26px; height: 26px; color: var(--mango-amber); }

.feature-card h3 { font-size: 17px; margin-bottom: 8px; }

.feature-card p { font-size: 14px; color: var(--text-muted); }

@media (max-width: 980px) { .feature-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .feature-grid { grid-template-columns: 1fr; } }

/* ===== 使用步骤 ===== */
.steps { background: var(--card-surface); }

.steps-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
}

.step-item { text-align: center; padding: 0 12px; }

.step-num {
  width: 52px; height: 52px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--mango-orange), var(--mango-amber));
  color: #fff;
  font-weight: 800;
  font-size: 20px;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 16px;
  box-shadow: 0 10px 20px rgba(232,93,37,0.3);
}

.step-item h3 { font-size: 16px; margin-bottom: 8px; }

.step-item p { font-size: 13px; color: var(--text-muted); }

@media (max-width: 860px) { .steps-row { grid-template-columns: 1fr 1fr; gap: 32px 20px; } }
@media (max-width: 520px) { .steps-row { grid-template-columns: 1fr; } }

/* ===== 支持平台 ===== */
.platforms { background: var(--bg-cream); }

.platform-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 18px;
}

.platform-card {
  background: var(--card-surface);
  border-radius: var(--radius-md);
  padding: 24px 12px;
  text-align: center;
  box-shadow: var(--shadow-soft);
}

.platform-card svg { width: 34px; height: 34px; margin: 0 auto 12px; color: var(--text-dark); }

.platform-card .name { font-weight: 700; font-size: 14px; margin-bottom: 10px; }

.platform-card .dl-link { font-size: 12px; color: var(--mango-amber); font-weight: 700; }

@media (max-width: 900px) { .platform-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 520px) { .platform-grid { grid-template-columns: repeat(2, 1fr); } }

/* ===== 使用场景 ===== */
.scenarios { background: var(--card-surface); }

.chip-row { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; }

.chip {
  padding: 12px 22px;
  border-radius: 999px;
  background: rgba(255, 138, 61, 0.1);
  color: var(--mango-amber);
  font-weight: 700;
  font-size: 14px;
  border: 1.5px solid rgba(255, 138, 61, 0.25);
}

/* ===== 套餐价格 ===== */
.pricing { background: var(--bg-dark); color: #fff; }

.pricing .section-head h2,
.pricing .section-head p { color: #fff; }

.pricing .section-head p { color: rgba(255,255,255,0.65); }

.billing-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin: 0 auto 48px;
}

.billing-toggle span { font-weight: 700; font-size: 14px; color: rgba(255,255,255,0.6); }

.billing-toggle span.is-active { color: #fff; }

.toggle-switch {
  width: 52px; height: 28px;
  border-radius: 999px;
  background: rgba(255,255,255,0.18);
  position: relative;
  padding: 3px;
}

.toggle-switch .knob {
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--mango-orange);
  transition: transform 0.25s ease;
}

.toggle-switch[aria-checked="true"] .knob { transform: translateX(24px); }

.save-badge {
  font-size: 11px;
  background: rgba(76,167,113,0.25);
  color: #8FE0AC;
  padding: 3px 10px;
  border-radius: 999px;
  font-weight: 700;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.price-card {
  background: rgba(255,255,255,0.04);
  border: 1.5px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-lg);
  padding: 32px 26px;
}

.price-card.is-featured {
  background: linear-gradient(160deg, rgba(255,138,61,0.16), rgba(255,201,60,0.06));
  border-color: rgba(255,138,61,0.5);
  transform: scale(1.03);
  box-shadow: 0 20px 50px rgba(0,0,0,0.35);
}

.price-card .tier-name { font-size: 18px; font-weight: 800; margin-bottom: 6px; }

.price-card .tier-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  color: var(--mango-orange);
  background: rgba(255,138,61,0.15);
  padding: 3px 10px;
  border-radius: 999px;
  margin-bottom: 14px;
}

.price-card .price { font-size: 38px; font-weight: 800; font-variant-numeric: tabular-nums; }

.price-card .price .unit { font-size: 14px; font-weight: 600; color: rgba(255,255,255,0.55); }

.price-card .price-note { font-size: 12px; color: #8FE0AC; margin: 6px 0 20px; min-height: 16px; }

.price-card .price.is-hidden { display: none; }

.price-card ul { margin: 20px 0 28px; display: flex; flex-direction: column; gap: 12px; }

.price-card li { display: flex; align-items: center; gap: 10px; font-size: 14px; color: rgba(255,255,255,0.85); }

.price-card li svg { width: 16px; height: 16px; color: var(--leaf-green); flex-shrink: 0; }

@media (max-width: 900px) { .pricing-grid { grid-template-columns: 1fr; } .price-card.is-featured { transform: none; } }

/* ===== 用户评价 ===== */
.testimonials { background: var(--bg-cream); }

.testi-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.testi-card {
  background: var(--card-surface);
  border-radius: var(--radius-md);
  padding: 26px 24px;
  box-shadow: var(--shadow-soft);
}

.testi-stars { display: flex; gap: 3px; margin-bottom: 14px; }
.testi-stars svg { width: 16px; height: 16px; color: var(--mango-yellow); }

.testi-card p.quote { font-size: 14px; color: var(--text-dark); margin-bottom: 20px; }

.testi-person { display: flex; align-items: center; gap: 12px; }

.avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 800; font-size: 14px;
  background: linear-gradient(135deg, var(--mango-orange), var(--mango-amber));
}

.testi-person .who { font-size: 13px; }
.testi-person .who .name { font-weight: 700; display: block; }
.testi-person .who .role { color: var(--text-muted); font-size: 12px; }

@media (max-width: 900px) { .testi-grid { grid-template-columns: 1fr; } }

/* ===== FAQ ===== */
.faq { background: var(--card-surface); }

.faq-list { max-width: 760px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }

.faq-item {
  background: var(--bg-cream);
  border-radius: var(--radius-md);
  padding: 6px 24px;
  border: 1px solid rgba(51,38,26,0.06);
}

.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 18px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 700;
  font-size: 15px;
  gap: 16px;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item .chevron { width: 18px; height: 18px; flex-shrink: 0; transition: transform 0.25s ease; color: var(--mango-amber); }

.faq-item[open] .chevron { transform: rotate(180deg); }

.faq-item .faq-answer { padding: 0 0 20px; font-size: 14px; color: var(--text-muted); }

/* ===== 底部CTA ===== */
.cta-banner {
  background: linear-gradient(135deg, var(--mango-orange), var(--mango-amber));
  border-radius: var(--radius-lg);
  margin: 0 24px;
  padding: 64px 32px;
  text-align: center;
  color: #fff;
}

.cta-banner h2 { color: #fff; }
.cta-banner p { color: rgba(255,255,255,0.85); margin-bottom: 32px; }
.cta-banner .hero-cta { justify-content: center; }
.cta-banner .btn-ghost { background: rgba(255,255,255,0.15); color: #fff; border-color: rgba(255,255,255,0.4); }
.cta-banner .btn-ghost:hover { background: rgba(255,255,255,0.25); }

/* ===== Footer ===== */
.site-footer { background: var(--bg-dark); color: rgba(255,255,255,0.7); padding: 72px 0 32px; margin-top: 96px; }

.footer-grid { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 40px; margin-bottom: 48px; }

.footer-brand .brand { color: #fff; margin-bottom: 14px; }
.footer-brand p { font-size: 14px; line-height: 1.7; max-width: 280px; }

.footer-col h4 { color: #fff; font-size: 14px; margin-bottom: 16px; }
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col a { font-size: 13px; color: rgba(255,255,255,0.6); }
.footer-col a:hover { color: #fff; }

.footer-disclaimer { font-size: 12px; line-height: 1.8; color: rgba(255,255,255,0.45); border-top: 1px solid rgba(255,255,255,0.1); padding-top: 24px; }
.footer-disclaimer p + p { margin-top: 6px; }

@media (max-width: 860px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .footer-grid { grid-template-columns: 1fr; } }

/* ===== 通用响应式 ===== */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { order: -1; max-width: 420px; margin: 0 auto 20px; }
}

/* ===== 滚动入场动画 ===== */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.in-view { opacity: 1; transform: translateY(0); }

/* ===== 波浪分隔 ===== */
.divider-wrap { line-height: 0; }
.divider-wrap.on-dark { background: var(--bg-dark); }
.divider-wrap.on-cream { background: var(--bg-cream); }
.divider { display: block; width: 100%; height: 60px; }
.divider path { fill: var(--bg-cream); }
.divider.to-dark path { fill: var(--bg-dark); }
.divider.to-card path { fill: var(--card-surface); }