/* ===== 基础变量 ===== */
:root {
  --color-primary: #ffb300;
  --color-primary-light: #ffd877;
  --color-primary-dark: #e69500;
  --color-accent: #5fbf3a;
  --color-ink: #1f2430;
  --color-ink-soft: #4a5063;
  --color-bg: #fffdf7;
  --color-bg-alt: #fff7e6;
  --color-card: #ffffff;
  --color-border: #f0e3c4;
  --shadow-soft: 0 10px 30px rgba(31, 36, 48, 0.08);
  --shadow-hover: 0 16px 40px rgba(255, 179, 0, 0.25);
  --radius-lg: 20px;
  --radius-md: 14px;
  --max-width: 1160px;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-family);
  color: var(--color-ink);
  background: var(--color-bg);
  line-height: 1.6;
}

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

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

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

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

.section-tag {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 999px;
  background: var(--color-bg-alt);
  color: var(--color-primary-dark);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.5px;
  margin-bottom: 14px;
}

.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 48px;
}

.section-head h2 {
  font-size: clamp(26px, 4vw, 36px);
  margin: 0 0 12px;
}

.section-head p {
  color: var(--color-ink-soft);
  margin: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
  color: var(--color-ink);
  box-shadow: var(--shadow-hover);
}

.btn-primary:hover {
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  border-color: var(--color-ink);
  color: var(--color-ink);
}

.btn-outline:hover {
  background: var(--color-ink);
  color: #fff;
}

.btn-block {
  width: 100%;
}

/* ===== 顶部导航 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 253, 247, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
}

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

.brand img {
  width: 36px;
  height: 36px;
}

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

.nav-links a {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-ink-soft);
  transition: color 0.2s ease;
}

.nav-links a:hover {
  color: var(--color-primary-dark);
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-ink);
  border-radius: 2px;
}

/* ===== Hero ===== */
.hero {
  padding: 72px 0 96px;
  overflow: hidden;
}

.hero .container {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--color-bg-alt);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 20px;
}

.hero h1 {
  font-size: clamp(32px, 5vw, 48px);
  line-height: 1.25;
  margin: 0 0 18px;
}

.hero h1 .highlight {
  color: var(--color-primary-dark);
}

.hero p.lead {
  font-size: 17px;
  color: var(--color-ink-soft);
  margin: 0 0 32px;
  max-width: 480px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.hero-stats {
  display: flex;
  gap: 36px;
  flex-wrap: wrap;
}

.hero-stats .stat b {
  display: block;
  font-size: 26px;
  color: var(--color-ink);
}

.hero-stats .stat span {
  font-size: 13px;
  color: var(--color-ink-soft);
}

.hero-visual {
  position: relative;
}

/* ===== 通用 fade-in 动画 ===== */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== 功能特色 ===== */
.features {
  padding: 96px 0;
  background: var(--color-bg-alt);
}

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

.feature-card {
  background: var(--color-card);
  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-hover);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--color-bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  color: var(--color-primary-dark);
}

.feature-card h3 {
  font-size: 17px;
  margin: 0 0 8px;
}

.feature-card p {
  font-size: 14px;
  color: var(--color-ink-soft);
  margin: 0;
}

/* ===== 节点覆盖 ===== */
.coverage {
  padding: 96px 0;
}

.coverage-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.coverage-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 22px;
}

.coverage-card h3 {
  margin: 0 0 6px;
  font-size: 16px;
}

.coverage-card p {
  margin: 0;
  font-size: 13px;
  color: var(--color-ink-soft);
}

.coverage-note {
  text-align: center;
  margin-top: 32px;
  color: var(--color-ink-soft);
  font-size: 13px;
}

/* ===== 价格套餐 ===== */
.pricing {
  padding: 96px 0;
  background: var(--color-bg-alt);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  align-items: stretch;
}

.price-card {
  background: var(--color-card);
  border-radius: var(--radius-lg);
  padding: 30px 24px;
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

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

.price-card.is-popular {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-hover);
  transform: scale(1.04);
}

.price-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-primary);
  color: var(--color-ink);
  font-size: 12px;
  font-weight: 700;
  padding: 5px 14px;
  border-radius: 999px;
}

.price-card h3 {
  margin: 0 0 6px;
  font-size: 18px;
}

.price-card .price-quota {
  font-size: 13px;
  color: var(--color-ink-soft);
  margin-bottom: 18px;
}

.price-card .price-amount {
  font-size: 34px;
  font-weight: 800;
  margin-bottom: 4px;
}

.price-card .price-amount small {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-ink-soft);
}

.price-card .price-origin {
  font-size: 13px;
  color: #b3b8c4;
  text-decoration: line-through;
  margin-bottom: 18px;
}

.price-features {
  margin: 0 0 24px;
  flex: 1;
}

.price-features li {
  font-size: 13px;
  color: var(--color-ink-soft);
  padding-left: 20px;
  position: relative;
  margin-bottom: 10px;
}

.price-features li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: 700;
}

.pricing-note {
  text-align: center;
  margin-top: 28px;
  font-size: 13px;
  color: var(--color-ink-soft);
}

/* ===== 用户评价 ===== */
.testimonials {
  padding: 96px 0;
}

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

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

.testimonial-card p.quote {
  font-size: 15px;
  color: var(--color-ink);
  margin: 0 0 18px;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 10px;
}

.testimonial-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--color-primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--color-ink);
}

.testimonial-author span {
  font-size: 13px;
  color: var(--color-ink-soft);
}

.testimonial-disclaimer {
  text-align: center;
  margin-top: 24px;
  font-size: 12px;
  color: #b3b8c4;
}

/* ===== FAQ ===== */
.faq {
  padding: 96px 0;
  background: var(--color-bg-alt);
}

.faq-list {
  max-width: 760px;
  margin: 0 auto;
}

.faq-item {
  background: var(--color-card);
  border-radius: var(--radius-md);
  margin-bottom: 14px;
  border: 1px solid var(--color-border);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 20px 24px;
  background: none;
  border: none;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  color: var(--color-ink);
}

.faq-question .icon {
  flex-shrink: 0;
  transition: transform 0.25s ease;
}

.faq-item.is-open .faq-question .icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  padding: 0 24px;
}

.faq-answer p {
  margin: 0 0 20px;
  font-size: 14px;
  color: var(--color-ink-soft);
}

.faq-item.is-open .faq-answer {
  max-height: 300px;
}

/* ===== 关于我们 ===== */
.about {
  padding: 96px 0;
}

.about .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.about-list li {
  padding-left: 22px;
  position: relative;
  margin-bottom: 12px;
  font-size: 14px;
  color: var(--color-ink-soft);
}

.about-list li::before {
  content: "•";
  color: var(--color-primary-dark);
  position: absolute;
  left: 0;
  font-size: 18px;
  line-height: 1.2;
}

/* ===== CTA ===== */
.cta {
  margin: 0 24px 96px;
  max-width: calc(var(--max-width) - 48px);
  margin-left: auto;
  margin-right: auto;
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
  border-radius: 28px;
  padding: 56px 40px;
  text-align: center;
}

.cta h2 {
  font-size: clamp(24px, 3.5vw, 32px);
  margin: 0 0 12px;
}

.cta p {
  margin: 0 0 28px;
  color: var(--color-ink-soft);
}

.cta .btn-outline {
  border-color: var(--color-ink);
}

/* ===== 页脚 ===== */
.site-footer {
  background: var(--color-ink);
  color: #c7cad4;
  padding: 64px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 32px;
  margin-bottom: 40px;
}

.footer-brand .brand {
  color: #fff;
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 13px;
  color: #9096a6;
  max-width: 260px;
}

.footer-col h4 {
  color: #fff;
  font-size: 14px;
  margin: 0 0 16px;
}

.footer-col li {
  margin-bottom: 10px;
}

.footer-col a {
  font-size: 13px;
  color: #9096a6;
  transition: color 0.2s ease;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 24px;
  font-size: 12px;
  color: #6a6f80;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom p {
  margin: 0;
  max-width: 720px;
}

/* ===== 响应式 ===== */
@media (max-width: 960px) {
  .hero .container {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    order: -1;
    max-width: 360px;
    margin: 0 auto;
  }

  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .coverage-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .price-card.is-popular {
    transform: none;
  }

  .testimonial-grid {
    grid-template-columns: 1fr;
  }

  .about .container {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 720px) {
  .nav-links,
  .nav-actions .btn-outline {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  body.nav-open .nav-links {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    padding: 20px 24px;
    gap: 18px;
    border-bottom: 1px solid var(--color-border);
  }

  .feature-grid,
  .pricing-grid {
    grid-template-columns: 1fr;
  }

  .coverage-grid {
    grid-template-columns: 1fr;
  }

  .hero-stats {
    gap: 24px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
  }
}