/* 
  🍉 五一吃西瓜 — 设计系统
  概念：夏日西瓜切片 | 有机曲线 | 杂志感排版
  主色：西瓜红 #f0485a · 深瓜绿 #1e5240 · 奶油白 #fdf9f2
*/

:root {
  --melon: #f0485a;
  --melon-dark: #df4154;
  --melon-green: #1e5240;
  --melon-green-soft: #d4e8d0;
  --melon-yellow: #f5a623;
  --cream: #fdf9f2;
  --cream-deep: #f5eee4;
  --border: #e9e3dc;
  --ink: #2b3a35;
  --shadow: 0 12px 30px rgba(30, 82, 64, 0.08);
}

/* 基础重置 */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  overflow-x: hidden;
  background-color: var(--cream);
  color: var(--ink);
  line-height: 1.7;
  min-height: 100vh;
  background-image:
    radial-gradient(circle at 90% 8%, rgba(240, 72, 90, 0.08) 0%, transparent 35%),
    radial-gradient(circle at 10% 92%, rgba(30, 82, 64, 0.06) 0%, transparent 40%);
}

::selection {
  background: var(--melon);
  color: #fff;
}

/* 核心布局 — 必须居中 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
  position: relative;
}

.section:nth-child(even) {
  background: var(--cream-deep);
}

.section::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 10%;
  right: 10%;
  height: 1px;
  background: linear-gradient(to right, transparent, rgba(240, 72, 90, 0.15), transparent);
}

/* 导航 — 固定顶部 */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(253, 249, 242, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(240, 72, 90, 0.18);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 900;
  font-size: 1.25rem;
  text-decoration: none;
  color: var(--melon-green);
  letter-spacing: -0.02em;
}

.logo-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--melon-green);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: #fff;
  position: relative;
  box-shadow: 0 0 0 3px var(--melon-green-soft);
}

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

.main-nav a {
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--ink);
  transition: color 0.2s;
  position: relative;
  letter-spacing: 0.01em;
}

.main-nav a:not(.nav-cta)::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: var(--melon);
  transform: scaleX(0);
  transform-origin: right center;
  transition: transform 0.3s ease;
}

.main-nav a:not(.nav-cta):hover {
  color: var(--melon);
}

.main-nav a:not(.nav-cta):hover::after {
  transform: scaleX(1);
  transform-origin: left center;
}

.nav-cta {
  padding: 9px 22px;
  border-radius: 999px;
  color: #fff !important;
  font-weight: 700;
  background: var(--melon);
  box-shadow: 0 4px 12px rgba(240, 72, 90, 0.25);
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(240, 72, 90, 0.35);
  background: var(--melon-dark);
}

.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: none;
  background: transparent;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: var(--melon-green);
  border-radius: 10px;
}

/* 首页Hero */
.hero {
  min-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 48px;
  padding-top: 80px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  right: -60px;
  top: 18%;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  background: radial-gradient(circle at 40% 35%, var(--melon-green-soft) 0%, transparent 70%);
  z-index: 0;
  opacity: 0.7;
}

.hero::after {
  content: '';
  position: absolute;
  right: 180px;
  top: 46%;
  width: 12px;
  height: 9px;
  border-radius: 50%;
  transform: rotate(20deg);
  box-shadow:
    40px 32px 0 -2px rgba(30, 82, 64, 0.25),
    -32px 60px 0 -2px rgba(240, 72, 90, 0.4),
    88px 82px 0 -2px rgba(30, 82, 64, 0.3),
    10px 100px 0 -3px rgba(240, 72, 90, 0.2);
  z-index: 1;
}

.hero-content {
  max-width: 620px;
  position: relative;
  z-index: 2;
}

.hero-eyebrow {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  padding: 6px 18px;
  border-radius: 999px;
  background: var(--melon-green-soft);
  color: var(--melon-green);
  margin-bottom: 18px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.hero h1 {
  font-size: clamp(2.6rem, 5vw, 3.8rem);
  font-weight: 900;
  line-height: 1.12;
  margin-bottom: 20px;
  letter-spacing: -0.03em;
  color: var(--melon);
  background: linear-gradient(135deg, var(--melon) 0%, var(--melon-yellow) 55%, var(--melon-green) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.1rem;
  opacity: 0.75;
  max-width: 560px;
  margin-bottom: 32px;
  color: var(--melon-green);
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.hero-image {
  flex-shrink: 0;
  width: 380px;
  height: 400px;
  max-width: 100%;
  border-radius: 50% 50% 30% 30%;
  overflow: hidden;
  position: relative;
  z-index: 2;
  background: var(--melon-green-soft);
  border: 8px solid #fff;
  box-shadow: 0 24px 50px rgba(30, 82, 64, 0.15);
}

.hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: transform 0.25s, box-shadow 0.25s, background 0.25s;
  letter-spacing: 0.02em;
}

.btn-primary {
  background: var(--melon);
  color: #fff;
  box-shadow: 0 8px 20px rgba(240, 72, 90, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  background: var(--melon-dark);
  box-shadow: 0 12px 28px rgba(240, 72, 90, 0.35);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--melon-green);
  color: var(--melon-green);
}

.btn-outline:hover {
  background: var(--melon-green);
  color: #fff;
  transform: translateY(-2px);
}

/* 标签/标题 */
.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--melon);
  background: rgba(240, 72, 90, 0.08);
  padding: 5px 16px;
  border-radius: 999px;
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 800;
  color: var(--melon-green);
  margin-bottom: 14px;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.section-title::after {
  content: '';
  display: block;
  width: 48px;
  height: 4px;
  border-radius: 4px;
  background: linear-gradient(to right, var(--melon), var(--melon-yellow));
  margin-top: 10px;
}

.section-desc {
  max-width: 640px;
  opacity: 0.72;
  margin-bottom: 40px;
  color: var(--ink);
  line-height: 1.7;
}

/* 卡片网格 */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 24px;
}

.category-card {
  border-radius: 20px;
  padding: 32px 28px;
  border: 1px solid var(--border);
  background: #fff;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s;
  position: relative;
  overflow: hidden;
}

.category-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(to right, var(--melon), var(--melon-yellow));
  opacity: 0;
  transition: opacity 0.3s;
}

.category-card:hover {
  transform: translateY(-6px) rotate(-1deg);
  box-shadow: 0 16px 36px rgba(30, 82, 64, 0.1);
  border-color: rgba(240, 72, 90, 0.35);
}

.category-card:hover::before {
  opacity: 1;
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: var(--melon-green-soft);
  color: var(--melon-green);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 18px;
  transition: background 0.3s, color 0.3s, transform 0.3s;
}

.category-card:hover .card-icon {
  background: var(--melon);
  color: #fff;
  transform: scale(1.06) rotate(-5deg);
}

.card-link {
  font-weight: 700;
  font-size: 0.85rem;
  text-decoration: none;
  color: var(--melon);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.card-link::after {
  content: '→';
  transition: transform 0.2s;
}

.card-link:hover::after {
  transform: translateX(4px);
}

/* 特性块 */
.feature-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}

.feature-image {
  border-radius: 24px;
  overflow: hidden;
  position: relative;
  box-shadow: var(--shadow);
  border: 6px solid #fff;
  background: var(--melon-green-soft);
}

.feature-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.feature-text {
  position: relative;
}

.feature-text::before {
  content: '”';
  position: absolute;
  top: -40px;
  left: -20px;
  font-size: 6rem;
  color: var(--melon-green-soft);
  font-family: Georgia, serif;
  line-height: 1;
  z-index: -1;
}

.feature-list {
  list-style: none;
  margin-top: 16px;
}

.feature-list li {
  padding: 8px 0;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
}

.feature-list li::before {
  content: '✓';
  font-weight: 900;
  color: var(--melon);
  background: rgba(240, 72, 90, 0.08);
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  flex-shrink: 0;
}

/* 数据条 */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stat-item {
  padding: 32px 20px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: #fff;
  position: relative;
  transition: transform 0.3s;
}

.stat-item::before {
  content: '';
  position: absolute;
  top: -1px;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 3px;
  border-radius: 0 0 6px 6px;
  background: var(--melon);
}

.stat-item:hover {
  transform: translateY(-4px);
}

.stat-number {
  font-size: 2.4rem;
  font-weight: 900;
  color: var(--melon);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.stat-label {
  font-size: 0.9rem;
  opacity: 0.55;
  margin-top: 8px;
  letter-spacing: 0.04em;
}

/* 内容墙 */
.content-wall {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.content-wall-item {
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: #fff;
  transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
  position: relative;
}

.content-wall-item:hover {
  transform: translateY(-6px) scale(1.01);
  box-shadow: 0 18px 40px rgba(30, 82, 64, 0.12);
  border-color: rgba(30, 82, 64, 0.2);
}

.content-wall-item img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  display: block;
  transition: transform 0.5s ease;
}

.content-wall-item:hover img {
  transform: scale(1.05);
}

.content-wall-body {
  padding: 22px;
}

/* FAQ */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--border);
  border-radius: 16px;
  margin-bottom: 10px;
  overflow: hidden;
  cursor: pointer;
  background: #fff;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.faq-item:hover {
  border-color: rgba(240, 72, 90, 0.25);
}

.faq-item.open {
  border-color: rgba(240, 72, 90, 0.4);
  box-shadow: 0 8px 24px rgba(240, 72, 90, 0.06);
}

.faq-item .faq-question {
  padding: 18px 22px;
  font-weight: 700;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--melon-green);
  font-size: 1.02rem;
}

.faq-question::after {
  content: '+';
  width: 28px;
  height: 28px;
  background: var(--melon-green-soft);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 400;
  color: var(--melon-green);
  transition: transform 0.3s, background 0.3s;
  flex-shrink: 0;
}

.faq-item.open .faq-question::after {
  content: '−';
  background: var(--melon);
  color: #fff;
  transform: rotate(180deg);
}

.faq-item .faq-answer {
  padding: 0 22px 20px;
  font-size: 0.95rem;
  line-height: 1.7;
  opacity: 0.65;
}

/* CTA横幅 */
.cta-banner {
  padding: 60px 24px;
  text-align: center;
  border-radius: 28px;
  background: linear-gradient(135deg, var(--melon-green) 0%, #2d6a4f 100%);
  color: #fff;
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  top: -60px;
  right: -40px;
}

.cta-banner::after {
  content: '';
  position: absolute;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  bottom: -30px;
  left: -20px;
}

.cta-banner h2 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: #fff;
  position: relative;
  z-index: 1;
}

.cta-banner .btn-primary {
  background: #fff;
  color: var(--melon-green);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
  margin-top: 16px;
  position: relative;
  z-index: 1;
}

.cta-banner .btn-primary:hover {
  transform: translateY(-2px);
  background: var(--melon-green-soft);
  color: var(--melon-green);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.18);
}

/* 页脚 */
.site-footer {
  padding: 56px 0 28px;
  background: linear-gradient(180deg, var(--cream) 0%, var(--melon-green-soft) 100%);
}

.site-footer .container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
}

.footer-brand {
  font-weight: 600;
}

.footer-brand a {
  font-size: 0.85rem;
  opacity: 0.6;
  text-decoration: none;
  color: var(--melon-green);
}

.footer-col h4 {
  font-size: 0.85rem;
  letter-spacing: 1px;
  margin-bottom: 14px;
  color: var(--melon-green);
  text-transform: uppercase;
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  padding: 4px 0;
}

.footer-col ul a {
  text-decoration: none;
  color: var(--ink);
  opacity: 0.6;
  font-size: 0.9rem;
  transition: opacity 0.2s, color 0.2s;
}

.footer-col ul a:hover {
  opacity: 1;
  color: var(--melon);
}

.footer-bottom {
  border-top: 1px solid rgba(30, 82, 64, 0.12);
  margin-top: 40px;
  padding-top: 20px;
  text-align: center;
  font-size: 0.85rem;
  color: rgba(30, 82, 64, 0.6);
}

/* 工具类 */
.text-accent {
  color: var(--melon);
  font-weight: 700;
}

.text-center {
  text-align: center;
}

.seo-description {
  max-width: 600px;
  margin: 0 auto 48px;
  opacity: 0.65;
  text-align: center;
  line-height: 1.7;
}

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }

/* 自定义滚动条 */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--cream);
}

::-webkit-scrollbar-thumb {
  background: var(--melon-green);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--melon);
}

/* ⚠️ 响应式 */
@media (max-width: 768px) {
  .hero {
    flex-direction: column;
    text-align: center;
    padding-top: 100px;
    gap: 32px;
  }
  .hero-content {
    max-width: 100%;
  }
  .hero p {
    margin-left: auto;
    margin-right: auto;
  }
  .hero-buttons {
    justify-content: center;
  }
  .hero-image {
    width: 260px;
    height: 260px;
  }
  .feature-block {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .main-nav {
    display: none;
  }
  .menu-toggle {
    display: flex;
  }
  .main-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 68px;
    left: 0;
    width: 100%;
    background: var(--cream);
    padding: 20px;
    gap: 16px;
    border-bottom: 2px solid var(--melon);
    box-shadow: 0 16px 30px rgba(30, 82, 64, 0.08);
  }
  .main-nav.open a {
    font-size: 1rem;
    padding: 6px 0;
  }
}

@media (max-width: 480px) {
  .cards-grid,
  .content-wall,
  .stats-bar {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .hero-buttons {
    flex-direction: column;
  }
  .hero h1 {
    font-size: 2.2rem;
  }
  .section-title {
    font-size: 1.6rem;
  }
  .btn {
    width: 100%;
    justify-content: center;
  }
}