/* ============================================
   开云入口 - 开启智慧云端之门
   设计风格：有机现代主义 · 暖白+陶土+鼠尾草绿
   ============================================ */

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

:root {
  --cream: #faf7f2;
  --warm-white: #fdfbf8;
  --soft-beige: #f5f0ea;
  --terracotta: #c87d5e;
  --terracotta-dark: #b06a4c;
  --terracotta-light: #e8c4b2;
  --sage: #8a9b7e;
  --sage-dark: #6e8064;
  --sage-light: #c8d4c0;
  --warm-amber: #d4a853;
  --warm-amber-light: #f0d89c;
  --deep-brown: #3b322e;
  --warm-gray: #8c8078;
  --light-border: #e8e2db;
  --card-shadow: 0 1px 3px rgba(59,50,46,0.04), 0 4px 12px rgba(59,50,46,0.06);
  --card-shadow-hover: 0 2px 6px rgba(59,50,46,0.06), 0 8px 24px rgba(59,50,46,0.10);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
}

body {
  font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  overflow-x: hidden;
  background: var(--warm-white);
  color: var(--deep-brown);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 微妙的顶部光晕 */
body::before {
  content: '';
  position: fixed;
  top: -30%;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 700px;
  background: radial-gradient(ellipse at center, rgba(232,196,178,0.18) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* === 核心布局 === */
.container { max-width:1200px; margin:0 auto; padding:0 24px; position:relative; z-index:1; }
.section { padding:80px 0; position:relative; }
.section:nth-child(even) { background: var(--soft-beige); }

/* 偶数section的微妙纹理 */
.section:nth-child(even)::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 80% 20%, rgba(200,212,192,0.25) 0%, transparent 60%);
  pointer-events: none;
}

/* === 导航 === */
.site-header {
  position:fixed;
  top:0;
  left:0;
  width:100%;
  z-index:1000;
  background:rgba(253,251,248,0.88);
  backdrop-filter:blur(18px);
  -webkit-backdrop-filter:blur(18px);
  border-bottom:1px solid var(--light-border);
  transition: all 0.3s ease;
}

.site-header.scrolled {
  box-shadow: 0 1px 20px rgba(59,50,46,0.06);
}

.header-inner {
  display:flex;
  align-items:center;
  justify-content:space-between;
  height:68px;
  max-width:1200px;
  margin:0 auto;
  padding:0 24px;
}

.logo {
  display:flex;
  align-items:center;
  gap:10px;
  font-weight:700;
  font-size:1.25rem;
  text-decoration:none;
  color:var(--deep-brown);
  letter-spacing: -0.3px;
  transition: opacity 0.2s;
}
.logo:hover { opacity: 0.8; }

.logo-icon {
  width:38px;
  height:38px;
  border-radius: 10px;
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:1.1rem;
  background: linear-gradient(135deg, var(--terracotta) 0%, #d9956f 50%, var(--warm-amber) 100%);
  color: #fff;
  font-weight: 800;
  letter-spacing: 0;
  box-shadow: 0 3px 10px rgba(200,125,94,0.25);
}

.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(--warm-gray);
  transition: all 0.2s ease;
  position: relative;
  padding: 4px 0;
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--terracotta);
  border-radius: 2px;
  transition: width 0.25s ease;
}

.main-nav a:hover {
  color: var(--deep-brown);
}
.main-nav a:hover::after {
  width: 100%;
}

.nav-cta {
  padding:9px 22px !important;
  border-radius: 25px !important;
  color:#fff !important;
  font-weight:600 !important;
  background: linear-gradient(135deg, var(--terracotta) 0%, #d4855e 100%);
  box-shadow: 0 3px 12px rgba(200,125,94,0.3);
  transition: all 0.25s ease !important;
}
.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(200,125,94,0.4);
  color: #fff !important;
}
.nav-cta::after { display: none !important; }

.menu-toggle {
  display:none;
  background: none;
  border: none;
  cursor: pointer;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  color: var(--deep-brown);
  font-size: 1.4rem;
  transition: background 0.2s;
}
.menu-toggle:hover { background: var(--soft-beige); }

/* === 首页Hero === */
.hero {
  min-height:70vh;
  display:flex;
  align-items:center;
  position: relative;
  padding-top: 68px;
}

.hero::before {
  content: '';
  position: absolute;
  top: 10%;
  right: -5%;
  width: 500px;
  height: 500px;
  background: radial-gradient(ellipse at center, rgba(200,212,192,0.3) 0%, transparent 70%);
  pointer-events: none;
  border-radius: 50%;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: 15%;
  left: -8%;
  width: 350px;
  height: 350px;
  background: radial-gradient(ellipse at center, rgba(232,196,178,0.25) 0%, transparent 70%);
  pointer-events: none;
  border-radius: 50%;
}

.hero-content {
  max-width:720px;
  position: relative;
  z-index: 2;
}

.hero-eyebrow {
  display:inline-block;
  font-size:0.85rem;
  font-weight:600;
  padding:5px 16px;
  border-radius:20px;
  margin-bottom:18px;
  background: var(--sage-light);
  color: var(--sage-dark);
  letter-spacing: 0.6px;
}

.hero h1 {
  font-size:2.8rem;
  line-height:1.15;
  margin-bottom:20px;
  font-weight: 800;
  letter-spacing: -0.8px;
  color: var(--deep-brown);
}

.hero h1 .highlight {
  background: linear-gradient(180deg, transparent 58%, rgba(200,125,94,0.22) 58%);
  padding: 0 4px;
}

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

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

.hero-image {
  border-radius: var(--radius-lg);
  overflow:hidden;
  position: relative;
  box-shadow: var(--card-shadow-hover);
  border: 1px solid var(--light-border);
}
.hero-image img {
  width:100%;
  height:auto;
  display: block;
}

/* === 按钮 === */
.btn {
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:13px 30px;
  border-radius: 25px;
  font-weight:600;
  cursor:pointer;
  border:none;
  text-decoration:none;
  transition: all 0.25s ease;
  font-size: 0.95rem;
  letter-spacing: 0.2px;
}

.btn-primary {
  color:#fff;
  background: linear-gradient(135deg, var(--terracotta) 0%, #d4855e 100%);
  box-shadow: 0 4px 14px rgba(200,125,94,0.35);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 7px 22px rgba(200,125,94,0.45);
}

.btn-outline {
  background:transparent;
  border:1.8px solid var(--terracotta);
  color: var(--terracotta);
}
.btn-outline:hover {
  background: var(--terracotta);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(200,125,94,0.25);
}

/* === 标签/标题 === */
.section-label {
  display:inline-block;
  font-size:0.8rem;
  font-weight:700;
  letter-spacing:2.5px;
  margin-bottom:12px;
  text-transform: uppercase;
  color: var(--terracotta);
  position: relative;
  padding-left: 16px;
}
.section-label::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--terracotta);
}

.section-title {
  font-size:2rem;
  margin-bottom:14px;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--deep-brown);
  line-height: 1.25;
}

.section-desc {
  max-width:600px;
  opacity:0.7;
  margin-bottom:40px;
  color: var(--warm-gray);
  font-size: 1.05rem;
  line-height: 1.7;
}

/* === 卡片网格 === */
.cards-grid {
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(260px,1fr));
  gap:24px;
}

.category-card {
  border-radius: var(--radius-md);
  padding:30px 26px;
  border:1px solid var(--light-border);
  transition: all 0.3s ease;
  background: #fff;
  position: relative;
  overflow: hidden;
}

.category-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--terracotta-light) 0%, var(--sage-light) 100%);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.category-card:hover {
  transform:translateY(-4px);
  box-shadow: var(--card-shadow-hover);
  border-color: transparent;
}
.category-card:hover::before {
  opacity: 1;
}

.card-icon {
  width:50px;
  height:50px;
  border-radius: 14px;
  display:flex;
  align-items:center;
  justify-content:center;
  margin-bottom:18px;
  font-size:1.4rem;
  background: var(--soft-beige);
  color: var(--terracotta);
  transition: all 0.3s ease;
}

.category-card:nth-child(2) .card-icon {
  background: #f0f5ee;
  color: var(--sage-dark);
}
.category-card:nth-child(3) .card-icon {
  background: #fef8f0;
  color: var(--warm-amber);
}
.category-card:nth-child(4) .card-icon {
  background: #fdf5f2;
  color: #c97d6a;
}
.category-card:nth-child(5) .card-icon {
  background: #f2f4f0;
  color: #7d8f74;
}

.category-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--deep-brown);
}
.category-card p {
  font-size: 0.9rem;
  color: var(--warm-gray);
  line-height: 1.6;
  margin-bottom: 14px;
}

.card-link {
  font-weight:600;
  font-size:0.85rem;
  text-decoration:none;
  color: var(--terracotta);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap 0.2s;
}
.card-link:hover { gap: 8px; }

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

.feature-image {
  border-radius: var(--radius-lg);
  overflow:hidden;
  box-shadow: var(--card-shadow);
  border: 1px solid var(--light-border);
  position: relative;
}
.feature-image::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(200,125,94,0.06) 0%, transparent 60%);
  pointer-events: none;
}
.feature-image img {
  width:100%;
  height:auto;
  display: block;
}

.feature-text { }
.feature-text h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--deep-brown);
}
.feature-text p {
  color: var(--warm-gray);
  line-height: 1.7;
  margin-bottom: 16px;
}

.feature-list {
  list-style:none;
}
.feature-list li {
  padding:7px 0;
  display:flex;
  align-items:center;
  gap:10px;
  color: var(--deep-brown);
  font-size: 0.95rem;
}
.feature-list li::before {
  content:'✓';
  font-weight:700;
  color: var(--sage-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--sage-light);
  font-size: 0.75rem;
  flex-shrink: 0;
}

/* === 数据条 === */
.stats-bar {
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:20px;
  text-align:center;
}

.stat-item {
  padding:28px 20px;
  border-radius: var(--radius-md);
  border:1px solid var(--light-border);
  background: #fff;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}
.stat-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--card-shadow-hover);
}

.stat-item::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 3px;
  border-radius: 3px;
  background: var(--terracotta-light);
  transition: width 0.3s ease;
}
.stat-item:hover::before {
  width: 60px;
}

.stat-number {
  font-size:2.4rem;
  font-weight:800;
  color: var(--deep-brown);
  letter-spacing: -1px;
  line-height: 1;
}
.stat-number .plus {
  color: var(--terracotta);
}

.stat-label {
  font-size:0.9rem;
  opacity:0.65;
  margin-top:8px;
  color: var(--warm-gray);
  font-weight: 500;
}

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

.content-wall-item {
  border-radius: var(--radius-md);
  overflow:hidden;
  border:1px solid var(--light-border);
  transition: all 0.3s ease;
  background: #fff;
}
.content-wall-item:hover {
  transform:translateY(-4px);
  box-shadow: var(--card-shadow-hover);
  border-color: transparent;
}

.content-wall-item img {
  width:100%;
  height:200px;
  object-fit:cover;
  display: block;
  transition: transform 0.4s ease;
}
.content-wall-item:hover img {
  transform: scale(1.04);
}

.content-wall-body {
  padding:20px 22px;
}
.content-wall-body h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--deep-brown);
}
.content-wall-body p {
  font-size: 0.88rem;
  color: var(--warm-gray);
  line-height: 1.6;
}
.content-wall-body .meta {
  font-size: 0.78rem;
  color: var(--terracotta);
  font-weight: 600;
  margin-top: 8px;
}

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

.faq-item {
  border:1px solid var(--light-border);
  border-radius: var(--radius-sm);
  margin-bottom:10px;
  overflow:hidden;
  cursor:pointer;
  background: #fff;
  transition: all 0.25s ease;
}
.faq-item:hover {
  border-color: var(--terracotta-light);
}

.faq-item .faq-question {
  padding:18px 22px;
  font-weight:600;
  display:flex;
  justify-content:space-between;
  align-items: center;
  color: var(--deep-brown);
  font-size: 0.98rem;
  gap: 16px;
}

.faq-item .faq-question::after {
  content: '+';
  font-size: 1.3rem;
  font-weight: 400;
  color: var(--terracotta);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

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

.faq-item .faq-answer {
  padding:0 22px 18px;
  display:none;
  opacity:0.7;
  color: var(--warm-gray);
  line-height: 1.7;
  font-size: 0.93rem;
}

.faq-item.open .faq-answer {
  display:block;
  animation: fadeSlideIn 0.3s ease;
}

@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 0.7; transform: translateY(0); }
}

/* === CTA横幅 === */
.cta-banner {
  padding:60px 24px;
  text-align:center;
  border-radius: var(--radius-xl);
  color:#fff;
  background: linear-gradient(160deg, #c87d5e 0%, #d9956f 30%, #c97d5a 60%, #b86e50 100%);
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -15%;
  width: 350px;
  height: 350px;
  background: radial-gradient(circle, rgba(255,255,255,0.08) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.cta-banner::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 280px;
  height: 280px;
  background: radial-gradient(circle, rgba(240,216,156,0.15) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.cta-banner h2 {
  color:#fff;
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 12px;
  position: relative;
  z-index: 1;
}

.cta-banner p {
  color: rgba(255,255,255,0.85);
  margin-bottom: 28px;
  position: relative;
  z-index: 1;
  font-size: 1.05rem;
}

.cta-banner .btn-primary {
  background:#fff;
  color: var(--terracotta-dark);
  box-shadow: 0 4px 16px rgba(0,0,0,0.12);
  position: relative;
  z-index: 1;
}
.cta-banner .btn-primary:hover {
  background: var(--warm-white);
  box-shadow: 0 6px 24px rgba(0,0,0,0.18);
  transform: translateY(-2px);
}

/* === 页脚 === */
.site-footer {
  padding:60px 0 28px;
  background: #f5f0ea;
  color: var(--deep-brown);
  position: relative;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, var(--light-border) 20%, var(--light-border) 80%, transparent 100%);
}

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

.footer-brand { }
.footer-brand .logo {
  margin-bottom: 12px;
}
.footer-brand p {
  color: var(--warm-gray);
  font-size: 0.9rem;
  line-height: 1.7;
}

.footer-col h4 {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--deep-brown);
  letter-spacing: 0.5px;
}
.footer-col a {
  display: block;
  color: var(--warm-gray);
  text-decoration: none;
  font-size: 0.88rem;
  margin-bottom: 8px;
  transition: color 0.2s;
}
.footer-col a:hover {
  color: var(--terracotta);
}

.footer-bottom {
  border-top:1px solid rgba(0,0,0,0.06);
  margin-top:44px;
  padding-top:22px;
  text-align:center;
  font-size:0.85rem;
  color: var(--warm-gray);
}

/* === 工具类 === */
.text-accent {
  color: var(--terracotta);
}
.text-center {
  text-align:center;
}
.seo-description {
  max-width:600px;
  margin:0 auto 48px;
  opacity:0.7;
  color: var(--warm-gray);
  line-height: 1.7;
}
.mt-0 { margin-top:0; }
.mb-0 { margin-bottom:0; }

/* 额外的实用装饰 */
.text-sage {
  color: var(--sage-dark);
}
.divider-dot {
  display: inline-block;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--terracotta-light);
  margin: 0 8px;
  vertical-align: middle;
}

/* === 响应式 === */
@media (max-width: 1024px) {
  .hero h1 { font-size: 2.2rem; }
  .section-title { font-size: 1.7rem; }
  .feature-block { gap: 36px; }
}

@media (max-width: 768px) {
  .feature-block {
    grid-template-columns:1fr;
    gap: 32px;
  }
  .stats-bar {
    grid-template-columns:repeat(2,1fr);
  }
  .footer-grid {
    grid-template-columns:1fr 1fr;
    gap: 28px;
  }
  .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:rgba(253,251,248,0.97);
    backdrop-filter:blur(16px);
    -webkit-backdrop-filter:blur(16px);
    padding:24px;
    gap: 16px;
    border-bottom: 1px solid var(--light-border);
    box-shadow: 0 10px 30px rgba(59,50,46,0.08);
  }
  .main-nav.open a {
    font-size: 1rem;
    padding: 8px 0;
  }
  .main-nav.open .nav-cta {
    text-align: center;
    display: inline-block;
    margin-top: 8px;
  }
  .hero {
    min-height: 60vh;
  }
  .hero h1 {
    font-size: 2rem;
  }
  .hero p {
    font-size: 1rem;
  }
  .hero-buttons {
    flex-direction: column;
    gap: 10px;
  }
  .hero-buttons .btn {
    justify-content: center;
    width: 100%;
  }
  .section {
    padding: 56px 0;
  }
  .cta-banner {
    padding: 44px 20px;
  }
  .cta-banner h2 {
    font-size: 1.5rem;
  }
}

@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: 1.7rem;
  }
  .section-title {
    font-size: 1.4rem;
  }
  .stat-number {
    font-size: 1.8rem;
  }
  .container {
    padding: 0 16px;
  }
  .header-inner {
    padding: 0 16px;
  }
  .category-card {
    padding: 22px 18px;
  }
  .faq-item .faq-question {
    padding: 14px 16px;
    font-size: 0.9rem;
  }
}