/* ================================================================
   版主网 · diyibanzhu · banzhuwang.com.cn
   设计系统「社区织线 Community Thread」
   配色：暖奶油 #FBF7F2 · 松石绿 #0F6F69 · 珊瑚橘 #FF6B52 · 琥珀金 #F0B429
   语言：大胆排版 + 轻盈编织纹理 + 社区卡片语言
   ================================================================ */

:root {
  --bg: #FBF7F2;
  --bg-alt: #F2EDE5;
  --surface: #FFFFFF;
  --primary: #0F6F69;
  --primary-light: #268F87;
  --primary-lighter: #8FC7C0;
  --primary-bg: #E4F1EF;
  --accent: #FF6B52;
  --accent-light: #FFE4DD;
  --gold: #F0B429;
  --gold-light: #FBF0D3;
  --text: #21363A;
  --muted: rgba(33, 54, 58, 0.62);
  --border: rgba(33, 54, 58, 0.08);
  --shadow-sm: 0 2px 12px rgba(15, 111, 105, 0.06);
  --shadow-md: 0 8px 28px rgba(15, 111, 105, 0.09);
  --shadow-lg: 0 18px 48px rgba(15, 111, 105, 0.14);
  --radius-sm: 10px;
  --radius: 18px;
  --radius-lg: 28px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
  overflow-x: hidden;
  background-color: var(--bg);
  background-image: radial-gradient(rgba(15, 111, 105, 0.06) 1px, transparent 1px);
  background-size: 28px 28px;
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg);
}
::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--primary), var(--primary-light));
  border-radius: 10px;
}

/* ============================ 布局 ============================ */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

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

.section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 140px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, transparent, var(--primary-lighter), var(--gold), var(--accent), var(--primary-lighter), transparent);
  opacity: 0.5;
}

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

/* ============================ 导航 ============================ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(251, 247, 242, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow 0.3s ease;
}

.site-header:hover {
  box-shadow: var(--shadow-sm);
}

.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: 900;
  font-size: 1.25rem;
  text-decoration: none;
  color: var(--text);
  letter-spacing: -0.02em;
  transition: opacity 0.2s;
}

.logo:hover {
  opacity: 0.82;
}

.logo-icon {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  box-shadow: 0 4px 14px rgba(15, 111, 105, 0.32);
  position: relative;
  overflow: hidden;
}

.logo-icon::after {
  content: '';
  position: absolute;
  top: -30%;
  right: -30%;
  width: 60%;
  height: 60%;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
}

.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(--text);
  position: relative;
  padding: 6px 2px;
  transition: color 0.25s ease;
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--accent), var(--gold));
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

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

.main-nav a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav-cta {
  padding: 10px 24px !important;
  border-radius: 100px !important;
  color: #fff !important;
  font-weight: 600 !important;
  background: linear-gradient(135deg, var(--accent), #FF5340);
  box-shadow: 0 4px 14px rgba(255, 107, 82, 0.35);
  transition: transform 0.25s, box-shadow 0.25s !important;
}

.nav-cta::after {
  display: none;
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 22px rgba(255, 107, 82, 0.45) !important;
}

.menu-toggle {
  position: relative;
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  cursor: pointer;
  transition: background 0.2s;
}

.menu-toggle:hover {
  background: var(--primary-bg);
}

.menu-toggle::before,
.menu-toggle::after {
  content: '';
  position: absolute;
  left: 11px;
  width: 20px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.menu-toggle::before {
  top: 14px;
  box-shadow: 0 6px 0 var(--text);
}

.menu-toggle::after {
  top: 26px;
}

.menu-toggle.active::before {
  top: 20px;
  box-shadow: none;
  transform: rotate(45deg);
}

.menu-toggle.active::after {
  top: 20px;
  transform: rotate(-45deg);
}

/* ============================ Hero ============================ */

.hero {
  min-height: 88vh;
  display: flex;
  align-items: center;
  position: relative;
  padding-top: 68px;
  overflow: hidden;
  background:
    radial-gradient(ellipse at 85% 15%, rgba(255, 228, 221, 0.55) 0%, transparent 55%),
    radial-gradient(ellipse at 20% 85%, rgba(228, 241, 239, 0.65) 0%, transparent 50%),
    var(--bg);
}

.hero::before {
  content: '版';
  position: absolute;
  top: 12%;
  right: 6%;
  font-size: 340px;
  font-weight: 900;
  line-height: 1;
  color: rgba(15, 111, 105, 0.045);
  z-index: 0;
  pointer-events: none;
  user-select: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: 12%;
  right: 28%;
  width: 220px;
  height: 110px;
  background-image: radial-gradient(rgba(240, 180, 41, 0.35) 2px, transparent 2px);
  background-size: 16px 16px;
  opacity: 0.5;
  z-index: 0;
  pointer-events: none;
}

.hero .container {
  display: flex;
  align-items: center;
  gap: 56px;
  flex-wrap: wrap;
}

.hero-content {
  position: relative;
  z-index: 1;
  flex: 1 1 480px;
  max-width: 720px;
  padding: 20px 0;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 20px;
  background: var(--primary-bg);
  color: var(--primary);
}

.hero-eyebrow::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 2s ease-in-out infinite;
}

.hero h1 {
  font-size: clamp(2.3rem, 5.2vw, 4rem);
  line-height: 1.1;
  margin-bottom: 22px;
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--text);
}

.hero p {
  font-size: 1.12rem;
  opacity: 0.72;
  max-width: 560px;
  margin-bottom: 34px;
  line-height: 1.75;
}

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

.hero-image {
  position: relative;
  z-index: 1;
  flex: 1 1 380px;
  min-width: 300px;
  padding: 12px;
  border-radius: var(--radius-lg);
  background: linear-gradient(145deg, var(--surface) 0%, var(--primary-bg) 100%);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.hero-image::before {
  content: '';
  position: absolute;
  top: -24px;
  right: -24px;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gold-light), var(--accent-light));
  opacity: 0.65;
  z-index: 0;
}

.hero-image::after {
  content: '版通天下';
  position: absolute;
  bottom: 18px;
  left: 24px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.25em;
  color: var(--primary);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(4px);
  padding: 6px 14px;
  border-radius: 100px;
  z-index: 2;
  box-shadow: var(--shadow-sm);
}

.hero-image img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: calc(var(--radius-lg) - 8px);
  position: relative;
  z-index: 1;
  transition: transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.hero-image:hover img {
  transform: scale(1.02);
}

/* ============================ 按钮 ============================ */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 30px;
  border-radius: 100px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: all 0.28s cubic-bezier(0.22, 1, 0.36, 1);
  letter-spacing: 0.01em;
  line-height: 1;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: #fff;
  box-shadow: 0 4px 16px rgba(15, 111, 105, 0.3);
  position: relative;
  overflow: hidden;
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.25), transparent);
  transition: left 0.5s ease;
}

.btn-primary:hover::before {
  left: 100%;
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 28px rgba(15, 111, 105, 0.42);
}

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

.btn-outline:hover {
  background: var(--primary-bg);
  border-color: var(--primary-light);
  color: var(--primary);
  transform: translateY(-3px);
}

/* ============================ 标签 / 标题 ============================ */

.section-label {
  display: inline-block;
  padding: 5px 14px;
  border-radius: 100px;
  background: var(--primary-bg);
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.8rem, 3.6vw, 2.5rem);
  margin-bottom: 14px;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--text);
  position: relative;
}

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

.text-accent {
  color: var(--accent);
}

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

/* ============================ 卡片网格 ============================ */

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

.category-card {
  position: relative;
  border-radius: var(--radius);
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.35s, border-color 0.35s;
  overflow: hidden;
}

.category-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent), var(--gold));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

.category-card::after {
  content: '';
  position: absolute;
  bottom: -30px;
  right: -30px;
  width: 90px;
  height: 90px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(15, 111, 105, 0.06) 0%, transparent 70%);
  transition: transform 0.4s ease;
}

.category-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}

.category-card:hover::before {
  transform: scaleX(1);
}

.category-card:hover::after {
  transform: scale(1.3);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  font-size: 1.3rem;
  position: relative;
}

.category-card:nth-child(1) .card-icon {
  background: var(--primary-bg);
  color: var(--primary);
}

.category-card:nth-child(2) .card-icon {
  background: var(--accent-light);
  color: var(--accent);
}

.category-card:nth-child(3) .card-icon {
  background: var(--gold-light);
  color: #B8860B;
}

.category-card:nth-child(4) .card-icon {
  background: rgba(143, 184, 167, 0.18);
  color: #487A6A;
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-weight: 600;
  font-size: 0.85rem;
  text-decoration: none;
  color: var(--primary);
  transition: gap 0.25s ease;
}

.card-link::after {
  content: '→';
  font-size: 1em;
  transition: transform 0.25s ease;
}

.card-link:hover {
  gap: 8px;
}

/* ============================ 特性块 ============================ */

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

.feature-image {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
}

.feature-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(15, 111, 105, 0.08));
  pointer-events: none;
}

.feature-image img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.feature-image:hover img {
  transform: scale(1.035);
}

.feature-text {
  padding: 12px 0;
}

.feature-text h3 {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 16px;
  color: var(--text);
  letter-spacing: -0.01em;
}

.feature-text p {
  opacity: 0.72;
  margin-bottom: 20px;
  line-height: 1.7;
}

.feature-list {
  list-style: none;
  display: grid;
  gap: 6px;
}

.feature-list li {
  padding: 8px 0;
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 500;
  font-size: 0.98rem;
}

.feature-list li::before {
  content: '✓';
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-bg);
  color: var(--primary);
  border-radius: 50%;
  font-size: 11px;
  font-weight: 800;
  box-shadow: inset 0 0 0 1px rgba(15, 111, 105, 0.1);
}

/* ============================ 数据条 ============================ */

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

.stat-item {
  position: relative;
  padding: 32px 20px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  transition: transform 0.3s, box-shadow 0.3s;
  overflow: hidden;
}

.stat-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 44px;
  height: 4px;
  border-radius: 0 0 4px 4px;
}

.stat-item:nth-child(1)::before {
  background: var(--primary);
}

.stat-item:nth-child(2)::before {
  background: var(--accent);
}

.stat-item:nth-child(3)::before {
  background: var(--gold);
}

.stat-item:nth-child(4)::before {
  background: #7FA08F;
}

.stat-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.stat-number {
  font-size: 2.4rem;
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin-bottom: 8px;
}

.stat-item:nth-child(1) .stat-number {
  color: var(--primary);
}

.stat-item:nth-child(2) .stat-number {
  color: var(--accent);
}

.stat-item:nth-child(3) .stat-number {
  color: #C78A10;
}

.stat-item:nth-child(4) .stat-number {
  color: #5B8A79;
}

.stat-label {
  font-size: 0.9rem;
  opacity: 0.6;
  margin-top: 6px;
  font-weight: 500;
}

/* ============================ 内容墙 ============================ */

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

.content-wall-item {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--border);
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.35s;
}

.content-wall-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.content-wall-item img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  display: block;
  transition: transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.content-wall-item:hover img {
  transform: scale(1.06);
}

.content-wall-body {
  padding: 20px;
}

.content-wall-body h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
  line-height: 1.4;
  transition: color 0.25s;
}

.content-wall-item:hover .content-wall-body h4 {
  color: var(--primary);
}

.content-wall-body span {
  font-size: 0.8rem;
  color: var(--muted);
  display: inline-block;
  background: var(--primary-bg);
  padding: 3px 10px;
  border-radius: 100px;
  font-weight: 600;
}

/* ============================ FAQ ============================ */

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

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

.faq-item:hover {
  border-color: var(--primary-lighter);
}

.faq-item.open {
  box-shadow: var(--shadow-sm);
  border-color: var(--primary);
}

.faq-item .faq-question {
  padding: 18px 24px;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.95rem;
  color: var(--text);
}

.faq-item .faq-question::after {
  content: '+';
  font-size: 1.4rem;
  font-weight: 400;
  line-height: 1;
  transition: transform 0.3s ease;
  color: var(--primary);
  flex-shrink: 0;
}

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

.faq-item .faq-answer {
  padding: 0 24px 18px;
  display: none;
  opacity: 0.72;
  font-size: 0.93rem;
  line-height: 1.75;
}

.faq-item.open .faq-answer {
  display: block;
  animation: fadeIn 0.35s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 0.72;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.5;
    transform: scale(1.4);
  }
}

/* ============================ CTA横幅 ============================ */

.cta-banner {
  padding: 64px 24px;
  text-align: center;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 55%, #57A894 100%);
  color: #fff;
  position: relative;
  overflow: hidden;
  box-shadow: 0 16px 48px rgba(15, 111, 105, 0.25);
}

.cta-banner::before {
  content: '';
  position: absolute;
  top: -60px;
  right: -60px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.09);
}

.cta-banner::after {
  content: '';
  position: absolute;
  bottom: -80px;
  left: -50px;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.07);
}

.cta-banner h2 {
  color: #fff;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
  position: relative;
  z-index: 1;
}

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

.cta-banner .btn-primary {
  background: #fff;
  color: var(--primary);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
  position: relative;
  z-index: 1;
}

.cta-banner .btn-primary::before {
  background: linear-gradient(90deg, transparent, rgba(15, 111, 105, 0.12), transparent);
}

.cta-banner .btn-primary:hover {
  background: var(--accent-light);
  color: var(--primary);
  transform: translateY(-3px);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.18);
}

/* ============================ 页脚 ============================ */

.site-footer {
  padding: 60px 0 28px;
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-alt) 100%);
  border-top: 1px solid var(--border);
}

.site-footer .container {
  position: relative;
}

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

.footer-brand {
  padding-right: 20px;
}

.footer-brand .logo {
  margin-bottom: 14px;
}

.footer-brand p {
  font-size: 0.9rem;
  opacity: 0.62;
  max-width: 260px;
  line-height: 1.7;
}

.footer-col h4 {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 16px;
  color: var(--text);
  position: relative;
  padding-bottom: 8px;
}

.footer-col h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 28px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
}

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

.footer-col ul li {
  margin-bottom: 8px;
}

.footer-col ul li a {
  text-decoration: none;
  color: var(--muted);
  font-size: 0.9rem;
  transition: color 0.2s, padding-left 0.2s;
}

.footer-col ul li a:hover {
  color: var(--primary);
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid var(--border);
  margin-top: 40px;
  padding-top: 20px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--muted);
}

/* ============================ 工具类 ============================ */

.seo-description {
  max-width: 600px;
  margin: 0 auto 48px;
  opacity: 0.7;
  line-height: 1.7;
}

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

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

/* ============================ 响应式 ============================ */

@media (max-width: 992px) {
  .feature-block {
    gap: 40px;
  }
}

@media (max-width: 768px) {
  .hero {
    padding-top: 90px;
  }

  .hero .container {
    flex-direction: column;
    gap: 40px;
  }

  .hero-content {
    flex: 1 1 auto;
    text-align: center;
    max-width: 620px;
  }

  .hero p {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-buttons {
    justify-content: center;
  }

  .hero::before {
    font-size: 200px;
    top: 5%;
    right: 0;
  }

  .hero::after {
    display: none;
  }

  .hero-image {
    flex: 1 1 auto;
    min-width: 0;
    width: 100%;
    max-width: 520px;
  }

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

  .feature-text {
    padding: 0;
  }

  .feature-image {
    max-width: 100%;
  }

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

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

  .main-nav {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    width: 100%;
    background: var(--surface);
    padding: 24px;
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    border-radius: 0 0 var(--radius) var(--radius);
  }

  .main-nav.open {
    display: flex;
    animation: fadeIn 0.3s ease;
  }

  .main-nav a {
    font-size: 1rem;
    width: 100%;
    padding: 6px 0;
  }

  .nav-cta {
    margin-top: 8px;
  }

  .menu-toggle {
    display: flex;
  }

  .section {
    padding: 64px 0;
  }

  .section-title {
    font-size: 1.7rem;
  }
}

@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-buttons .btn {
    width: 100%;
    justify-content: center;
  }

  .section {
    padding: 56px 0;
  }

  .section-title {
    font-size: 1.5rem;
  }

  .feature-block {
    gap: 32px;
  }

  .stats-bar {
    gap: 16px;
  }

  .stat-number {
    font-size: 2rem;
  }

  .content-wall {
    gap: 16px;
  }

  .content-wall-item img {
    height: 180px;
  }

  .cta-banner {
    padding: 48px 20px;
  }

  .footer-grid {
    gap: 28px;
  }
}