```css
/* ================================================
   e站绿色版 ·  Botanical Modern Design System
   不染纤尘 · 纯净的绿色美学
   ================================================ */

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

:root {
  --ivory: #F6F4EE;
  --mint: #EBF3EE;
  --green: #2D8F5E;
  --green-dark: #1A6B40;
  --green-light: #5BAE86;
  --green-pale: #D4E8DC;
  --green-ghost: rgba(45, 143, 94, 0.06);
  --coral: #E8906E;
  --coral-pale: #F5D4C5;
  --text: #1B2E24;
  --text-soft: #5D7A6C;
  --text-faint: #8FA89C;
  --white: #FFFFFF;
  --border: rgba(45, 143, 94, 0.12);
  --shadow: 0 10px 40px rgba(45, 143, 94, 0.08);
  --shadow-lg: 0 24px 60px rgba(45, 143, 94, 0.14);
  --radius-organic: 30px 10px 30px 10px;
  --radius-organic-alt: 10px 30px 10px 30px;
  --radius-pill: 40px 12px 40px 12px;
}

html { scroll-behavior: smooth; }

body {
  font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  overflow-x: hidden;
  background: var(--ivory);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  font-size: 16px;
}

::selection { background: var(--green); color: var(--white); }

::-webkit-scrollbar { width: 9px; }
::-webkit-scrollbar-track { background: var(--ivory); }
::-webkit-scrollbar-thumb { background: var(--green-pale); border-radius: 6px; }
::-webkit-scrollbar-thumb:hover { background: var(--green-light); }

/* ============ 核心布局 ============ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 2;
}

.section {
  padding: 110px 0;
  position: relative;
  overflow: hidden;
}

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

.section::before {
  content: '';
  position: absolute;
  width: 460px;
  height: 460px;
  border-radius: 62% 38% 55% 45% / 50% 62% 38% 50%;
  background: var(--green-ghost);
  top: 50%;
  right: -160px;
  transform: translateY(-50%);
  pointer-events: none;
  z-index: 0;
}

.section:nth-child(even)::before {
  background: rgba(255, 255, 255, 0.35);
  left: -160px;
  right: auto;
}

/* ============ 导航 ============ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(246, 244, 238, 0.9);
  backdrop-filter: blur(18px) saturate(1.3);
  -webkit-backdrop-filter: blur(18px) saturate(1.3);
  border-bottom: 1px solid var(--border);
  transition: box-shadow 0.3s;
}

.site-header:hover { box-shadow: 0 4px 24px rgba(45, 143, 94, 0.06); }

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 1.25rem;
  text-decoration: none;
  color: var(--text);
  letter-spacing: -0.02em;
  transition: opacity 0.3s;
}

.logo:hover { opacity: 0.85; }

.logo-icon {
  width: 42px;
  height: 42px;
  border-radius: 16px 5px 16px 5px;
  background: linear-gradient(135deg, var(--green), var(--green-light));
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  font-weight: 800;
  box-shadow: 0 4px 16px rgba(45, 143, 94, 0.3);
  position: relative;
}

.logo-icon::after {
  content: '';
  position: absolute;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.25);
  top: 4px;
  right: 4px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.main-nav a {
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-soft);
  transition: color 0.3s;
  position: relative;
  letter-spacing: 0.02em;
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--green);
  border-radius: 3px;
  transition: width 0.35s ease;
}

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

.nav-cta {
  padding: 11px 26px;
  border-radius: var(--radius-pill);
  background: linear-gradient(135deg, var(--green), var(--green-dark));
  color: var(--white) !important;
  font-weight: 600 !important;
  box-shadow: 0 4px 18px rgba(45, 143, 94, 0.3);
  transition: transform 0.3s, box-shadow 0.3s;
}

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

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(45, 143, 94, 0.4);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 10px;
  border-radius: 10px;
  transition: background 0.3s;
}

.menu-toggle:hover { background: var(--green-pale); }

.menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 3px;
  transition: transform 0.3s, opacity 0.3s;
}

.menu-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.open span:nth-child(2) { opacity: 0; }
.menu-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============ Hero ============ */
.hero {
  min-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 60px;
  padding: 100px 48px;
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(ellipse at 88% 18%, rgba(212, 232, 220, 0.5) 0%, transparent 55%),
    radial-gradient(ellipse at 5% 80%, rgba(245, 212, 197, 0.3) 0%, transparent 40%),
    var(--ivory);
}

.hero::before {
  content: '';
  position: absolute;
  width: 700px;
  height: 700px;
  border-radius: 58% 42% 62% 38% / 52% 60% 40% 48%;
  background: linear-gradient(135deg, rgba(45, 143, 94, 0.05), rgba(45, 143, 94, 0.01));
  top: 50%;
  right: -180px;
  transform: translateY(-50%);
  z-index: 0;
  animation: float 8s ease-in-out infinite alternate;
}

.hero::after {
  content: '❋';
  position: absolute;
  right: 6%;
  top: 12%;
  font-size: 14rem;
  color: rgba(45, 143, 94, 0.05);
  z-index: 0;
  line-height: 1;
  animation: spinSlow 30s linear infinite;
}

@keyframes float {
  0% { transform: translateY(-50%) scale(1); }
  100% { transform: translateY(-60%) scale(1.05); }
}

@keyframes spinSlow {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.hero-content {
  flex: 1;
  max-width: 620px;
  position: relative;
  z-index: 2;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 6px 18px;
  border-radius: var(--radius-pill);
  background: var(--green-pale);
  color: var(--green-dark);
  margin-bottom: 22px;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.6);
}

.hero-eyebrow::before {
  content: '🌿';
  font-size: 0.85rem;
  margin-right: 2px;
}

.hero h1 {
  font-size: 3.4rem;
  line-height: 1.12;
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: 24px;
  color: var(--text);
}

.hero h1 .accent {
  color: var(--green);
  position: relative;
  display: inline-block;
  z-index: 0;
}

.hero h1 .accent::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: -2px;
  width: calc(100% + 4px);
  height: 10px;
  background: var(--green-pale);
  border-radius: 6px;
  z-index: -1;
  opacity: 0.7;
}

.hero p {
  font-size: 1.08rem;
  color: var(--text-soft);
  line-height: 1.75;
  max-width: 540px;
  margin-bottom: 36px;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-image {
  flex: 1;
  max-width: 520px;
  position: relative;
  z-index: 2;
  border-radius: var(--radius-organic);
  overflow: hidden;
  border: 5px solid rgba(255, 255, 255, 0.5);
  box-shadow: var(--shadow-lg);
  transform: rotate(1.2deg);
  transition: transform 0.5s ease, box-shadow 0.5s;
}

.hero-image:hover {
  transform: rotate(0deg) scale(1.015);
  box-shadow: 0 30px 70px rgba(45, 143, 94, 0.2);
}

.hero-image img {
  width: 100%;
  height: 480px;
  object-fit: cover;
  display: block;
}

.hero-image::before {
  content: '✦ 100% Pure';
  position: absolute;
  top: 18px;
  left: 18px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(8px);
  padding: 6px 14px;
  border-radius: 30px 6px 30px 6px;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--green);
  z-index: 3;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}

.hero-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 70%, rgba(45, 143, 94, 0.08));
  pointer-events: none;
}

/* ============ 按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: 0.92rem;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: all 0.3s ease;
  letter-spacing: 0.01em;
  line-height: 1.4;
}

.btn-primary {
  background: linear-gradient(135deg, var(--green), var(--green-dark));
  color: var(--white);
  box-shadow: 0 4px 20px rgba(45, 143, 94, 0.35);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 32px rgba(45, 143, 94, 0.45);
}

.btn-outline {
  background: transparent;
  border: 1.5px solid var(--green);
  color: var(--green);
}

.btn-outline:hover {
  background: rgba(45, 143, 94, 0.08);
  border-color: var(--green-dark);
  color: var(--green-dark);
  transform: translateY(-3px);
}

/* ============ 标签 / 标题 ============ */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: 14px;
  color: var(--green);
}

.section-label::before {
  content: '✦';
  font-size: 0.9rem;
  color: var(--coral);
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 16px;
  line-height: 1.2;
  position: relative;
}

.section-desc {
  max-width: 620px;
  color: var(--text-soft);
  font-size: 1.02rem;
  line-height: 1.75;
  margin-bottom: 48px;
  opacity: 0.9;
}

/* ============ 卡片网格 ============ */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 30px;
}

.category-card {
  background: var(--white);
  border-radius: var(--radius-organic);
  padding: 34px 30px;
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
  transition: transform 0.4s ease, box-shadow 0.4s ease, border-color 0.3s;
  z-index: 1;
}

.category-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--green), var(--green-light), transparent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.category-card::after {
  content: '';
  position: absolute;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--green-pale), transparent 70%);
  bottom: -40px;
  right: -40px;
  opacity: 0.4;
  transition: opacity 0.4s, transform 0.4s;
  pointer-events: none;
}

.category-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow);
  border-color: rgba(45, 143, 94, 0.25);
}

.category-card:hover::before { transform: scaleX(1); }
.category-card:hover::after { opacity: 0.7; transform: scale(1.3); }

.card-icon {
  width: 56px;
  height: 56px;
  border-radius: 18px 5px 18px 5px;
  background: linear-gradient(135deg, var(--green-pale), var(--mint));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  font-size: 1.5rem;
  position: relative;
  z-index: 1;
  box-shadow: 0 2px 8px rgba(45, 143, 94, 0.06);
}

.card-link {
  font-weight: 700;
  font-size: 0.85rem;
  text-decoration: none;
  color: var(--green);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap 0.3s, color 0.3s;
  position: relative;
  z-index: 1;
}

.card-link::after {
  content: '→';
  font-size: 1.1rem;
}

.card-link:hover { gap: 10px; color: var(--green-dark); }

/* ============ 特性块 ============ */
.feature-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 2;
}

.feature-image {
  border-radius: var(--radius-organic-alt);
  overflow: hidden;
  border: 5px solid rgba(255, 255, 255, 0.65);
  box-shadow: var(--shadow);
  position: relative;
}

.feature-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 50%, rgba(45, 143, 94, 0.06));
  pointer-events: none;
}

.feature-image img {
  width: 100%;
  height: 380px;
  object-fit: cover;
  display: block;
  transition: transform 0.6s ease;
}

.feature-image:hover img { transform: scale(1.03); }

.feature-text { padding: 20px 0; }

.feature-list {
  list-style: none;
  margin-top: 24px;
}

.feature-list li {
  padding: 9px 0;
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 0.98rem;
  color: var(--text-soft);
  transition: color 0.3s;
}

.feature-list li:hover { color: var(--text); }

.feature-list li::before {
  content: '✓';
  font-weight: 800;
  color: var(--white);
  background: linear-gradient(135deg, var(--green), var(--green-light));
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(45, 143, 94, 0.25);
}

/* ============ 数据条 ============ */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  text-align: center;
  position: relative;
  z-index: 2;
}

.stat-item {
  background: var(--white);
  padding: 38px 24px;
  border-radius: var(--radius-organic);
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
  transition: transform 0.35s ease, box-shadow 0.35s;
}

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

.stat-item::before {
  content: '✦';
  position: absolute;
  top: 12px;
  right: 16px;
  font-size: 1.2rem;
  color: var(--green-pale);
}

.stat-item::after {
  content: '';
  position: absolute;
  width: 70px;
  height: 70px;
  border-radius: 50%;
  background: var(--green-ghost);
  top: -20px;
  right: -20px;
  transition: transform 0.4s;
}

.stat-item:hover::after { transform: scale(1.4); }

.stat-number {
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1.1;
  background: linear-gradient(135deg, var(--green), var(--green-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: inline-block;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-soft);
  margin-top: 10px;
  font-weight: 500;
  letter-spacing: 0.03em;
}

/* ============ 内容墙 ============ */
.content-wall {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 30px;
}

.content-wall-item {
  background: var(--white);
  border-radius: var(--radius-organic);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: transform 0.4s ease, box-shadow 0.4s ease;
  position: relative;
}

.content-wall-item:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow);
}

.content-wall-item:nth-child(2n) {
  border-radius: var(--radius-organic-alt);
}

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

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

.content-wall-body {
  padding: 24px;
}

.content-wall-body h3 {
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
  transition: color 0.3s;
}

.content-wall-item:hover h3 { color: var(--green); }

.content-wall-body p {
  font-size: 0.88rem;
  color: var(--text-soft);
  line-height: 1.6;
}

/* ============ FAQ ============ */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.faq-item {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-organic);
  margin-bottom: 14px;
  overflow: hidden;
  cursor: pointer;
  transition: box-shadow 0.3s, border-color 0.3s;
}

.faq-item:nth-child(2n) {
  border-radius: var(--radius-organic-alt);
}

.faq-item:hover {
  box-shadow: 0 4px 20px rgba(45, 143, 94, 0.08);
  border-color: rgba(45, 143, 94, 0.25);
}

.faq-item.open {
  box-shadow: var(--shadow);
  border-color: rgba(45, 143, 94, 0.3);
}

.faq-item .faq-question {
  padding: 20px 26px;
  font-weight: 600;
  font-size: 1rem;
  color: var(--text);
  display: flex;
  justify-content: space-between;
  align-items: center;
  letter-spacing: 0.01em;
  transition: color 0.3s;
}

.faq-item:hover .faq-question { color: var(--green); }

.faq-item .faq-question::after {
  content: '+';
  font-size: 1.5rem;
  font-weight: 300;
  color: var(--green);
  transition: transform 0.35s ease, color 0.3s;
  line-height: 1;
}

.faq-item.open .faq-question::after {
  transform: rotate(135deg);
  color: var(--coral);
}

.faq-item .faq-answer {
  padding: 0 26px 22px;
  display: none;
  color: var(--text-soft);
  font-size: 0.95rem;
  line-height: 1.75;
  border-top: 1px solid var(--border);
  margin-top: 2px;
  padding-top: 16px;
}

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

@keyframes fadeSlide {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============ CTA 横幅 ============ */
.cta-banner {
  padding: 68px 56px;
  text-align: center;
  border-radius: var(--radius-organic-alt);
  color: var(--white);
  background: linear-gradient(135deg, var(--green) 0%, var(--green-dark) 50%, #145A38 100%);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.cta-banner::before {
  content: '❋';
  position: absolute;
  right: 4%;
  top: 50%;
  transform: translateY(-50%);
  font-size: 10rem;
  opacity: 0.07;
  line-height: 1;
  animation: spinSlow 20s linear infinite;
}

.cta-banner::after {
  content: '🌿';
  position: absolute;
  left: 5%;
  bottom: 10%;
  font-size: 5rem;
  opacity: 0.12;
  line-height: 1;
}

.cta-banner h2 {
  color: var(--white);
  font-size: 2.2rem;
  margin-bottom: 14px;
  font-weight: 800;
  letter-spacing: -0.02em;
  position: relative;
  z-index: 1;
}

.cta-banner p {
  max-width: 520px;
  margin: 0 auto 30px;
  opacity: 0.85;
  font-size: 1rem;
  line-height: 1.7;
  position: relative;
  z-index: 1;
}

.cta-banner .btn-primary {
  background: var(--white);
  color: var(--green-dark);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.15);
  position: relative;
  z-index: 1;
}

.cta-banner .btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.2);
}

/* ============ 页脚 ============ */
.site-footer {
  background: linear-gradient(135deg, #2D8F5E, #1C6B42);
  padding: 60px 0 30px;
  color: rgba(255, 255, 255, 0.9);
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: '❋';
  position: absolute;
  right: 3%;
  top: 10%;
  font-size: 12rem;
  opacity: 0.04;
  line-height: 1;
  animation: spinSlow 40s linear infinite;
}

.site-footer::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 44px;
  position: relative;
  z-index: 2;
}

.footer-brand { max-width: 300px; }

.footer-brand .logo {
  color: var(--white);
  margin-bottom: 16px;
}

.footer-brand .logo-icon {
  background: rgba(255, 255, 255, 0.2);
  box-shadow: none;
  backdrop-filter: blur(6px);
}

.footer-brand p {
  font-size: 0.9rem;
  opacity: 0.8;
  line-height: 1.7;
  margin-top: 12px;
}

.footer-col h4 {
  color: var(--white);
  font-size: 0.98rem;
  margin-bottom: 18px;
  font-weight: 700;
  position: relative;
  display: inline-block;
}

.footer-col h4::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 24px;
  height: 2px;
  background: rgba(255, 255, 255, 0.4);
  border-radius: 2px;
}

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

.footer-col ul li {
  margin-bottom: 11px;
}

.footer-col ul a {
  color: rgba(255, 255, 255, 0.75);
  text-decoration: none;
  font-size: 0.88rem;
  transition: color 0.3s, padding-left 0.3s;
  display: inline-block;
}

.footer-col ul a:hover {
  color: var(--white);
  padding-left: 6px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  margin-top: 44px;
  padding-top: 22px;
  text-align: center;
  font-size: 0.85rem;
  opacity: 0.65;
  position: relative;
  z-index: 2;
}

/* ============ 工具类 ============ */
.text-accent { color: var(--coral); }

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

.seo-description {
  max-width: 600px;
  margin: 0 auto 52px;
  color: var(--text-soft);
  opacity: 0.95;
  line-height: 1.75;
  font-size: 1rem;
}

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

.section-title.text-center {
  margin-left: auto;
  margin-right: auto;
}

.section-desc.text-center {
  margin-left: auto;
  margin-right: auto;
}

/* ============ 响应式 ============ */
@media (max-width: 992px) {
  .hero {
    flex-direction: column;
    gap: 48px;
    padding: 110px 24px 60px;
  }
  
  .hero-content { max-width: 100%; }
  .hero-image { max-width: 100%; width: 100%; }
  .hero-image img { height: 360px; }
  
  .hero h1 { font-size: 2.6rem; }
  
  .feature-block { gap: 40px; }
  
  .cta-banner { padding: 50px 32px; }
}

@media (max-width: 768px) {
  .feature-block {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  
  .main-nav {
    display: none;
  }
  
  .menu-toggle {
    display: flex;
  }
  
  .main-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 74px;
    left: 0;
    width: 100%;
    background: var(--ivory);
    padding: 28px 24px;
    gap: 20px;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.08);
    z-index: 999;
    animation: fadeSlide 0.3s ease;
  }
  
  .main-nav.open a {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    padding: 6px 0;
  }
  
  .main-nav.open .nav-cta {
    margin-top: 8px;
    text-align: center;
  }
  
  .hero h1 { font-size: 2.2rem; }
  .hero p { font-size: 1rem; }
  .hero-image img { height: 300px; }
  
  .section { padding: 72px 0; }
  .section-title { font-size: 1.9rem; }
  
  .stat-number { font-size: 2.2rem; }
  
  .cta-banner h2 { font-size: 1.6rem; }
  
  .cta-banner {
    padding: 44px 24px;
    border-radius: 20px 6px 20px 6px;
  }
  
  .content-wall {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 20px;
  }
}

@media (max-width: 480px) {
  .cards-grid,
  .content-wall,
  .stats-bar {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  
  .hero-buttons {
    flex-direction: column;
    align-items: stretch;
  }
  
  .hero-buttons .btn {
    justify-content: center;
    width: 100%;
  }
  
  .hero h1 {
    font-size: 1.8rem;
  }
  
  .hero-image img {
    height: 220px;
  }
  
  .section-title {
    font-size: 1.45rem;
  }
  
  .stat-number {
    font-size: 1.8rem;
  }
  
  .header-inner {
    height: 64px;
  }
  
  .main-nav.open {
    top: 64px;
  }
  
  .logo {
    font-size: 1.05rem;
  }
  
  .logo-icon {
    width: 36px;
    height: 36px;
    font-size: 1rem;
  }
  
  .btn {
    padding: 13px 24px;
    font-size: 0.88rem;
  }
  
  .section {
    padding: 56px 0;
  }
  
  .cta-banner {
    padding: 36px 20px;
  }
  
  .cta-banner h2 {
    font-size: 1.35rem;
  }
  
  .faq-item .faq-question {
    padding: 16px 18px;
    font-size: 0.9rem;
  }
  
  .faq-item .faq-answer {
    padding: 0 18px 16px;
    font-size: 0.88rem;
  }
  
  .feature-image img {
    height: 260px;
  }
  
  .footer-bottom {
    font-size: 0.78rem;
  }
}