/* =============================================
   NANGONG DESIGN SYSTEM v1.0
   "一步一世界" — 南宫导航
   风格：东方禅意 · 水墨留白 · 光晕渐变
   背景：米白基底 + 浅灰蓝点缀
   色彩：石青(#5b8c7a) + 朱砂(#c25a3c) + 金箔(#d4a853)
   ============================================= */

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

body {
  font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  overflow-x:hidden;
  background: #f7f4ef;
  color: #2c2c2c;
  line-height: 1.6;
}

::selection {
  background: #5b8c7a;
  color: #fff;
}

/* ── 容器 ── */
.container { max-width:1200px; margin:0 auto; padding:0 24px; }

.section { padding:80px 0; position:relative; }
.section:nth-child(even) { background:#f0ece6; }

/* ── 导航 ── */
.site-header {
  position:fixed; top:0; left:0; width:100%; z-index:1000;
  background:rgba(247,244,239,0.92);
  backdrop-filter:blur(12px);
  border-bottom:1px solid rgba(91,140,122,0.15);
}

.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:#2c2c2c; letter-spacing:1px;
}

.logo-icon {
  width:38px; height:38px; border-radius:50%;
  display:flex; align-items:center; justify-content:center;
  background: linear-gradient(135deg, #5b8c7a, #8fb5a3);
  color:#fff; font-size:1.1rem;
  box-shadow: 0 2px 12px rgba(91,140,122,0.25);
}

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

.main-nav a {
  text-decoration:none; font-size:0.9rem; font-weight:500;
  color:#4a4a4a; transition:0.3s ease;
  position:relative;
}

.main-nav a::after {
  content:''; position:absolute; left:0; bottom:-4px;
  width:0; height:2px; background:#c25a3c;
  transition:width 0.3s ease;
}

.main-nav a:hover { color:#5b8c7a; }
.main-nav a:hover::after { width:100%; }

.nav-cta {
  padding:8px 24px; border-radius:50px;
  color:#fff !important; font-weight:600;
  background: linear-gradient(135deg, #5b8c7a, #3f6b5c);
  box-shadow: 0 2px 10px rgba(91,140,122,0.3);
  transition:0.3s ease;
}

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

.nav-cta:hover {
  transform:translateY(-1px);
  box-shadow: 0 4px 20px rgba(91,140,122,0.4);
  color:#fff !important;
}

.menu-toggle { display:none; }

/* ── Hero ── */
.hero {
  min-height:85vh; display:flex; align-items:center;
  position:relative; overflow:hidden;
  background: linear-gradient(135deg, #f7f4ef 0%, #e8e2d8 100%);
}

.hero::before {
  content:''; position:absolute; top:-30%; right:-10%;
  width:600px; height:600px;
  background: radial-gradient(circle, rgba(91,140,122,0.08) 0%, transparent 70%);
  border-radius:50%;
}

.hero::after {
  content:''; position:absolute; bottom:-20%; left:-5%;
  width:400px; height:400px;
  background: radial-gradient(circle, rgba(194,90,60,0.06) 0%, transparent 70%);
  border-radius:50%;
}

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

.hero-eyebrow {
  display:inline-block; font-size:0.8rem; font-weight:600;
  letter-spacing:3px; text-transform:uppercase;
  padding:6px 18px; border-radius:50px;
  background: rgba(91,140,122,0.1);
  color:#5b8c7a; margin-bottom:20px;
  border:1px solid rgba(91,140,122,0.2);
}

.hero h1 {
  font-size:3.2rem; line-height:1.15; margin-bottom:20px;
  font-weight:800; letter-spacing:-0.5px;
  background: linear-gradient(135deg, #2c2c2c, #5b8c7a);
  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
  background-clip:text;
}

.hero p {
  font-size:1.15rem; opacity:0.7; max-width:560px; margin-bottom:36px;
  color:#555; line-height:1.7;
}

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

.hero-image {
  border-radius:16px; overflow:hidden;
  box-shadow: 0 8px 40px rgba(0,0,0,0.06);
  position:relative; z-index:2;
}

.hero-image img { width:100%; height:auto; display:block; }

/* ── 按钮 ── */
.btn {
  display:inline-flex; align-items:center; gap:8px;
  padding:12px 32px; border-radius:50px;
  font-weight:600; cursor:pointer; border:none;
  text-decoration:none; transition:0.3s ease;
  font-size:0.95rem;
}

.btn-primary {
  color:#fff;
  background: linear-gradient(135deg, #c25a3c, #a84a2e);
  box-shadow: 0 2px 12px rgba(194,90,60,0.25);
}

.btn-primary:hover {
  transform:translateY(-2px);
  box-shadow: 0 6px 24px rgba(194,90,60,0.35);
}

.btn-outline {
  background:transparent; border:1.5px solid #5b8c7a;
  color:#5b8c7a; transition:0.3s ease;
}

.btn-outline:hover {
  background:rgba(91,140,122,0.08);
  transform:translateY(-2px);
}

/* ── 标签/标题 ── */
.section-label {
  display:inline-block; font-size:0.75rem; font-weight:600;
  letter-spacing:3px; text-transform:uppercase;
  padding:4px 16px; border-radius:50px;
  background: rgba(212,168,83,0.12);
  color:#b8943e; margin-bottom:14px;
}

.section-title {
  font-size:2.2rem; margin-bottom:12px;
  font-weight:700; letter-spacing:-0.3px;
  color:#2c2c2c;
}

.section-desc {
  max-width:600px; opacity:0.65; margin-bottom:44px;
  font-size:1.05rem; color:#666;
}

/* ── 卡片网格 ── */
.cards-grid {
  display:grid; grid-template-columns:repeat(auto-fill,minmax(280px,1fr));
  gap:28px;
}

.category-card {
  border-radius:16px; padding:32px 28px;
  background:#fff; border:1px solid rgba(0,0,0,0.04);
  transition:0.4s cubic-bezier(0.25,0.46,0.45,0.94);
  position:relative; overflow:hidden;
}

.category-card::before {
  content:''; position:absolute; top:0; left:0;
  width:100%; height:3px;
  background: linear-gradient(90deg, #5b8c7a, #d4a853);
  opacity:0; transition:0.4s;
}

.category-card:hover {
  transform:translateY(-6px);
  box-shadow:0 12px 40px rgba(91,140,122,0.1);
  border-color:transparent;
}

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

.card-icon {
  width:52px; height:52px; border-radius:14px;
  display:flex; align-items:center; justify-content:center;
  margin-bottom:18px; font-size:1.5rem;
  background: linear-gradient(135deg, #f0ece6, #e8e2d8);
  color:#5b8c7a;
}

.card-link {
  font-weight:600; font-size:0.85rem; text-decoration:none;
  color:#c25a3c; display:inline-flex; align-items:center; gap:6px;
  transition:0.3s;
}

.card-link:hover { gap:10px; color:#a84a2e; }

/* ── 特性块 ── */
.feature-block {
  display:grid; grid-template-columns:1fr 1fr; gap:64px; align-items:center;
}

.feature-image {
  border-radius:16px; overflow:hidden;
  box-shadow: 0 4px 24px rgba(0,0,0,0.04);
}

.feature-image img { width:100%; height:auto; display:block; }

.feature-text { }
.feature-text .section-title { font-size:1.8rem; }

.feature-list { list-style:none; }
.feature-list li {
  padding:8px 0; display:flex; align-items:center; gap:10px;
  font-size:0.95rem; color:#555;
}

.feature-list li::before {
  content:'✦'; font-weight:700; color:#d4a853;
  font-size:0.8rem;
}

/* ── 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:16px;
  background:#fff; border:1px solid rgba(0,0,0,0.04);
  transition:0.3s;
}

.stat-item:hover {
  transform:translateY(-3px);
  box-shadow:0 8px 30px rgba(91,140,122,0.08);
}

.stat-number {
  font-size:2.6rem; font-weight:800;
  background: linear-gradient(135deg, #5b8c7a, #3f6b5c);
  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
  background-clip:text;
}

.stat-label {
  font-size:0.9rem; opacity:0.55; margin-top:8px;
  letter-spacing:1px;
}

/* ── 内容墙 ── */
.content-wall {
  display:grid; grid-template-columns:repeat(auto-fill,minmax(300px,1fr));
  gap:28px;
}

.content-wall-item {
  border-radius:16px; overflow:hidden;
  background:#fff; border:1px solid rgba(0,0,0,0.04);
  transition:0.4s cubic-bezier(0.25,0.46,0.45,0.94);
}

.content-wall-item:hover {
  transform:translateY(-6px);
  box-shadow:0 12px 40px rgba(91,140,122,0.1);
}

.content-wall-item img {
  width:100%; height:220px; object-fit:cover;
  transition:0.6s;
}

.content-wall-item:hover img { transform:scale(1.03); }

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

.content-wall-body h3 {
  font-size:1.1rem; margin-bottom:8px; font-weight:600;
}

.content-wall-body p {
  font-size:0.9rem; opacity:0.6; line-height:1.6;
}

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

.faq-item {
  border:1px solid rgba(0,0,0,0.06);
  border-radius:12px; margin-bottom:10px;
  overflow:hidden; cursor:pointer;
  background:#fff; transition:0.3s;
}

.faq-item:hover { border-color:rgba(91,140,122,0.2); }

.faq-item .faq-question {
  padding:18px 24px; font-weight:600;
  display:flex; justify-content:space-between;
  align-items:center; font-size:1rem;
  color:#2c2c2c;
}

.faq-item .faq-question::after {
  content:'+'; font-size:1.2rem; color:#5b8c7a;
  transition:0.3s;
}

.faq-item.open .faq-question::after { content:'−'; }

.faq-item .faq-answer {
  padding:0 24px 20px; display:none;
  opacity:0.7; line-height:1.7; font-size:0.95rem;
}

.faq-item.open .faq-answer { display:block; }

/* ── CTA横幅 ── */
.cta-banner {
  padding:64px 32px; text-align:center;
  border-radius:20px;
  background: linear-gradient(135deg, #5b8c7a, #3f6b5c, #2c5a4a);
  color:#fff; position:relative; overflow:hidden;
}

.cta-banner::before {
  content:''; position:absolute; top:-40%; right:-20%;
  width:500px; height:500px;
  background: radial-gradient(circle, rgba(212,168,83,0.1) 0%, transparent 70%);
  border-radius:50%;
}

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

.cta-banner p {
  opacity:0.8; margin-bottom:28px; position:relative; z-index:2;
}

.cta-banner .btn-primary {
  background:#fff; color:#5b8c7a;
  box-shadow: 0 2px 16px rgba(0,0,0,0.1);
}

.cta-banner .btn-primary:hover {
  background:#f7f4ef; transform:translateY(-2px);
  box-shadow: 0 6px 24px rgba(0,0,0,0.15);
}

/* ── 页脚 ── */
.site-footer {
  padding:64px 0 32px;
  background: #2c2c2c;
  color: rgba(255,255,255,0.7);
}

.footer-grid {
  display:grid; grid-template-columns:2fr 1fr 1fr 1fr; gap:48px;
}

.footer-brand h3 {
  color:#fff; font-size:1.2rem; margin-bottom:12px;
}

.footer-brand p {
  font-size:0.9rem; opacity:0.6; line-height:1.7;
}

.footer-col h4 {
  color:#fff; font-size:0.9rem; margin-bottom:16px;
  letter-spacing:1px;
}

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

.footer-col ul li {
  padding:4px 0; font-size:0.85rem; opacity:0.6;
  transition:0.3s; cursor:pointer;
}

.footer-col ul li:hover { opacity:1; color:#d4a853; }

.footer-bottom {
  border-top:1px solid rgba(255,255,255,0.06);
  margin-top:48px; padding-top:24px;
  text-align:center; font-size:0.8rem; opacity:0.4;
}

/* ── 工具类 ── */
.text-accent { color:#c25a3c; }
.text-center { text-align:center; }

.seo-description {
  max-width:600px; margin:0 auto 48px; opacity:0.6;
  font-size:0.95rem; line-height:1.7;
}

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

/* ── 装饰元素 ── */
.section-divider {
  width:60px; height:2px;
  background: linear-gradient(90deg, #5b8c7a, #d4a853);
  margin:0 auto 24px; border-radius:2px;
}

/* ── 响应式 ── */
@media (max-width: 768px) {
  .hero h1 { font-size:2.2rem; }
  .feature-block { grid-template-columns:1fr; gap:40px; }
  .stats-bar { grid-template-columns:repeat(2,1fr); }
  .footer-grid { grid-template-columns:1fr 1fr; gap:32px; }
  .main-nav { display:none; }
  .menu-toggle { display:flex; }

  .menu-toggle {
    width:40px; height:40px; border:none; background:transparent;
    cursor:pointer; flex-direction:column; align-items:center;
    justify-content:center; gap:5px;
  }

  .menu-toggle span {
    display:block; width:24px; height:2px;
    background:#2c2c2c; border-radius:2px;
    transition:0.3s;
  }

  .main-nav.open {
    display:flex; flex-direction:column;
    position:absolute; top:68px; left:0; width:100%;
    background:rgba(247,244,239,0.98);
    backdrop-filter:blur(12px);
    padding:24px 32px; gap:16px;
    border-bottom:1px solid rgba(91,140,122,0.1);
  }
}

@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:1.8rem; }
  .section-title { font-size:1.5rem; }
  .cta-banner { padding:40px 20px; }
  .cta-banner h2 { font-size:1.4rem; }
}