/* ========== 一问就来GEO 品牌样式 ========== */
:root {
  --purple: #5B2D8E;
  --purple-light: #7B4FAD;
  --purple-dark: #451F6E;
  --orange: #F47920;
  --orange-light: #FF9A4D;
  --blue: #1A365D;
  --blue-light: #2A4A7F;
  --gray-50: #F9FAFB;
  --gray-100: #F3F4F6;
  --gray-200: #E5E7EB;
  --gray-300: #D1D5DB;
  --gray-500: #6B7280;
  --gray-700: #374151;
  --gray-900: #111827;
  --white: #FFFFFF;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,.08);
  --shadow-lg: 0 10px 30px rgba(0,0,0,.1);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: all .3s ease;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; color: var(--gray-700); line-height: 1.7; background: var(--white); }
a { color: var(--purple); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--orange); }
img { max-width: 100%; height: auto; }
h1,h2,h3,h4,h5,h6 { color: var(--gray-900); line-height: 1.3; font-weight: 700; }

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

/* ========== 导航栏 ========== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(255,255,255,.95); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--gray-200);
  transition: var(--transition);
}
.navbar.scrolled { box-shadow: var(--shadow-md); }
.nav-container { display: flex; align-items: center; justify-content: space-between; height: 72px; }

.logo { display: flex; align-items: center; gap: 10px; font-size: 20px; font-weight: 700; color: var(--gray-900) !important; }
.logo:hover { color: var(--gray-900) !important; }
.logo-icon {
  width: 40px; height: 40px; border-radius: 10px;
  background: linear-gradient(135deg, var(--purple), var(--orange));
  color: white; display: flex; align-items: center; justify-content: center;
  font-size: 18px; font-weight: 800;
}
.logo-accent { color: var(--orange); }

.nav-links { display: flex; align-items: center; gap: 8px; list-style: none; }
.nav-links a { padding: 8px 16px; border-radius: var(--radius-sm); color: var(--gray-700); font-size: 15px; font-weight: 500; }
.nav-links a:hover, .nav-links a.active { color: var(--purple); background: rgba(91,45,142,.06); }

.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--gray-700); margin: 5px 0; transition: var(--transition); }

/* ========== 按钮 ========== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 28px; border-radius: var(--radius-sm); font-size: 15px; font-weight: 600;
  border: 2px solid transparent; cursor: pointer; transition: var(--transition);
  text-decoration: none !important;
}
.btn-primary { background: linear-gradient(135deg, var(--purple), var(--purple-light)); color: white; border-color: var(--purple); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(91,45,142,.3); color: white !important; }
.btn-orange { background: linear-gradient(135deg, var(--orange), var(--orange-light)); color: white; border-color: var(--orange); }
.btn-orange:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(244,121,32,.3); color: white !important; }
.btn-outline { background: transparent; color: var(--purple); border-color: var(--purple); }
.btn-outline:hover { background: var(--purple); color: white !important; }
.btn-white { background: white; color: var(--purple); border-color: white; }
.btn-white:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(255,255,255,.3); color: var(--purple) !important; }
.btn-nav { background: linear-gradient(135deg, var(--orange), var(--orange-light)); color: white !important; padding: 8px 20px; font-size: 14px; }
.btn-nav:hover { color: white !important; }
.btn-lg { padding: 16px 36px; font-size: 16px; }
.btn-sm { padding: 8px 18px; font-size: 13px; }

/* ========== Hero区 ========== */
.hero {
  min-height: 100vh; display: flex; align-items: center;
  background: linear-gradient(135deg, var(--blue) 0%, var(--purple) 50%, var(--purple-dark) 100%);
  position: relative; overflow: hidden; padding-top: 72px;
}
.hero::before {
  content: ''; position: absolute; top: -50%; right: -30%; width: 80%; height: 200%;
  background: radial-gradient(ellipse, rgba(244,121,32,.15) 0%, transparent 70%);
}
.hero-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; position: relative; z-index: 1; }
.hero-content { color: white; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.2);
  border-radius: 100px; padding: 6px 16px; font-size: 13px; color: rgba(255,255,255,.9);
  margin-bottom: 24px; backdrop-filter: blur(8px);
}
.hero-badge .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--orange); animation: pulse 2s infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .4; } }
.hero h1 { font-size: 48px; color: white; margin-bottom: 20px; line-height: 1.2; }
.hero h1 span { color: var(--orange); }
.hero p { font-size: 18px; color: rgba(255,255,255,.8); margin-bottom: 36px; max-width: 520px; }
.hero-buttons { display: flex; gap: 16px; flex-wrap: wrap; }

.hero-visual { position: relative; }
.platform-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px;
}
.platform-card {
  background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.12);
  border-radius: var(--radius-sm); padding: 16px 12px; text-align: center;
  color: white; font-size: 13px; font-weight: 500; backdrop-filter: blur(4px);
  transition: var(--transition);
}
.platform-card:hover { background: rgba(255,255,255,.15); transform: translateY(-3px); }
.platform-card .icon { font-size: 24px; margin-bottom: 6px; }

/* 统计条 */
.stats-bar {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
  margin-top: 48px; padding-top: 32px; border-top: 1px solid rgba(255,255,255,.15);
}
.stat-item { text-align: center; color: white; }
.stat-item .number { font-size: 32px; font-weight: 800; color: var(--orange); }
.stat-item .label { font-size: 13px; color: rgba(255,255,255,.7); margin-top: 4px; }

/* ========== 通用Section ========== */
.section { padding: 100px 0; }
.section-gray { background: var(--gray-50); }
.section-purple { background: linear-gradient(135deg, var(--purple), var(--purple-dark)); color: white; }
.section-blue { background: linear-gradient(135deg, var(--blue), var(--blue-light)); color: white; }

.section-header { text-align: center; max-width: 700px; margin: 0 auto 60px; }
.section-header .tag {
  display: inline-block; background: rgba(91,45,142,.08); color: var(--purple);
  padding: 4px 14px; border-radius: 100px; font-size: 13px; font-weight: 600;
  margin-bottom: 16px;
}
.section-header h2 { font-size: 36px; margin-bottom: 16px; }
.section-header p { font-size: 17px; color: var(--gray-500); }
.section-purple .section-header h2, .section-blue .section-header h2 { color: white; }
.section-purple .section-header p, .section-blue .section-header p { color: rgba(255,255,255,.7); }
.section-purple .section-header .tag, .section-blue .section-header .tag { background: rgba(255,255,255,.15); color: white; }

/* ========== 服务定价 ========== */
.pricing-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.price-card {
  background: white; border-radius: var(--radius); padding: 32px 28px;
  border: 2px solid var(--gray-200); transition: var(--transition);
  position: relative; display: flex; flex-direction: column;
}
.price-card:hover { border-color: var(--purple); box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.price-card.featured {
  border-color: var(--orange); background: linear-gradient(180deg, #FFF7ED 0%, white 30%);
}
.price-card.featured::before {
  content: '推荐'; position: absolute; top: -1px; right: 24px;
  background: var(--orange); color: white; font-size: 12px; font-weight: 700;
  padding: 4px 14px; border-radius: 0 0 8px 8px;
}
.price-card .plan-name { font-size: 15px; color: var(--gray-500); font-weight: 600; margin-bottom: 8px; }
.price-card .plan-title { font-size: 20px; font-weight: 700; margin-bottom: 16px; }
.price-card .plan-price { font-size: 40px; font-weight: 800; color: var(--purple); margin-bottom: 4px; }
.price-card .plan-price span { font-size: 16px; font-weight: 400; color: var(--gray-500); }
.price-card .plan-desc { font-size: 14px; color: var(--gray-500); margin-bottom: 24px; padding-bottom: 24px; border-bottom: 1px solid var(--gray-200); }
.price-card .plan-features { list-style: none; flex: 1; margin-bottom: 28px; }
.price-card .plan-features li { padding: 8px 0; font-size: 14px; color: var(--gray-700); }
.price-card .plan-features li::before { content: '✓ '; color: var(--orange); font-weight: 700; }
.price-card .btn { width: 100%; }

/* ========== 案例 ========== */
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.case-card {
  background: white; border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow-sm); transition: var(--transition); border: 1px solid var(--gray-200);
}
.case-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.case-card-img {
  height: 200px; display: flex; align-items: center; justify-content: center;
  font-size: 48px; font-weight: 800; color: white;
}
.case-card-body { padding: 28px; }
.case-card-body .industry {
  display: inline-block; background: rgba(91,45,142,.08); color: var(--purple);
  padding: 3px 10px; border-radius: 100px; font-size: 12px; font-weight: 600; margin-bottom: 12px;
}
.case-card-body h3 { font-size: 20px; margin-bottom: 12px; }
.case-card-body p { font-size: 14px; color: var(--gray-500); margin-bottom: 16px; line-height: 1.6; }
.case-card-body .result-item { font-size: 14px; color: var(--gray-700); padding: 4px 0; }
.case-card-body .result-item::before { content: '📊 '; }

/* ========== 博客 ========== */
.blog-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.blog-card {
  background: white; border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow-sm); transition: var(--transition); border: 1px solid var(--gray-200);
}
.blog-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.blog-card-cover {
  height: 180px; display: flex; align-items: center; justify-content: center;
  font-size: 36px; position: relative; overflow: hidden;
}
.blog-card-cover .category-tag {
  position: absolute; top: 12px; left: 12px; color: white; font-size: 12px;
  font-weight: 600; padding: 4px 12px; border-radius: 100px;
}
.blog-card-body { padding: 24px; }
.blog-card-body h3 { font-size: 18px; margin-bottom: 10px; line-height: 1.4; }
.blog-card-body h3 a { color: var(--gray-900); }
.blog-card-body h3 a:hover { color: var(--purple); }
.blog-card-body .summary { font-size: 14px; color: var(--gray-500); margin-bottom: 16px; line-height: 1.6; }
.blog-card-body .meta { display: flex; align-items: center; gap: 12px; font-size: 13px; color: var(--gray-500); }

/* ========== CTA ========== */
.cta-section {
  background: linear-gradient(135deg, var(--purple), var(--purple-dark));
  text-align: center; padding: 80px 0; color: white;
}
.cta-section h2 { font-size: 32px; color: white; margin-bottom: 12px; }
.cta-section p { font-size: 17px; color: rgba(255,255,255,.8); margin-bottom: 32px; }
.cta-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ========== FAQ ========== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  border: 1px solid var(--gray-200); border-radius: var(--radius-sm);
  margin-bottom: 12px; overflow: hidden; transition: var(--transition);
}
.faq-item:hover { border-color: var(--purple-light); }
.faq-question {
  padding: 20px 24px; font-size: 16px; font-weight: 600; color: var(--gray-900);
  cursor: pointer; display: flex; justify-content: space-between; align-items: center;
  background: white; border: none; width: 100%; text-align: left;
}
.faq-question::after { content: '+'; font-size: 20px; color: var(--purple); font-weight: 700; transition: var(--transition); }
.faq-item.open .faq-question::after { content: '−'; }
.faq-answer { padding: 0 24px; max-height: 0; overflow: hidden; transition: all .3s ease; }
.faq-item.open .faq-answer { padding: 0 24px 20px; max-height: 500px; }
.faq-answer p { font-size: 15px; color: var(--gray-500); line-height: 1.8; }

/* ========== 页脚 ========== */
.footer { background: var(--gray-900); color: rgba(255,255,255,.7); padding: 60px 0 30px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer h4 { color: white; font-size: 15px; margin-bottom: 16px; }
.footer ul { list-style: none; }
.footer li { margin-bottom: 8px; }
.footer a { color: rgba(255,255,255,.6); font-size: 14px; }
.footer a:hover { color: var(--orange); }
.footer-desc { font-size: 14px; line-height: 1.7; margin-top: 12px; }
.footer-logo { margin-bottom: 0; }
.footer-logo .logo-text { color: white !important; }
.footer-bottom {
  padding-top: 24px; border-top: 1px solid rgba(255,255,255,.1);
  text-align: center; font-size: 13px;
}
.footer-tech { margin-top: 4px; color: rgba(255,255,255,.3); font-size: 12px; }

/* ========== 文章详情 ========== */
.article-page { padding-top: 100px; }
.article-header { text-align: center; padding: 60px 0 40px; background: var(--gray-50); }
.article-header h1 { font-size: 36px; max-width: 800px; margin: 0 auto 16px; }
.article-meta { font-size: 14px; color: var(--gray-500); display: flex; align-items: center; gap: 16px; justify-content: center; }
.article-content { max-width: 800px; margin: 40px auto; padding: 0 24px; }
.article-content h2 { font-size: 24px; margin: 40px 0 16px; padding-top: 16px; border-top: 1px solid var(--gray-200); }
.article-content h3 { font-size: 20px; margin: 28px 0 12px; }
.article-content p { margin-bottom: 16px; }
.article-content ul, .article-content ol { margin-bottom: 16px; padding-left: 24px; }
.article-content li { margin-bottom: 8px; }
.article-content blockquote { border-left: 4px solid var(--orange); padding: 12px 20px; background: var(--gray-50); margin: 20px 0; font-style: italic; color: var(--gray-500); }
.article-content code { background: var(--gray-100); padding: 2px 8px; border-radius: 4px; font-size: 14px; }
.article-content pre { background: var(--gray-900); color: #E5E7EB; padding: 20px; border-radius: var(--radius-sm); overflow-x: auto; margin: 20px 0; }
.article-content pre code { background: none; padding: 0; color: inherit; }

/* 侧边栏 */
.article-layout { display: grid; grid-template-columns: 1fr 300px; gap: 40px; max-width: 1100px; margin: 0 auto; padding: 40px 24px; }
.sidebar .widget { background: white; border: 1px solid var(--gray-200); border-radius: var(--radius-sm); padding: 20px; margin-bottom: 20px; }
.sidebar .widget h4 { font-size: 15px; margin-bottom: 12px; padding-bottom: 8px; border-bottom: 1px solid var(--gray-200); }
.sidebar .widget a { display: block; padding: 8px 0; font-size: 14px; color: var(--gray-700); }
.sidebar .widget a:hover { color: var(--purple); }

/* ========== 关于页 ========== */
.about-hero { text-align: center; padding: 120px 0 60px; background: linear-gradient(135deg, var(--blue), var(--purple)); color: white; }
.about-hero h1 { font-size: 40px; color: white; margin-bottom: 16px; }
.about-hero p { font-size: 18px; color: rgba(255,255,255,.8); max-width: 600px; margin: 0 auto; }
.founder-card {
  display: grid; grid-template-columns: 300px 1fr; gap: 40px;
  background: white; border-radius: var(--radius); padding: 40px;
  box-shadow: var(--shadow-md); max-width: 900px; margin: -60px auto 0; position: relative;
}
.founder-avatar {
  width: 300px; height: 300px; border-radius: var(--radius);
  background: linear-gradient(135deg, var(--purple), var(--orange));
  display: flex; align-items: center; justify-content: center;
  font-size: 80px; color: white;
}
.founder-info h2 { font-size: 28px; margin-bottom: 8px; }
.founder-info .title { color: var(--orange); font-weight: 600; margin-bottom: 16px; }
.founder-info p { font-size: 15px; line-height: 1.8; color: var(--gray-500); margin-bottom: 12px; }
.tags { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 16px; }
.tags span {
  display: inline-block; padding: 4px 12px; border-radius: 100px;
  font-size: 13px; font-weight: 500; border: 1px solid var(--gray-200); color: var(--gray-700);
}

/* ========== 联系表单 ========== */
.contact-form { max-width: 600px; margin: 0 auto; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; color: var(--gray-700); margin-bottom: 6px; }
.form-group input, .form-group textarea, .form-group select {
  width: 100%; padding: 12px 16px; border: 2px solid var(--gray-200); border-radius: var(--radius-sm);
  font-size: 15px; transition: var(--transition); font-family: inherit;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  outline: none; border-color: var(--purple); box-shadow: 0 0 0 3px rgba(91,45,142,.1);
}
.form-group textarea { min-height: 120px; resize: vertical; }

/* ========== 分页 ========== */
.pagination { display: flex; justify-content: center; gap: 8px; margin-top: 40px; }
.pagination a, .pagination span {
  display: flex; align-items: center; justify-content: center;
  width: 40px; height: 40px; border-radius: var(--radius-sm);
  font-size: 14px; font-weight: 600; border: 1px solid var(--gray-200);
  color: var(--gray-700);
}
.pagination a:hover { border-color: var(--purple); color: var(--purple); }
.pagination .current { background: var(--purple); color: white; border-color: var(--purple); }

/* ========== 分类筛选 ========== */
.filter-bar { display: flex; gap: 10px; justify-content: center; margin-bottom: 40px; flex-wrap: wrap; }
.filter-btn {
  padding: 8px 20px; border-radius: 100px; font-size: 14px; font-weight: 500;
  border: 1px solid var(--gray-200); background: white; color: var(--gray-700); cursor: pointer;
  transition: var(--transition);
}
.filter-btn:hover, .filter-btn.active { background: var(--purple); color: white; border-color: var(--purple); }

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
  .pricing-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-grid { grid-template-columns: 1fr; text-align: center; }
  .hero p { margin: 0 auto 36px; }
  .hero-buttons { justify-content: center; }
  .hero-visual { max-width: 500px; margin: 0 auto; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .article-layout { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .hero h1 { font-size: 32px; }
  .section { padding: 60px 0; }
  .section-header h2 { font-size: 28px; }
  .pricing-grid { grid-template-columns: 1fr; max-width: 400px; margin: 0 auto; }
  .case-grid, .blog-grid { grid-template-columns: 1fr; max-width: 500px; margin: 0 auto; }
  .founder-card { grid-template-columns: 1fr; text-align: center; }
  .founder-avatar { width: 200px; height: 200px; margin: 0 auto; font-size: 60px; }
  .footer-grid { grid-template-columns: 1fr; }
  .stats-bar { grid-template-columns: repeat(3, 1fr); gap: 12px; }
  .stat-item .number { font-size: 24px; }

  /* 移动端导航 */
  .nav-toggle { display: block; }
  .nav-links {
    display: none; position: absolute; top: 72px; left: 0; right: 0;
    background: white; flex-direction: column; padding: 16px;
    border-bottom: 1px solid var(--gray-200); box-shadow: var(--shadow-md);
  }
  .nav-links.active { display: flex; }
  .nav-links a { padding: 12px 16px; }
}