/* ===================================================
   顺学网 - 全新现代化设计风格 v2.0
   =================================================== */

/* === 变量 & 重置 === */
:root {
    --primary: #ff7043;
    --primary-dark: #e64a19;
    --primary-light: #ffab91;
    --accent: #ff5722;
    --bg-main: #fafbfc;
    --bg-card: #ffffff;
    --bg-dark: #1a1a2e;
    --text-primary: #1a1a2e;
    --text-secondary: #666666;
    --text-muted: #999999;
    --border: #eee;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
    --shadow-md: 0 8px 24px rgba(0,0,0,0.1);
    --shadow-lg: 0 16px 48px rgba(0,0,0,0.12);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body { font-family: 'Inter', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif; color: var(--text-primary); background: var(--bg-main); line-height: 1.6; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; }
ul { list-style: none; }
em { color: var(--accent); font-style: normal; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* === Header === */
.site-header { position: sticky; top: 0; z-index: 1000; background: rgba(255,255,255,0.95); backdrop-filter: blur(20px); border-bottom: 1px solid rgba(0,0,0,0.05); }
.header-main { padding: 0; }
.header-container { display: flex; align-items: center; height: 72px; gap: 32px; }

.header-logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.logo-icon-new { width: 40px; height: 40px; background: linear-gradient(135deg, var(--primary), var(--accent)); border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center; color: #fff; box-shadow: 0 4px 16px rgba(255,112,67,0.4); transition: var(--transition); }
.logo-icon-new svg { width: 24px; height: 24px; }
.header-logo:hover .logo-icon-new { transform: rotate(-8deg) scale(1.1); }
.logo-text-new { font-size: 22px; font-weight: 800; background: linear-gradient(135deg, var(--primary), var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }

.header-nav { display: flex; align-items: center; gap: 8px; flex: 1; }
.nav-link { display: flex; align-items: center; gap: 6px; padding: 10px 18px; border-radius: var(--radius-lg); font-size: 15px; font-weight: 500; color: var(--text-secondary); transition: var(--transition); }
.nav-icon { font-size: 16px; }
.nav-link:hover, .nav-link.active { background: linear-gradient(135deg, rgba(255,112,67,0.1), rgba(255,87,34,0.05)); color: var(--primary); }
.nav-link.active { font-weight: 600; }

.header-actions { display: flex; align-items: center; gap: 12px; }
.city-selector { position: relative; }
.city-btn { display: flex; align-items: center; gap: 6px; padding: 8px 14px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); cursor: pointer; font-size: 14px; transition: var(--transition); }
.city-btn:hover { border-color: var(--primary); }
.city-arrow { font-size: 10px; color: var(--text-muted); }
.city-dropdown-new { position: absolute; top: 100%; left: 50%; transform: translateX(-50%) translateY(8px); background: var(--bg-card); border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); padding: 20px; min-width: 320px; opacity: 0; visibility: hidden; transition: var(--transition); z-index: 100; }
.city-dropdown-new.show { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }
.city-dropdown-inner { max-height: 400px; overflow-y: auto; }
.city-hot, .city-all { margin-bottom: 16px; }
.city-label { font-size: 12px; color: var(--text-muted); font-weight: 600; margin-bottom: 10px; display: block; }
.city-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.city-tag { padding: 6px 14px; background: var(--bg-main); border-radius: var(--radius-lg); font-size: 13px; color: var(--text-secondary); transition: var(--transition); }
.city-tag:hover, .city-tag.active { background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff; }
.header-btn-outline { padding: 10px 20px; border: 2px solid var(--primary); color: var(--primary); border-radius: var(--radius-lg); font-size: 14px; font-weight: 600; transition: var(--transition); }
.header-btn-outline:hover { background: var(--primary); color: #fff; }

.mobile-menu-btn { display: none; flex-direction: column; gap: 5px; padding: 8px; background: none; border: none; cursor: pointer; }
.mobile-menu-btn span { display: block; width: 24px; height: 2px; background: var(--text-primary); border-radius: 2px; transition: var(--transition); }

/* === Hero Section === */
.hero-section { position: relative; padding: 80px 0 60px; background: linear-gradient(135deg, #fff5f0 0%, #fff9f7 50%, #fff 100%); overflow: hidden; }
.hero-bg { position: absolute; top: 0; left: 0; right: 0; bottom: 0; pointer-events: none; }
.hero-shape { position: absolute; border-radius: 50%; opacity: 0.5; }
.shape-1 { width: 400px; height: 400px; background: radial-gradient(circle, rgba(255,112,67,0.15), transparent 70%); top: -100px; right: -100px; }
.shape-2 { width: 300px; height: 300px; background: radial-gradient(circle, rgba(255,87,34,0.1), transparent 70%); bottom: -50px; left: 10%; }
.shape-3 { width: 200px; height: 200px; background: radial-gradient(circle, rgba(255,152,0,0.1), transparent 70%); top: 50%; left: 5%; }

.hero-content { max-width: 720px; margin: 0 auto; text-align: center; position: relative; z-index: 1; }
.hero-badge { display: inline-flex; align-items: center; gap: 8px; padding: 8px 20px; background: linear-gradient(135deg, rgba(255,112,67,0.1), rgba(255,87,34,0.05)); border: 1px solid rgba(255,112,67,0.2); border-radius: var(--radius-xl); font-size: 14px; font-weight: 600; color: var(--primary); margin-bottom: 24px; animation: fadeInUp 0.6s ease-out; }
.badge-icon { font-size: 18px; }
.hero-title { font-size: 52px; font-weight: 800; line-height: 1.2; margin-bottom: 20px; animation: fadeInUp 0.6s ease-out 0.1s both; }
.hero-highlight { background: linear-gradient(135deg, var(--primary), var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.hero-desc { font-size: 18px; color: var(--text-secondary); margin-bottom: 40px; animation: fadeInUp 0.6s ease-out 0.2s both; }

/* Hero 搜索 */
.hero-search { background: var(--bg-card); border-radius: var(--radius-xl); padding: 8px; box-shadow: var(--shadow-lg); animation: fadeInUp 0.6s ease-out 0.3s both; }
.search-tabs-new { display: flex; justify-content: center; gap: 8px; margin-bottom: 8px; }
.search-tab-new { padding: 8px 24px; font-size: 15px; font-weight: 500; color: var(--text-secondary); cursor: pointer; border-radius: var(--radius-lg); transition: var(--transition); }
.search-tab-new.active { background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff; box-shadow: 0 4px 12px rgba(255,112,67,0.3); }
.search-form-new { display: flex; gap: 8px; }
.search-inputs { display: flex; flex: 1; gap: 8px; }
.search-input-group { display: flex; align-items: center; gap: 8px; padding: 0 16px; background: var(--bg-main); border-radius: var(--radius-lg); }
.search-input-group.flex-1 { flex: 1; }
.input-icon { font-size: 18px; }
.search-select, .search-text { border: none; background: transparent; padding: 14px 0; font-size: 15px; outline: none; min-width: 100px; }
.search-text { width: 100%; }
.search-btn-new { display: flex; align-items: center; gap: 8px; padding: 14px 28px; background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff; border: none; border-radius: var(--radius-lg); font-size: 15px; font-weight: 600; cursor: pointer; transition: var(--transition); box-shadow: 0 4px 16px rgba(255,112,67,0.3); }
.search-btn-new:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(255,112,67,0.4); }

@keyframes fadeInUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }

/* === Section Header === */
.section-header { text-align: center; margin-bottom: 40px; }
.section-tag { display: inline-block; padding: 6px 16px; background: linear-gradient(135deg, rgba(255,112,67,0.1), rgba(255,87,34,0.05)); border: 1px solid rgba(255,112,67,0.2); border-radius: var(--radius-xl); font-size: 13px; font-weight: 600; color: var(--primary); margin-bottom: 12px; }
.section-title-new { font-size: 32px; font-weight: 700; margin-bottom: 8px; }
.section-subtitle { font-size: 16px; color: var(--text-secondary); }
.section-more { font-size: 14px; color: var(--primary); font-weight: 600; }

/* === Categories === */
.categories-section { padding: 60px 0; background: var(--bg-card); }
.categories-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px; }
.category-card { display: flex; flex-direction: column; align-items: center; padding: 28px 16px; background: var(--bg-main); border-radius: var(--radius-lg); border: 2px solid transparent; text-align: center; transition: var(--transition); position: relative; overflow: hidden; }
.category-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px; background: linear-gradient(90deg, var(--primary), var(--accent)); transform: scaleX(0); transition: transform 0.3s; }
.category-card:hover { border-color: var(--primary-light); transform: translateY(-8px); box-shadow: var(--shadow-lg); }
.category-card:hover::before { transform: scaleX(1); }
.category-icon-wrap { width: 64px; height: 64px; background: linear-gradient(135deg, rgba(255,112,67,0.1), rgba(255,87,34,0.05)); border-radius: var(--radius-lg); display: flex; align-items: center; justify-content: center; margin-bottom: 16px; transition: var(--transition); }
.category-icon { font-size: 32px; }
.category-card:hover .category-icon-wrap { transform: scale(1.1) rotate(-5deg); background: linear-gradient(135deg, var(--primary), var(--accent)); }
.category-card:hover .category-icon { transform: scale(1.2); }
.category-name { font-size: 16px; font-weight: 600; margin-bottom: 4px; }
.category-count { font-size: 13px; color: var(--text-muted); }
.category-arrow { position: absolute; bottom: 16px; right: 16px; font-size: 18px; color: var(--primary); opacity: 0; transform: translateX(-10px); transition: var(--transition); }
.category-card:hover .category-arrow { opacity: 1; transform: translateX(0); }

/* === Orgs Grid === */
.orgs-section { padding: 60px 0; background: var(--bg-main); }
.section-header { display: flex; flex-direction: column; align-items: center; }
.orgs-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.org-card-new { background: var(--bg-card); border-radius: var(--radius-lg); padding: 24px; position: relative; transition: var(--transition); border: 2px solid transparent; }
.org-card-new:hover { border-color: var(--primary-light); transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.org-card-badge { position: absolute; top: 16px; right: 16px; padding: 4px 12px; background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff; font-size: 12px; font-weight: 600; border-radius: var(--radius-lg); }
.org-card-top { display: flex; gap: 16px; margin-bottom: 16px; }
.org-card-logo { width: 56px; height: 56px; border-radius: var(--radius-md); overflow: hidden; flex-shrink: 0; box-shadow: var(--shadow-sm); }
.org-card-logo img { width: 100%; height: 100%; object-fit: cover; }
.org-logo-placeholder { width: 100%; height: 100%; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff; font-size: 24px; font-weight: 700; }
.org-card-info { flex: 1; min-width: 0; }
.org-card-name { font-size: 17px; font-weight: 700; margin-bottom: 6px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.org-card-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.org-tag { padding: 3px 10px; background: var(--bg-main); border-radius: var(--radius-lg); font-size: 12px; color: var(--text-secondary); }
.org-tag.location { color: var(--primary); }
.org-card-desc { font-size: 14px; color: var(--text-secondary); line-height: 1.5; margin-bottom: 16px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.org-card-footer { display: flex; justify-content: space-around; padding-top: 16px; border-top: 1px solid var(--border); }
.org-stat { text-align: center; }
.stat-num { display: block; font-size: 18px; font-weight: 700; color: var(--primary); }
.stat-label { font-size: 12px; color: var(--text-muted); }

/* === Courses Grid === */
.courses-section { padding: 60px 0; background: var(--bg-card); }
.courses-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.course-card-new { background: var(--bg-card); border-radius: var(--radius-lg); overflow: hidden; border: 1px solid var(--border); transition: var(--transition); }
.course-card-new:hover { border-color: var(--primary-light); transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.course-card-thumb { position: relative; height: 180px; overflow: hidden; background: linear-gradient(135deg, #f5f5f5, #eee); }
.course-card-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s; }
.course-card-new:hover .course-card-thumb img { transform: scale(1.1); }
.course-thumb-placeholder { width: 100%; height: 100%; display: flex; align-items: center; justify-content: center; font-size: 48px; }
.course-hot-badge { position: absolute; top: 12px; left: 12px; padding: 4px 12px; background: linear-gradient(135deg, #ff5722, #e64a19); color: #fff; font-size: 12px; font-weight: 600; border-radius: var(--radius-lg); }
.course-card-body { padding: 20px; }
.course-card-title { font-size: 16px; font-weight: 600; margin-bottom: 10px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; line-height: 1.4; }
.course-card-org { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text-secondary); margin-bottom: 8px; }
.org-avatar-sm { width: 24px; height: 24px; background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 12px; font-weight: 600; }
.course-card-meta { font-size: 13px; color: var(--text-muted); }
.course-card-footer { display: flex; justify-content: space-between; align-items: center; padding: 16px 20px; background: var(--bg-main); border-top: 1px solid var(--border); }
.price-num { font-size: 22px; font-weight: 800; color: var(--accent); }
.price-free { font-size: 16px; font-weight: 700; color: #4caf50; }
.course-enroll { font-size: 13px; color: var(--text-muted); }

/* === Cities Section === */
.cities-section-new { padding: 60px 0; background: var(--bg-main); }
.cities-showcase { background: var(--bg-card); border-radius: var(--radius-xl); padding: 32px; box-shadow: var(--shadow-sm); }
.cities-main-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 20px; }
.city-card-new { display: flex; align-items: center; justify-content: center; padding: 20px; background: var(--bg-main); border-radius: var(--radius-lg); border: 2px solid transparent; transition: var(--transition); }
.city-card-new:hover, .city-card-new.active { border-color: var(--primary); background: linear-gradient(135deg, rgba(255,112,67,0.05), rgba(255,87,34,0.02)); }
.city-name-new { font-size: 16px; font-weight: 600; color: var(--text-primary); }
.cities-more { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }
.city-tag-new { padding: 8px 16px; background: var(--bg-main); border-radius: var(--radius-lg); font-size: 14px; color: var(--text-secondary); transition: var(--transition); }
.city-tag-new:hover, .city-tag-new.active { background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff; }

/* === CTA Section === */
.cta-section { padding: 40px 0 60px; }
.cta-card { background: linear-gradient(135deg, var(--primary), var(--accent)); border-radius: var(--radius-xl); padding: 48px; display: flex; align-items: center; justify-content: space-between; color: #fff; }
.cta-content h2 { font-size: 28px; font-weight: 700; margin-bottom: 8px; }
.cta-content p { font-size: 16px; opacity: 0.9; }
.cta-actions { display: flex; gap: 16px; }
.cta-btn-primary { padding: 14px 32px; background: #fff; color: var(--primary); border-radius: var(--radius-lg); font-size: 16px; font-weight: 700; transition: var(--transition); }
.cta-btn-primary:hover { transform: translateY(-3px); box-shadow: 0 8px 24px rgba(0,0,0,0.2); }
.cta-btn-secondary { padding: 14px 32px; background: rgba(255,255,255,0.2); color: #fff; border-radius: var(--radius-lg); font-size: 16px; font-weight: 600; border: 2px solid rgba(255,255,255,0.5); transition: var(--transition); }
.cta-btn-secondary:hover { background: rgba(255,255,255,0.3); }

/* === Footer === */
.site-footer { background: var(--bg-dark); color: rgba(255,255,255,0.8); }
.footer-main { padding: 60px 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr 1.5fr; gap: 40px; }
.footer-logo { display: flex; align-items: center; gap: 10px; font-size: 22px; font-weight: 800; color: #fff; margin-bottom: 16px; }
.footer-logo-icon { font-size: 28px; }
.footer-desc { font-size: 14px; line-height: 1.7; color: rgba(255,255,255,0.6); margin-bottom: 20px; }
.footer-social { display: flex; gap: 12px; }
.social-link { width: 40px; height: 40px; background: rgba(255,255,255,0.1); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 18px; transition: var(--transition); }
.social-link:hover { background: var(--primary); transform: translateY(-3px); }
.footer-col-title { font-size: 16px; font-weight: 600; color: #fff; margin-bottom: 20px; }
.footer-links li { margin-bottom: 12px; }
.footer-links a { font-size: 14px; color: rgba(255,255,255,0.6); transition: var(--transition); }
.footer-links a:hover { color: var(--primary); padding-left: 6px; }
.contact-item { display: flex; align-items: center; gap: 10px; font-size: 14px; margin-bottom: 14px; color: rgba(255,255,255,0.7); }
.contact-icon { font-size: 16px; }
.footer-bottom { background: rgba(0,0,0,0.2); padding: 20px 0; }
.footer-bottom-content { display: flex; justify-content: space-between; font-size: 13px; color: rgba(255,255,255,0.5); }
.footer-bottom-content a { color: rgba(255,255,255,0.5); }
.footer-bottom-content a:hover { color: var(--primary); }

/* === 响应式 === */
@media (max-width: 1024px) {
    .categories-grid { grid-template-columns: repeat(4, 1fr); }
    .orgs-grid { grid-template-columns: repeat(3, 1fr); }
    .courses-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 768px) {
    .header-nav { display: none; }
    .header-btn-outline { display: none; }
    .mobile-menu-btn { display: flex; }
    .hero-title { font-size: 36px; }
    .hero-search { padding: 6px; }
    .search-tabs-new { gap: 4px; }
    .search-tab-new { padding: 6px 16px; font-size: 14px; }
    .search-inputs { flex-direction: column; }
    .search-form-new { flex-direction: column; }
    .categories-grid { grid-template-columns: repeat(3, 1fr); }
    .orgs-grid { grid-template-columns: repeat(2, 1fr); }
    .courses-grid { grid-template-columns: 1fr; }
    .cities-main-grid { grid-template-columns: repeat(2, 1fr); }
    .cta-card { flex-direction: column; text-align: center; gap: 24px; }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
    .categories-grid { grid-template-columns: repeat(2, 1fr); }
    .orgs-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
}

/* === 动画 === */
.fade-in { animation: fadeIn 0.5s ease-out; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.bounce-in { animation: bounceIn 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55); }
@keyframes bounceIn { 0% { transform: scale(0); } 50% { transform: scale(1.1); } 100% { transform: scale(1); } }