/* ===========================
   Cloud Rating Platform
   Design System & Global Styles
   =========================== */

/* 设计令牌 */
:root {
    --primary-color: #4f46e5;
    --primary-dark: #4338ca;
    --primary-light: #e0e7ff;
    --secondary-color: #0ea5e9;
    --secondary-light: #e0f2fe;
    --success-color: #10b981;
    --success-light: #ecfdf5;
    --danger-color: #ef4444;
    --danger-light: #fef2f2;
    --warning-color: #f59e0b;
    --warning-light: #fffbeb;

    --text-color: #0f172a;
    --text-secondary: #475569;
    --text-light: #94a3b8;
    --text-inverse: #ffffff;

    --bg-color: #f8fafc;
    --bg-white: #ffffff;
    --bg-dark: #0f172a;
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;

    --shadow-xs: 0 1px 2px rgba(0,0,0,0.04);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -1px rgba(0,0,0,0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -2px rgba(0,0,0,0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.08), 0 10px 10px -5px rgba(0,0,0,0.03);
    --shadow-glow: 0 0 20px rgba(79,70,229,0.15);

    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.25rem;
    --radius-full: 9999px;

    --transition-fast: 0.15s ease;
    --transition-base: 0.25s ease;
    --transition-slow: 0.4s ease;
}

/* 重置与基础 */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--bg-color);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a { text-decoration: none; color: inherit; transition: color var(--transition-fast); }

img { max-width: 100%; display: block; }

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ===========================
   按钮
   =========================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius-sm);
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all var(--transition-base);
    white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary {
    background: var(--primary-color);
    color: var(--text-inverse);
}
.btn-primary:hover { background: var(--primary-dark); box-shadow: var(--shadow-glow); }

.btn-outline {
    background: transparent;
    border-color: var(--primary-color);
    color: var(--primary-color);
}
.btn-outline:hover { background: var(--primary-color); color: var(--text-inverse); }

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}
.btn-ghost:hover { background: var(--border-light); color: var(--text-color); }

.btn-large { padding: 0.875rem 2rem; font-size: 1rem; border-radius: var(--radius-md); }
.btn-full { width: 100%; }

.btn-search {
    position: absolute;
    right: 5px; top: 5px; bottom: 5px;
    padding: 0 1.5rem;
    border-radius: var(--radius-sm);
}

/* ===========================
   导航栏
   =========================== */
.navbar {
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
}

.nav-brand a {
    font-size: 1.375rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.nav-menu {
    display: flex;
    list-style: none;
    align-items: center;
    gap: 0.25rem;
}

.nav-menu > li > a {
    padding: 0.5rem 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9375rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}
.nav-menu > li > a:hover,
.nav-menu > li > a.active {
    color: var(--primary-color);
    background: var(--primary-light);
}

.mobile-menu-btn {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.25rem;
    color: var(--text-secondary);
}

/* 用户下拉菜单 */
.user-dropdown { position: relative; }

.user-name {
    display: flex; align-items: center; gap: 0.5rem;
    cursor: pointer; font-weight: 600;
}
.user-name::after {
    content: '';
    border: solid var(--text-secondary);
    border-width: 0 2px 2px 0;
    padding: 2px;
    transform: rotate(45deg);
    margin-top: -2px;
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    min-width: 180px;
    padding: 0.5rem;
    z-index: 100;
}
.user-dropdown:hover .dropdown-menu { display: block; }

.dropdown-menu a {
    display: flex;
    padding: 0.625rem 1rem;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    font-size: 0.9375rem;
}
.dropdown-menu a:hover {
    background: var(--primary-light);
    color: var(--primary-color);
}

/* ===========================
   首页 Hero
   =========================== */
.hero {
    position: relative;
    background: linear-gradient(135deg, #312e81 0%, #4f46e5 40%, #0ea5e9 100%);
    color: var(--text-inverse);
    padding: 5rem 0 4rem;
    text-align: center;
    overflow: hidden;
}
.hero::before {
    content: '';
    position: absolute;
    top: -50%; left: -50%;
    width: 200%; height: 200%;
    background: radial-gradient(circle at 30% 50%, rgba(255,255,255,0.05) 0%, transparent 50%),
                radial-gradient(circle at 70% 80%, rgba(255,255,255,0.03) 0%, transparent 40%);
    pointer-events: none;
}

.hero h1 {
    font-size: 3.25rem;
    margin-bottom: 1rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.2;
    position: relative;
}
.hero .subtitle {
    font-size: 1.25rem;
    margin-bottom: 2.5rem;
    opacity: 0.9;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    position: relative;
}
.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 2.5rem;
    position: relative;
}
.hero .btn-outline {
    border-color: rgba(255,255,255,0.6);
    color: rgba(255,255,255,0.95);
}
.hero .btn-outline:hover {
    background: rgba(255,255,255,0.15);
    border-color: rgba(255,255,255,0.9);
    color: #fff;
}
.hero .btn-primary {
    background: #fff;
    color: var(--primary-color);
}
.hero .btn-primary:hover {
    background: #f0f0ff;
    box-shadow: 0 8px 30px rgba(0,0,0,0.15);
}
.disclaimer-banner {
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.15);
    padding: 1rem 1.75rem;
    border-radius: var(--radius-md);
    max-width: 800px;
    margin: 0 auto;
    font-size: 0.875rem;
    line-height: 1.7;
    position: relative;
}

/* ===========================
   统计数据
   =========================== */
.stats-section {
    background: var(--bg-white);
    padding: 0;
    margin-top: -2rem;
    position: relative;
    z-index: 1;
}
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    max-width: 700px;
    margin: 0 auto;
}
.stat-card {
    text-align: center;
    padding: 2.5rem 1.5rem;
}
.stat-number {
    font-size: 2.75rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}
.stat-label {
    color: var(--text-light);
    font-size: 0.9375rem;
    font-weight: 500;
    margin-top: 0.25rem;
}

/* ===========================
   分区标题
   =========================== */
.section-title {
    text-align: center;
    font-size: 1.875rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-color);
    letter-spacing: -0.02em;
}
.section-subtitle {
    text-align: center;
    color: var(--text-light);
    margin-bottom: 2.5rem;
    font-size: 1.0625rem;
}

/* ===========================
   搜索与筛选
   =========================== */
.search-filters {
    background: var(--bg-white);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    margin-bottom: 2rem;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}
.search-box { flex: 1; position: relative; min-width: 250px; }
.search-box input {
    width: 100%;
    padding: 0.75rem 5rem 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}
.search-box input:focus { outline: none; border-color: var(--primary-color); box-shadow: 0 0 0 3px var(--primary-light); }

.category-filter { display: flex; align-items: center; gap: 0.5rem; }
.category-filter select {
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.9375rem;
    background-color: var(--bg-white);
    cursor: pointer;
    transition: border-color var(--transition-fast);
}
.category-filter select:focus { border-color: var(--primary-color); outline: none; }

/* ===========================
   厂商卡片
   =========================== */
.providers-section { padding: 4rem 0; }
.providers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}
.provider-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    border: 1px solid var(--border-color);
    transition: all var(--transition-base);
    cursor: pointer;
    position: relative;
}
.provider-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    transform: translateY(-3px);
}

.provider-header { display: flex; align-items: center; margin-bottom: 1.25rem; }
.provider-logo {
    width: 52px; height: 52px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex; align-items: center; justify-content: center;
    color: var(--text-inverse);
    font-weight: 700;
    font-size: 1.25rem;
    margin-right: 1rem;
    flex-shrink: 0;
}
.provider-info h3 { font-size: 1.125rem; font-weight: 700; margin-bottom: 0.125rem; }
.provider-category {
    display: inline-block;
    background: var(--primary-light);
    color: var(--primary-color);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.125rem 0.625rem;
    border-radius: var(--radius-full);
}

.provider-rating { display: flex; align-items: center; gap: 0.5rem; margin-bottom: 1rem; }
.stars { color: var(--warning-color); font-size: 1.125rem; letter-spacing: 1px; }
.rating-number { font-weight: 700; color: var(--text-color); }
.review-count { color: var(--text-light); font-size: 0.8125rem; }

.provider-description {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-bottom: 1.25rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.7;
}
.provider-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1.25rem;
    border-top: 1px solid var(--border-light);
}
.provider-website { color: var(--primary-color); font-size: 0.875rem; font-weight: 500; }
.view-details { color: var(--text-light); font-size: 0.875rem; font-weight: 500; transition: color var(--transition-fast); }
.provider-card:hover .view-details { color: var(--primary-color); }

/* ===========================
   分页
   =========================== */
.pagination { display: flex; justify-content: center; gap: 0.5rem; flex-wrap: wrap; }
.pagination button {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    background: var(--bg-white);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 500;
    transition: all var(--transition-fast);
}
.pagination button:hover { border-color: var(--primary-color); color: var(--primary-color); }
.pagination button.active { background: var(--primary-color); color: var(--text-inverse); border-color: var(--primary-color); }
.pagination button:disabled { opacity: 0.4; cursor: not-allowed; }

/* ===========================
   教育模块
   =========================== */
.education-section { background: var(--bg-white); padding: 5rem 0; }
.education-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
.education-card {
    text-align: center;
    padding: 2rem 1.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}
.education-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}
.education-icon { font-size: 2.5rem; margin-bottom: 1rem; }
.education-card h3 { margin-bottom: 0.75rem; font-size: 1.0625rem; }
.education-card p { color: var(--text-secondary); line-height: 1.7; font-size: 0.9375rem; }

/* ===========================
   法律声明
   =========================== */
.legal-section { padding: 4rem 0; background: var(--bg-color); }
.legal-content { background: var(--bg-white); padding: 2.5rem; border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); }
.legal-warning {
    border-left: 4px solid var(--warning-color);
    background: var(--warning-light);
    padding: 1.25rem 1.5rem;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin-bottom: 2rem;
}
.legal-warning strong { display: block; color: var(--warning-color); margin-bottom: 0.5rem; font-weight: 700; }
.legal-warning p { color: var(--text-secondary); line-height: 1.8; }
.legal-links { display: flex; gap: 1.5rem; flex-wrap: wrap; }
.legal-link { color: var(--primary-color); font-weight: 600; }
.legal-link:hover { text-decoration: underline; }

/* ===========================
   Footer
   =========================== */
.footer {
    background: var(--bg-dark);
    color: var(--text-inverse);
    padding: 4rem 0 1.5rem;
}
.footer-content {
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: 3rem;
    margin-bottom: 3rem;
}
.footer-section h3 { font-size: 1.375rem; font-weight: 800; margin-bottom: 0.75rem; }
.footer-section > p { color: var(--text-light); font-size: 0.9375rem; }
.footer-section h4 { font-size: 0.9375rem; font-weight: 600; margin-bottom: 1.25rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--text-light); }
.footer-section ul { list-style: none; }
.footer-section ul li { margin-bottom: 0.625rem; }
.footer-section a { color: #94a3b8; font-size: 0.9375rem; transition: color var(--transition-fast); }
.footer-section a:hover { color: var(--text-inverse); }
.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #1e293b;
    color: #64748b;
    font-size: 0.875rem;
}

/* ===========================
   模态框
   =========================== */
.modal {
    display: none;
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(15,23,42,0.6);
    backdrop-filter: blur(4px);
    z-index: 2000;
    justify-content: center;
    align-items: center;
}
.modal.active { display: flex; }
.modal-content {
    background: var(--bg-white);
    padding: 2.5rem;
    border-radius: var(--radius-xl);
    max-width: 440px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    box-shadow: var(--shadow-xl);
}
.modal-large { max-width: 640px; }
.modal-close {
    position: absolute;
    top: 1rem; right: 1rem;
    width: 36px; height: 36px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.25rem;
    cursor: pointer;
    color: var(--text-light);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}
.modal-close:hover { background: var(--border-light); color: var(--text-color); }
.modal h2 { margin-bottom: 2rem; text-align: center; font-weight: 700; font-size: 1.5rem; }

/* 表单 */
.form-group { margin-bottom: 1.25rem; }
.form-group label { display: block; margin-bottom: 0.5rem; font-weight: 600; font-size: 0.9375rem; color: var(--text-color); }
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.9375rem;
    font-family: inherit;
    transition: all var(--transition-fast);
    background: var(--bg-white);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-light);
}
.form-note { font-size: 0.8125rem; color: var(--text-light); margin-bottom: 1.25rem; }
.modal-footer-text { text-align: center; margin-top: 1.25rem; color: var(--text-light); font-size: 0.9375rem; }
.modal-footer-text a { color: var(--primary-color); font-weight: 600; }

/* ===========================
   加载状态
   =========================== */
.loading {
    text-align: center;
    padding: 3rem 2rem;
    color: var(--text-light);
    font-size: 0.9375rem;
}

/* ===========================
   响应式
   =========================== */
@media (max-width: 1024px) {
    .education-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-content { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    .hero h1 { font-size: 2.25rem; }
    .hero .subtitle { font-size: 1.0625rem; }
    .hero-actions { flex-direction: column; align-items: center; }
    .hero { padding: 3.5rem 0 3rem; }
    .stats-grid { grid-template-columns: repeat(3, 1fr); }
    .providers-grid { grid-template-columns: 1fr; }
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%; left: 0; right: 0;
        background: var(--bg-white);
        flex-direction: column;
        padding: 1rem;
        box-shadow: var(--shadow-lg);
        border-top: 1px solid var(--border-color);
    }
    .nav-menu.active { display: flex; }
    .mobile-menu-btn { display: block; }
    .search-filters { flex-direction: column; }
    .education-grid { grid-template-columns: 1fr 1fr; }
    .legal-links { flex-direction: column; }
    .footer-content { grid-template-columns: 1fr; gap: 2rem; }
    .section-title { font-size: 1.5rem; }
}
@media (max-width: 480px) {
    .container { padding: 0 1rem; }
    .hero { padding: 2.5rem 0 2rem; }
    .hero h1 { font-size: 1.75rem; }
    .disclaimer-banner { font-size: 0.8125rem; padding: 0.75rem 1rem; }
    .stat-number { font-size: 2rem; }
    .education-grid { grid-template-columns: 1fr; }
}