/* ===== 全局重置 & 基础 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #2B5FD7;
    --primary-dark: #1E4AAD;
    --secondary: #7C3AED;
    --accent: #F59E0B;
    --success: #22C55E;
    --danger: #EF4444;
    --bg: #F8FAFC;
    --white: #FFFFFF;
    --text-dark: #0F172A;
    --text-mid: #475569;
    --text-light: #94A3B8;
    --border: #E2E8F0;
    --radius: 12px;
    --radius-btn: 24px;
    --shadow: 0 4px 24px rgba(43, 95, 215, 0.10);
    --shadow-lg: 0 12px 48px rgba(43, 95, 215, 0.15);
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: linear-gradient(165deg, #EEF2FF 0%, #F8FAFC 60%, #FFFFFF 100%);
    color: var(--text-dark);
    line-height: 1.7;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

/* ===== 顶部 Logo ===== */
.legal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 40px;
    max-width: 900px;
    margin: 0 auto;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.nav-logo .logo-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 18px;
    font-weight: 700;
}

.nav-logo .brand-name {
    font-weight: 800;
    font-size: 22px;
    color: var(--text-dark);
    letter-spacing: -0.5px;
}

.nav-logo .brand-name .highlight {
    color: var(--primary);
}

.back-link {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-mid);
    text-decoration: none;
    padding: 8px 16px;
    border-radius: var(--radius-btn);
    background: var(--white);
    border: 1px solid var(--border);
    transition: var(--transition);
}

.back-link:hover {
    color: var(--primary);
    border-color: var(--primary);
}

/* ===== 主体 ===== */
.legal-main {
    max-width: 900px;
    margin: 0 auto;
    padding: 16px 24px 60px;
}

.legal-card {
    background: var(--white);
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    padding: 48px 56px;
    border: 1px solid rgba(255, 255, 255, 0.8);
}

.legal-title {
    font-size: 30px;
    font-weight: 800;
    letter-spacing: -0.5px;
    margin-bottom: 8px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.legal-updated {
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 32px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border);
}

.legal-updated strong {
    color: var(--text-mid);
}

/* ===== 章节 ===== */
.legal-section {
    margin-bottom: 28px;
}

.legal-section:last-child {
    margin-bottom: 0;
}

.legal-section h2 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 12px;
    padding-left: 12px;
    border-left: 3px solid var(--primary);
}

.legal-section p {
    font-size: 14px;
    color: var(--text-mid);
    margin-bottom: 8px;
    line-height: 1.8;
}

.legal-section p:last-child {
    margin-bottom: 0;
}

.legal-section ul {
    list-style: none;
    padding-left: 4px;
    margin-top: 8px;
}

.legal-section ul li {
    font-size: 14px;
    color: var(--text-mid);
    padding: 4px 0 4px 20px;
    position: relative;
    line-height: 1.7;
}

.legal-section ul li::before {
    content: '•';
    color: var(--primary);
    font-weight: 700;
    position: absolute;
    left: 6px;
    top: 4px;
}

.legal-section strong {
    color: var(--text-dark);
    font-weight: 600;
}

.legal-section a {
    color: var(--primary);
    text-decoration: none;
    border-bottom: 1px dashed var(--primary);
}

.legal-section a:hover {
    color: var(--primary-dark);
}

/* ===== 高亮提示框 ===== */
.legal-callout {
    background: rgba(43, 95, 215, 0.05);
    border-left: 3px solid var(--primary);
    padding: 14px 18px;
    border-radius: 0 var(--radius) var(--radius) 0;
    margin: 16px 0;
    font-size: 13px;
    color: var(--text-mid);
}

.legal-callout strong {
    color: var(--primary);
}

/* ===== 底部联系 ===== */
.legal-footer {
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
    text-align: center;
    font-size: 13px;
    color: var(--text-light);
}

.legal-footer a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

/* ===== 页内切换 ===== */
.legal-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    background: var(--bg);
    padding: 6px;
    border-radius: var(--radius-btn);
}

.legal-tabs a {
    flex: 1;
    text-align: center;
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-mid);
    padding: 10px 16px;
    border-radius: 20px;
    transition: var(--transition);
}

.legal-tabs a.active {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    box-shadow: 0 4px 12px rgba(43, 95, 215, 0.25);
}

.legal-tabs a:not(.active):hover {
    color: var(--primary);
    background: var(--white);
}

/* ===== 响应式 ===== */
@media (max-width: 640px) {
    .legal-header {
        padding: 16px 20px;
    }

    .legal-main {
        padding: 8px 16px 40px;
    }

    .legal-card {
        padding: 28px 22px;
    }

    .legal-title {
        font-size: 24px;
    }

    .legal-section h2 {
        font-size: 16px;
    }
}