/* ============================================
   极简二级域名出租系统 - 样式表
   设计规范：简约现代、轻量化商务风
   配色：主色60% + 辅色30% + 点缀10%
   主色：#3D5A80(钢蓝) / #F5F6FA(浅底)
   辅色：#98C1D9(浅蓝) / #E8ECF1(浅灰)
   点缀：#EE6C4D(暖珊瑚) / #293241(深文字)
   ============================================ */

/* ---- CSS变量 ---- */
:root {
    --c-primary: #3D5A80;
    --c-primary-light: #4A6FA5;
    --c-secondary: #98C1D9;
    --c-accent: #EE6C4D;
    --c-accent-hover: #D85A3B;
    --c-bg: #F5F6FA;
    --c-surface: #FFFFFF;
    --c-text: #293241;
    --c-text-muted: #6B7B8D;
    --c-border: #E0E5EC;
    --c-success: #4CAF7D;
    --c-warning: #F0A63A;
    --c-danger: #E5534B;
    --c-info: #3D5A80;
    --radius: 8px;
    --radius-sm: 4px;
    --shadow-sm: 0 1px 3px rgba(41,50,65,0.08);
    --shadow-md: 0 4px 12px rgba(41,50,65,0.1);
    --shadow-lg: 0 8px 24px rgba(41,50,65,0.12);
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

/* ---- 全局重置 ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
    font-family: var(--font-sans);
    color: var(--c-text);
    background: var(--c-bg);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}
a { color: var(--c-primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--c-primary-light); }
img { max-width: 100%; height: auto; }

/* ---- 容器 ---- */
.container { max-width: 1140px; margin: 0 auto; padding: 0 20px; }
.container-sm { max-width: 480px; margin: 0 auto; padding: 0 20px; }
.container-md { max-width: 720px; margin: 0 auto; padding: 0 20px; }

/* ---- 导航栏 ---- */
.navbar {
    background: var(--c-surface);
    border-bottom: 1px solid var(--c-border);
    padding: 0 24px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}
.navbar-brand {
    font-size: 18px;
    font-weight: 700;
    color: var(--c-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}
.navbar-brand .icon { font-size: 24px; }
.navbar-nav {
    display: flex;
    align-items: center;
    gap: 4px;
    list-style: none;
}
.navbar-nav a {
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    color: var(--c-text-muted);
    font-size: 14px;
    font-weight: 500;
}
.navbar-nav a:hover, .navbar-nav a.active {
    color: var(--c-primary);
    background: rgba(61,90,128,0.06);
}
.navbar-nav .btn-accent {
    color: #fff;
    background: var(--c-accent);
}
.navbar-nav .btn-accent:hover {
    background: var(--c-accent-hover);
    color: #fff;
}

/* 移动端菜单按钮 */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    color: var(--c-text);
    cursor: pointer;
}

/* ---- 按钮 ---- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 600;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    line-height: 1.4;
}
.btn-sm { padding: 6px 14px; font-size: 13px; }
.btn-lg { padding: 14px 28px; font-size: 16px; }
.btn-primary { background: var(--c-primary); color: #fff; }
.btn-primary:hover { background: var(--c-primary-light); color: #fff; }
.btn-accent { background: var(--c-accent); color: #fff; }
.btn-accent:hover { background: var(--c-accent-hover); color: #fff; }
.btn-secondary { background: var(--c-secondary); color: var(--c-text); }
.btn-secondary:hover { background: #88B4CC; }
.btn-outline {
    background: transparent;
    border: 1.5px solid var(--c-border);
    color: var(--c-text-muted);
}
.btn-outline:hover { border-color: var(--c-primary); color: var(--c-primary); }
.btn-danger { background: var(--c-danger); color: #fff; }
.btn-danger:hover { background: #D04440; color: #fff; }
.btn-success { background: var(--c-success); color: #fff; }
.btn-success:hover { background: #3E9B6C; color: #fff; }
.btn[disabled] { opacity: 0.5; cursor: not-allowed; }

/* ---- 卡片 ---- */
.card {
    background: var(--c-surface);
    border-radius: var(--radius);
    border: 1px solid var(--c-border);
    padding: 24px;
    transition: var(--transition);
}
.card:hover { box-shadow: var(--shadow-md); }
.card-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--c-text);
    margin-bottom: 8px;
}
.card-body { font-size: 14px; color: var(--c-text-muted); }

/* 套餐卡片特殊样式 */
.package-card {
    position: relative;
    overflow: hidden;
    border: 2px solid var(--c-border);
}
.package-card.popular {
    border-color: var(--c-accent);
}
.package-card .badge-popular {
    position: absolute;
    top: 12px;
    right: -28px;
    background: var(--c-accent);
    color: #fff;
    font-size: 12px;
    padding: 2px 32px;
    transform: rotate(45deg);
    font-weight: 600;
}
.package-card .price {
    font-size: 32px;
    font-weight: 800;
    color: var(--c-primary);
}
.package-card .price .unit {
    font-size: 14px;
    font-weight: 400;
    color: var(--c-text-muted);
}

/* ---- 表单 ---- */
.form-group { margin-bottom: 20px; }
.form-label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--c-text);
    margin-bottom: 6px;
}
.form-input, .form-select, .form-textarea {
    width: 100%;
    padding: 10px 14px;
    font-size: 14px;
    border: 1.5px solid var(--c-border);
    border-radius: var(--radius);
    background: var(--c-surface);
    color: var(--c-text);
    transition: var(--transition);
    outline: none;
    font-family: var(--font-sans);
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
    border-color: var(--c-primary);
    box-shadow: 0 0 0 3px rgba(61,90,128,0.1);
}
.form-input.error { border-color: var(--c-danger); }
.form-hint {
    font-size: 12px;
    color: var(--c-text-muted);
    margin-top: 4px;
}
.form-textarea { min-height: 100px; resize: vertical; }
.form-file { padding: 8px; }

/* 域名组合输入 */
.domain-input-group {
    display: flex;
    align-items: stretch;
    gap: 0;
}
.domain-input-group .form-input {
    border-radius: var(--radius) 0 0 var(--radius);
    flex: 2;
}
.domain-input-group .form-select {
    border-radius: 0 var(--radius) var(--radius) 0;
    border-left: none;
    flex: 1;
    max-width: 180px;
}

/* ---- 表格 ---- */
.table-wrap {
    overflow-x: auto;
    border-radius: var(--radius);
    border: 1px solid var(--c-border);
    background: var(--c-surface);
}
.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}
.table th {
    background: #F0F3F7;
    padding: 12px 16px;
    text-align: left;
    font-weight: 600;
    color: var(--c-text-muted);
    font-size: 13px;
    white-space: nowrap;
}
.table td {
    padding: 12px 16px;
    border-top: 1px solid var(--c-border);
}
.table tr:hover td { background: rgba(61,90,128,0.02); }

/* ---- 状态标签 ---- */
.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}
.badge-success { background: rgba(76,175,125,0.12); color: var(--c-success); }
.badge-warning { background: rgba(240,166,58,0.12); color: var(--c-warning); }
.badge-danger { background: rgba(229,83,75,0.12); color: var(--c-danger); }
.badge-info { background: rgba(61,90,128,0.1); color: var(--c-info); }
.badge-secondary { background: rgba(107,123,141,0.1); color: var(--c-text-muted); }

/* ---- 提示消息 ---- */
.alert {
    padding: 14px 18px;
    border-radius: var(--radius);
    font-size: 14px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.alert-success { background: rgba(76,175,125,0.1); color: var(--c-success); border: 1px solid rgba(76,175,125,0.2); }
.alert-danger { background: rgba(229,83,75,0.08); color: var(--c-danger); border: 1px solid rgba(229,83,75,0.15); }
.alert-warning { background: rgba(240,166,58,0.1); color: var(--c-warning); border: 1px solid rgba(240,166,58,0.2); }
.alert-info { background: rgba(61,90,128,0.06); color: var(--c-info); border: 1px solid rgba(61,90,128,0.12); }

/* ---- 闪存消息 ---- */
.flash {
    position: fixed;
    top: 80px;
    right: 20px;
    padding: 14px 24px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    z-index: 1000;
    box-shadow: var(--shadow-md);
    animation: slideIn 0.3s ease;
}
.flash-success { background: var(--c-success); color: #fff; }
.flash-error { background: var(--c-danger); color: #fff; }

@keyframes slideIn {
    from { transform: translateX(100px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* ---- Hero区域 ---- */
.hero {
    padding: 60px 0 40px;
    text-align: left;
}
.hero h1 {
    font-size: 36px;
    font-weight: 800;
    color: var(--c-text);
    line-height: 1.3;
    margin-bottom: 16px;
}
.hero h1 span { color: var(--c-primary); }
.hero p {
    font-size: 16px;
    color: var(--c-text-muted);
    max-width: 500px;
    margin-bottom: 24px;
}
.hero-actions { display: flex; gap: 12px; }

/* ---- 套餐网格 ---- */
.packages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin: 32px 0;
}

/* ---- 页面标题 ---- */
.page-header {
    padding: 32px 0 20px;
    border-bottom: 1px solid var(--c-border);
    margin-bottom: 24px;
}
.page-header h2 {
    font-size: 24px;
    font-weight: 700;
}
.page-header p {
    font-size: 14px;
    color: var(--c-text-muted);
    margin-top: 4px;
}

/* ---- 统计卡片 ---- */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}
.stat-card {
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--radius);
    padding: 20px;
}
.stat-card .stat-label {
    font-size: 13px;
    color: var(--c-text-muted);
    margin-bottom: 4px;
}
.stat-card .stat-value {
    font-size: 28px;
    font-weight: 800;
    color: var(--c-primary);
}
.stat-card .stat-value.accent { color: var(--c-accent); }

/* ---- 分页 ---- */
.pagination {
    display: flex;
    gap: 4px;
    justify-content: center;
    margin-top: 24px;
    list-style: none;
}
.pagination a, .pagination span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    border: 1px solid var(--c-border);
    background: var(--c-surface);
    color: var(--c-text-muted);
    transition: var(--transition);
}
.pagination a:hover { border-color: var(--c-primary); color: var(--c-primary); }
.pagination .active {
    background: var(--c-primary);
    border-color: var(--c-primary);
    color: #fff;
}

/* ---- 页脚 ---- */
.footer {
    margin-top: 60px;
    padding: 24px 0;
    border-top: 1px solid var(--c-border);
    text-align: center;
    font-size: 13px;
    color: var(--c-text-muted);
}

/* ---- 空状态 ---- */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--c-text-muted);
}
.empty-state .icon { font-size: 48px; margin-bottom: 12px; opacity: 0.3; }
.empty-state p { font-size: 14px; }

/* ---- 域名可用性检测 ---- */
.check-result {
    margin-top: 8px;
    font-size: 13px;
    font-weight: 500;
}
.check-result.available { color: var(--c-success); }
.check-result.taken { color: var(--c-danger); }
.check-result.checking { color: var(--c-text-muted); }

/* ---- 管理后台侧边栏 ---- */
.admin-layout {
    display: flex;
    min-height: 100vh;
}
.admin-sidebar {
    width: 240px;
    background: var(--c-text);
    color: #fff;
    padding: 20px 0;
    flex-shrink: 0;
}
.admin-sidebar .sidebar-brand {
    padding: 0 20px 20px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    font-size: 16px;
    font-weight: 700;
    color: var(--c-secondary);
}
.admin-sidebar .sidebar-nav {
    list-style: none;
    margin-top: 12px;
}
.admin-sidebar .sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 20px;
    color: rgba(255,255,255,0.6);
    font-size: 14px;
    transition: var(--transition);
}
.admin-sidebar .sidebar-nav a:hover,
.admin-sidebar .sidebar-nav a.active {
    background: rgba(255,255,255,0.08);
    color: #fff;
}
.admin-sidebar .sidebar-nav .icon { font-size: 18px; width: 24px; text-align: center; }
.admin-sidebar .sidebar-section {
    padding: 12px 20px 6px;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: rgba(255,255,255,0.3);
    margin-top: 8px;
}
.admin-main {
    flex: 1;
    padding: 24px;
    background: var(--c-bg);
    overflow-y: auto;
}
.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}
.admin-header h2 { font-size: 20px; font-weight: 700; }

/* ---- 模态框 ---- */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(41,50,65,0.5);
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}
.modal-overlay.show { opacity: 1; visibility: visible; }
.modal {
    background: var(--c-surface);
    border-radius: var(--radius);
    padding: 24px;
    width: 90%;
    max-width: 480px;
    box-shadow: var(--shadow-lg);
    transform: translateY(20px);
    transition: var(--transition);
}
.modal-overlay.show .modal { transform: translateY(0); }
.modal-title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 16px;
}
.modal-actions {
    display: flex;
    gap: 8px;
    justify-content: flex-end;
    margin-top: 20px;
}

/* ---- 实名认证图片预览 ---- */
.upload-area {
    border: 2px dashed var(--c-border);
    border-radius: var(--radius);
    padding: 24px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
}
.upload-area:hover { border-color: var(--c-primary); background: rgba(61,90,128,0.02); }
.upload-area .icon { font-size: 32px; color: var(--c-text-muted); margin-bottom: 8px; }
.upload-area p { font-size: 13px; color: var(--c-text-muted); }
.upload-area input[type="file"] { display: none; }
.upload-area img {
    max-height: 120px;
    margin-top: 8px;
    border-radius: var(--radius-sm);
}

/* ---- 登录/注册卡片 ---- */
.auth-card {
    max-width: 420px;
    margin: 60px auto;
    padding: 36px;
}
.auth-card h2 {
    text-align: center;
    margin-bottom: 8px;
}
.auth-card .subtitle {
    text-align: center;
    color: var(--c-text-muted);
    font-size: 14px;
    margin-bottom: 28px;
}
.auth-footer {
    text-align: center;
    margin-top: 20px;
    font-size: 13px;
    color: var(--c-text-muted);
}

/* ---- 响应式适配 ---- */
@media (max-width: 768px) {
    .navbar-nav { display: none; }
    .navbar-nav.show {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--c-surface);
        border-bottom: 1px solid var(--c-border);
        padding: 12px;
        box-shadow: var(--shadow-md);
    }
    .menu-toggle { display: block; }
    .hero h1 { font-size: 26px; }
    .hero { padding: 40px 0 24px; }
    .packages-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .domain-input-group { flex-direction: column; }
    .domain-input-group .form-input { border-radius: var(--radius); }
    .domain-input-group .form-select {
        border-radius: var(--radius);
        border-left: 1.5px solid var(--c-border);
        border-top: none;
        max-width: 100%;
    }
    .admin-layout { flex-direction: column; }
    .admin-sidebar {
        width: 100%;
        padding: 12px;
    }
    .admin-sidebar .sidebar-nav { display: flex; flex-wrap: wrap; gap: 4px; }
    .admin-sidebar .sidebar-section { display: none; }
    .admin-sidebar .sidebar-nav a { padding: 6px 12px; font-size: 13px; }
    .table { font-size: 12px; }
    .table th, .table td { padding: 8px 10px; }
}

@media (max-width: 480px) {
    .container { padding: 0 12px; }
    .hero h1 { font-size: 22px; }
    .btn-lg { padding: 12px 20px; font-size: 14px; }
    .stats-grid { grid-template-columns: 1fr 1fr; }
    .card { padding: 16px; }
}