/* ============================================================
   公共样式 - CSS 变量 / Reset / 通用组件
   ============================================================ */

/* 侧边栏 / 登录页自定义 LOGO 图片 */
.sidebar-logo .logo-img {
    max-width: 180px;
    object-fit: contain;
}
.login-logo img {
    border-radius: 12px;
}

:root {
    /* 主色 - 靛蓝（管理后台） */
    --color-primary: #4F46E5;
    --color-primary-light: #6366F1;
    --color-primary-lighter: #818CF8;
    --color-primary-dark: #4338CA;

    /* 渠道主题 - 青绿 */
    --color-channel: #10B981;
    --color-channel-light: #34D399;
    --color-channel-dark: #059669;

    /* 功能色 */
    --color-success: #10B981;
    --color-danger: #EF4444;
    --color-warning: #F59E0B;
    --color-info: #3B82F6;

    /* 背景色 */
    --bg-page: #F8FAFC;
    --bg-card: #FFFFFF;
    --bg-sidebar: #1E293B;
    --bg-sidebar-hover: #334155;
    --bg-sidebar-active: #4F46E5;

    /* 文字 */
    --text-primary: #1E293B;
    --text-secondary: #64748B;
    --text-tertiary: #94A3B8;
    --text-inverse: #FFFFFF;

    /* 边框 */
    --border-color: #E2E8F0;
    --border-color-light: #F1F5F9;

    /* 阴影 */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.08), 0 2px 4px -1px rgba(0,0,0,0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);

    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;

    /* 间距 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* 字体 */
    --font-family: "PingFang SC", -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;

    /* 过渡 */
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    font-family: var(--font-family);
    font-size: 14px;
    color: var(--text-primary);
    background: var(--bg-page);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

ul, ol {
    list-style: none;
}

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

/* ============================================================
   按钮
   ============================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
    line-height: 1.4;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: var(--text-inverse);
    box-shadow: 0 2px 4px rgba(79, 70, 229, 0.2);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
    box-shadow: 0 4px 8px rgba(79, 70, 229, 0.3);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border-color: var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.btn-success {
    background: linear-gradient(135deg, var(--color-success), var(--color-channel-light));
    color: var(--text-inverse);
}

.btn-danger {
    background: linear-gradient(135deg, var(--color-danger), #F87171);
    color: var(--text-inverse);
}

.btn-warning {
    background: linear-gradient(135deg, var(--color-warning), #FBBF24);
    color: var(--text-inverse);
}

.btn-sm {
    padding: 4px 10px;
    font-size: 12px;
}

.btn-lg {
    padding: 12px 24px;
    font-size: 16px;
}

.btn-block {
    width: 100%;
}

/* ============================================================
   卡片
   ============================================================ */
.card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: var(--transition);
    padding: 20px 10px;
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

.card-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.card-body {
    padding: 20px;
}

/* ============================================================
   表格
   ============================================================ */
.table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-card);
}

.table th {
    padding: 12px 16px;
    text-align: left;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: var(--bg-page);
    border-bottom: 1px solid var(--border-color);
    white-space: nowrap;
}

.table td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border-color-light);
    color: var(--text-primary);
}

.table tbody tr {
    transition: var(--transition);
}

.table tbody tr:hover {
    background: var(--border-color-light);
}

.table-cover {
    width: 48px;
    height: 64px;
    border-radius: var(--radius-sm);
    object-fit: cover;
    background: var(--border-color-light);
}

/* ============================================================
   表单
   ============================================================ */
.form-group {
    margin-bottom: 18px;
}

.form-label {
    display: block;
    margin-bottom: 6px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-label .required {
    color: var(--color-danger);
    margin-left: 2px;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 9px 12px;
    font-size: 14px;
    color: var(--text-primary);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: var(--transition);
    outline: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-textarea {
    min-height: 90px;
    resize: vertical;
}

.form-hint {
    margin-top: 4px;
    font-size: 12px;
    color: var(--text-tertiary);
}

/* ============================================================
   标签 / 徽章
   ============================================================ */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 10px;
    font-size: 12px;
    font-weight: 500;
    border-radius: var(--radius-full);
    line-height: 1.6;
}

.badge-success { background: rgba(16, 185, 129, 0.1); color: var(--color-success); }
.badge-danger  { background: rgba(239, 68, 68, 0.1); color: var(--color-danger); }
.badge-warning { background: rgba(245, 158, 11, 0.1); color: var(--color-warning); }
.badge-info    { background: rgba(59, 130, 246, 0.1); color: var(--color-info); }
.badge-default { background: var(--border-color-light); color: var(--text-secondary); }

/* ============================================================
   分页
   ============================================================ */
.pagination {
    display: flex;
    align-items: center;
    gap: 6px;
    justify-content: center;
    padding: 20px 0;
    flex-wrap: wrap;
}

.pagination a,
.pagination span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 32px;
    height: 32px;
    padding: 0 8px;
    font-size: 13px;
    color: var(--text-secondary);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
}

.pagination a:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.pagination .pagination-current {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: var(--text-inverse);
    border-color: transparent;
}

.pagination .disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.pagination-total {
    border: none !important;
    background: transparent !important;
    color: var(--text-tertiary) !important;
    margin-right: 10px;
}

.pagination-ellipsis {
    border: none !important;
    background: transparent !important;
}

/* ============================================================
   工具类
   ============================================================ */
.text-center { text-align: center; }
.text-right  { text-align: right; }
.text-success { color: var(--color-success); }
.text-danger  { color: var(--color-danger); }
.text-warning { color: var(--color-warning); }
.text-secondary { color: var(--text-secondary); }

.flex { display: flex; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.flex-center { display: flex; justify-content: center; align-items: center; }
.gap-sm { gap: 8px; }
.gap-md { gap: 16px; }
.mt-sm { margin-top: 8px; }
.mt-md { margin-top: 16px; }
.mt-lg { margin-top: 24px; }
.mb-md { margin-bottom: 16px; }

/* ============================================================
   弹窗 Modal
   ============================================================ */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-overlay.active {
    display: flex;
    animation: fadeIn 0.2s ease;
}

.modal {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 90%;
    max-width: 520px;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: slideUp 0.25s ease;
}

.modal-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-title {
    font-size: 16px;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 22px;
    color: var(--text-tertiary);
    cursor: pointer;
    line-height: 1;
    padding: 4px;
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: 20px;
    overflow-y: auto;
}

.modal-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--border-color-light);
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

/* ============================================================
   Toast 提示
   ============================================================ */
.toast {
    position: fixed;
    top: 24px;
    left: 50%;
    transform: translateX(-50%);
    padding: 12px 24px;
    background: var(--text-primary);
    color: var(--text-inverse);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 2000;
    font-size: 14px;
    opacity: 0;
    transition: opacity 0.3s, top 0.3s;
    pointer-events: none;
}

.toast.show {
    opacity: 1;
    top: 32px;
}

.toast-success { background: var(--color-success); }
.toast-error { background: var(--color-danger); }