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

:root {
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --bg: #f3f4f6;
    --card: #ffffff;
    --text: #1f2937;
    --text-light: #6b7280;
    --border: #e5e7eb;
    --sidebar-bg: #111827;
    --sidebar-text: #9ca3af;
    --danger: #dc2626;
    --success: #16a34a;
    --warning: #d97706;
    --radius: 10px;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 14px;
    line-height: 1.6;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ========== 登录页 ========== */
.login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
    padding: 20px;
}

.login-box {
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    width: 100%;
    max-width: 400px;
    padding: 40px 36px;
}

.login-logo {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    background: linear-gradient(135deg, var(--primary), #8b5cf6);
    color: #fff;
    font-size: 30px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
}

.login-title {
    text-align: center;
    font-size: 20px;
    margin-bottom: 24px;
    color: var(--text);
}

.login-foot { text-align: center; margin-top: 18px; font-size: 13px; }
.login-foot a { color: var(--text-light); }
.login-foot a:hover { color: var(--primary); }

/* ========== 布局 ========== */
.admin-layout { display: flex; min-height: 100vh; }

.admin-sidebar {
    width: 210px;
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    flex-shrink: 0;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
}

.admin-logo {
    padding: 22px 20px;
    font-size: 18px;
    font-weight: 700;
    color: #fff;
    border-bottom: 1px solid #1f2937;
}

.admin-nav { padding: 12px 10px; }

.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 11px 14px;
    border-radius: 8px;
    margin-bottom: 4px;
    color: var(--sidebar-text);
    font-size: 14px;
    transition: all 0.2s;
}

.nav-item:hover { color: #fff; background: #1f2937; }
.nav-item.active { color: #fff; background: var(--primary); }

.nav-icon { font-size: 12px; width: 16px; text-align: center; }

.admin-main { flex: 1; display: flex; flex-direction: column; min-width: 0; }

.admin-topbar {
    background: var(--card);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
    height: 58px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 28px;
    position: sticky;
    top: 0;
    z-index: 10;
}

.topbar-title { font-weight: 600; font-size: 15px; }

.topbar-actions { display: flex; align-items: center; gap: 16px; font-size: 13.5px; }

.topbar-user { color: var(--text-light); }

.btn-link { color: var(--primary); }
.btn-link:hover { text-decoration: underline; }

.admin-content { padding: 24px 28px 40px; max-width: 1200px; width: 100%; }

/* ========== 提示 ========== */
.alert {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 18px;
    font-size: 14px;
}

.alert-info { background: #eef2ff; color: var(--primary-dark); border: 1px solid #c7d2fe; }
.alert-error { background: #fef2f2; color: var(--danger); border: 1px solid #fecaca; }

/* ========== 统计卡片 ========== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
    text-align: center;
}

.stat-card.warn .stat-num { color: var(--warning); }

.stat-num { font-size: 30px; font-weight: 700; color: var(--primary); line-height: 1.2; }
.stat-label { color: var(--text-light); font-size: 13px; margin-top: 4px; }

/* ========== 面板与表格 ========== */
.dash-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 900px) { .dash-grid { grid-template-columns: 1fr; } }

.panel {
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px 24px;
    margin-bottom: 20px;
}

.panel-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 14px;
}

.panel-head h3 { font-size: 15px; }

.data-table { width: 100%; border-collapse: collapse; }

.data-table th {
    text-align: left;
    font-size: 12.5px;
    color: var(--text-light);
    font-weight: 600;
    padding: 10px 12px;
    border-bottom: 2px solid var(--border);
    white-space: nowrap;
}

.data-table td {
    padding: 12px;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
    word-break: break-all;
}

.data-table tr:hover td { background: #fafafa; }
.data-table tr:last-child td { border-bottom: none; }

.table-link { color: var(--primary); }
.table-link:hover { text-decoration: underline; }

.muted { color: var(--text-light); font-size: 13px; }
.strong { font-weight: 600; }
.block { display: block; }

/* ========== 标签 ========== */
.tag {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 500;
    white-space: nowrap;
}

.tag-green { background: #dcfce7; color: var(--success); }
.tag-gray { background: #f3f4f6; color: var(--text-light); }
.tag-orange { background: #fef3c7; color: var(--warning); }

/* ========== 按钮 ========== */
.btn {
    display: inline-block;
    padding: 8px 16px;
    border: 1px solid var(--border);
    background: #fff;
    border-radius: 8px;
    font-size: 13.5px;
    cursor: pointer;
    color: var(--text);
    transition: all 0.2s;
}

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

.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); color: #fff; }

.btn-danger { color: var(--danger); border-color: #fecaca; background: #fff; }
.btn-danger:hover { background: var(--danger); border-color: var(--danger); color: #fff; }

.btn-sm { padding: 5px 12px; font-size: 12.5px; }
.btn-block { width: 100%; margin-top: 4px; text-align: center; }

.btn-reset { color: var(--text-light); }
.btn-reset:hover { border-color: var(--text-light); color: var(--text); }

/* ========== 工具栏 ========== */
.toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 18px;
    flex-wrap: wrap;
}

.toolbar-form { display: flex; gap: 8px; flex-wrap: wrap; }

.toolbar-form input,
.toolbar-form select {
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 13.5px;
    outline: none;
    background: #fff;
}

.toolbar-form input:focus,
.toolbar-form select:focus { border-color: var(--primary); }

/* ========== 表单 ========== */
.form-group { margin-bottom: 16px; }

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 13.5px;
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 9px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    outline: none;
    background: #fff;
    transition: border-color 0.2s;
    resize: vertical;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus { border-color: var(--primary); }

.req { color: var(--danger); }

.help { font-size: 12.5px; color: var(--text-light); margin-top: 6px; }

.form-actions { display: flex; gap: 10px; margin-top: 18px; }

/* 编辑页布局 */
.form-grid {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 20px;
    align-items: start;
}

@media (max-width: 900px) { .form-grid { grid-template-columns: 1fr; } }

.form-main .panel, .side-card { padding: 24px; }

.side-card {
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

.side-card h4 {
    font-size: 14px;
    margin-bottom: 14px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--border);
}

.checkbox-group { display: flex; flex-direction: column; gap: 8px; }

.checkbox-item {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 13.5px;
}

.checkbox-item input { width: auto; }

/* 双栏布局 */
.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    align-items: start;
}

@media (max-width: 900px) { .two-col { grid-template-columns: 1fr; } }

.row-actions { display: flex; gap: 6px; align-items: center; }
.row-actions form { display: inline; }

/* ========== 分页 ========== */
.pagination { margin-top: 18px; display: flex; justify-content: flex-end; }
.pagination ul { display: flex; gap: 6px; flex-wrap: wrap; }
.pagination li { list-style: none; }
.pagination a, .pagination span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 32px;
    height: 32px;
    padding: 0 8px;
    border-radius: 6px;
    background: var(--bg);
    color: var(--text-light);
    font-size: 13px;
    transition: all 0.2s;
}
.pagination a:hover { color: var(--primary); }
.pagination .current span { background: var(--primary); color: #fff; }
.pagination .disabled span { opacity: 0.4; }

/* ========== 封面上传 ========== */
.btn-outline { color: var(--primary); border-color: var(--primary); background: #fff; }
.btn-outline:hover { background: var(--primary); color: #fff; }
.btn-danger-ghost { color: var(--danger); border-color: #fecaca; background: #fff; }
.btn-danger-ghost:hover { background: #fef2f2; color: var(--danger); }

.cover-uploader { display: flex; flex-direction: column; gap: 10px; }

.cover-preview {
    width: 100%;
    height: 150px;
    border: 1px dashed var(--border);
    border-radius: 8px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f9fafb;
}

.cover-preview img { width: 100%; height: 100%; object-fit: cover; }

.cover-placeholder { color: var(--text-light); font-size: 13px; }

.cover-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.cover-actions label.btn { cursor: pointer; }

.cover-thumb {
    width: 60px;
    height: 40px;
    object-fit: cover;
    border-radius: 6px;
    display: block;
}