:root {
    --primary: #0066cc;
    --primary-dark: #0052a3;
    --success: #28a745;
    --error: #dc3545;
    --info: #17a2b8;
    --text: #212529;
    --border: #dee2e6;
    --light-bg: #f8fafc;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
    font-size: 15px;
    line-height: 1.6;
    color: var(--text);
    background: #f4f6f9;
}

.wrap {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 15px;
}

/* ==================== 头部 ==================== */
.site-header {
    background: white;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    padding: 14px 0;
}

.site-title a {
    font-size: 1.45rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
}

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

.nav-block {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.nav-primary a,
.nav-reports a {
    padding: 9px 16px;
    border-radius: 8px;
    font-size: 0.95rem;
    transition: all 0.2s ease;
}

.nav-primary a:hover,
.nav-reports a:hover {
    background: #f1f5f9;
    color: var(--primary);
}

.nav-em {
    font-weight: 600;
    color: var(--primary) !important;
    background: #f0f7ff;
}

.nav-reports-label {
    font-size: 0.85rem;
    color: #64748b;
    margin-right: 8px;
    align-self: center;
}

/* ==================== 主内容 & Card ==================== */
.main-content {
    padding: 25px 0 50px;
}

.card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
    padding: 24px;
    margin-bottom: 28px;
}

/* ==================== 表单 ==================== */
label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    color: #374151;
}

input[type="text"],
input[type="number"],
input[type="date"],
select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 15px;
}

input:focus,
select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.15);
}

.row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 18px;
    margin-bottom: 20px;
}

/* ==================== 按钮 ==================== */
.btn {
    padding: 10px 20px;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(0, 102, 204, 0.25);
}

.btn-secondary {
    background: #e2e8f0;
    color: #334155;
}

.btn-secondary:hover {
    background: #cbd5e1;
}

/* ==================== Flash 消息 ==================== */
.flash {
    padding: 14px 18px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-weight: 500;
}

.flash-success { background: #d1fae5; color: #166534; border: 1px solid #86efac; }
.flash-error   { background: #fee2e2; color: #b91c1c; border: 1px solid #f87171; }
.flash-info    { background: #e0f2fe; color: #0c4a6e; border: 1px solid #67e8f9; }

/* ==================== 表格 ==================== */
table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 12px 14px;
    text-align: left;
    border-bottom: 1px solid #e2e8f0;
}

th {
    background: #f8fafc;
    font-weight: 600;
    color: #475569;
    font-size: 0.9rem;
}

tr:hover {
    background: #f8fafc;
}

.table-wrap {
    overflow-x: auto;
    border: 1px solid #e2e8f0;
    border-radius: 10px;
}

/* ==================== 其他 ==================== */
.muted {
    color: #64748b;
    font-size: 0.92rem;
}

.site-footer {
    text-align: center;
    padding: 25px 0;
    color: #64748b;
    font-size: 0.9rem;
    border-top: 1px solid #e2e8f0;
    margin-top: 40px;
}

/* 移动端适配 */
@media (max-width: 640px) {
    .header-inner {
        flex-direction: column;
        align-items: flex-start;
    }
    .row {
        grid-template-columns: 1fr;
    }
}