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

:root {
    --primary: #4f6ef7;
    --primary-dark: #3b57d4;
    --bg: #f0f2f7;
    --surface: #ffffff;
    --border: #e2e6ed;
    --text: #1a1f36;
    --text-muted: #6b7280;
    --success: #16a34a;
    --warning: #d97706;
    --danger: #dc2626;
    --radius: 6px;
    --shadow: 0 1px 3px rgba(0,0,0,0.08);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--surface);
    min-height: 100vh;
    color: var(--text);
    font-size: 14px;
}

/* ===== 布局 ===== */

.container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    width: 100%;
    background: var(--surface);
}

header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 0 24px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
}

header h1 {
    font-size: 18px;
    font-weight: 600;
    color: var(--primary);
    letter-spacing: -0.3px;
}

.header-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.header-info span {
    font-size: 13px;
    color: var(--text-muted);
}

.header-info button {
    background: none;
    color: var(--text-muted);
    border: 1px solid var(--border);
    padding: 5px 14px;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 13px;
    transition: all 0.15s;
}

.header-info button:hover {
    color: var(--danger);
    border-color: var(--danger);
}

nav {
    display: flex;
    gap: 2px;
    padding: 8px 0 0;
}

nav button {
    background: none;
    color: var(--text-muted);
    border: none;
    border-bottom: 2px solid transparent;
    padding: 8px 16px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    transition: all 0.15s;
    margin-bottom: -1px;
}

nav button:hover {
    color: var(--primary);
}

nav button.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

main {
    padding: 28px 24px;
    flex: 1;
}

section {
    display: none;
}

section.active {
    display: block;
}

/* ===== 标题 ===== */

h2 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 20px;
}

h3 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text);
    margin: 24px 0 12px;
}

/* ===== 统计卡片 ===== */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px 24px;
    box-shadow: var(--shadow);
}

.stat-card h3 {
    font-size: 12px;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin: 0 0 8px 0;
}

.stat-card p {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary);
    margin: 0;
    line-height: 1;
}

/* ===== 表单 ===== */

.form-group {
    margin-bottom: 14px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    color: var(--text);
    font-weight: 500;
    font-size: 13px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 8px 10px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 14px;
    font-family: inherit;
    color: var(--text);
    background: var(--surface);
    transition: border-color 0.15s, box-shadow 0.15s;
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79,110,247,0.1);
}

.form-group textarea {
    min-height: 72px;
    resize: vertical;
}

/* ===== 按钮 ===== */

button[type="submit"] {
    background: var(--primary);
    color: white;
    border: none;
    padding: 9px 20px;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: background 0.15s;
}

button[type="submit"]:hover {
    background: var(--primary-dark);
}

/* 筛选区通用按钮 */
.filter-section button[type="button"] {
    padding: 8px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    background: var(--surface);
    color: var(--text);
    transition: all 0.15s;
    white-space: nowrap;
}

.filter-section button[type="button"]:hover {
    border-color: var(--primary);
    color: var(--primary);
}

/* ===== 筛选区 ===== */

.filter-section {
    background: #fafbfc;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px 16px;
    margin-bottom: 16px;
}

.filter-section .form-group {
    margin-bottom: 0;
    min-width: 120px;
}

.filter-section .form-group input,
.filter-section .form-group select {
    padding: 7px 10px;
}

/* ===== 工时录入模式 ===== */

.entry-mode-switch {
    display: flex;
    gap: 8px;
    margin-bottom: 14px;
}

.entry-mode-switch button {
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
    padding: 7px 14px;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 13px;
}

.entry-mode-switch button.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

#single-entry-panel,
#weekly-entry-panel {
    margin-bottom: 18px;
}

.week-toolbar {
    display: flex;
    gap: 10px;
    align-items: flex-end;
    flex-wrap: wrap;
}

.week-range-tip {
    margin: 10px 0 8px;
    color: var(--text-muted);
    font-size: 13px;
}

.week-grid-wrap {
    overflow-x: auto;
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

#week-entry-table {
    min-width: 1120px;
}

#week-entry-table select,
#week-entry-table textarea,
#week-entry-table input {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 6px 8px;
    font-size: 12px;
    font-family: inherit;
    background: white;
}

#week-entry-table textarea {
    min-height: 34px;
    height: 34px;
    resize: vertical;
}

#week-entry-table .day-cell {
    min-width: 76px;
}

#week-entry-table .day-cell input {
    text-align: right;
}

#week-entry-table .row-total {
    font-weight: 600;
    color: var(--primary);
}

#week-total-row td {
    font-weight: 600;
    background: #f7f9ff;
}

#week-total-row td.low-total {
    color: #991b1b;
    background: #fee2e2;
}

.week-warning {
    margin-top: 10px;
    font-size: 13px;
    color: #b45309;
}

.week-warning.error {
    color: #991b1b;
}

.week-row-remove {
    background: #dc3545;
    color: white;
    border: none;
    border-radius: 4px;
    padding: 5px 10px;
    cursor: pointer;
    font-size: 12px;
}

/* ===== 表格 ===== */

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

thead {
    background: #fafbfc;
}

th {
    padding: 10px 12px;
    text-align: left;
    font-weight: 600;
    color: var(--text-muted);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.4px;
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
}

td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--border);
    color: var(--text);
    vertical-align: middle;
}

tbody tr:last-child td {
    border-bottom: none;
}

tbody tr:hover {
    background: #fafbfc;
}

/* ===== 状态徽章 ===== */

.pending {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 100px;
    font-size: 12px;
    font-weight: 500;
    background: #fef3c7;
    color: #92400e;
}

.approved {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 100px;
    font-size: 12px;
    font-weight: 500;
    background: #dcfce7;
    color: #166534;
}

.rejected {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 100px;
    font-size: 12px;
    font-weight: 500;
    background: #fee2e2;
    color: #991b1b;
}

/* ===== 操作按钮 ===== */

.approve-btn {
    background: var(--success);
    color: white;
    border: none;
    padding: 4px 12px;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 12px;
    font-weight: 500;
    transition: opacity 0.15s;
}

.approve-btn:hover {
    opacity: 0.85;
}

.reject-btn {
    background: var(--danger);
    color: white;
    border: none;
    padding: 4px 12px;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 12px;
    font-weight: 500;
    transition: opacity 0.15s;
}

.reject-btn:hover {
    opacity: 0.85;
}

/* ===== 分页 ===== */

.pagination {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-top: 1px solid var(--border);
    margin-top: 4px;
    font-size: 13px;
    color: var(--text-muted);
}

.pagination button {
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
    padding: 6px 14px;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 13px;
    transition: all 0.15s;
}

.pagination button:hover:not(:disabled) {
    border-color: var(--primary);
    color: var(--primary);
}

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

/* ===== 弹窗 ===== */

.modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background: var(--surface);
    padding: 24px;
    border-radius: 8px;
    width: 90%;
    max-width: 480px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 8px 32px rgba(0,0,0,0.16);
}

.modal-content h3 {
    margin: 0 0 18px 0;
    font-size: 16px;
}

.form-actions {
    display: flex;
    gap: 8px;
    margin-top: 18px;
}

.form-actions button {
    flex: 1;
}

.form-actions button[type="button"] {
    background: var(--surface);
    color: var(--text-muted);
    border: 1px solid var(--border);
    padding: 9px 20px;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.15s;
}

.form-actions button[type="button"]:hover {
    border-color: var(--text-muted);
    color: var(--text);
}

/* ===== 辅助 ===== */

.hidden {
    display: none !important;
}