/* ============================================
   基础重置 & 变量
   ============================================ */
:root {
    --primary: #4CAF50;
    --primary-dark: #388E3C;
    --secondary: #2196F3;
    --danger: #f44336;
    --warning: #FF9800;
    --bg: #f0f2f5;
    --card-bg: #fff;
    --text: #333;
    --text-light: #888;
    --border: #e0e0e0;
    --radius: 10px;
    --shadow: 0 2px 12px rgba(0,0,0,0.08);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

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

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 16px;
}

/* ============================================
   导航栏
   ============================================ */
.navbar {
    background: var(--primary);
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.nav-brand {
    color: #fff !important;
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 1px;
}

.nav-menu {
    list-style: none;
    display: flex;
    gap: 4px;
}

.nav-menu a {
    color: rgba(255,255,255,0.9);
    padding: 8px 14px;
    border-radius: 6px;
    font-size: 0.95rem;
    transition: background 0.2s;
    display: block;
}
.nav-menu a:hover {
    background: rgba(255,255,255,0.2);
    color: #fff;
}

/* 汉堡菜单按钮 */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}
.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: #fff;
    border-radius: 2px;
    transition: transform 0.3s;
}

/* ============================================
   主内容区
   ============================================ */
.main-content {
    padding: 24px 16px 40px;
}

/* ============================================
   卡片
   ============================================ */
.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 24px;
    margin-bottom: 20px;
}

.card-title {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text);
    border-left: 4px solid var(--primary);
    padding-left: 12px;
}

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

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    color: #555;
    font-size: 0.95rem;
}

.form-input {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
    background: #fafafa;
    font-family: inherit;
}
.form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(76,175,80,0.15);
    background: #fff;
}

.form-input[type="date"] {
    min-height: 42px;
}

.form-hint {
    font-size: 0.82rem;
    color: var(--text-light);
    margin-top: 4px;
}

.form-row {
    display: flex;
    gap: 12px;
    align-items: center;
}

.btn {
    display: inline-block;
    padding: 10px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
    font-family: inherit;
}

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

.btn-secondary {
    background: var(--secondary);
    color: #fff;
}

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

.btn-block {
    width: 100%;
    display: block;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* ============================================
   提示信息
   ============================================ */
.alert {
    padding: 12px 18px;
    border-radius: 8px;
    margin-bottom: 18px;
    font-size: 0.95rem;
}

.alert-error {
    background: #ffebee;
    color: #c62828;
    border: 1px solid #ffcdd2;
}

.alert-success {
    background: #e8f5e9;
    color: #2e7d32;
    border: 1px solid #c8e6c9;
}

.alert-info {
    background: #e3f2fd;
    color: #1565c0;
    border: 1px solid #bbdefb;
}

/* ============================================
   统计卡片网格
   ============================================ */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 20px;
}

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

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-top: 4px;
}

.stat-unit {
    font-size: 0.85rem;
    font-weight: 400;
    color: var(--text-light);
}

/* ============================================
   表格
   ============================================ */
.table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

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

th, td {
    padding: 10px 14px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    font-size: 0.92rem;
}

th {
    background: #fafafa;
    font-weight: 600;
    color: #555;
    position: sticky;
    top: 0;
}

tr:hover td {
    background: #f5f5f5;
}

/* ============================================
   图表区域
   ============================================ */
.chart-container {
    position: relative;
    width: 100%;
    max-height: 400px;
    margin-bottom: 20px;
}

.chart-container canvas {
    width: 100% !important;
}

.charts-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

/* ============================================
   过滤器工具栏
   ============================================ */
.filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: flex-end;
    margin-bottom: 20px;
}

.filter-bar .form-group {
    margin-bottom: 0;
    min-width: 120px;
    flex: 1;
}

.filter-bar .btn {
    flex-shrink: 0;
    align-self: flex-end;
    height: 42px;
    line-height: 1;
}

/* ============================================
   登录/注册页面
   ============================================ */
.auth-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 80vh;
}

.auth-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 36px 28px;
    width: 100%;
    max-width: 420px;
}

.auth-card h2 {
    text-align: center;
    margin-bottom: 24px;
    color: var(--primary);
}

.auth-card .auth-link {
    text-align: center;
    margin-top: 16px;
    font-size: 0.92rem;
}

/* ============================================
   仪表盘
   ============================================ */
.welcome-section {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 20px;
}

.welcome-section h2 {
    font-size: 1.4rem;
}

.quick-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.bmi-indicator {
    display: flex;
    align-items: baseline;
    gap: 8px;
}

.bmi-value {
    font-size: 2.5rem;
    font-weight: 700;
}

.bmi-normal { color: var(--primary); }
.bmi-under { color: var(--secondary); }
.bmi-over { color: var(--warning); }
.bmi-obese { color: var(--danger); }

/* ============================================
   记录页面
   ============================================ */
.unit-toggle {
    display: inline-flex;
    background: #e0e0e0;
    border-radius: 8px;
    padding: 3px;
}

.unit-toggle button {
    padding: 8px 20px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.92rem;
    background: transparent;
    color: #666;
    transition: all 0.2s;
    font-family: inherit;
}

.unit-toggle button.active {
    background: #fff;
    color: var(--text);
    font-weight: 600;
    box-shadow: 0 1px 3px rgba(0,0,0,0.12);
}

.bmi-preview {
    background: #f0f7ff;
    border: 1px solid #bbdefb;
    border-radius: var(--radius);
    padding: 16px;
    text-align: center;
    margin-top: 16px;
}

/* ============================================
   设置页面
   ============================================ */
.profile-form {
    max-width: 500px;
}

/* ============================================
   时段选择器
   ============================================ */
.time-slot-bar {
    display: flex;
    gap: 8px;
}

.time-slot-btn {
    flex: 1;
    padding: 12px 8px;
    border: 2px solid var(--border);
    border-radius: 10px;
    cursor: pointer;
    background: #fafafa;
    text-align: center;
    transition: all 0.2s;
    font-family: inherit;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.time-slot-btn:hover {
    border-color: var(--secondary);
    background: #f0f7ff;
}

.time-slot-btn.active {
    border-color: var(--primary);
    background: #e8f5e9;
    color: var(--primary-dark);
    font-weight: 600;
}

.slot-icon { font-size: 1.3rem; }
.slot-label { font-size: 0.85rem; }

.slot-badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
}

.slot-morning { background: #fff3e0; color: #e65100; }
.slot-noon { background: #fff8e1; color: #f57f17; }
.slot-afternoon { background: #e8f5e9; color: #2e7d32; }
.slot-night { background: #e3f2fd; color: #1565c0; }

/* ============================================
   记录表格操作
   ============================================ */
.row-actions {
    white-space: nowrap;
    display: flex;
    gap: 8px;
}

.btn-edit, .btn-del {
    padding: 4px 12px;
    border-radius: 6px;
    font-size: 0.82rem;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    border: none;
    font-family: inherit;
    transition: all 0.15s;
}

.btn-edit {
    background: #e3f2fd;
    color: #1565c0;
}
.btn-edit:hover { background: #bbdefb; }

.btn-del {
    background: #ffebee;
    color: #c62828;
}
.btn-del:hover { background: #ffcdd2; }

.row-editing td {
    background: #fffde7 !important;
}

.delete-form {
    display: inline;
    margin: 0;
}

/* ============================================
   周期对比面板
   ============================================ */
.period-compare {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 12px;
}

.period-card {
    background: #fafafa;
    border-radius: 8px;
    padding: 16px;
    text-align: center;
    border: 1px solid var(--border);
}

.period-card .period-label {
    font-size: 0.82rem;
    color: var(--text-light);
    margin-bottom: 6px;
}

.period-card .period-value {
    font-size: 1.3rem;
    font-weight: 600;
}

.period-card .period-change {
    font-size: 0.82rem;
    margin-top: 2px;
}

/* ============================================
   时段复选框
   ============================================ */
.slot-checkboxes {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    align-items: center;
    padding-top: 4px;
}

.slot-checkbox {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    cursor: pointer;
    padding: 2px 4px;
    border-radius: 6px;
    transition: background 0.15s;
    font-size: 0.88rem;
    user-select: none;
}

.slot-checkbox:hover {
    background: #f0f0f0;
}

.slot-checkbox input[type="checkbox"] {
    accent-color: var(--primary);
    width: 16px;
    height: 16px;
    margin: 0;
}

.slot-clear {
    font-size: 0.8rem;
    color: var(--danger);
    margin-left: 6px;
    text-decoration: underline;
}
.slot-clear:hover { color: #b71c1c; }

/* ============================================
   分页
   ============================================ */
.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 20px;
}

.pagination a, .pagination span {
    padding: 8px 14px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.9rem;
    color: var(--text);
    background: #fff;
}

.pagination a:hover { background: var(--primary); color: #fff; border-color: var(--primary); }
.pagination .current { background: var(--primary); color: #fff; border-color: var(--primary); font-weight: 600; }

/* ============================================
   响应式设计 - 平板/桌面
   ============================================ */
@media (min-width: 768px) {
    .charts-grid {
        grid-template-columns: 1fr 1fr;
    }

    .charts-grid .chart-full {
        grid-column: 1 / -1;
    }

    .auth-card {
        padding: 48px 40px;
    }

    .stats-grid {
        grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    }

    .nav-menu a {
        font-size: 0.95rem;
    }
}

/* ============================================
   响应式设计 - 手机端
   ============================================ */
@media (max-width: 767px) {
    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 56px;
        left: 0;
        right: 0;
        background: var(--primary-dark);
        padding: 8px 0;
        box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-menu a {
        padding: 12px 20px;
        border-radius: 0;
        font-size: 0.95rem;
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 10px;
    }

    .stat-value {
        font-size: 1.5rem;
    }

    .stat-card {
        padding: 14px;
    }

    .card {
        padding: 16px;
    }

    .filter-bar {
        flex-direction: column;
    }

    .filter-bar .form-group {
        width: 100%;
    }

    .welcome-section {
        flex-direction: column;
        align-items: flex-start;
    }

    .quick-actions {
        width: 100%;
    }
    .quick-actions .btn {
        flex: 1;
        text-align: center;
    }

    .form-row {
        flex-direction: column;
        align-items: stretch;
    }

    th, td {
        padding: 8px 10px;
        font-size: 0.85rem;
    }
}