/* ==================== 全局样式 ==================== */
:root {
    --primary: #2196F3;
    --primary-dark: #1976D2;
    --primary-light: #BBDEFB;
    --success: #4CAF50;
    --success-dark: #388E3C;
    --warning: #FF9800;
    --warning-dark: #F57C00;
    --danger: #F44336;
    --danger-dark: #D32F2F;
    --bg: #F0F2F5;
    --card-bg: #FFFFFF;
    --sidebar-bg: #1a237e;
    --sidebar-hover: #283593;
    --sidebar-active: #3949ab;
    --text: #212121;
    --text-light: #757575;
    --text-white: #FFFFFF;
    --border: #E0E0E0;
    --shadow: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-lg: 0 4px 20px rgba(0,0,0,0.12);
    --radius: 10px;
    --radius-sm: 6px;
    --transition: all 0.2s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei',
                 'PingFang SC', sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    overflow-x: hidden;
}

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

/* ==================== 侧边栏 ==================== */
.sidebar {
    width: 240px;
    background: linear-gradient(180deg, #1a237e 0%, #283593 100%);
    color: var(--text-white);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
    transition: var(--transition);
    box-shadow: 2px 0 10px rgba(0,0,0,0.15);
}

.sidebar-logo {
    padding: 28px 24px 20px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    font-size: 32px;
    line-height: 1;
}

.logo-text h1 {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: 1px;
}

.logo-text span {
    font-size: 12px;
    opacity: 0.7;
}

.sidebar-nav {
    flex: 1;
    padding: 16px 12px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: 8px;
    color: rgba(255,255,255,0.75);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
    cursor: pointer;
}

.nav-item:hover {
    background: var(--sidebar-hover);
    color: var(--text-white);
}

.nav-item.active {
    background: var(--sidebar-active);
    color: var(--text-white);
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.nav-icon {
    font-size: 18px;
    width: 24px;
    text-align: center;
}

.sidebar-footer {
    padding: 16px 24px;
    border-top: 1px solid rgba(255,255,255,0.1);
    font-size: 11px;
    opacity: 0.5;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logout-btn {
    font-size: 18px;
    text-decoration: none;
    opacity: 0.7;
    transition: opacity 0.2s;
    cursor: pointer;
}

.logout-btn:hover {
    opacity: 1;
}

/* ==================== 移动端菜单按钮 ==================== */
.menu-toggle {
    display: none;
    position: fixed;
    top: 12px;
    left: 12px;
    z-index: 200;
    background: var(--primary);
    color: white;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 8px;
    font-size: 20px;
    cursor: pointer;
    box-shadow: var(--shadow);
}

/* ==================== 主内容区 ==================== */
.main-content {
    flex: 1;
    margin-left: 240px;
    padding: 28px 32px;
    max-width: 1400px;
    width: 100%;
}

.page {
    display: none;
}

.page.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.page-header {
    margin-bottom: 24px;
}

.page-header h2 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text);
}

.page-header p {
    color: var(--text-light);
    margin-top: 4px;
    font-size: 14px;
}

/* ==================== 统计卡片 ==================== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 28px;
}

.stat-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
}

.stat-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.stat-value {
    font-size: 36px;
    font-weight: 800;
    color: var(--primary);
    line-height: 1.2;
}

.stat-label {
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
    margin-top: 8px;
}

.stat-desc {
    font-size: 12px;
    color: var(--text-light);
    margin-top: 4px;
}

/* ==================== 最近记录区域 ==================== */
.recent-section {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 20px 24px;
    box-shadow: var(--shadow);
}

.recent-section h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
}

/* ==================== 表格 ==================== */
.table-container {
    overflow-x: auto;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

.table-container.small {
    max-height: 240px;
    overflow-y: auto;
}

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

thead {
    background: #FAFAFA;
    position: sticky;
    top: 0;
    z-index: 1;
}

th {
    padding: 12px 14px;
    text-align: center;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 2px solid var(--border);
    white-space: nowrap;
}

td {
    padding: 10px 14px;
    text-align: center;
    font-size: 13px;
    border-bottom: 1px solid #F5F5F5;
}

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

tbody tr:hover {
    background: #F5F8FF;
}

tbody tr.selected {
    background: #E3F2FD;
}

/* ==================== 工具栏 ==================== */
.toolbar {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.toolbar-right {
    margin-left: auto;
    display: flex;
    gap: 10px;
}

.search-input {
    padding: 8px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 13px;
    outline: none;
    transition: var(--transition);
    width: 200px;
}

.search-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(33,150,243,0.1);
}

.date-input {
    width: 160px;
}

/* ==================== 按钮 ==================== */
.btn {
    padding: 8px 18px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
}

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

.btn-primary {
    background: var(--primary);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background: var(--primary-dark);
}

.btn-success {
    background: var(--success);
    color: white;
}

.btn-success:hover:not(:disabled) {
    background: var(--success-dark);
}

.btn-warning {
    background: var(--warning);
    color: white;
}

.btn-warning:hover:not(:disabled) {
    background: var(--warning-dark);
}

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

.btn-danger:hover:not(:disabled) {
    background: var(--danger-dark);
}

.btn-secondary {
    background: #E0E0E0;
    color: var(--text);
}

.btn-secondary:hover:not(:disabled) {
    background: #BDBDBD;
}

/* ==================== 人脸注册页 ==================== */
.register-layout {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: 20px;
}

.register-camera-panel,
.register-form-panel {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
}

.register-form-panel h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
}

/* ==================== 摄像头容器 ==================== */
.camera-container {
    position: relative;
    width: 100%;
    aspect-ratio: 4/3;
    background: #1a1a2e;
    border-radius: var(--radius-sm);
    overflow: hidden;
    margin-bottom: 14px;
}

.camera-container video,
.camera-container canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.camera-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: rgba(255,255,255,0.5);
}

.placeholder-icon {
    font-size: 48px;
    margin-bottom: 12px;
}

.camera-placeholder p {
    font-size: 14px;
}

.camera-controls {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.capture-count {
    margin-left: auto;
    font-size: 13px;
    color: var(--text-light);
}

.capture-count strong {
    color: var(--primary);
    font-size: 16px;
}

/* ==================== 表单 ==================== */
.form-group {
    margin-bottom: 14px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 5px;
}

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

.form-group input {
    width: 100%;
    padding: 9px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 13px;
    outline: none;
    transition: var(--transition);
}

.form-group input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(33,150,243,0.1);
}

.form-actions {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

.register-tips {
    margin-top: 16px;
    padding: 12px;
    background: #FFF8E1;
    border-radius: var(--radius-sm);
    font-size: 12px;
    color: #795548;
    line-height: 1.6;
}

/* ==================== 实时识别页 ==================== */
.recognition-layout {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 20px;
}

.recognition-camera-panel,
.recognition-info-panel {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
}

.recognition-info-panel h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
}

.result-display {
    text-align: center;
    padding: 24px 16px;
    background: #F8F9FA;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    min-height: 120px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.result-name {
    font-size: 28px;
    font-weight: 700;
    color: var(--text);
}

.result-name.known {
    color: var(--success);
}

.result-name.unknown {
    color: var(--danger);
}

.result-info {
    font-size: 13px;
    color: var(--text-light);
    margin-top: 6px;
}

.result-confidence {
    font-size: 16px;
    font-weight: 600;
    color: var(--success);
    margin-top: 8px;
}

.recent-recog h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 10px;
}

/* ==================== 弹窗 ==================== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--card-bg);
    border-radius: var(--radius);
    width: 90%;
    max-width: 480px;
    box-shadow: var(--shadow-lg);
    animation: modalIn 0.2s ease;
}

@keyframes modalIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 24px;
    border-bottom: 1px solid var(--border);
}

.modal-header h3 {
    font-size: 16px;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-light);
    padding: 0;
    line-height: 1;
}

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

.modal-body {
    padding: 20px 24px;
}

.modal-footer {
    padding: 14px 24px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

/* ==================== Toast 消息 ==================== */
.reinforce-layout {
    display: flex;
    gap: 20px;
}

.reinforce-layout .camera-container {
    flex: 1;
    min-width: 200px;
}

.reinforce-layout .camera-container video {
    width: 100%;
    border-radius: 8px;
    background: #000;
}

.reinforce-layout .camera-placeholder {
    aspect-ratio: 4/3;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: #f0f0f0;
    border-radius: 8px;
    color: #999;
}

.reinforce-layout .camera-placeholder .placeholder-icon {
    font-size: 48px;
    margin-bottom: 8px;
}

.reinforce-controls {
    display: flex;
    flex-direction: column;
    gap: 10px;
    min-width: 130px;
    flex-shrink: 0;
}

.reinforce-progress {
    padding: 8px 12px;
    background: #f0f8ff;
    border-radius: 6px;
    text-align: center;
    color: #333;
}

@media (max-width: 500px) {
    .reinforce-layout {
        flex-direction: column;
    }

    .reinforce-controls {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 8px;
    }

    .reinforce-controls .btn {
        flex: 1;
        min-width: 0;
        font-size: 13px;
        padding: 8px 6px;
    }

    .reinforce-controls .form-group {
        width: 100%;
    }

    #reinforceModal .modal-content {
        max-width: 95vw !important;
        margin: 10px;
    }
}

.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    padding: 12px 20px;
    border-radius: var(--radius-sm);
    color: white;
    font-size: 13px;
    font-weight: 500;
    box-shadow: var(--shadow-lg);
    animation: toastIn 0.3s ease;
    max-width: 360px;
}

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

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

.toast.warning {
    background: var(--warning);
}

@keyframes toastIn {
    from { opacity: 0; transform: translateX(40px); }
    to { opacity: 1; transform: translateX(0); }
}

/* ==================== 分页信息 ==================== */
.pagination-info {
    margin-top: 12px;
    font-size: 12px;
    color: var(--text-light);
    text-align: right;
}

/* ==================== 响应式 ==================== */
@media (max-width: 1024px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .register-layout {
        grid-template-columns: 1fr;
    }

    .recognition-layout {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
        padding: 16px;
    }

    .menu-toggle {
        display: block;
    }

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

    .stat-value {
        font-size: 28px;
    }

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

    .toolbar-right {
        margin-left: 0;
    }

    .search-input {
        width: 100%;
    }

    .page-header h2 {
        font-size: 20px;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .camera-controls {
        flex-direction: column;
    }

    .camera-controls .btn {
        width: 100%;
    }
}