/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --danger-color: #dc2626;
    --danger-hover: #b91c1c;
    --success-color: #16a34a;
    --warning-color: #ea580c;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --known-color: #22c55e;
    --unknown-color: #ef4444;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    width: 100%;
}

/* 头部 */
header {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 20px 30px;
    margin-bottom: 30px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

header h1 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
}

.nav {
    display: flex;
    gap: 10px;
}

.nav a {
    padding: 10px 20px;
    border-radius: 8px;
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: all 0.2s;
}

.nav a:hover {
    background: var(--bg-color);
    color: var(--primary-color);
}

.nav a.active {
    background: var(--primary-color);
    color: white;
}

/* 主内容 */
main {
    flex: 1;
}

/* 控制面板 */
.control-panel {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.status-row {
    display: flex;
    gap: 30px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.status-item {
    display: flex;
    align-items: center;
    gap: 10px;
}

.status-label {
    font-weight: 500;
    color: var(--text-secondary);
}

.status-value {
    font-weight: 600;
    color: var(--text-primary);
}

.status-value.running {
    color: var(--success-color);
}

.status-value.stopped {
    color: var(--danger-color);
}

.status-value.detected {
    color: var(--known-color);
}

.button-row {
    display: flex;
    gap: 10px;
}

/* 按钮 */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

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

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

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

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

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

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

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

.btn-small {
    padding: 8px 16px;
    font-size: 13px;
}

/* 视频容器 */
.video-container {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.video-wrapper {
    position: relative;
    background: #000;
    border-radius: 8px;
    overflow: hidden;
    aspect-ratio: 4 / 3;
}

.video-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #1e293b;
}

.placeholder-content {
    text-align: center;
    color: var(--text-secondary);
}

.placeholder-content svg {
    color: var(--text-secondary);
    margin-bottom: 10px;
}

#video-canvas {
    width: 100%;
    height: 100%;
    display: block;
}

.legend {
    display: flex;
    gap: 20px;
    margin-top: 15px;
    justify-content: center;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
}

.legend-color {
    width: 20px;
    height: 20px;
    border-radius: 4px;
}

.legend-color.known {
    background: var(--known-color);
}

.legend-color.unknown {
    background: var(--unknown-color);
}

/* 信息面板 */
.info-panel {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.info-panel h3 {
    font-size: 18px;
    margin-bottom: 15px;
}

.info-panel ul {
    list-style-position: inside;
    color: var(--text-secondary);
}

.info-panel li {
    margin-bottom: 8px;
}

/* 人脸管理页面 */
.management-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

@media (max-width: 768px) {
    .management-content {
        grid-template-columns: 1fr;
    }
}

.add-person-section,
.person-list-section {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.add-person-section h2,
.person-list-section h2 {
    font-size: 20px;
    margin-bottom: 20px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

/* 表单 */
.add-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

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

.form-group label {
    font-weight: 600;
    font-size: 14px;
    color: var(--text-primary);
}

.form-group input[type="text"] {
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.2s;
}

.form-group input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
}

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

/* 文件上传 */
.file-upload {
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
}

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

.file-upload.drag-over {
    border-color: var(--primary-color);
    background: rgba(37, 99, 235, 0.05);
}

.upload-label {
    color: var(--text-secondary);
}

.upload-label svg {
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.upload-label p {
    margin-bottom: 5px;
}

.file-types {
    font-size: 12px;
    color: var(--text-secondary);
}

.preview {
    text-align: center;
}

.preview img {
    max-width: 100%;
    max-height: 200px;
    border-radius: 8px;
    margin-bottom: 10px;
}

.remove-btn {
    padding: 8px 16px;
    background: var(--danger-color);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 13px;
}

/* 消息 */
.message {
    padding: 12px 20px;
    border-radius: 8px;
    font-weight: 500;
}

.message.success {
    background: #dcfce7;
    color: var(--success-color);
}

.message.error {
    background: #fee2e2;
    color: var(--danger-color);
}

/* 人员列表 */
.person-list {
    min-height: 200px;
}

.loading,
.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    margin: 0 auto 15px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.empty-state svg {
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.person-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 15px;
}

.person-card {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: all 0.2s;
}

.person-card:hover {
    border-color: var(--primary-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.person-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 18px;
    flex-shrink: 0;
}

.person-info {
    flex: 1;
}

.person-name {
    font-weight: 600;
    color: var(--text-primary);
}

.person-delete-btn {
    padding: 6px 12px;
    background: var(--danger-color);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 12px;
    transition: background 0.2s;
}

.person-delete-btn:hover {
    background: var(--danger-hover);
}

/* 页脚 */
footer {
    text-align: center;
    padding: 20px;
    color: var(--text-secondary);
    font-size: 14px;
    margin-top: 30px;
}

/* 响应式 */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    header {
        flex-direction: column;
        text-align: center;
    }

    .status-row {
        flex-direction: column;
        gap: 10px;
    }

    .button-row {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }
}