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

:root {
    --primary-color: #4a90e2;
    --primary-hover: #357abd;
    --secondary-color: #6c757d;
    --secondary-hover: #5a6268;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --background: #f5f7fa;
    --surface: #ffffff;
    --text-primary: #333333;
    --text-secondary: #666666;
    --border-color: #e0e0e0;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
}

header {
    background: var(--surface);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
    box-shadow: var(--shadow);
}

header h1 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

nav {
    display: flex;
    gap: 0.5rem;
}

.nav-btn {
    padding: 0.5rem 1rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1rem;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
}

.nav-btn:hover {
    color: var(--text-primary);
}

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

main {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

/* Views */
.view {
    display: none;
}

.view.active {
    display: block;
}

.view-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.view-header h2 {
    font-size: 1.8rem;
    color: var(--text-primary);
    margin-bottom: 0.3rem;
}

.view-header a {
    font-size: 0.9rem;
    color: var(--primary-color);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
}

.view-header a:hover {
    text-decoration: underline;
}

.view-header a::after {
    content: '↗';
    font-size: 0.8rem;
}

/* Buttons */
.btn-primary, .btn-secondary, .btn-danger {
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 500;
}

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

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

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

.btn-secondary:hover {
    background: var(--secondary-hover);
}

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

.btn-danger:hover {
    background: #c82333;
}

.btn-sm {
    padding: 0.4rem 0.8rem;
    font-size: 0.9rem;
}

/* Videos Grid */
.videos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.video-card {
    background: var(--surface);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.2s;
    cursor: pointer;
}

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

.video-thumbnail {
    width: 100%;
    height: 180px;
    object-fit: cover;
    background: #ddd;
}

.video-card-content {
    padding: 1rem;
}

.video-card-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.video-card-info {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.video-card-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
}

.video-status {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: 500;
}

.video-status.downloading {
    background: #ffc107;
    color: #000;
}

.video-status.completed {
    background: var(--success-color);
    color: white;
}

.video-status.failed {
    background: var(--danger-color);
    color: white;
}

/* Video Detail */
.video-detail-container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
}

.video-player-section {
    background: var(--surface);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.segments-section {
    background: var(--surface);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.section-header {
    margin-bottom: 1rem;
}

.section-header h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}

.help-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Segments List */
.segment-item {
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    margin-bottom: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
}

.segment-item:hover {
    background: #f9f9f9;
    border-color: var(--primary-color);
}

.segment-item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.segment-name {
    font-weight: 600;
    font-size: 1rem;
}

.segment-time {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.segment-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.segment-status {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
}

.segment-status.processing {
    background: #ffc107;
    color: #000;
}

.segment-status.completed {
    background: var(--success-color);
    color: white;
}

/* Washing Machines List */
#washing-machines-list {
    display: grid;
    gap: 1rem;
}

.washing-machine-card {
    background: var(--surface);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    cursor: pointer;
    transition: all 0.2s;
}

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

.washing-machine-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.washing-machine-description {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.washing-machine-meta {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

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

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--surface);
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-content.large {
    max-width: 700px;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 1.3rem;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
}

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

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
}

.modal-error {
    color: var(--danger-color);
    font-size: 0.9rem;
    margin-top: 0.5rem;
    display: none;
}

.modal-error.active {
    display: block;
}

/* Form Elements */
.input-text, .input-textarea, .input-select, .input-number {
    width: 100%;
    padding: 0.6rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
    font-family: inherit;
    margin-bottom: 1rem;
}

.input-text:focus, .input-textarea:focus, .input-select:focus, .input-number:focus {
    outline: none;
    border-color: var(--primary-color);
}

.input-textarea {
    resize: vertical;
    min-height: 80px;
}

.input-number {
    width: auto;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.segment-time-info {
    text-align: center;
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-top: 1rem;
}

/* Washing Machine Builder */
#wm-step-builder {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

#wm-step-builder .input-select {
    flex: 1;
    margin-bottom: 0;
}

#wm-step-builder .input-number {
    width: 80px;
    margin-bottom: 0;
}

#wm-steps-preview {
    margin-top: 1rem;
}

.wm-step-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.8rem;
    background: #f9f9f9;
    border-radius: 4px;
    margin-bottom: 0.5rem;
}

.wm-step-info {
    flex: 1;
}

.wm-step-name {
    font-weight: 600;
}

.wm-step-repeat {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Spinner */
.spinner {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 2000;
}

.spinner.hidden {
    display: none;
}

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

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

/* Empty State */
.empty-state {
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
}

.empty-state h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}

/* Responsive */
@media (max-width: 768px) {
    .video-detail-container {
        grid-template-columns: 1fr;
    }

    .videos-grid {
        grid-template-columns: 1fr;
    }

    main {
        padding: 1rem;
    }
}