/* CSS Variables for theming */
:root {
    --bg-primary: #f5f7fa;
    --bg-secondary: #ffffff;
    --bg-hover: #f0f2f5;
    --text-primary: #1a1a1a;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-hover: #3a3a3a;
    --text-primary: #f5f5f5;
    --text-secondary: #a0a0a0;
    --border-color: #404040;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 30px 0;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 30px;
}

.header-content h1 {
    font-size: 2.5rem;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

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

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

.btn-icon {
    padding: 10px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    font-size: 1.5rem;
}

/* Cards */
.card {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 30px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

/* Upload Area */
.upload-area {
    text-align: center;
    padding: 60px 20px;
    border: 3px dashed var(--border-color);
    border-radius: 12px;
    transition: all 0.3s;
}

.upload-area.drag-over {
    border-color: var(--accent-color);
    background: var(--bg-hover);
}

.upload-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.upload-hint {
    margin-top: 15px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.upload-progress {
    padding: 20px;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 10px;
}

.progress-fill {
    height: 100%;
    background: var(--accent-color);
    width: 0%;
    animation: indeterminate 1.5s infinite;
}

@keyframes indeterminate {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(400%); }
}

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

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

.stat-card {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 25px;
    display: flex;
    align-items: center;
    gap: 20px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    transition: transform 0.2s;
}

.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.stat-icon {
    font-size: 2.5rem;
}

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

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

/* Controls */
.controls-section {
    margin-bottom: 20px;
}

.controls-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

.control-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-weight: 500;
}

.control-group input,
.control-group select {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1rem;
}

.control-group input:focus,
.control-group select:focus {
    outline: none;
    border-color: var(--accent-color);
}

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

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

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

.timeline {
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border-color);
}

.event-item {
    position: relative;
    padding-left: 70px;
    padding-bottom: 30px;
    padding-top: 5px;
    cursor: pointer;
    transition: all 0.2s;
    min-height: 60px;
}

.event-item:hover {
    background: var(--bg-hover);
    margin: 0 -20px;
    padding-left: 90px;
    padding-right: 20px;
    border-radius: 8px;
}

.event-icon {
    position: absolute;
    left: 18px;
    top: 30px;
    width: 24px;
    height: 24px;
    background: var(--bg-secondary);
    border: 2px solid var(--accent-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    z-index: 1;
}

.event-timestamp {
    display: block;
    margin-bottom: 8px;
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

.event-time-delta {
    color: var(--warning-color);
    font-weight: 500;
}

.event-line-ref {
    background: var(--accent-color);
    color: white;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.75rem;
    margin-left: 8px;
    white-space: nowrap;
}

.event-content {
    clear: both;
}

.event-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 5px;
    color: var(--text-primary);
}

.event-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.event-tag {
    display: inline-block;
    background: var(--bg-primary);
    color: var(--text-secondary);
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 0.85rem;
    margin-top: 8px;
    border: 1px solid var(--border-color);
}

.event-item.hidden {
    display: none;
}

/* State Change Events */
.event-item.event-state {
    border-left: 3px solid var(--accent-color);
    background: var(--bg-hover);
    padding-left: 67px;
    border-radius: 8px;
    margin: 0 -10px;
    padding-right: 10px;
}

.event-item.event-state .event-icon {
    background: var(--accent-color);
    border-color: var(--accent-color);
    color: white;
}

.state-change-box {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 12px;
    margin: 10px 0;
    font-size: 0.9rem;
}

.state-model-badge {
    display: inline-block;
    background: var(--accent-color);
    color: white;
    padding: 3px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.state-change-grid {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.state-field {
    display: flex;
    align-items: center;
    gap: 8px;
}

.state-label {
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
}

.state-field code {
    background: var(--bg-secondary);
    padding: 2px 6px;
    border-radius: 3px;
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    color: var(--accent-color);
}

.state-transition {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px;
    background: var(--bg-secondary);
    border-radius: 4px;
}

.state-old {
    padding: 4px 8px;
    background: var(--error-color);
    color: white;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    opacity: 0.7;
}

.state-arrow {
    color: var(--text-secondary);
    font-weight: bold;
    font-size: 1.2rem;
}

.state-new {
    padding: 4px 8px;
    background: var(--success-color);
    color: white;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    font-weight: 600;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: 12px;
    width: 90%;
    max-width: 900px;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 30px;
    border-bottom: 1px solid var(--border-color);
}

.modal-close {
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--text-secondary);
    cursor: pointer;
    line-height: 1;
}

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

.modal-body {
    padding: 30px;
    overflow-y: auto;
}

.log-context {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
}

.log-context pre {
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
    white-space: pre-wrap;
    word-wrap: break-word;
    color: var(--text-primary);
}

.log-line-highlight {
    background: var(--accent-color);
    color: white;
    padding: 2px 4px;
    border-radius: 4px;
    display: inline-block;
    margin: -2px -4px;
}

/* Footer */
footer {
    text-align: center;
    padding: 30px 0;
    color: var(--text-secondary);
    border-top: 1px solid var(--border-color);
    margin-top: 40px;
}

/* Responsive */
@media (max-width: 768px) {
    .header-content h1 {
        font-size: 1.8rem;
    }

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

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

    .timeline::before {
        left: 15px;
    }

    .event-item {
        padding-left: 45px;
        font-size: 0.9rem;
    }

    .event-icon {
        left: 3px;
        top: 28px;
        width: 20px;
        height: 20px;
        font-size: 0.7rem;
    }

    .event-timestamp {
        font-size: 0.75rem;
    }

    .event-title {
        font-size: 1rem;
    }

    .event-description {
        font-size: 0.85rem;
    }
}