:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #2a2a2a;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --accent: #6366f1;
    --accent-hover: #4f46e5;
    --error: #ef4444;
    --success: #10b981;
    --border: #333;
    --shadow: rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

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

header {
    background-color: var(--bg-secondary);
    padding: 1rem 0;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 2px 4px var(--shadow);
}

header h1 {
    font-size: 1.5rem;
    font-weight: 600;
}

.auth-container {
    max-width: 400px;
    margin: 4rem auto;
    padding: 2rem;
    background-color: var(--bg-secondary);
    border-radius: 8px;
    box-shadow: 0 4px 6px var(--shadow);
}

.auth-container h2 {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 1.75rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
}

input[type="email"],
input[type="password"],
input[type="text"] {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: border-color 0.2s;
}

input[type="email"]:focus,
input[type="password"]:focus,
input[type="text"]:focus {
    outline: none;
    border-color: var(--accent);
}

button {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--accent);
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
}

button:hover {
    background-color: var(--accent-hover);
}

button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.checkbox-group {
    display: flex;
    align-items: center;
    margin-top: 1rem;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.checkbox-group input[type="checkbox"] {
    width: auto;
    margin-right: 0.5rem;
    cursor: pointer;
}

.error-message {
    color: var(--error);
    font-size: 0.875rem;
    margin-top: 0.5rem;
}

.success-message {
    color: var(--success);
    font-size: 0.875rem;
    margin-top: 0.5rem;
}

.dashboard {
    padding: 2rem 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background-color: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--shadow);
}

.stat-card h3 {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.stat-card .value {
    font-size: 2rem;
    font-weight: 600;
}

.period-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.period-card {
    background-color: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--shadow);
}

.period-card h3 {
    font-size: 1.125rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
    text-align: center;
}

.period-metrics {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.metric {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border);
}

.metric:last-child {
    border-bottom: none;
}

.metric-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.metric-value {
    font-weight: 600;
    font-size: 1rem;
}

.debt-positive {
    color: var(--error);
}

.debt-negative {
    color: var(--success);
}

.period-info {
    margin-top: 1rem;
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-style: italic;
}

.entries-container {
    background-color: var(--bg-secondary);
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--shadow);
    overflow: hidden;
}

.entries-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
}

.entries-header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.entries-header-content h2 {
    flex: 1;
    margin: 0;
}

.add-entry-btn {
    background-color: var(--accent);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    white-space: nowrap;
    flex-shrink: 0;
    flex-basis: 0;
}

.add-entry-btn:hover {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.add-entry-btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.add-entry-btn::before {
    content: '+';
    font-size: 1.1rem;
    font-weight: bold;
    margin-right: 0.4rem;
}

.entries-list {
    max-height: 600px;
    overflow-y: auto;
}

.day-group {
    border-bottom: 1px solid var(--border);
}

.day-group:last-child {
    border-bottom: none;
}

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

.day-date {
    font-weight: 600;
    font-size: 1.1rem;
}

.day-stats {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.day-total {
    color: var(--accent);
    font-weight: 500;
}

.day-debt {
    font-weight: 500;
}

.entry-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
    transition: background-color 0.2s;
}

.entry-item:hover {
    background-color: var(--bg-tertiary);
}

.entry-item:last-child {
    border-bottom: none;
}

.entry-content {
    flex: 1;
}

.entry-actions {
    display: flex;
    gap: 0.5rem;
    margin-left: 1rem;
}

.entry-btn {
    padding: 0.375rem 0.75rem;
    font-size: 0.875rem;
    border: 1px solid var(--border);
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
}

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

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

.edit-btn:hover {
    background-color: var(--accent-hover);
}

.delete-btn {
    background-color: transparent;
    color: var(--error);
    border: 1px solid var(--error);
}

.delete-btn:hover {
    background-color: var(--error);
    color: white;
}

.entry-date {
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.entry-details {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.entry-detail {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.entry-note {
    margin-top: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-primary);
    font-style: italic;
}

.rating-stars {
    color: var(--accent);
    font-size: 1.1rem;
    letter-spacing: 0.1rem;
}

.logout-btn {
    background-color: transparent;
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    width: auto;
    font-size: 0.875rem;
}

.logout-btn:hover {
    background-color: var(--bg-tertiary);
}

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

.nav-links {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 0.875rem;
    transition: background-color 0.2s;
}

.nav-link:hover {
    background-color: var(--bg-tertiary);
}

.nav-link.current {
    background-color: var(--accent);
    color: white;
}

.nav-link.current:hover {
    background-color: var(--accent-hover);
}

.charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 2rem;
}

.chart-container {
    background-color: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--shadow);
    height: 400px;
}

.chart-container h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-size: 1.125rem;
}

.chart-container canvas {
    width: 100% !important;
    height: calc(100% - 2rem) !important;
}

@media (max-width: 768px) {
    .auth-container {
        margin: 2rem auto;
        padding: 1.5rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .entries-list {
        max-height: none;
    }
    
    .entry-details {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .entry-item {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .entry-actions {
        margin-left: 0;
        margin-top: 1rem;
        width: 100%;
    }
    
    .entry-btn {
        flex: 1;
    }
    
    header h1 {
        font-size: 1.25rem;
    }
    
    .day-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    .day-date {
        font-size: 1rem;
    }
    
    .nav-links {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .charts-grid {
        grid-template-columns: 1fr;
    }
    
    .chart-container {
        height: 350px;
    }
    
    .period-stats {
        grid-template-columns: 1fr;
    }
}

.loading {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
}

.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

.empty-state h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.timeline-options,
.filter-options {
    background-color: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--shadow);
    margin-bottom: 2rem;
}

.timeline-options h3,
.filter-options h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1rem;
}

.date-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1rem;
}

.option-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.option-group label {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
}

.option-group select,
.option-group input[type="date"] {
    padding: 0.5rem;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-primary);
    font-size: 0.875rem;
}

.preset-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.preset-buttons button {
    padding: 0.5rem 1rem;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-primary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: background-color 0.2s;
    width: auto;
}

.preset-buttons button:hover {
    background-color: var(--accent);
    color: white;
}

.form-actions {
    display: flex;
    gap: 1rem;
}

.form-actions button {
    background-color: var(--accent);
    color: white;
    padding: 0.75rem 2rem;
    width: auto;
}

.form-actions button:hover {
    background-color: var(--accent-hover);
}

.form-actions button[onclick*="resetOptions"] {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
}

.form-actions button[onclick*="resetOptions"]:hover {
    background-color: var(--border);
}

.timeline-info {
    background-color: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--shadow);
    margin-bottom: 2rem;
}

.timeline-info h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.timeline-info p {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.timeline-info p:last-child {
    margin-bottom: 0;
}

.timeline-container {
    background-color: var(--bg-secondary);
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--shadow);
    padding: 1rem;
    overflow-x: auto;
    overflow-y: hidden;
}

.timeline-image,
.timeline-canvas {
    display: block;
    border: 1px solid var(--border);
    border-radius: 4px;
    height: auto;
    max-width: none; /* Allow images to be their natural width */
}

.timeline-canvas {
    cursor: crosshair;
}

.timeline-tooltip {
    position: absolute;
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    padding: 0.75rem;
    border-radius: 4px;
    border: 1px solid var(--border);
    font-size: 0.875rem;
    line-height: 1.4;
    box-shadow: 0 4px 6px var(--shadow);
    z-index: 1000;
    display: none;
    pointer-events: none;
    max-width: 250px;
}

/* Modal styles */
.modal {
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.75);
    display: flex !important;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.modal[style*="display: none"] {
    display: none !important;
}

.modal-content {
    background-color: var(--bg-secondary);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.modal-header h2 {
    margin: 0;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s;
}

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

.form-buttons {
    display: flex;
    gap: 0.75rem;
    justify-content: space-between;
    margin-top: 1.5rem;
}

.form-buttons .cancel-btn {
    margin-right: auto;
}

.modal-btn {
    padding: 0.5rem 1.5rem;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

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

.save-btn:hover {
    background-color: var(--accent-hover);
}

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

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

/* Delete confirmation modal */
.modal-confirm {
    max-width: 400px;
}

.modal-body {
    margin-bottom: 1.5rem;
}

.modal-body p {
    margin: 0.5rem 0;
}

.text-muted {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.delete-confirm-btn {
    background-color: var(--error);
    color: white;
}

.delete-confirm-btn:hover {
    background-color: #d32f2f;
}

/* Duration display */
.duration-display {
    background-color: var(--bg-tertiary);
    padding: 0.75rem;
    border-radius: 4px;
    margin-bottom: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 1px solid var(--border);
}

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

#duration-text {
    font-weight: 600;
    color: var(--accent);
    font-size: 1.1rem;
}

/* Modal error display */
.modal-error {
    background-color: rgba(244, 67, 54, 0.1);
    color: var(--error);
    padding: 0.75rem;
    border-radius: 4px;
    margin-bottom: 1rem;
    border: 1px solid rgba(244, 67, 54, 0.3);
    font-size: 0.875rem;
}

.form-row {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.form-row .form-group {
    flex: 1;
    margin-bottom: 0;
}

.rating-group {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    font-size: 1.5rem;
}

.rating-star {
    cursor: pointer;
    color: var(--text-secondary);
    transition: color 0.2s;
    background: none;
    border: none;
    padding: 0.25rem;
}

.rating-star:hover,
.rating-star.active {
    color: var(--accent);
}

textarea.form-control,
input.form-control {
    width: 100%;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 0.5rem;
    border-radius: 4px;
    font-family: inherit;
}

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

input.form-control[readonly] {
    background-color: var(--bg-primary);
    color: var(--text-secondary);
    cursor: not-allowed;
}

@media (max-width: 768px) {
    .form-row {
        flex-direction: column;
    }
}