@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --background: #f8fafc;
    --surface: #ffffff;
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --radius: 0.5rem;
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
}

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

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

.app {
    min-height: 100vh;
    max-width: 1200px;
    margin: 0 auto;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-xl);
}

.header h1 {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
    letter-spacing: -0.025em;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 400;
}

.project-controls {
    display: flex;
    gap: var(--space-sm);
}

.icon-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-sm);
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s;
    min-width: 40px;
    height: 40px;
}

.icon-btn:hover {
    background: var(--border-light);
    color: var(--text-primary);
    border-color: var(--text-secondary);
}

.icon-btn svg {
    width: 16px;
    height: 16px;
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal {
    background: var(--surface);
    border-radius: var(--radius);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
    width: 90%;
    max-width: 500px;
    max-height: 80vh;
    overflow: hidden;
}

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

.modal-header h3 {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    padding: var(--space-xs);
    border-radius: var(--radius);
    transition: all 0.2s;
}

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

.modal-content {
    padding: var(--space-lg);
    max-height: 60vh;
    overflow-y: auto;
}

.project-list {
    display: grid;
    gap: var(--space-sm);
}

.project-item {
    padding: var(--space-md);
    background: var(--border-light);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s;
}

.project-item:hover {
    background: var(--border);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.project-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

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

.main {
    display: grid;
    gap: var(--space-xl);
}

.project-section {
    background: var(--surface);
    border-radius: var(--radius);
    padding: var(--space-xl);
    box-shadow: var(--shadow-sm);
}

.project-header {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--space-lg);
    align-items: center;
    margin-bottom: var(--space-xl);
}

.project-name-input {
    padding: var(--space-md);
    border: none;
    background: var(--border-light);
    border-radius: var(--radius);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    transition: background-color 0.2s;
}

.project-name-input:focus {
    outline: none;
    background: var(--surface);
    box-shadow: 0 0 0 2px var(--primary-color);
}

.target-time-section {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.target-time-section label {
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.target-time-input {
    padding: var(--space-sm);
    border: none;
    background: var(--border-light);
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 500;
}

.target-time-input:focus {
    outline: none;
    background: var(--surface);
    box-shadow: 0 0 0 2px var(--primary-color);
}

.streams-section {
    margin-bottom: var(--space-lg);
}

.streams-container {
    display: grid;
    gap: 0;
    margin-bottom: var(--space-lg);
}

.streams-footer {
    display: flex;
    justify-content: flex-end;
}

.stream {
    padding: var(--space-lg);
}

.stream-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-lg);
    gap: var(--space-sm);
}

.stream-name-input {
    min-width: 0;
}

.stream-name-input {
    padding: var(--space-sm);
    border: none;
    background: var(--surface);
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--text-primary);
    flex: 1;
    min-width: 0;
}

.stream-name-input:focus {
    outline: none;
    box-shadow: 0 0 0 2px var(--primary-color);
}

.remove-stream-btn {
    color: var(--text-muted);
    transition: all 0.2s;
}

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

.tasks-container {
    display: grid;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.task {
    display: grid;
    grid-template-columns: auto 1fr auto auto;
    gap: var(--space-sm);
    align-items: center;
    padding: var(--space-xs) var(--space-md);
    background: var(--surface);
    border-radius: var(--radius);
    transition: opacity 0.2s, transform 0.2s, box-shadow 0.2s;
}


.task.dragging {
    opacity: 0.5;
    transform: rotate(2deg);
}

.drag-handle {
    cursor: grab;
    color: var(--text-muted);
    font-size: 1rem;
    padding: var(--space-xs);
    user-select: none;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 20px;
    height: 20px;
    border-radius: var(--radius);
    transition: all 0.2s;
}

.drag-handle:hover {
    background: var(--border-light);
    color: var(--text-secondary);
}

.drag-handle:active {
    cursor: grabbing;
}

.task-name-input {
    padding: var(--space-sm);
    border: none;
    background: var(--border-light);
    border-radius: var(--radius);
    font-weight: 500;
    color: var(--text-primary);
    font-size: 1rem;
}

.task-name-input:focus {
    outline: none;
    background: var(--surface);
    box-shadow: 0 0 0 2px var(--primary-color);
}

.task-duration-input {
    padding: var(--space-sm);
    border: none;
    background: var(--border-light);
    border-radius: var(--radius);
    width: 90px;
    text-align: center;
    font-weight: 500;
    color: var(--text-primary);
    font-size: 1rem;
}

.task-duration-input:focus {
    outline: none;
    background: var(--surface);
    box-shadow: 0 0 0 2px var(--primary-color);
}

.remove-task-btn {
    padding: var(--space-xs) var(--space-sm);
    background: transparent;
    color: var(--text-muted);
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s;
    min-width: 24px;
}

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

.add-task-btn {
    padding: var(--space-sm) var(--space-md);
    background: transparent;
    color: var(--text-secondary);
    border: 1px dashed var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s;
    width: 100%;
    margin-top: var(--space-sm);
}

.add-task-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.add-stream-btn {
    padding: var(--space-md) var(--space-lg);
    background: transparent;
    color: var(--primary-color);
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.2s;
}

.add-stream-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.timeline-section {
    background: var(--surface);
    border-radius: var(--radius);
    padding: var(--space-xl);
    box-shadow: var(--shadow-sm);
}

.timeline-section h2 {
    margin-bottom: var(--space-lg);
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 600;
}

.timeline-container {
    display: grid;
    gap: var(--space-md);
}

.timeline-stream {
    border-left: 3px solid var(--primary-color);
    padding-left: var(--space-md);
}

.timeline-stream h3 {
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
    font-size: 1.125rem;
    font-weight: 600;
}

.timeline-tasks {
    display: grid;
    gap: var(--space-xs);
}

.timeline-task {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-sm) var(--space-md);
    background: var(--border-light);
    border-radius: var(--radius);
}

.timeline-task:last-child {
    margin-bottom: 50px;
}

.task-start-time {
    font-weight: 500;
    color: var(--primary-color);
}

.task-info {
    flex: 1;
}

.timeline-finish {
    background: var(--success);
    color: white;
    font-weight: 600;
}

.timeline-finish .task-start-time {
    color: white;
    font-weight: 600;
}


.btn {
    padding: var(--space-sm) var(--space-lg);
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s;
}

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

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

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

.btn.secondary:hover {
    background: var(--border-light);
    color: var(--text-primary);
}

@media (max-width: 768px) {
    .app {
        padding: var(--space-md) 20px;
    }
    
    .project-section,
    .timeline-section {
        padding: var(--space-lg) 0;
    }
    
    .header {
        flex-direction: column;
        gap: var(--space-md);
        margin-bottom: 0;
        padding: 0;
    }
    
    .header h1 {
        font-size: 1.875rem;
    }
    
    .project-header {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }
    
    .project-name-input {
        font-size: 1.25rem;
    }
    
    .target-time-section {
        justify-content: flex-start;
    }
    
    .streams-container {
        gap: var(--space-md);
    }
    
    
    .stream {
        padding: var(--space-md);
    }
    
    .stream-name-input {
        font-size: 1.125rem;
    }
    
    .task-name-input,
    .task-duration-input {
        font-size: 1.125rem;
    }
    
    .task {
        grid-template-columns: auto 1fr auto auto;
        gap: var(--space-sm);
    }
    
    .task .task-duration-input {
        width: 80px;
        min-width: 70px;
    }
    
    .task .task-name-input {
        grid-column: 2;
        grid-row: 1;
    }
    
    .task .task-duration-input {
        grid-column: 3;
        grid-row: 1;
    }
    
    .task .remove-task-btn {
        grid-column: 4;
        grid-row: 1;
    }
    
}

@media (max-width: 480px) {
    .app {
        padding: var(--space-sm);
    }
    
    .project-section,
    .timeline-section {
        margin: 0;
        padding: var(--space-md) 0;
    }
    
    .header h1 {
        font-size: 1.5rem;
    }
    
    .project-name-input {
        font-size: 1.125rem;
    }
    
    .stream-name-input,
    .task-name-input,
    .task-duration-input {
        font-size: 1.125rem;
    }
    
    .stream-header {
        flex-direction: row;
        gap: var(--space-sm);
        align-items: center;
        margin-bottom: var(--space-sm);
    }
    
    .tasks-container {
        margin-bottom: var(--space-sm);
    }
    
    
    .streams-footer {
        justify-content: center;
    }
    
    .task {
        grid-template-columns: 1fr auto auto;
        gap: var(--space-sm);
    }
    
    .task .task-name-input {
        grid-column: 1;
        grid-row: 1;
        min-width: 0;
    }
    
    .task .task-duration-input {
        grid-column: 2;
        grid-row: 1;
        width: 70px;
        flex-shrink: 0;
    }
    
    .task .remove-task-btn {
        grid-column: 3;
        grid-row: 1;
    }
    
    .drag-handle {
        display: none;
    }
    
    .timeline-task {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-xs);
    }
    
}