:root {
    /* Geist Dark Mode Colors */
    --bg-primary: #000000;
    --bg-secondary: #111111;
    --bg-tertiary: #1a1a1a;
    --bg-card: #0a0a0a;
    --bg-card-hover: #111111;
    
    --text-primary: #fafafa;
    --text-secondary: #a1a1a1;
    --text-muted: #666666;
    
    --accent-primary: #0070f3;
    --accent-secondary: #0060df;
    --accent-success: #00d924;
    --accent-warning: #f5a623;
    --accent-error: #e00;
    
    --border-primary: #333333;
    --border-secondary: #262626;
    --border-subtle: #1a1a1a;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.8);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.6);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.4);
    
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
}

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

body {
    font-family: 'Geist', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    font-weight: 400;
    font-size: 14px;
    overflow-x: hidden;
}

.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
}

.header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    opacity: 0;
    animation: fadeInUp 0.8s ease-out forwards;
}

.app-title {
    font-size: 32px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.app-subtitle {
    font-size: 14px;
    color: var(--text-muted);
    font-weight: 400;
    letter-spacing: 0;
    line-height: 1.4;
}

.app-subtitle a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color 0.15s ease;
}

.app-subtitle a:hover {
    color: var(--accent-secondary);
    text-decoration: underline;
}

.intro-section {
    margin-bottom: var(--spacing-2xl);
}

.method-explanation {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.method-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    opacity: 0;
}

.method-item:hover {
    background: var(--bg-card-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.method-number {
    width: 24px;
    height: 24px;
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 500;
    flex-shrink: 0;
    margin-right: var(--spacing-md);
    border: 1px solid var(--border-secondary);
}

.method-text h3 {
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 0;
    color: var(--text-primary);
    letter-spacing: 0;
    line-height: 1.4;
}

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

.planner-section {
    margin-bottom: var(--spacing-2xl);
}

.planner-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.tasks-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.task-block {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    transition: all 0.2s ease;
    opacity: 0;
}

.task-block:hover {
    background: var(--bg-card-hover);
    box-shadow: var(--shadow-md);
}

.task-block.primary-task {
    grid-column: 1 / -1;
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.05) 0%, rgba(8, 145, 178, 0.05) 100%);
    border-color: rgba(6, 182, 212, 0.2);
}

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

.block-title {
    display: flex;
    align-items: center;
}

.block-icon {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
    margin-right: var(--spacing-sm);
    color: var(--text-muted);
}

.block-header h2 {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-primary);
    letter-spacing: -0.01em;
    line-height: 1.3;
}

.primary-task-content {
    display: grid;
    grid-template-columns: 1fr 3fr;
    gap: var(--spacing-lg);
    align-items: start;
}

.timer-column {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-secondary);
}

.timer-display-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    align-items: center;
    text-align: center;
}

.timer-display {
    font-family: 'Geist', monospace;
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: 1px;
}

.timer-status {
    font-size: 12px;
    color: var(--text-muted);
    font-weight: 400;
}

.completion-counter {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 500;
}

.task-input-column {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

#primary-task {
    width: 100%;
    min-height: 120px;
    background: var(--bg-primary);
    border: 1px solid var(--border-secondary);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    font-family: 'Geist', inherit;
    font-size: 14px;
    color: var(--text-primary);
    resize: vertical;
    transition: all 0.2s ease;
    line-height: 1.5;
}

#primary-task:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.1);
}

#primary-task::placeholder {
    color: var(--text-muted);
}

.progress-bar {
    width: 100%;
    height: 6px;
    background: var(--bg-secondary);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
    position: relative;
    border: 1px solid var(--border-subtle);
}

.progress-fill {
    height: 100%;
    background: var(--accent-primary);
    width: 0%;
    transition: width 0.5s ease;
    border-radius: 3px;
}

.progress-time {
    font-size: 11px;
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
    text-align: center;
}

.timer-controls {
    display: flex;
    gap: var(--spacing-xs);
    justify-content: center;
    align-items: center;
}

.timer-btn {
    background: transparent;
    border: 1px solid var(--border-secondary);
    padding: 0;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s ease;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.timer-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--border-primary);
}

.timer-btn:active {
    scale: 0.95;
}

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

.timer-btn.primary:hover {
    background: var(--accent-secondary);
    border-color: var(--accent-secondary);
    color: white;
}

.task-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.task-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    position: relative;
}

.task-checkbox {
    appearance: none;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-subtle);
    border-radius: 4px;
    background: var(--bg-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.task-checkbox:checked {
    background: var(--accent-gradient);
    border-color: var(--accent-primary);
}

.task-checkbox:checked::after {
    content: '✓';
    display: block;
    color: white;
    font-size: 12px;
    text-align: center;
    line-height: 16px;
}

.task-input {
    flex: 1;
    background: var(--bg-primary);
    border: 1px solid var(--border-secondary);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: 'Geist', inherit;
    font-size: 13px;
    color: var(--text-primary);
    line-height: 1.4;
    transition: all 0.2s ease;
}

.task-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(0, 112, 243, 0.1);
}

.task-input::placeholder {
    color: var(--text-muted);
}

.task-input.completed {
    text-decoration: line-through;
    color: var(--text-muted);
    background: var(--bg-tertiary);
}

.checkbox-label {
    position: absolute;
    left: 0;
    top: 0;
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.action-buttons {
    display: flex;
    justify-content: center;
    opacity: 0;
}

.reset-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-weight: 400;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.15s ease;
    border: 1px solid;
    font-family: 'Geist', inherit;
    line-height: 1.4;
    background: transparent;
    border-color: var(--border-secondary);
    color: var(--text-secondary);
}

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

.quote-section {
    margin-bottom: var(--spacing-2xl);
    opacity: 0;
}

blockquote {
    text-align: center;
    font-style: italic;
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.7;
}

cite {
    display: block;
    margin-top: var(--spacing-md);
    font-size: 0.9rem;
    color: var(--text-muted);
    font-style: normal;
}

.footer {
    text-align: center;
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--border-muted);
    color: var(--text-muted);
    font-size: 0.9rem;
    opacity: 0;
}

.footer p {
    margin-bottom: var(--spacing-xs);
}

.footer a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color 0.15s ease;
}

.footer a:hover {
    color: var(--accent-secondary);
    text-decoration: underline;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.8s ease-out forwards;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

.timer-active {
    animation: pulse 2s ease-in-out infinite;
}

@media (max-width: 768px) {
    .app-container {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .method-explanation {
        grid-template-columns: 1fr;
    }
    
    .planner-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .tasks-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .task-block {
        padding: var(--spacing-lg);
    }
    
    .block-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
    
    .reset-btn {
        width: 100%;
        max-width: 200px;
    }
    
    .primary-task-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .timer-column {
        order: 2;
    }
    
    .task-input-column {
        order: 1;
    }
}

@media (max-width: 480px) {
    .app-container {
        padding: var(--spacing-md) var(--spacing-sm);
    }
    
    .method-item {
        flex-direction: column;
        text-align: center;
    }
    
    .task-item {
        flex-direction: column;
        align-items: stretch;
        gap: var(--spacing-xs);
    }
    
    .task-checkbox {
        align-self: flex-start;
    }
}

.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text-primary);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-lg);
    transform: translateX(100%);
    transition: transform 0.3s ease;
    z-index: 1000;
}

.notification.show {
    transform: translateX(0);
}

.notification.success {
    border-color: #22c55e;
}

.notification.info {
    border-color: var(--accent-primary);
}