/* CSS Variables for theming */
:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --secondary-color: #06b6d4;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --border-color: #e5e7eb;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius: 8px;
    --transition: all 0.3s ease;
}

/* Dark theme variables */
.dark-theme {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --bg-primary: #111827;
    --bg-secondary: #1f2937;
    --bg-tertiary: #374151;
    --border-color: #4b5563;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: var(--transition);
}

/* Header Styles */
header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 1rem 0;
    box-shadow: var(--shadow-lg);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

header h1 {
    font-size: 1.8rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.header-controls {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.header-controls button {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: var(--radius);
    background: rgba(255, 255, 255, 0.2);
    color: white;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.header-controls button:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

/* Main Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

/* Section Styles */
section {
    background: var(--bg-secondary);
    border-radius: var(--radius);
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

section h2 {
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

section h3 {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

/* Form Styles */
.task-form, .goal-form {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    align-items: center;
}

input[type="text"], input[type="number"], select {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
    flex: 1;
    min-width: 200px;
}

input[type="text"]:focus, input[type="number"]:focus, select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.add-btn {
    padding: 0.75rem 1.5rem;
    background: var(--success-color);
    color: white;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    white-space: nowrap;
}

.add-btn:hover {
    background: #059669;
    transform: translateY(-2px);
}

/* Task and Goal Lists */
.task-lists, .goals-lists {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.tasks-container, .goals-container {
    min-height: 200px;
    background: var(--bg-primary);
    border-radius: var(--radius);
    padding: 1rem;
    border: 1px solid var(--border-color);
}

/* Task and Goal Items */
.task-item, .goal-item {
    background: var(--bg-tertiary);
    border-radius: var(--radius);
    padding: 1rem;
    margin-bottom: 1rem;
    border-left: 4px solid var(--border-color);
    transition: var(--transition);
    position: relative;
}

.task-item:hover, .goal-item:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow);
}

.task-item.high-priority {
    border-left-color: var(--danger-color);
    background: rgba(239, 68, 68, 0.1);
}

.task-item.medium-priority {
    border-left-color: var(--warning-color);
    background: rgba(245, 158, 11, 0.1);
}

.task-item.low-priority {
    border-left-color: var(--success-color);
    background: rgba(16, 185, 129, 0.1);
}

.task-item.completed, .goal-item.completed {
    opacity: 0.7;
    background: rgba(16, 185, 129, 0.1);
    border-left-color: var(--success-color);
}

.task-content, .goal-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
}

.task-text, .goal-text {
    flex: 1;
    word-break: break-word;
}

.task-meta, .goal-meta {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.task-actions, .goal-actions {
    display: flex;
    gap: 0.5rem;
    flex-shrink: 0;
}

.action-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.25rem;
    border-radius: 4px;
    transition: var(--transition);
    color: var(--text-secondary);
}

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

.action-btn.complete {
    color: var(--success-color);
}

.action-btn.edit {
    color: var(--primary-color);
}

.action-btn.delete {
    color: var(--danger-color);
}

/* Timer Styles */
.timer-controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.countdown-timer, .focus-tracker {
    background: var(--bg-primary);
    padding: 1.5rem;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
}

.timer-display, .focus-display {
    font-size: 3rem;
    font-weight: 700;
    text-align: center;
    color: var(--primary-color);
    margin: 1rem 0;
    font-family: 'Courier New', monospace;
}

.timer-inputs {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.timer-inputs input {
    width: 80px;
    text-align: center;
    font-size: 1.2rem;
    font-weight: 600;
}

.timer-inputs span {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-secondary);
}

.timer-buttons, .focus-controls {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.timer-btn, .focus-btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.start-btn:hover {
    background: #059669;
}

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

.pause-btn:hover {
    background: #d97706;
}

.reset-timer-btn, .reset-focus-btn {
    background: var(--text-secondary);
    color: white;
}

.reset-timer-btn:hover, .reset-focus-btn:hover {
    background: var(--text-primary);
}

.timer-btn:disabled, .focus-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Notification */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 1rem 1.5rem;
    border-radius: var(--radius);
    color: white;
    font-weight: 600;
    z-index: 1000;
    transform: translateX(400px);
    transition: var(--transition);
    max-width: 300px;
}

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

.notification.success {
    background: var(--success-color);
}

.notification.error {
    background: var(--danger-color);
}

.notification.warning {
    background: var(--warning-color);
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }
    
    .header-controls {
        justify-content: center;
    }
    
    .task-lists, .goals-lists, .timer-controls {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .task-form, .goal-form {
        flex-direction: column;
        align-items: stretch;
    }
    
    input[type="text"], input[type="number"], select {
        min-width: auto;
    }
    
    .timer-display, .focus-display {
        font-size: 2rem;
    }
    
    .timer-inputs input {
        width: 60px;
        font-size: 1rem;
    }
    
    .timer-buttons, .focus-controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .container {
        padding: 1rem;
    }
    
    section {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.5rem;
    }
    
    .header-controls button {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }
    
    .timer-display, .focus-display {
        font-size: 1.5rem;
    }
    
    .timer-inputs input {
        width: 50px;
        font-size: 0.9rem;
    }
}

/* Animation for task completion */
@keyframes completeTask {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.task-item.completing, .goal-item.completing {
    animation: completeTask 0.5s ease;
}

/* Focus timer pulse animation */
@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.02); }
    100% { transform: scale(1); }
}

.focus-tracker.active .focus-display {
    animation: pulse 2s infinite;
}

/* Countdown timer warning animation */
@keyframes warning {
    0% { color: var(--primary-color); }
    50% { color: var(--danger-color); }
    100% { color: var(--primary-color); }
}

.countdown-timer.warning .timer-display {
    animation: warning 1s infinite;
}