/* Workout Timer Pro - Main Stylesheet */

/* CSS Variables */
:root {
    --primary-color: #3b82f6;
    --primary-dark: #2563eb;
    --secondary-color: #10b981;
    --accent-color: #f59e0b;
    --danger-color: #ef4444;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-dark: #1f2937;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --radius: 8px;
    --transition: all 0.2s ease-in-out;
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Layout */
#app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Navigation */
.navbar {
    background: var(--bg-dark);
    color: white;
    padding: 1rem;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.nav-menu {
    display: flex;
    gap: 0.5rem;
}

.nav-btn {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.875rem;
}

.nav-btn:hover,
.nav-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 1rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

/* Views */
.view {
    display: none;
}

.view.active {
    display: block;
}

.view-header {
    margin-bottom: 2rem;
}

.view-header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.view-header p {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    gap: 0.5rem;
}

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

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

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

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

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

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

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

.btn-danger:hover {
    background: #dc2626;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1rem;
}

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

/* Workouts Grid */
.workouts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.workout-card {
    background: var(--bg-primary);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition);
    cursor: pointer;
}

.workout-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.workout-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.workout-card p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.workout-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Timer View */
.timer-container {
    background: var(--bg-primary);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow-lg);
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.workout-info h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.workout-info p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.timer-display {
    margin: 2rem 0;
}

.time-remaining {
    font-size: 4rem;
    font-weight: 700;
    color: var(--primary-color);
    font-family: 'Courier New', monospace;
    margin-bottom: 1rem;
}

.exercise-name {
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.progress-info {
    color: var(--text-secondary);
    font-size: 1rem;
}

.timer-controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin: 2rem 0;
    flex-wrap: wrap;
}

.workout-progress {
    margin-top: 2rem;
}

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

.progress-fill {
    height: 100%;
    background: var(--primary-color);
    transition: width 0.3s ease;
    width: 0%;
}

/* Import Form */
.import-form {
    background: var(--bg-primary);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    margin-bottom: 2rem;
}

.import-form textarea {
    width: 100%;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-family: inherit;
    font-size: 1rem;
    line-height: 1.6;
    resize: vertical;
    min-height: 200px;
}

.import-form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

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

.parsed-workout {
    background: var(--bg-primary);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.parsed-workout.hidden {
    display: none;
}

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

#workout-preview {
    background: var(--bg-secondary);
    padding: 1rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
    font-family: monospace;
    white-space: pre-wrap;
    max-height: 300px;
    overflow-y: auto;
}

/* Modals */
.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;
    padding: 1rem;
}

.modal-overlay.hidden {
    display: none;
}

.modal {
    background: var(--bg-primary);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
}

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

.modal-header h3 {
    margin: 0;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: var(--transition);
}

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

.modal-body {
    padding: 1.5rem;
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.text-center {
    text-align: center;
}

.mb-2 {
    margin-bottom: 0.5rem;
}

.mb-4 {
    margin-bottom: 1rem;
}

.mt-4 {
    margin-top: 1rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .navbar {
        padding: 0.75rem;
    }
    
    .nav-brand {
        font-size: 1.25rem;
        margin-bottom: 0.75rem;
    }
    
    .nav-menu {
        flex-wrap: wrap;
    }
    
    .main-content {
        padding: 0.75rem;
    }
    
    .timer-container {
        padding: 1.5rem;
        margin: 0 0.5rem;
    }
    
    .time-remaining {
        font-size: 3rem;
    }
    
    .timer-controls {
        flex-direction: column;
        align-items: center;
    }
    
    .btn-large {
        width: 100%;
        max-width: 200px;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .workouts-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .time-remaining {
        font-size: 2.5rem;
    }
    
    .exercise-name {
        font-size: 1.25rem;
    }
    
    .modal {
        margin: 0.5rem;
        max-height: calc(100vh - 1rem);
    }
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.slide-in {
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from { transform: translateX(-100%); }
    to { transform: translateX(0); }
}

/* Focus States for Accessibility */
.btn:focus,
.nav-btn:focus,
.modal-close:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .navbar,
    .timer-controls,
    .form-actions {
        display: none;
    }
    
    .timer-container {
        box-shadow: none;
        border: 1px solid #000;
    }
}

/* PWA Install Prompt */
.install-prompt {
    position: fixed;
    bottom: 20px;
    left: 20px;
    right: 20px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    animation: slideUp 0.3s ease-out;
}

.install-prompt-content {
    padding: 1rem;
    text-align: center;
}

.install-prompt-content p {
    margin: 0 0 1rem 0;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.install-prompt-content .btn {
    margin: 0 0.25rem;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

@keyframes slideUp {
    from {
        transform: translateY(100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* Hide install prompt on mobile when not needed */
@media (display-mode: standalone) {
    .install-prompt {
        display: none;
    }
}