/* CSS Variables */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --bg-tertiary: #e0e0e0;
    --text-primary: #212121;
    --text-secondary: #757575;
    --border-color: #e0e0e0;
    --primary-color: #FF9800;
    --primary-hover: #F57C00;
    --secondary-color: #757575;
    --secondary-hover: #616161;
    --danger-color: #f44336;
    --danger-hover: #d32f2f;
    --success-color: #4CAF50;
    --shadow: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-lg: 0 4px 12px rgba(0,0,0,0.15);
    --safe-area-top: env(safe-area-inset-top, 0px);
    --safe-area-bottom: env(safe-area-inset-bottom, 0px);
}

* {
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

body.dark-mode {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #404040;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --border-color: #404040;
    --shadow: 0 2px 4px rgba(0,0,0,0.3);
    --shadow-lg: 0 4px 12px rgba(0,0,0,0.4);
}

/* Reset & Base */
* {
    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;
    transition: background-color 0.3s, color 0.3s;
}

/* Header */
.app-header {
    background-color: #332200; /* Dark orange/brown for Dev */
    border-bottom: 2px solid var(--primary-color);
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.app-header::after {
    content: 'DEV MODE';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-color);
    color: black;
    font-size: 10px;
    font-weight: bold;
    padding: 2px 8px;
    border-radius: 0 0 4px 4px;
}

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

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

/* Container */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 1.5rem;
}

.screen-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

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

.btn-sm {
    padding: 0.4rem 0.8rem;
    font-size: 0.875rem;
}

.workout-container {
    max-width: 600px;
    margin: 0 auto;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    min-height: calc(100vh - 60px);
}

/* Screens */
.screen {
    display: none;
    animation: fadeIn 0.3s;
}

.screen.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.btn:active {
    transform: translateY(0);
}

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

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

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

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

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

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

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
    width: 100%;
}

.btn-link {
    background: none;
    color: var(--primary-color);
    padding: 0.5rem;
    text-decoration: none;
}

.icon-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: background-color 0.2s;
}

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

/* Plans List */
.plans-list {
    display: grid;
    gap: 1rem;
    margin: 1.5rem 0;
}

.plan-card {
    background-color: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: var(--shadow);
}

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

.plan-card h3 {
    margin-bottom: 0.5rem;
    font-size: 1.25rem;
}

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

.plan-card .exercise-count {
    margin-top: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Action Buttons */
.action-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 2rem;
}

/* Exercise Config List */
.exercise-config-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin: 1.5rem 0;
}

.exercise-config-item {
    background-color: var(--bg-secondary);
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.exercise-config-item h4 {
    margin-bottom: 0.75rem;
}

.config-inputs {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 0.75rem;
}

.config-input-group {
    display: flex;
    flex-direction: column;
}

.config-input-group label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.config-input-group input {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.875rem;
}

/* Workout Screen */
.workout-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.workout-progress {
    font-size: 1.125rem;
    font-weight: 600;
}

.workout-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    text-align: center;
}

.workout-main h2 {
    font-size: 1.75rem;
    margin-bottom: 1rem;
}

.exercise-instructions {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 0.875rem;
    max-height: 100px;
    overflow-y: auto;
}

.set-info {
    margin-bottom: 2rem;
}

.set-number {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.set-target {
    font-size: 1.5rem;
    color: var(--primary-color);
    font-weight: 700;
}

.timer-display {
    background-color: var(--bg-secondary);
    padding: 2rem;
    border-radius: 16px;
    margin-bottom: 2rem;
}

.timer-label {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.timer-value {
    font-size: 3rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

.timer-display.active {
    background-color: var(--primary-color);
    color: white;
}

.timer-display.active .timer-label {
    color: rgba(255,255,255,0.8);
}

.workout-controls {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.workout-controls .btn {
    flex: 1;
}

/* Summary Screen */
.summary-stats {
    background-color: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 12px;
    margin: 1.5rem 0;
}

.summary-stats .stat-item {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.summary-stats .stat-item:last-child {
    border-bottom: none;
}

.stat-label {
    color: var(--text-secondary);
}

.stat-value {
    font-weight: 600;
}

.cool-down-section {
    margin: 2rem 0;
}

.cool-down-section h3 {
    margin-bottom: 1rem;
}

.cool-down-section ul {
    list-style: none;
    padding: 0;
}

.cool-down-section li {
    padding: 0.75rem;
    background-color: var(--bg-secondary);
    margin-bottom: 0.5rem;
    border-radius: 8px;
}

/* Manage Lists */
.manage-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

.manage-item {
    background-color: var(--bg-secondary);
    padding: 1rem;
    border-radius: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: background-color 0.2s;
}

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

.unused-item {
    border-left: 4px solid #ff9800;
}

.badge {
    display: inline-block;
    padding: 0.25em 0.4em;
    font-size: 75%;
    font-weight: 700;
    line-height: 1;
    text-align: center;
    white-space: nowrap;
    vertical-align: baseline;
    border-radius: 0.25rem;
    margin-left: 0.5rem;
}

.badge-warning {
    background-color: #ff9800;
    color: #fff;
}

.manage-item-info h4 {
    margin-bottom: 0.25rem;
}

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

.manage-item-actions {
    display: flex;
    gap: 0.5rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
}

.form-group textarea {
    resize: vertical;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.form-actions .btn {
    flex: 1;
}

/* Plan Exercises List */
.plans-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

.history-item {
    background-color: var(--bg-secondary);
    padding: 1rem;
    border-radius: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.history-item-info h4 {
    margin-bottom: 0.25rem;
}

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

.tags-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.tag-chip {
    padding: 0.25rem 0.75rem;
    background-color: var(--bg-tertiary);
    border-radius: 20px;
    font-size: 0.75rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

.tag-chip.active {
    background-color: var(--primary-color);
    color: white;
}

.workout-progress-bar {
    width: 100%;
    height: 6px;
    background-color: var(--bg-tertiary);
    border-radius: 3px;
    margin-bottom: 1rem;
    overflow: hidden;
}

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

.weight-input-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.weight-input-container input {
    width: 80px;
    padding: 0.4rem;
    text-align: center;
}

.rest-adjust-controls {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
}

.next-exercise-preview {
    background-color: var(--bg-tertiary);
    padding: 0.75rem;
    border-radius: 8px;
    margin: 1rem 0;
    text-align: center;
}

.next-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    display: block;
    margin-bottom: 0.25rem;
}

.empty-msg {
    text-align: center;
    color: var(--text-secondary);
    margin-top: 2rem;
}

.pre-workout-note {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-style: italic;
    margin-bottom: 1.5rem;
    text-align: center;
}

.next-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    display: block;
    margin-bottom: 0.25rem;
}

.empty-msg {
    text-align: center;
    color: var(--text-secondary);
    margin-top: 2rem;
}

.plan-exercise-item {
    background-color: var(--bg-secondary);
    padding: 1rem;
    border-radius: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: move;
    transition: opacity 0.2s, transform 0.2s;
}

.plan-exercise-item.dragging {
    opacity: 0.5;
    transform: scale(0.98);
}

.drag-handle {
    margin-right: 1rem;
    color: var(--text-secondary);
    font-size: 1.2rem;
    cursor: move;
    user-select: none;
}

.plan-exercise-info {
    flex: 1;
}

.plan-exercise-info h5 {
    margin-bottom: 0.25rem;
}

.plan-exercise-info p {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.plan-exercise-actions {
    display: flex;
    gap: 0.5rem;
}

.plan-exercise-actions button {
    padding: 0.25rem 0.5rem;
    font-size: 0.875rem;
}

/* Settings */
.settings-section {
    margin-bottom: 2rem;
}

.settings-section h3 {
    margin-bottom: 1rem;
}

.settings-section .btn {
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: auto;
    cursor: pointer;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    z-index: 1000;
    animation: fadeIn 0.2s;
}

.modal.active {
    display: flex;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background-color: var(--bg-primary);
    border-radius: 12px;
    width: 90%;
    max-width: 500px;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
}

.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;
}

.modal-close {
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: var(--text-secondary);
    line-height: 1;
}

.modal-body {
    padding: 1.5rem;
    overflow-y: auto;
}

.search-input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.exercise-select-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.exercise-select-item {
    padding: 1rem;
    background-color: var(--bg-secondary);
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.2s;
}

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

.exercise-select-item h5 {
    margin-bottom: 0.25rem;
}

.exercise-select-item p {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 600px) {
    .app-header h1 {
        font-size: 1.25rem;
    }
    
    .container,
    .workout-container {
        padding: 1rem;
    }
    
    .workout-main h2 {
        font-size: 1.5rem;
    }
    
    .timer-value {
        font-size: 2.5rem;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .workout-controls {
        flex-direction: column;
    }
    
    .form-actions {
        flex-direction: column;
    }
}

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

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

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }

/* Mobile Optimizations */
@media (max-width: 600px) {
    .container {
        padding: 1rem;
    }
    
    .form-row {
        flex-direction: column;
        gap: 0;
    }
    
    .workout-container {
        padding: 1rem;
        padding-bottom: calc(1rem + var(--safe-area-bottom));
    }
    
    .timer-value {
        font-size: 4rem;
    }
    
    .manage-item {
        padding: 1.25rem;
    }
    
    .plan-card {
        padding: 1.5rem;
    }

    .btn-large {
        min-height: 60px;
        font-size: 1.2rem;
    }

    /* Better touch targets */
    .btn, .icon-btn, .manage-item, .plan-card, .tag-chip {
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .manage-item-info {
        flex: 1;
        text-align: left;
    }
}

/* Mobile Optimizations */
@media (max-width: 600px) {
    .container {
        padding: 1rem;
    }
    
    .app-header {
        padding: calc(0.75rem + var(--safe-area-top)) 1rem 0.75rem;
    }

    .btn {
        min-height: 48px; /* Better touch target */
    }

    input[type="number"], 
    input[type="text"], 
    select, 
    textarea {
        font-size: 16px !important; /* Prevents iOS zoom on focus */
        padding: 0.75rem;
    }

    .workout-controls {
        gap: 0.5rem;
    }

    .set-target {
        font-size: 1.5rem;
    }

    .timer-value {
        font-size: 3.5rem;
    }
}

/* Better visual feedback for touch */
.btn:active, .plan-card:active, .manage-item:active {
    opacity: 0.7;
    transform: scale(0.98);
}

/* Centering Plan Cards */
.plan-card {
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100px;
}

.plan-card h3 {
    margin-bottom: 0.25rem;
}