/* ===================================
   CSS CUSTOM PROPERTIES (THEMING)
   =================================== */
:root {
    /* Light Mode Colors (Notion-inspired) */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F7F6F3;
    --bg-card: #FFFFFF;
    --border-color: #E9E9E7;
    --text-primary: #37352F;
    --text-secondary: #787774;
    --accent-blue: #2383E2;
    --accent-blue-hover: #1a6bbf;
    --shadow: rgba(15, 15, 15, 0.05);
    --shadow-hover: rgba(15, 15, 15, 0.1);
    
    /* Category Colors */
    --category-arms: #FF6B6B;
    --category-back: #4ECDC4;
    --category-chest: #45B7D1;
    --category-legs: #FFA07A;
    --category-shoulders: #98D8C8;
    
    /* Spacing System */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 24px;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
}

/* Dark Mode Colors */
[data-theme="dark"] {
    --bg-primary: #191919;
    --bg-secondary: #252525;
    --bg-card: #2A2A2A;
    --border-color: #393939;
    --text-primary: #E8E7E5;
    --text-secondary: #9B9A97;
    --accent-blue: #529CCA;
    --accent-blue-hover: #6BB0D6;
    --shadow: rgba(0, 0, 0, 0.3);
    --shadow-hover: rgba(0, 0, 0, 0.5);
}

/* ===================================
   BASE RESET & TYPOGRAPHY
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* ===================================
   LAYOUT STRUCTURE
   =================================== */
.app-container {
    max-width: 100%;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.app-header {
    background-color: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 1px 3px var(--shadow);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 640px;
    margin: 0 auto;
}

.app-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
}

.app-subtitle {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
}

/* Dark Mode Toggle Button */
.theme-toggle {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    transition: all var(--transition-fast);
    font-family: var(--font-family);
}

.theme-toggle:hover {
    background: var(--border-color);
}

.theme-toggle:active {
    transform: scale(0.95);
}

/* Main Content */
.app-main {
    flex: 1;
    padding: var(--spacing-lg) var(--spacing-md);
    max-width: 640px;
    margin: 0 auto;
    width: 100%;
}

/* ===================================
   ROUTINE TABS NAVIGATION
   =================================== */
.routine-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none; /* Firefox */
}

.routine-tabs::-webkit-scrollbar {
    display: none; /* Chrome, Safari */
}

.routine-tab {
    flex: 1;
    min-width: 80px;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
    white-space: nowrap;
    font-family: var(--font-family);
}

.routine-tab:hover {
    background: var(--border-color);
}

.routine-tab.active {
    background: var(--accent-blue);
    color: white;
    border-color: var(--accent-blue);
}

.routine-tab:active {
    transform: scale(0.95);
}

/* ===================================
   WORKOUT CONTENT AREA
   =================================== */
.workout-content {
    min-height: 400px;
}

.routine-view {
    display: none;
}

.routine-view.active {
    display: block;
    animation: fadeIn var(--transition-base);
}

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

.routine-header {
    margin-bottom: var(--spacing-lg);
}

.routine-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.routine-description {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* ===================================
   EXERCISE CARD COMPONENT
   =================================== */
.exercises-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.exercise-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-base);
}

.exercise-card:hover {
    box-shadow: 0 4px 12px var(--shadow-hover);
}

.exercise-card.completed {
    opacity: 0.6;
}

.exercise-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
    gap: var(--spacing-sm);
}

.exercise-info {
    flex: 1;
}

.exercise-name {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.exercise-meta {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* ===================================
   CATEGORY BADGE COMPONENT
   =================================== */
.category-badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.category-badge.arms {
    background: var(--category-arms);
    color: white;
}

.category-badge.back {
    background: var(--category-back);
    color: white;
}

.category-badge.chest {
    background: var(--category-chest);
    color: white;
}

.category-badge.legs {
    background: var(--category-legs);
    color: white;
}

.category-badge.shoulders {
    background: var(--category-shoulders);
    color: white;
}

/* ===================================
   SETS LIST & CHECKBOX COMPONENT
   =================================== */
.sets-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.set-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    cursor: pointer;
    user-select: none;
}

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

.set-item.active {
    background: var(--accent-blue);
    color: white;
}

.set-item.active .set-text {
    color: white;
}

.set-item.completed .set-text {
    text-decoration: line-through;
    opacity: 0.6;
}

/* Custom Checkbox */
.set-checkbox {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all var(--transition-fast);
}

.set-item.active .set-checkbox {
    border-color: white;
}

.set-item.completed .set-checkbox {
    background: var(--accent-blue);
    border-color: var(--accent-blue);
}

.set-item.active.completed .set-checkbox {
    background: white;
    border-color: white;
}

.set-checkbox-icon {
    display: none;
    font-size: 12px;
}

.set-item.completed .set-checkbox-icon {
    display: block;
    color: white;
}

.set-item.active.completed .set-checkbox-icon {
    color: var(--accent-blue);
}

.set-text {
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    flex: 1;
}

/* ===================================
   WEIGHT INPUT COMPONENT
   =================================== */
.weight-input-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.weight-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    min-width: 60px;
}

.weight-input-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    flex: 1;
}

.weight-input {
    flex: 1;
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    font-family: var(--font-family);
    max-width: 80px;
}

.weight-input:focus {
    outline: none;
    border-color: var(--accent-blue);
}

.weight-unit-toggle {
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-size: var(--font-size-xs);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-family);
    min-width: 40px;
}

.weight-unit-toggle:hover {
    background: var(--border-color);
}

.weight-unit-toggle:active {
    transform: scale(0.95);
}

/* ===================================
   EXERCISE ACTIONS
   =================================== */
.exercise-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.btn {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-family);
}

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

.btn:active {
    transform: scale(0.95);
}

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

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

/* ===================================
   EMPTY STATE
   =================================== */
.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-secondary);
}

.empty-state-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.empty-state-text {
    font-size: var(--font-size-base);
}

/* ===================================
   WORKOUT SUMMARY & PROGRESS
   =================================== */
.workout-summary {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.summary-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

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

.summary-value {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--accent-blue);
    margin-bottom: var(--spacing-xs);
}

.summary-label {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-blue-hover));
    border-radius: 4px;
    transition: width var(--transition-base);
}

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

/* ===================================
   WORKOUT ACTIONS (BOTTOM)
   =================================== */
.workout-footer {
    position: sticky;
    bottom: 0;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-md);
    margin: var(--spacing-lg) calc(-1 * var(--spacing-md)) 0;
    box-shadow: 0 -2px 8px var(--shadow);
}

.workout-footer-content {
    max-width: 640px;
    margin: 0 auto;
    display: flex;
    gap: var(--spacing-sm);
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-base);
    font-weight: 600;
}

.btn-success {
    background: #10b981;
    color: white;
    border-color: #10b981;
}

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

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

/* ===================================
   CELEBRATION ANIMATION
   =================================== */
@keyframes celebrate {
    0%, 100% { transform: scale(1) rotate(0deg); }
    25% { transform: scale(1.1) rotate(-5deg); }
    75% { transform: scale(1.1) rotate(5deg); }
}

.celebrating {
    animation: celebrate 0.5s ease-in-out;
}

/* ===================================
   TIMER MODAL & OVERLAY
   =================================== */
.timer-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

.timer-overlay.active {
    display: flex;
    animation: fadeIn var(--transition-fast);
}

.timer-modal {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    max-width: 400px;
    width: 100%;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    text-align: center;
}

.timer-header {
    margin-bottom: var(--spacing-lg);
}

.timer-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.timer-subtitle {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* Timer Circle */
.timer-circle {
    position: relative;
    width: 200px;
    height: 200px;
    margin: 0 auto var(--spacing-lg);
}

.timer-display {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 48px;
    font-weight: 700;
    color: var(--accent-blue);
    font-variant-numeric: tabular-nums;
}

.timer-display.warning {
    color: #f59e0b;
}

.timer-display.danger {
    color: #ef4444;
    animation: pulse 0.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: translate(-50%, -50%) scale(1); }
    50% { transform: translate(-50%, -50%) scale(1.05); }
}

.timer-svg {
    transform: rotate(-90deg);
}

.timer-circle-bg {
    fill: none;
    stroke: var(--border-color);
    stroke-width: 8;
}

.timer-circle-progress {
    fill: none;
    stroke: var(--accent-blue);
    stroke-width: 8;
    stroke-linecap: round;
    transition: stroke-dashoffset 1s linear, stroke 0.3s ease;
}

.timer-circle-progress.warning {
    stroke: #f59e0b;
}

.timer-circle-progress.danger {
    stroke: #ef4444;
}

/* Timer Controls */
.timer-controls {
    display: flex;
    gap: var(--spacing-sm);
}

.timer-btn {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-family);
}

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

.timer-btn:active {
    transform: scale(0.95);
}

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

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

.timer-btn-danger {
    background: #ef4444;
    color: white;
    border-color: #ef4444;
}

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

/* Timer Quick Start in Exercise Card */
.rest-timer-btn {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-size: var(--font-size-xs);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-family);
    width: 100%;
}

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

/* ===================================
   EXERCISE LIBRARY MODAL
   =================================== */
.library-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    z-index: 1000;
    display: none;
    align-items: flex-end;
    justify-content: center;
}

.library-overlay.active {
    display: flex;
    animation: fadeIn var(--transition-fast);
}

.library-modal {
    background: var(--bg-card);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    width: 100%;
    max-width: 640px;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    animation: slideUp 0.3s ease-out;
}

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

.library-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    background: var(--bg-card);
    z-index: 10;
}

.library-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.library-filters {
    display: flex;
    gap: var(--spacing-sm);
    overflow-x: auto;
    scrollbar-width: none;
}

.library-filters::-webkit-scrollbar {
    display: none;
}

.filter-btn {
    padding: var(--spacing-xs) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    white-space: nowrap;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-family);
}

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

.filter-btn.active {
    background: var(--accent-blue);
    color: white;
    border-color: var(--accent-blue);
}

.library-search {
    margin-top: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    font-family: var(--font-family);
}

.library-search:focus {
    outline: none;
    border-color: var(--accent-blue);
}

.library-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
}

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

.library-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.library-item:hover {
    background: var(--border-color);
}

.library-item.selected {
    background: var(--accent-blue);
    border-color: var(--accent-blue);
    color: white;
}

.library-checkbox {
    width: 24px;
    height: 24px;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all var(--transition-fast);
}

.library-item.selected .library-checkbox {
    background: white;
    border-color: white;
}

.library-checkbox-icon {
    display: none;
    color: var(--accent-blue);
    font-size: 16px;
    font-weight: 700;
}

.library-item.selected .library-checkbox-icon {
    display: block;
}

.library-item-info {
    flex: 1;
}

.library-item-name {
    font-size: var(--font-size-base);
    font-weight: 500;
    margin-bottom: 2px;
}

.library-item-meta {
    font-size: var(--font-size-xs);
    opacity: 0.7;
}

.library-item.selected .library-item-meta {
    opacity: 1;
}

.library-footer {
    padding: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: var(--spacing-sm);
    background: var(--bg-card);
}

.library-footer .btn {
    flex: 1;
}

/* ===================================
   REST TIMER COMPONENT
   =================================== */
.timer-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
}

.timer-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.timer-modal {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    max-width: 320px;
    width: 90%;
    text-align: center;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    transform: scale(0.9);
    transition: transform var(--transition-base);
}

.timer-overlay.active .timer-modal {
    transform: scale(1);
}

.timer-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.timer-display {
    font-size: 72px;
    font-weight: 700;
    color: var(--accent-blue);
    margin: var(--spacing-lg) 0;
    font-variant-numeric: tabular-nums;
    line-height: 1;
}

.timer-display.warning {
    color: #f59e0b;
}

.timer-display.danger {
    color: #ef4444;
    animation: pulse 1s infinite;
}

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

.timer-progress-ring {
    width: 200px;
    height: 200px;
    margin: 0 auto var(--spacing-lg);
    position: relative;
}

.timer-progress-ring svg {
    transform: rotate(-90deg);
}

.timer-progress-ring circle {
    fill: none;
    stroke-width: 8;
}

.timer-progress-bg {
    stroke: var(--border-color);
}

.timer-progress-bar {
    stroke: var(--accent-blue);
    stroke-linecap: round;
    transition: stroke-dashoffset 0.3s linear;
}

.timer-progress-bar.warning {
    stroke: #f59e0b;
}

.timer-progress-bar.danger {
    stroke: #ef4444;
}

.timer-progress-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 48px;
    font-weight: 700;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
}

.timer-progress-text.warning {
    color: #f59e0b;
}

.timer-progress-text.danger {
    color: #ef4444;
}

.timer-controls {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

.timer-settings {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.timer-settings label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.timer-settings input {
    width: 60px;
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    font-family: var(--font-family);
    text-align: center;
}

.timer-settings input:focus {
    outline: none;
    border-color: var(--accent-blue);
}

/* ===================================
   UTILITY CLASSES
   =================================== */
.text-center {
    text-align: center;
}

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

/* ===================================
   RESPONSIVE ADJUSTMENTS
   =================================== */
@media (max-width: 375px) {
    .app-header {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .app-title {
        font-size: var(--font-size-base);
    }
    
    .theme-toggle {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: var(--font-size-xs);
    }
    
    .routine-tab {
        min-width: 70px;
        font-size: var(--font-size-xs);
    }
}

@media (max-width: 360px) {
    .app-main {
        padding: var(--spacing-md) var(--spacing-sm);
    }
    
    .exercise-card {
        padding: var(--spacing-md);
    }
    
    .summary-grid {
        gap: var(--spacing-sm);
    }
    
    .summary-value {
        font-size: var(--font-size-lg);
    }
    
    .timer-circle {
        width: 160px;
        height: 160px;
    }
    
    .timer-circle svg {
        width: 160px;
        height: 160px;
    }
    
    .timer-display {
        font-size: 36px;
    }
}

/* Landscape mobile optimization */
@media (max-height: 600px) and (orientation: landscape) {
    .workout-summary {
        margin-bottom: var(--spacing-md);
    }
    
    .timer-modal {
        padding: var(--spacing-md);
    }
    
    .timer-circle {
        width: 140px;
        height: 140px;
        margin-bottom: var(--spacing-md);
    }
}