/* ================================================
   RunSafe - CSS Variables & Base Styles
   ================================================ */

:root {
    /* Colors - Inspired by Strava/Nike Run Club */
    --primary-blue: #2563eb;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    
    --secondary-green: #10b981;
    --secondary-orange: #f59e0b;
    --secondary-red: #ef4444;
    --secondary-purple: #8b5cf6;
    
    /* Phase Colors */
    --phase1-color: #10b981; /* Green - Réadaptation */
    --phase2-color: #3b82f6; /* Blue - Base Aérobie */
    --phase3-color: #f59e0b; /* Orange - Volume */
    --phase4-color: #8b5cf6; /* Purple - Spécifique */
    --phase5-color: #ec4899; /* Pink - Consolidation */
    
    /* Neutrals */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #94a3b8;
    --border-color: #e2e8f0;
    --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);
    
    /* Spacing */
    --header-height: 60px;
    --bottom-nav-height: 64px;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

/* Dark Mode Variables */
body.dark-mode {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-tertiary: #64748b;
    --border-color: #334155;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.6);
}

/* ================================================
   Reset & Base Styles
   ================================================ */

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.5;
    overflow-x: hidden;
    padding-top: var(--header-height);
    padding-bottom: var(--bottom-nav-height);
}

/* ================================================
   Header
   ================================================ */

.app-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.header-content {
    max-width: 768px;
    margin: 0 auto;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-lg);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-blue);
}

.logo i {
    font-size: 1.5rem;
}

.header-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.btn-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    border: none;
    background-color: var(--bg-secondary);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

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

/* ================================================
   Main Content
   ================================================ */

.app-main {
    max-width: 768px;
    margin: 0 auto;
    min-height: calc(100vh - var(--header-height) - var(--bottom-nav-height));
}

.section {
    display: none;
    padding: var(--spacing-lg);
    animation: fadeIn 0.3s ease;
}

.section.active {
    display: block;
}

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

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

.section-header h1 {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

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

/* ================================================
   Cards
   ================================================ */

.card {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.card h3 i {
    color: var(--primary-blue);
}

/* ================================================
   Profile Card
   ================================================ */

.profile-card {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-dark) 100%);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    color: white;
}

.profile-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.avatar {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-full);
    background-color: rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.profile-details h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: white;
}

.profile-stats {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    font-size: 0.9rem;
    opacity: 0.95;
}

/* ================================================
   Progress Card
   ================================================ */

.progress-card {
    background: linear-gradient(135deg, var(--secondary-green) 0%, #059669 100%);
    color: white;
    border: none;
}

.progress-card h3 {
    color: white;
}

.progress-card h3 i {
    color: white;
}

.progress-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
}

.progress-stat {
    display: flex;
    flex-direction: column;
}

.progress-stat .label {
    font-size: 0.85rem;
    opacity: 0.9;
    margin-bottom: var(--spacing-xs);
}

.progress-stat .value {
    font-size: 1.5rem;
    font-weight: 700;
}

.phase-badge {
    background-color: rgba(255, 255, 255, 0.2);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-md);
    font-size: 0.9rem !important;
    font-weight: 600 !important;
}

.progress-bar {
    width: 100%;
    height: 12px;
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.progress-fill {
    height: 100%;
    background-color: white;
    border-radius: var(--radius-full);
    transition: width 0.5s ease;
}

.progress-label {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    opacity: 0.9;
}

/* ================================================
   Next Session Card
   ================================================ */

.next-session-card {
    border-left: 4px solid var(--phase1-color);
}

.session-details {
    margin-bottom: var(--spacing-lg);
}

.session-type {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.badge {
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 600;
}

.badge-phase1 { background-color: var(--phase1-color); color: white; }
.badge-phase2 { background-color: var(--phase2-color); color: white; }
.badge-phase3 { background-color: var(--phase3-color); color: white; }
.badge-phase4 { background-color: var(--phase4-color); color: white; }
.badge-phase5 { background-color: var(--phase5-color); color: white; }
.badge-exercise { background-color: var(--primary-blue); color: white; }

.session-name {
    font-size: 1.25rem;
    font-weight: 600;
}

.session-specs {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.spec {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-secondary);
}

.spec i {
    color: var(--primary-blue);
}

.session-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ================================================
   Stats Grid
   ================================================ */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.stat-card {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background-color: var(--bg-secondary);
    color: var(--primary-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.stat-content {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* ================================================
   Alerts
   ================================================ */

.alert {
    background-color: var(--bg-primary);
    border-left: 4px solid;
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    display: flex;
    gap: var(--spacing-md);
    box-shadow: var(--shadow-sm);
}

.alert i {
    font-size: 1.25rem;
    flex-shrink: 0;
}

.alert-warning {
    border-color: var(--secondary-orange);
    background-color: #fffbeb;
}

.dark-mode .alert-warning {
    background-color: rgba(245, 158, 11, 0.1);
}

.alert-warning i {
    color: var(--secondary-orange);
}

.alert-danger {
    border-color: var(--secondary-red);
    background-color: #fef2f2;
}

.dark-mode .alert-danger {
    background-color: rgba(239, 68, 68, 0.1);
}

.alert-danger i {
    color: var(--secondary-red);
}

.alert-info {
    border-color: var(--primary-blue);
    background-color: #eff6ff;
}

.dark-mode .alert-info {
    background-color: rgba(37, 99, 235, 0.1);
}

.alert-info i {
    color: var(--primary-blue);
}

.alert strong {
    display: block;
    margin-bottom: var(--spacing-xs);
}

.alert p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin: 0;
}

/* ================================================
   Phases Tabs
   ================================================ */

.phases-tabs {
    display: flex;
    overflow-x: auto;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    -webkit-overflow-scrolling: touch;
}

.phases-tabs::-webkit-scrollbar {
    height: 4px;
}

.phases-tabs::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: var(--radius-full);
}

.phase-tab {
    flex-shrink: 0;
    background-color: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    min-width: 100px;
}

.phase-tab:hover {
    border-color: var(--primary-blue);
}

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

.phase-number {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    background-color: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
}

.phase-tab.active .phase-number {
    background-color: rgba(255, 255, 255, 0.2);
}

.phase-name {
    font-size: 0.85rem;
    font-weight: 600;
    text-align: center;
}

/* ================================================
   Phase Content
   ================================================ */

.phase-info {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    border-left: 4px solid;
}

.phase-info.phase-1 { border-color: var(--phase1-color); }
.phase-info.phase-2 { border-color: var(--phase2-color); }
.phase-info.phase-3 { border-color: var(--phase3-color); }
.phase-info.phase-4 { border-color: var(--phase4-color); }
.phase-info.phase-5 { border-color: var(--phase5-color); }

.phase-info h2 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.phase-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.phase-meta span {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.phase-objective {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.phase-objective strong {
    display: block;
    margin-bottom: var(--spacing-xs);
    color: var(--primary-blue);
}

.weeks-grid {
    display: grid;
    gap: var(--spacing-md);
}

.week-card {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.week-card.completed {
    border-color: var(--secondary-green);
    background-color: rgba(16, 185, 129, 0.05);
}

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

.week-title {
    font-weight: 600;
    font-size: 1.1rem;
}

.week-status {
    width: 24px;
    height: 24px;
    border-radius: var(--radius-full);
    border: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--secondary-green);
}

.week-card.completed .week-status {
    background-color: var(--secondary-green);
    border-color: var(--secondary-green);
    color: white;
}

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

.session-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
}

.session-label {
    font-weight: 500;
}

.session-distance {
    color: var(--text-secondary);
}

/* ================================================
   Forms
   ================================================ */

.session-form {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-row {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.form-group label i {
    color: var(--primary-blue);
}

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

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

/* Feeling Slider */
.feeling-slider {
    margin-top: var(--spacing-sm);
}

.feeling-slider input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 8px;
    border-radius: var(--radius-full);
    background: linear-gradient(to right, var(--secondary-red), var(--secondary-orange), var(--secondary-green));
    outline: none;
    padding: 0;
    margin-bottom: var(--spacing-md);
}

.feeling-slider input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    border-radius: var(--radius-full);
    background: white;
    border: 3px solid var(--primary-blue);
    cursor: pointer;
    box-shadow: var(--shadow-md);
}

.feeling-slider input[type="range"]::-moz-range-thumb {
    width: 24px;
    height: 24px;
    border-radius: var(--radius-full);
    background: white;
    border: 3px solid var(--primary-blue);
    cursor: pointer;
    box-shadow: var(--shadow-md);
}

.feeling-labels {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

#feelingValue {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--primary-blue);
}

/* Checkbox */
.checkbox-label {
    display: flex !important;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

/* Pace Display */
.pace-display {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-dark) 100%);
    color: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    font-size: 1.1rem;
}

.pace-display strong {
    font-size: 1.5rem;
    font-weight: 700;
}

/* ================================================
   Buttons
   ================================================ */

.btn {
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-blue);
    border: 2px solid var(--primary-blue);
}

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

.btn-block {
    width: 100%;
}

.btn-sm {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.9rem;
}

/* ================================================
   Recent Sessions
   ================================================ */

.recent-sessions {
    margin-top: var(--spacing-xl);
}

.recent-sessions h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.session-history-card {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

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

.session-date {
    font-weight: 600;
    color: var(--text-primary);
}

.session-feeling {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.9rem;
}

.session-history-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

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

.history-stat-value {
    display: block;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-blue);
}

.history-stat-label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
}

.session-notes {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-style: italic;
}

.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.3;
}

/* ================================================
   Charts
   ================================================ */

.chart-controls {
    margin-bottom: var(--spacing-lg);
}

.chart-controls select {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
}

.chart-container {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.chart-container h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
}

/* ================================================
   Prevention / Exercises
   ================================================ */

.exercises-grid {
    display: grid;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.exercise-card {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    display: flex;
    gap: var(--spacing-lg);
}

.exercise-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-dark));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.exercise-content {
    flex: 1;
}

.exercise-content h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.exercise-specs {
    margin-bottom: var(--spacing-sm);
}

.exercise-content > p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.exercise-toggle {
    margin-top: var(--spacing-md);
}

.exercise-details {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.exercise-details ol,
.exercise-details ul {
    margin-left: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.exercise-details li {
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
    line-height: 1.6;
}

.exercise-details h4 {
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.tip {
    background-color: var(--bg-secondary);
    border-left: 3px solid var(--secondary-orange);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: var(--spacing-md);
}

.tip i {
    color: var(--secondary-orange);
    margin-right: var(--spacing-xs);
}

/* Equipment Card */
.equipment-card {
    margin-bottom: var(--spacing-lg);
}

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

.equipment-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.equipment-item i {
    color: var(--secondary-green);
    font-size: 1.25rem;
    flex-shrink: 0;
}

.equipment-item strong {
    display: block;
    margin-bottom: var(--spacing-xs);
}

.equipment-item p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin: 0;
}

/* Rules Card */
.rules-card {
    background: linear-gradient(135deg, var(--secondary-red) 0%, #dc2626 100%);
    color: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
}

.rules-card h3 {
    color: white;
    margin-bottom: var(--spacing-lg);
}

.rules-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.rules-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: 0.95rem;
    line-height: 1.6;
}

.rules-list i {
    font-size: 1.25rem;
    opacity: 0.9;
}

/* ================================================
   Bottom Navigation
   ================================================ */

.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--bottom-nav-height);
    background-color: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-around;
    align-items: center;
    z-index: 100;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
}

.nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
}

.nav-item i {
    font-size: 1.25rem;
}

.nav-item span {
    font-size: 0.7rem;
    font-weight: 500;
}

.nav-item.active {
    color: var(--primary-blue);
}

.nav-item.active::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 3px;
    background-color: var(--primary-blue);
    border-radius: 0 0 var(--radius-md) var(--radius-md);
}

/* Primary Nav Item (Add Button) */
.nav-item-primary {
    position: relative;
    margin-top: -20px;
}

.nav-item-primary i {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-dark) 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    box-shadow: var(--shadow-lg);
}

.nav-item-primary span {
    display: none;
}

.nav-item-primary.active::before {
    display: none;
}

/* ================================================
   Responsive
   ================================================ */

@media (max-width: 640px) {
    :root {
        font-size: 14px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .exercise-card {
        flex-direction: column;
        text-align: center;
    }
    
    .exercise-icon {
        margin: 0 auto;
    }
}

/* ================================================
   Utilities
   ================================================ */

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

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

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

/* Loading State */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-blue);
    border-radius: var(--radius-full);
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}