/* ===== HOURMINT - FUTURISTIC TIME MANAGEMENT HUB ===== */
/* CSS Variables for easy customization */
:root {
    /* Primary Colors - Futuristic Blue Theme */
    --primary-color: #00d4ff;
    --primary-dark: #0099cc;
    --primary-light: #66e6ff;
    --secondary-color: #7b2cbf;
    --accent-color: #ff6b35;
    
    /* Background Colors */
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #2a2a2a;
    --bg-glass: rgba(255, 255, 255, 0.05);
    --bg-glass-hover: rgba(255, 255, 255, 0.1);
    
    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --text-muted: #808080;
    --text-inverse: #000000;
    
    /* Status Colors */
    --success-color: #00ff88;
    --warning-color: #ffaa00;
    --error-color: #ff4444;
    --info-color: #00d4ff;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    --gradient-secondary: linear-gradient(135deg, var(--accent-color) 0%, var(--primary-color) 100%);
    --gradient-dark: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 212, 255, 0.1);
    --shadow-md: 0 8px 32px rgba(0, 212, 255, 0.15);
    --shadow-lg: 0 16px 64px rgba(0, 212, 255, 0.2);
    --shadow-glow: 0 0 20px rgba(0, 212, 255, 0.3);
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-md: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 3rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

.fas {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 1em;
    font-style: normal;
    line-height: 1;
}

.fa-sun::before { content: '☀'; }
.fa-moon::before { content: '☾'; }
.fa-list::before { content: '☷'; }
.fa-history::before { content: '↺'; }
.fa-cog::before { content: '⚙'; }
.fa-upload::before { content: '↑'; }
.fa-download::before { content: '↓'; }
.fa-plus::before { content: '+'; }
.fa-stop::before { content: '■'; }
.fa-arrow-left::before { content: '←'; }
.fa-calendar::before { content: '▣'; }
.fa-refresh::before { content: '↻'; }
.fa-trash::before { content: '⌫'; }
.fa-times::before { content: '×'; }
.fa-edit::before { content: '✎'; }

.app-footer {
    display: flex;
    justify-content: center;
    gap: 1rem;
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.app-footer a {
    color: inherit;
    text-underline-offset: 0.2em;
}

/* ===== LIGHT THEME VARIABLES ===== */
[data-theme="light"] {
    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --bg-glass: rgba(0, 0, 0, 0.05);
    --bg-glass-hover: rgba(0, 0, 0, 0.1);
    
    /* Text Colors */
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-muted: #adb5bd;
    --text-inverse: #ffffff;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 16px 64px rgba(0, 0, 0, 0.2);
    --shadow-glow: 0 0 20px rgba(0, 212, 255, 0.2);
}

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

*::before,
*::after {
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    position: relative;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* ===== LOADING SCREEN ===== */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
}

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

.loading-logo {
    margin-bottom: var(--spacing-xl);
}

.logo-circle {
    width: 80px;
    height: 80px;
    border: 3px solid var(--primary-color);
    border-radius: 50%;
    margin: 0 auto var(--spacing-md);
    position: relative;
    animation: pulse 2s infinite;
}

.logo-circle::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60%;
    height: 60%;
    background: var(--gradient-primary);
    border-radius: 50%;
    animation: rotate 3s linear infinite;
}

.logo-text {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.loading-bar {
    width: 200px;
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: 2px;
    overflow: hidden;
    margin: 0 auto;
}

.loading-progress {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 2px;
    animation: loading 2s ease-in-out infinite;
}

/* ===== APP CONTAINER ===== */
.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    min-height: 100vh;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.app-container.loaded {
    opacity: 1;
    transform: translateY(0);
}

/* ===== HEADER ===== */
.header {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

[data-theme="light"] .header {
    border: 1px solid rgba(0, 0, 0, 0.1);
}

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

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

.logo-icon {
    position: relative;
}

.logo-icon .logo-circle {
    width: 40px;
    height: 40px;
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

.logo-icon .logo-circle::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60%;
    height: 60%;
    background: var(--gradient-primary);
    border-radius: 50%;
    animation: rotate 3s linear infinite;
}

.app-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0;
}

.app-subtitle {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: 500;
}

.today-date {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}

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

.control-btn {
    background: var(--bg-glass);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-sm);
}

[data-theme="light"] .control-btn {
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.control-btn:hover {
    background: var(--bg-glass-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.control-btn i {
    font-size: var(--font-size-md);
}

/* ===== TIMER SECTION ===== */
.timer-section {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    text-align: center;
    position: relative;
    overflow: hidden;
    transition: all var(--transition-normal);
}

[data-theme="light"] .timer-section {
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.timer-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.timer-section.active::before {
    opacity: 1;
}

.timer-container {
    position: relative;
    z-index: 1;
}

.activity-status {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
}

.activity-name {
    font-weight: 600;
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 100%;
    display: block;
    font-size: var(--font-size-md);
    transition: font-size 0.2s;
}

.timer-display {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    font-family: 'Courier New', monospace;
    color: var(--primary-color);
    margin-bottom: var(--spacing-lg);
    text-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
}

.work-time-indicator {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin-bottom: var(--spacing-md);
}

.timer-controls {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
}

/* ===== BUTTONS ===== */
.btn {
    background: var(--bg-glass);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
    font-weight: 500;
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

[data-theme="light"] .btn {
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left var(--transition-normal);
}

.btn:hover::before {
    left: 100%;
}

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

.btn-primary {
    background: var(--gradient-primary);
    border: none;
    color: var(--text-inverse);
}

.btn-primary:hover {
    box-shadow: var(--shadow-glow);
}

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

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

.btn-stop {
    background: var(--error-color);
    border: none;
    color: var(--text-inverse);
}

.btn-stop:hover:not(:disabled) {
    background: #ff3333;
    box-shadow: 0 0 20px rgba(255, 68, 68, 0.3);
}

.btn-stop:disabled {
    background: var(--text-muted);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-add {
    background: var(--success-color);
    border: none;
    color: var(--text-inverse);
}

.btn-add:hover {
    background: #00cc6a;
    box-shadow: 0 0 20px rgba(0, 255, 136, 0.3);
}

.btn-icon {
    font-size: var(--font-size-md);
}

/* ===== SECTION HEADERS ===== */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

[data-theme="light"] .section-header {
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.section-header h2 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

/* ===== QUICK ACTIONS ===== */
.quick-actions {
    margin-bottom: var(--spacing-xl);
}

.activity-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.activity-container {
    position: relative;
}

.activity-btn {
    width: 100%;
    height: 80px;
    border: none;
    background: var(--bg-glass);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    text-align: center;
    padding: var(--spacing-sm);
}

[data-theme="light"] .activity-btn {
    background: var(--bg-glass);
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.activity-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--activity-color, var(--primary-color)) 0%, transparent 100%);
    opacity: 0.1;
    transition: opacity var(--transition-fast);
    z-index: 1;
}

.activity-btn:hover::before {
    opacity: 0.2;
}

.activity-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--activity-color, var(--primary-color));
}

.activity-btn.active {
    background: var(--activity-color, var(--primary-color));
    color: var(--text-inverse);
    box-shadow: var(--shadow-glow);
    animation: pulse 2s infinite;
}

.activity-btn.active::before {
    opacity: 0.3;
}

.activity-edit-btn {
    position: absolute;
    top: var(--spacing-xs);
    right: var(--spacing-xs);
    width: 24px;
    height: 24px;
    border: none;
    background: var(--bg-tertiary);
    color: var(--text-muted);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xs);
    opacity: 0;
    transition: all var(--transition-fast);
    z-index: 2;
}

[data-theme="light"] .activity-edit-btn {
    background: var(--bg-secondary);
}

.activity-container:hover .activity-edit-btn {
    opacity: 1;
}

.activity-edit-btn:hover {
    background: var(--primary-color);
    color: var(--text-inverse);
    transform: scale(1.1);
}

.activity-stop-btn {
    position: absolute;
    top: var(--spacing-xs);
    left: var(--spacing-xs);
    width: 24px;
    height: 24px;
    border: none;
    background: var(--error-color);
    color: var(--text-inverse);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xs);
    transition: all var(--transition-fast);
    z-index: 2;
    animation: pulse 2s infinite;
}

.activity-stop-btn:hover {
    background: #ff6666;
    transform: scale(1.1);
}

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

.activity-indicator {
    font-size: var(--font-size-lg);
}

/* ===== PROGRESS DASHBOARD ===== */
.progress-dashboard {
    margin-bottom: var(--spacing-xl);
}

.progress-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.progress-card {
    background: var(--bg-glass);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    text-align: center;
    transition: all var(--transition-fast);
}

[data-theme="light"] .progress-card {
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.progress-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.card-icon {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-sm);
}

.work-card .card-icon {
    color: var(--primary-color);
}

.break-card .card-icon {
    color: var(--accent-color);
}

.target-card .card-icon {
    color: var(--secondary-color);
}

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

.card-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

.card-value {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
    font-family: 'Courier New', monospace;
}

.progress-bar-container {
    margin-top: var(--spacing-lg);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 4px;
    transition: width var(--transition-normal);
    position: relative;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: shimmer 2s infinite;
}

.progress-label {
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: 500;
}

/* ===== ANALYTICS SECTION ===== */
.analytics-section {
    margin-bottom: var(--spacing-xl);
}

.chart-container {
    background: var(--bg-glass);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    height: 400px;
    position: relative;
}

[data-theme="light"] .chart-container {
    border: 1px solid rgba(0, 0, 0, 0.1);
}

/* ===== HISTORY SECTION ===== */
.history-section {
    margin-bottom: var(--spacing-xl);
}

.history-controls {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    align-items: center;
    flex-wrap: wrap;
}

.date-picker {
    background: var(--bg-glass);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
}

[data-theme="light"] .date-picker {
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.date-picker:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(0, 212, 255, 0.2);
}

.history-chart-container {
    background: var(--bg-glass);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    height: 400px;
}

[data-theme="light"] .history-chart-container {
    border: 1px solid rgba(0, 0, 0, 0.1);
}

/* ===== MODALS ===== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.modal.show {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--bg-secondary);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: 0;
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    transform: scale(0.9);
    transition: transform var(--transition-normal);
}

[data-theme="light"] .modal-content {
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.modal.show .modal-content {
    transform: scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

[data-theme="light"] .modal-header {
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.modal-header h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.close-btn {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: 40px;
    height: 40px;
    border: none;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    font-size: var(--font-size-lg);
    z-index: 10;
}

.close-btn:hover {
    background: var(--error-color);
    color: var(--text-inverse);
    transform: scale(1.1);
}

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

.close-btn i {
    pointer-events: none;
}

.modal-body {
    padding: var(--spacing-lg);
}

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

.setting-group label,
.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--text-primary);
}

.setting-group input,
.setting-group select,
.form-group input,
.form-group select {
    width: 100%;
    background: var(--bg-glass);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
}

[data-theme="light"] .setting-group input,
[data-theme="light"] .setting-group select,
[data-theme="light"] .form-group input,
[data-theme="light"] .form-group select {
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.setting-group input:focus,
.setting-group select:focus,
.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(0, 212, 255, 0.2);
}

.help-text {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}

.checkbox-group {
    margin-top: var(--spacing-md);
}

.checkbox-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-size: var(--font-size-md);
    color: var(--text-primary);
    transition: color var(--transition-fast);
    user-select: none;
    position: relative;
    padding-left: 35px;
    min-height: 24px;
}

.checkbox-label:hover {
    color: var(--primary-color);
}

.checkbox-label input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
    left: 0;
    top: 0;
}

.checkmark {
    position: absolute;
    left: 0;
    top: 0;
    height: 24px;
    width: 24px;
    background: var(--bg-tertiary);
    border: 2px solid var(--text-muted);
    border-radius: 6px;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

[data-theme="light"] .checkmark {
    background: var(--bg-secondary);
    border-color: var(--text-muted);
}

.checkbox-label input[type="checkbox"]:checked + .checkmark {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.checkbox-label input[type="checkbox"]:checked + .checkmark::after {
    content: '✓';
    color: var(--text-inverse);
    font-size: 16px;
    font-weight: bold;
    line-height: 1;
}

.checkbox-label input[type="checkbox"]:focus + .checkmark {
    box-shadow: 0 0 0 2px var(--primary-color);
    outline: none;
}

.checkbox-label input[type="checkbox"]:hover + .checkmark {
    border-color: var(--primary-color);
}

/* Color picker styling */
.setting-group input[type="color"] {
    width: 60px;
    height: 40px;
    border: 2px solid var(--text-muted);
    border-radius: var(--radius-sm);
    background: var(--bg-tertiary);
    cursor: pointer;
    padding: 0;
    transition: all var(--transition-fast);
}

[data-theme="light"] .setting-group input[type="color"] {
    background: var(--bg-secondary);
    border-color: var(--text-muted);
}

.setting-group input[type="color"]:hover {
    border-color: var(--primary-color);
    transform: scale(1.05);
}

.setting-group input[type="color"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.3);
}

/* Mobile-specific checkbox improvements */
@media (max-width: 768px) {
    .checkbox-label {
        padding-left: 40px;
        min-height: 28px;
    }
    
    .checkmark {
        height: 28px;
        width: 28px;
        border-radius: 8px;
    }
    
    .checkbox-label input[type="checkbox"]:checked + .checkmark::after {
        font-size: 18px;
    }
    
    .setting-group input[type="color"] {
        width: 70px;
        height: 50px;
    }
}

.modal-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
    margin-top: var(--spacing-xl);
}

.modal-actions .btn {
    min-width: 100px;
}

/* ===== ACTIVITY LOGS ===== */
.logs-container {
    max-height: 400px;
    overflow-y: auto;
}

.log-entry {
    display: grid;
    grid-template-columns: auto 1fr auto auto auto;
    gap: var(--spacing-md);
    align-items: center;
    padding: var(--spacing-md);
    background: var(--bg-glass);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
    transition: all var(--transition-fast);
    position: relative;
}

[data-theme="light"] .log-entry {
    background: var(--bg-glass);
}

.log-entry:hover {
    background: var(--bg-glass-hover);
    transform: translateX(4px);
}

.log-time {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    white-space: nowrap;
}

.log-activity {
    font-weight: 600;
    color: var(--text-primary);
}

.log-action {
    font-size: var(--font-size-sm);
    color: var(--primary-color);
    text-transform: capitalize;
}

.log-details {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-style: italic;
}

.log-delete-btn {
    width: 32px;
    height: 32px;
    border: none;
    background: var(--bg-tertiary);
    color: var(--text-muted);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    font-size: var(--font-size-sm);
    opacity: 0.7;
}

.log-delete-btn:hover {
    background: var(--error-color);
    color: var(--text-inverse);
    opacity: 1;
    transform: scale(1.1);
}

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

.log-entry:hover .log-delete-btn {
    opacity: 1;
}

.no-logs {
    text-align: center;
    color: var(--text-muted);
    font-style: italic;
    padding: var(--spacing-xl);
}

/* ===== NOTIFICATIONS ===== */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--bg-secondary);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text-primary);
    font-weight: 500;
    z-index: 10000;
    transform: translateX(100%);
    transition: transform var(--transition-normal);
    max-width: 300px;
    box-shadow: var(--shadow-md);
}

[data-theme="light"] .notification {
    border: 1px solid rgba(0, 0, 0, 0.1);
}

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

.notification-success {
    border-left: 4px solid var(--success-color);
}

.notification-error {
    border-left: 4px solid var(--error-color);
}

.notification-warning {
    border-left: 4px solid var(--warning-color);
}

.notification-info {
    border-left: 4px solid var(--info-color);
}

/* ===== ANIMATIONS ===== */
@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

@keyframes rotate {
    from { transform: translate(-50%, -50%) rotate(0deg); }
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

@keyframes loading {
    0% { width: 0%; }
    50% { width: 70%; }
    100% { width: 100%; }
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(-20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .app-container {
        padding: var(--spacing-md);
    }

    .header-content {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .app-title {
        font-size: var(--font-size-2xl);
    }

    .timer-display {
        font-size: var(--font-size-3xl);
    }

    .activity-grid {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
        gap: var(--spacing-sm);
    }

    .activity-btn {
        height: 70px;
        font-size: var(--font-size-xs);
        padding: var(--spacing-xs);
    }

    .progress-cards {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }

    .history-controls {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .modal-content {
        margin: var(--spacing-md);
        max-height: calc(100vh - 2 * var(--spacing-md));
    }

    .modal-actions {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .timer-section {
        padding: var(--spacing-md);
    }

    .timer-display {
        font-size: var(--font-size-2xl);
    }

    .activity-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-xs);
    }

    .activity-btn {
        height: 60px;
        font-size: 10px;
    }

    .section-header {
        flex-direction: column;
        gap: var(--spacing-sm);
        align-items: flex-start;
    }
}

/* ===== ACCESSIBILITY ===== */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

.btn:focus,
.control-btn:focus,
.activity-btn:focus,
.close-btn:focus,
.date-picker:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

@media (prefers-contrast: high) {
    :root {
        --bg-primary: #000000;
        --bg-secondary: #1a1a1a;
        --text-primary: #ffffff;
        --text-secondary: #cccccc;
    }
}

/* ===== PRINT STYLES ===== */
@media print {
    .header-controls,
    .timer-controls,
    .btn,
    .modal {
        display: none !important;
    }

    .app-container {
        max-width: none;
        padding: 0;
    }

    .timer-section,
    .quick-actions {
        break-inside: avoid;
    }
}

/* Reset Section Styles */
.reset-section {
    border-top: 1px solid var(--text-muted);
    padding-top: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.reset-section h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-lg);
}

.reset-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.btn-warning {
    background: var(--warning-color);
    color: var(--text-inverse);
}

.btn-warning:hover {
    background: #ff8800;
}

.btn-danger {
    background: var(--error-color);
    color: var(--text-inverse);
}

.btn-danger:hover {
    background: #ff6666;
}

.reset-section .help-text {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.5;
}

.reset-section .help-text strong {
    color: var(--text-primary);
}

.activity-columns {
    display: flex;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-md);
    flex-wrap: wrap;
}

.activity-column {
    flex: 1 1 0;
    min-width: 220px;
    display: flex;
    flex-direction: column;
    background: var(--bg-glass);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
}

.activity-column-title {
    font-size: var(--font-size-md);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    letter-spacing: 0.5px;
    text-align: left;
}

.work-grid, .nonwork-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: var(--spacing-md);
}

@media (max-width: 900px) {
    .activity-columns {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    .activity-column {
        min-width: 0;
        padding: var(--spacing-sm);
    }
}

@media (max-width: 600px) {
    .activity-name {
        font-size: var(--font-size-sm);
    }
}