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

:root {
    /* Ocean Blue Meditation Color Palette */
    --primary-color: #0ea5e9;
    --primary-light: #38bdf8;
    --primary-dark: #0284c7;
    --secondary-color: #e0f2fe;
    --accent-color: #06b6d4;
    --danger-color: #f87171;
    --warning-color: #fbbf24;
    
    /* Neutral Colors */
    --gray-50: #fafafa;
    --gray-100: #f5f5f5;
    --gray-200: #e5e5e5;
    --gray-300: #d4d4d4;
    --gray-400: #a3a3a3;
    --gray-500: #737373;
    --gray-600: #525252;
    --gray-700: #404040;
    --gray-800: #262626;
    --gray-900: #171717;
    
    /* Theme Colors - Light Mode Default (Ocean & Sky) */
    --text-primary: #0a3a52;
    --text-secondary: #075985;
    --text-tertiary: #0369a1;
    --text-white: #ffffff;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f0f9ff;
    --bg-tertiary: #e0f2fe;
    --bg-overlay: rgba(12, 74, 110, 0.4);
    --bg-glass: rgba(255, 255, 255, 0.98);
    --bg-glass-secondary: rgba(240, 249, 255, 0.9);
    
    --border-color: #bae6fd;
    --border-light: rgba(186, 230, 253, 0.5);
    
    /* Soothing Ocean Gradients for Meditation */
    --gradient-primary: linear-gradient(135deg, #0ea5e9 0%, #06b6d4 100%);
    --gradient-calm: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 50%, #a5f3fc 100%);
    --gradient-evening: linear-gradient(135deg, #e0f2fe 0%, #bae6fd 50%, #7dd3fc 100%);
    --gradient-sunset: linear-gradient(135deg, #fef3c7 0%, #93c5fd 100%);
    --gradient-ocean: linear-gradient(135deg, #67e8f9 0%, #3b82f6 100%);
    --gradient-sky: linear-gradient(135deg, #e0f2fe 0%, #bae6fd 100%);
    
    /* Ocean-Inspired Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(14, 165, 233, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(14, 165, 233, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(14, 165, 233, 0.12);
    --shadow-xl: 0 20px 25px -5px rgba(14, 165, 233, 0.15);
    --shadow-glow: 0 0 30px rgba(14, 165, 233, 0.25);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 50%;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    
    /* Typography */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Dark Mode Theme - Deep Ocean for Evening Meditation */
[data-theme="dark"] {
    --text-primary: #f0f9ff;
    --text-secondary: #e0f2fe;
    --text-tertiary: #bae6fd;
    
    --bg-primary: #082f49;
    --bg-secondary: #0c4a6e;
    --bg-tertiary: #075985;
    --bg-overlay: rgba(8, 47, 73, 0.6);
    --bg-glass: rgba(8, 47, 73, 0.98);
    --bg-glass-secondary: rgba(12, 74, 110, 0.85);
    
    --border-color: #075985;
    --border-light: rgba(186, 230, 253, 0.12);
    
    --gradient-calm: linear-gradient(135deg, #0c4a6e 0%, #075985 50%, #0369a1 100%);
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.6);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.7);
    --shadow-glow: 0 0 30px rgba(14, 165, 233, 0.3);
}

/* Dark mode header styling */
[data-theme="dark"] .app-header {
    background: linear-gradient(135deg, #0c4a6e 0%, #075985 100%);
    border-bottom: 2px solid #0ea5e9;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .app-title {
    color: #f0f9ff;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.4);
}

[data-theme="dark"] .app-title i {
    color: #38bdf8;
    filter: drop-shadow(0 0 8px rgba(56, 189, 248, 0.5));
}

html {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--gradient-calm);
    min-height: 100vh;
    width: 100%;
    margin: 0;
    padding: 0;
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background var(--transition-slow), color var(--transition-base);
}

/* ===== APP LAYOUT ===== */
.app-container {
    max-width: 1200px;
    margin: 0 auto;
    min-height: 100vh;
    width: 100%;
    display: flex;
    flex-direction: column;
    background: var(--bg-glass-secondary);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-light);
    transition: all var(--transition-base);
}

/* ===== HEADER ===== */
.app-header {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    backdrop-filter: blur(20px);
    border-bottom: 2px solid var(--border-color);
    padding: var(--space-lg) var(--space-xl);
    transition: all var(--transition-base);
    box-shadow: 0 2px 8px rgba(14, 165, 233, 0.1);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.app-title {
    font-size: var(--font-size-2xl);
    font-weight: 900;
    color: #1e3a8a;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    text-shadow: 0 2px 4px rgba(255, 255, 255, 0.8);
    letter-spacing: -0.025em;
}

.app-title i {
    color: #0ea5e9;
    font-size: var(--font-size-xl);
    font-weight: 900;
    filter: drop-shadow(0 1px 2px rgba(14, 165, 233, 0.3));
}

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

.icon-btn {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: var(--space-sm);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    color: var(--text-secondary);
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.icon-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: var(--primary-color);
    opacity: 0.1;
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width var(--transition-base), height var(--transition-base);
}

.icon-btn:hover::before {
    width: 100%;
    height: 100%;
}

.icon-btn:hover {
    background: var(--bg-tertiary);
    color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
}

.icon-btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

/* ===== MAIN TIMER SECTION ===== */
.timer-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-2xl) var(--space-xl);
}

/* ===== AUDIO NOTIFICATION ===== */
.audio-notification {
    background: rgba(251, 207, 232, 0.15);
    border: 1px solid rgba(236, 201, 75, 0.25);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    margin-bottom: var(--space-lg);
    max-width: 500px;
    width: 100%;
    backdrop-filter: blur(10px);
}

.notification-content {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: #d97706;
    font-size: var(--font-size-sm);
    text-align: left;
}

.notification-content i {
    font-size: var(--font-size-lg);
    flex-shrink: 0;
}

.notification-content a {
    color: var(--primary-color);
    text-decoration: underline;
}

.dismiss-btn {
    background: none;
    border: none;
    color: #d97706;
    cursor: pointer;
    font-size: var(--font-size-lg);
    padding: var(--space-xs);
    margin-left: auto;
    flex-shrink: 0;
}

.dismiss-btn:hover {
    background: rgba(251, 207, 232, 0.2);
    border-radius: var(--radius-sm);
}

.timer-container {
    text-align: center;
    max-width: 600px;
    width: 100%;
}

/* ===== TIMER DISPLAY ===== */
.timer-display {
    margin-bottom: var(--space-2xl);
}

.timer-circle {
    position: relative;
    display: inline-block;
    margin-bottom: var(--space-xl);
}

.progress-ring {
    transform: rotate(-90deg);
    filter: drop-shadow(0 8px 20px rgba(14, 165, 233, 0.3));
    transition: filter var(--transition-base);
}

.progress-ring-circle-bg {
    transition: stroke var(--transition-base);
}

.progress-ring-circle {
    transition: stroke-dashoffset 0.5s ease-in-out, stroke var(--transition-base);
}

[data-theme="dark"] .progress-ring {
    filter: drop-shadow(0 8px 24px rgba(14, 165, 233, 0.4));
}

[data-theme="dark"] .progress-ring-circle-bg {
    stroke: #075985;
}

[data-theme="dark"] .progress-ring-circle {
    stroke: #38bdf8;
}

.timer-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--text-primary);
    transition: color var(--transition-base);
}

.time-display {
    font-size: var(--font-size-5xl);
    font-weight: 300;
    margin-bottom: var(--space-sm);
    font-feature-settings: 'tnum';
    transition: color var(--transition-base);
}

.minutes, .seconds {
    font-weight: 400;
}

.separator {
    opacity: 0.6;
    animation: blink 1.5s infinite;
}

@keyframes blink {
    0%, 50% { opacity: 0.6; }
    51%, 100% { opacity: 0.2; }
}

.session-type {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ===== TIMER CONTROLS ===== */
.timer-controls {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    margin-bottom: var(--space-2xl);
}

.primary-btn {
    background: var(--primary-color);
    color: var(--text-white);
    border: none;
    padding: var(--space-lg) var(--space-2xl);
    border-radius: var(--radius-xl);
    font-size: var(--font-size-lg);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    box-shadow: var(--shadow-lg);
    min-width: 140px;
    position: relative;
    overflow: hidden;
}

.primary-btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width var(--transition-slow), height var(--transition-slow);
}

.primary-btn:hover::after {
    width: 300px;
    height: 300px;
}

.primary-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
}

.primary-btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-md);
}

.primary-btn:focus-visible {
    outline: 3px solid var(--primary-light);
    outline-offset: 2px;
}

.secondary-btn {
    background: var(--bg-primary);
    color: var(--text-secondary);
    border: 2px solid var(--border-color);
    padding: var(--space-lg) var(--space-xl);
    border-radius: var(--radius-xl);
    font-size: var(--font-size-base);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

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

.secondary-btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.secondary-btn:focus-visible {
    outline: 3px solid var(--primary-light);
    outline-offset: 2px;
}

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

/* ===== TIME PRESETS ===== */
.time-presets {
    margin-bottom: var(--space-xl);
}

.time-presets h3 {
    font-size: var(--font-size-lg);
    font-weight: 500;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.preset-buttons {
    display: flex;
    gap: var(--space-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.preset-btn {
    background: var(--bg-glass-secondary);
    border: 2px solid var(--border-color);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    color: var(--text-primary);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.preset-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.2), transparent);
    transition: left var(--transition-base);
}

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

.preset-btn:hover {
    background: var(--bg-glass);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
}

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

.preset-btn.active {
    background: var(--primary-color);
    color: var(--text-white);
    border-color: var(--primary-dark);
    box-shadow: var(--shadow-md), var(--shadow-glow);
    transform: scale(1.05);
}

.preset-btn:focus-visible {
    outline: 3px solid var(--primary-light);
    outline-offset: 2px;
}

/* ===== CUSTOM TIMER INPUT ===== */
.custom-timer {
    margin-bottom: var(--space-xl);
}

.custom-timer h3 {
    font-size: var(--font-size-lg);
    font-weight: 500;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.time-input {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.time-field {
    background: var(--bg-glass-secondary);
    border: 2px solid var(--border-color);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    width: 80px;
    text-align: center;
    transition: all var(--transition-base);
    color: var(--text-primary);
}

.time-field:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    background: var(--bg-glass);
}

.time-field:hover {
    border-color: var(--primary-light);
}

.time-input label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: 500;
}

.set-btn {
    background: var(--accent-color);
    color: var(--text-white);
    border: none;
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.set-btn:hover {
    background: #0891b2;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.set-btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.set-btn:focus-visible {
    outline: 3px solid rgba(6, 182, 212, 0.3);
    outline-offset: 2px;
}

/* ===== BOTTOM PANEL ===== */
.bottom-panel {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border-top: 1px solid var(--border-color);
    padding: var(--space-xl);
    transition: all var(--transition-base);
}

/* ===== AUDIO SECTION ===== */
.audio-section {
    margin-bottom: var(--space-xl);
}

.audio-controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: center;
}

.bell-settings {
    display: flex;
    gap: var(--space-lg);
    align-items: center;
    flex-wrap: wrap;
}

.checkbox-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    position: relative;
    padding-left: 28px;
}

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

.checkmark {
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    height: 20px;
    width: 20px;
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
}

.checkbox-label:hover input ~ .checkmark {
    border-color: var(--primary-color);
    background: var(--bg-secondary);
}

.checkbox-label input:checked ~ .checkmark {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.checkbox-label input:focus-visible ~ .checkmark {
    outline: 3px solid var(--primary-light);
    outline-offset: 2px;
}

.checkmark:after {
    content: "";
    position: absolute;
    display: none;
    left: 6px;
    top: 2px;
    width: 6px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.checkbox-label input:checked ~ .checkmark:after {
    display: block;
}

.interval-select {
    background: var(--bg-primary);
    border: 2px solid var(--gray-200);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    margin-left: var(--space-sm);
    transition: all 0.2s ease;
}

.interval-select:enabled:focus {
    outline: none;
    border-color: var(--primary-color);
}

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

/* ===== VOLUME CONTROL ===== */
.volume-control {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    justify-content: center;
}

.volume-control i {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.volume-slider {
    width: 120px;
    height: 4px;
    border-radius: var(--radius-full);
    background: var(--gray-200);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

.volume-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: var(--radius-full);
    background: var(--primary-color);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease;
}

.volume-slider::-webkit-slider-thumb:hover {
    background: var(--primary-dark);
    transform: scale(1.1);
}

.volume-slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: var(--radius-full);
    background: var(--primary-color);
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-sm);
}

/* ===== PROGRESS SECTION ===== */
.progress-section h3 {
    font-size: var(--font-size-lg);
    font-weight: 500;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
    text-align: center;
}

.progress-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
    text-align: center;
}

.stat-item {
    background: var(--bg-glass-secondary);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-light);
    transition: all var(--transition-base);
}

.stat-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    background: var(--bg-glass);
    border-color: var(--primary-light);
}

.stat-value {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: var(--space-xs);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ===== MODAL STYLES ===== */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-overlay);
    backdrop-filter: blur(8px);
    animation: fadeIn var(--transition-base);
}

@keyframes fadeIn {
    from { 
        opacity: 0;
        backdrop-filter: blur(0);
    }
    to { 
        opacity: 1;
        backdrop-filter: blur(8px);
    }
}

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

.modal-content {
    background: var(--bg-primary);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    max-width: 90vw;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUp var(--transition-base);
    border: 1px solid var(--border-color);
}

@keyframes slideUp {
    from { 
        transform: translateY(50px) scale(0.95);
        opacity: 0;
    }
    to { 
        transform: translateY(0) scale(1);
        opacity: 1;
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-xl);
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
    border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
}

.modal-header h2 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
}

.close-btn {
    background: none;
    border: none;
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--space-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    transform: rotate(90deg);
}

.close-btn:focus-visible {
    outline: 3px solid var(--primary-light);
    outline-offset: 2px;
}

.modal-body {
    padding: var(--space-xl);
}

/* ===== SETTINGS MODAL ===== */
.setting-group {
    margin-bottom: var(--space-2xl);
}

.setting-group h3 {
    font-size: var(--font-size-lg);
    font-weight: 500;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.setting-select {
    background: var(--bg-secondary);
    border: 2px solid var(--gray-200);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    width: 100%;
    max-width: 300px;
    margin-bottom: var(--space-sm);
    transition: all 0.2s ease;
}

.setting-select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.test-btn, .action-btn {
    background: var(--primary-color);
    color: var(--text-white);
    border: none;
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all 0.2s ease;
    margin-right: var(--space-sm);
    margin-top: var(--space-sm);
}

.test-btn:hover, .action-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.danger-btn {
    background: var(--danger-color);
    color: var(--text-white);
    border: none;
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all 0.2s ease;
    margin-top: var(--space-sm);
}

.danger-btn:hover {
    background: var(--danger-color);
    transform: translateY(-1px);
}

.time-input-field {
    background: var(--bg-secondary);
    border: 2px solid var(--gray-200);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    margin-left: var(--space-md);
    transition: all 0.2s ease;
}

.time-input-field:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* ===== STATS MODAL ===== */
.stats-overview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-2xl);
}

.overview-stat {
    text-align: center;
    padding: var(--space-lg);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
}

.stat-number {
    font-size: var(--font-size-3xl);
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: var(--space-sm);
}

.stat-title {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.chart-section {
    margin-bottom: var(--space-2xl);
}

.chart-container {
    height: 200px;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    border: 1px solid var(--gray-200);
}

.sessions-list {
    max-height: 300px;
    overflow-y: auto;
}

.session-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-sm);
    border: 1px solid var(--gray-200);
}

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

.session-duration {
    font-size: var(--font-size-base);
    color: var(--primary-color);
    font-weight: 600;
}

/* ===== COMPLETION MODAL ===== */
.celebration {
    text-align: center;
    max-width: 400px;
}

.celebration-content {
    padding: var(--space-2xl);
}

.celebration-icon {
    font-size: 4rem;
    color: var(--accent-color);
    margin-bottom: var(--space-lg);
    animation: bounce 0.8s ease;
}

@keyframes bounce {
    0%, 20%, 53%, 80%, 100% { transform: translate3d(0,0,0); }
    40%, 43% { transform: translate3d(0, -8px, 0); }
    70% { transform: translate3d(0, -4px, 0); }
    90% { transform: translate3d(0, -2px, 0); }
}

.celebration-content h2 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

.celebration-content p {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
}

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

.completion-stat {
    background: var(--bg-secondary);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
}

.completion-stat .stat-value {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--primary-color);
    display: block;
    margin-bottom: var(--space-xs);
}

.completion-stat .stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: 500;
}

.completion-actions {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
}

/* ===== THEME TOGGLE BUTTON ===== */
#themeToggle {
    position: relative;
}

#themeToggle i {
    transition: transform var(--transition-base);
}

#themeToggle:hover i {
    transform: rotate(15deg);
}

/* ===== ENHANCED BUTTON ANIMATIONS ===== */
button, .icon-btn, .preset-btn {
    -webkit-tap-highlight-color: transparent;
}

/* ===== SMOOTH TRANSITIONS FOR ALL ELEMENTS ===== */
* {
    transition-property: background-color, border-color, color, box-shadow, transform;
    transition-duration: var(--transition-base);
    transition-timing-function: ease;
}

/* Don't apply transitions to position, width, height, etc */
*:not(svg):not(circle):not(path) {
    transition-property: background-color, border-color, color, box-shadow, transform, opacity;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .app-container {
        margin: 0;
        border-radius: 0;
        border: none;
        max-width: 100%;
        width: 100vw;
    }
    
    .app-header {
        padding: var(--space-md) var(--space-lg);
    }
    
    .app-title {
        font-size: var(--font-size-xl);
    }
    
    .header-actions {
        gap: var(--space-xs);
    }
    
    .icon-btn {
        width: 40px;
        height: 40px;
    }
    
    .timer-section {
        padding: var(--space-xl) var(--space-md);
    }
    
    .timer-circle svg {
        width: 240px;
        height: 240px;
    }
    
    .progress-ring-circle,
    .progress-ring-circle-bg {
        r: 114;
        cx: 120;
        cy: 120;
    }
    
    .time-display {
        font-size: var(--font-size-4xl);
    }
    
    .timer-controls {
        flex-direction: column;
        align-items: center;
        gap: var(--space-sm);
    }
    
    .primary-btn, .secondary-btn {
        width: 100%;
        max-width: 250px;
        justify-content: center;
    }
    
    .preset-buttons {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--space-xs);
    }
    
    .audio-controls {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
        text-align: center;
    }
    
    .bell-settings {
        justify-content: center;
        flex-wrap: wrap;
        gap: var(--space-md);
    }
    
    .progress-stats {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }
    
    .modal-content {
        max-width: 95vw;
        margin: var(--space-md);
    }
    
    .stats-overview {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .completion-actions {
        flex-direction: column;
    }
    
    .bottom-panel {
        padding: var(--space-lg);
    }
}

@media (max-width: 480px) {
    .app-container {
        padding-top: env(safe-area-inset-top);
        padding-bottom: env(safe-area-inset-bottom);
        padding-left: env(safe-area-inset-left);
        padding-right: env(safe-area-inset-right);
    }
    
    .app-header {
        padding: var(--space-sm) var(--space-md);
    }
    
    .header-content {
        gap: var(--space-sm);
    }
    
    .app-title {
        font-size: var(--font-size-lg);
    }
    
    .icon-btn {
        width: 36px;
        height: 36px;
        font-size: var(--font-size-sm);
    }
    
    .timer-circle svg {
        width: 200px;
        height: 200px;
    }
    
    .progress-ring-circle,
    .progress-ring-circle-bg {
        r: 94;
        cx: 100;
        cy: 100;
    }
    
    .time-display {
        font-size: var(--font-size-3xl);
    }
    
    .session-type {
        font-size: var(--font-size-xs);
    }
    
    .preset-buttons {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-xs);
    }
    
    .preset-btn {
        padding: var(--space-xs) var(--space-sm);
        font-size: var(--font-size-xs);
    }
    
    .bell-settings {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-sm);
    }
    
    .checkbox-label {
        font-size: var(--font-size-xs);
        padding-left: 24px;
    }
    
    .checkmark {
        width: 16px;
        height: 16px;
    }
    
    .stats-overview {
        grid-template-columns: 1fr;
    }
    
    .modal-header {
        padding: var(--space-md);
    }
    
    .modal-header h2 {
        font-size: var(--font-size-lg);
    }
    
    .modal-body {
        padding: var(--space-md);
    }
    
    .bottom-panel {
        padding: var(--space-md);
    }
}

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

/* Enhanced focus styles for keyboard navigation */
button:focus-visible,
input:focus-visible,
select:focus-visible,
a:focus-visible {
    outline: 3px solid var(--primary-color);
    outline-offset: 3px;
    border-radius: var(--radius-sm);
}

/* Remove default focus for mouse users */
button:focus:not(:focus-visible),
input:focus:not(:focus-visible),
select:focus:not(:focus-visible),
a:focus:not(:focus-visible) {
    outline: none;
}

/* Better touch targets for mobile */
@media (pointer: coarse) {
    button, .icon-btn, .preset-btn, .checkbox-label {
        min-height: 44px;
        min-width: 44px;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #0369a1;
        --text-primary: #000000;
        --text-secondary: #0c4a6e;
        --border-color: #0284c7;
    }
}

/* ===== DARK MODE SUPPORT ===== */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --text-primary: #e0f2fe;
        --text-secondary: #bae6fd;
        --bg-primary: #082f49;
        --bg-secondary: #0c4a6e;
        --border-color: #075985;
        --bg-glass: rgba(12, 74, 110, 0.95);
        --bg-glass-secondary: rgba(12, 74, 110, 0.75);
    }
    
    body:not([data-theme="light"]) {
        background: linear-gradient(135deg, #0c4a6e 0%, #075985 50%, #0369a1 100%);
    }
    
    .app-header:not([data-theme="light"]) {
        background: rgba(12, 74, 110, 0.95);
        border-bottom-color: #075985;
    }
    
    .bottom-panel:not([data-theme="light"]) {
        background: rgba(12, 74, 110, 0.95);
        border-top-color: #075985;
    }
}

/* ===== PRINT STYLES ===== */
@media print {
    .app-container {
        background: white;
        color: black;
        box-shadow: none;
    }
    
    .timer-section {
        page-break-inside: avoid;
    }
    
    .modal {
        display: none !important;
    }
    
    .audio-controls,
    .timer-controls {
        display: none;
    }
}

/* ===== CUSTOM SCROLLBAR STYLES ===== */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: var(--radius-lg);
    transition: background var(--transition-base);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}

/* Firefox scrollbar */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) var(--bg-secondary);
}

/* ===== LOADING ANIMATION ===== */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.loading {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* ===== FADE IN ANIMATION FOR PAGE LOAD ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.app-container {
    animation: fadeInUp 0.6s ease-out;
}

/* ===== BREATHING ANIMATION ===== */
@keyframes breathePulse {
    0%, 100% {
        filter: drop-shadow(0 8px 20px rgba(14, 165, 233, 0.25));
    }
    50% {
        filter: drop-shadow(0 8px 32px rgba(14, 165, 233, 0.65));
    }
}

@keyframes breatheTextCycle {
    0%, 10% { opacity: 0; }
    20%, 40% { opacity: 1; }
    50%, 60% { opacity: 0; }
    70%, 90% { opacity: 1; }
    100% { opacity: 0; }
}

.timer-circle.timer-running .progress-ring {
    animation: breathePulse 4s ease-in-out infinite;
}

.breathing-guide {
    margin-top: var(--space-md);
    height: 2rem;
    opacity: 0;
    transition: opacity var(--transition-slow);
    text-align: center;
    pointer-events: none;
}

.breathing-guide.visible {
    opacity: 1;
}

.breathing-text {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-style: italic;
    letter-spacing: 0.05em;
    animation: breatheTextCycle 8s ease-in-out infinite;
}

/* ===== WEEKLY CHART ===== */
.chart-bars {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    height: 150px;
    gap: 8px;
    padding: 0 var(--space-sm);
}

.chart-bar-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    flex: 1;
    height: 100%;
    justify-content: flex-end;
}

.chart-bar-wrap {
    width: 100%;
    height: 120px;
    display: flex;
    align-items: flex-end;
    justify-content: center;
}

.chart-bar {
    width: 100%;
    max-width: 36px;
    min-height: 4px;
    background: var(--border-color);
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    position: relative;
    transition: height var(--transition-base), background var(--transition-base);
}

.chart-bar.has-data {
    background: var(--primary-color);
    opacity: 0.7;
}

.chart-bar.today {
    background: var(--primary-color);
    opacity: 1;
    box-shadow: 0 -2px 8px rgba(14, 165, 233, 0.4);
}

.chart-bar-tip {
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 10px;
    color: var(--text-secondary);
    white-space: nowrap;
}

.chart-day-label {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    font-weight: 500;
}

.chart-day-label.today {
    color: var(--primary-color);
    font-weight: 700;
}

.chart-empty-message {
    text-align: center;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    padding: var(--space-xl);
}

.sessions-empty {
    text-align: center;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    padding: var(--space-lg);
}