/* Base Styles and Variables */
:root {
    /* Aurora UI Color Palette */
    --dark-blue: #222831;
    --gray-blue: #393E46;
    --teal: #00ADB5;
    --light-gray: #EEEEEE;
    --yellow: #FFD369;
    
    /* Light Mode Colors */
    --background: var(--light-gray);
    --card-bg: #ffffff;
    --text-primary: var(--dark-blue);
    --text-secondary: var(--gray-blue);
    --accent: var(--teal);
    --accent-hover: #008b92;
    --border: rgba(57, 62, 70, 0.2);
    --shadow: rgba(34, 40, 49, 0.1);
    
    /* Typography */
    --font-family: 'Montserrat', sans-serif;
    --font-size-small: 0.875rem;
    --font-size-base: 1rem;
    --font-size-large: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-xxl: 2rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-circle: 50%;
}

/* Dark Mode Colors */
.dark-mode {
    --background: var(--dark-blue);
    --card-bg: var(--gray-blue);
    --text-primary: var(--light-gray);
    --text-secondary: rgba(238, 238, 238, 0.8);
    --border: rgba(238, 238, 238, 0.2);
    --shadow: rgba(0, 0, 0, 0.3);
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    height: 100%;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: var(--font-size-xxl);
    color: var(--accent);
}

h2 {
    font-size: var(--font-size-xl);
    color: var(--text-primary);
}

h3 {
    font-size: var(--font-size-large);
    color: var(--text-primary);
}

p {
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--accent-hover);
}

/* Layout */
.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
    margin-bottom: var(--spacing-lg);
}

.logo {
    display: flex;
    flex-direction: column;
}

.tagline {
    font-size: var(--font-size-small);
    color: var(--text-secondary);
    margin-top: calc(-1 * var(--spacing-md));
}

.main-content {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
}

@media (min-width: 768px) {
    .main-content {
        grid-template-columns: 1fr 1fr;
    }
    
    .timer-section {
        grid-column: 1 / -1;
    }
}

@media (min-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr 1fr 1fr;
    }
    
    .timer-section {
        grid-column: 1 / 3;
        grid-row: 1;
    }
    
    .settings-section {
        grid-column: 3;
        grid-row: 1;
    }
    
    .suggestion-section {
        grid-column: 1;
        grid-row: 2;
    }
    
    .stats-section {
        grid-column: 2 / 4;
        grid-row: 2;
    }
}

/* Timer Section */
.timer-section {
    text-align: center;
    padding: var(--spacing-lg);
    background-color: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 12px var(--shadow);
    transition: background-color var(--transition-normal), box-shadow var(--transition-normal);
}

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

.timer-circle {
    position: relative;
    width: 280px;
    height: 280px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.timer-progress {
    position: absolute;
    top: 0;
    left: 0;
    transform: rotate(-90deg);
}

.timer-progress-bg {
    fill: none;
    stroke: var(--border);
    stroke-width: 10;
}

.timer-progress-fill {
    fill: none;
    stroke: var(--accent);
    stroke-width: 10;
    stroke-linecap: round;
    stroke-dasharray: 754;
    stroke-dashoffset: 754;
    transition: stroke-dashoffset var(--transition-slow);
}

.timer-text {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.timer-mode {
    font-size: var(--font-size-large);
    color: var(--accent);
    font-weight: 600;
    margin-top: var(--spacing-sm);
}

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

/* Settings Section */
.settings-section {
    padding: var(--spacing-lg);
    background-color: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 12px var(--shadow);
    transition: background-color var(--transition-normal), box-shadow var(--transition-normal);
}

.settings-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

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

.settings-group label {
    font-weight: 500;
    color: var(--text-secondary);
}

.number-input {
    display: flex;
    align-items: center;
    height: 40px;
}

.number-input button {
    width: 40px;
    height: 40px;
    background-color: var(--accent);
    color: white;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.number-input button:hover {
    background-color: var(--accent-hover);
}

.number-input button.decrease {
    border-radius: var(--radius-sm) 0 0 var(--radius-sm);
}

.number-input button.increase {
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.number-input input {
    width: 60px;
    height: 40px;
    text-align: center;
    border: 1px solid var(--border);
    border-left: none;
    border-right: none;
    font-size: var(--font-size-base);
    color: var(--text-primary);
    background-color: var(--card-bg);
}

select {
    height: 40px;
    padding: 0 var(--spacing-md);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background-color: var(--card-bg);
    color: var(--text-primary);
    font-size: var(--font-size-base);
    cursor: pointer;
    transition: border-color var(--transition-fast);
}

select:focus {
    border-color: var(--accent);
    outline: none;
}

/* Toggle Switch */
.toggle {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 24px;
}

.toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--border);
    transition: var(--transition-fast);
    border-radius: 24px;
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: var(--transition-fast);
    border-radius: 50%;
}

.toggle input:checked + .toggle-slider {
    background-color: var(--accent);
}

.toggle input:checked + .toggle-slider:before {
    transform: translateX(26px);
}

/* Suggestion Section */
.suggestion-section {
    padding: var(--spacing-lg);
    background-color: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 12px var(--shadow);
    transition: background-color var(--transition-normal), box-shadow var(--transition-normal);
}

.card {
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    background-color: rgba(0, 173, 181, 0.1);
    border-left: 4px solid var(--accent);
}

.card h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--accent);
}

/* Stats Section */
.stats-section {
    padding: var(--spacing-lg);
    background-color: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 12px var(--shadow);
    transition: background-color var(--transition-normal), box-shadow var(--transition-normal);
}

.stats-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.stat-card {
    padding: var(--spacing-md);
    text-align: center;
    border-radius: var(--radius-md);
    background-color: rgba(0, 173, 181, 0.05);
    transition: transform var(--transition-fast);
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-card h3 {
    font-size: var(--font-size-small);
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

.stat-value {
    font-size: var(--font-size-xxl);
    font-weight: 700;
    color: var(--accent);
}

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

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

.progress-bar {
    height: 12px;
    background-color: var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.progress-fill {
    height: 100%;
    background-color: var(--accent);
    width: 0%;
    transition: width var(--transition-normal);
}

.progress-text {
    font-size: var(--font-size-small);
    color: var(--text-secondary);
    text-align: right;
}

/* Buttons */
.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.btn:hover {
    transform: translateY(-2px);
}

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

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--accent-hover);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover:not(:disabled) {
    background-color: rgba(0, 0, 0, 0.05);
}

.dark-mode .btn-secondary:hover:not(:disabled) {
    background-color: rgba(255, 255, 255, 0.05);
}

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: var(--font-size-large);
    cursor: pointer;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-circle);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition-fast);
}

.theme-toggle:hover {
    background-color: rgba(0, 0, 0, 0.05);
}

.dark-mode .theme-toggle:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

.theme-toggle .fa-sun {
    display: none;
}

.theme-toggle .fa-moon {
    display: block;
}

.dark-mode .theme-toggle .fa-sun {
    display: block;
}

.dark-mode .theme-toggle .fa-moon {
    display: none;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 10;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.modal.show {
    display: flex;
    opacity: 1;
}

.modal-content {
    background-color: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    transform: translateY(20px);
    transition: transform var(--transition-normal);
}

.modal.show .modal-content {
    transform: translateY(0);
}

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

.modal-header h2 {
    margin-bottom: 0;
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

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

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

.modal-timer {
    font-size: 2.5rem;
    font-weight: 700;
    margin: var(--spacing-lg) 0;
    color: var(--accent);
}

.animation-container {
    height: 120px;
    margin: var(--spacing-lg) 0;
    display: flex;
    justify-content: center;
    align-items: center;
}

.modal-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
}

/* Breathing Animation */
.breathing-circle {
    width: 100px;
    height: 100px;
    background-color: var(--accent);
    border-radius: 50%;
    animation: breathing 5s infinite;
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
    font-weight: 600;
}

@keyframes breathing {
    0%, 100% {
        transform: scale(0.8);
        opacity: 0.8;
    }
    50% {
        transform: scale(1.2);
        opacity: 1;
    }
}

/* Footer */
.app-footer {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg) 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: var(--font-size-small);
    border-top: 1px solid var(--border);
}

/* Responsive adjustments */
@media (max-width: 480px) {
    .timer-circle {
        width: 220px;
        height: 220px;
    }
    
    .timer-progress {
        width: 220px;
        height: 220px;
    }
    
    .timer-progress-fill,
    .timer-progress-bg {
        cx: 110;
        cy: 110;
        r: 100;
    }
    
    .timer-text {
        font-size: 2.5rem;
    }
    
    .timer-controls {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .stats-container {
        grid-template-columns: 1fr;
    }
}

/* Accessibility focus styles */
button:focus-visible,
input:focus-visible,
select:focus-visible,
a:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

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

.pulse {
    animation: pulse 2s infinite;
}