:root {
    --primary-color: #2D1B69;
    --secondary-color: #512B81;
    --tertiary-color: #635985;
    --accent-color: #89C4E1;
    --light-color: #F5E9CF;
    --white: #ffffff;
    --dark: #1a1a1a;
    --gray: #666666;
    --success: #28a745;
    --warning: #ffc107;
    --danger: #dc3545;
    --border-radius: 12px;
    --shadow: 0 4px 20px rgba(45, 27, 105, 0.1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background: linear-gradient(135deg, var(--light-color), var(--white));
    min-height: 100vh;
    overflow-x: hidden;
}

body.dark-mode {
    --white: #1a1a1a;
    --light-color: #2a2a2a;
    --dark: #ffffff;
    --gray: #cccccc;
    background: linear-gradient(135deg, #1a1a1a, #2a2a2a);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(45, 27, 105, 0.1);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: var(--transition);
}

.dark-mode .header {
    background: rgba(26, 26, 26, 0.95);
    border-bottom-color: rgba(137, 196, 225, 0.1);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 0;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--primary-color);
    cursor: pointer;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    margin: 0;
}

.nav-link {
    text-decoration: none;
    color: var(--gray);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
    background: rgba(45, 27, 105, 0.1);
}

/* Main Content */
.main {
    margin-top: 80px;
    min-height: calc(100vh - 80px);
}

.section {
    display: none;
    padding: 2rem 0;
    min-height: calc(100vh - 160px);
}

.section.active {
    display: block;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 3rem 0;
    margin-bottom: 3rem;
}

.hero h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    color: var(--gray);
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.quick-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    min-height: 44px;
    justify-content: center;
}

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

.btn-primary:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(45, 27, 105, 0.2);
}

.btn-secondary {
    background: var(--tertiary-color);
    color: var(--white);
}

.btn-secondary:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
}

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

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

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

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

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

.btn-icon {
    padding: 0.5rem;
    min-width: 44px;
    min-height: 44px;
}

.btn-small {
    padding: 0.25rem 0.5rem;
    font-size: 0.875rem;
    min-height: 32px;
}

/* Feature Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.feature-card {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
    border: 1px solid rgba(45, 27, 105, 0.1);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(45, 27, 105, 0.15);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.feature-card p {
    color: var(--gray);
}

/* Focus Section */
.focus-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.focus-header h2 {
    color: var(--primary-color);
    font-size: 2rem;
}

.session-controls {
    display: flex;
    gap: 0.5rem;
}

.focus-timer {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem;
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.timer-display {
    font-size: 4rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 2rem;
    font-family: 'Courier New', monospace;
}

.timer-controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.focus-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.option-group {
    background: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.option-group h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.sound-controls {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.volume-control {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.volume-control input[type="range"] {
    flex: 1;
    height: 6px;
    border-radius: 3px;
    background: var(--light-color);
    outline: none;
    -webkit-appearance: none;
}

.volume-control input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
}

#audioVisualizer {
    width: 100%;
    height: 100px;
    border-radius: var(--border-radius);
    background: var(--light-color);
    margin-top: 1rem;
}

.blocked-sites {
    margin-bottom: 1rem;
}

.blocked-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem;
    background: var(--light-color);
    border-radius: var(--border-radius);
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

.remove-block {
    background: var(--danger);
    color: var(--white);
    border: none;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    cursor: pointer;
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.add-block {
    display: flex;
    gap: 0.5rem;
}

.add-block input {
    flex: 1;
    padding: 0.5rem;
    border: 1px solid var(--gray);
    border-radius: var(--border-radius);
    font-size: 0.875rem;
}

/* Breathing Exercise */
.breathing-exercise {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.9);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 2000;
}

.breathing-circle {
    width: 200px;
    height: 200px;
    border: 4px solid var(--accent-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 2rem;
    animation: breathe 4s infinite ease-in-out;
}

.breathing-text {
    color: var(--white);
    font-size: 1.5rem;
    font-weight: 600;
}

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

#closeBreathingBtn {
    position: absolute;
    top: 2rem;
    right: 2rem;
}

/* Stats Section */
.stats-overview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.stat-card {
    background: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-3px);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--gray);
    font-size: 0.875rem;
}

.achievements {
    margin-bottom: 3rem;
}

.achievements h3 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.achievement-card {
    background: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
    border: 2px solid transparent;
}

.achievement-card.unlocked {
    border-color: var(--accent-color);
    background: linear-gradient(135deg, var(--white), var(--light-color));
}

.achievement-card.locked {
    opacity: 0.6;
    filter: grayscale(100%);
}

.achievement-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.achievement-name {
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.achievement-desc {
    color: var(--gray);
    font-size: 0.875rem;
}

.insights h3 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.insight-cards {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.insight-card {
    background: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.insight-icon {
    font-size: 1.5rem;
    color: var(--accent-color);
    flex-shrink: 0;
}

.insight-text {
    color: var(--gray);
    line-height: 1.6;
}

/* Settings Section */
.settings-groups {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin-bottom: 2rem;
}

.setting-group {
    background: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.setting-group h3 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.25rem;
}

.setting-item {
    margin-bottom: 1.5rem;
}

.setting-item:last-child {
    margin-bottom: 0;
}

.setting-item label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--dark);
}

.setting-item input[type="number"],
.setting-item input[type="text"] {
    width: 100%;
    max-width: 200px;
    padding: 0.5rem;
    border: 1px solid var(--gray);
    border-radius: var(--border-radius);
    font-size: 1rem;
}

.setting-item input[type="range"] {
    width: 100%;
    max-width: 300px;
    margin-right: 1rem;
}

.setting-item input[type="checkbox"] {
    margin-right: 0.5rem;
    transform: scale(1.2);
}

.work-contexts {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.context-item {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.context-item input {
    flex: 1;
}

.setting-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

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

/* FAQ Section */
.faq-section {
    background: var(--white);
    padding: 3rem 0;
    margin-top: 3rem;
}

.faq-section h2 {
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 2rem;
    font-size: 2rem;
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid rgba(45, 27, 105, 0.1);
    margin-bottom: 1rem;
}

.faq-question {
    width: 100%;
    padding: 1.5rem;
    background: none;
    border: none;
    text-align: left;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-color);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.faq-question:hover {
    background: rgba(45, 27, 105, 0.05);
}

.faq-icon {
    font-size: 1.5rem;
    transition: var(--transition);
}

.faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 1.5rem 1.5rem;
    color: var(--gray);
    line-height: 1.6;
    animation: fadeIn 0.3s ease-in-out;
}

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

/* Footer */
footer {
    background: var(--primary-color);
    color: var(--white);
    text-align: center;
    padding: 2rem;
    margin-top: 3rem;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }
    
    .nav-menu {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 80px);
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        padding: 2rem;
        transition: var(--transition);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-link {
        padding: 1rem 2rem;
        width: 100%;
        text-align: center;
        font-size: 1.1rem;
    }
    
    .hero h2 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .quick-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 300px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .focus-header {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .timer-display {
        font-size: 3rem;
    }
    
    .timer-controls {
        flex-direction: column;
        align-items: center;
    }
    
    .focus-options {
        grid-template-columns: 1fr;
    }
    
    .sound-controls {
        flex-direction: column;
    }
    
    .stats-overview {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
    
    .achievements-grid {
        grid-template-columns: 1fr;
    }
    
    .setting-actions {
        flex-direction: column;
    }
    
    .breathing-circle {
        width: 150px;
        height: 150px;
    }
    
    .breathing-text {
        font-size: 1.2rem;
    }
    
    #closeBreathingBtn {
        position: static;
        margin-top: 2rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 2rem 0;
    }
    
    .hero h2 {
        font-size: 1.75rem;
    }
    
    .timer-display {
        font-size: 2.5rem;
    }
    
    .stats-overview {
        grid-template-columns: 1fr;
    }
    
    .stat-value {
        font-size: 1.5rem;
    }
    
    .faq-question {
        padding: 1rem;
        font-size: 1rem;
    }
    
    .faq-answer {
        padding: 0 1rem 1rem;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .breathing-circle {
        animation: none;
    }
}

/* Focus mode styles */
body.focus-mode {
    background: var(--dark);
    color: var(--white);
}

body.focus-mode .header,
body.focus-mode .nav-menu {
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.5s ease;
}

body.focus-mode .main {
    margin-top: 0;
}

/* High contrast mode */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #000000;
        --secondary-color: #333333;
        --accent-color: #0066cc;
        --white: #ffffff;
        --dark: #000000;
    }
}

/* Print styles */
@media print {
    .header,
    .nav-menu,
    .btn,
    .timer-controls,
    .session-controls,
    footer {
        display: none !important;
    }
    
    .main {
        margin-top: 0;
    }
    
    .section {
        display: block !important;
        page-break-after: always;
    }
    
    .container {
        max-width: none;
        padding: 0;
    }
}