/* CSS Reset and Base Styles */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    /* Color Palette */
    --primary-color: #2196F3;
    --success-color: #4CAF50;
    --warning-color: #FFC107;
    --danger-color: #F44336;
    --purple-color: #9C27B0;
    
    /* Light Theme */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-muted: #adb5bd;
    --border-color: #dee2e6;
    --shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 4px 8px rgba(0, 0, 0, 0.15);
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --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;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #404040;
    --text-primary: #ffffff;
    --text-secondary: #cccccc;
    --text-muted: #999999;
    --border-color: #404040;
    --shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 4px 8px rgba(0, 0, 0, 0.4);
}

/* Base Styles */
html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-color), var(--purple-color));
    color: white;
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.header__title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.header__subtitle {
    font-size: var(--font-size-lg);
    opacity: 0.9;
    margin-bottom: var(--spacing-lg);
}

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

/* Navigation */
.nav {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav__list {
    display: flex;
    list-style: none;
    overflow-x: auto;
    padding: var(--spacing-sm) 0;
}

.nav__item {
    flex-shrink: 0;
}

.nav__link {
    display: block;
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text-secondary);
    text-decoration: none;
    border: none;
    background: none;
    cursor: pointer;
    font-size: var(--font-size-sm);
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.nav__link:hover,
.nav__link--active {
    color: var(--primary-color);
    background-color: var(--bg-primary);
}

/* Main Content */
.main {
    min-height: calc(100vh - 200px);
    padding: var(--spacing-xl) 0;
}

/* Tab Content */
.tab-content {
    display: none;
}

.tab-content--active {
    display: block;
}

/* Section Titles */
.section-title {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    gap: var(--spacing-xs);
}

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

.btn--primary:hover {
    background-color: #1976D2;
    transform: translateY(-1px);
}

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

.btn--secondary:hover {
    background-color: var(--text-muted);
    color: white;
}

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

.btn--warning {
    background-color: var(--warning-color);
    color: #000;
}

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

/* Dashboard */
.dashboard {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2xl);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.stat-card {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow);
    transition: transform var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

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

.stat-card__icon {
    font-size: var(--font-size-2xl);
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.stat-card--primary .stat-card__icon {
    background-color: rgba(33, 150, 243, 0.1);
}

.stat-card--success .stat-card__icon {
    background-color: rgba(76, 175, 80, 0.1);
}

.stat-card--warning .stat-card__icon {
    background-color: rgba(255, 193, 7, 0.1);
}

.stat-card--info .stat-card__icon {
    background-color: rgba(156, 39, 176, 0.1);
}

.stat-card__title {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.stat-card__value {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
}

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

.dashboard__section {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow);
}

/* Content Section */
.content-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

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

.filters {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.filter-select {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
}

.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.content-card {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow);
    transition: transform var(--transition-fast);
}

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

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

.content-card__title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.content-card__type {
    font-size: var(--font-size-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-weight: 500;
}

.content-card__type--movie {
    background-color: rgba(33, 150, 243, 0.1);
    color: var(--primary-color);
}

.content-card__type--series {
    background-color: rgba(156, 39, 176, 0.1);
    color: var(--purple-color);
}

.content-card__info {
    margin-bottom: var(--spacing-md);
}

.content-card__duration {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.content-card__platform {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
}

.content-card__status {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 500;
    margin-bottom: var(--spacing-md);
}

.content-card__status--watching {
    background-color: rgba(255, 193, 7, 0.1);
    color: var(--warning-color);
}

.content-card__status--completed {
    background-color: rgba(76, 175, 80, 0.1);
    color: var(--success-color);
}

.content-card__status--to-watch {
    background-color: rgba(108, 117, 125, 0.1);
    color: var(--text-secondary);
}

.content-card__actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

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

.progress-bar__fill {
    height: 100%;
    background-color: var(--primary-color);
    transition: width var(--transition-normal);
}

/* Statistics */
.statistics-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.stats-detailed {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.stat-detail-card {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow);
}

.stat-detail-card h3 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.time-breakdown,
.curiosity-facts {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.time-item,
.fact-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm);
    background-color: var(--bg-primary);
    border-radius: var(--radius-md);
}

.time-label,
.fact-label {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.time-value,
.fact-value {
    font-weight: 600;
    color: var(--text-primary);
}

.rankings h4 {
    font-size: var(--font-size-base);
    margin: var(--spacing-md) 0 var(--spacing-sm) 0;
    color: var(--text-primary);
}

.ranking-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

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

/* Marathon Simulator */
.marathon-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.marathon-controls {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    align-items: end;
}

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

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

.marathon-result {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow);
}

.result-card h3 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.result-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.result-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
    background-color: var(--bg-primary);
    border-radius: var(--radius-md);
}

.result-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.result-value {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
}

/* Goals */
.goals-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.goals-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.goal-card {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow);
    transition: transform var(--transition-fast);
}

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

.goal-card__header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
}

.goal-card__title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
}

.goal-card__deadline {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.goal-card__description {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.goal-card__progress {
    margin-bottom: var(--spacing-md);
}

.goal-card__actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: flex-end;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    display: none;
}

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

.modal__backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal__content {
    position: relative;
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
}

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

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

.modal__close {
    background: none;
    border: none;
    font-size: var(--font-size-2xl);
    cursor: pointer;
    color: var(--text-secondary);
    padding: var(--spacing-xs);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
}

.modal__close:hover {
    background-color: var(--bg-tertiary);
}

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

/* Forms */
.form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

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

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

.form-input,
.form-select,
.form-textarea {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: var(--font-size-base);
    transition: border-color var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

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

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

.series-fields {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
}

/* Empty State */
.empty-state {
    text-align: center;
    color: var(--text-muted);
    font-style: italic;
    padding: var(--spacing-2xl);
}

/* Footer */
.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-lg) 0;
    margin-top: var(--spacing-2xl);
}

.footer__text {
    text-align: center;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.footer__link {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer__link:hover {
    color: #1976D2;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .header {
        padding: var(--spacing-lg) 0;
    }
    
    .header__title {
        font-size: var(--font-size-2xl);
    }
    
    .header__controls {
        flex-direction: column;
        align-items: center;
    }
    
    .nav__list {
        justify-content: flex-start;
        padding: var(--spacing-xs) 0;
    }
    
    .nav__link {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--font-size-xs);
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .dashboard__content {
        grid-template-columns: 1fr;
    }
    
    .section-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .filters {
        justify-content: stretch;
    }
    
    .filter-select {
        flex: 1;
    }
    
    .content-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-detailed {
        grid-template-columns: 1fr;
    }
    
    .marathon-controls {
        grid-template-columns: 1fr;
    }
    
    .result-details {
        grid-template-columns: 1fr;
    }
    
    .goals-grid {
        grid-template-columns: 1fr;
    }
    
    .series-fields {
        grid-template-columns: 1fr;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .modal__content {
        width: 95%;
        margin: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .header__controls {
        width: 100%;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .content-card__actions {
        flex-direction: column;
    }
    
    .content-card__actions .btn {
        width: 100%;
    }
    
    .goal-card__actions {
        flex-direction: column;
    }
    
    .goal-card__actions .btn {
        width: 100%;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.tab-content--active {
    animation: fadeIn 0.3s ease-out;
}

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

/* Focus styles for better accessibility */
.btn:focus,
.nav__link:focus,
.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
        --shadow-hover: 0 4px 8px rgba(0, 0, 0, 0.6);
    }
    
    .btn {
        border: 2px solid currentColor;
    }
}