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

* {
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* CSS Variables */
:root {
    /* Colors */
    --primary: #2196F3;
    --success: #4CAF50;
    --warning: #FFC107;
    --danger: #F44336;
    --accent: #9C27B0;
    
    /* Dark Mode Colors */
    --bg-primary: #121212;
    --bg-secondary: #1e1e1e;
    --bg-tertiary: #2d2d2d;
    --text-primary: #ffffff;
    --text-secondary: #b3b3b3;
    --text-muted: #666666;
    --border: #333333;
    --shadow: rgba(0, 0, 0, 0.3);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* Transitions */
    --transition: 0.3s ease;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px var(--shadow);
    --shadow-md: 0 4px 8px var(--shadow);
    --shadow-lg: 0 8px 16px var(--shadow);
}

/* Light Mode */
[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --bg-tertiary: #e0e0e0;
    --text-primary: #212121;
    --text-secondary: #424242;
    --text-muted: #9e9e9e;
    --border: #e0e0e0;
    --shadow: rgba(0, 0, 0, 0.1);
}

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

/* Header */
.header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.header__content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
}

.header__logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo__icon {
    font-size: 2rem;
}

.header__nav {
    display: flex;
    align-items: center;
}

.nav__toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.nav__toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    margin: 3px 0;
    transition: var(--transition);
}

.nav__list {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.nav__link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

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

.header__actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    background: none;
    color: var(--text-primary);
}

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

.btn--primary:hover {
    background-color: color-mix(in srgb, var(--primary) 90%, black);
    transform: translateY(-1px);
}

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

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

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

.btn--accent:hover {
    background-color: color-mix(in srgb, var(--accent) 90%, black);
}

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

.btn--danger:hover {
    background-color: color-mix(in srgb, var(--danger) 90%, black);
}

.btn--icon {
    padding: var(--spacing-sm);
    min-width: 40px;
    min-height: 40px;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* Theme Toggle */
.theme-toggle {
    font-size: 1.2rem;
}

.theme-icon {
    transition: var(--transition);
}

/* Main Content */
.main {
    min-height: calc(100vh - 120px);
    padding: var(--spacing-xl) 0;
}

/* Pages */
.page {
    display: none;
    animation: fadeIn 0.3s ease;
}

.page--active {
    display: block;
}

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

.page__title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.page__subtitle {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

/* Dashboard */
.dashboard__header {
    text-align: center;
    margin-bottom: var(--spacing-xxl);
}

.dashboard__welcome {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-top: var(--spacing-sm);
}

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

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

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

.stat-card__icon {
    font-size: 2rem;
    min-width: 60px;
    text-align: center;
}

.stat-card__title {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.stat-card__value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.dashboard__chart {
    background-color: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-xxl);
    box-shadow: var(--shadow-sm);
}

.chart-container {
    position: relative;
    height: 300px;
}

.chart__title {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

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

/* Collection */
.collection__header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

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

.view-toggle {
    display: flex;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: var(--spacing-xs);
}

.view-toggle__btn {
    padding: var(--spacing-sm);
    background: none;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
}

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

.view-icon {
    font-size: 1.1rem;
}

/* Filters */
.collection__filters {
    margin-bottom: var(--spacing-xl);
}

.filters {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-md);
}

.filter-group {
    position: relative;
}

.filter__input,
.filter__select {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: var(--transition);
}

.filter__input:focus,
.filter__select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 20%, transparent);
}

/* Cards */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.cards-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.card {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
}

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

.card--owned {
    border-left: 4px solid var(--success);
}

.card--wanted {
    border-left: 4px solid var(--warning);
}

.card__image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    background-color: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 3rem;
}

.card__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-md);
}

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

.card__name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1rem;
}

.card__number {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.card__edition {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.card__meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--spacing-sm);
}

.card__rarity {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
}

.card__rarity--common {
    background-color: color-mix(in srgb, var(--text-muted) 20%, transparent);
    color: var(--text-muted);
}

.card__rarity--uncommon {
    background-color: color-mix(in srgb, var(--success) 20%, transparent);
    color: var(--success);
}

.card__rarity--rare {
    background-color: color-mix(in srgb, var(--primary) 20%, transparent);
    color: var(--primary);
}

.card__rarity--ultra-rare {
    background-color: color-mix(in srgb, var(--accent) 20%, transparent);
    color: var(--accent);
}

.card__status {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
}

.card__status--owned {
    background-color: color-mix(in srgb, var(--success) 20%, transparent);
    color: var(--success);
}

.card__status--wanted {
    background-color: color-mix(in srgb, var(--warning) 20%, transparent);
    color: var(--warning);
}

.card__value {
    font-weight: 600;
    color: var(--primary);
}

.card__actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

/* Forms */
.card-form {
    background-color: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

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

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

.form__group--full {
    grid-column: 1 / -1;
}

.form__label {
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.875rem;
}

.form__input,
.form__select {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: var(--transition);
}

.form__input:focus,
.form__select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 20%, transparent);
}

.form__suggestions {
    background-color: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    max-height: 200px;
    overflow-y: auto;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 10;
    display: none;
}

.suggestion-item {
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    transition: var(--transition);
}

.suggestion-item:hover {
    background-color: var(--bg-secondary);
}

/* File Input */
.file-input {
    position: relative;
}

.file-input__input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.file-input__label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    border: 2px dashed var(--border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    background-color: var(--bg-primary);
}

.file-input__label:hover {
    border-color: var(--primary);
    background-color: var(--bg-secondary);
}

.file-input__icon {
    font-size: 1.5rem;
}

.image-preview {
    position: relative;
    margin-top: var(--spacing-md);
}

.image-preview img {
    width: 100%;
    max-width: 200px;
    height: auto;
    border-radius: var(--radius-md);
}

.image-preview__remove {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background-color: var(--danger);
    color: white;
    border: none;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
}

.form__actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
}

/* Action Cards */
.action-card {
    background-color: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.action-card__icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.action-card__title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.action-card__description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

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

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-xxl);
    color: var(--text-secondary);
}

.empty-state__icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-lg);
}

.empty-state__title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.empty-state__message {
    margin-bottom: var(--spacing-lg);
}

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

.modal--active {
    display: flex;
}

.modal__overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
}

.modal__content {
    position: relative;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    animation: modalSlideIn 0.3s ease;
}

.modal__content--small {
    max-width: 400px;
}

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

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

.modal__title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.modal__close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

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

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

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

/* Loading */
.loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    backdrop-filter: blur(5px);
}

.loading--active {
    display: flex;
}

.loading__spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--bg-tertiary);
    border-top: 4px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-md);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading__text {
    color: white;
    font-weight: 500;
}

/* Toast */
.toast-container {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 1500;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    border-left: 4px solid var(--primary);
    min-width: 300px;
    animation: toastSlideIn 0.3s ease;
}

.toast--success {
    border-left-color: var(--success);
}

.toast--error {
    border-left-color: var(--danger);
}

.toast--warning {
    border-left-color: var(--warning);
}

@keyframes toastSlideIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

.footer__text {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .nav__toggle {
        display: flex;
    }
    
    .nav__list {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--bg-secondary);
        flex-direction: column;
        padding: var(--spacing-md);
        border-top: 1px solid var(--border);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }
    
    .nav__list--active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .page__title {
        font-size: 1.5rem;
    }
    
    .dashboard__stats {
        grid-template-columns: 1fr;
    }
    
    .collection__header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .filters {
        grid-template-columns: 1fr;
    }
    
    .cards-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }
    
    .form__grid {
        grid-template-columns: 1fr;
    }
    
    .dashboard__actions {
        flex-direction: column;
        align-items: stretch;
    }
    
    .action-card__buttons {
        flex-direction: column;
    }
    
    .modal__content {
        width: 95%;
        margin: var(--spacing-md);
    }
    
    .toast-container {
        top: var(--spacing-sm);
        right: var(--spacing-sm);
        left: var(--spacing-sm);
    }
    
    .toast {
        min-width: auto;
    }
}

@media (max-width: 480px) {
    .cards-grid {
        grid-template-columns: 1fr;
    }
    
    .stat-card {
        flex-direction: column;
        text-align: center;
    }
    
    .card__meta {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .card__actions {
        flex-direction: column;
    }
}

/* 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 keyboard navigation */
button:focus,
input:focus,
select:focus,
a:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border: #000000;
        --shadow: rgba(0, 0, 0, 0.8);
    }
    
    [data-theme="light"] {
        --border: #000000;
        --shadow: rgba(0, 0, 0, 0.3);
    }
}

/* Print styles */
@media print {
    .header,
    .footer,
    .btn,
    .modal,
    .loading,
    .toast-container {
        display: none !important;
    }
    
    .main {
        padding: 0;
    }
    
    .page {
        display: block !important;
    }
    
    .cards-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }
}