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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

/* CSS Variables */
:root {
    --primary-color: #2196F3;
    --success-color: #4CAF50;
    --warning-color: #FFC107;
    --error-color: #F44336;
    --purple-color: #9C27B0;
    --white: #ffffff;
    --light-gray: #f8f9fa;
    --gray: #6c757d;
    --dark-gray: #343a40;
    --border-radius: 12px;
    --box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
    --container-max-width: 1200px;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
}

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

/* Header */
.header {
    background: var(--white);
    box-shadow: var(--box-shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header__title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    text-align: center;
    padding: var(--spacing-lg) 0 var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.header__icon {
    font-size: 2.5rem;
    animation: bounce 2s infinite;
}

.header__subtitle {
    text-align: center;
    color: var(--gray);
    padding-bottom: var(--spacing-lg);
    font-size: 1.1rem;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

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

/* Cards */
.card {
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
}

.card__title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--dark-gray);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

/* Form Styles */
.form__group {
    margin-bottom: var(--spacing-lg);
}

.form__label {
    display: block;
    font-weight: 600;
    color: var(--dark-gray);
    margin-bottom: var(--spacing-sm);
    font-size: 0.95rem;
}

.form__input,
.form__select {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid #e9ecef;
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    background: var(--white);
}

.form__input:focus,
.form__select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.1);
}

.form__input:invalid,
.form__select:invalid {
    border-color: var(--error-color);
}

/* Interests Grid */
.interests-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.interest-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm);
    border: 2px solid #e9ecef;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    background: var(--white);
}

.interest-item:hover {
    border-color: var(--primary-color);
    background: rgba(33, 150, 243, 0.05);
}

.interest-item.selected {
    border-color: var(--primary-color);
    background: var(--primary-color);
    color: var(--white);
}

.interest-item__checkbox {
    margin-right: var(--spacing-sm);
}

.interest-item__label {
    font-size: 0.9rem;
    cursor: pointer;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    min-height: 48px;
}

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

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

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

.btn--secondary:hover {
    background: #5a6268;
    transform: translateY(-1px);
}

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

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

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

.btn--success:hover {
    background: #45a049;
}

.btn--large {
    padding: var(--spacing-lg) var(--spacing-xl);
    font-size: 1.1rem;
    width: 100%;
}

.btn__icon {
    font-size: 1.2rem;
}

/* Loading */
.loading {
    text-align: center;
    padding: var(--spacing-xxl);
}

.loading__spinner {
    width: 50px;
    height: 50px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-lg);
}

.loading__text {
    font-size: 1.1rem;
    color: var(--gray);
}

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

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

.results__title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--white);
}

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

/* Gifts Grid */
.gifts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.gift-card {
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
    transition: var(--transition);
    position: relative;
}

.gift-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
}

.gift-card__image {
    width: 100%;
    height: 200px;
    background: linear-gradient(45deg, var(--primary-color), var(--purple-color));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: var(--white);
    position: relative;
}

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

.gift-card__title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--dark-gray);
    margin-bottom: var(--spacing-sm);
}

.gift-card__description {
    color: var(--gray);
    margin-bottom: var(--spacing-md);
    line-height: 1.5;
}

.gift-card__price {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--success-color);
    margin-bottom: var(--spacing-md);
}

.gift-card__tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.gift-tag {
    background: var(--light-gray);
    color: var(--gray);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 20px;
    font-size: 0.8rem;
}

.gift-card__actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: space-between;
}

.gift-card__favorite {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    transition: var(--transition);
    padding: var(--spacing-sm);
    border-radius: 50%;
}

.gift-card__favorite:hover {
    background: rgba(244, 67, 54, 0.1);
}

.gift-card__favorite.active {
    color: var(--error-color);
}

.gift-card__refresh {
    background: var(--primary-color);
    color: var(--white);
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
}

.gift-card__refresh:hover {
    background: #1976D2;
}

/* Results Footer */
.results__footer {
    text-align: center;
}

/* Floating Action Button */
.fab {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--error-color);
    color: var(--white);
    border: none;
    box-shadow: var(--box-shadow);
    cursor: pointer;
    transition: var(--transition);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.fab:hover {
    transform: scale(1.1);
    box-shadow: 0 8px 30px rgba(244, 67, 54, 0.3);
}

.fab__icon {
    font-size: 1.5rem;
}

.fab__count {
    position: absolute;
    top: -5px;
    right: -5px;
    background: var(--white);
    color: var(--error-color);
    font-size: 0.8rem;
    font-weight: 700;
    min-width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--error-color);
}

/* Favorites */
.favorites {
    margin-top: var(--spacing-xl);
}

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

.favorite-item {
    background: var(--light-gray);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.favorite-item__info {
    flex: 1;
}

.favorite-item__title {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.favorite-item__price {
    color: var(--success-color);
    font-size: 0.9rem;
}

.favorite-item__remove {
    background: var(--error-color);
    color: var(--white);
    border: none;
    padding: var(--spacing-sm);
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
}

.favorite-item__remove:hover {
    background: #d32f2f;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.modal__content {
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    width: 90%;
    max-width: 500px;
    position: relative;
    z-index: 1;
    max-height: 90vh;
    overflow-y: auto;
}

.modal__header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid #e9ecef;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal__title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--dark-gray);
}

.modal__close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--gray);
    transition: var(--transition);
}

.modal__close:hover {
    color: var(--dark-gray);
}

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

.export-options {
    display: flex;
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
    flex-wrap: wrap;
}

.export-result {
    background: var(--light-gray);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin-top: var(--spacing-lg);
}

.export-result__link {
    word-break: break-all;
    color: var(--primary-color);
    text-decoration: none;
}

.export-result__link:hover {
    text-decoration: underline;
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 3000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    min-width: 300px;
    animation: slideInRight 0.3s ease;
    border-left: 4px solid var(--success-color);
}

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

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

.toast__icon {
    font-size: 1.2rem;
}

.toast__message {
    flex: 1;
}

.toast__close {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    color: var(--gray);
}

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

/* Footer */
.footer {
    background: var(--dark-gray);
    color: var(--white);
    text-align: center;
    padding: var(--spacing-lg) 0;
    margin-top: var(--spacing-xxl);
}

.footer__text {
    font-size: 0.9rem;
}

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

.footer__link:hover {
    text-decoration: underline;
    color: #64B5F6;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .header__title {
        font-size: 1.5rem;
        flex-direction: column;
        gap: var(--spacing-xs);
    }
    
    .header__icon {
        font-size: 2rem;
    }
    
    .header__subtitle {
        font-size: 1rem;
    }
    
    .card {
        padding: var(--spacing-lg);
    }
    
    .results__header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .results__actions {
        justify-content: center;
    }
    
    .gifts-grid {
        grid-template-columns: 1fr;
    }
    
    .interests-grid {
        grid-template-columns: 1fr;
    }
    
    .export-options {
        flex-direction: column;
    }
    
    .fab {
        bottom: var(--spacing-md);
        right: var(--spacing-md);
        width: 50px;
        height: 50px;
    }
    
    .fab__icon {
        font-size: 1.2rem;
    }
    
    .toast-container {
        top: var(--spacing-sm);
        right: var(--spacing-sm);
        left: var(--spacing-sm);
    }
    
    .toast {
        min-width: auto;
    }
    
    .modal__content {
        width: 95%;
        margin: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .gift-card__actions {
        flex-direction: column;
    }
    
    .favorite-item {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
    
    .btn {
        font-size: 0.9rem;
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .btn--large {
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: 1rem;
    }
}

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

/* Focus styles for accessibility */
.btn:focus,
.form__input:focus,
.form__select:focus,
.interest-item:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .card {
        border: 1px solid var(--dark-gray);
    }
    
    .btn {
        border: 1px solid currentColor;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --white: #1a1a1a;
        --light-gray: #2d2d2d;
        --gray: #b0b0b0;
        --dark-gray: #ffffff;
    }
    
    body {
        background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
        color: var(--dark-gray);
    }
    
    .header {
        background: var(--white);
        border-bottom: 1px solid #444;
    }
    
    .form__input,
    .form__select {
        background: var(--light-gray);
        border-color: #444;
        color: var(--dark-gray);
    }
    
    .interest-item {
        background: var(--light-gray);
        border-color: #444;
    }
}