/* Основные переменные и темы */
:root {
    /* Светлая тема (по умолчанию) */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --accent-light: #dbeafe;
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --card-shadow-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --tag-bg: #eff6ff;
    --tag-text: #1d4ed8;
    --border-color: #e2e8f0;
    --gradient-start: #3b82f6;
    --gradient-end: #8b5cf6;
    --header-bg: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 50%, #6366f1 100%);
    --header-text: #ffffff;
    --footer-bg: #0f172a;
    --footer-text: #f1f5f9;
    --success-color: #10b981;
    --warning-color: #f59e0b;
}

/* Темная тема */
.dark-theme {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --accent-color: #60a5fa;
    --accent-hover: #3b82f6;
    --accent-light: #1e3a5f;
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
    --card-shadow-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
    --tag-bg: #1e3a5f;
    --tag-text: #93c5fd;
    --border-color: #334155;
    --gradient-start: #3b82f6;
    --gradient-end: #8b5cf6;
    --header-bg: linear-gradient(135deg, #0f172a 0%, #1e3a8a 50%, #312e81 100%);
    --header-text: #ffffff;
    --footer-bg: #020617;
    --footer-text: #e2e8f0;
}

/* Сброс стилей */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: background-color 0.4s ease, color 0.4s ease;
    min-height: 100vh;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

/* Контейнеры и общие элементы */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    border-radius: 0.75rem;
    font-weight: 600;
    font-size: 0.9375rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    border: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s ease;
}

.btn:hover::before {
    left: 100%;
}

.primary-btn {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.5);
    color: white;
}

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

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

/* Заголовки */
.section-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 2.5rem;
    position: relative;
    color: var(--text-primary);
    display: inline-block;
}

.section-title::after {
    content: "";
    position: absolute;
    bottom: -0.75rem;
    left: 0;
    width: 4rem;
    height: 4px;
    background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
    border-radius: 2px;
}

/* Шапка сайта */
.site-header {
    background: var(--header-bg);
    color: var(--header-text);
    padding: 3.5rem 0 2rem;
    position: relative;
    overflow: hidden;
}

.site-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}

.header-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 2rem;
    position: relative;
    z-index: 1;
}

.site-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.site-subtitle {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 400;
    letter-spacing: 0.02em;
}

.theme-toggle {
    position: absolute;
    right: 0;
    top: 0;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--header-text);
    font-size: 1.125rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.75rem;
    height: 2.75rem;
    border-radius: 0.75rem;
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    background-color: rgba(255, 255, 255, 0.25);
    transform: scale(1.05);
}

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

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

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

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

/* Навигация */
.categories-nav {
    position: relative;
    z-index: 1;
}

.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.625rem;
}

.filter-btn {
    background-color: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 0.625rem 1.25rem;
    border-radius: 2rem;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.filter-btn:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.filter-btn.active {
    background-color: white;
    color: var(--accent-hover);
    font-weight: 600;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
}

/* Основной контент */
.site-main {
    padding: 4rem 0;
}

/* Сетка проектов */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
}

.featured-grid {
    grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
    margin-bottom: 3rem;
}

/* Карточка проекта */
.project-card {
    background-color: var(--bg-card);
    border-radius: 1.25rem;
    overflow: hidden;
    box-shadow: var(--card-shadow);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    height: 100%;
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border-color);
    position: relative;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--card-shadow-hover);
}

.project-card:hover::before {
    opacity: 1;
}

.card-thumb {
    position: relative;
    padding-top: 56.25%; /* 16:9 */
    background: linear-gradient(135deg, var(--bg-secondary), var(--border-color));
    overflow: hidden;
}

.card-thumb img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.project-card:hover .card-thumb img {
    transform: scale(1.08);
}

.card-content {
    padding: 1.75rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
    line-height: 1.4;
}

.card-description {
    font-size: 0.9375rem;
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    flex-grow: 1;
    line-height: 1.6;
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: auto;
}

.card-tag {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.375rem 0.75rem;
    border-radius: 2rem;
    background-color: var(--tag-bg);
    color: var(--tag-text);
    transition: all 0.2s ease;
}

.card-tag:hover {
    background-color: var(--accent-color);
    color: white;
}

/* Секция избранных проектов */
.featured-projects {
    margin-bottom: 4rem;
}

.all-projects {
    margin-bottom: 2rem;
}

/* Модальное окно проекта */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.modal.active {
    display: block;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal.active .modal-overlay {
    opacity: 1;
}

.modal-container {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    width: 95%;
    max-width: 1000px;
    max-height: 90vh;
    background-color: var(--bg-card);
    border-radius: 1.5rem;
    overflow: hidden;
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.4);
    display: flex;
    flex-direction: column;
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid var(--border-color);
}

.modal.active .modal-container {
    transform: translate(-50%, -50%) scale(1);
    opacity: 1;
}

.modal-header {
    padding: 1.5rem 2rem;
    background: var(--header-bg);
    color: white;
    position: relative;
}

.modal-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0;
    padding-right: 3rem;
}

.modal-close {
    position: absolute;
    right: 1.5rem;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.15);
    border: none;
    color: white;
    font-size: 1.125rem;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.modal-close:hover {
    background-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-50%) scale(1.1);
}

.modal-body {
    padding: 0;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    max-height: calc(90vh - 5rem);
}

.modal-gallery {
    position: relative;
    background: var(--bg-secondary);
}

.modal-image-container {
    position: relative;
    background: linear-gradient(135deg, var(--bg-secondary), var(--border-color));
    height: 45vh;
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-image {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    transition: opacity 0.3s ease;
}

.gallery-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
    background-color: rgba(0, 0, 0, 0.6);
    color: white;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
    backdrop-filter: blur(4px);
}

.gallery-nav:hover {
    background-color: var(--accent-color);
    transform: translateY(-50%) scale(1.1);
}

.prev-btn {
    left: 1rem;
}

.next-btn {
    right: 1rem;
}

.gallery-dots {
    display: flex;
    justify-content: center;
    padding: 1rem 0;
    gap: 0.5rem;
    background: var(--bg-card);
}

.gallery-dot {
    width: 0.625rem;
    height: 0.625rem;
    border-radius: 50%;
    background-color: var(--border-color);
    cursor: pointer;
    transition: all 0.3s ease;
}

.gallery-dot:hover {
    background-color: var(--text-secondary);
}

.gallery-dot.active {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    width: 1.5rem;
    border-radius: 0.5rem;
}

.modal-info {
    padding: 2rem;
}

.modal-description {
    margin-bottom: 2rem;
    color: var(--text-primary);
    white-space: pre-line;
    font-size: 1rem;
    line-height: 1.7;
}

.modal-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    margin-bottom: 2rem;
}

.modal-meta h3 {
    font-size: 0.875rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.tags-container {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.modal-tag {
    font-size: 0.8125rem;
    font-weight: 500;
    padding: 0.375rem 0.875rem;
    border-radius: 2rem;
    background-color: var(--tag-bg);
    color: var(--tag-text);
    transition: all 0.2s ease;
}

.modal-tag:hover {
    background-color: var(--accent-color);
    color: white;
}

.modal-actions {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.modal-actions .btn {
    flex: 1;
    max-width: 250px;
}

/* Подвал сайта */
.site-footer {
    background-color: var(--footer-bg);
    color: var(--footer-text);
    padding: 2.5rem 0;
    margin-top: 2rem;
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.copyright {
    font-size: 0.9375rem;
    color: var(--text-secondary);
}

.social-links {
    display: flex;
    gap: 0.75rem;
}

.social-links a {
    color: var(--footer-text);
    font-size: 1.25rem;
    width: 2.75rem;
    height: 2.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 0.75rem;
    transition: all 0.3s ease;
}

.social-links a:hover {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    transform: translateY(-3px);
    color: white;
}

/* Placeholder изображения */
.placeholder-image {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    width: 100%;
    position: absolute;
    top: 0;
    left: 0;
    color: var(--text-secondary);
    font-size: 3.5rem;
    background: linear-gradient(135deg, var(--bg-secondary), var(--border-color));
}

/* Медиа-запросы для адаптивности */
@media (max-width: 1024px) {
    .featured-grid {
        grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    }
}

@media (max-width: 768px) {
    .site-title {
        font-size: 2.25rem;
    }

    .site-subtitle {
        font-size: 1rem;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .site-header {
        padding: 2.5rem 0 1.5rem;
    }

    .site-main {
        padding: 2.5rem 0;
    }

    .projects-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .featured-grid {
        grid-template-columns: 1fr;
    }

    .modal-container {
        width: 100%;
        height: 100%;
        max-height: 100vh;
        border-radius: 0;
    }

    .modal-image-container {
        height: 35vh;
        min-height: 200px;
    }

    .modal-actions {
        flex-direction: column;
    }

    .modal-actions .btn {
        max-width: 100%;
    }

    .filter-buttons {
        flex-wrap: nowrap;
        overflow-x: auto;
        justify-content: flex-start;
        padding-bottom: 0.5rem;
        -webkit-overflow-scrolling: touch;
    }

    .filter-btn {
        flex-shrink: 0;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .theme-toggle {
        position: relative;
        margin-top: 1rem;
    }

    .header-content {
        padding-top: 0;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    .site-title {
        font-size: 1.75rem;
    }

    .card-content {
        padding: 1.25rem;
    }

    .modal-info {
        padding: 1.5rem;
    }

    .modal-header {
        padding: 1.25rem 1.5rem;
    }

    .modal-title {
        font-size: 1.25rem;
    }
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--text-secondary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-color);
}

/* Selection styling */
::selection {
    background: var(--accent-color);
    color: white;
}