:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-card: #ffffff;
    --border-color: #e5e7eb;
    --shadow: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
    --radius: 8px;
    --radius-lg: 12px;
    --transition: all 0.3s ease;
}

[data-theme="dark"] {
    --primary-color: #3b82f6;
    --primary-dark: #60a5fa;
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --bg-primary: #111827;
    --bg-secondary: #1f2937;
    --bg-card: #1f2937;
    --border-color: #374151;
    --shadow: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.3);
}

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

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: var(--transition);
}

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

/* Header */
header {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-lg);
    margin: 20px auto;
    box-shadow: var(--shadow-lg);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
}

.header-content {
    position: relative;
    z-index: 1;
    padding: 40px;
    border-radius: var(--radius-lg);
}

.header-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 40px;
}

.header-info {
    flex: 1;
    min-width: 300px;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 15px;
    color: white;
}

.header-description {
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.8;
}

.header-description p {
    margin-bottom: 10px;
}

/* Tabs */
.tabs-container {
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    margin: 40px 0;
    overflow: hidden;
}

.tabs-header {
    padding: 25px 30px;
    border-bottom: 1px solid var(--border-color);
}

.tabs-header h2 {
    font-size: 1.8rem;
    font-weight: 600;
}

.tabs-nav {
    display: flex;
    overflow-x: auto;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.tab-btn {
    padding: 18px 30px;
    background: none;
    border: none;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.tab-btn:hover {
    color: var(--primary-color);
    background-color: rgba(37, 99, 235, 0.05);
}

.tab-btn.active {
    color: var(--primary-color);
    background-color: var(--bg-card);
    border-bottom: 2px solid var(--primary-color);
}

.tab-content {
    display: none;
    padding: 30px;
}

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

.tab-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.tab-subtitle {
    font-size: 1.2rem;
    font-weight: 500;
    margin: 20px 0 10px;
    color: var(--text-secondary);
}

.tab-additional {
    color: var(--text-secondary);
    margin-bottom: 15px;
    font-style: italic;
}

.tab-text {
    color: var(--text-primary);
    line-height: 1.7;
    margin-bottom: 20px;
}

.tab-text p {
    margin-bottom: 15px;
}

details {
    margin: 20px 0;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    overflow: hidden;
}

summary {
    padding: 15px;
    background-color: var(--bg-secondary);
    cursor: pointer;
    font-weight: 500;
}

details[open] summary {
    border-bottom: 1px solid var(--border-color);
}

.details-content {
    padding: 15px;
    background-color: var(--bg-card);
}

.tab-links {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    margin-top: 25px;
}

.link-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: var(--radius);
    font-weight: 500;
    transition: var(--transition);
}

.link-btn:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.link-btn.outlined {
    background-color: transparent;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
}

.link-btn.outlined:hover {
    background-color: rgba(37, 99, 235, 0.1);
}

/* Slider */
.slider-container {
    margin: 60px 0;
}

.slider-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    flex-wrap: wrap;
    gap: 20px;
}

.slider-header h2 {
    font-size: 1.8rem;
    font-weight: 600;
}

.slider-anchor {
    color: var(--text-secondary);
    font-weight: 500;
}

.slider {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-lg);
}

.slider-track {
    display: flex;
    transition: transform 0.5s ease;
}

.slider-slide {
    min-width: 100%;
    padding: 0 10px;
}

@media (min-width: 768px) {
    .slider-slide {
        min-width: 50%;
    }
}

@media (min-width: 1024px) {
    .slider-slide {
        min-width: 33.333%;
    }
}

.skill-card {
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 25px;
    height: 100%;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.skill-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.skill-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.skill-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

.slider-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 30px;
    margin-top: 30px;
}

.slider-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: none;
    background-color: var(--primary-color);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: var(--transition);
}

.slider-btn:hover {
    background-color: var(--primary-dark);
    transform: scale(1.1);
}

.slider-dots {
    display: flex;
    gap: 10px;
}

.slider-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--border-color);
    cursor: pointer;
    transition: var(--transition);
}

.slider-dot.active {
    background-color: var(--primary-color);
}

/* Card Layout */
.card-layout {
    margin: 60px 0;
}

.card-layout h2 {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 30px;
    text-align: center;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 30px;
}

.hobby-card {
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    padding: 25px;
}

.hobby-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.hobby-content h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.hobby-content p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Content Layout */
.content-layout {
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 40px;
    margin: 60px 0;
    box-shadow: var(--shadow);
}

.content-header h2 {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.content-header p {
    color: var(--text-secondary);
    margin-bottom: 25px;
    line-height: 1.7;
}

.content-additional {
    color: var(--text-secondary);
    font-style: italic;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.file-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.file-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px 20px;
    background-color: var(--bg-secondary);
    border-radius: var(--radius);
    transition: var(--transition);
}

.file-item:hover {
    background-color: rgba(37, 99, 235, 0.1);
}

.file-icon {
    color: var(--primary-color);
    font-size: 1.5rem;
}

.file-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    flex-grow: 1;
}

.file-link:hover {
    color: var(--primary-color);
}

.file-download {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 5px;
}

/* Icons Block */
.icons-block {
    margin: 60px 0;
    text-align: center;
}

.icons-block h2 {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 30px;
    color: var(--text-primary);
}

.icons-container {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 40px;
}

.icon-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-primary);
    transition: var(--transition);
    width: 100px;
}

.icon-item:hover {
    color: var(--primary-color);
    transform: translateY(-5px);
}

.icon-img {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    object-fit: cover;
    background-color: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.icon-text {
    font-weight: 500;
}

/* Material Cards */
.material-card {
    background-color: var(--bg-card);
    border-radius: var(--radius);
    padding: 25px;
    display: flex;
    align-items: center;
    gap: 20px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    height: 100%;
    text-decoration: none;
    color: var(--text-primary);
}

.material-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.material-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius);
    background-color: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.material-content {
    flex-grow: 1;
}

.material-text {
    display: block;
    margin-bottom: 10px;
    font-weight: 500;
}

.material-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Theme toggle */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 100;
}

.theme-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: none;
    background-color: var(--primary-color);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.theme-btn:hover {
    background-color: var(--primary-dark);
    transform: rotate(30deg);
}

/* Footer */
footer {
    text-align: center;
    padding: 30px 0;
    margin-top: 60px;
    color: var(--text-secondary);
    border-top: 1px solid var(--border-color);
}

/* Responsive */
@media (max-width: 768px) {
    .header-content {
        padding: 25px;
    }
    
    .header-row {
        gap: 20px;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .tabs-header, .tab-content, .content-layout {
        padding: 20px;
    }
    
    .tab-btn {
        padding: 15px 20px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .header-content {
        padding: 20px;
    }
    
    .cards-grid {
        grid-template-columns: 1fr;
    }
    
    .tab-links {
        flex-direction: column;
    }
    
    .link-btn {
        justify-content: center;
    }
}

/* Print styles */
@media print {
    .theme-toggle, .slider-btn, .slider-dots {
        display: none !important;
    }
    
    .skill-card, .hobby-card, .material-card {
        break-inside: avoid;
    }
    
    .header-content {
        background: #2563eb !important;
    }
}

@media (min-width: 768px) {
    /* 4 блока: 2 строки, 2 столбца */
    .cards-grid[data-count="4"] {
        grid-template-columns: repeat(2, 1fr);
    }

    /* 5 блоков: 3 столбца (в первой строке 3, во второй 2) */
    .cards-grid[data-count="5"] {
        grid-template-columns: repeat(3, 1fr);
    }

    /* 6 блоков: 3 столбца (2 строки по 3 блока) */
    .cards-grid[data-count="6"] {
        grid-template-columns: repeat(3, 1fr);
    }
}