:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --accent: #38bdf8;
    --accent-hover: #0ea5e9;
    --border: #475569;
    --font-main: 'Inter', sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    font-family: var(--font-main);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
a { text-decoration: none; color: inherit; transition: color 0.3s ease; }
ul { list-style: none; }

h1, h2, h3 { font-weight: 700; line-height: 1.2; }
.section-title { font-size: 2.5rem; text-align: center; margin-bottom: 1rem; }
.section-subtitle { font-size: 1.1rem; text-align: center; color: var(--text-secondary); margin-bottom: 3rem; max-width: 600px; margin-inline: auto; }

.btn-primary, .btn-secondary {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 12px 24px; border-radius: 8px; font-weight: 600;
    transition: all 0.3s ease; cursor: pointer; border: none;
}
.btn-primary { background-color: var(--accent); color: var(--bg-primary); }
.btn-primary:hover { background-color: var(--accent-hover); transform: translateY(-2px); }
.btn-secondary { background-color: transparent; border: 2px solid var(--accent); color: var(--accent); }
.btn-secondary:hover { background-color: var(--accent); color: var(--bg-primary); }
.btn-large { padding: 16px 32px; font-size: 1.1rem; }

.navbar {
    position: fixed; top: 0; width: 100%;
    background-color: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(10px); z-index: 1000;
    border-bottom: 1px solid var(--border); padding: 1rem 0;
}
.navbar .container { display: flex; justify-content: space-between; align-items: center; }
.logo { font-size: 1.5rem; font-weight: 700; }
.logo .highlight { color: var(--accent); }
.nav-links { display: flex; gap: 2rem; align-items: center; }
.nav-links a { font-weight: 500; color: var(--text-secondary); }
.nav-links a:hover { color: var(--accent); }

.burger { display: none; cursor: pointer; }
.burger div { width: 25px; height: 3px; background-color: var(--text-primary); margin: 5px; transition: all 0.3s ease; }

.hero {
    min-height: 100vh; display: flex; align-items: center; justify-content: center;
    text-align: center; padding-top: 80px;
    background: radial-gradient(circle at top right, rgba(56, 189, 248, 0.1), transparent 40%);
}
.greeting { color: var(--accent); font-size: 1.2rem; font-weight: 600; margin-bottom: 1rem; }
.hero h1 {
    font-size: 4rem; margin-bottom: 0.5rem;
    background: linear-gradient(to right, #f8fafc, #38bdf8);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.hero h2 { font-size: 1.5rem; color: var(--text-secondary); font-weight: 400; margin-bottom: 1.5rem; }
.hero-desc { font-size: 1.1rem; color: var(--text-secondary); max-width: 600px; margin: 0 auto 2rem; }
.hero-buttons { display: flex; gap: 1rem; justify-content: center; margin-bottom: 2rem; flex-wrap: wrap; }
.tech-badges { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.tech-badges span {
    background-color: var(--bg-secondary); border: 1px solid var(--border);
    padding: 6px 12px; border-radius: 20px; font-size: 0.9rem; color: var(--text-secondary);
}

.section { padding: 5rem 0; }
.bg-alt { background-color: var(--bg-secondary); }

.tech-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1.5rem; }
.tech-card {
    background-color: var(--bg-card); padding: 2rem; border-radius: 12px;
    border: 1px solid var(--border); transition: transform 0.3s ease, border-color 0.3s ease;
    text-align: center;
}
.tech-card:hover { transform: translateY(-5px); border-color: var(--accent); }
.tech-card i { font-size: 2.5rem; color: var(--accent); margin-bottom: 1rem; }
.tech-card h3 { margin-bottom: 0.5rem; font-size: 1.2rem; }
.tech-card p { color: var(--text-secondary); font-size: 0.95rem; }

/* --- Стили для 3D Визуализации --- */
.visuals-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    perspective: 1000px; /* Включает 3D-пространство */
}

.visual-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.5rem;
    transform-style: preserve-3d; /* Сохраняет 3D для дочерних элементов */
    transition: transform 0.1s ease-out; /* Плавность для JS-анимации наклона */
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

/* Эффект свечения, следующего за курсором */
.visual-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: radial-gradient(circle at var(--mouse-x, 50%) var(--mouse-y, 50%), rgba(56, 189, 248, 0.15), transparent 60%);
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
    z-index: 1;
}
.visual-card:hover::before { opacity: 1; }

.visual-content {
    transform: translateZ(40px); /* Выдвигаем контент вперед для эффекта глубины */
    position: relative;
    z-index: 2;
}

.visual-card h3 {
    display: flex; align-items: center; gap: 10px;
    font-size: 1.2rem; margin-bottom: 1rem; color: var(--accent);
}

.visual-card canvas {
    width: 100%;
    height: 160px;
    background: rgba(15, 23, 42, 0.6);
    border-radius: 8px;
    margin-bottom: 1rem;
    border: 1px solid var(--border);
    display: block;
}

.visual-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
}

.timeline { position: relative; max-width: 800px; margin: 0 auto; }
.timeline::before {
    content: ''; position: absolute; left: 20px; top: 0; bottom: 0;
    width: 2px; background-color: var(--border);
}
.timeline-item { display: flex; gap: 2rem; margin-bottom: 2rem; position: relative; }
.timeline-number {
    flex-shrink: 0; width: 40px; height: 40px; background-color: var(--accent);
    color: var(--bg-primary); border-radius: 50%; display: flex;
    align-items: center; justify-content: center; font-weight: 700; z-index: 1;
}
.timeline-content {
    background-color: var(--bg-card); padding: 1.5rem; border-radius: 12px;
    border: 1px solid var(--border); flex-grow: 1;
}
.timeline-content h3 { margin-bottom: 0.5rem; color: var(--accent); }
.timeline-content p { color: var(--text-secondary); }

.projects-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1.5rem; }
.project-card {
    background-color: var(--bg-primary); border: 1px solid var(--border);
    border-radius: 12px; padding: 1.5rem; transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex; flex-direction: column;
}
.project-card:hover { transform: translateY(-5px); box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3); border-color: var(--accent); }
.project-header { display: flex; align-items: center; gap: 1rem; margin-bottom: 1rem; }
.project-header i { font-size: 1.5rem; color: var(--accent); }
.project-header h3 { font-size: 1.1rem; }
.project-card p { color: var(--text-secondary); font-size: 0.95rem; margin-bottom: 1.5rem; flex-grow: 1; }
.project-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.project-tags span {
    background-color: rgba(56, 189, 248, 0.1); color: var(--accent);
    padding: 4px 10px; border-radius: 6px; font-size: 0.8rem; font-weight: 600;
}

.contact-container { text-align: center; }
.contact-links { margin-top: 2rem; }
.contact-link { color: var(--text-secondary); font-size: 1.1rem; display: inline-flex; align-items: center; gap: 8px; }
.contact-link:hover { color: var(--accent); }

footer {
    background-color: var(--bg-primary); border-top: 1px solid var(--border);
    padding: 2rem 0; text-align: center; color: var(--text-secondary); font-size: 0.9rem;
}
.footer-tech { margin-top: 1rem; font-size: 0.8rem; opacity: 0.7; line-height: 1.4; }

.fade-in { opacity: 0; transform: translateY(20px); transition: opacity 0.6s ease-out, transform 0.6s ease-out; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

@media (max-width: 768px) {
    .nav-links {
        position: absolute; right: 0; top: 70px; background-color: var(--bg-secondary);
        flex-direction: column; width: 100%; padding: 2rem 0;
        transform: translateX(100%); transition: transform 0.3s ease-in-out;
        border-bottom: 1px solid var(--border);
    }
    .nav-links.active { transform: translateX(0); }
    .burger { display: block; }
    .burger.toggle .line1 { transform: rotate(-45deg) translate(-5px, 6px); }
    .burger.toggle .line2 { opacity: 0; }
    .burger.toggle .line3 { transform: rotate(45deg) translate(-5px, -6px); }
    .hero h1 { font-size: 2.5rem; }
    .hero h2 { font-size: 1.2rem; }
    .section-title { font-size: 2rem; }
    .timeline::before { left: 19px; }
}