:root {
    --color-dark: #0a0e1a;
    --color-darker: #050709;
    --color-accent: #ffd700;
    --color-accent-light: #ffe44d;
    --color-text: #e8e8e8;
    --color-text-light: #b0b0b0;
    --color-success: #2ecc71;
    --color-card-bg: #1a1f2e;
    --color-border: #2d3547;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 5rem;
    --transition-default: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font-family);
    background-color: var(--color-dark);
    color: var(--color-text);
    font-size: 16px;
    line-height: 1.6;
    overflow-x: hidden;
}
@keyframes slideInUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeInScale { from { opacity: 0; scale: 0.9; } to { opacity: 1; scale: 1; } }
@keyframes shimmer { 0%, 100% { background-position: 200% center; } 50% { background-position: -200% center; } }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.7; } }
@keyframes bounce { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
.education-card { animation: slideInUp 0.6s ease-out; }
img { transition: all 0.3s ease; }
img:hover { transform: scale(1.05); filter: brightness(1.1); }
.lazy-loading { background: linear-gradient(90deg, rgba(200, 200, 200, 0.2) 0%, rgba(200, 200, 200, 0.3) 50%, rgba(200, 200, 200, 0.2) 100%); background-size: 200% 100%; animation: shimmer 2s infinite; }
a { color: var(--color-accent); text-decoration: none; transition: var(--transition-default); }
a:hover { color: var(--color-accent-light); }
h1, h2, h3, h4 { font-weight: 700; line-height: 1.2; margin-bottom: var(--spacing-md); }
h1 { font-size: 3.5rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 1.8rem; }
p { margin-bottom: var(--spacing-md); color: var(--color-text-light); }
.container { max-width: 1400px; margin: 0 auto; padding: 0 var(--spacing-lg); }
.section { padding: var(--spacing-xl) 0; }
header {
    background-color: rgba(10, 14, 26, 0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--color-border);
}
.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
}
.logo { font-size: 1.8rem; font-weight: 700; color: var(--color-accent); letter-spacing: 2px; }
nav ul { display: flex; list-style: none; gap: var(--spacing-lg); }
nav a { color: var(--color-text-light); font-weight: 500; }
nav a:hover { color: var(--color-accent); }
main { margin-top: 80px; }
.hero {
    background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-darker) 100%);
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
}
.hero-content { position: relative; z-index: 2; max-width: 700px; opacity: 1; }
.hero h1 { color: var(--color-accent); font-size: 4.5rem; }
.hero p { font-size: 1.3rem; }
.hero-image {
    position: absolute;
    right: 50px;
    top: 50%;
    transform: translateY(-50%);
    width: 400px;
    opacity: 0.7;
}
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: 50px;
    font-weight: 600;
    text-align: center;
    transition: var(--transition-default);
    text-transform: uppercase;
    letter-spacing: 1px;
}
.btn-primary { background-color: var(--color-accent); color: var(--color-dark); }
.btn-primary:hover { background-color: var(--color-accent-light); transform: translateY(-3px); }
.btn-secondary { background-color: transparent; color: var(--color-accent); border: 2px solid var(--color-accent); }
.btn-secondary:hover { background-color: var(--color-accent); color: var(--color-dark); }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: var(--spacing-lg); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--spacing-lg); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--spacing-md); }
.card {
    background-color: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: 15px;
    padding: var(--spacing-lg);
    transition: var(--transition-default);
}
.card:hover { border-color: var(--color-accent); transform: translateY(-5px); }
.card h3 { color: var(--color-accent); }
.section-title { text-align: center; margin-bottom: var(--spacing-xl); }
.section-title h2 { color: var(--color-accent); }
footer {
    background-color: var(--color-darker);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-lg) 0;
}
.footer-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--spacing-lg); }
.footer-section h4 { color: var(--color-accent); }
.footer-section ul { list-style: none; }
.footer-bottom { text-align: center; padding-top: var(--spacing-lg); border-top: 1px solid var(--color-border); }
@media (max-width: 768px) {
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    nav ul { flex-direction: column; }
    .hero-image { display: none; }
    h1 { font-size: 2rem; }
}