:root {
    --bg-primary: #ffffff;
    --bg-alt: #f8f9fa;
    --text-main: #1a1a1a;
    --text-secondary: #636363;
    --accent: #2563eb;
    --card-bg: #ffffff;
    --nav-blur: rgba(255, 255, 255, 0.8);
}

[data-theme="dark"] {
    --bg-primary: #0a0c10;
    --bg-alt: #12151a;
    --text-main: #f0f6fc;
    --text-secondary: #8b949e;
    --accent: #58a6ff;
    --card-bg: #161b22;
    --nav-blur: rgba(10, 12, 16, 0.8);
}

body {
    background-color: var(--bg-primary);
    color: var(--text-main);
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    transition: background-color 0.4s ease;
}

/* UI Components */
.section-padding { padding: 80px 0; }
.bg-alt { background-color: var(--bg-alt); }

.navbar {
    background-color: var(--nav-blur) !important;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

.hero-section {
    min-height: 80vh;
    display: flex;
    align-items: center;
    background: radial-gradient(circle at 10% 20%, rgba(37, 99, 235, 0.05) 0%, transparent 40%);
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    font-weight: 800;
    letter-spacing: -1px;
}

.section-title {
    font-weight: 700;
    margin-bottom: 3rem;
    text-align: center;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 40px;
    height: 3px;
    background: var(--accent);
    margin: 10px auto;
}

/* Cards & Tags */
.education-card {
    background-color: var(--card-bg);
    border-radius: 16px;
    transition: transform 0.3s ease;
}

.skill-category-card {
    padding: 2rem;
    background: var(--card-bg);
    border-radius: 12px;
    height: 100%;
    border: 1px solid rgba(0,0,0,0.05);
}

.skill-tag {
    background: var(--bg-alt);
    color: var(--text-main);
    padding: 6px 14px;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 500;
    border: 1px solid rgba(0,0,0,0.05);
}

.theme-toggle {
    background: none;
    border: 1px solid rgba(0,0,0,0.1);
    color: var(--text-main);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

.social-links a {
    color: var(--text-main);
    font-size: 1.4rem;
    margin: 0 15px;
    opacity: 0.7;
    transition: 0.3s;
}

.social-links a:hover { opacity: 1; color: var(--accent); }

@media (max-width: 768px) {
    .section-padding { padding: 50px 0; }
}