:root {
    --primary: #0f1419;
    --secondary: #1a1f2e;
    --tertiary: #252b3b;
    --accent: #3b82f6;
    --accent-light: #60a5fa;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border: #334155;
    --success: #10b981;
    --gradient-primary: linear-gradient(135deg, #3b82f6 0%, #1e40af 100%);
}

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

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

.serif {
    font-family: 'Playfair Display', serif;
}

nav {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(15, 20, 25, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    padding: 1.5rem 0;
}

nav .container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 3rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

nav .logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

nav .logo span {
    color: var(--accent);
}

nav ul {
    display: flex;
    gap: 2.5rem;
    list-style: none;
}

nav a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s;
    font-size: 0.95rem;
    font-weight: 500;
}

nav a:hover, nav a.active {
    color: var(--text-primary);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 3rem;
}

.page-hero {
    padding: 10rem 0 4rem;
    text-align: center;
}

.page-hero h1 {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
}

.about-content {
    padding: 4rem 0 6rem;
}

.about-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
}

.about-main h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.about-main h3 {
    font-size: 1.75rem;
    margin: 2.5rem 0 1rem;
}

.about-main p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.expertise-list, .cert-list {
    list-style: none;
    color: var(--text-secondary);
}

.expertise-list li, .cert-list li {
    padding-left: 1.5rem;
    position: relative;
    margin-bottom: 0.75rem;
}

.expertise-list li::before, .cert-list li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--accent);
}

.profile-card, .contact-card {
    background: var(--secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 2rem;
}

.profile-image {
    width: 100%;
    border-radius: 12px;
    margin-bottom: 1.5rem;
}

.profile-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.profile-card .title {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    text-align: center;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-light);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.contact-card h4 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.contact-card p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.contact-card a {
    color: var(--accent);
    text-decoration: none;
}

.contact-card a:hover {
    text-decoration: underline;
}

.btn {
    padding: 1rem 2rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    display: inline-block;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.3);
}

footer {
    background: var(--secondary);
    border-top: 1px solid var(--border);
    padding: 3rem 0;
    text-align: center;
    color: var(--text-muted);
}

@media (max-width: 968px) {
    .about-grid {
        grid-template-columns: 1fr;
    }

    .page-hero h1 {
        font-size: 2.5rem;
    }
}