:root {
    --primary-color: #0A66C2;
    --primary-dark: #004182;
    --text-color: #333333;
    --bg-color: #ffffff;
    --bg-light: #f4f6f8;
    --border-color: #e0e0e0;
}

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

body {
    font-family: 'Inter', sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto;
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.6;
}

.container {
    width: 90%;
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 1rem 0;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--primary-color);
}

nav {
    display: flex;
    gap: 20px;
}

nav a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.2s;
}

nav a:hover {
    color: var(--primary-color);
}

.lang-switch {
    display: flex;
    gap: 5px;
}

.lang-switch button {
    background: transparent;
    border: 1px solid var(--border-color);
    padding: 4px 8px;
    cursor: pointer;
    font-weight: 600;
    border-radius: 4px;
    font-size: 0.85rem;
}

.lang-switch button.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Hero Section */
.hero {
    padding: 100px 0 80px;
    text-align: center;
    background: linear-gradient(to bottom, #f8fafc, #ffffff);
}

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

.hero .subtitle {
    font-size: 1.2rem;
    color: #666;
    margin-bottom: 30px;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 15px;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: background 0.2s;
}

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

.btn.primary:hover {
    background: var(--primary-dark);
}

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

.btn.secondary:hover {
    background: rgba(10, 102, 194, 0.05);
}

/* Sections */
.section {
    padding: 70px 0;
}

.bg-light {
    background-color: var(--bg-light);
}

.section h2 {
    font-size: 1.8rem;
    margin-bottom: 30px;
    text-align: center;
}

/* Timeline */
.timeline {
    border-left: 2px solid var(--primary-color);
    padding-left: 20px;
    margin: 0 auto;
    max-width: 800px;
}

.timeline-item {
    margin-bottom: 35px;
    position: relative;
}

.timeline-item h3 {
    font-size: 1.2rem;
    font-weight: 600;
}

.timeline-item .role {
    display: block;
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 8px;
}

/* Skills Grid */
.skills-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    max-width: 800px;
    margin: 0 auto;
}

.card {
    background: white;
    border: 1px solid var(--border-color);
    padding: 25px;
    border-radius: 8px;
}

.card h3 {
    margin-bottom: 15px;
    font-size: 1.1rem;
    color: var(--primary-color);
}

.card ul {
    list-style-position: inside;
    color: #555;
}

.card li {
    margin-bottom: 8px;
    font-size: 0.95rem;
}

.text-center {
    text-align: center;
}

/* Footer */
footer {
    padding: 30px 0;
    border-dt: 1px solid var(--border-color);
    font-size: 0.9rem;
    color: #666;
}

/* Responsive */
@media (max-width: 768px) {
    .skills-grid {
        grid-template-columns: 1fr;
    }
    nav {
        display: none; /* simple mobile fallback */
    }
    .hero h1 {
        font-size: 2rem;
    }
}