:root { 
    --primary: #0f172a; 
    --accent: #3b82f6; 
    --text: #334155; 
    --bg: #f8fafc; 
    --white: #ffffff;
}

body { 
    font-family: 'Inter', sans-serif; 
    line-height: 1.6; 
    color: var(--text); 
    max-width: 900px; 
    margin: 0 auto; 
    padding: 40px 20px; 
    background-color: var(--bg); 
}

.cv-card { 
    background: var(--white); 
    padding: 50px; 
    border-radius: 16px; 
    box-shadow: 0 10px 25px rgba(0,0,0,0.05); 
    border-top: 8px solid var(--accent); 
}

header { 
    border-bottom: 1px solid #e2e8f0; 
    padding-bottom: 20px; 
    margin-bottom: 30px; 
}

h1 { 
    margin: 0; 
    color: var(--primary); 
    font-size: 2.2rem; 
    font-weight: 800; 
    letter-spacing: -0.025em;
}

.title { 
    font-size: 1.1rem; 
    color: var(--accent); 
    font-weight: 600; 
    text-transform: uppercase; 
    letter-spacing: 1px; 
    margin-top: 5px;
}

.info { 
    margin-top: 15px; 
    font-size: 0.9rem; 
    color: #64748b; 
}

.info span i {
    color: var(--accent);
    margin-right: 5px;
}

section { margin-bottom: 35px; }

h2 { 
    font-size: 1.2rem; 
    color: var(--primary); 
    border-left: 4px solid var(--accent); 
    padding-left: 15px; 
    margin-bottom: 20px; 
    text-transform: uppercase; 
    letter-spacing: 0.05em;
}

.grid { 
    display: grid; 
    grid-template-columns: 1fr 1fr; 
    gap: 20px; 
}

.stack-box {
    background: #f1f5f9;
    padding: 15px;
    border-radius: 10px;
}

.tags-container {
    margin-top: 10px;
}

.exp-item { margin-bottom: 20px; }

.exp-header { 
    display: flex; 
    justify-content: space-between; 
    font-weight: 700; 
    color: var(--primary); 
}

.date-tag {
    background: var(--accent);
    color: white;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
}

.tag { 
    background: #eff6ff; 
    color: #2563eb; 
    padding: 3px 10px; 
    border-radius: 6px; 
    font-size: 0.8rem; 
    font-weight: 600; 
    border: 1px solid #dbeafe; 
    margin: 2px; 
    display: inline-block; 
}

.highlight { color: var(--accent); font-weight: 600; }

footer { 
    text-align: center; 
    font-size: 0.8rem; 
    color: #94a3b8; 
    margin-top: 40px; 
    padding: 20px;
}

/* Responsive cho điện thoại */
@media (max-width: 600px) {
    .grid { grid-template-columns: 1fr; }
    .cv-card { padding: 25px; }
    h1 { font-size: 1.8rem; }
}