:root {
    --primary-color: #2563eb;
    --text-main: #1f2937;
    --text-muted: #6b7280;
    --bg-body: #f9fafb;
    --bg-card: #ffffff;
    --border-color: #e5e7eb;
}

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

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    background-color: var(--bg-body);
    color: var(--text-main);
    padding: 40px 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #111827;
}

.subtitle {
    font-size: 1.2rem;
    color: var(--primary-color);
    margin-top: 5px;
    font-weight: 600;
}

.meta {
    margin-top: 15px;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.meta span {
    margin: 0 10px;
}

.intro {
    background: #eff6ff;
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
    margin-bottom: 30px;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 24px;
    border-radius: 12px;
    margin-bottom: 20px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

h2 {
    font-size: 1.25rem;
    margin-bottom: 12px;
    color: #111827;
}

code {
    background: #f3f4f6;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: monospace;
    font-size: 0.95rem;
}

.contact {
    text-align: center;
    padding: 40px 0;
}

.email-btn {
    display: inline-block;
    margin-top: 15px;
    padding: 12px 24px;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 6px;
    font-weight: 600;
    transition: background 0.2s;
}

.email-btn:hover {
    background-color: #1d4ed8;
}

footer {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 600px) {
    h1 { font-size: 1.8rem; }
    .meta span { display: block; margin-bottom: 5px; }
}