:root {
    --primary: #2563eb;
    --bg-color: #f3f4f6;
    --card-bg: #ffffff;
    --text-main: #1f2937;
    --text-muted: #4b5563;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    margin: 0;
    padding: 0;
    padding-bottom: 40px;
}

header {
    background-color: var(--primary);
    color: white;
    padding: 1rem 0 0 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    margin: 0 0 1rem 0;
    font-size: 1.5rem;
}

.tabs {
    display: flex;
    background: rgba(0,0,0,0.1);
}

.tab-btn {
    flex: 1;
    background: none;
    border: none;
    color: white;
    padding: 10px;
    cursor: pointer;
    opacity: 0.7;
    font-weight: bold;
    transition: 0.3s;
}

.tab-btn.active {
    opacity: 1;
    border-bottom: 4px solid white;
    background: rgba(255,255,255,0.1);
}

.tab-btn small {
    font-weight: normal;
    font-size: 0.8rem;
}

main {
    padding: 1rem;
    max-width: 600px;
    margin: 0 auto;
}

.section-title {
    border-bottom: 2px solid var(--primary);
    padding-bottom: 5px;
    margin-top: 1.5rem;
    color: var(--primary);
}

.card {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 15px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.card h3 {
    margin-top: 0;
    color: var(--text-main);
}

.card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.5;
}

.btn-link {
    display: inline-block;
    background: #ef4444;
    color: white;
    padding: 8px 15px;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    font-size: 0.9rem;
    margin-top: 10px;
}

.btn-link:hover {
    background: #dc2626;
}