:root {
    --primary: #2c3e50;
    --accent: #3498db;
    --bg: #f4f6f9;
    --card-bg: #ffffff;
    --text: #333;
    --border: #ddd;
}
body {
    font-family: system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    margin: 0;
    padding: 0;
}
header {
    background: var(--primary);
    color: white;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
nav a {
    color: white;
    text-decoration: none;
    margin-left: 1rem;
}
.login-container, .cards-grid {
    max-width: 600px;
    margin: 2rem auto;
    padding: 1rem;
}
.card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    margin-bottom: 1rem;
}
.status-bar {
    height: 8px;
    background: #eee;
    border-radius: 4px;
    overflow: hidden;
    margin: 1rem 0;
}
.progress {
    height: 100%;
    background: var(--accent);
}
input, button {
    width: 100%;
    padding: 0.8rem;
    margin: 0.5rem 0;
    border: 1px solid var(--border);
    border-radius: 8px;
}
button {
    background: var(--primary);
    color: white;
    border: none;
    cursor: pointer;
}
@media (max-width: 480px) {
    nav a { margin: 0 0.5rem; }
}