body {
    margin: 0;
    font-family: system-ui, -apple-system, sans-serif;
    background: #fdfdfd;
    color: #333;
}
.theme-bright { --bg-color: #fdfdfd; --text-color: #333; --border-color: #ddd; }
.theme-night { --bg-color: #1a1a1a; --text-color: #e0e0e0; --border-color: #444; background: var(--bg-color); color: var(--text-color); }

.navbar {
    display: flex;
    justify-content: space-between;
    padding: 1rem 2rem;
    background: var(--bg-color);
    color: var(--text-color);
    border-bottom: 1px solid var(--border-color);
}
.navbar a {
    text-decoration: none;
    color: inherit;
    margin-left: 1rem;
    font-weight: 500;
}
.container {
    padding: 2rem;
    max-width: 800px;
    margin: 0 auto;
}
.card {
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 1rem;
    background: var(--bg-color);
    cursor: pointer;
    transition: 0.2s;
}
.card:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}
.card-actions {
    margin-top: 1rem;
    display: flex;
    gap: 0.5rem;
}
form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    max-width: 400px;
    margin: 0 auto;
}
input, textarea {
    padding: 0.8rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: var(--bg-color);
    color: var(--text-color);
}
button {
    padding: 0.8rem;
    background: #0066cc;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
}
button.danger {
    background: #cc0000;
}
button:hover {
    opacity: 0.9;
}
.error { color: #cc0000; margin-bottom: 1rem; }
.success { color: #008800; margin-bottom: 1rem; }