:root {
    --primary: #1976d2;
    --primary-dark: #115293;
    --danger: #d32f2f;
    --danger-dark: #9a0007;
    --bg: #ffffff;
    --bg-light: #f5f5f5;
    --text: #333333;
    --text-light: #666666;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--text);
    line-height: 1.6;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background-color: var(--bg);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary);
}

.nav a {
    margin-right: 1.5rem;
    text-decoration: none;
    color: var(--text);
    font-weight: 500;
}

.nav a:hover {
    color: var(--primary);
}

.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    background-color: var(--primary);
    color: white;
    text-decoration: none;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    font-weight: bold;
}

.btn:hover {
    background-color: var(--primary-dark);
}

.btn-large {
    padding: 0.75rem 1.5rem;
    font-size: 1.1rem;
}

.btn-danger {
    background-color: var(--danger);
}

.btn-danger:hover {
    background-color: var(--danger-dark);
}

.btn-danger:disabled {
    background-color: #e0e0e0;
    color: #9e9e9e;
    cursor: not-allowed;
}

.hero {
    text-align: center;
    padding: 4rem 2rem;
    background-color: var(--bg-light);
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-light);
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.section {
    padding: 4rem 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.section h2 {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 2rem;
}

.bg-light {
    background-color: var(--bg-light);
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.card {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.card h3 {
    margin-bottom: 1rem;
    color: var(--primary);
}

.danger-zone {
    border: 1px solid var(--danger);
    background-color: #fffafa;
}

.danger-text {
    color: var(--danger);
}

.hidden {
    display: none !important;
}

.form-group {
    margin-top: 1.5rem;
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: bold;
}

.form-group input, .form-group textarea {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-family: inherit;
}

#delete-message {
    margin-top: 1rem;
    font-weight: bold;
}

footer {
    text-align: center;
    padding: 2rem;
    background-color: var(--text);
    color: white;
}