:root {
    color-scheme: light;
    font-family: Arial, sans-serif;
}

body {
    margin: 0;
    background: #f4f6f8;
    color: #1f2937;
}

.topbar {
    background: #0f766e;
    color: #fff;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.topbar a {
    color: #fff;
    margin-left: 0.75rem;
    text-decoration: none;
}

.container {
    max-width: 720px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.card {
    background: #fff;
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
}

form {
    display: grid;
    gap: 0.75rem;
}

input, button, textarea, select {
    padding: 0.65rem;
    font-size: 1rem;
}

textarea {
    min-height: 90px;
}

button {
    background: #0f766e;
    border: 0;
    color: #fff;
    border-radius: 6px;
    cursor: pointer;
}

.alert {
    margin-bottom: 1rem;
    padding: 0.75rem;
    border-radius: 6px;
}

.alert.success { background: #dcfce7; }
.alert.error { background: #fee2e2; }

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 0.5rem;
}

th, td {
    border: 1px solid #d1d5db;
    padding: 0.45rem;
    text-align: left;
}