* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f5f7fb;
    color: #1f2937;
}

.container {
    max-width: 980px;
    margin: 0 auto;
    padding: 24px;
}

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding: 14px 18px;
    background: #ffffff;
    border: 1px solid #dbe3ee;
    border-radius: 10px;
}

.topbar nav a {
    margin-left: 14px;
    text-decoration: none;
    color: #2563eb;
}

h1, h2 {
    margin-top: 0;
}

.card {
    background: #ffffff;
    border: 1px solid #dbe3ee;
    border-radius: 10px;
    padding: 18px;
    margin-bottom: 18px;
}

.form {
    max-width: 420px;
}

.form label {
    display: block;
    margin: 10px 0 6px;
    font-weight: 600;
}

.form input[type="text"],
.form input[type="email"],
.form input[type="password"],
.form input:not([type]),
.form select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #cbd5e1;
    border-radius: 8px;
    background: #fff;
}

.checkbox {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 12px 0;
}

.checkbox input {
    width: auto;
}

button,
.button-link {
    display: inline-block;
    border: 0;
    border-radius: 8px;
    padding: 10px 14px;
    background: #2563eb;
    color: #ffffff;
    cursor: pointer;
    text-decoration: none;
}

button.danger {
    background: #dc2626;
}

.flash {
    padding: 12px 14px;
    border-radius: 8px;
    margin-bottom: 16px;
}

.flash.success {
    background: #dcfce7;
    color: #166534;
}

.flash.error {
    background: #fee2e2;
    color: #991b1b;
}

.grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 18px;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
}

th, td {
    padding: 10px;
    border-bottom: 1px solid #e5e7eb;
    text-align: left;
    vertical-align: top;
}

@media (min-width: 900px) {
    .grid {
        grid-template-columns: 360px 1fr;
    }
}