* {
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    margin: 0;
    background: #f4f4f4;
    color: #222;
    line-height: 1.5;
}

header {
    background: #111827;
    color: white;
    padding: 1rem;
}

header h1 {
    margin: 0 0 0.75rem 0;
}

nav {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 0.4rem 0;
}

main {
    width: min(1200px, 100%);
    margin: 0 auto;
    padding: 1rem;
}

h2,
h3 {
    margin-top: 1.5rem;
}

.cards {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

.card {
    background: white;
    padding: 1rem;
    border-radius: 10px;
    overflow-wrap: anywhere;
}

table {
    width: 100%;
    background: white;
    border-collapse: collapse;
    margin-bottom: 1.5rem;
}

th,
td {
    padding: 0.75rem;
    border-bottom: 1px solid #ddd;
    text-align: left;
    vertical-align: top;
}

form {
    background: white;
    padding: 1rem;
    border-radius: 10px;
    margin-bottom: 1.5rem;
}

label {
    display: block;
    font-weight: bold;
    margin-top: 1rem;
    margin-bottom: 0.4rem;
}

input,
select,
textarea,
button {
    font: inherit;
}

input,
select,
textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ccc;
    border-radius: 8px;
}

textarea {
    font-family: monospace;
}

button {
    min-height: 44px;
    margin-top: 1rem;
    padding: 0.75rem 1rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}

.error {
    background: #fee2e2;
    border: 1px solid #ef4444;
    padding: 1rem;
    margin-bottom: 1rem;
    border-radius: 8px;
}

pre {
    white-space: pre-wrap;
    overflow-wrap: anywhere;
}

img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
}

/* Tablet and desktop */
@media (min-width: 768px) {
    header {
        padding: 1rem 2rem;
    }

    main {
        padding: 2rem;
    }

    .cards {
        grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    }
}

/* Phone-friendly tables */
@media (max-width: 700px) {
    table,
    thead,
    tbody,
    tr,
    th,
    td {
        display: block;
    }

    table {
        background: transparent;
    }

    tr {
        background: white;
        margin-bottom: 1rem;
        padding: 0.75rem;
        border-radius: 10px;
    }

    th {
        display: none;
    }

    td {
        border-bottom: none;
        padding: 0.35rem 0;
    }
}

.button-link {
    display: inline-block;
    min-height: 44px;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    background: #111827;
    color: white;
    text-decoration: none;
    font-weight: bold;
    line-height: 1.3;
}

.button-link:hover {
    opacity: 0.9;
}