/* M-N interaction diagram: plain and functional */

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 15px;
    line-height: 1.4;
    color: #222;
    background: #fff;
}

main {
    max-width: 1500px;
    margin: 0 auto;
    padding: 12px 16px 32px;
}

h1 {
    font-size: 24px;
    margin: 8px 0;
    padding-bottom: 6px;
    border-bottom: thin solid lightgrey;
}

h2 {
    font-size: 18px;
}

header p {
    margin: 6px 0 12px;
}

header a {
    margin-left: 12px;
}

.small {
    font-size: 13px;
    color: #555;
}

.error {
    color: #b00020;
}

.start-error {
    padding: 12px 16px;
    font-size: 17px;
    font-weight: bold;
    border: 2px solid #b00020;
    border-radius: 5px;
    background: #fdecee;
}

[hidden] {
    display: none !important;
}

/* language switch, at the top right of both pages */

.languages {
    float: right;
    margin-top: 8px;
}

.languages button {
    padding: 3px 9px;
    font: inherit;
    font-size: 13px;
    color: #1f4e79;
    background: #fff;
    border: 1px solid #1f4e79;
    border-radius: 3px;
    cursor: pointer;
}

.languages button.active {
    color: #fff;
    background: #1f4e79;
}

#drop-zone button {
    margin: 4px 6px 0 0;
}

/* landing page */

.norms {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

.norm {
    flex: 1 1 260px;
    max-width: 420px;
    padding: 20px;
    border: 2px solid #1f4e79;
    border-radius: 6px;
    color: #1f4e79;
    text-decoration: none;
}

.norm:hover,
.norm:focus {
    background: #eaf1f8;
}

.norm strong {
    display: block;
    font-size: 20px;
    margin-bottom: 6px;
}

/* file */

#drop-zone {
    padding: 10px 12px;
    border: 1px dashed #666;
    border-radius: 5px;
    margin-bottom: 12px;
}

#drop-zone.over {
    background: #eaf1f8;
    border-color: #1f4e79;
}

#drop-zone p {
    margin: 6px 0 0;
}

#file-message:empty {
    display: none;
}

/* inputs on the left, diagram on the right */

.layout {
    display: grid;
    grid-template-columns: 290px minmax(0, 1fr);
    gap: 16px;
    align-items: start;
}

fieldset {
    margin: 0 0 12px;
    padding: 8px 10px 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
}

legend {
    font-weight: bold;
    padding: 0 4px;
}

label {
    display: block;
    margin-top: 6px;
    font-size: 13px;
}

input[type="text"] {
    display: block;
    width: 100%;
    margin-top: 2px;
    padding: 5px 6px;
    font-size: 15px;
    border: 1px solid #888;
    border-radius: 3px;
}

label.check {
    display: flex;
    gap: 6px;
    align-items: flex-start;
    margin-top: 8px;
}

.choice {
    margin-top: 8px;
    padding: 4px 6px;
    font-size: 13px;
    border: 1px solid transparent;
    border-radius: 3px;
}

/* the label on a line of its own, the options side by side below it */
.choice-label {
    display: block;
}

.choice .options {
    display: flex;
    flex-wrap: nowrap;
    gap: 20px;
}

.choice label.check {
    display: inline-flex;
    margin-top: 6px;
    white-space: nowrap;
}

input.invalid,
.choice.invalid {
    border-color: #b00020;
    background: #fdecee;
}

fieldset p {
    margin: 6px 0 0;
}

/* output */

#messages {
    padding: 8px 12px;
    margin-bottom: 10px;
    border: 1px solid #b00020;
    border-radius: 5px;
    background: #fdecee;
}

#messages p {
    margin: 2px 0;
}

/* values are still missing: a neutral hint, not an error */
#messages.info {
    border-color: #1f4e79;
    background: #eaf1f8;
    color: #1f4e79;
}

/* the input is the example, not a project */
.example-note {
    margin: 0 0 6px;
    padding: 4px 10px;
    font-weight: bold;
    color: #7a4b00;
    background: #fff6d6;
    border: 1px solid #e0c060;
    border-radius: 5px;
}

#diagram {
    width: 100%;
    height: 720px;
}

#hints {
    padding-left: 20px;
}

#hints li {
    margin-bottom: 3px;
}

/* table of the load points */

#table {
    max-height: 520px;
    overflow: auto;
    border: 1px solid #ccc;
}

#table:empty {
    border: none;
}

table {
    border-collapse: collapse;
    width: 100%;
    font-size: 13px;
    font-variant-numeric: tabular-nums;
}

th,
td {
    padding: 3px 8px;
    text-align: right;
    white-space: nowrap;
    border-bottom: 1px solid #e4e4e4;
}

th {
    position: sticky;
    top: 0;
    background: #e2e2e2;
}

td:last-child,
th:last-child {
    text-align: left;
}

/* a click on the head sorts the table */
th button {
    width: 100%;
    padding: 0;
    border: none;
    background: none;
    font: inherit;
    font-weight: bold;
    color: inherit;
    text-align: inherit;
    cursor: pointer;
}

th button:hover,
th button:focus-visible {
    text-decoration: underline;
}

tr.outside td {
    background: #fdecee;
    color: #b00020;
}

tr.above td {
    background: #fff6d6;
}

footer {
    margin-top: 16px;
}

/* what has been compared with another program, and what has not */
.validation {
    max-width: 860px;
    margin: 16px 0 8px;
}

/* small screen: one column */

@media (max-width: 800px) {
    .layout {
        grid-template-columns: minmax(0, 1fr);
    }

    #diagram {
        height: 460px;
    }
}