:root {
    --fg: #222;
    --muted: #666;
    --bg: #fff;
    --panel: #f8f8f8;
    --border: #ddd;
    --accent: #1f5fa8;
    --error-bg: #fdecea;
    --error-fg: #8a1c12;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    color: var(--fg);
    background: var(--bg);
    line-height: 1.4;
}

header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75em 1em;
    border-bottom: 1px solid var(--border);
}

header h1 {
    font-size: 1.25em;
    margin: 0;
}

main {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1em;
}

button {
    font: inherit;
    padding: 0.45em 1em;
    border: 1px solid var(--accent);
    border-radius: 4px;
    background: var(--accent);
    color: #fff;
    cursor: pointer;
}

button.secondary {
    background: transparent;
    color: var(--accent);
}

button:disabled {
    opacity: 0.6;
    cursor: default;
}

input,
textarea {
    font: inherit;
    width: 100%;
    padding: 0.5em;
    border: 1px solid #bbb;
    border-radius: 4px;
}

textarea {
    font-family: ui-monospace, monospace;
    resize: vertical;
}

label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.3em;
}

.muted {
    color: var(--muted);
    font-size: 0.9em;
}

.message {
    margin: 0.75em 0;
    min-height: 1.4em;
}

.message.error {
    color: var(--error-fg);
}

/* login */

.login {
    max-width: 22em;
    margin: 12vh auto 0;
    padding: 1.5em;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--panel);
}

.login h1 {
    margin-top: 0;
    font-size: 1.4em;
}

.login .field {
    margin-bottom: 1em;
}

.login button {
    width: 100%;
}

/* query form */

.query .actions {
    display: flex;
    gap: 0.5em;
    margin-top: 0.5em;
}

/* results table */

.results {
    overflow-x: auto;
}

table {
    border: 1px solid #ccc;
    border-collapse: collapse;
    margin: 0;
    padding: 0;
    width: 100%;
}

table caption {
    font-size: 1.2em;
    margin: 0.5em 0 0.75em;
    text-align: left;
}

table tr {
    background-color: var(--panel);
    border: 1px solid var(--border);
    padding: 0.35em;
}

table th,
table td {
    padding: 0.5em 0.625em;
    text-align: center;
}

table th {
    font-size: 0.8em;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    white-space: nowrap;
}

table td.doi {
    white-space: nowrap;
    text-align: left;
}

table td.citation {
    text-align: left;
    min-width: 20em;
}

table tr.failed td {
    background: var(--error-bg);
    color: var(--error-fg);
    text-align: left;
}

@media screen and (max-width: 700px) {
    table {
        border: 0;
    }

    table thead {
        border: none;
        clip: rect(0 0 0 0);
        height: 1px;
        margin: -1px;
        overflow: hidden;
        padding: 0;
        position: absolute;
        width: 1px;
    }

    table tr {
        border-bottom: 3px solid var(--border);
        display: block;
        margin-bottom: 0.625em;
    }

    table td,
    table td.doi,
    table td.citation {
        border-bottom: 1px solid var(--border);
        display: block;
        font-size: 0.85em;
        text-align: right;
        min-width: 0;
        white-space: normal;
    }

    table td::before {
        content: attr(data-label);
        float: left;
        font-weight: bold;
        text-transform: uppercase;
        margin-right: 1em;
    }

    table td:last-child {
        border-bottom: 0;
    }
}