:root {
    --bg: #fafafa;
    --fg: #1a1a1a;
    --muted: #888;
    --border: #e5e5e5;
    --success-bg: #f0fdf4;
    --success-border: #86efac;
    --error-bg: #fef2f2;
    --error-fg: #b91c1c;
    --error-border: #fca5a5;
    --code-bg: #f3f4f6;
    --input-bg: #fff;
    --input-border: #d1d5db;
    --input-focus: #3b82f6;
    --badge-bg: #e0e7ff;
    --badge-fg: #3730a3;
    --link: #2563eb;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #111;
        --fg: #e5e5e5;
        --muted: #777;
        --border: #2a2a2a;
        --success-bg: #052e16;
        --success-border: #166534;
        --error-bg: #450a0a;
        --error-fg: #fca5a5;
        --error-border: #7f1d1d;
        --code-bg: #1e1e1e;
        --input-bg: #1a1a1a;
        --input-border: #404040;
        --input-focus: #60a5fa;
        --badge-bg: #1e1b4b;
        --badge-fg: #a5b4fc;
        --link: #60a5fa;
    }
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--fg);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 640px;
    margin: 0 auto;
    padding: 4rem 1.5rem 2rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header { text-align: center; margin-bottom: 2rem; }

h1 {
    font-size: 1.4rem;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.badge {
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 0.85em;
    background: var(--badge-bg);
    color: var(--badge-fg);
    padding: 0.15em 0.5em;
    border-radius: 5px;
    font-weight: 700;
    margin-right: 0.15em;
}

.subtitle {
    color: var(--muted);
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

.subtitle a { color: var(--link); text-decoration: none; }
.subtitle a:hover { text-decoration: underline; }

.input-row {
    display: flex;
    gap: 0.5rem;
}

.purl-input {
    flex: 1;
    min-width: 0;
    padding: 0.75rem 1rem;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 0.95rem;
    border: 1.5px solid var(--input-border);
    border-radius: 10px;
    background: var(--input-bg);
    color: var(--fg);
    outline: none;
    transition: border-color 0.15s, box-shadow 0.15s;
}

.purl-input:focus {
    border-color: var(--input-focus);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--input-focus) 20%, transparent);
}

.share-btn {
    padding: 0.75rem 1.25rem;
    font-size: 0.85rem;
    font-weight: 600;
    border: 1.5px solid var(--input-border);
    border-radius: 10px;
    background: var(--input-bg);
    color: var(--fg);
    cursor: pointer;
    white-space: nowrap;
    transition: background 0.15s, border-color 0.15s;
}

.share-btn:hover:not(:disabled) {
    border-color: var(--input-focus);
}

.share-btn:disabled {
    opacity: 0.4;
    cursor: default;
}

.share-btn.copied {
    border-color: var(--success-border);
    color: #16a34a;
}

.result { margin-top: 1.25rem; }

.hint { color: var(--muted); text-align: center; font-size: 0.85rem; padding: 1rem 0; }

.error {
    padding: 1rem 1.25rem;
    background: var(--error-bg);
    border: 1px solid var(--error-border);
    border-radius: 10px;
    color: var(--error-fg);
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 0.9rem;
    line-height: 1.5;
}

.error-label { font-weight: 700; }

.success {
    border: 1px solid var(--success-border);
    background: var(--success-bg);
    border-radius: 10px;
    overflow: hidden;
}

.canonical {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--success-border);
}

.canonical .label {
    display: block;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--muted);
    margin-bottom: 0.25rem;
    font-weight: 600;
}

.canonical code {
    font-size: 0.9rem;
    word-break: break-all;
}

.fields { width: 100%; border-collapse: collapse; }
.fields th, .fields td { padding: 0.6rem 1.25rem; text-align: left; }

.fields th {
    width: 110px;
    font-weight: 600;
    font-size: 0.8rem;
    color: var(--muted);
    vertical-align: top;
}

.fields tr + tr { border-top: 1px solid var(--border); }

.fields code {
    background: var(--code-bg);
    padding: 0.15em 0.35em;
    border-radius: 4px;
    font-size: 0.9rem;
}

.none { color: var(--muted); font-style: italic; font-size: 0.85rem; }

.qualifiers-list { list-style: none; }
.qualifiers-list li + li { margin-top: 0.25rem; }

footer {
    margin-top: auto;
    padding-top: 3rem;
    text-align: center;
    font-size: 0.8rem;
}

footer a { color: var(--muted); text-decoration: none; }
footer a:hover { color: var(--fg); }