:root {
    --bg: #0f1115;
    --panel: #171a21;
    --ink: #e6e8ec;
    --muted: #9aa3b2;
    --accent: #5b9dff;
    --border: #2a2f3a;
    --error: #ff6b6b;
    --ok: #4ade80;
    color-scheme: dark;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font:
        16px/1.6 -apple-system,
        BlinkMacSystemFont,
        'Segoe UI',
        Roboto,
        Helvetica,
        Arial,
        sans-serif;
}

/* ---- landing / upload ---- */
.wrap {
    max-width: 640px;
    margin: 8vh auto;
    padding: 0 20px;
}
.wrap h1 {
    margin: 0 0 4px;
    font-size: 2rem;
}
.sub {
    color: var(--muted);
    margin: 0 0 28px;
}

.drop {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 180px;
    padding: 24px;
    border: 2px dashed var(--border);
    border-radius: 14px;
    background: var(--panel);
    color: var(--muted);
    text-align: center;
    cursor: pointer;
    transition:
        border-color 0.15s,
        color 0.15s,
        background 0.15s;
}
.drop:hover,
.drop:focus,
.drop.over {
    border-color: var(--accent);
    color: var(--ink);
    outline: none;
}
.drop-text b {
    color: var(--ink);
}

.status {
    min-height: 1.6em;
    margin: 16px 0;
    color: var(--muted);
}
.status.error {
    color: var(--error);
}
.status.ok {
    color: var(--ok);
}

.result {
    display: flex;
    gap: 8px;
    align-items: flex-end;
    flex-wrap: wrap;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 14px;
}
.result label {
    flex: 1 1 260px;
    font-size: 0.85rem;
    color: var(--muted);
}
.result input {
    width: 100%;
    margin-top: 6px;
    padding: 9px 10px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg);
    color: var(--ink);
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
.result button,
.result .open {
    padding: 9px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--accent);
    color: #06122b;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
}
.result .open {
    background: transparent;
    color: var(--accent);
}

/* ---- viewer ---- */
.doc {
    max-width: 820px;
    margin: 40px auto;
    padding: 0 24px 80px;
}
.doc .loading,
.doc .error {
    color: var(--muted);
}
.doc .error {
    color: var(--error);
}

.doc h1,
.doc h2 {
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.3em;
}
.doc h1,
.doc h2,
.doc h3,
.doc h4 {
    line-height: 1.25;
}
.doc a {
    color: var(--accent);
}
.doc img {
    max-width: 100%;
}
.doc pre {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 14px;
    overflow: auto;
}
.doc code {
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 0.9em;
}
.doc :not(pre) > code {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 5px;
    padding: 0.1em 0.4em;
}
.doc blockquote {
    margin: 0;
    padding: 0.2em 1em;
    border-left: 3px solid var(--border);
    color: var(--muted);
}
.doc table {
    border-collapse: collapse;
    width: 100%;
}
.doc th,
.doc td {
    border: 1px solid var(--border);
    padding: 6px 10px;
}
.mermaid-diagram {
    margin: 20px 0;
}
/* Fallback for a plain (non-interactive) diagram, e.g. a render error. */
.mermaid-diagram > svg {
    display: block;
    max-width: 100%;
    height: auto;
    margin: 0 auto;
}

/* --- interactive (pan/zoom) diagram --- */
.mm-viewport {
    position: relative;
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--panel);
    cursor: grab;
    touch-action: none; /* we handle drag/pinch ourselves */
    user-select: none;
}
.mm-viewport.mm-panning {
    cursor: grabbing;
}
.mm-pane {
    position: absolute;
    top: 0;
    left: 0;
    transform-origin: 0 0;
    will-change: transform;
}
.mm-pane > svg {
    display: block;
    max-width: none; /* Mermaid sets an inline max-width; let us scale freely */
}
.mm-controls {
    position: absolute;
    top: 8px;
    right: 8px;
    display: flex;
    gap: 4px;
    opacity: 0.55;
    transition: opacity 0.15s;
}
.mm-viewport:hover .mm-controls,
.mm-controls:focus-within {
    opacity: 1;
}
.mm-controls button {
    width: 28px;
    height: 28px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    line-height: 1;
    color: var(--ink);
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
}
.mm-controls button:hover,
.mm-controls button:focus {
    border-color: var(--accent);
    color: var(--accent);
    outline: none;
}