/* MDPDF — compact full-width editor layout. Light theme. */
:root {
    --bg: #f6f7f9;
    --card: #ffffff;
    --border: #e3e6ea;
    --border-strong: #c9ced4;
    --text: #1a1d21;
    --text-muted: #6b7077;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --accent-soft: #eff4ff;
    --danger: #b91c1c;
    --success: #15803d;
    --radius-sm: 6px;
    --topbar-h: 56px;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    height: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 14px;
    line-height: 1.5;
    display: flex;
    flex-direction: column;
}

/* ---------- Top bar ---------- */
.topbar {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 0 16px;
    height: var(--topbar-h);
    background: var(--card);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}
.topbar__brand {
    display: flex;
    align-items: baseline;
    gap: 8px;
    flex-shrink: 0;
}
.topbar__brand strong { font-size: 16px; font-weight: 600; letter-spacing: -.01em; }
.topbar__tag { font-size: 12px; color: var(--text-muted); }

.topbar__drop {
    display: flex;
    align-items: center;
    gap: 10px;
    flex: 1;
    min-width: 0;
    padding: 6px 12px;
    border: 1.5px dashed var(--border-strong);
    border-radius: var(--radius-sm);
    background: #fafbfc;
    transition: border-color .15s, background-color .15s;
}
.topbar__drop.is-dragover {
    border-color: var(--accent);
    background: var(--accent-soft);
}
.topbar__drop-text {
    flex: 1;
    font-size: 13px;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.topbar__drop-text code {
    font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
    background: var(--bg);
    padding: 1px 6px;
    border-radius: 4px;
    font-size: 12px;
    border: 1px solid var(--border);
}

.topbar__actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}
.topbar__title {
    display: flex;
    flex-direction: column;
    gap: 2px;
    font-size: 10px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: .05em;
}
.topbar__title input {
    font-family: inherit;
    font-size: 13px;
    color: var(--text);
    padding: 5px 8px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    outline: none;
    width: 180px;
    text-transform: none;
    letter-spacing: 0;
}
.topbar__title input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-family: inherit;
    font-size: 13px;
    font-weight: 500;
    padding: 7px 14px;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    transition: background-color .15s, border-color .15s, color .15s;
    user-select: none;
    white-space: nowrap;
}
.btn--sm { padding: 5px 10px; font-size: 12px; }
.btn--primary { background: var(--accent); color: #fff; }
.btn--primary:hover:not(:disabled) { background: var(--accent-hover); }
.btn--primary:disabled { background: #9bb4e8; cursor: not-allowed; }
.btn--ghost { background: transparent; color: var(--text); border-color: var(--border-strong); }
.btn--ghost:hover { background: var(--bg); }
.btn__spinner { display: none; width: 12px; height: 12px; border: 2px solid rgba(255,255,255,.4); border-top-color: #fff; border-radius: 50%; animation: spin .7s linear infinite; }
.btn.is-loading .btn__spinner { display: inline-block; }
.btn.is-loading .btn__label { opacity: .8; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Workspace (split pane) ---------- */
.workspace {
    flex: 1;
    display: flex;
    flex-direction: row;
    min-height: 0;
    background: var(--card);
    border-top: 1px solid var(--border);
}
.pane {
    flex: 1 1 50%;
    display: flex;
    flex-direction: column;
    min-width: 0;
    min-height: 0;
}
.pane__bar {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    padding: 8px 14px;
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: .05em;
    border-bottom: 1px solid var(--border);
    background: #fafbfc;
    flex-shrink: 0;
}
.pane__count { font-variant-numeric: tabular-nums; }
.pane__body { flex: 1; min-height: 0; }

/* The preview scrolls; the editor pane is a positioning context for CodeMirror. */
.pane--preview .pane__body { overflow: auto; }
.pane--editor  .pane__body { position: relative; overflow: hidden; background: var(--card); }

/* Splitter (visual only, not draggable) */
.splitter {
    width: 1px;
    background: var(--border);
    flex-shrink: 0;
}

/* ---------- CodeMirror editor ---------- */
/* Hide the raw textarea before CodeMirror takes it over (avoids a flash). */
.pane--editor > .pane__body > textarea#editor {
    width: 100%; height: 100%; border: 0; outline: 0; resize: none;
    padding: 10px 14px; box-sizing: border-box;
    font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
    font-size: 13.5px; line-height: 1.55; color: var(--text); background: var(--card);
}
.pane--editor .CodeMirror {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    height: auto !important;
    font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
    font-size: 13.5px;
    line-height: 1.55;
    color: var(--text);
    background: var(--card);
}
.CodeMirror-gutters { background: #fafbfc; border-right: 1px solid var(--border); }
.CodeMirror-linenumber { color: #b0b6bd; padding: 0 8px 0 6px; }
.CodeMirror-cursor { border-left: 1.5px solid var(--accent); }
.CodeMirror-selected { background: var(--accent-soft) !important; }
.CodeMirror-focused .CodeMirror-selected { background: #d8e4ff !important; }
.CodeMirror-activeline-background { background: #f5f7fb; }

/* Markdown syntax colors — subdued, readable */
.cm-s-default .cm-header   { color: #111; font-weight: 600; }
.cm-s-default .cm-header-1 { font-size: 1.15em; }
.cm-s-default .cm-header-2 { font-size: 1.08em; }
.cm-s-default .cm-quote    { color: #6b7077; font-style: italic; }
.cm-s-default .cm-link     { color: var(--accent); }
.cm-s-default .cm-url      { color: #b91c1c; text-decoration: underline; }
.cm-s-default .cm-strong   { color: #111; font-weight: 700; }
.cm-s-default .cm-em       { color: #1a1d21; font-style: italic; }
.cm-s-default .cm-comment  { color: #6b7077; }
.cm-s-default .cm-tag      { color: #1d4ed8; }
.cm-s-default .cm-attribute { color: #b45309; }
.cm-s-default .cm-string   { color: #15803d; }
.cm-s-default .cm-formatting { color: #b0b6bd; }
.cm-s-default .cm-hr       { color: #b0b6bd; }

/* ---------- Preview ---------- */
.preview {
    padding: 20px 28px;
    color: var(--text);
    font-size: 15px;
    line-height: 1.65;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
.preview h1, .preview h2, .preview h3, .preview h4, .preview h5, .preview h6 {
    margin: 1.4em 0 .5em; font-weight: 600; line-height: 1.25; color: #111;
}
.preview h1 { font-size: 1.85em; padding-bottom: .25em; border-bottom: 1px solid var(--border); margin-top: 0; }
.preview h2 { font-size: 1.45em; padding-bottom: .2em; border-bottom: 1px solid var(--border); }
.preview h3 { font-size: 1.2em; }
.preview h4 { font-size: 1.05em; }
.preview p  { margin: .6em 0; }
.preview a  { color: var(--accent); text-decoration: none; }
.preview a:hover { text-decoration: underline; }
.preview ul, .preview ol { padding-left: 1.6em; margin: .6em 0; }
.preview li { margin: .15em 0; }
.preview blockquote {
    margin: .8em 0;
    padding: .3em 1em;
    border-left: 3px solid var(--border-strong);
    color: var(--text-muted);
    background: #fafbfc;
}
.preview code {
    font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
    font-size: .88em;
    background: #f2f3f5;
    padding: 1px 5px;
    border-radius: 3px;
}
.preview pre {
    background: #f6f7f9;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 12px 14px;
    overflow-x: auto;
    font-size: .88em;
    line-height: 1.5;
}
.preview pre code { background: transparent; padding: 0; font-size: 1em; }
.preview hr { border: 0; border-top: 1px solid var(--border); margin: 1.5em 0; }
.preview table { border-collapse: collapse; margin: .8em 0; width: 100%; }
.preview th, .preview td { border: 1px solid var(--border); padding: 6px 10px; text-align: left; vertical-align: top; }
.preview th { background: #f2f3f5; font-weight: 600; }
.preview img { max-width: 100%; }

/* ---------- Status ---------- */
.status {
    margin: 0;
    padding: 6px 16px;
    font-size: 12px;
    min-height: 26px;
    color: var(--text-muted);
    border-top: 1px solid var(--border);
    background: var(--card);
    flex-shrink: 0;
}
.status.is-error   { color: var(--danger); }
.status.is-success { color: var(--success); }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
    :root { --topbar-h: auto; }
    .topbar { flex-wrap: wrap; padding: 10px 12px; gap: 10px; }
    .topbar__drop { order: 3; flex-basis: 100%; }
    .topbar__actions { margin-left: auto; }
    .topbar__title input { width: 140px; }
    .workspace { flex-direction: column; }
    .splitter { width: 100%; height: 1px; }
}