:root {
  --bg: #f4f5fb; --surface: #ffffff; --surface-2: #f0f1f9; --border: #e0e2f0;
  --text: #1b1d2e; --muted: #6a6f8a;
  --accent: #6366f1; --accent-2: #8b5cf6; --accent-text: #ffffff;
  --danger: #e5484d; --ok: #2fa66a;
  --shadow: 0 10px 30px -12px rgba(40, 44, 100, .25);
  --tok-tag: #c2255c; --tok-attr: #0b7285; --tok-string: #2b8a3e; --tok-number: #d9480f;
  --tok-comment: #8b8fa8; --tok-meta: #7048e8; --tok-punct: #868aa3; --tok-keyword: #5f3dc4; --tok-error: #e5484d;
  --radius: 18px;
  color-scheme: light;
}
:root[data-theme="dark"] {
  --bg: #0e1020; --surface: #171a2e; --surface-2: #1e2240; --border: #2a2f52;
  --text: #e8eaf8; --muted: #9096b8;
  --shadow: 0 14px 40px -16px rgba(0, 0, 0, .7);
  --tok-tag: #ff7fa8; --tok-attr: #6fd6e8; --tok-string: #8be28b; --tok-number: #ffb067;
  --tok-comment: #6c7296; --tok-meta: #b79cff; --tok-punct: #8c92b8; --tok-keyword: #c0a6ff; --tok-error: #ff6b6b;
  color-scheme: dark;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e1020; --surface: #171a2e; --surface-2: #1e2240; --border: #2a2f52;
    --text: #e8eaf8; --muted: #9096b8;
    --shadow: 0 14px 40px -16px rgba(0, 0, 0, .7);
    --tok-tag: #ff7fa8; --tok-attr: #6fd6e8; --tok-string: #8be28b; --tok-number: #ffb067;
    --tok-comment: #6c7296; --tok-meta: #b79cff; --tok-punct: #8c92b8; --tok-keyword: #c0a6ff; --tok-error: #ff6b6b;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body { overflow: hidden; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  display: flex; flex-direction: column;
  background-image: radial-gradient(900px 400px at 10% -10%, color-mix(in srgb, var(--accent) 14%, transparent), transparent),
                    radial-gradient(700px 400px at 100% 0%, color-mix(in srgb, var(--accent-2) 12%, transparent), transparent);
  background-attachment: fixed;
}

/* ---- header ---- */
.top { display: flex; align-items: center; gap: 20px; padding: 16px 28px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 10px; font-size: 20px; letter-spacing: -.02em; }
.brand b { color: var(--accent); font-weight: 700; }
.logo {
  display: inline-grid; place-items: center; width: 36px; height: 36px; border-radius: 12px; color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); font: 700 13px ui-monospace, monospace;
  box-shadow: 0 6px 16px -6px var(--accent);
}
.tabs { display: flex; gap: 6px; padding: 5px; background: var(--surface); border: 1px solid var(--border); border-radius: 999px; box-shadow: var(--shadow); margin: 0 auto 0 8px; }
.tab { border: 0; background: transparent; color: var(--muted); padding: 9px 18px; border-radius: 999px; cursor: pointer; font: inherit; font-weight: 600; transition: .15s; }
.tab:hover { color: var(--text); }
.tab[aria-selected="true"] { color: var(--accent-text); background: linear-gradient(135deg, var(--accent), var(--accent-2)); box-shadow: 0 6px 16px -8px var(--accent); }

/* ---- buttons ---- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  padding: 9px 18px; border-radius: 999px; font: inherit; font-weight: 600; cursor: pointer; transition: .15s;
}
.btn:hover { border-color: var(--accent); transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn:focus-visible, .tab:focus-visible, select:focus-visible { outline: 3px solid color-mix(in srgb, var(--accent) 45%, transparent); outline-offset: 2px; }
.btn.primary { color: var(--accent-text); border: 0; padding: 13px 30px; font-size: 16px; background: linear-gradient(135deg, var(--accent), var(--accent-2)); box-shadow: 0 10px 22px -10px var(--accent); }
.btn.primary:hover { filter: brightness(1.08); }
.btn.primary[disabled] { opacity: .6; cursor: progress; transform: none; }
.btn.small { padding: 5px 13px; font-size: 13px; }
.btn.ghost { background: transparent; }
.btn.icon { width: 40px; height: 40px; padding: 0; font-size: 18px; }

/* ---- tool layout ---- */
main { flex: 1; min-height: 0; padding: 4px 28px 28px; display: flex; }
.tool { display: none; flex: 1; min-height: 0; flex-direction: column; gap: 14px; }
.tool.active { display: flex; }
.intro { color: var(--muted); margin: 0; }
.workspace { flex: 1; min-height: 0; display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); grid-template-rows: minmax(0, 1fr); gap: 16px; align-items: stretch; }
.panel { display: flex; flex-direction: column; min-height: 0; min-width: 0; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; }
.panel > header { display: flex; align-items: center; gap: 8px; padding: 10px 14px; border-bottom: 1px solid var(--border); background: var(--surface-2); }
.panel > header h2 { margin: 0 auto 0 0; font-size: 13px; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); }
.panel select { border-radius: 999px; border: 1px solid var(--border); background: var(--surface); color: var(--text); padding: 4px 10px; font: inherit; font-size: 13px; }
.editor { flex: 1; min-height: 0; position: relative; overflow: hidden; }
.editor .cm-editor { height: 100% !important; background: transparent; }
.editor .cm-scroller { font: 13px/1.55 ui-monospace, "JetBrains Mono", "Cascadia Code", Menlo, Consolas, monospace; }
.cm-editor.cm-focused { outline: none; }
.cm-editor .cm-gutters { background: transparent; border: 0; color: var(--muted); }
.cm-editor .cm-content { caret-color: var(--text); color: var(--text); }
.cm-editor .cm-cursor { border-left-color: var(--text); }
.cm-editor .cm-activeLine { background: color-mix(in srgb, var(--accent) 7%, transparent); }
.cm-editor .cm-activeLineGutter { background: transparent; color: var(--text); }
.cm-editor .cm-selectionBackground, .cm-editor.cm-focused .cm-selectionBackground { background: color-mix(in srgb, var(--accent) 30%, transparent) !important; }
.cm-editor .cm-placeholder { color: var(--muted); }

.action { display: flex; flex-direction: column; justify-content: center; align-items: center; gap: 12px; }
.status { min-height: 1.4em; font-size: 13px; text-align: center; max-width: 160px; }
.status.err { color: var(--danger); }
.panel.error { border-color: var(--danger); }
.errorbar { display: none; padding: 10px 14px; color: var(--danger); background: color-mix(in srgb, var(--danger) 10%, transparent); border-top: 1px solid color-mix(in srgb, var(--danger) 40%, transparent); font-size: 13px; }
.panel.error .errorbar { display: block; }

.toast { position: fixed; left: 50%; bottom: 26px; transform: translate(-50%, 20px); opacity: 0; pointer-events: none; background: var(--text); color: var(--bg); padding: 9px 18px; border-radius: 999px; font-weight: 600; transition: .2s; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }

@media (max-width: 860px) {
  body { overflow: auto; height: auto; min-height: 100%; }
  .tool.active { min-height: 0; }
  .workspace { flex: none; }
  main { padding: 4px 14px 20px; }
  .top { padding: 12px 14px; }
  .workspace { grid-template-columns: minmax(0, 1fr); grid-template-rows: 55vh auto 55vh; }
  .action { flex-direction: row; }
  .status { max-width: none; }
  .tabs { margin: 0; order: 3; width: 100%; overflow-x: auto; }
  .tab { white-space: nowrap; }
}

/* ---- scrollbars: always visible, both directions, themed ---- */
.editor .cm-scroller { overflow: scroll !important; scrollbar-width: auto; scrollbar-color: color-mix(in srgb, var(--muted) 55%, transparent) var(--surface-2); }