/* ═══════════════════════════════════════════════════════════════════════
   Shell — app chrome design tokens, reset, header, buttons, overlays.
   (Distinct from the tokens the user edits in the Design workspace.)
   ═══════════════════════════════════════════════════════════════════════ */

:root {
  --app-accent: #2563eb;
  --app-accent-fg: #ffffff;
  --app-bg: #ffffff;
  --app-surface: #f7f8fa;
  --app-surface-2: #eef0f3;
  --app-fg: #14171c;
  --app-fg-muted: #626b78;
  --app-border: #e4e7ec;
  --app-border-strong: #d3d8e0;
  --app-danger: #dc2626;
  --app-radius: 9px;
  --app-radius-sm: 6px;
  --app-shadow: 0 6px 24px rgba(16, 24, 40, 0.1);
  --app-shadow-lg: 0 18px 48px rgba(16, 24, 40, 0.18);
  --app-header-h: 52px;
  --app-font: 'Geist', system-ui, -apple-system, sans-serif;
  --app-mono: 'Geist Mono', ui-monospace, monospace;
  color-scheme: light;
}

:root[data-theme="dark"] {
  --app-accent: #3b82f6;
  --app-bg: #0b0d10;
  --app-surface: #14171c;
  --app-surface-2: #1c2027;
  --app-fg: #eef1f5;
  --app-fg-muted: #98a2b3;
  --app-border: #262b33;
  --app-border-strong: #333a44;
  --app-shadow: 0 6px 24px rgba(0, 0, 0, 0.5);
  --app-shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.6);
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }

html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--app-font);
  font-size: 14px;
  color: var(--app-fg);
  background: var(--app-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.app-root { height: 100vh; display: flex; flex-direction: column; }

/* ── Header ─────────────────────────────────────────────────────────── */
.app-header {
  height: var(--app-header-h);
  flex: none;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 12px;
  border-bottom: 1px solid var(--app-border);
  background: var(--app-bg);
}
.app-brand { display: flex; align-items: center; gap: 8px; text-decoration: none; color: var(--app-fg); font-weight: 600; }
.app-brand__logo { display: inline-flex; }
.app-brand__name { font-size: 14px; letter-spacing: -0.01em; }
.app-header__spacer { flex: 1; }
.app-header__group { display: flex; align-items: center; gap: 4px; }
.app-header__sep { width: 1px; height: 22px; background: var(--app-border); margin: 0 4px; }

/* ── Workspace tabs ─────────────────────────────────────────────────── */
.ws-tabs { display: flex; align-items: center; gap: 2px; margin-left: 6px; padding: 3px; background: var(--app-surface); border-radius: var(--app-radius); }
.ws-tab {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 12px; border: 0; border-radius: var(--app-radius-sm);
  background: transparent; color: var(--app-fg-muted); font: inherit; font-weight: 500; font-size: 13px;
  cursor: pointer; transition: color .15s, background .15s;
}
.ws-tab:hover { color: var(--app-fg); }
.ws-tab.is-active { background: var(--app-bg); color: var(--app-fg); box-shadow: 0 1px 2px rgba(0,0,0,0.08); }
.ws-tab__icon { display: inline-flex; }
.ws-tab__icon svg { width: 13px; height: 13px; }

/* ── Buttons ────────────────────────────────────────────────────────── */
.app-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  height: 30px; padding: 0 10px; border: 1px solid transparent; border-radius: var(--app-radius-sm);
  background: transparent; color: var(--app-fg); font: inherit; font-size: 13px; font-weight: 500;
  cursor: pointer; position: relative; transition: background .15s, border-color .15s, opacity .15s;
  white-space: nowrap;
}
.app-btn svg { width: 15px; height: 15px; flex: none; }
.app-btn--icon { width: 30px; padding: 0; }
.app-btn--ghost:hover { background: var(--app-surface); }
.app-btn--primary { background: var(--app-accent); color: var(--app-accent-fg); }
.app-btn--primary:hover { filter: brightness(1.06); }
.app-btn--danger { background: var(--app-danger); color: #fff; }
.app-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.app-btn:focus-visible { outline: 2px solid var(--app-accent); outline-offset: 1px; }

.app-badge {
  position: absolute; top: -4px; right: -4px; min-width: 15px; height: 15px; padding: 0 3px;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 9px; font-weight: 600; line-height: 1; color: var(--app-accent-fg);
  background: var(--app-accent); border-radius: 8px; border: 1.5px solid var(--app-bg);
}

.app-stage { flex: 1; min-height: 0; overflow: hidden; display: flex; }

/* ── Overlays: modal + palette ──────────────────────────────────────── */
.modal-overlay {
  position: fixed; inset: 0; z-index: 100;
  display: flex; align-items: center; justify-content: center;
  background: rgba(10, 12, 16, 0.44); backdrop-filter: blur(2px);
}
.modal-overlay--top { align-items: flex-start; padding-top: 12vh; }

.export-modal {
  width: min(720px, 92vw); max-height: 84vh; display: flex; flex-direction: column;
  background: var(--app-bg); border: 1px solid var(--app-border); border-radius: 14px;
  box-shadow: var(--app-shadow-lg); overflow: hidden;
}
.export-modal__head { display: flex; align-items: center; padding: 14px 16px; border-bottom: 1px solid var(--app-border); }
.export-modal__title { margin: 0; font-size: 15px; font-weight: 600; flex: 1; }
.export-tabs { display: flex; gap: 4px; padding: 10px 16px 0; }
.export-tab { padding: 6px 12px; border: 0; border-radius: var(--app-radius-sm); background: transparent; color: var(--app-fg-muted); font: inherit; font-weight: 500; font-size: 13px; cursor: pointer; }
.export-tab:hover { background: var(--app-surface); color: var(--app-fg); }
.export-tab.is-active { background: var(--app-accent); color: var(--app-accent-fg); }
.export-pre { margin: 12px 16px; padding: 14px; overflow: auto; background: var(--app-surface); border: 1px solid var(--app-border); border-radius: 10px; max-height: 42vh; }
.export-code, .ds-css__code { font-family: var(--app-mono); font-size: 12.5px; line-height: 1.6; white-space: pre; }
.export-help { padding: 0 16px; }
.export-install { border: 1px solid var(--app-border); border-radius: 10px; overflow: hidden; }
.export-install summary { padding: 10px 14px; cursor: pointer; font-weight: 500; font-size: 13px; user-select: none; }
.export-install__body { padding: 0 14px 12px; font-size: 13px; color: var(--app-fg-muted); }
.export-install__body pre { overflow: auto; background: var(--app-surface); padding: 12px; border-radius: 8px; }
.export-install__body code { font-family: var(--app-mono); font-size: 12px; line-height: 1.6; }
.export-bar { display: flex; justify-content: flex-end; gap: 8px; padding: 14px 16px; border-top: 1px solid var(--app-border); }

/* ── Command palette ────────────────────────────────────────────────── */
.cmd-panel { width: min(560px, 92vw); background: var(--app-bg); border: 1px solid var(--app-border); border-radius: 12px; box-shadow: var(--app-shadow-lg); overflow: hidden; }
.cmd-search { padding: 8px; border-bottom: 1px solid var(--app-border); }
.cmd-input { width: 100%; height: 40px; padding: 0 12px; border: 0; background: transparent; color: var(--app-fg); font: inherit; font-size: 15px; outline: none; }
.cmd-list { list-style: none; margin: 0; padding: 6px; max-height: 50vh; overflow: auto; }
.cmd-item { display: flex; align-items: center; gap: 10px; padding: 9px 10px; border-radius: 8px; cursor: pointer; }
.cmd-item.is-active { background: var(--app-surface); }
.cmd-item__group { font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: .04em; color: var(--app-fg-muted); }
.cmd-item__title { font-size: 14px; }
.cmd-empty { padding: 16px; text-align: center; color: var(--app-fg-muted); }

/* ── Toast ──────────────────────────────────────────────────────────── */
.toast-stack { position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%); z-index: 200; display: flex; flex-direction: column; gap: 8px; align-items: center; }
.toast { padding: 9px 16px; border-radius: 999px; background: var(--app-fg); color: var(--app-bg); font-size: 13px; font-weight: 500; box-shadow: var(--app-shadow); opacity: 0; transform: translateY(8px); transition: opacity .2s, transform .2s; }
.toast.is-in { opacity: 1; transform: translateY(0); }
.toast--success { background: #16a34a; color: #fff; }
.toast--error { background: var(--app-danger); color: #fff; }

/* ── Syntax highlight ───────────────────────────────────────────────── */
.hl-comment { color: var(--app-fg-muted); font-style: italic; }
.hl-prop { color: #2563eb; }
.hl-val { color: #0f766e; }
.hl-sel { color: #b45309; }
.hl-num { color: #9333ea; }
.hl-str { color: #0f766e; }
.hl-kw { color: #b45309; font-weight: 500; }
:root[data-theme="dark"] .hl-prop { color: #7cb0ff; }
:root[data-theme="dark"] .hl-val { color: #4fd1c5; }
:root[data-theme="dark"] .hl-sel { color: #f0b866; }
:root[data-theme="dark"] .hl-num { color: #c792ea; }
:root[data-theme="dark"] .hl-str { color: #4fd1c5; }
:root[data-theme="dark"] .hl-kw { color: #f0b866; }

/* Responsive: stack workspace tabs tighter */
@media (max-width: 720px) {
  .app-brand__name { display: none; }
  .app-header__group--hide-sm { display: none; }
}