/* Studio 2-pane shared stylesheet — t2i / i2i / i2v / inpaint / lipsync */
:root {
  --bg: #0a0b0e;
  --bg-canvas: #050608;
  --surface: #131519;
  --surface-2: #1a1d23;
  --surface-3: #242830;
  --border: #21252c;
  --border-strong: #2d323b;
  --text: #e8eaed;
  --text-muted: #9aa0a6;
  --text-dim: #5f6368;
  --accent: #f0f1f3;
  --accent-hover: #ffffff;
  --accent-fg: #0a0b0e;
  --focus: #7dd3fc;
  --magenta: #e879c8;
  --success: #4ade80;
  --danger: #f87171;
  --radius: 8px;
  --radius-sm: 5px;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --bar-h: 52px;
  --params-w: 360px;
  --scroll-thumb: #2d323b;
  --scroll-thumb-hover: #3a4049;
  --scroll-track: #050608;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; padding: 0; background: var(--bg); color: var(--text); }
body {
  font-family: "Inter", "Noto Sans JP", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow: hidden;
}
::selection { background: rgba(125,211,252,.3); color: var(--text); }
* { scrollbar-color: var(--scroll-thumb) var(--scroll-track); scrollbar-width: thin; }
::-webkit-scrollbar { width: 12px; height: 12px; }
::-webkit-scrollbar-track { background: var(--scroll-track); }
::-webkit-scrollbar-thumb { background: var(--scroll-thumb); border: 3px solid var(--scroll-track); border-radius: 7px; }
::-webkit-scrollbar-thumb:hover { background: var(--scroll-thumb-hover); }
::-webkit-scrollbar-corner { background: var(--scroll-track); }
::placeholder { color: var(--text-dim); }

/* ─── Shell ────────────────────────────────────────── */
.app { height: 100vh; height: 100dvh; display: flex; flex-direction: column; }

.bar {
  flex: 0 0 var(--bar-h);
  height: var(--bar-h);
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  display: flex; align-items: center;
  padding: 0 1.25rem;
  gap: 1rem;
}
.bar .brand { display: inline-flex; align-items: center; gap: .65rem; }
.bar .dot { width: 8px; height: 8px; background: var(--magenta); border-radius: 50%; flex-shrink: 0; box-shadow: 0 0 12px rgba(232,121,200,.45); }
.bar .brand-name { font-size: 1rem; font-weight: 600; letter-spacing: -.01em; }
.bar .brand-tag {
  font-family: var(--mono);
  font-size: .68rem;
  color: var(--text-dim);
  letter-spacing: .14em;
  text-transform: uppercase;
  padding-left: .85rem;
  margin-left: .15rem;
  border-left: 1px solid var(--border);
}

.workspace {
  flex: 1; min-height: 0;
  display: grid;
  grid-template-columns: 1fr var(--params-w);
}
.canvas-pane {
  overflow-y: auto;
  padding: 1.5rem 1.75rem 2rem;
  display: flex; flex-direction: column; gap: 1rem;
  background: var(--bg);
  min-height: 0;
}
.params-pane {
  overflow-y: auto;
  border-left: 1px solid var(--border);
  background: var(--surface);
  padding: 1.5rem 1.5rem 2rem;
}
@media (max-width: 900px) {
  body { overflow: auto; }
  .app { height: auto; min-height: 100vh; }
  .workspace { grid-template-columns: 1fr; }
  .params-pane { border-left: 0; border-top: 1px solid var(--border); }
  .canvas-pane, .params-pane { overflow-y: visible; }
}

/* ─── Common controls ───────────────────────────────── */
.pane-row { display: flex; align-items: center; gap: .65rem; flex-wrap: wrap; }

input[type=file]:not(.file-drop input) {
  padding: .35rem .55rem;
  color: var(--text-muted); cursor: pointer;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: .82rem; font-family: inherit;
}
input[type=file]::file-selector-button {
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: .3rem .75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  margin-right: .7rem;
  font-family: inherit; font-size: .8rem;
  transition: background .12s, border-color .12s;
}
input[type=file]::file-selector-button:hover {
  background: var(--surface-3); border-color: var(--border-strong);
}

/* Drop-zone style file input wrapper (i2i / i2v / lipsync) */
.file-drop {
  display: flex; align-items: center; gap: .65rem;
  padding: .55rem .8rem;
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--surface);
  cursor: pointer;
  font-size: .85rem;
  transition: border-color .12s, background .12s;
  flex: 1;
}
.file-drop:hover { border-color: var(--focus); background: var(--surface-2); }
.file-drop input { display: none; }
.file-drop .filename { flex: 1; color: var(--text-dim); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-drop.has-file .filename { color: var(--text); }
.file-drop .icon { width: 1rem; height: 1rem; color: var(--text-dim); flex-shrink: 0; }
.file-drop:hover .icon { color: var(--focus); }

/* ─── Section label ("Source" / "Result" headers) ─── */
.canvas-section-label {
  font-family: var(--mono);
  font-size: .66rem;
  color: var(--text-dim);
  letter-spacing: .14em;
  text-transform: uppercase;
  margin: .25rem 0 -.35rem;
  padding: 0 .15rem;
  display: flex;
  align-items: center;
  gap: .55rem;
  font-weight: 600;
}
.canvas-section-label::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
}
.canvas-section-label .dot-magenta {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--magenta);
  flex-shrink: 0;
  box-shadow: 0 0 8px rgba(232,121,200,.4);
}

/* ─── Zoomable viewport (used by all 5 apps) ───────── */
.canvas-viewport {
  flex: 1;
  align-self: stretch;
  min-height: 360px;
  position: relative;
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background:
    radial-gradient(circle at 50% 40%, rgba(232,121,200,.06), transparent 60%),
    var(--bg-canvas);
  display: flex;
  box-shadow: 0 8px 32px rgba(0,0,0,.35);
  scrollbar-color: var(--scroll-thumb) var(--scroll-track);
}
.canvas-viewport::-webkit-scrollbar { width: 12px; height: 12px; }
.canvas-viewport::-webkit-scrollbar-track { background: var(--scroll-track); }
.canvas-viewport::-webkit-scrollbar-thumb {
  background: var(--scroll-thumb);
  border: 3px solid var(--scroll-track);
  border-radius: 7px;
}
.canvas-viewport::-webkit-scrollbar-thumb:hover { background: var(--scroll-thumb-hover); }
.canvas-viewport::-webkit-scrollbar-corner { background: var(--scroll-track); }

.canvas-viewport.empty {
  border-style: dashed;
  border-color: var(--border-strong);
  box-shadow: none;
}
.canvas-viewport .empty-state {
  margin: auto;
  text-align: center;
  color: var(--text-dim);
  font-size: .9rem;
  padding: 2rem;
}
.canvas-viewport .empty-state .empty-icon,
.canvas-viewport .empty-state .placeholder-icon {
  font-size: 1.6rem;
  color: var(--magenta);
  opacity: .55;
  margin-bottom: .85rem;
  font-family: var(--mono);
  display: block;
}

.canvas-stage {
  margin: auto;
  position: relative;
  flex-shrink: 0;
  /* width / height set by JS = naturalSize * zoom */
}
.canvas-stage > img,
.canvas-stage > video {
  width: 100%;
  height: 100%;
  display: block;
  background: var(--bg-canvas);
}
.canvas-stage > video { object-fit: contain; }

/* Inpaint stage: base img + mask canvas overlay */
.canvas-stage.inpaint { user-select: none; -webkit-user-select: none; }
.canvas-stage.inpaint img.base {
  width: 100%; height: 100%;
  display: block;
  pointer-events: none;
}
.canvas-stage.inpaint canvas.mask {
  position: absolute;
  left: 0; top: 0;
  width: 100%; height: 100%;
  cursor: crosshair;
  touch-action: none;
}

/* ─── Zoom bar ─────────────────────────────────────── */
.zoom-bar {
  display: flex; align-items: center;
  gap: .35rem;
  padding: .4rem .55rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--mono);
  font-size: .74rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}
.zoom-bar .zoom-label {
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-right: .15rem;
  padding-left: .15rem;
}
.zoom-bar .zoom-btn {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: .3rem .6rem;
  font-family: inherit;
  font-size: .76rem;
  cursor: pointer;
  transition: background .12s, border-color .12s;
  min-width: 30px;
  line-height: 1;
}
.zoom-bar .zoom-btn:hover { background: var(--surface-2); border-color: var(--border-strong); }
.zoom-bar .zoom-btn:active { transform: translateY(1px); }
.zoom-bar .zoom-val {
  min-width: 56px;
  text-align: center;
  color: var(--text);
  font-feature-settings: "tnum";
  padding: 0 .35rem;
}
.zoom-bar .zoom-hint {
  color: var(--text-dim);
  font-size: .72rem;
  white-space: nowrap;
}
.zoom-bar .zoom-spacer { flex: 1; min-width: .25rem; }
.zoom-bar .zoom-divider {
  width: 1px; height: 18px;
  background: var(--border);
  margin: 0 .15rem;
}
.zoom-bar a.btn,
.zoom-bar button.btn {
  font-family: inherit;
}

/* ─── Inpaint tools ─────────────────────────────────── */
.canvas-tools {
  display: flex; flex-wrap: wrap;
  gap: .4rem; align-items: center;
  padding: .5rem .55rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.canvas-tools .group {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .25rem .65rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
.canvas-tools .spacer { flex: 1; min-width: .25rem; }
.canvas-tools input[type=range] { width: 96px; accent-color: var(--magenta); }
.canvas-tools small {
  color: var(--text-muted);
  font-size: .74rem;
  font-family: var(--mono);
  font-feature-settings: "tnum";
}

/* Standalone result-card (used by inpaint when result is below tools) */
.result-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem 1.25rem;
}
.result-card h3 {
  margin: 0 0 .85rem;
  font-size: .68rem; text-transform: uppercase;
  letter-spacing: .14em;
  color: var(--magenta);
  font-weight: 600;
  display: flex; align-items: center; gap: .5rem;
}
.result-card h3::after {
  content: ""; flex: 1; height: 1px;
  background: var(--border);
}
.result-card img,
.result-card video {
  width: 100%;
  max-height: 70vh;
  object-fit: contain;
  border-radius: var(--radius-sm);
  background: var(--bg-canvas);
  display: block;
}

/* ─── Params pane ───────────────────────────────────── */
.params-pane h3 {
  font-size: .68rem;
  text-transform: uppercase;
  letter-spacing: .14em;
  color: var(--text-dim);
  font-weight: 600;
  margin: 0 0 .85rem;
  display: flex; align-items: center; gap: .5rem;
}
.params-pane h3::after {
  content: ""; flex: 1; height: 1px;
  background: var(--border);
}
.params-pane .section { margin-bottom: 1.6rem; }
.params-pane .section:last-of-type { margin-bottom: 1rem; }

label.field {
  display: block;
  font-weight: 500; font-size: .78rem;
  color: var(--text-muted);
  margin: .85rem 0 .35rem;
}
label.field:first-of-type { margin-top: 0; }
label.field .hint {
  font-weight: 400;
  color: var(--text-dim);
  font-size: .72rem;
  margin-left: .4rem;
}

textarea {
  width: 100%; padding: .6rem .75rem;
  font-size: .88rem; font-family: inherit;
  color: var(--text); background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  line-height: 1.55;
  min-height: 4rem;
  resize: vertical;
  transition: border-color .12s;
}
textarea:focus { outline: none; border-color: var(--focus); }

select, input[type=number], input[type=text] {
  width: 100%;
  padding: .5rem .75rem;
  font-size: .88rem; font-family: inherit;
  color: var(--text); background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: border-color .12s;
}
select:focus, input[type=number]:focus, input[type=text]:focus {
  outline: none; border-color: var(--focus);
}
input[type=number] { font-family: var(--mono); font-feature-settings: "tnum"; }
select {
  appearance: none; -webkit-appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 10 10'><path d='M2.5 4L5 6.5L7.5 4' stroke='%239aa0a6' stroke-width='1.3' fill='none' stroke-linecap='round' stroke-linejoin='round'/></svg>");
  background-repeat: no-repeat;
  background-position: right .55rem center;
  padding-right: 1.65rem;
}

.param-row {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: .65rem;
  align-items: center;
  margin-bottom: .55rem;
}
.param-row label {
  font-size: .78rem;
  color: var(--text-muted);
  font-weight: 500;
  margin: 0;
}
.param-row select, .param-row input[type=number] {
  padding: .45rem .65rem;
  font-size: .82rem;
}

/* Slider row (i2i) */
.slider-row { display: flex; align-items: center; gap: .55rem; }
.slider-row input[type=range] { flex: 1; accent-color: var(--magenta); }
.slider-row .val {
  font-family: var(--mono); font-feature-settings: "tnum";
  color: var(--text);
  width: 2.4rem; text-align: right;
  font-size: .82rem;
}

/* Radio group (lipsync) */
.radio-group {
  display: inline-flex; flex-wrap: wrap;
  gap: .65rem; align-items: center;
}
.radio-group label {
  display: inline-flex; align-items: center; gap: .25rem;
  font-size: .78rem; color: var(--text);
  cursor: pointer;
  font-weight: 400; margin: 0;
}
.radio-group input { accent-color: var(--magenta); margin: 0; }

/* Size row (t2i: width × height) */
.size-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: .35rem;
  align-items: center;
}
.size-row .x {
  color: var(--text-dim);
  font-weight: 500;
  text-align: center;
  font-family: var(--mono);
}
.size-row input[type=number] { padding: .45rem .55rem; font-size: .82rem; text-align: center; }

/* ─── Buttons ───────────────────────────────────────── */
.btn {
  background: var(--accent); color: var(--accent-fg);
  border: 1px solid var(--accent);
  padding: .55rem 1.1rem; border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: .85rem; font-weight: 600;
  font-family: inherit; letter-spacing: -.005em;
  transition: background .12s, border-color .12s, transform .04s, color .12s;
  text-decoration: none;
}
.btn:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .35; cursor: not-allowed; }
.btn.secondary {
  background: transparent; color: var(--text);
  border-color: var(--border-strong);
  font-weight: 500;
}
.btn.secondary:hover { background: var(--surface-2); border-color: var(--surface-3); }
.canvas-tools .btn.secondary { padding: .35rem .85rem; font-size: .78rem; }
.btn.block {
  width: 100%;
  padding: .8rem 1rem;
  font-size: .92rem;
  margin-top: .65rem;
  display: flex; align-items: center; justify-content: center; gap: .55rem;
}
.btn.block::before {
  content: ""; width: 6px; height: 6px;
  background: var(--magenta); border-radius: 50%;
}
.btn.download {
  display: inline-flex; align-items: center; gap: .4rem;
  padding: .35rem .85rem;
  font-size: .78rem; font-weight: 500;
  background: transparent; color: var(--text);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-family: inherit;
  cursor: pointer;
  text-decoration: none;
  transition: background .12s, border-color .12s;
}
.btn.download:hover { background: var(--surface-2); border-color: var(--surface-3); }

/* ─── Status ────────────────────────────────────────── */
.status {
  padding: .65rem .95rem;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: .82rem; color: var(--text-muted);
  font-family: var(--mono); font-feature-settings: "tnum";
}
.status.error { background: rgba(248,113,113,.07); border-color: rgba(248,113,113,.3); color: #fca5a5; }
.status.success { background: rgba(74,222,128,.07); border-color: rgba(74,222,128,.3); color: #86efac; }
.status.running {
  background: rgba(125,211,252,.06);
  border-color: rgba(125,211,252,.3);
  color: #bae6fd;
}
.status.running::after {
  content: ""; display: inline-block;
  width: 6px; height: 6px; margin-left: .5rem;
  background: var(--focus); border-radius: 50%;
  animation: pulse 1.4s ease-in-out infinite;
  vertical-align: middle;
}
@keyframes pulse { 0%,100% { opacity: .25; } 50% { opacity: 1; } }

/* ─── Hub page (studio.ikachi.org) ──────────────────── */
.hub-app {
  height: 100vh; height: 100dvh;
  display: grid;
  grid-template-columns: 300px 1fr;
}
.hub-sidebar {
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 1.5rem 1.1rem 1.25rem;
  display: flex; flex-direction: column;
  overflow-y: auto;
}
.hub-brand {
  display: flex; align-items: center; gap: .7rem;
  padding: 0 .35rem 1.4rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.1rem;
}
.hub-brand .dot {
  width: 10px; height: 10px;
  background: var(--magenta); border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 14px rgba(232,121,200,.5);
}
.hub-brand-name { font-size: 1.05rem; font-weight: 700; letter-spacing: -.01em; }
.hub-brand-tag {
  font-family: var(--mono); font-size: .65rem;
  color: var(--text-dim); letter-spacing: .14em;
  text-transform: uppercase; margin-top: .15rem;
}
.hub-nav { flex: 1; display: flex; flex-direction: column; gap: .25rem; }
.hub-nav-section {
  font-family: var(--mono); font-size: .62rem;
  color: var(--text-dim); letter-spacing: .14em;
  text-transform: uppercase;
  padding: .5rem .55rem .35rem;
}
.hub-nav-item {
  display: grid; grid-template-columns: 28px 1fr;
  align-items: center; gap: .6rem;
  padding: .6rem .65rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
  color: var(--text);
  border: 1px solid transparent;
  transition: background .12s, border-color .12s;
  background: none;
  font: inherit;
  text-align: left;
  width: 100%;
}
.hub-nav-item:hover { background: var(--surface-2); }
.hub-nav-item.active { background: var(--surface-2); border-color: var(--border-strong); }
.hub-nav-item.active .hub-nav-icon { color: var(--magenta); }
.hub-nav-icon {
  font-family: var(--mono); font-size: 1rem;
  color: var(--text-dim); text-align: center; line-height: 1;
}
.hub-nav-text { display: flex; flex-direction: column; gap: .12rem; min-width: 0; }
.hub-nav-label { font-size: .92rem; font-weight: 600; letter-spacing: -.005em; }
.hub-nav-sub { font-size: .72rem; color: var(--text-muted); }

.hub-status {
  margin-top: 1rem;
  padding: .9rem .55rem;
  border-top: 1px solid var(--border);
}
.hub-status-title {
  font-family: var(--mono); font-size: .62rem;
  color: var(--text-dim); letter-spacing: .14em;
  text-transform: uppercase; margin-bottom: .5rem;
}
.hub-status-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: .25rem 0;
  font-family: var(--mono); font-size: .76rem;
  color: var(--text-muted);
  font-feature-settings: "tnum";
}
.hub-status-row .ok {
  color: var(--success);
  display: inline-flex; align-items: center; gap: .35rem;
}
.hub-status-row .ok::before {
  content: ""; width: 6px; height: 6px;
  border-radius: 50%; background: var(--success);
  box-shadow: 0 0 8px rgba(74,222,128,.5);
}

.hub-content {
  background: var(--bg);
  padding: 2.25rem 2.5rem 2rem;
  overflow-y: auto;
  display: flex; flex-direction: column;
}
.hub-content-head { margin-bottom: 1.75rem; }
.hub-eyebrow {
  font-family: var(--mono); font-size: .68rem;
  color: var(--magenta); letter-spacing: .14em;
  text-transform: uppercase; font-weight: 600;
}
.hub-content-head h1 {
  font-size: 2.4rem; font-weight: 700;
  margin: .25rem 0 .35rem;
  letter-spacing: -.02em;
}
.hub-content-tag { font-size: .95rem; color: var(--text-muted); }

.hub-preview {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 1.5rem;
  margin-bottom: 2rem;
}
.hub-thumb {
  height: 200px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background:
    radial-gradient(circle at 40% 30%, rgba(232,121,200,.18), transparent 65%),
    radial-gradient(circle at 80% 80%, rgba(125,211,252,.1), transparent 65%),
    var(--bg-canvas);
  display: flex; align-items: center; justify-content: center;
  position: relative; overflow: hidden;
}
.hub-thumb-icon {
  font-family: var(--mono); font-size: 5rem;
  color: var(--magenta); opacity: .55;
  line-height: 1; font-weight: 400;
}

.hub-meta { display: flex; flex-direction: column; gap: .55rem; padding-top: .25rem; }
.hub-meta-row {
  display: grid; grid-template-columns: 90px 1fr;
  gap: 1rem; align-items: baseline;
  padding: .55rem 0;
  border-bottom: 1px solid var(--border);
}
.hub-meta-row:last-child { border-bottom: 0; }
.hub-meta-key {
  font-family: var(--mono); font-size: .68rem;
  letter-spacing: .14em; text-transform: uppercase;
  color: var(--text-dim);
}
.hub-meta-val { font-size: .9rem; color: var(--text); font-weight: 500; }
.hub-meta-val.mono {
  font-family: var(--mono);
  font-feature-settings: "tnum";
  font-size: .85rem;
}

.hub-section { margin-bottom: 1.6rem; }
.hub-section h3 {
  font-family: var(--mono); font-size: .68rem;
  color: var(--text-dim); letter-spacing: .14em;
  text-transform: uppercase;
  margin: 0 0 .85rem;
  display: flex; align-items: center; gap: .55rem;
}
.hub-section h3::after { content: ""; flex: 1; height: 1px; background: var(--border); }
.hub-section ul {
  margin: 0; padding-left: 1.1rem;
  color: var(--text); font-size: .92rem; line-height: 1.85;
}
.hub-section ul li::marker { color: var(--magenta); }

.hub-actions {
  margin-top: auto; padding-top: 1.5rem;
  display: flex; gap: .75rem; align-items: center;
}
.hub-open {
  display: inline-flex; align-items: center; gap: .55rem;
  background: var(--accent); color: var(--accent-fg);
  border: 1px solid var(--accent);
  padding: .8rem 1.5rem; border-radius: var(--radius-sm);
  font-size: .92rem; font-weight: 600;
  letter-spacing: -.005em;
  cursor: pointer; text-decoration: none;
  transition: background .12s, transform .04s;
}
.hub-open:hover { background: var(--accent-hover); }
.hub-open .arrow { font-family: var(--mono); font-size: 1rem; }
.hub-open-sub {
  color: var(--text-dim); font-size: .8rem;
  font-family: var(--mono);
}

@media (max-width: 900px) {
  .hub-app { grid-template-columns: 1fr; height: auto; min-height: 100vh; }
  .hub-sidebar { border-right: 0; border-bottom: 1px solid var(--border); }
  .hub-content { padding: 1.5rem 1.25rem; }
  .hub-preview { grid-template-columns: 1fr; }
  body { overflow: auto; }
}