/* ============================================================
   SandTrace — "Atelier"
   A gallery for kinetic sand drawings.
   Display: Fraunces · UI: Space Grotesk · Readouts: JetBrains Mono
   ============================================================ */

:root {
  /* Paper & ink */
  --paper:        #ece3d2;
  --paper-raised: #f5efe2;
  --paper-sunken: #e2d7c0;
  --ink:          #221c14;
  --ink-2:        #6c6151;
  --ink-3:        #9a8e79;

  /* Hairlines */
  --line:        rgba(34, 28, 20, 0.13);
  --line-strong: rgba(34, 28, 20, 0.26);

  /* Accent — terracotta clay */
  --clay:        #b24a26;
  --clay-deep:   #8f3917;
  --clay-soft:   rgba(178, 74, 38, 0.10);

  /* The sand bowl */
  --sand-hi:   #e8dcc1;
  --sand-mid:  #d9c8a4;
  --sand-lo:   #c4ad81;
  --groove:    #6a4a2c;   /* engraved drawing line */
  --groove-2:  #9a6f43;   /* outline / lighter pass */
  --travel:    rgba(106, 74, 44, 0.28);
  --steel:     #5c5650;

  --radius: 7px;
  --radius-lg: 12px;

  --display: "Fraunces", Georgia, serif;
  --ui: "Space Grotesk", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out: cubic-bezier(0.4, 0, 1, 1);
}

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

@keyframes view-in {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes float-y {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-6px); }
}
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes draw-rotate { to { transform: rotate(360deg); } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

body {
  margin: 0;
  min-height: 100dvh;
  font-family: var(--ui);
  font-size: 15px;
  color: var(--ink);
  background-color: var(--paper);
  /* faint paper grain */
  background-image:
    radial-gradient(circle at 18% 12%, rgba(255,255,255,0.35), transparent 45%),
    radial-gradient(circle at 85% 88%, rgba(120,90,50,0.06), transparent 50%),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
  background-attachment: fixed;
  -webkit-tap-highlight-color: transparent;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.app { min-height: 100dvh; }

.hidden { display: none !important; }

/* ---------- Eyebrows (mono kickers) ---------- */
.step-eyebrow,
.empty-eyebrow {
  font-family: var(--mono);
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--clay);
  margin: 0 0 0.5rem;
}

/* ---------- Topbar ---------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 1.1rem 2rem;
  padding-top: max(1.1rem, env(safe-area-inset-top));
  padding-left: max(2rem, env(safe-area-inset-left));
  padding-right: max(2rem, env(safe-area-inset-right));
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(10px);
}

.brand { display: flex; align-items: center; gap: 0.85rem; }
.brand-mark { flex-shrink: 0; line-height: 0; }
.brand-mark .mark-ring   { fill: none; stroke: var(--ink); stroke-width: 1.25; }
.brand-mark .mark-inner  { fill: none; stroke: var(--line-strong); stroke-width: 0.75; }
.brand-mark .mark-ball   { fill: var(--clay); }

.brand h1 {
  margin: 0;
  font-family: var(--display);
  font-optical-sizing: auto;
  font-size: 1.45rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--ink);
  line-height: 1;
}
.brand p {
  margin: 0.15rem 0 0;
  font-size: 0.74rem;
  color: var(--ink-2);
  letter-spacing: 0.01em;
}

/* ---------- Buttons ---------- */
.upload-btn,
.primary-btn,
.secondary-btn {
  font-family: var(--ui);
  font-size: 0.86rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  border-radius: var(--radius);
  min-height: 44px;
  cursor: pointer;
  text-decoration: none;
  border: 1px solid transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.6rem 1.2rem;
  transition: background 0.18s var(--ease), color 0.18s var(--ease),
              border-color 0.18s var(--ease), transform 0.12s var(--ease),
              box-shadow 0.18s var(--ease);
}
.upload-btn:active,
.primary-btn:active,
.secondary-btn:active { transform: scale(0.97); }

.upload-btn,
.primary-btn {
  background: var(--clay);
  color: #fbf3e8;
  box-shadow: 0 1px 0 rgba(0,0,0,0.06), inset 0 1px 0 rgba(255,255,255,0.12);
}
.upload-btn:hover,
.primary-btn:hover { background: var(--clay-deep); }
.primary-btn:disabled { opacity: 0.4; cursor: not-allowed; transform: none; box-shadow: none; }

.primary-btn.saved { background: #5d7a4a; }
.primary-btn.saved .btn-label::before { content: "✓ "; }

.secondary-btn {
  background: transparent;
  color: var(--ink);
  border-color: var(--line-strong);
}
.secondary-btn:hover { border-color: var(--ink); background: rgba(34,28,20,0.03); }

.link-btn {
  background: none;
  border: none;
  color: var(--clay);
  font-family: var(--ui);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0;
  letter-spacing: 0.01em;
}
.link-btn:hover { color: var(--clay-deep); }

.ghost-btn {
  width: 100%;
  margin-top: 0.9rem;
  padding: 0.7rem;
  border-radius: var(--radius);
  border: 1px dashed var(--line-strong);
  background: transparent;
  color: var(--ink-2);
  font-family: var(--ui);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: color 0.15s var(--ease), border-color 0.15s var(--ease), background 0.15s var(--ease);
}
.ghost-btn:hover { color: var(--ink); border-color: var(--ink-2); background: rgba(34,28,20,0.02); }
.ghost-btn::after { content: " +"; font-family: var(--mono); opacity: 0.7; }
.ghost-btn[aria-expanded="true"]::after { content: " –"; }

/* ---------- Empty state ---------- */
.empty-state {
  animation: view-in 0.5s var(--ease) both;
  display: grid;
  place-items: center;
  min-height: calc(100dvh - 78px);
  padding: 2rem;
}
.empty-drop {
  width: min(560px, 100%);
  padding: 3.5rem 2.5rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--paper-raised);
  box-shadow: 0 1px 2px rgba(34,28,20,0.04), 0 18px 50px -28px rgba(34,28,20,0.3);
  text-align: center;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}
.empty-drop:hover,
.empty-drop.dragover {
  border-color: var(--clay);
  box-shadow: 0 1px 2px rgba(34,28,20,0.05), 0 24px 60px -28px rgba(178,74,38,0.4);
}
.empty-drop.dragover { transform: scale(1.01); }

.empty-illu { line-height: 0; margin-bottom: 1.5rem; animation: float-y 5s ease-in-out infinite; }
.empty-ring        { fill: none; stroke: var(--ink); stroke-width: 1; opacity: 0.55; }
.empty-ring-inner  { fill: none; stroke: var(--line-strong); stroke-width: 0.75; }
.empty-ball        { fill: var(--clay); transform-origin: 40px 40px; animation: draw-rotate 7s linear infinite; }

.empty-title {
  margin: 0;
  font-family: var(--display);
  font-optical-sizing: auto;
  font-size: 2rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.empty-sub {
  margin: 0.75rem 0 1.75rem;
  max-width: 30rem;
  color: var(--ink-2);
  font-size: 0.95rem;
  line-height: 1.5;
}
.empty-cta { min-width: 200px; background: var(--clay); color: #fbf3e8; font-weight: 600;
  padding: 0.75rem 1.5rem; border-radius: var(--radius); transition: background 0.15s var(--ease), transform 0.12s var(--ease); }
.empty-drop:hover .empty-cta { background: var(--clay-deep); }
.empty-drop:active .empty-cta { transform: scale(0.97); }
.empty-hint { margin-top: 0.85rem; font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.08em; color: var(--ink-3); }

.empty-error { margin: 1rem 0 0; color: var(--clay-deep); font-size: 0.85rem; text-align: center; }

/* ============================================================
   Mode picker (Step 1)
   ============================================================ */
.mode-picker {
  animation: view-in 0.45s var(--ease) both;
  max-width: 1040px;
  margin: 0 auto;
  height: calc(100dvh - 82px);
  padding: 1.5rem 2rem;
  padding-left: max(2rem, env(safe-area-inset-left));
  padding-right: max(2rem, env(safe-area-inset-right));
  display: flex;
  flex-direction: column;
}
.mode-picker-head { text-align: center; margin-bottom: 1.25rem; flex: none; }
.mode-picker-head .step-eyebrow { margin-bottom: 0.35rem; }
.mode-picker-head h2 {
  margin: 0 0 0.4rem;
  font-family: var(--display);
  font-optical-sizing: auto;
  font-size: 1.85rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.mode-picker-sub { margin: 0 auto; max-width: 34rem; color: var(--ink-2); font-size: 0.9rem; line-height: 1.5; }
.mode-picker-file { margin: 0.5rem 0 0; font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.05em; color: var(--ink-3); }

.mode-error {
  grid-column: 1 / -1;
  text-align: center;
  padding: 2.5rem 1rem;
  color: var(--ink-2);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
}
.mode-error p { margin: 0; }
.mode-error-detail { font-family: var(--mono); font-size: 0.72rem; color: var(--ink-3); }
.mode-error .primary-btn { margin-top: 0.4rem; min-width: 160px; }

.mode-picker-loading {
  flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 0.85rem; color: var(--ink-2); font-size: 0.85rem;
}

.mode-grid {
  flex: 1; min-height: 0;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.1rem;
}

.mode-card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 0;
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 0.5rem;
  cursor: pointer;
  text-align: left;
  font-family: var(--ui);
  color: inherit;
  transition: border-color 0.18s var(--ease), box-shadow 0.18s var(--ease), transform 0.18s var(--ease);
}
.mode-card:hover { border-color: var(--line-strong); transform: translateY(-2px);
  box-shadow: 0 16px 40px -24px rgba(34,28,20,0.4); }
.mode-card.selected {
  border-color: var(--clay);
  box-shadow: 0 0 0 1px var(--clay), 0 16px 40px -22px rgba(178,74,38,0.5);
}
.mode-card-preview {
  flex: 1;
  min-height: 0;
  background:
    radial-gradient(circle at 50% 42%, var(--sand-hi), var(--sand-mid) 70%, var(--sand-lo) 100%);
  border-radius: 9px;
  overflow: hidden;
  box-shadow: inset 0 1px 6px rgba(90,60,30,0.18);
}
.mode-card-preview svg { width: 100%; height: 100%; display: block; }
.mode-card-preview svg path.contour {
  fill: none; stroke: var(--groove); stroke-width: 1.4; stroke-linecap: round; stroke-linejoin: round;
}
.mode-card-body { flex: none; padding: 0.65rem 0.6rem 0.4rem; }
.mode-card-suggested {
  display: inline-block; font-family: var(--mono); font-size: 0.6rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.12em; color: var(--clay); margin-bottom: 0.3rem;
}
.mode-card-title {
  margin: 0 0 0.2rem; font-family: var(--display); font-size: 1.05rem; font-weight: 500; color: var(--ink);
}
.mode-card-desc { margin: 0 0 0.4rem; font-size: 0.76rem; color: var(--ink-2); line-height: 1.4; }
.mode-card-meta { margin: 0; font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.04em; color: var(--ink-3); }

.mode-picker-actions { flex: none; display: flex; flex-direction: column; align-items: center; gap: 0.6rem; margin-top: 1.25rem; }
.mode-picker-actions .primary-btn { min-width: min(100%, 300px); }

/* ============================================================
   Workspace (Step 2)
   ============================================================ */
.workspace {
  animation: view-in 0.45s var(--ease) both;
  max-width: 1320px;
  margin: 0 auto;
  padding: 2rem;
  padding-left: max(2rem, env(safe-area-inset-left));
  padding-right: max(2rem, env(safe-area-inset-right));
  padding-bottom: max(2rem, env(safe-area-inset-bottom));
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 2.5rem;
  align-items: start;
}

.stage {
  position: sticky;
  top: calc(env(safe-area-inset-top, 0px) + 100px);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  min-width: 0;
}
.stage-bar { display: flex; align-items: center; gap: 1rem; }

.back-btn {
  display: inline-flex; align-items: center; gap: 0.35rem;
  background: var(--paper-raised);
  border: 1px solid var(--line);
  color: var(--ink-2);
  font-family: var(--ui); font-size: 0.78rem; font-weight: 600; cursor: pointer;
  padding: 0.4rem 0.85rem 0.4rem 0.7rem;
  border-radius: 999px;
  min-height: 36px;
  transition: color 0.15s var(--ease), border-color 0.15s var(--ease),
              background 0.15s var(--ease), transform 0.12s var(--ease);
}
.back-btn svg { transition: transform 0.15s var(--ease); }
.back-btn:hover { color: var(--ink); border-color: var(--line-strong); background: rgba(34,28,20,0.03); }
.back-btn:hover svg { transform: translateX(-2px); }
.back-btn:active { transform: scale(0.97); }

/* live status indicator (replaces tabs) */
.stage-state {
  display: inline-flex; align-items: center; gap: 0.45rem;
  font-family: var(--mono); font-size: 0.66rem; font-weight: 500;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-2);
}
.stage-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--ink-3);
  transition: background 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.stage[data-view="outline"] .stage-dot {
  background: var(--groove-2);
  box-shadow: 0 0 0 3px rgba(154,111,67,0.18);
}
.stage[data-view="path"] .stage-dot {
  background: var(--clay);
  box-shadow: 0 0 0 3px var(--clay-soft);
}
.stage.is-building .stage-dot { animation: pulse-dot 1.1s ease-in-out infinite; }
@keyframes pulse-dot { 50% { opacity: 0.35; } }

.stage-caption {
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.04em;
  color: var(--ink-2); white-space: nowrap;
}

/* compact download button in the stage corner */
.download-btn {
  margin-left: auto;
  display: inline-flex; align-items: center; gap: 0.4rem;
  background: var(--clay); color: #fbf3e8;
  border: none; border-radius: 999px;
  font-family: var(--ui); font-size: 0.78rem; font-weight: 600;
  padding: 0.42rem 0.95rem; min-height: 36px; cursor: pointer;
  box-shadow: 0 1px 0 rgba(0,0,0,0.06), inset 0 1px 0 rgba(255,255,255,0.14);
  transition: background 0.15s var(--ease), transform 0.12s var(--ease), opacity 0.15s var(--ease);
  flex-shrink: 0;
}
.download-btn:hover { background: var(--clay-deep); }
.download-btn:active { transform: scale(0.96); }
.download-btn:disabled { opacity: 0.38; cursor: not-allowed; }
.download-btn.saved { background: #5d7a4a; }
.download-btn .dl-icon, .download-btn .dl-check { flex-shrink: 0; }
.download-btn .dl-check { display: none; }
.download-btn.saved .dl-icon { display: none; }
.download-btn.saved .dl-check { display: inline; }
.download-btn .btn-spinner { width: 13px; height: 13px; }

/* ---------- The sand bowl (hero) ---------- */
.sand-table-wrap {
  position: relative;
  aspect-ratio: 1;
  width: min(100%, 68vh);
  margin: 0 auto;
  border-radius: 50%;
  overflow: hidden;
  background:
    radial-gradient(circle at 50% 50%,
      var(--sand-hi) 0%, var(--sand-mid) 58%, var(--sand-lo) 100%);
  box-shadow:
    inset 0 2px 14px rgba(120,84,42,0.28),
    inset 0 -8px 30px rgba(90,60,28,0.22),
    0 30px 70px -40px rgba(34,28,20,0.55);
  border: 1px solid var(--line-strong);
}
/* raked concentric rings + machined rim */
.sand-table-wrap::before {
  content: "";
  position: absolute; inset: 0; border-radius: 50%;
  background:
    repeating-radial-gradient(circle at 50% 50%,
      rgba(255,250,240,0.06) 0px,
      rgba(255,250,240,0.06) 1px,
      rgba(110,74,44,0.05) 2px,
      rgba(110,74,44,0.05) 3px,
      transparent 3px, transparent 9px);
  opacity: 0.6;
  pointer-events: none;
}
.sand-table-wrap::after {
  content: "";
  position: absolute; inset: 0; border-radius: 50%;
  box-shadow: inset 0 0 0 1px rgba(255,250,240,0.25), inset 0 0 60px rgba(90,60,28,0.18);
  pointer-events: none;
}

#path-canvas, #outline-canvas {
  position: absolute; inset: 0; width: 100%; height: 100%; display: block;
  transition: opacity 0.32s var(--ease);
}
.stage[data-view="outline"] #path-canvas { opacity: 0; pointer-events: none; }
.stage[data-view="path"] #outline-canvas { opacity: 0; pointer-events: none; }
.stage[data-view="outline"] #trace-controls { display: none !important; }

.table-ring { fill: none; stroke: rgba(106,74,44,0.18); stroke-width: 1; }

/* engraved groove look */
#path-canvas path.layer-draw,
#path-canvas path.path {
  fill: none; stroke: var(--groove); stroke-width: 2.4;
  stroke-linecap: round; stroke-linejoin: round;
  filter: drop-shadow(0 0.6px 0 rgba(255,250,240,0.5));
}
#path-canvas path.layer-outline {
  fill: none; stroke: var(--groove-2); stroke-width: 2;
  stroke-linecap: round; stroke-linejoin: round;
}
#path-canvas path.layer-navigate {
  fill: none; stroke: var(--travel); stroke-width: 1.4;
  stroke-dasharray: 1 5; stroke-linecap: round;
}
#path-canvas circle.trace-ball {
  filter: drop-shadow(0 2px 3px rgba(60,40,20,0.45));
}

#outline-canvas path.contour {
  fill: none; stroke: var(--groove); stroke-width: 1.7;
  stroke-linecap: round; stroke-linejoin: round; opacity: 0.95;
}
.outline-empty { fill: var(--ink-3); font-family: var(--mono); font-size: 12px; }

.spinner {
  width: 26px; height: 26px; border: 2px solid rgba(106,74,44,0.2);
  border-top-color: var(--clay); border-radius: 50%; animation: spin 0.7s linear infinite;
}

/* ---------- Playback bar (beneath the bowl, like a turntable) ---------- */
.playback-overlay {
  display: flex; align-items: center; gap: 0.55rem;
  margin: 0 auto;
  padding: 0.5rem 0.7rem;
  width: min(100%, 460px);
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: 999px;
  box-shadow: 0 1px 2px rgba(34,28,20,0.04);
}
.play-btn {
  width: 42px; height: 42px; min-width: 42px; min-height: 42px;
  border: none; border-radius: 50%; background: var(--clay); color: #fbf3e8;
  font-size: 0.9rem; cursor: pointer; flex-shrink: 0;
  display: inline-flex; align-items: center; justify-content: center;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.15);
  transition: background 0.15s var(--ease), transform 0.12s var(--ease);
}
.play-btn:hover { background: var(--clay-deep); }
.play-btn:active { transform: scale(0.94); }
.play-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.icon-btn {
  width: 38px; height: 38px; min-width: 38px; min-height: 38px;
  border: 1px solid var(--line-strong); border-radius: 50%;
  background: transparent; color: var(--ink); cursor: pointer; flex-shrink: 0;
  display: inline-flex; align-items: center; justify-content: center;
  transition: border-color 0.15s var(--ease), transform 0.12s var(--ease);
}
.icon-btn:hover { border-color: var(--ink); }
.icon-btn:active { transform: scale(0.94); }
.icon-btn:disabled { opacity: 0.35; cursor: not-allowed; }

#trace-scrub { flex: 1; min-width: 60px; accent-color: var(--clay); }
.speed-label {
  display: flex; align-items: center; gap: 0.35rem;
  font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--ink-2); white-space: nowrap;
}
.speed-label input { width: 56px; accent-color: var(--clay); }
.legend { display: none; }

input[type="range"] {
  -webkit-appearance: none; appearance: none; height: 3px; border-radius: 999px;
  background: var(--line-strong); accent-color: var(--clay); min-height: 28px;
  touch-action: pan-y;
}

/* ============================================================
   Controls column
   ============================================================ */
.controls { display: flex; flex-direction: column; gap: 1.1rem; min-width: 0; }

.meta-bar { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; }
.filename {
  font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.03em; color: var(--ink-2);
  max-width: 220px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.pill {
  font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.06em; text-transform: uppercase;
  padding: 0.28rem 0.6rem; border-radius: 999px; background: var(--paper-sunken);
  color: var(--ink-2); border: 1px solid var(--line);
}
.pill-accent { color: var(--clay); border-color: rgba(178,74,38,0.35); background: var(--clay-soft); }

.panel-block {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
}
.panel-head-row { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 1.1rem; }
.panel-block h2 {
  margin: 0;
  font-family: var(--display); font-optical-sizing: auto;
  font-size: 1.3rem; font-weight: 500; letter-spacing: -0.01em; color: var(--ink);
}
.panel-head-row .step-eyebrow { margin-bottom: 0.2rem; }

/* settings */
.settings-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem 1.1rem; }
.settings-grid label {
  display: flex; flex-direction: column; gap: 0.45rem;
  font-size: 0.74rem; font-weight: 600; color: var(--ink-2);
  letter-spacing: 0.01em;
}
.settings-grid label.full { grid-column: 1 / -1; }
.settings-grid label.check {
  flex-direction: row; align-items: center; gap: 0.55rem; grid-column: 1 / -1;
  color: var(--ink); font-weight: 600; cursor: pointer; min-height: 34px;
}
.settings-grid label.check input { width: 18px; height: 18px; accent-color: var(--clay); flex-shrink: 0; }
.settings-grid label output {
  font-family: var(--mono); font-weight: 500; color: var(--clay); float: right;
}
.settings-grid select {
  width: 100%; min-height: 40px; padding: 0 0.6rem;
  font-family: var(--ui); font-size: 0.85rem; color: var(--ink);
  background: var(--paper); border: 1px solid var(--line-strong); border-radius: var(--radius);
}

.settings-advanced-body {
  margin-top: 1.1rem; padding-top: 1.1rem; border-top: 1px solid var(--line);
  animation: view-in 0.3s var(--ease) both;
}
.settings-advanced-body.collapsed { display: none; }

/* post-download extras live in the controls meta row */
.download-row { width: 100%; animation: view-in 0.35s var(--ease) both; }
.download-row .link-btn { min-height: 32px; }
.btn-spinner {
  width: 14px; height: 14px; border: 2px solid rgba(255,255,255,0.35);
  border-top-color: #fff; border-radius: 50%; animation: spin 0.7s linear infinite;
}
.status-line {
  width: 100%; font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.04em;
  color: var(--ink-2); text-align: left;
}
.status-line:empty { display: none; }

/* source */
.preview-source h2 { font-size: 1.15rem; margin-bottom: 0.8rem; }
.thumb-wrap {
  aspect-ratio: 16 / 10; background: var(--paper-sunken); border-radius: var(--radius);
  overflow: hidden; display: grid; place-items: center; border: 1px solid var(--line);
}
.thumb-wrap img { max-width: 100%; max-height: 100%; object-fit: contain; }
.thumb-wrap svg { width: 100%; height: 100%; display: block; }

/* ============================================================
   Tablet / mobile
   ============================================================ */
@media (max-width: 900px) {
  .topbar { padding: 0.85rem 1.1rem; padding-top: max(0.85rem, env(safe-area-inset-top)); }
  .brand h1 { font-size: 1.2rem; }
  .brand p { display: none; }

  .mode-picker {
    height: calc(100dvh - 74px);
    padding: 1.1rem;
    padding-left: max(1.1rem, env(safe-area-inset-left));
    padding-right: max(1.1rem, env(safe-area-inset-right));
  }
  .mode-picker-head { margin-bottom: 0.9rem; }
  .mode-picker-head h2, .empty-title { font-size: 1.5rem; }
  .mode-picker-sub { font-size: 0.82rem; }

  .mode-grid {
    grid-template-columns: 1fr;
    grid-auto-rows: 1fr;
    align-content: stretch;
    gap: 0.7rem;
  }
  .mode-card {
    flex-direction: row;
    align-items: stretch;
    gap: 0.9rem;
    padding: 0.5rem;
  }
  .mode-card-preview {
    flex: none;
    width: 44%;
    max-width: 200px;
    aspect-ratio: auto;
    height: auto;
    min-height: 0;
    align-self: stretch;
  }
  .mode-card-body {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 0.2rem 0.4rem;
  }
  .mode-card-desc { display: none; }
  .mode-card-suggested { margin-bottom: 0.2rem; }
  .mode-card-title { font-size: 1.1rem; margin-bottom: 0.2rem; }

  .workspace { display: block; padding: 0; }

  .stage {
    position: sticky;
    top: calc(env(safe-area-inset-top, 0px) + 58px);
    z-index: 6;
    gap: 0.6rem;
    padding: 0.75rem 1.1rem 0.85rem;
    padding-left: max(1.1rem, env(safe-area-inset-left));
    padding-right: max(1.1rem, env(safe-area-inset-right));
    background: color-mix(in srgb, var(--paper) 92%, transparent);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--line);
  }
  .sand-table-wrap { width: min(100%, 46vh); }

  .stage-caption { display: none; }

  .controls {
    padding: 1.1rem 1.1rem 2rem;
    padding-left: max(1.1rem, env(safe-area-inset-left));
    padding-right: max(1.1rem, env(safe-area-inset-right));
    padding-bottom: max(2rem, env(safe-area-inset-bottom));
    gap: 1rem;
  }

  .playback-overlay { width: 100%; padding: 0.4rem 0.5rem; gap: 0.4rem; }
  .speed-label { display: none; }
  .play-btn { width: 40px; height: 40px; min-width: 40px; min-height: 40px; }
  .icon-btn { width: 36px; height: 36px; min-width: 36px; min-height: 36px; }
}

@media (max-width: 600px) {
  .panel-block { padding: 1rem; }
  .settings-grid { grid-template-columns: 1fr; }
  .stage-bar { gap: 0.5rem; }
  .download-btn { padding: 0.42rem 0.8rem; }
  .empty-drop { padding: 2.5rem 1.5rem; }
  .empty-title { font-size: 1.5rem; }
}