:root {
  --bg:        #0b0d12;
  --bg-card:   #14171f;
  --bg-input:  #1c2030;
  --line:      #232838;
  --text:      #e8ebf3;
  --muted:     #8b93a7;
  --accent:    #6ea8ff;
  --accent-2:  #2a4d8f;
  --warn:      #f0a868;
  --ok:        #6ee7a4;
  --shadow:    0 6px 24px rgba(0,0,0,.35);
  --r-md:      14px;
  --r-sm:      8px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: radial-gradient(1200px 800px at 80% -10%, #1a2238 0%, var(--bg) 60%);
  color: var(--text);
  font: 15px/1.45 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI",
        Roboto, Helvetica, Arial, sans-serif;
  min-height: 100dvh;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

a { color: var(--accent); }
a:hover { text-decoration: underline; }

header {
  display: flex;
  justify-content: center;
  padding: 16px 16px calc(8px + env(safe-area-inset-top)) 16px;
  padding-top: calc(16px + env(safe-area-inset-top));
}
.brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  text-align: left;
}
.brand img { display: block; }
.brand h1 {
  margin: 0;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.brand p {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
}

main {
  display: grid;
  gap: 14px;
  padding: 4px 16px 32px 16px;
  max-width: 1100px;
  margin: 0 auto;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 16px;
  box-shadow: var(--shadow);
}

/* ── Buttons ───────────────────────────────────────────── */
button {
  font: inherit;
  font-weight: 600;
  border: 0;
  border-radius: var(--r-sm);
  padding: 12px 16px;
  min-height: 44px;
  cursor: pointer;
  letter-spacing: 0.01em;
  touch-action: manipulation;
}
button.primary {
  background: linear-gradient(180deg, #4f7fdc 0%, #2c5cba 100%);
  color: white;
  box-shadow: 0 1px 0 rgba(255,255,255,.1) inset, 0 4px 12px rgba(40,80,180,.25);
}
button.primary:hover { filter: brightness(1.08); }
button.primary:disabled {
  background: #2b3344;
  color: #6f7891;
  box-shadow: none;
  cursor: not-allowed;
}
button.ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line);
}
button.ghost:hover { background: var(--bg-input); }

/* ── Upload ────────────────────────────────────────────── */
.upload-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.upload-row button { flex: 1 1 140px; }
.hint { color: var(--muted); margin: 12px 0 0 0; font-size: 13px; }

/* ── Previews ──────────────────────────────────────────── */
.previews {
  display: grid;
  gap: 14px;
}
.preview h3 {
  margin: 0 0 8px 0;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  font-weight: 600;
}
.preview canvas {
  display: block;
  width: 100%;
  aspect-ratio: 1 / 1;
  background: #000;
  border-radius: var(--r-sm);
  border: 1px solid var(--line);
  max-height: 70vh;
  object-fit: contain;
  margin: 0 auto;
}

/* ── Actions ───────────────────────────────────────────── */
.action-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.action-row .primary { flex: 1 1 160px; }
.action-row .ghost   { flex: 0 0 auto; }

.progress {
  margin-top: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  color: var(--muted);
  visibility: hidden;
}
.progress.active { visibility: visible; }
.progress-track {
  flex: 1;
  height: 6px;
  background: var(--bg-input);
  border-radius: 3px;
  overflow: hidden;
}
#progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent) 0%, #b896ff 100%);
  transition: width 0.18s ease-out;
}

.result-display {
  margin-top: 14px;
  padding: 10px;
  background: rgba(110, 231, 164, 0.05);
  border: 1px dashed rgba(110, 231, 164, 0.2);
  border-radius: var(--r-sm);
  font-size: 13px;
  color: var(--muted);
  display: none;
  text-align: center;
}
.result-display.active { display: block; }
.result-display strong { color: var(--ok); font-size: 16px; margin: 0 2px; }

/* ── Presets ───────────────────────────────────────────── */
.link-btn {
  background: transparent;
  color: var(--accent);
  border: 0;
  padding: 4px 8px;
  font-size: 13px;
  font-weight: 500;
  min-height: 0;
  cursor: pointer;
  border-radius: 6px;
}
.link-btn:hover { background: var(--bg-input); }

/*
.preset-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 0 0 12px 0;
}
.preset-head h3 {
  margin: 0;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  font-weight: 600;
}

.preset-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.preset-btn {
  background: var(--bg-input);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  padding: 14px 14px;
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 4px;
  color: var(--text);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, box-shadow 0.15s;
  min-height: 0;
}
.preset-btn:hover { border-color: var(--accent-2); }
.preset-btn.active {
  border-color: var(--accent);
  background: linear-gradient(180deg, rgba(110,168,255,0.12) 0%, rgba(110,168,255,0.04) 100%);
  box-shadow: 0 0 0 3px rgba(110, 168, 255, 0.15);
}
.preset-name {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.preset-btn.active .preset-name { color: var(--accent); }
.preset-desc {
  font-size: 12px;
  color: var(--muted);
  line-height: 1.4;
}
*/

/* ── Sliders ───────────────────────────────────────────── */
details { display: block; }
summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
  user-select: none;
  padding: 4px 0;
  display: flex;
  align-items: center;
  gap: 8px;
}
summary::-webkit-details-marker { display: none; }
summary::before {
  content: "▸";
  display: inline-block;
  transition: transform 0.15s ease;
  color: var(--muted);
  font-size: 12px;
}
details[open] > summary::before { transform: rotate(90deg); }

.slider { padding: 16px 0; border-top: 1px solid var(--line); }
.slider:first-of-type { border-top: 0; padding-top: 8px; }
.slider-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}
.slider-head label { font-weight: 600; font-size: 14px; }

.slider-chip {
  display: inline-flex;
  align-items: center;
  background: var(--bg-input);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 12px;
  gap: 4px;
  min-width: 78px;
  justify-content: center;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.slider-chip:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(110, 168, 255, 0.18);
}
.slider-chip input[type="number"] {
  background: transparent;
  border: 0;
  color: var(--text);
  font: 600 16px/1 -apple-system, BlinkMacSystemFont, "SF Pro Text", system-ui, sans-serif;
  font-variant-numeric: tabular-nums;
  /* width set per-slider in JS so each chip fits its longest possible value */
  padding: 4px 0;
  text-align: right;
  outline: none;
  -moz-appearance: textfield;
}
.slider-chip input[type="number"]::-webkit-outer-spin-button,
.slider-chip input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
.slider-chip .suffix {
  color: var(--muted);
  font-size: 13px;
  font-weight: 500;
}
.slider-chip.auto::after {
  content: "auto";
  font-size: 10px;
  font-weight: 700;
  color: var(--accent);
  background: rgba(110, 168, 255, 0.15);
  border: 1px solid rgba(110, 168, 255, 0.35);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-left: 6px;
  padding: 2px 6px;
  border-radius: 999px;
  cursor: help;
}

.muted { color: var(--muted); margin: 8px 0 0 0; font-size: 12px; line-height: 1.5; }

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 32px;
  background: transparent;
  margin: 0;
  display: block;
}
input[type="range"]::-webkit-slider-runnable-track {
  height: 6px;
  background: var(--bg-input);
  border-radius: 3px;
  border: 1px solid var(--line);
}
input[type="range"]::-moz-range-track {
  height: 6px;
  background: var(--bg-input);
  border-radius: 3px;
  border: 1px solid var(--line);
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: linear-gradient(180deg, #6ea8ff 0%, #2c5cba 100%);
  margin-top: -10px;
  box-shadow: 0 2px 6px rgba(0,0,0,.35), 0 0 0 2px var(--bg-card);
  cursor: pointer;
}
input[type="range"]::-moz-range-thumb {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: linear-gradient(180deg, #6ea8ff 0%, #2c5cba 100%);
  border: 0;
  box-shadow: 0 2px 6px rgba(0,0,0,.35), 0 0 0 2px var(--bg-card);
  cursor: pointer;
}

/* ── Log ───────────────────────────────────────────────── */
.log-card pre {
  background: #07090e;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  padding: 12px;
  margin: 10px 0 0 0;
  font: 12px/1.5 ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  color: #c4cad9;
  overflow: auto;
  max-height: 280px;
  white-space: pre-wrap;
  word-break: break-word;
}

footer {
  text-align: center;
  color: var(--muted);
  font-size: 12px;
  padding: 8px 0 calc(8px + env(safe-area-inset-bottom)) 0;
}

/* ── Wide layout ───────────────────────────────────────── */
@media (min-width: 720px) {
  .previews { grid-template-columns: 1fr 1fr; }
  header, main { padding-left: 24px; padding-right: 24px; }
}