:root {
  --bg: #0e0f13;
  --panel: #16181f;
  --panel-2: #1d2029;
  --line: #2a2e3a;
  --text: #e8eaf0;
  --muted: #8b90a0;
  --accent: #e54b6d;
  --accent-2: #4bb6e5;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, system-ui, sans-serif;
  overflow-x: hidden;
}

/* full-viewport gradient layer — a fixed element covers behind the iOS Safari
   toolbars, so the bottom no longer shows a darker uncovered box */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(1200px 600px at 80% -10%, #1b1340 0%, transparent 60%),
    radial-gradient(900px 500px at -10% 110%, #0d2436 0%, transparent 55%),
    var(--bg);
}

.icon { width: 18px; height: 18px; flex: 0 0 auto; display: block; }

.layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 28px;
  padding: 28px;
  max-width: 1180px;
  margin: 0 auto;
}

/* ---- stage ---- */
.stage, .panel { min-width: 0; }
.stage { display: flex; flex-direction: column; align-items: center; gap: 14px; }

.canvas-frame {
  position: relative;
  border-radius: 18px;
  padding: 22px;
  background:
    repeating-conic-gradient(from 0deg, #15171e 0% 25%, #181b23 25% 50%) 0/ 36px 36px;
  border: 1px solid var(--line);
  box-shadow: 0 30px 80px -30px rgba(0,0,0,.8), inset 0 0 0 1px rgba(255,255,255,.02);
}

#gl {
  display: block;
  width: min(620px, calc(100vw - 64px), 78vh);
  height: auto;
  aspect-ratio: 4 / 3;
  border-radius: 10px;
  cursor: crosshair;
  touch-action: none;
  transform: translateZ(0);          /* own compositing layer — fixes iOS Safari ghosting */
  -webkit-transform: translateZ(0);
}
body.mode-move #gl { cursor: move; }

.canvas-hint {
  position: absolute;
  left: 50%; bottom: 30px;
  transform: translateX(-50%);
  font-size: 12px;
  color: var(--muted);
  background: rgba(0,0,0,.45);
  padding: 5px 12px;
  border-radius: 999px;
  pointer-events: none;
  transition: opacity .3s;
}
.canvas-hint.hide { opacity: 0; }

.stage-caption {
  margin: 0;
  font-size: 13px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---- panel ---- */
.panel {
  background: linear-gradient(180deg, var(--panel) 0%, #131419 100%);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 22px;
  height: fit-content;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.field { display: flex; flex-direction: column; gap: 9px; }
.field > label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
}
.field .val { color: var(--text); font-weight: 600; }

select {
  appearance: none;
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 11px 13px;
  font-size: 14px;
  cursor: pointer;
}
select:focus { outline: 2px solid var(--accent-2); }

.variants, .tools { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.tools { grid-template-columns: repeat(2, 1fr); }
.variants button, .tools button {
  background: var(--panel-2);
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 6px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all .15s;
}
.tools button { display: inline-flex; align-items: center; justify-content: center; gap: 7px; }
.variants button:hover, .tools button:hover { color: var(--text); border-color: #3a3f4d; }
.variants button.active, .tools button.active {
  color: #fff;
  border-color: var(--accent);
  background: linear-gradient(180deg, rgba(229,75,109,.25), rgba(229,75,109,.08));
  box-shadow: 0 0 0 1px rgba(229,75,109,.3), 0 6px 18px -8px rgba(229,75,109,.6);
}

input[type=range] {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 999px;
  background: var(--panel-2);
  border: 1px solid var(--line);
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  box-shadow: 0 0 10px rgba(229,75,109,.7);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 11px 14px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all .15s;
}
.btn:hover { border-color: #3a3f4d; transform: translateY(-1px); }
.actions { flex-direction: row; gap: 10px; }
.actions .btn { flex: 1; }
.btn-danger:hover { border-color: var(--accent); color: #ffb3c2; }
.btn-primary {
  background: linear-gradient(180deg, var(--accent), #c23457);
  border: none;
  color: #fff;
  box-shadow: 0 8px 24px -10px rgba(229,75,109,.9);
}
.btn-primary:hover { filter: brightness(1.08); transform: translateY(-1px); }
.save-cta { width: 100%; padding: 14px; font-size: 15px; margin-top: 4px; }

.tip {
  font-size: 12px;
  line-height: 1.5;
  color: var(--muted);
  border-top: 1px solid var(--line);
  padding-top: 16px;
  margin: 0;
}

.disclaimer {
  max-width: 760px;
  margin: 0 auto;
  padding: 8px 24px 44px;
  text-align: center;
  font-size: 12px;
  line-height: 1.65;
  color: var(--muted);
}
.disclaimer a { color: var(--accent-2); text-decoration: none; }
.disclaimer a:hover { text-decoration: underline; }

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; padding: 18px; gap: 18px; }
  .panel { max-width: 620px; margin: 0 auto; width: 100%; }
}

@media (max-width: 600px) {
  .layout { padding: 12px; gap: 16px; }
  .canvas-frame { padding: 12px; border-radius: 14px; }
  #gl { width: min(calc(100vw - 52px), 70vh); }
  .panel { padding: 16px; border-radius: 14px; }
  .variants button, .tools button { padding: 9px 4px; font-size: 12px; }
  .stage-caption { font-size: 12px; }
}