:root {
  --bg: #0a0c11;
  --panel: #141823;
  --panel-2: #1a2030;
  --line: #262d3d;
  --line-soft: #1c2230;
  --text: #eef1f7;
  --muted: #9aa4ba;
  --faint: #69728a;
  --accent: #5b8cff;
  --accent-2: #a855f7;
  --ok: #34d399;
  --err: #fb7185;
  --warn: #ff9500;
  --radius: 16px;
  --shadow: 0 24px 60px -30px rgba(0, 0, 0, 0.9);
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.bg-glow {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(620px 320px at 18% -8%, rgba(91, 140, 255, 0.20), transparent 70%),
    radial-gradient(700px 360px at 88% -4%, rgba(168, 85, 247, 0.16), transparent 72%);
}

.site-header,
main,
.site-footer {
  position: relative;
  z-index: 1;
  max-width: 1000px;
  margin: 0 auto;
  padding-left: max(22px, env(safe-area-inset-left));
  padding-right: max(22px, env(safe-area-inset-right));
}

/* ---------- header ---------- */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: 24px;
  padding-bottom: 8px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font-weight: 750;
  letter-spacing: -0.02em;
}
.brand-mark {
  width: 30px;
  height: 30px;
  border-radius: 9px;
  display: grid;
  place-items: center;
  font-size: 16px;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 10px 24px -12px rgba(91, 140, 255, 0.9);
}
.brand-name { font-size: 17px; }
.site-nav { display: flex; gap: 18px; align-items: center; }
.site-nav a,
.nav-btn {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 650;
  transition: color 0.16s;
}
.site-nav a:hover,
.nav-btn:hover { color: var(--text); }
.nav-btn {
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 999px;
  padding: 5px 12px;
  cursor: pointer;
  font: inherit;
  font-size: 13px;
  font-weight: 700;
}
.nav-btn:hover { border-color: var(--accent); color: var(--text); }

/* ---------- hero ---------- */
.hero { padding: 30px 0 22px; }
.eyebrow {
  margin: 0 0 10px;
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}
.hero h1 {
  margin: 0 0 14px;
  font-size: clamp(28px, 5.2vw, 44px);
  line-height: 1.08;
  letter-spacing: -0.03em;
  background: linear-gradient(100deg, #ffffff 8%, #bccaff 52%, #ddbcff 92%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.lead { margin: 0 0 18px; max-width: 640px; color: var(--muted); font-size: 15.5px; }
.badges {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
}
.badges li {
  padding: 5px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.02);
  color: var(--muted);
  font-size: 12.5px;
  font-weight: 650;
}

/* ---------- tabs ---------- */
.tabs {
  display: flex;
  gap: 4px;
  padding: 4px;
  margin: 6px 0 22px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
}
.tab {
  flex: 1;
  border: 0;
  background: transparent;
  color: var(--muted);
  padding: 11px 20px;
  border-radius: 10px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: 0.18s;
}
.tab:hover { color: var(--text); }
.tab.active {
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 10px 24px -12px rgba(91, 140, 255, 0.95);
}

.panel.hidden { display: none; }

/* ---------- drop zones ---------- */
.upload-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.drop {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 26px 16px;
  text-align: center;
  cursor: pointer;
  border: 1.5px dashed var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.025), rgba(255, 255, 255, 0));
  transition: 0.2s;
}
.drop:hover, .drop:active {
  border-color: var(--accent);
  background: rgba(91, 140, 255, 0.07);
}
.drop input { display: none; }
.drop-icon { font-size: 26px; line-height: 1; margin-bottom: 6px; }
.drop-title { font-weight: 700; }
.drop-hint { color: var(--faint); font-size: 13px; word-break: break-word; }
.drop.wide { margin-bottom: 14px; }
.secret-drop {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 16px;
  text-align: left;
  cursor: default;
  border: 1.5px dashed var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.025), rgba(255, 255, 255, 0));
}
.secret-type-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}
.seg {
  display: inline-flex;
  gap: 4px;
  padding: 3px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
}
.seg-btn {
  border: 0;
  background: transparent;
  color: var(--muted);
  padding: 7px 14px;
  border-radius: 8px;
  font: inherit;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: 0.16s;
}
.seg-btn:hover { color: var(--text); }
.seg-btn.active {
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
}
.secret-pane {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  text-align: center;
  cursor: pointer;
  min-height: 90px;
  justify-content: center;
}
.secret-pane.hidden { display: none !important; }
.secret-pane input { display: none; }
.secret-pane textarea {
  width: 100%;
  min-height: 96px;
  resize: vertical;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  color: var(--text);
  font: inherit;
  font-size: 14px;
  cursor: text;
}
.secret-pane textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(91, 140, 255, 0.16);
}
.secret-pane:not(label) { cursor: default; }
.hidden { display: none !important; }

.payload-box {
  margin-top: 8px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: var(--panel-2);
  text-align: left;
}
.payload-label {
  margin: 0 0 6px;
  color: var(--faint);
  font-size: 12px;
  font-weight: 700;
  word-break: break-all;
}
.payload-text {
  margin: 0;
  max-height: 140px;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--text);
  font-size: 12.5px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

.batch-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.batch-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  font-size: 13.5px;
}
.batch-name {
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--text);
  font-weight: 650;
}
.batch-note {
  flex: 0 1 auto;
  max-width: 45%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--faint);
  font-size: 12px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
.batch-item .badge {
  flex: 0 0 auto;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 11.5px;
  font-weight: 750;
}
.batch-item .badge.ok {
  color: var(--ok);
  background: rgba(52, 211, 153, 0.12);
  border: 1px solid rgba(52, 211, 153, 0.35);
}
.batch-item .badge.fail {
  color: var(--err);
  background: rgba(251, 113, 133, 0.12);
  border: 1px solid rgba(251, 113, 133, 0.35);
}

/* ---------- generic rows ---------- */
.row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 14px;
}
.row-label {
  flex: 0 0 auto;
  color: var(--muted);
  font-size: 13px;
  font-weight: 650;
}
.row-value {
  color: var(--faint);
  font-size: 12.5px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
.grow { flex: 1 1 0; min-width: 0; }

select, input[type="number"] {
  padding: 10px 11px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  color: var(--text);
  font: inherit;
  font-size: 14px;
  transition: 0.16s;
}
select:focus, input[type="number"]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(91, 140, 255, 0.16);
}

/* ---------- tier slider ---------- */
.tier { margin-top: 18px; }
.tier-wrap { position: relative; padding: 0 2px; }
.tier-labels {
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
  color: var(--faint);
  font-size: 12px;
  font-weight: 650;
}
.tier-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 8px;
  border-radius: 4px;
  background: linear-gradient(90deg, #34c759, #ff9500, #ff3b30);
  outline: none;
  cursor: pointer;
}
.tier-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid var(--warn);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.45);
  cursor: pointer;
}
.tier-slider::-moz-range-thumb {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid var(--warn);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.45);
  cursor: pointer;
}
.tier-slider:disabled { opacity: 0.4; cursor: not-allowed; }
.tier-info {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  margin-top: 12px;
}
.tier-name { color: var(--warn); font-size: 14px; font-weight: 750; }
.tier-desc { color: var(--faint); font-size: 12.5px; }
.link-btn {
  margin-left: auto;
  border: 0;
  background: none;
  color: var(--accent);
  font: inherit;
  font-size: 13px;
  font-weight: 650;
  cursor: pointer;
  padding: 4px 0;
}
.link-btn:hover { text-decoration: underline; }

.custom-panel {
  display: none;
  margin-top: 14px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel-2);
}
.custom-panel.open { display: block; }
.param-row { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.param-row:last-child { margin-bottom: 0; }
.param-label {
  flex: 0 0 108px;
  color: var(--muted);
  font-size: 12.5px;
  font-weight: 650;
}
.param-row input[type="range"] { flex: 1 1 0; min-width: 0; accent-color: var(--warn); height: 22px; }
.param-val {
  flex: 0 0 38px;
  text-align: right;
  color: var(--warn);
  font-size: 12.5px;
  font-weight: 750;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

/* ---------- buttons ---------- */
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 24px;
  border: 1px solid transparent;
  border-radius: 12px;
  font: inherit;
  font-size: 15px;
  font-weight: 750;
  white-space: nowrap;
  text-decoration: none;
  cursor: pointer;
  transition: 0.18s;
  -webkit-tap-highlight-color: transparent;
}
.btn.primary {
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 16px 34px -16px rgba(91, 140, 255, 0.95);
}
.btn.primary:hover { transform: translateY(-1px); }
.btn.primary:disabled { opacity: 0.4; cursor: not-allowed; transform: none; box-shadow: none; }
.btn.ghost { color: var(--text); border-color: var(--line); background: var(--panel); }
.btn.ghost:hover { border-color: var(--accent); }
.btn.ghost:disabled { opacity: 0.4; cursor: not-allowed; }

.status { min-height: 22px; margin: 14px 0 0; color: var(--muted); font-size: 14px; }
.status.error { color: var(--err); }
.status.success { color: var(--ok); }

.progress {
  display: none;
  height: 5px;
  margin-top: 12px;
  border-radius: 999px;
  background: var(--line);
  overflow: hidden;
}
.progress.active { display: block; }
.progress-bar {
  height: 100%;
  width: 30%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  animation: slide 1.1s ease-in-out infinite;
}
@keyframes slide {
  0% { margin-left: -30%; }
  100% { margin-left: 100%; }
}

/* ---------- previews ---------- */
.previews { display: grid; gap: 14px; margin: 22px 0 6px; }
.previews.three { grid-template-columns: repeat(3, 1fr); }
.previews.two { grid-template-columns: repeat(2, 1fr); }
.card {
  margin: 0;
  padding: 11px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
}
.card figcaption {
  margin-bottom: 9px;
  color: var(--faint);
  font-size: 11.5px;
  font-weight: 750;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.canvas-wrap {
  display: grid;
  place-items: center;
  min-height: 80px;
  border-radius: 11px;
  overflow: hidden;
  background: repeating-conic-gradient(#151a24 0% 25%, #1b2130 0% 50%) 50% / 18px 18px;
}
.canvas-wrap canvas { display: block; width: 100%; height: auto; }
.card .meta {
  margin: 9px 0 0;
  color: var(--muted);
  font-size: 11.5px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  word-break: break-word;
}

/* ---------- manual size ---------- */
.manual-box {
  padding: 14px 16px;
  border-radius: 14px;
  background: var(--panel);
  border: 1px solid var(--line);
}
.manual-label { display: block; margin-bottom: 10px; color: var(--muted); font-size: 13px; font-weight: 650; }
.manual-inputs { display: flex; align-items: center; gap: 10px; }
.manual-inputs input { flex: 1 1 0; min-width: 0; }
.manual-inputs span { color: var(--faint); }
.manual-hint { margin: 10px 0 0; color: var(--faint); font-size: 12px; }

/* ---------- footer ---------- */
.site-footer {
  margin-top: 46px;
  padding-top: 22px;
  padding-bottom: calc(46px + env(safe-area-inset-bottom));
  border-top: 1px solid var(--line-soft);
  color: var(--faint);
  font-size: 13px;
}
.site-footer p { margin: 4px 0; }
.site-footer .muted { color: #565f73; }

/* ---------- responsive ---------- */
@media (max-width: 680px) {
  .upload-grid { grid-template-columns: 1fr; }
  .previews.three { grid-template-columns: repeat(2, 1fr); }
  .hero { padding: 22px 0 16px; }
  .lead { font-size: 15px; }
  .btn { padding-left: 16px; padding-right: 16px; font-size: 14px; }
  .actions .btn { flex: 1 1 calc(50% - 5px); }
  .actions .btn.primary { flex-basis: 100%; }
  .param-label { flex-basis: 92px; font-size: 12px; }
  .row { flex-wrap: wrap; }
  .row .grow { flex-basis: 100%; }
  .tabs { flex-wrap: wrap; }
  .tab { flex: 1 1 calc(50% - 4px); }
}
@media (max-width: 460px) {
  .previews.three,
  .previews.two { grid-template-columns: 1fr; }
  .site-nav { gap: 12px; }
  .site-nav a { font-size: 13px; }
  .tier-info { gap: 2px 10px; }
  .link-btn { margin-left: 0; }
}