:root {
  color-scheme: dark;
  --bg: #090909;
  --bg-accent: #141414;
  --panel: rgba(20, 20, 20, 0.92);
  --panel-strong: #1d1d1d;
  --text: #f3f3f3;
  --muted: #a7a7a7;
  --line: rgba(255, 255, 255, 0.11);
  --accent: #e8e8e8;
  --accent-soft: #2a2a2a;
  --shadow: 0 22px 70px rgba(0, 0, 0, 0.42);
  --radius: 24px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Avenir Next", "Hiragino Sans", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.08), transparent 28%),
    radial-gradient(circle at bottom right, rgba(255, 255, 255, 0.05), transparent 22%),
    linear-gradient(135deg, #050505, var(--bg-accent) 48%, #111111 100%);
}

button,
input,
output {
  font: inherit;
}

.app-shell {
  width: min(1320px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0 48px;
}

.hero {
  margin-bottom: 20px;
}

.hero-row {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px 16px;
}

.hero h1 {
  margin: 0;
  font-family: "Hiragino Sans", "Avenir Next", sans-serif;
  font-size: clamp(2rem, 3.6vw, 3.6rem);
  font-weight: 800;
  line-height: 1.05;
}

.transfer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.transfer-link {
  padding: 7px 12px;
  font-size: 0.82rem;
  line-height: 1.2;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--line);
  box-shadow: none;
}

.transfer-link:hover {
  background: rgba(255, 255, 255, 0.1);
}

.layout {
  display: grid;
  gap: 20px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  padding: 22px;
}

.input-panel,
.result-panel {
  display: grid;
  gap: 18px;
}

.panel h2,
.panel h3 {
  margin: 0;
}

.panel-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}

.drop-zone {
  display: grid;
  place-items: center;
  gap: 12px;
  padding: 34px 18px;
  border: 2px dashed rgba(255, 255, 255, 0.16);
  border-radius: 20px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.06));
  text-align: center;
  outline: none;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.drop-zone.dragover,
.drop-zone:focus-visible {
  border-color: var(--accent);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.12));
  transform: translateY(-1px);
}

.drop-zone p,
.drop-zone span {
  margin: 0;
}

button {
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  padding: 12px 18px;
  background: var(--accent);
  color: #0c0c0c;
  cursor: pointer;
  transition: transform 140ms ease, opacity 140ms ease, background 140ms ease;
}

button:hover {
  transform: translateY(-1px);
  background: #ffffff;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.segmented {
  display: inline-flex;
  gap: 8px;
  padding: 6px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
}

.preset {
  background: transparent;
  color: var(--muted);
  padding: 10px 14px;
  border-color: transparent;
}

.preset.active {
  background: var(--panel-strong);
  color: var(--text);
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.28);
}

.editor-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(280px, 0.9fr);
  gap: 20px;
}

.canvas-card,
.result-stage {
  position: relative;
  border-radius: 20px;
  overflow: hidden;
  background:
    linear-gradient(45deg, rgba(255, 255, 255, 0.04) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(255, 255, 255, 0.04) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(255, 255, 255, 0.04) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(255, 255, 255, 0.04) 75%);
  background-size: 24px 24px;
  background-position: 0 0, 0 12px, 12px -12px, -12px 0;
  border: 1px solid var(--line);
}

.result-stage {
  border-radius: 0;
  overflow: visible;
}

.canvas-stage {
  position: relative;
  aspect-ratio: 3 / 2;
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.empty-state {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: var(--muted);
  background: rgba(16, 16, 16, 0.86);
  pointer-events: none;
  user-select: none;
  -webkit-user-select: none;
}

.empty-state[hidden] {
  display: none;
}

.controls {
  display: grid;
  gap: 16px;
}

.control-block {
  padding: 18px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--line);
}

.control-note {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.6;
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 14px;
}

label {
  display: grid;
  gap: 8px;
  font-size: 0.92rem;
  color: var(--muted);
}

input[type="number"],
output {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: var(--panel-strong);
  color: var(--text);
}

input[type="number"]:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.18);
  outline-offset: 1px;
}

output {
  display: flex;
  align-items: center;
}

.resize-mode {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 14px;
  color: var(--muted);
}

.resize-mode label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1rem;
  line-height: 1.4;
  white-space: nowrap;
}

.resize-mode input[type="radio"] {
  flex: 0 0 auto;
  margin: 0;
}

.hidden {
  display: none;
}

.action-block {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.image-meta,
.result-meta {
  color: var(--muted);
}

kbd {
  padding: 2px 6px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  font-size: 0.9em;
}

@media (max-width: 960px) {
  .editor-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .app-shell {
    width: min(100% - 20px, 100%);
    padding-top: 20px;
  }

  .panel {
    padding: 16px;
  }

  .field-grid {
    grid-template-columns: 1fr;
  }

  .panel-header {
    align-items: stretch;
  }

  .segmented {
    width: 100%;
    justify-content: space-between;
  }

  .hero-row,
  .transfer-links {
    align-items: stretch;
  }

  .transfer-links {
    width: 100%;
    justify-content: flex-start;
  }
}