:root {
  --bg-1: #f0e9dc;
  --bg-2: #d5c8ad;
  --ink: #111111;
  --muted: #4c4f4f;
  --card: rgba(255, 255, 255, 0.84);
  --edge: rgba(17, 17, 17, 0.18);
  --accent: #1f5f4a;
  --accent-soft: #ecf6f1;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at 12% 18%, #fff5dd, transparent 28%),
    radial-gradient(circle at 88% 8%, #f4dfbc, transparent 33%),
    linear-gradient(140deg, var(--bg-1), var(--bg-2));
  color: var(--ink);
  font-family: "Space Grotesk", sans-serif;
}

.app-shell {
  width: min(1200px, 94vw);
  margin: 1.3rem auto 2rem;
}

.hero {
  margin-bottom: 1rem;
}

.hero h1 {
  margin: 0;
  font-size: clamp(1.8rem, 2.5vw, 2.4rem);
  letter-spacing: 0.01em;
}

.hero p {
  margin: 0.45rem 0 0;
  color: var(--muted);
}

.steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.step-card {
  background: var(--card);
  border: 1px solid var(--edge);
  border-radius: 1rem;
  padding: 1rem;
  backdrop-filter: blur(4px);
  box-shadow: 0 10px 32px rgba(44, 38, 26, 0.08);
}

.step-card h2 {
  margin: 0 0 0.7rem;
  font-size: 1.1rem;
}

.controls-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  align-items: end;
  margin-bottom: 0.8rem;
}

label {
  display: grid;
  gap: 0.35rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.file-input-label {
  min-width: 220px;
}

.paste-zone {
  border: 1px dashed rgba(31, 95, 74, 0.42);
  border-radius: 0.7rem;
  padding: 0.7rem 0.8rem;
  background: rgba(236, 246, 241, 0.55);
  color: var(--muted);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.86rem;
  margin-bottom: 0.8rem;
  min-height: 2.6rem;
}

.paste-zone:focus {
  outline: 2px solid rgba(31, 95, 74, 0.38);
  outline-offset: 1px;
}

input,
select,
button,
textarea {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.9rem;
}

input,
select,
textarea {
  border-radius: 0.6rem;
  border: 1px solid var(--edge);
  padding: 0.5rem 0.6rem;
  background: #fff;
}

button {
  border-radius: 0.7rem;
  border: 1px solid rgba(31, 95, 74, 0.4);
  background: var(--accent);
  color: #fff;
  padding: 0.5rem 0.8rem;
  cursor: pointer;
}

button.ghost {
  background: #fff;
  color: var(--accent);
}

button.toggle-active {
  background: var(--accent);
  color: #fff;
}

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

canvas {
  width: 100%;
  border-radius: 0.8rem;
  border: 1px solid var(--edge);
  background: #efe8da;
  margin-bottom: 0.5rem;
}

.hint,
.status {
  margin: 0.25rem 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.spinner {
  display: inline-block;
  width: 12px;
  height: 12px;
  border: 2px solid rgba(31, 95, 74, 0.28);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
  margin-left: 0.35rem;
  vertical-align: middle;
}

.hidden {
  display: none !important;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.table-wrap {
  margin-top: 0.7rem;
  max-height: 280px;
  overflow: auto;
  border: 1px solid var(--edge);
  border-radius: 0.7rem;
  background: #fff;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.84rem;
}

th,
td {
  text-align: left;
  padding: 0.45rem 0.5rem;
  border-bottom: 1px solid rgba(17, 17, 17, 0.08);
}

th {
  background: var(--accent-soft);
  position: sticky;
  top: 0;
}

textarea {
  width: 100%;
  min-height: 180px;
  resize: vertical;
}

#sgfPreviewCanvas {
  background: #dcc298;
}

#step3-card {
  position: relative;
  border-color: rgba(13, 33, 27, 0.35);
  background: linear-gradient(145deg, rgba(229, 247, 238, 0.88), rgba(250, 242, 225, 0.92));
  overflow: hidden;
}

#step3-card::before {
  content: "";
  position: absolute;
  top: -48px;
  right: -42px;
  width: 170px;
  height: 170px;
  background: linear-gradient(160deg, rgba(31, 95, 74, 0.28), rgba(217, 129, 61, 0.25));
  transform: rotate(24deg);
  border-radius: 1.2rem;
  pointer-events: none;
}

.sgf-studio {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.7rem;
}

.sgf-pane {
  background: rgba(255, 255, 255, 0.75);
  border: 1px solid rgba(17, 17, 17, 0.13);
  border-radius: 0.7rem;
  padding: 0.55rem;
}

.pane-title {
  margin: 0 0 0.42rem;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  color: #25463a;
  text-transform: uppercase;
}

#sgfPreviewCanvas {
  margin-bottom: 0;
  max-height: none;
  height: auto;
  object-fit: contain;
  cursor: crosshair;
}

#sgfOutput {
  min-height: 180px;
  margin-bottom: 0;
  background: rgba(255, 255, 255, 0.92);
}

.sgf-tool-row {
  align-items: center;
}

.dpad-wrap {
  display: grid;
  gap: 0.35rem;
  justify-items: center;
}

.dpad-mid {
  display: flex;
  gap: 0.35rem;
}

.dpad-btn {
  min-width: 4.5rem;
}

@media (min-width: 1040px) {
  .steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  #step1-card,
  #step3-card {
    grid-column: span 2;
  }

  #step2-card {
    grid-column: span 1;
  }
}