:root {
  --paper: #FAFAFA;
  --surface: #FFFFFF;
  --ink: #14171C;
  --graphite: #5B6472;
  --rule: #E1E4E9;
  --rule-strong: #CBCFD6;

  --signal: #2354E3;
  --signal-soft: #E7EDFD;
  --teal: #0E7C7B;
  --teal-soft: #E1F2F1;
  --violet: #6D4AAE;
  --violet-soft: #EFE9F8;
  --amber: #B7791F;
  --amber-soft: #FBF0DD;
  --rose: #9C3D63;
  --rose-soft: #F7E7EE;
  --forest: #2E7D4F;
  --forest-soft: #E3F2E8;
  --danger: #C4341F;
  --danger-soft: #FBEAE7;

  --radius: 6px;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--sans);
  background: var(--paper);
  color: var(--ink);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.wrapper {
  max-width: 1040px;
  margin: 0 auto;
  padding: 48px 24px 80px;
}

/* ---------- Header ---------- */
header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
  margin-bottom: 32px;
}

.header-left { display: flex; gap: 14px; align-items: center; }

.logo-box {
  width: 36px;
  height: 36px;
  background: var(--ink);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.logo-box svg { width: 18px; height: 18px; }

h1 {
  font-size: 19px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.subtitle { font-size: 13px; color: var(--graphite); margin-top: 2px; }

.header-meta {
  text-align: right;
  font-size: 12px;
  color: var(--graphite);
  line-height: 1.6;
  white-space: nowrap;
}

hr.rule {
  border: none;
  border-top: 1px solid var(--rule);
  margin: 28px 0;
}

/* ---------- Section labels ---------- */
.section-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--graphite);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-label::after { content: ''; flex: 1; height: 1px; background: var(--rule); }

/* ---------- Panels ---------- */
.panel {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 20px;
}

.preview-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 32px 20px;
  margin-bottom: 20px;
}

.canvas-container {
  background-image:
    linear-gradient(45deg, #eee 25%, transparent 25%),
    linear-gradient(-45deg, #eee 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #eee 75%),
    linear-gradient(-45deg, transparent 75%, #eee 75%);
  background-size: 12px 12px;
  background-position: 0 0, 0 6px, 6px -6px, -6px 0px;
  padding: 24px;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  margin-bottom: 18px;
}

#mainCanvas { image-rendering: pixelated; }

#miniPreviews { display: flex; gap: 24px; align-items: center; }
#miniPreviews canvas { image-rendering: pixelated; border: 1px solid var(--rule); }

.size-badge {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--graphite);
  margin-top: 14px;
}

.main-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}

@media (max-width: 780px) {
  .main-grid { grid-template-columns: 1fr; }
}

/* ---------- Form controls ---------- */
.input-group { margin-bottom: 18px; }
.input-group:last-child { margin-bottom: 0; }

label {
  display: block;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--graphite);
  margin-bottom: 8px;
}

label .val { font-family: var(--mono); color: var(--ink); text-transform: none; letter-spacing: 0; }

input[type="text"], textarea {
  width: 100%;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 10px 12px;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 13.5px;
  outline: none;
}

input[type="text"]:focus, textarea:focus { border-color: var(--signal); background: var(--surface); }

textarea { resize: vertical; min-height: 76px; line-height: 1.6; }

.color-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

.color-input {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 6px 10px;
}

input[type="color"] {
  background: none; border: none; width: 26px; height: 26px; cursor: pointer; padding: 0;
  border-radius: 4px; overflow: hidden;
}

.hex-val { font-size: 12px; color: var(--graphite); font-family: var(--mono); }

input[type="range"] { width: 100%; accent-color: var(--signal); }

/* ---------- Segmented toggle (pill group) ---------- */
.toggle-group {
  display: flex;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 3px;
  gap: 3px;
}

.toggle-btn {
  flex: 1;
  padding: 7px 8px;
  font-size: 11.5px;
  font-family: var(--sans);
  font-weight: 500;
  background: none;
  border: none;
  border-radius: 4px;
  color: var(--graphite);
  cursor: pointer;
}

.toggle-btn:hover { color: var(--ink); }
.toggle-btn.active { background: var(--signal-soft); color: var(--signal); }

/* icon picker */
.icon-grid { display: flex; gap: 8px; flex-wrap: wrap; }

.icon-btn {
  width: 40px; height: 40px;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--paper);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
}

.icon-btn canvas { image-rendering: pixelated; width: 20px; height: 20px; }
.icon-btn.active { border-color: var(--signal); background: var(--signal-soft); }

/* ---------- Presets ---------- */
.presets-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(92px, 1fr));
  gap: 8px;
}

.preset-card {
  aspect-ratio: 16/8;
  cursor: pointer;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color .15s, transform .15s;
  position: relative;
  overflow: hidden;
}

.preset-card:hover { border-color: var(--rule-strong); transform: translateY(-1px); }

.preset-card span {
  font-size: 9px;
  font-weight: 700;
  font-family: var(--mono);
  text-shadow: 0 1px 2px rgba(0,0,0,0.35);
  z-index: 2;
}

/* ---------- Buttons ---------- */
.btn-row { display: flex; gap: 10px; margin-top: 16px; }

.btn-main, .btn-line {
  padding: 11px 16px;
  border-radius: var(--radius);
  font-family: var(--sans);
  font-weight: 600;
  font-size: 13px;
  cursor: pointer;
  border: 1px solid transparent;
}

.btn-main { background: var(--ink); color: #fff; flex: 1; }
.btn-main:hover { background: #000; }

.btn-line { background: var(--surface); color: var(--ink); border-color: var(--rule); }
.btn-line:hover { border-color: var(--rule-strong); }

select {
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 10px 12px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink);
  outline: none;
}

.pill-row { display: flex; flex-wrap: wrap; gap: 8px; }

.pill-btn {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 100px;
  padding: 6px 12px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink);
  cursor: pointer;
}

.pill-btn:hover { border-color: var(--signal); color: var(--signal); }

.dot {
  display: inline-block;
  width: 8px; height: 8px;
  border-radius: 2px;
  margin-right: 6px;
  vertical-align: middle;
}

.hint { font-size: 11.5px; color: var(--graphite); margin-top: 10px; line-height: 1.6; }
.hint code { font-family: var(--mono); background: var(--paper); padding: 1px 5px; border-radius: 4px; border: 1px solid var(--rule); }

footer {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--rule);
  font-size: 12px;
  color: var(--graphite);
  display: flex;
  justify-content: space-between;
}

footer a { color: var(--graphite); }