:root {
  --bg: #f5f5f7;
  --ink: #1d1d1f;
  --muted: #6e6e73;
  --card: #fff;
  --line: #e3e3e8;
  --accent: #0071e3;
  --accent-dark: #0058b0;
  --ok: #166534;
  --shadow: 0 16px 40px rgba(0, 0, 0, 0.06);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
}
a { color: var(--accent-dark); }
.wrap { width: min(980px, calc(100% - 32px)); margin: 0 auto; }
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: rgba(245, 245, 247, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 64px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 750; letter-spacing: -0.03em; text-decoration: none; color: inherit; }
.brand-mark { width: 32px; height: 32px; border-radius: 9px; background: var(--ink); color: #fff; display: grid; place-items: center; font-size: 0.85rem; }
.nav { display: flex; gap: 6px; flex-wrap: wrap; }
.nav a { text-decoration: none; color: var(--muted); font-size: 0.86rem; font-weight: 650; padding: 7px 10px; border-radius: 999px; }
.nav a.active, .nav a:hover { background: #fff; color: var(--ink); }

.hero { padding: 36px 0 12px; }
.kicker { display: inline-block; background: #e8f2fc; color: var(--accent-dark); font-size: 0.78rem; font-weight: 750; padding: 5px 10px; border-radius: 999px; }
h1 { font-size: clamp(2rem, 4vw, 3.1rem); letter-spacing: -0.045em; line-height: 1.05; margin: 12px 0 8px; }
.lede { color: var(--muted); font-size: 1.05rem; max-width: 40rem; margin: 0 0 18px; }

.drop {
  border: 1.5px dashed #c7c7cc;
  background: var(--card);
  border-radius: 18px;
  padding: 28px 18px;
  text-align: center;
  box-shadow: var(--shadow);
}
.drop.is-over { border-color: var(--accent); background: #f3f8fd; }
.drop strong { display: block; font-size: 1.05rem; margin-bottom: 4px; }
.drop p { margin: 0; color: var(--muted); font-size: 0.9rem; }
.file-btn {
  margin-top: 14px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent);
  color: #fff;
  border-radius: 999px;
  padding: 10px 16px;
  font-weight: 700;
  cursor: pointer;
}
.file-btn input { display: none; }
.controls { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; margin: 14px 0; color: var(--muted); font-size: 0.88rem; }
.controls input[type="range"] { width: 160px; }
.results { display: grid; gap: 10px; }
.result {
  display: grid;
  grid-template-columns: 72px 1fr auto;
  gap: 12px;
  align-items: center;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 10px;
}
.result img { width: 72px; height: 72px; object-fit: cover; border-radius: 8px; background: #eee; }
.result b { display: block; font-size: 0.92rem; }
.result span { color: var(--muted); font-size: 0.8rem; }
.download, .download-all {
  border: 0; border-radius: 999px; padding: 8px 12px; font-weight: 700; cursor: pointer; font-family: inherit;
}
.download { background: var(--ink); color: #fff; }
.download-all { background: var(--accent); color: #fff; margin-top: 10px; }
.error { color: #b91c1c; font-size: 0.85rem; }

.section { padding: 22px 0; }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.guide-card { display: block; text-decoration: none; color: inherit; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 14px; }
.guide-card strong { display: block; margin-bottom: 4px; }
.guide-card span { color: var(--muted); font-size: 0.88rem; }
.prose { max-width: 720px; }
.prose p, .prose li { color: var(--muted); }
.faq details { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; margin-bottom: 8px; }
.faq summary { cursor: pointer; font-weight: 700; }
.site-footer { border-top: 1px solid var(--line); padding: 22px 0 36px; color: var(--muted); font-size: 0.86rem; }
.footer-links { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 8px; }
.footer-links a { color: var(--muted); }

.studio { display: grid; grid-template-columns: minmax(0, 440px) minmax(0, 1fr); gap: 22px; align-items: start; margin-top: 8px; }
.studio[hidden] { display: none; }
.stage {
  position: relative;
  margin: 0 auto;
  background: #d8d8de;
  border-radius: 16px;
  overflow: hidden;
  touch-action: none;
  cursor: grab;
  box-shadow: var(--shadow);
}
.stage:active { cursor: grabbing; }
.stage canvas { display: block; }
.guide {
  position: absolute;
  left: 18%;
  right: 18%;
  top: 8%;
  bottom: 28%;
  border: 2px dashed rgba(255, 255, 255, 0.9);
  border-radius: 50%;
  pointer-events: none;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.15);
}
.hint { color: var(--muted); font-size: 0.84rem; margin: 10px 0; }
.field-label { font-weight: 750; margin: 0 0 8px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.chip {
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 12px;
  padding: 8px 10px;
  font: inherit;
  font-size: 0.86rem;
  font-weight: 700;
  cursor: pointer;
  text-align: left;
  color: inherit;
}
.chip span { display: block; font-weight: 550; color: var(--muted); font-size: 0.75rem; }
.chip.is-on { border-color: var(--accent); background: #e8f2fc; color: var(--accent-dark); }
.chip:disabled { opacity: 0.55; cursor: wait; }
.actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.size-note { color: var(--muted); font-size: 0.84rem; }

@media (max-width: 760px) {
  .cards, .result, .studio { grid-template-columns: 1fr; }
  .result { grid-template-columns: 72px 1fr; }
  .download { grid-column: 2; justify-self: start; }
}