:root {
  --bg: #f4f4f6;
  --card: #ffffff;
  --ink: #17181d;
  --muted: #6b707c;
  --line: #e7e7ec;
  --radius: 18px;
  --shadow: 0 10px 30px rgba(20, 20, 40, 0.08);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: ui-sans-system, -apple-system, "Segoe UI", Inter, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  min-height: 100vh;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 22px;
  background: var(--card);
  border-bottom: 1px solid var(--line);
}

.brand { display: flex; gap: 10px; align-items: center; text-decoration: none; color: inherit; }
.brand h1 { margin: 0; font-size: 18px; letter-spacing: -0.02em; }
.brand-logo {
  width: 32px; height: 32px;
  border-radius: 8px;
  object-fit: contain;
  display: block;
}

.steps { display: flex; gap: 8px; align-items: center; }
.dot { font-size: 12px; font-weight: 800; color: var(--muted); padding: 6px 12px; border-radius: 999px; background: #f1f1f5; }
.dot.active { background: #17181d; color: #fff; }
.dot-sep { color: var(--muted); font-size: 12px; }

.wrap { max-width: 680px; margin: 0 auto; padding: 28px 16px 40px; min-height: calc(100vh - 70px); }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 32px 28px;
  text-align: center;
}
.card h2 { margin: 0; font-size: 22px; letter-spacing: -0.02em; }
.muted { color: var(--muted); font-size: 14px; margin: 6px 0 0; }
.hidden { display: none; }

.recorder { margin: 28px 0 12px; display: grid; justify-items: center; gap: 12px; }
.record-btn {
  width: 88px; height: 88px; border-radius: 50%;
  border: 1px solid var(--line);
  background: #fafafc;
  cursor: pointer;
  display: grid; place-items: center;
}
.record-btn:hover { background: #f1f1f5; }
.record-dot { width: 28px; height: 28px; border-radius: 50%; background: #d92d20; }
.record-btn.recording { background: #fef3f2; border-color: #f3c2bd; }
.record-btn.recording .record-dot { animation: pulse 1s infinite; border-radius: 8px; }
@keyframes pulse { 50% { opacity: 0.4; } }

.timer { font-size: 30px; font-weight: 800; font-variant-numeric: tabular-nums; }
.status { font-size: 13px; color: var(--muted); }

.level { height: 6px; background: #efeff3; border-radius: 99px; overflow: hidden; margin: 18px 0 14px; }
.level div { height: 100%; width: 0%; background: #17181d; border-radius: 99px; }

.link {
  background: none; border: 0; color: var(--muted);
  font-size: 13px; font-weight: 700; cursor: pointer;
  text-decoration: underline; text-underline-offset: 3px;
}
.link:hover { color: var(--ink); }
.back { display: block; margin: 0 auto 8px; }

.canvas-wrap {
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #101216;
  margin-top: 18px;
}
.canvas-wrap.transparent {
  background-color: #fff;
  background-image: linear-gradient(45deg, #e9e9ee 25%, transparent 25%), linear-gradient(-45deg, #e9e9ee 25%, transparent 25%), linear-gradient(45deg, transparent 75%, #e9e9ee 75%), linear-gradient(-45deg, transparent 75%, #e9e9ee 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0;
}
#waveCanvas { width: 100%; height: auto; display: block; }

.opt { margin-top: 18px; }
.label { font-size: 11px; font-weight: 800; text-transform: uppercase; letter-spacing: 0.07em; color: var(--muted); margin: 0 0 10px; }
.swatches { display: flex; gap: 10px; justify-content: center; }
.swatch {
  width: 34px; height: 34px; border-radius: 50%;
  border: 2px solid #fff;
  outline: 1px solid var(--line);
  cursor: pointer; padding: 0;
}
.swatch.active { outline: 2px solid var(--ink); }

.player {
  display: flex; gap: 10px; align-items: center;
  margin: 20px 0 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px 12px;
  background: #fafafc;
  text-align: left;
}
.play-btn {
  width: 40px; height: 40px; border-radius: 50%;
  border: 0; background: #17181d; color: #fff;
  font-size: 14px; cursor: pointer; flex-shrink: 0;
}
#trackName { flex: 1; font-size: 13px; font-weight: 700; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.time { font-size: 12px; color: var(--muted); font-variant-numeric: tabular-nums; white-space: nowrap; }

.btn {
  border-radius: 12px;
  padding: 12px 16px;
  font-size: 14px;
  font-weight: 800;
  cursor: pointer;
  border: 1px solid transparent;
}
.btn-primary {
  background: linear-gradient(135deg, #8b68ff 0%, #6d3df5 100%);
  color: #fff;
  box-shadow: 0 6px 16px rgba(109, 61, 245, 0.28);
}
.btn-primary:hover { filter: brightness(1.04); }
.big { width: 100%; padding: 14px; font-size: 15px; }
.btn-share {
  background: #fff;
  border-color: var(--line);
  color: var(--ink);
  margin-top: 10px;
}
.btn-share:hover { background: #f6f6f9; }
#shareStatus { min-height: 18px; margin: 8px 0 0; }

.seo {
  max-width: 680px;
  margin: 0 auto;
  padding: 28px 24px 48px;
  text-align: left;
}
.seo h2 { font-size: 20px; letter-spacing: -0.01em; margin: 0 0 10px; }
.seo h3 { font-size: 15px; margin: 22px 0 8px; }
.seo p, .seo li { font-size: 14px; line-height: 1.65; color: #3a3e48; }
.seo p strong { color: var(--ink); }
.seo ol, .seo ul { margin: 0; padding-left: 20px; }
.seo li { margin: 4px 0; }

.foot {
  text-align: center;
  font-size: 12px;
  color: var(--muted);
  padding: 20px 16px 28px;
}