:root{
  --bg:#fafafa; --card:#fff; --text:#111; --muted:#666; --line:#e7e7e7;
  --primary:#111; --danger:#b00020;
  --radius:16px;
  --shadow: 0 10px 30px rgba(0,0,0,.06);
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, "Noto Sans KR", "Apple SD Gothic Neo", Arial, sans-serif;
}

*{ box-sizing:border-box; }
body{ margin:0; font-family:var(--sans); background:var(--bg); color:var(--text); }

.topbar{
  position:sticky; top:0;
  background:rgba(250,250,250,.85);
  backdrop-filter: blur(10px);
  border-bottom:1px solid var(--line);
  display:flex; align-items:center; gap:16px;
  padding:14px 18px;
}
.brand{ font-weight:700; text-decoration:none; color:var(--text); letter-spacing:.2px; }
.nav{ display:flex; gap:12px; flex-wrap:wrap; }
.nav-link{ text-decoration:none; color:var(--muted); font-size:14px; padding:6px 8px; border-radius:10px; }
.nav-link.active{ color:var(--text); background:#efefef; }

.container{ max-width:960px; margin:0 auto; padding:28px 18px; }

.card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  padding:22px;
}

.row{ display:flex; align-items:center; }
.space-between{ justify-content:space-between; }
.gap{ gap:10px; }
.mt{ margin-top:12px; }

.label{ font-size:12px; color:var(--muted); }
.mode{ font-size:18px; font-weight:700; margin-top:4px; }
.hint{ font-size:12px; color:var(--muted); }

.timer{ text-align:center; padding:22px 0 8px; }
.time{ font-family:var(--mono); font-size:72px; letter-spacing:1px; line-height:1; }
.sub{ color:var(--muted); margin-top:10px; font-size:14px; }

.controls{ display:flex; gap:10px; justify-content:center; padding:16px 0 8px; }
.btn{
  border:1px solid var(--line);
  background:#fff;
  border-radius:12px;
  padding:10px 14px;
  font-size:14px;
  cursor:pointer;
}
.btn:hover{ background:#f4f4f4; }
.btn-primary{ background:var(--primary); color:#fff; border-color:var(--primary); }
.btn-primary:hover{ background:#000; }
.btn-danger{ border-color:#ffd3da; color:var(--danger); }
.btn-danger:hover{ background:#fff3f5; }

.sep{ border:none; border-top:1px solid var(--line); margin:18px 0; }

.grid2{ display:grid; grid-template-columns: 1fr 1fr; gap:14px; }
@media (max-width: 820px){ .grid2{ grid-template-columns:1fr; } .time{ font-size:56px; } }

.block{ padding:12px; border:1px solid var(--line); border-radius:14px; background:#fff; }
.small{ font-size:12px; color:var(--muted); margin-top:8px; }

.chips{ display:flex; flex-wrap:wrap; gap:8px; margin-top:8px; }
.chip{
  border:1px solid var(--line);
  background:#fff;
  border-radius:999px;
  padding:8px 10px;
  font-size:13px;
  cursor:pointer;
}
.chip:hover{ background:#f4f4f4; }

.input{
  width:100%;
  border:1px solid var(--line);
  border-radius:12px;
  padding:10px 12px;
  font-size:14px;
  background:#fff;
}

.field span{ display:block; font-size:12px; color:var(--muted); margin-bottom:6px; }
.kpi{ font-family:var(--mono); font-size:14px; margin-top:6px; color:var(--text); }

.details summary{ cursor:pointer; color:var(--text); font-weight:600; }

.hero{ padding:4px 2px 2px; }
.hero-title{ margin:0; font-size:32px; letter-spacing:-.2px; }
.hero-sub{ margin:10px 0 0; color:var(--muted); }
.hero-actions{ display:flex; gap:10px; margin-top:16px; flex-wrap:wrap; }
.hero-chips{ margin-top:14px; }
.hero-note{ margin-top:10px; }

.footer{
  display:flex; justify-content:space-between; gap:12px;
  border-top:1px solid var(--line);
  margin-top:18px; padding-top:14px;
}