:root{
  --bg:#f5f7f6;
  --card:#ffffff;
  --text:#17231c;
  --muted:#66736b;
  --line:#dfe7e2;
  --accent:#3f9568;
  --accent-dark:#28704d;
  --accent-soft:#eaf5ee;
  --header:#1f6648;
  --shadow:0 12px 34px rgba(31,102,72,.06);
}

*{
  box-sizing:border-box;
}

body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",
    "Noto Sans JP","Yu Gothic",sans-serif;
  background:var(--bg);
  color:var(--text);
}

button{
  font:inherit;
  cursor:pointer;
}

.wrap{
  width:min(1050px,calc(100% - 36px));
  margin:auto;
}

.site-header{
  background:var(--header);
}

.brand{
  display:inline-flex;
  flex-direction:column;
  padding:16px 0;
  color:#fff;
  text-decoration:none;
}

.brand strong{
  font-size:18px;
}

.brand span{
  margin-top:2px;
  font-size:9px;
  letter-spacing:.17em;
  opacity:.7;
}

.main{
  padding-top:22px;
  padding-bottom:70px;
}

.breadcrumb{
  display:flex;
  gap:8px;
  margin-bottom:28px;
  color:var(--muted);
  font-size:13px;
}

.breadcrumb a{
  color:var(--accent-dark);
  text-decoration:none;
}

.hero{
  margin-bottom:24px;
}

.eyebrow{
  margin:0 0 5px;
  color:var(--accent-dark);
  font-size:11px;
  font-weight:800;
  letter-spacing:.15em;
}

.hero h1{
  margin:0 0 10px;
  font-size:clamp(35px,5vw,50px);
  letter-spacing:-.04em;
}

.hero>p:last-child{
  margin:0;
  color:var(--muted);
  line-height:1.8;
}

.speed-card{
  padding:30px;
  border-radius:20px;
  background:var(--header);
  color:#fff;
  box-shadow:var(--shadow);
}

.status-area{
  display:flex;
  justify-content:space-between;
  align-items:center;
  margin-bottom:26px;
}

.status-area span{
  font-size:12px;
  opacity:.8;
}

.status-area strong{
  padding:5px 10px;
  border-radius:999px;
  background:rgba(255,255,255,.12);
  font-size:10px;
  letter-spacing:.08em;
}

.primary-result{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:18px;
}

.main-meter{
  padding:22px;
  border:1px solid rgba(255,255,255,.17);
  border-radius:16px;
  background:rgba(255,255,255,.06);
  text-align:center;
}

.main-meter span,
.sub-results span{
  display:block;
  font-size:10px;
  font-weight:800;
  letter-spacing:.12em;
  opacity:.75;
}

.main-meter strong{
  display:block;
  margin-top:8px;
  font-size:clamp(45px,8vw,76px);
  line-height:1;
  letter-spacing:-.06em;
}

.main-meter small,
.sub-results small{
  opacity:.7;
}

.sub-results{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:12px;
  margin-top:14px;
}

.sub-results>div{
  padding:14px;
  border-radius:12px;
  background:rgba(255,255,255,.07);
  text-align:center;
}

.sub-results strong{
  display:inline-block;
  margin:6px 4px 0 0;
  font-size:25px;
}

.start-btn{
  width:100%;
  margin-top:22px;
  padding:15px;
  border:0;
  border-radius:12px;
  background:#fff;
  color:var(--header);
  font-weight:900;
  font-size:15px;
}

.start-btn:disabled{
  cursor:not-allowed;
  opacity:.55;
}

.copy-btn{
  width:100%;
  margin-top:9px;
  padding:11px;
  border:1px solid rgba(255,255,255,.3);
  border-radius:10px;
  background:transparent;
  color:#fff;
  font-weight:800;
}

.grade-card,
.info-card,
.notice-card{
  margin-top:18px;
  padding:23px;
  border:1px solid var(--line);
  border-radius:18px;
  background:#fff;
  box-shadow:var(--shadow);
}

.grade-card{
  display:flex;
  gap:24px;
  align-items:center;
  justify-content:space-between;
  background:#f7fbf8;
}

.grade-card span{
  display:block;
  color:var(--muted);
  font-size:10px;
}

.grade-card strong{
  display:block;
  margin-top:3px;
  font-size:22px;
}

.grade-card p{
  margin:0;
  color:var(--muted);
  font-size:12px;
  line-height:1.7;
}

.info-card h2,
.notice-card h2{
  margin:0;
  font-size:19px;
}

.info-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:20px;
  margin-top:17px;
}

.info-grid article{
  padding-left:14px;
  border-left:3px solid var(--accent-soft);
}

.info-grid strong{
  font-size:13px;
}

.info-grid p,
.notice-card p{
  margin:5px 0 0;
  color:var(--muted);
  font-size:12px;
  line-height:1.7;
}

.notice-card p{
  margin-top:10px;
}

.notice-card a{
  display:inline-block;
  margin-top:15px;
  color:var(--accent-dark);
  font-size:12px;
  font-weight:800;
  text-decoration:none;
}

.site-footer{
  padding:25px 0;
  border-top:1px solid var(--line);
  color:var(--muted);
  font-size:12px;
}

.site-footer .wrap{
  display:flex;
  justify-content:space-between;
}

.site-footer a{
  color:var(--accent-dark);
  text-decoration:none;
}

@media(max-width:700px){

  .primary-result{
    grid-template-columns:1fr;
  }

  .info-grid{
    grid-template-columns:1fr;
  }

}

@media(max-width:520px){

  .wrap{
    width:calc(100% - 24px);
  }

  .speed-card{
    padding:19px;
  }

  .main-meter{
    padding:17px;
  }

  .main-meter strong{
    font-size:54px;
  }

  .grade-card{
    display:block;
  }

  .grade-card p{
    margin-top:8px;
  }

  .info-card,
  .notice-card,
  .grade-card{
    padding:17px;
  }

}

/* =========================================================
   v0.2 Measurement metadata
   ========================================================= */

.measurement-meta{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:12px;
  margin-top:12px;
}

.measurement-meta>div{
  padding:11px 14px;
  border:1px solid rgba(255,255,255,.12);
  border-radius:11px;
  background:rgba(0,0,0,.06);
}

.measurement-meta span{
  display:block;
  margin-bottom:4px;
  font-size:9px;
  font-weight:800;
  letter-spacing:.08em;
  opacity:.65;
}

.measurement-meta strong{
  display:block;
  font-size:12px;
  overflow-wrap:anywhere;
}

@media(max-width:520px){

  .measurement-meta{
    grid-template-columns:1fr;
  }

}