:root {
  --bg: #ffffff;
  --ink: #111111;
  --muted: #6b6b6b;
  --line: #e8e8e8;
  --accent: #111111;
  --soft: #f5f5f5;
  --danger: #b42318;
  --radius: 18px;
  --font: "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --display: "Avenir Next", "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(circle at top, #fafafa 0%, transparent 42%),
    linear-gradient(180deg, #ffffff 0%, #f7f7f7 100%);
  color: var(--ink);
  font-family: var(--font);
}

body {
  min-height: 100dvh;
}

.shell {
  width: min(560px, calc(100% - 2rem));
  margin: 0 auto;
  padding: clamp(2.5rem, 8vh, 5rem) 0 3rem;
}

.brand {
  margin-bottom: 2.25rem;
}

.logo {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(2.4rem, 8vw, 3.4rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1;
}

.tagline {
  margin: 0.55rem 0 0;
  color: var(--muted);
  font-size: 1rem;
}

.panel {
  display: grid;
  gap: 1rem;
}

.field {
  display: grid;
  gap: 0.55rem;
}

.field span {
  font-size: 0.92rem;
  color: var(--muted);
}

input[type="tel"] {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--ink);
  font: inherit;
  font-size: 1.15rem;
  padding: 1rem 1.1rem;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input[type="tel"]:focus {
  border-color: #111;
  box-shadow: 0 0 0 4px rgba(17, 17, 17, 0.06);
}

.notice {
  margin: 0;
  color: #b0b0b0;
  font-size: 0.75rem;
  line-height: 1.35;
}

.cta,
.ghost {
  appearance: none;
  border: 0;
  border-radius: 999px;
  cursor: pointer;
  font: inherit;
  font-weight: 600;
  padding: 0.95rem 1.35rem;
  transition: transform 0.15s ease, opacity 0.15s ease, background 0.15s ease;
}

.cta {
  background: var(--accent);
  color: #fff;
}

.cta:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.cta:not(:disabled):hover,
.ghost:hover {
  transform: translateY(-1px);
}

.ghost {
  background: var(--soft);
  color: var(--ink);
  justify-self: start;
}

.error {
  margin: 0;
  color: var(--danger);
  font-size: 0.92rem;
}

.phase {
  margin: 0;
  font-size: 1.05rem;
  color: var(--muted);
}

.meter {
  height: 8px;
  border-radius: 999px;
  background: var(--soft);
  overflow: hidden;
}

.bar {
  width: 12%;
  height: 100%;
  border-radius: inherit;
  background: var(--ink);
  transition: width 0.35s ease;
}

.result-label {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.scores {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

.scores article {
  padding: 1.1rem 0.4rem;
  text-align: center;
}

.value {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(1.7rem, 7vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1;
}

.unit {
  margin: 0.45rem 0 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.wifi {
  margin-top: 0.75rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 0.65rem;
}

.wifi-title {
  margin: 0;
  font-family: var(--display);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.wifi-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.4;
}

.wifi-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

.wifi-list li {
  display: grid;
  gap: 0.2rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--line);
}

.wifi-list li:last-child {
  border-bottom: 0;
}

.wifi-name {
  margin: 0;
  font-weight: 600;
}

.wifi-meta {
  margin: 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.wifi-link {
  color: var(--ink);
  font-size: 0.86rem;
  text-decoration: underline;
  text-underline-offset: 2px;
}

@media (max-width: 420px) {
  .scores {
    grid-template-columns: 1fr;
  }

  .scores article {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: baseline;
    gap: 0.5rem;
    text-align: left;
    padding: 0.7rem 0;
    border-bottom: 1px solid var(--line);
  }

  .scores article:last-child {
    border-bottom: 0;
  }

  .unit {
    margin: 0;
  }
}