:root {
  color-scheme: light dark;
  --nhc-bg: #f4f7fb;
  --nhc-surface: #ffffff;
  --nhc-surface-soft: #eef6ff;
  --nhc-text: #172033;
  --nhc-muted: #5d687b;
  --nhc-border: #d9e2ef;
  --nhc-primary: #1769aa;
  --nhc-primary-strong: #0f4f86;
  --nhc-ok: #138a58;
  --nhc-warn: #b66a06;
  --nhc-bad: #c23b3b;
  --nhc-unknown: #68758a;
  --nhc-shadow: 0 12px 32px rgba(27, 55, 90, 0.1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

.nhc-page {
  min-height: 70vh;
  background:
    radial-gradient(circle at 10% 0, rgba(61, 157, 255, 0.14), transparent 35rem),
    var(--nhc-bg);
}

.nhc-hero {
  padding: clamp(2.75rem, 7vw, 5rem) 1rem 2.5rem;
  text-align: center;
  background: linear-gradient(135deg, #0c4478, #1876b8 55%, #25a0b5);
  color: #fff;
}

.nhc-hero__eyebrow {
  margin: 0 0 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.nhc-hero h1 {
  margin: 0;
  font-size: clamp(2rem, 6vw, 4.25rem);
  line-height: 1.15;
  letter-spacing: 0.02em;
}

.nhc-hero__lead {
  max-width: 760px;
  margin: 1rem auto 0;
  font-size: clamp(1rem, 2.2vw, 1.3rem);
  line-height: 1.8;
}

.nhc-hero__privacy {
  max-width: 720px;
  margin: 1rem auto 0;
  color: #e2f5ff;
  font-size: 0.88rem;
}

.nhc-hero__landing-link {
  margin: 1.25rem 0 0;
}

.nhc-hero__landing-link a {
  color: #fff;
  text-decoration: underline;
  text-underline-offset: 0.25em;
}

.nhc-main {
  width: min(1120px, calc(100% - 2rem));
  margin: -1.25rem auto 0;
  padding-bottom: 4rem;
  position: relative;
}

.nhc-start,
.nhc-progress,
.nhc-summary,
.nhc-result-section,
.nhc-advice,
.nhc-technical {
  border: 1px solid var(--nhc-border);
  border-radius: 18px;
  background: var(--nhc-surface);
  box-shadow: var(--nhc-shadow);
}

.nhc-start {
  max-width: 760px;
  margin: 0 auto;
  padding: clamp(1.5rem, 5vw, 3rem);
  text-align: center;
}

.nhc-start__icon {
  width: 90px;
  height: 60px;
  margin: 0 auto 1.25rem;
  position: relative;
}

.nhc-start__icon span {
  position: absolute;
  left: 50%;
  bottom: 0;
  border: 6px solid var(--nhc-primary);
  border-bottom: 0;
  border-left-color: transparent;
  border-right-color: transparent;
  border-radius: 50% 50% 0 0;
  transform: translateX(-50%);
}

.nhc-start__icon span:nth-child(1) { width: 88px; height: 55px; }
.nhc-start__icon span:nth-child(2) { width: 57px; height: 36px; }
.nhc-start__icon span:nth-child(3) {
  width: 15px;
  height: 15px;
  border: 0;
  border-radius: 50%;
  background: var(--nhc-primary);
}

.nhc-start h2,
.nhc-progress h2,
.nhc-advice h2 {
  margin: 0 0 0.75rem;
}

.nhc-start p {
  margin: 0 auto 1.5rem;
  max-width: 620px;
  color: var(--nhc-muted);
  line-height: 1.8;
}

.nhc-button {
  min-height: 48px;
  padding: 0.75rem 1.4rem;
  border: 0;
  border-radius: 999px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

.nhc-button:hover {
  transform: translateY(-1px);
}

.nhc-button:focus-visible,
.nhc-result-nav a:focus-visible,
.nhc-technical summary:focus-visible {
  outline: 3px solid #f5a623;
  outline-offset: 3px;
}

.nhc-button--primary {
  background: var(--nhc-primary);
  color: #fff;
  box-shadow: 0 7px 18px rgba(23, 105, 170, 0.28);
}

.nhc-button--primary:hover {
  background: var(--nhc-primary-strong);
}

.nhc-button--secondary {
  background: var(--nhc-surface);
  color: var(--nhc-primary);
  border: 1px solid var(--nhc-primary);
}

a.nhc-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
}

.nhc-share-link--x {
  min-width: 7.5rem;
}

.nhc-share-link--line {
  min-width: 5.5rem;
}

.nhc-progress {
  max-width: 760px;
  margin: 0 auto;
  padding: 2rem;
  text-align: center;
}

.nhc-spinner {
  width: 58px;
  height: 58px;
  margin: 0 auto 1rem;
  border: 6px solid var(--nhc-border);
  border-top-color: var(--nhc-primary);
  border-radius: 50%;
  animation: nhc-spin 0.85s linear infinite;
}

@keyframes nhc-spin {
  to { transform: rotate(360deg); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .nhc-spinner { animation-duration: 2s; }
  .nhc-button { transition: none; }
}

.nhc-progress__track {
  height: 10px;
  margin-top: 1.25rem;
  overflow: hidden;
  border-radius: 999px;
  background: var(--nhc-border);
}

.nhc-progress__track span {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--nhc-primary), #28a6bb);
  transition: width 0.25s ease;
}

.nhc-results {
  display: grid;
  gap: 1.25rem;
}

.nhc-summary {
  padding: clamp(1.4rem, 4vw, 2.4rem);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(1.25rem, 4vw, 3rem);
}

.nhc-score-ring {
  width: 150px;
  aspect-ratio: 1;
  flex: 0 0 auto;
  display: grid;
  place-content: center;
  border-radius: 50%;
  background:
    radial-gradient(circle, var(--nhc-surface) 60%, transparent 62%),
    conic-gradient(var(--nhc-primary) var(--score-angle, 0deg), var(--nhc-border) 0);
  text-align: center;
}

.nhc-score-ring strong {
  font-size: 3rem;
  line-height: 1;
}

.nhc-score-ring span {
  color: var(--nhc-muted);
  font-weight: 700;
}

.nhc-summary__label {
  margin: 0;
  color: var(--nhc-muted);
  font-weight: 700;
}

.nhc-summary h2 {
  margin: 0.3rem 0;
  font-size: clamp(1.5rem, 4vw, 2.25rem);
}

.nhc-summary__copy > p:last-child {
  margin: 0;
  color: var(--nhc-muted);
}

.nhc-stars {
  color: #e79b16;
  font-size: 1.55rem;
  letter-spacing: 0.08em;
}

.nhc-actions,
.nhc-result-nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.nhc-share-note {
  margin: -0.5rem 0 0;
  color: var(--nhc-muted);
  font-size: 0.82rem;
  text-align: center;
}

.nhc-result-nav a {
  padding: 0.55rem 0.9rem;
  border-radius: 999px;
  color: var(--nhc-primary);
  background: var(--nhc-surface);
  border: 1px solid var(--nhc-border);
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
}

.nhc-section-list {
  display: grid;
  gap: 1.25rem;
}

.nhc-result-section {
  padding: clamp(1rem, 3vw, 1.5rem);
  scroll-margin-top: 1rem;
}

.nhc-result-section h2 {
  margin: 0 0 1rem;
  font-size: 1.35rem;
}

.nhc-card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
}

.nhc-card {
  min-width: 0;
  padding: 1rem;
  border: 1px solid var(--nhc-border);
  border-left: 5px solid var(--nhc-unknown);
  border-radius: 12px;
  background: var(--nhc-surface-soft);
}

.nhc-card--ok { border-left-color: var(--nhc-ok); }
.nhc-card--warn { border-left-color: var(--nhc-warn); }
.nhc-card--bad { border-left-color: var(--nhc-bad); }

.nhc-card__head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 0.75rem;
}

.nhc-card h3 {
  margin: 0;
  font-size: 1rem;
}

.nhc-card__badge {
  flex: 0 0 auto;
  padding: 0.18rem 0.55rem;
  border-radius: 999px;
  color: #fff;
  background: var(--nhc-unknown);
  font-size: 0.74rem;
  font-weight: 700;
}

.nhc-card--ok .nhc-card__badge { background: var(--nhc-ok); }
.nhc-card--warn .nhc-card__badge { background: var(--nhc-warn); }
.nhc-card--bad .nhc-card__badge { background: var(--nhc-bad); }

.nhc-card__value {
  margin: 0.6rem 0 0;
  font-size: 1.1rem;
  font-weight: 800;
  overflow-wrap: anywhere;
}

.nhc-card__detail {
  margin: 0.35rem 0 0;
  color: var(--nhc-muted);
  font-size: 0.85rem;
  line-height: 1.55;
}

.nhc-advice {
  padding: clamp(1.2rem, 4vw, 2rem);
}

.nhc-advice-list {
  display: grid;
  gap: 0.75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nhc-advice-list li {
  padding: 0.85rem 1rem;
  border-left: 4px solid var(--nhc-warn);
  border-radius: 8px;
  background: var(--nhc-surface-soft);
  line-height: 1.65;
}

.nhc-advice-list strong {
  display: block;
}

.nhc-technical {
  padding: 1rem 1.25rem;
}

.nhc-technical summary {
  cursor: pointer;
  font-weight: 700;
}

.nhc-technical li {
  margin: 0.5rem 0;
  color: var(--nhc-muted);
}

.nhc-noscript {
  padding: 1rem;
  border: 2px solid var(--nhc-bad);
  background: var(--nhc-surface);
}

[hidden] {
  display: none !important;
}

@media (max-width: 720px) {
  .nhc-main {
    width: min(100% - 1rem, 1120px);
  }

  .nhc-summary {
    flex-direction: column;
    text-align: center;
  }

  .nhc-score-ring {
    width: 130px;
  }

  .nhc-card-grid {
    grid-template-columns: 1fr;
  }

  .nhc-actions .nhc-button {
    width: 100%;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --nhc-bg: #0f1724;
    --nhc-surface: #182233;
    --nhc-surface-soft: #202e42;
    --nhc-text: #eef4fb;
    --nhc-muted: #b8c4d4;
    --nhc-border: #35455b;
    --nhc-primary: #58b4f4;
    --nhc-primary-strong: #79c6fb;
    --nhc-shadow: 0 12px 32px rgba(0, 0, 0, 0.28);
  }

  .nhc-button--primary {
    color: #09223a;
  }

  .nhc-button--secondary,
  .nhc-result-nav a {
    color: #9bd5ff;
  }
}