:root {
  --bg: #eef7f4;
  --surface: #ffffff;
  --surface-soft: #f7fbfa;
  --text: #17312b;
  --muted: #5c716c;
  --primary: #087f6f;
  --primary-dark: #065c52;
  --primary-soft: #dff4ef;
  --accent: #2854a3;
  --accent-soft: #e7eefc;
  --warning-soft: #fff5df;
  --border: #d8e6e2;
  --shadow: 0 24px 70px rgba(22, 70, 61, 0.13);
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 12px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(8, 127, 111, 0.2), transparent 34rem),
    linear-gradient(180deg, #f8fdfb 0%, var(--bg) 48%, #f7fbfa 100%);
  color: var(--text);
  font-family:
    "Noto Sans TC",
    "PingFang TC",
    "Microsoft JhengHei",
    system-ui,
    sans-serif;
  font-size: 16px;
  line-height: 1.7;
}

a {
  color: var(--primary-dark);
}

button,
input,
select {
  font: inherit;
}

button,
select,
input[type="checkbox"] {
  cursor: pointer;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 3px solid rgba(40, 84, 163, 0.55);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: 1rem;
  z-index: 20;
  transform: translateY(-150%);
  border-radius: 999px;
  background: var(--text);
  color: #fff;
  padding: 0.6rem 1rem;
}

.skip-link:focus {
  transform: translateY(0);
}

.hero {
  margin: 0 auto;
  max-width: 1180px;
  padding: 1.25rem 1.25rem 2.5rem;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.brand-mark {
  display: inline-block;
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 50%;
  background:
    linear-gradient(var(--primary), var(--primary)) center / 0.28rem 1rem no-repeat,
    linear-gradient(var(--primary), var(--primary)) center / 1rem 0.28rem no-repeat,
    var(--primary-soft);
  border: 1px solid rgba(8, 127, 111, 0.24);
}

.source-link {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.76);
  padding: 0 1rem;
  font-weight: 700;
  text-decoration: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(280px, 0.75fr);
  gap: 1.5rem;
  align-items: end;
  padding: 5rem 0 2rem;
}

.hero-copy h1 {
  max-width: 820px;
  margin: 0;
  font-size: clamp(2.3rem, 6vw, 5.3rem);
  line-height: 1.05;
  letter-spacing: -0.06em;
}

.hero-copy p:last-child {
  max-width: 690px;
  margin: 1.25rem 0 0;
  color: var(--muted);
  font-size: 1.1rem;
}

.eyebrow {
  margin: 0 0 0.65rem;
  color: var(--primary-dark);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.hero-card,
.checker-card,
.summary-card,
.guide-grid article,
.sources {
  border: 1px solid rgba(216, 230, 226, 0.9);
  background: rgba(255, 255, 255, 0.86);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}

.hero-card {
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}

.hero-card strong {
  display: block;
  margin-bottom: 0.4rem;
  font-size: 1.15rem;
}

.hero-card p,
.guide-grid p,
.sources p {
  margin: 0;
  color: var(--muted);
}

.page-shell {
  width: min(1180px, calc(100% - 2.5rem));
  margin: 0 auto;
}

.checker-card {
  border-radius: var(--radius-lg);
  padding: clamp(1.25rem, 3vw, 2rem);
}

.section-heading {
  margin-bottom: 1.25rem;
}

.section-heading h2,
.summary-card h2,
.guide-grid h2,
.sources h2 {
  margin: 0;
  font-size: clamp(1.45rem, 3vw, 2rem);
  line-height: 1.25;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.field,
.field-set {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface-soft);
  padding: 1rem;
}

.field label,
.field-set legend {
  color: var(--text);
  font-weight: 800;
}

.field label {
  display: block;
  margin-bottom: 0.45rem;
}

.field input,
.field select {
  width: 100%;
  min-height: 50px;
  border: 1px solid #c6d9d4;
  border-radius: var(--radius-sm);
  background: #fff;
  color: var(--text);
  padding: 0 0.9rem;
}

.field-set {
  grid-column: span 2;
  display: grid;
  gap: 0.75rem;
  margin: 0;
}

.field-set legend {
  padding: 0 0.35rem;
}

.check-row {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  min-height: 44px;
  color: var(--muted);
}

.check-row input {
  width: 1.2rem;
  height: 1.2rem;
  margin-top: 0.25rem;
  accent-color: var(--primary);
}

.result-layout {
  padding: 1.5rem 0 0;
}

.summary-card {
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}

.summary-card p:last-child {
  margin: 0.5rem 0 0;
  color: var(--muted);
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding: 1rem 0;
}

.tab {
  min-height: 44px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: #fff;
  color: var(--text);
  padding: 0 1.15rem;
  font-weight: 800;
  transition:
    background 180ms ease,
    color 180ms ease,
    transform 180ms ease;
}

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

.tab.active {
  border-color: var(--primary);
  background: var(--primary);
  color: #fff;
}

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

.result-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  padding: 1.25rem;
  box-shadow: 0 14px 36px rgba(23, 49, 43, 0.08);
}

.result-card.self {
  background: linear-gradient(180deg, #fff 0%, #fbfcff 100%);
}

.card-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
}

.badge {
  border-radius: 999px;
  padding: 0.18rem 0.65rem;
  font-size: 0.78rem;
  font-weight: 900;
}

.badge.public {
  background: var(--primary-soft);
  color: var(--primary-dark);
}

.badge.self {
  background: var(--accent-soft);
  color: var(--accent);
}

.result-card h3 {
  margin: 0.85rem 0 0.35rem;
  font-size: 1.22rem;
  line-height: 1.35;
}

.frequency {
  margin: 0 0 0.65rem;
  color: var(--primary-dark);
  font-weight: 900;
}

.result-card p {
  margin: 0.6rem 0 0;
  color: var(--muted);
}

.result-card .details {
  border-top: 1px solid var(--border);
  margin-top: 0.9rem;
  padding-top: 0.9rem;
  color: #3f5751;
}

.empty-state {
  grid-column: 1 / -1;
  border: 1px dashed #b7cbc6;
  border-radius: var(--radius-md);
  background: var(--warning-soft);
  padding: 1.25rem;
  color: #6f5316;
}

.guide-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  padding: 1.5rem 0;
}

.guide-grid article,
.sources {
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}

.guide-grid ul {
  margin: 0.75rem 0 0;
  padding-left: 1.25rem;
  color: var(--muted);
}

.sources {
  margin-bottom: 1.5rem;
}

.source-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
}

.source-actions a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  background: var(--primary-soft);
  padding: 0 1rem;
  font-weight: 800;
  text-decoration: none;
}

.footer {
  padding: 2rem 1.25rem 2.5rem;
  color: var(--muted);
  text-align: center;
}

.footer p {
  margin: 0;
}

@media (max-width: 820px) {
  .hero-grid,
  .form-grid,
  .results-grid,
  .guide-grid {
    grid-template-columns: 1fr;
  }

  .hero-grid {
    padding-top: 3rem;
  }

  .field-set {
    grid-column: span 1;
  }
}

@media (max-width: 560px) {
  .hero {
    padding-inline: 1rem;
  }

  .page-shell {
    width: min(100% - 2rem, 1180px);
  }

  .topbar {
    align-items: flex-start;
  }

  .source-link {
    padding-inline: 0.8rem;
  }

  .hero-copy h1 {
    letter-spacing: -0.045em;
  }

  .checker-card,
  .summary-card,
  .guide-grid article,
  .sources,
  .result-card {
    border-radius: 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}