/* base.css */
:root {
  --bg: #fff8ef;
  --surface: #ffffff;
  --surface-soft: #fffdf9;
  --text: #20324d;
  --text-soft: #5d7186;
  --line: #dfe7ef;
  --brand: #2e9fb1;
  --brand-deep: #13798c;
  --yellow: #f6d75b;
  --pink: #f4c5d9;
  --green: #d8e7d1;
  --mint: #b7e7d1;
  --orange: #f2a36b;
  --shadow: 0 14px 40px rgba(23, 53, 81, 0.10);
  --radius: 24px;
  --radius-sm: 16px;
  --container: min(1180px, calc(100vw - 32px));
  --header-height: 76px;
}

body {
  font-family: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(244, 197, 217, 0.5), transparent 28%),
    radial-gradient(circle at top right, rgba(246, 215, 91, 0.45), transparent 24%),
    linear-gradient(180deg, #fff9f1 0%, #f7fbff 100%);
  color: var(--text);
}

body.menu-open { overflow: hidden; }

main { display: block; }
section { padding: 56px 0; }
@media (min-width: 768px) {
  section { padding: 72px 0; }
}

.container { width: var(--container); margin-inline: auto; }

h1, h2, h3, h4 {
  line-height: 1.18;
  letter-spacing: 0.01em;
}

h1 { font-size: clamp(2rem, 5vw, 4rem); font-weight: 900; }
h2 { font-size: clamp(1.65rem, 3vw, 2.5rem); font-weight: 800; }
h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); font-weight: 800; }
h4 { font-size: 1.05rem; font-weight: 800; }

p { color: var(--text-soft); }
small, .small { font-size: 1rem; color: var(--text-soft); }
strong { color: var(--text); }

.page-shell { min-height: 100vh; }
.page-main { padding-top: var(--header-height); }

.section-head {
  display: grid;
  gap: 12px;
  margin-bottom: 24px;
}
.section-head p {
  max-width: 70ch;
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  width: fit-content;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(46, 159, 177, 0.1);
  color: var(--brand-deep);
  font-size: 0.92rem;
  font-weight: 700;
}

.theme-dot {
  width: 12px; height: 12px; border-radius: 999px; display: inline-block;
}

.muted { color: var(--text-soft); }
.text-center { text-align: center; }
.text-right { text-align: right; }
.hidden { display: none !important; }
.visually-hidden {
  position: absolute !important;
  clip: rect(0 0 0 0); clip-path: inset(50%);
  width: 1px; height: 1px;
  overflow: hidden; white-space: nowrap;
}

.flow > * + * { margin-top: 16px; }
.grid { display: grid; gap: 18px; }
.grid-2 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(1, minmax(0, 1fr)); }

@media (min-width: 640px) {
  .grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 768px) {
  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 1024px) {
  .grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

.surface {
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.65);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.content-stack > * + * { margin-top: 20px; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 34px;
  padding: 6px 12px;
  border-radius: 999px;
  background: #eff7fb;
  color: var(--brand-deep);
  font-size: 0.9rem;
  font-weight: 700;
}

.badge-outline {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--text-soft);
}

.note-box {
  padding: 16px 18px;
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(46,159,177,0.09), rgba(244,197,217,0.16));
  border: 1px dashed rgba(46,159,177,0.35);
}