:root {
  color-scheme: light;
  --ink: #4a2d1f;
  --muted: #75594d;
  --blue: #149cf0;
  --pink: #ff4f86;
  --green: #47c91f;
  --yellow: #ffca28;
  --cream: #fffdf5;
  --card: rgba(255, 255, 255, 0.92);
  --line: rgba(74, 45, 31, 0.1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang TC", "Noto Sans TC", sans-serif;
  background:
    radial-gradient(circle at 12% 8%, rgba(255, 224, 92, .6), transparent 28rem),
    radial-gradient(circle at 88% 5%, rgba(107, 214, 255, .55), transparent 30rem),
    linear-gradient(180deg, #f2fbff 0%, #fff9e8 54%, #efffe7 100%);
}

a { color: #087ec5; }

.shell {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
  padding: 22px 0 56px;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 34px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  font-weight: 900;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  color: white;
  font-size: 24px;
  background: linear-gradient(145deg, var(--blue), #65d9ff);
  box-shadow: 0 10px 24px rgba(20, 156, 240, .25);
}

.nav-links { display: flex; flex-wrap: wrap; gap: 8px 18px; }
.nav-links a { color: var(--ink); text-decoration: none; font-weight: 750; }

.hero {
  padding: clamp(34px, 7vw, 72px);
  overflow: hidden;
  border: 2px solid rgba(255, 255, 255, .95);
  border-radius: 40px;
  background: var(--card);
  box-shadow: 0 24px 70px rgba(44, 111, 133, .16);
  text-align: center;
}

.app-icon {
  display: grid;
  place-items: center;
  width: 104px;
  height: 104px;
  margin: 0 auto 24px;
  border-radius: 28px;
  color: white;
  font-size: 48px;
  font-weight: 900;
  background: linear-gradient(145deg, #188ef1, #57d5f4 46%, #7bdc34);
  box-shadow: 0 18px 34px rgba(20, 156, 240, .26), inset 0 2px 0 rgba(255,255,255,.65);
}

h1, h2, h3 { margin-top: 0; line-height: 1.28; }
h1 { margin-bottom: 16px; font-size: clamp(34px, 6vw, 56px); letter-spacing: -.04em; }
h2 { margin-bottom: 14px; font-size: clamp(24px, 4vw, 32px); }
h3 { margin-bottom: 8px; font-size: 20px; }
p, li { color: var(--muted); font-size: 17px; line-height: 1.8; }
.lead { max-width: 660px; margin: 0 auto 28px; font-size: clamp(18px, 3vw, 22px); }

.badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 26px;
}

.badge {
  padding: 10px 16px;
  border-radius: 999px;
  background: #f4fbff;
  border: 1px solid #d8effc;
  color: #126897;
  font-weight: 800;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 20px;
}

.card, .article {
  padding: clamp(24px, 5vw, 42px);
  border: 1px solid rgba(255,255,255,.95);
  border-radius: 30px;
  background: var(--card);
  box-shadow: 0 16px 45px rgba(44, 111, 133, .11);
}

.card:nth-child(2) { background: rgba(255, 250, 229, .94); }
.card:nth-child(3) { background: rgba(244, 255, 236, .94); }
.card:nth-child(4) { background: rgba(255, 242, 247, .94); }
.card p { margin-bottom: 0; }

.article { max-width: 820px; margin: 0 auto; }
.article h1 { font-size: clamp(30px, 5vw, 44px); }
.article h2 { margin-top: 38px; }
.article ul { padding-left: 1.35em; }
.updated { margin-top: -6px; margin-bottom: 30px; color: #8c766c; font-size: 15px; }

.button {
  display: inline-block;
  padding: 14px 22px;
  border-radius: 16px;
  color: white;
  background: linear-gradient(135deg, #17a8f5, #087ecc);
  box-shadow: 0 10px 24px rgba(20, 156, 240, .22);
  font-weight: 850;
  text-decoration: none;
}

.footer {
  margin-top: 34px;
  color: #856d62;
  text-align: center;
  font-size: 14px;
}

@media (max-width: 680px) {
  .nav { align-items: flex-start; }
  .nav-links { justify-content: flex-end; font-size: 14px; }
  .grid { grid-template-columns: 1fr; }
  .hero { border-radius: 30px; }
}