:root {
  --ink: #0f1b2d;
  --muted: #56627a;
  --bg: #ffffff;
  --soft: #f3f6fa;
  --line: #e2e7ef;
  --accent: #1d5fd1;
  --accent-ink: #ffffff;
  --warm: #f29f05;
  --card: #ffffff;
  --radius: 14px;
  --max: 1080px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e8edf5;
    --muted: #a5b0c2;
    --bg: #0c1422;
    --soft: #111c2e;
    --line: #22314a;
    --accent: #5b94f5;
    --accent-ink: #0c1422;
    --card: #132036;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; display: block; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }

/* header */
.top { border-bottom: 1px solid var(--line); background: var(--bg); position: sticky; top: 0; z-index: 5; }
.top .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 750; letter-spacing: -0.01em; white-space: nowrap; }
.brand:hover { text-decoration: none; }
.brand .mark { width: 32px; height: 32px; border-radius: 8px; background: var(--accent); color: var(--accent-ink); display: grid; place-items: center; font-weight: 800; }
.brand small { font-weight: 500; color: var(--muted); }
nav { white-space: nowrap; }
nav a { color: var(--muted); margin-left: 18px; font-size: 15px; }
nav a:hover { color: var(--ink); text-decoration: none; }

/* hero */
.hero { padding: 72px 0 56px; background: linear-gradient(180deg, var(--soft), var(--bg)); }
.hero h1 { font-size: clamp(32px, 5vw, 50px); line-height: 1.1; letter-spacing: -0.02em; margin: 0 0 16px; max-width: 16em; }
.hero p { font-size: 19px; color: var(--muted); max-width: 38em; margin: 0 0 28px; }
.btn { display: inline-block; padding: 11px 20px; border-radius: 10px; background: var(--accent); color: var(--accent-ink); font-weight: 650; }
.btn:hover { text-decoration: none; filter: brightness(1.07); }
.btn.ghost { background: transparent; color: var(--ink); border: 1px solid var(--line); margin-left: 8px; }

/* sections */
section { padding: 56px 0; }
section.alt { background: var(--soft); }
h2 { font-size: 28px; line-height: 1.25; letter-spacing: -0.01em; margin: 0 0 8px; }
.lead { color: var(--muted); margin: 0 0 28px; max-width: 42em; }
.grid { display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.card h3 { margin: 0 0 6px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 15.5px; }

/* game feature */
.game { display: grid; grid-template-columns: 220px 1fr; gap: 28px; align-items: center; }
.game img { border-radius: 22%; box-shadow: 0 10px 30px rgba(0,0,0,.18); }
.game h3 { font-size: 24px; margin: 0 0 6px; }
.pill { display: inline-block; font-size: 13px; font-weight: 650; padding: 3px 10px; border-radius: 99px; background: rgba(242,159,5,.16); color: #9a5b00; margin-bottom: 10px; }
@media (prefers-color-scheme: dark) { .pill { color: #ffc555; } }
@media (max-width: 640px) {
  .game { grid-template-columns: 1fr; }
  .game img { width: 160px; }
  nav a { margin-left: 12px; }
  .brand small { display: none; }
}
@media (max-width: 480px) {
  nav a { margin-left: 12px; font-size: 14.5px; }
  nav a.hide-sm { display: none; }
  .brand { gap: 8px; font-size: 15px; }
  .brand .mark { width: 28px; height: 28px; }
  .btn.ghost { margin: 10px 0 0; }
}

/* article pages */
.page { padding: 48px 0 64px; }
.page h1 { font-size: clamp(28px, 4vw, 40px); letter-spacing: -0.02em; margin: 0 0 6px; }
.page .meta { color: var(--muted); margin: 0 0 28px; }
.page h2 { font-size: 21px; margin: 32px 0 8px; }
.page p, .page li { max-width: 46em; }
.page ul { padding-left: 1.2em; }
.hero-img { border-radius: var(--radius); margin: 8px 0 28px; }
.faq dt { font-weight: 650; margin-top: 18px; }
.faq dd { margin: 4px 0 0; color: var(--muted); max-width: 46em; }

/* footer */
footer { border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--muted); font-size: 14.5px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 10px 24px; justify-content: space-between; }
footer a { color: var(--muted); margin-right: 16px; }
footer .tm { flex-basis: 100%; font-size: 13px; }