/* roadvania.com：ゲームと同じ配色（紙の色・焦げ茶の輪郭・赤いボタン・水の青）。外部フォントは使わない */
:root {
  --paper: #fbf7ea;
  --ground: #e8dfc6;
  --ink: #3a2e28;
  --muted: #6b5d50;
  --accent: #d2574e;
  --water: #4a8fdc;
  --line: #d8ccaa;
  --font: "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", system-ui, sans-serif;
  color-scheme: light;
}
* { box-sizing: border-box; }
html { background: var(--ground); }
body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font: 16px/1.75 var(--font);
}
a { color: var(--water); }
:focus-visible { outline: 3px solid var(--water); outline-offset: 2px; }
img { max-width: 100%; height: auto; }

.bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 16px;
  padding: 12px max(16px, env(safe-area-inset-right, 0px)) 12px max(16px, env(safe-area-inset-left, 0px));
  background: var(--ink);
  color: var(--paper);
}
.logo { color: var(--paper); font-weight: 800; font-size: 20px; letter-spacing: 0.04em; text-decoration: none; }
.bar nav { display: flex; flex-wrap: wrap; gap: 6px 14px; align-items: center; font-size: 14px; }
.bar nav a { color: var(--paper); text-decoration: none; }
.bar nav a:hover { text-decoration: underline; }
.play-mini { background: var(--accent); padding: 2px 12px; border-radius: 6px; }

main { max-width: 1040px; margin: 0 auto; padding: 32px max(16px, env(safe-area-inset-right, 0px)) 48px max(16px, env(safe-area-inset-left, 0px)); display: grid; gap: 40px; }

.hero { display: grid; grid-template-columns: 1fr 1.1fr; gap: 28px; align-items: center; }
.hero-text { min-width: 0; }
.hero h1 { margin: 0; font-size: clamp(40px, 7vw, 64px); line-height: 1.05; letter-spacing: 0.02em; color: var(--accent); text-shadow: 3px 3px 0 var(--ink); }
.tagline { margin: 8px 0 0; font-size: 22px; font-weight: 700; }
.lead { margin: 12px 0 0; color: var(--ink); max-width: 36em; }
.shot { margin: 0; border: 4px solid var(--ink); border-radius: 12px; overflow: hidden; box-shadow: 0 8px 0 rgba(0, 0, 0, 0.2); background: var(--paper); }
.shot img { display: block; image-rendering: pixelated; }

.play {
  display: inline-block;
  margin-top: 16px;
  padding: 12px 24px;
  border: 4px solid var(--ink);
  border-radius: 14px;
  background: var(--accent);
  color: #fff;
  font: 700 18px/1.3 var(--font);
  text-decoration: none;
  box-shadow: 0 6px 0 rgba(0, 0, 0, 0.25);
  cursor: pointer;
}
.play:active { transform: translateY(3px); box-shadow: 0 3px 0 rgba(0, 0, 0, 0.25); }
.note { font-size: 13px; color: var(--muted); margin: 8px 0 0; }
.warn { font-size: 14px; color: var(--accent); }

.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.features article { background: var(--paper); border: 3px solid var(--ink); border-radius: 12px; padding: 16px; min-width: 0; }
.features h2 { margin: 6px 0 4px; font-size: 17px; }
.features p { margin: 0; font-size: 14px; color: var(--muted); }
.ico { font-size: 26px; line-height: 1; }

.how, .doc { background: var(--paper); border: 3px solid var(--ink); border-radius: 12px; padding: 20px 22px; }
.how h2, .doc h1 { margin: 0 0 8px; }
.doc h1 { font-size: 26px; }
.doc h2 { font-size: 18px; margin: 20px 0 6px; }
.doc ul { padding-left: 1.3em; }
.doc li { margin: 4px 0; }
.how ol { padding-left: 1.4em; }

.form { display: grid; gap: 12px; margin-top: 16px; max-width: 560px; }
.form label { display: grid; gap: 4px; font-size: 14px; font-weight: 700; }
.form input, .form select, .form textarea {
  font: 400 15px/1.5 var(--font);
  padding: 8px 10px;
  border: 2px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  width: 100%;
}
.form button { justify-self: start; }
.form button[disabled] { opacity: 0.6; cursor: default; }
.status { font-weight: 700; min-height: 1.5em; margin: 0; }

.foot { padding: 20px max(16px, env(safe-area-inset-right, 0px)) 32px max(16px, env(safe-area-inset-left, 0px)); text-align: center; font-size: 13px; color: var(--muted); }

@media (max-width: 760px) {
  .hero { grid-template-columns: 1fr; }
  .features { grid-template-columns: 1fr; }
}
@media (min-width: 761px) and (max-width: 980px) {
  .features { grid-template-columns: repeat(2, 1fr); }
}
@media (prefers-reduced-motion: reduce) {
  .play:active { transform: none; }
}