:root {
  --bg: #0b1020;
  --bg-2: #111832;
  --panel: #151d3a;
  --line: #2a3563;
  --ink: #e8ecff;
  --ink-2: #a8b2d8;
  --ink-3: #6f7aa6;
  --brand: #ffd34d;
  --pixel: "DotGothic16", "Hiragino Kaku Gothic ProN", "Yu Gothic", monospace;
  --sans: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic UI", "Meiryo", system-ui, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.8;
  /* うっすらドット格子 */
  background-image:
    radial-gradient(circle at 1px 1px, rgba(255, 255, 255, .045) 1px, transparent 0);
  background-size: 16px 16px;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
:focus-visible { outline: 3px dashed var(--brand); outline-offset: 3px; }

.wrap { width: 100%; max-width: 1080px; margin: 0 auto; padding: 0 16px; }
@media (min-width: 720px) { .wrap { padding: 0 32px; } }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: rgba(11, 16, 32, .88);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; height: 60px; }
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; font-family: var(--pixel); font-size: 18px; letter-spacing: .04em; white-space: nowrap; }
.logo .dot { color: var(--brand); }
.logo-mark {
  width: 20px; height: 20px; flex: none;
  background:
    linear-gradient(var(--brand) 0 0) 0 0 / 8px 8px no-repeat,
    linear-gradient(#7fd4ff 0 0) 12px 0 / 8px 8px no-repeat,
    linear-gradient(#9bbc0f 0 0) 0 12px / 8px 8px no-repeat,
    linear-gradient(#ff7f9e 0 0) 12px 12px / 8px 8px no-repeat;
}
.nav { display: flex; gap: 4px; font-family: var(--pixel); font-size: 15px; }
.nav a { text-decoration: none; color: var(--ink-2); padding: 6px 10px; }
.nav a:hover { color: var(--ink); background: var(--panel); }
@media (max-width: 420px) {
  .logo { font-size: 15px; }
  .nav a { padding: 6px 6px; font-size: 13px; }
}

/* ---------- hero ---------- */
.hero { padding: 72px 0 56px; border-bottom: 1px solid var(--line); }
.hero-kicker { margin: 0 0 12px; font-family: var(--pixel); color: var(--brand); font-size: 15px; letter-spacing: .1em; }
.hero-kicker::after { content: ""; }
.hero-title { margin: 0; font-family: var(--pixel); font-weight: 400; font-size: clamp(28px, 6vw, 52px); line-height: 1.35; }
.hero-lead { margin: 20px 0 0; max-width: 34em; color: var(--ink-2); font-size: 16px; }
.hero-stats { list-style: none; margin: 28px 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 10px; }
.hero-stats li {
  font-family: var(--pixel); font-size: 14px; color: var(--ink-2);
  border: 1px solid var(--line); background: var(--bg-2); padding: 4px 12px;
}
.hero-stats b { color: var(--ink); font-weight: 400; margin-right: 4px; }

/* ---------- sections ---------- */
.section { padding: 56px 0; }
.section-title { margin: 0 0 28px; font-family: var(--pixel); font-weight: 400; font-size: 22px; letter-spacing: .08em; }
.section-title span { color: var(--brand); margin-right: 6px; }

/* ---------- game cards ---------- */
.games { display: grid; gap: 28px; grid-template-columns: 1fr; }
@media (min-width: 860px) { .games { grid-template-columns: 1fr 1fr; } }

.game {
  --accent: var(--brand);
  --media-bg: #000;
  display: flex; flex-direction: column;
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: 6px 6px 0 rgba(0, 0, 0, .35);
  transition: transform .15s, box-shadow .15s, border-color .15s;
}
.game:hover { transform: translate(-2px, -2px); box-shadow: 8px 8px 0 rgba(0, 0, 0, .35); border-color: var(--accent); }
.game-media { display: block; background: var(--media-bg); aspect-ratio: 16 / 10; overflow: hidden; border-bottom: 1px solid var(--line); }
.game-media img { width: 100%; height: 100%; object-fit: cover; image-rendering: pixelated; }
.game-body { display: flex; flex-direction: column; flex: 1; padding: 20px 20px 22px; }
.game-genre { margin: 0; font-family: var(--pixel); font-size: 13px; color: var(--accent); letter-spacing: .06em; }
.game-title { margin: 2px 0 10px; font-family: var(--pixel); font-weight: 400; font-size: 28px; line-height: 1.3; }
.game-desc { margin: 0; color: var(--ink-2); font-size: 15px; }
.game-tags { list-style: none; margin: 16px 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.game-tags li { font-size: 12px; color: var(--ink-2); background: var(--bg-2); border: 1px solid var(--line); padding: 1px 8px; }

.howto { margin: 16px 0 0; border-top: 1px dashed var(--line); padding-top: 12px; font-size: 14px; color: var(--ink-2); }
.howto summary { cursor: pointer; font-family: var(--pixel); color: var(--ink); list-style: none; }
.howto summary::-webkit-details-marker { display: none; }
.howto summary::before { content: "▸ "; color: var(--accent); }
.howto[open] summary::before { content: "▾ "; }
.howto dl { margin: 10px 0 0; display: grid; grid-template-columns: auto 1fr; gap: 6px 12px; }
.howto dt { font-family: var(--pixel); color: var(--accent); }
.howto dd { margin: 0; }
.howto p { margin: 10px 0 0; }

.play {
  align-self: flex-start; margin-top: 20px;
  font-family: var(--pixel); font-size: 18px; text-decoration: none;
  color: #0b1020; background: var(--accent);
  padding: 8px 22px;
  box-shadow: 4px 4px 0 rgba(0, 0, 0, .45);
  transition: transform .1s, box-shadow .1s;
}
.play:hover { transform: translate(-1px, -1px); box-shadow: 5px 5px 0 rgba(0, 0, 0, .45); }
.play:active { transform: translate(3px, 3px); box-shadow: 1px 1px 0 rgba(0, 0, 0, .45); }

/* ---------- about ---------- */
.about { border-top: 1px solid var(--line); background: rgba(17, 24, 50, .6); }
.about-text { max-width: 40em; color: var(--ink-2); font-size: 15px; }
.about-text p { margin: 0 0 12px; }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--line); padding: 28px 0 calc(28px + env(safe-area-inset-bottom)); color: var(--ink-3); font-size: 13px; }
.footer-inner p { margin: 0; }
.footer-inner p:first-child { font-family: var(--pixel); color: var(--ink-2); margin-bottom: 6px; }
.credit { font-size: 11px; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .game, .play { transition: none; }
}

/* ---------- video ---------- */
.video { margin: 16px 0 0; }
.video-frame, .video-empty {
  position: relative; aspect-ratio: 16 / 9; width: 100%;
  background: #05070f; border: 1px solid var(--line); overflow: hidden;
}
.video-frame iframe, .video-frame img { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; object-fit: cover; }
.video-frame button {
  position: absolute; inset: 0; width: 100%; height: 100%; padding: 0; border: 0; cursor: pointer;
  background: transparent; font-family: var(--pixel); color: #fff; font-size: 16px;
  display: flex; align-items: center; justify-content: center; text-shadow: 0 2px 6px #000;
}
.video-frame button span { background: rgba(0, 0, 0, .65); border: 2px solid var(--accent, var(--brand)); padding: 8px 18px; }
.video-label { margin: 0 0 6px; font-family: var(--pixel); font-size: 13px; color: var(--accent, var(--brand)); }
.video-empty { display: flex; align-items: center; justify-content: center; color: var(--ink-3); font-family: var(--pixel); font-size: 14px; border-style: dashed; }

/* ---------- coming soon ---------- */
.section-lead { margin: -12px 0 24px; color: var(--ink-2); font-size: 15px; max-width: 40em; }
.upcoming { border-top: 1px solid var(--line); }
.upcoming[hidden] { display: none; }
.trailers { display: grid; gap: 28px; grid-template-columns: 1fr; }
@media (min-width: 860px) { .trailers { grid-template-columns: 1fr 1fr; } }
.trailer { --accent: var(--brand); background: var(--panel); border: 1px solid var(--line); padding: 20px; box-shadow: 6px 6px 0 rgba(0, 0, 0, .35); }
.trailer .video { margin: 0 0 14px; }
.trailer-date { margin: 10px 0 0; font-family: var(--pixel); color: var(--accent); font-size: 14px; }

/* ---------- report ---------- */
.report { border-top: 1px solid var(--line); }
.bugform { display: grid; gap: 16px; max-width: 40em; }
.bugform label { display: grid; gap: 6px; font-family: var(--pixel); font-size: 14px; color: var(--ink); }
.bugform select, .bugform textarea, .bugform input {
  font: 16px/1.6 var(--sans); color: var(--ink); background: var(--bg-2);
  border: 2px solid var(--line); padding: 8px 10px; width: 100%; border-radius: 0;
}
.bugform select:focus, .bugform textarea:focus, .bugform input:focus { border-color: var(--brand); outline: none; }
.bugform .play { border: 0; cursor: pointer; --accent: var(--brand); }
.video-frame video { position: absolute; inset: 0; width: 100%; height: 100%; background: #000; object-fit: contain; }

/* ---------- 学校の端末についての注意 ---------- */
.school-note { background: #ffd34d; color: #3a1c00; font-weight: bold; font-size: 14px; line-height: 1.6; text-align: center; padding: 8px 16px; border-bottom: 2px solid #000; }

/* ---------- 折りたたみ動画 ---------- */
.vdetails { border: 1px solid var(--line); background: var(--bg-2); }
.vdetails summary { cursor: pointer; list-style: none; padding: 8px 12px; font-family: var(--pixel); font-size: 14px; color: var(--accent, var(--brand)); }
.vdetails summary::-webkit-details-marker { display: none; }
.vdetails summary::before { content: "▸ "; }
.vdetails[open] summary::before { content: "▾ "; }
.vdetails .video-frame { border-width: 1px 0 0; }
.video-err { margin: 0; padding: 8px 12px; font-size: 13px; color: var(--ink-2); }
.video-err a { color: var(--brand); }

/* ---------- BGM ボタン ---------- */
.bgm-btn { position: fixed; right: calc(12px + env(safe-area-inset-right)); bottom: calc(12px + env(safe-area-inset-bottom)); z-index: 20; font-family: var(--pixel); font-size: 14px; color: var(--ink-2); background: rgba(21, 29, 58, .94); border: 2px solid var(--line); padding: 8px 14px; cursor: pointer; white-space: nowrap; box-shadow: 3px 3px 0 rgba(0, 0, 0, .45); }
.bgm-btn:hover { color: var(--ink); border-color: var(--brand); }
.bgm-btn[aria-pressed="true"] { color: var(--brand); border-color: var(--brand); }