/* シグナレス 公式サイト（coming-soon の style.css・about.css をもとにした1枚のページ） */

:root {
  --bg: #0a1222;
  --ink: #f1f4f9;
  --ink-sub: #b7c2d4;
  --ink-body: #d2dbe8;
  --line: rgba(255, 255, 255, 0.22);
  --panel: rgba(8, 12, 20, 0.5);
  --go: #3ee08f;      /* 信号の青（プレイのボタン） */
  --caution: #ffc24a; /* 信号の黄（注意書き） */
}

* { box-sizing: border-box; }
html, body { margin: 0; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  position: relative;
  color: var(--ink);
  background: var(--bg);
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Yu Gothic", "Meiryo", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* 背景：ピントの外れた夕暮れの景色（bg.jpg は coming-soon/_src/make_bg.py から作る）。下へ行くほど暗くして文字を読みやすくする */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(rgba(6, 10, 18, 0.15), rgba(6, 10, 18, 0.55) 60%, rgba(6, 10, 18, 0.85)),
    var(--bg) url("bg.jpg") center 70% / cover no-repeat;
}

/* 写真の粒状感（ごく薄く全体に） */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 10;
  pointer-events: none;
  opacity: 0.07;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

a { color: inherit; }

/* ══ 1. ファーストビュー ══ */
.hero {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(32px, 6vw, 88px);
  min-height: 100vh;
  min-height: 100svh;
  padding: 0 16px;
}

/* 見上げた信号機。柱は画面の下の外へ続く */
.signal { align-self: flex-end; flex-shrink: 0; margin-bottom: -2px; }
.signal img {
  display: block;
  height: clamp(520px, calc(100svh - 28px), 1080px);
  width: auto;
  filter: drop-shadow(0 0 30px rgba(0, 0, 0, 0.35));
}

.hero__copy { text-shadow: 0 2px 18px rgba(0, 0, 0, 0.55); padding-bottom: 40px; max-width: 560px; }

.logo { margin: 0; line-height: 1; }
.logo__ja { display: block; font-size: clamp(44px, 9vw, 92px); font-weight: 800; letter-spacing: 0.06em; }
.logo__en {
  display: block;
  margin-top: 14px;
  font-size: clamp(14px, 2.2vw, 18px);
  font-weight: 500;
  letter-spacing: 0.42em;
  color: var(--ink-sub);
  text-transform: uppercase;
}
.catch { margin: 28px 0 0; font-size: clamp(18px, 2.6vw, 24px); font-weight: 600; letter-spacing: 0.12em; }
.hero__lead { margin: 18px 0 0; font-size: clamp(15px, 1.8vw, 17px); line-height: 1.9; color: #dfe6f0; }

/* ボタン */
.cta { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 16px; margin-top: 30px; }
.cta--center { justify-content: center; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 46px;
  padding: 11px 24px;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 8px;
  background: rgba(8, 12, 20, 0.5);
  color: var(--ink);
  font-size: 15px;
  letter-spacing: 0.08em;
  text-decoration: none;
  text-shadow: none;
  transition: border-color 0.2s, background-color 0.2s;
}
.btn::after { content: "→"; color: var(--ink-sub); }
.btn:hover, .btn:focus-visible { background: rgba(8, 12, 20, 0.75); border-color: rgba(255, 255, 255, 0.7); outline: none; }
.btn--primary { border-color: var(--go); background: rgba(62, 224, 143, 0.16); font-weight: 700; }
.btn--primary::after { color: var(--go); }
.btn--primary:hover, .btn--primary:focus-visible { background: rgba(62, 224, 143, 0.28); border-color: var(--go); }
.btn[hidden] { display: none; }

/* 公開予定日 */
.release { margin: 0; font-size: 15px; letter-spacing: 0.06em; color: var(--ink-sub); }
.release time { color: var(--ink); font-weight: 700; }
.release[hidden] { display: none; }

/* 公開の条件（小さな札） */
.tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 22px 0 0; padding: 0; list-style: none; }
.tags li {
  padding: 5px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(8, 12, 20, 0.4);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--ink-sub);
  text-shadow: none;
}
.tags li:first-child { color: var(--ink); border-color: rgba(255, 255, 255, 0.45); }

/* ══ 2〜6. 本文 ══ */
main { max-width: 1120px; margin: 0 auto; padding: 0 16px; }
.sec { padding: clamp(64px, 10vw, 120px) 0 0; scroll-margin-top: 24px; }
.sec--center { text-align: center; }

.eyebrow { margin: 0 0 12px; font-size: 12px; letter-spacing: 0.36em; color: var(--ink-sub); text-transform: uppercase; }
/* 見出しの前の小さな灯り（白い丸） */
.eyebrow::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-right: 10px;
  border-radius: 50%;
  background: #e9eef6;
  box-shadow: 0 0 8px rgba(233, 238, 246, 0.7);
  vertical-align: 1px;
}
.sec-title { margin: 0; font-size: clamp(26px, 4.2vw, 40px); font-weight: 800; letter-spacing: 0.06em; line-height: 1.4; }
.sec-lead { max-width: 42em; margin: 20px 0 0; font-size: clamp(15px, 1.8vw, 16.5px); line-height: 2; color: #dfe6f0; }
.sec--center .sec-lead { margin-left: auto; margin-right: auto; }

/* ゲームの画面：細い枠と影でモニターのように見せる */
.screen {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 10px;
  background: #0b1220;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
}
.screen img { display: block; width: 100%; height: 100%; object-fit: cover; }
.screen figcaption {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 28px 16px 12px;
  background: linear-gradient(transparent, rgba(4, 7, 13, 0.78));
  font-size: 13px;
  letter-spacing: 0.06em;
  color: #e6ecf5;
}
.screen--wide { margin-top: clamp(32px, 5vw, 56px); aspect-ratio: 21 / 9; }

/* 遊び方 3 つ */
.view-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 36px; }
.view .screen { aspect-ratio: 4 / 3; }
.view__title { margin: 18px 0 0; font-size: 22px; letter-spacing: 0.2em; }
.view p { margin: 8px 0 0; font-size: 14.5px; line-height: 1.9; color: var(--ink-body); }

/* 仕組み 3 つ */
.point-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin: 32px 0 0; padding: 0; list-style: none; }
.point { padding: 22px 22px 24px; border: 1px solid var(--line); border-radius: 10px; background: var(--panel); }
.point__no { font-family: ui-monospace, "SFMono-Regular", Consolas, monospace; font-size: 13px; letter-spacing: 0.1em; color: var(--ink-sub); }
.point__title { margin: 10px 0 0; font-size: 19px; letter-spacing: 0.06em; }
.point p { margin: 12px 0 0; font-size: 14px; line-height: 1.9; color: var(--ink-body); }

/* 紹介動画（押すまで YouTube を読み込まない） */
.movie {
  position: relative;
  margin-top: 32px;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 10px;
  background: #070c16;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
}
/* 準備中のあいだは、空の大きな枠を出さない */
.movie--wait { aspect-ratio: auto; min-height: 180px; display: flex; }
.movie--wait .movie__wait { width: 100%; height: auto; }
.movie iframe { display: block; width: 100%; height: 100%; border: 0; }
.movie__wait {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  padding: 16px;
  text-align: center;
  color: var(--ink-sub);
  font-size: 14px;
}
.movie__wait p { margin: 6px 0 0; }
.movie__wait-title { color: var(--ink); font-size: 18px; letter-spacing: 0.1em; }
.movie__start {
  display: block;
  width: 100%;
  height: 100%;
  padding: 0;
  border: 0;
  background: #070c16 center / cover no-repeat;
  cursor: pointer;
}
.movie__play {
  position: absolute;
  left: 50%; top: 50%;
  width: 84px; height: 84px;
  margin: -42px 0 0 -42px;
  border: 2px solid rgba(255, 255, 255, 0.85);
  border-radius: 50%;
  background: rgba(8, 12, 20, 0.6);
  transition: background-color 0.2s;
}
.movie__play::after {
  content: "";
  position: absolute;
  left: 33px; top: 25px;
  border-style: solid;
  border-width: 16px 0 16px 26px;
  border-color: transparent transparent transparent #fff;
}
.movie__start:hover .movie__play, .movie__start:focus-visible .movie__play { background: rgba(62, 224, 143, 0.45); }
.movie__start:focus-visible { outline: 2px solid var(--go); outline-offset: -2px; }

.caution {
  margin: 14px 0 0;
  padding: 10px 14px;
  border-left: 3px solid var(--caution);
  background: rgba(255, 194, 74, 0.08);
  font-size: 14px;
  line-height: 1.8;
  color: #f0e6d0;
}

/* 遊べる環境の案内（遊び方の下） */
.env-note {
  margin: 28px 0 0;
  padding: 12px 16px;
  border-left: 3px solid var(--go);
  background: rgba(62, 224, 143, 0.07);
  font-size: 15px;
  line-height: 1.8;
  color: #dfe6f0;
}
.env-note strong { color: #fff; }

/* 無料プレイの条件 */
.spec {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  max-width: 900px;
  margin: 32px auto 0;
}
.spec div { padding: 16px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--panel); }
.spec dt { font-size: 12px; letter-spacing: 0.12em; color: var(--ink-sub); }
.spec dd { margin: 8px 0 0; font-size: 15.5px; font-weight: 700; line-height: 1.6; word-break: auto-phrase; }
.spec dd small { display: block; margin-top: 2px; font-size: 12px; font-weight: 400; color: var(--ink-sub); }

/* ══ 7. フッター ══ */
.footer {
  max-width: 1120px;
  margin: clamp(72px, 10vw, 120px) auto 0;
  padding: 32px 16px 40px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
}
.footer__logo { margin: 0; font-size: 18px; font-weight: 800; letter-spacing: 0.08em; }
.footer__logo span { margin-left: 8px; font-size: 11px; font-weight: 500; letter-spacing: 0.36em; color: var(--ink-sub); }
.footer__creator { margin: 8px 0 0; font-size: 13px; color: var(--ink-sub); }
.footer__contact { margin: 16px 0 0; font-size: 13px; color: var(--ink-sub); }
.footer__contact a { color: var(--ink); }
.links { display: flex; justify-content: center; flex-wrap: wrap; gap: 10px 14px; margin-top: 20px; }
.links a {
  min-width: 88px;
  padding: 9px 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(8, 12, 20, 0.45);
  color: var(--ink);
  font-size: 14px;
  letter-spacing: 0.06em;
  text-decoration: none;
}
.links a:hover, .links a:focus-visible { border-color: rgba(255, 255, 255, 0.5); outline: none; }
[hidden] { display: none !important; }
.notes { margin: 24px 0 0; font-size: 12px; line-height: 1.9; color: #9eabbf; }
.notes p { margin: 0; }

/* 日本語の文を語句の切れ目で折り返す */
.hero__lead, .sec-lead, .point p, .view p, .caution, .env-note, .release { word-break: auto-phrase; }

.sp { display: none; }

/* ══ スマホ ══ */
@media (max-width: 900px) {
  .spec { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 700px) {
  .sp { display: inline; }
  .hero { flex-direction: column; justify-content: flex-start; padding-top: 20px; gap: 18px; }
  .hero__copy { text-align: center; padding-bottom: 48px; }
  .signal { align-self: center; margin-bottom: 0; }
  .signal img {
    height: min(40svh, 360px);
    -webkit-mask-image: linear-gradient(#000 74%, transparent);
    mask-image: linear-gradient(#000 74%, transparent);
  }
  .catch { margin-top: 20px; }
  .hero__lead br, .sec-lead br { display: none; }
  .cta { justify-content: center; margin-top: 24px; }
  .tags { justify-content: center; }
  .screen--wide { aspect-ratio: 16 / 10; }
  .point-list, .view-list { grid-template-columns: 1fr; }
  .view .screen { aspect-ratio: 16 / 9; }
}