:root {
  --bg: #100b10;
  --surface: #1b121a;
  --surface-2: #281824;
  --text: #f7f0e9;
  --muted: #cbbfc3;
  --accent: #d6473d;
  --accent-2: #e4b45e;
  --border: rgba(255,255,255,.12);
  --shadow: 0 18px 50px rgba(0,0,0,.35);
  --radius: 20px;
  --font-scale: 1;
}

* { box-sizing: border-box; }
html { background: var(--bg); color-scheme: dark; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(circle at 20% 0%, rgba(196,48,39,.18), transparent 38%),
    radial-gradient(circle at 90% 20%, rgba(227,177,78,.08), transparent 28%),
    linear-gradient(180deg, #160d14 0%, #0d090d 100%);
  font-family: "Yu Mincho", "Hiragino Mincho ProN", "Noto Serif JP", serif;
  font-size: calc(16px * var(--font-scale));
  line-height: 1.85;
}

button, input, select { font: inherit; }
button { color: inherit; }

.app-shell { min-height: 100vh; padding-bottom: 88px; }
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: 44px 1fr 44px;
  align-items: center;
  gap: 10px;
  min-height: 68px;
  padding: max(8px, env(safe-area-inset-top)) 14px 8px;
  border-bottom: 1px solid var(--border);
  background: rgba(16,11,16,.88);
  backdrop-filter: blur(16px);
}
.topbar-title { min-width: 0; text-align: center; }
.topbar-title strong { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.eyebrow { display: block; color: var(--accent-2); font-size: .72rem; letter-spacing: .12em; }
.icon-button {
  width: 42px;
  height: 42px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255,255,255,.04);
  cursor: pointer;
}

main { width: min(760px, 100%); margin: 0 auto; padding: 18px 16px 36px; }
.hero {
  position: relative;
  overflow: hidden;
  min-height: 430px;
  display: flex;
  align-items: flex-end;
  padding: 34px 24px;
  border: 1px solid var(--border);
  border-radius: 28px;
  background:
    linear-gradient(180deg, rgba(8,5,8,.05), rgba(8,5,8,.88)),
    url("assets/hero.svg") center/cover no-repeat;
  box-shadow: var(--shadow);
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(179,34,32,.12), transparent 42%);
  pointer-events: none;
}
.hero-content { position: relative; z-index: 1; }
.hero h1 { margin: .2em 0; font-size: clamp(2.1rem, 10vw, 4.8rem); line-height: 1.1; letter-spacing: .04em; }
.hero p { max-width: 34em; color: #eee3df; }
.kicker { color: var(--accent-2); letter-spacing: .16em; text-transform: uppercase; font-size: .78rem; }

.card {
  margin: 16px 0;
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(43,25,39,.95), rgba(26,17,25,.95));
  box-shadow: 0 10px 30px rgba(0,0,0,.18);
}
.card h2, .card h3 { margin-top: 0; }
.story-text { white-space: pre-line; }
.muted { color: var(--muted); }
.small-note { color: var(--muted); font-size: .82rem; }
.warning {
  padding: 14px 16px;
  border-left: 4px solid var(--accent-2);
  border-radius: 12px;
  background: rgba(228,180,94,.08);
}

.primary-button, .secondary-button, .danger-button, .choice-button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  width: 100%;
  min-height: 52px;
  margin-top: 10px;
  padding: 12px 18px;
  border-radius: 14px;
  cursor: pointer;
}
.primary-button { border: 0; background: linear-gradient(135deg, #b83231, #d85843); box-shadow: 0 8px 24px rgba(193,56,45,.25); }
.secondary-button { border: 1px solid var(--border); background: rgba(255,255,255,.05); }
.danger-button { border: 1px solid rgba(255,100,100,.35); background: rgba(150,20,20,.2); }
.choice-button { justify-content: flex-start; text-align: left; border: 1px solid var(--border); background: rgba(255,255,255,.04); }
.choice-button:hover, .choice-button:focus-visible { border-color: var(--accent-2); background: rgba(228,180,94,.08); }
.button-row { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }

.progress-wrap { margin: 18px 0; }
.progress-track { height: 9px; overflow: hidden; border-radius: 999px; background: rgba(255,255,255,.08); }
.progress-bar { height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--accent), var(--accent-2)); transition: width .35s ease; }

.chapter-list { display: grid; gap: 12px; }
.chapter-card {
  display: grid;
  grid-template-columns: 42px 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: rgba(255,255,255,.035);
}
.chapter-card.locked { opacity: .5; }
.chapter-card.done { border-color: rgba(228,180,94,.35); }
.chapter-number { display: grid; place-items: center; width: 42px; height: 42px; border-radius: 50%; background: rgba(214,71,61,.16); color: var(--accent-2); font-weight: bold; }
.chapter-card h3 { margin: 0; font-size: 1rem; }
.chapter-card p { margin: 3px 0 0; color: var(--muted); font-size: .82rem; }
.status-mark { font-size: 1.2rem; }

.location-panel { text-align: center; }
.location-icon { font-size: 3rem; }
.answer-input {
  width: 100%;
  min-height: 52px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text);
  background: rgba(0,0,0,.22);
}

.item-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; }
.item {
  aspect-ratio: 3/4;
  display: grid;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(255,255,255,.035);
  font-size: clamp(1.5rem, 8vw, 2.6rem);
}
.item.missing { color: rgba(255,255,255,.16); }
.item.found { color: var(--accent-2); box-shadow: inset 0 0 22px rgba(228,180,94,.08); }

.quote {
  margin: 18px 0;
  padding: 20px;
  border-left: 3px solid var(--accent);
  background: rgba(0,0,0,.18);
  color: #f5e8e2;
}

.bottom-nav {
  position: fixed;
  left: 50%;
  bottom: max(12px, env(safe-area-inset-bottom));
  z-index: 20;
  transform: translateX(-50%);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  width: min(520px, calc(100% - 24px));
  padding: 7px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: rgba(23,14,22,.92);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}
.bottom-nav button { min-height: 48px; border: 0; border-radius: 14px; background: transparent; cursor: pointer; color: var(--muted); }
.bottom-nav button.active { color: var(--text); background: rgba(214,71,61,.16); }

.dialog { width: min(500px, calc(100% - 24px)); border: 0; padding: 0; color: var(--text); background: transparent; }
.dialog::backdrop { background: rgba(0,0,0,.68); backdrop-filter: blur(4px); }
.dialog-card { padding: 22px; border: 1px solid var(--border); border-radius: 22px; background: var(--surface); box-shadow: var(--shadow); }
.dialog-header { display: flex; align-items: center; justify-content: space-between; }
.setting-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--border); }
.setting-row select { max-width: 50%; padding: 8px; border: 1px solid var(--border); border-radius: 10px; color: var(--text); background: var(--surface-2); }

.toast { position: fixed; left: 50%; top: 82px; z-index: 50; transform: translate(-50%, -20px); max-width: calc(100% - 32px); padding: 10px 16px; border-radius: 999px; background: #f3e8de; color: #281515; opacity: 0; pointer-events: none; transition: .25s; box-shadow: var(--shadow); }
.toast.show { opacity: 1; transform: translate(-50%, 0); }

.certificate {
  position: relative;
  overflow: hidden;
  padding: 32px 20px;
  border: 2px solid var(--accent-2);
  border-radius: 8px;
  text-align: center;
  background: #eee2cf;
  color: #2c1718;
}
.certificate::before { content: "記"; position: absolute; right: -5px; bottom: -75px; font-size: 14rem; color: rgba(110,20,22,.07); }
.certificate h2 { font-size: 2rem; }
.certificate .seal { display: inline-grid; place-items: center; width: 76px; height: 76px; margin: 12px; border: 3px double #8d2324; border-radius: 50%; color: #8d2324; font-weight: bold; transform: rotate(-8deg); }

@media (max-width: 520px) {
  .hero { min-height: 60vh; padding: 26px 20px; }
  .button-row { grid-template-columns: 1fr; }
  .card { padding: 18px; }
}