:root {
  --ink: #120c0a;
  --ink-2: #1c1410;
  --paper: #f3ead6;
  --paper-2: #e7d9b8;
  --vermillion: #c23a2b;
  --vermillion-dark: #8e2418;
  --gold: #d4a84b;
  --gold-2: #f0d48a;
  --sakura: #e8a0b0;
  --bamboo: #3d6b4a;
  --navy: #24344f;
  --muted: #8a7b6a;
  --ok: #3d8b5a;
  --bad: #c23a2b;
  --shadow: 0 18px 50px rgba(10, 6, 4, 0.45);
  --radius: 22px;
  --font-ui: "Zen Kaku Gothic New", "Segoe UI", sans-serif;
  --font-jp: "Shippori Mincho", "Noto Serif JP", serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: var(--font-ui);
  color: var(--paper);
  background:
    radial-gradient(circle at 12% -10%, rgba(194, 58, 43, 0.22), transparent 42%),
    radial-gradient(circle at 90% 0%, rgba(212, 168, 75, 0.12), transparent 36%),
    linear-gradient(180deg, #1a100e 0%, var(--ink) 40%, #0c0807 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.07;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='72' height='62'><path fill='none' stroke='%23f3ead6' stroke-width='1.2' d='M36 2 L70 31 L36 60 L2 31 Z M36 2 L36 60 M2 31 L70 31'/></svg>");
  background-size: 72px 62px;
}

#app { min-height: 100vh; display: flex; flex-direction: column; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 22px 8px;
  position: sticky;
  top: 0;
  z-index: 20;
  background: linear-gradient(180deg, rgba(18, 12, 10, 0.96), rgba(18, 12, 10, 0.78) 70%, transparent);
  backdrop-filter: blur(8px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--paper);
  text-decoration: none;
}
.brand-mark {
  width: 46px;
  height: 46px;
  border-radius: 14px;
  background: linear-gradient(160deg, var(--vermillion), var(--vermillion-dark));
  display: grid;
  place-items: center;
  font-family: var(--font-jp);
  font-size: 1.35rem;
  box-shadow: 0 8px 20px rgba(194, 58, 43, 0.35);
}
.brand h1 {
  margin: 0;
  font-size: 1.05rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.brand p {
  margin: 0;
  color: var(--gold-2);
  font-family: var(--font-jp);
  font-size: 0.95rem;
}

.stats {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}
.pill {
  background: rgba(243, 234, 214, 0.08);
  border: 1px solid rgba(243, 234, 214, 0.12);
  border-radius: 999px;
  padding: 7px 12px;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--gold-2);
}

.nav {
  display: flex;
  gap: 8px;
  padding: 0 22px 12px;
  overflow-x: auto;
}
.nav a {
  color: var(--paper-2);
  text-decoration: none;
  padding: 10px 14px;
  border-radius: 14px;
  font-weight: 700;
  white-space: nowrap;
  border: 1px solid transparent;
}
.nav a.is-on, .nav a:hover {
  background: rgba(194, 58, 43, 0.18);
  border-color: rgba(194, 58, 43, 0.4);
  color: white;
}

main {
  flex: 1;
  padding: 8px 22px 40px;
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
}

.hero {
  display: grid;
  grid-template-columns: 1.3fr 0.9fr;
  gap: 22px;
  align-items: stretch;
  margin-bottom: 22px;
}
.card {
  background: linear-gradient(180deg, rgba(243, 234, 214, 0.08), rgba(243, 234, 214, 0.03));
  border: 1px solid rgba(243, 234, 214, 0.12);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
}
.hero-copy h2 {
  font-family: var(--font-jp);
  font-size: clamp(2rem, 5vw, 3.4rem);
  margin: 0 0 8px;
  line-height: 1.1;
}
.kicker {
  color: var(--sakura);
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-size: 0.75rem;
  margin: 0 0 8px;
}
.muted { color: var(--muted); }
.hero-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 18px; }

.btn, button.btn {
  appearance: none;
  border: 0;
  cursor: pointer;
  font-family: inherit;
  font-weight: 800;
  border-radius: 14px;
  padding: 12px 16px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-primary { background: var(--vermillion); color: white; }
.btn-gold { background: var(--gold); color: #1a1008; }
.btn-ghost {
  background: transparent;
  color: var(--paper);
  border: 1px solid rgba(243, 234, 214, 0.22);
}

.path-grid, .deck-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}
.path-card, .deck-card {
  text-align: left;
  background: rgba(243, 234, 214, 0.06);
  border: 1px solid rgba(243, 234, 214, 0.12);
  border-radius: 18px;
  padding: 18px;
  color: inherit;
  cursor: pointer;
  width: 100%;
  font-family: inherit;
}
.path-card:hover, .deck-card:hover { border-color: var(--gold); transform: translateY(-2px); }
.path-card .jp, .deck-card .jp {
  font-family: var(--font-jp);
  font-size: 1.6rem;
  display: block;
  margin-bottom: 4px;
}
.progress-mini {
  height: 8px;
  background: rgba(255,255,255,0.08);
  border-radius: 99px;
  overflow: hidden;
  margin-top: 12px;
}
.progress-mini span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--vermillion), var(--gold));
}

.toolbar {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 16px;
}
.tabs { display: flex; gap: 8px; flex-wrap: wrap; }
.tab {
  background: rgba(243, 234, 214, 0.06);
  color: var(--paper);
  border: 1px solid rgba(243, 234, 214, 0.12);
}

.kana-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(84px, 1fr));
  gap: 8px;
}
.kana-cell {
  background: rgba(243, 234, 214, 0.07);
  border: 1px solid rgba(243, 234, 214, 0.1);
  border-radius: 16px;
  min-height: 92px;
  cursor: pointer;
  color: var(--paper);
  font-family: inherit;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
}
.kana-cell .glyph {
  font-family: var(--font-jp);
  font-size: 1.8rem;
  line-height: 1;
}
.kana-cell .roma { font-size: 0.75rem; color: var(--gold-2); font-weight: 700; }
.kana-cell.is-mastered { box-shadow: inset 0 0 0 2px var(--bamboo); }
.kana-cell.is-learning { box-shadow: inset 0 0 0 2px var(--gold); }
.kana-cell.is-on { background: rgba(194, 58, 43, 0.28); }

.practice {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 18px;
}
.prompt-board {
  min-height: 320px;
  display: grid;
  place-items: center;
  text-align: center;
}
.prompt-glyph {
  font-family: var(--font-jp);
  font-size: clamp(4.5rem, 12vw, 8rem);
  line-height: 1;
  margin: 0;
}
.choices {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.choice {
  min-height: 72px;
  font-size: 1.15rem;
  background: rgba(243, 234, 214, 0.08);
  color: var(--paper);
  border: 1px solid rgba(243, 234, 214, 0.14);
}
.choice.is-ok { background: var(--ok); color: white; }
.choice.is-bad { background: var(--bad); color: white; }
.feedback {
  min-height: 28px;
  margin: 12px 0 0;
  font-weight: 700;
}
.feedback.ok { color: #8ee0a8; }
.feedback.bad { color: #ffb4ab; }

.type-row {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}
.type-row input {
  flex: 1;
  border-radius: 14px;
  border: 1px solid rgba(243, 234, 214, 0.2);
  background: rgba(0,0,0,0.25);
  color: white;
  padding: 12px 14px;
  font-size: 1rem;
  font-family: inherit;
}

.detail {
  display: flex;
  align-items: center;
  gap: 16px;
}
.detail .big {
  font-family: var(--font-jp);
  font-size: 4rem;
  margin: 0;
  line-height: 1;
}

.welcome {
  position: fixed;
  inset: 0;
  background: rgba(8, 5, 4, 0.72);
  display: grid;
  place-items: center;
  z-index: 40;
  padding: 20px;
}
.welcome .card { max-width: 420px; width: 100%; color: var(--paper); }
.welcome input {
  width: 100%;
  margin: 12px 0 16px;
  border-radius: 14px;
  border: 1px solid rgba(243, 234, 214, 0.2);
  background: rgba(0,0,0,0.28);
  color: white;
  padding: 12px 14px;
  font-size: 1rem;
  font-family: inherit;
}

.result-score {
  font-family: var(--font-jp);
  font-size: 3.4rem;
  margin: 8px 0;
}

@media (max-width: 820px) {
  .hero, .practice { grid-template-columns: 1fr; }
  .topbar { flex-direction: column; align-items: flex-start; }
  .stats { justify-content: flex-start; }
  main, .nav { padding-left: 14px; padding-right: 14px; }
}