:root {
  --bg: #1b1d23;
  --panel: #23262e;
  --panel-2: #2b2f39;
  --text: #eceff4;
  --muted: #8b93a7;
  --accent: #ff6b6b;
  --accent-2: #4dd4c4;
  --ok: #6bcf7a;
  --bad: #ff6b6b;
  --line: #363b47;
  --radius: 12px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ---- Top bar ---- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1.4rem;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}

.logo {
  margin: 0;
  font-size: 1.35rem;
  letter-spacing: 0.5px;
  cursor: pointer;
  user-select: none;
}
.logo:hover span { color: var(--accent-2); }
.logo span { color: var(--accent); transition: color 0.15s; }

.tabs { display: flex; gap: 0.4rem; }

.tab {
  background: transparent;
  color: var(--muted);
  border: 1px solid transparent;
  padding: 0.5rem 0.9rem;
  border-radius: 999px;
  font-size: 0.95rem;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.tab:hover { color: var(--text); background: var(--panel-2); }
.tab.is-active { color: var(--text); background: var(--panel-2); }
.tab--study { color: var(--bg); background: var(--accent-2); font-weight: 600; }
.tab--study:hover { background: #66e0d0; color: var(--bg); }
.tab--study.is-active { background: #66e0d0; color: var(--bg); }

/* ---- Views ---- */
main { width: 100%; max-width: 900px; margin: 0 auto; padding: 1.5rem 1.2rem 4rem; flex: 1 0 auto; }
.view { display: none; }
.view.is-active { display: block; }

/* ---- Home / landing ---- */
.home {
  position: relative;
  text-align: center;
  padding: 3rem 1rem 4rem;
  overflow: hidden;
}
.home-kana {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  place-items: center;
  gap: 2rem;
  font-size: clamp(3rem, 12vw, 6rem);
  color: var(--text);
  opacity: 0.04;
  pointer-events: none;
  z-index: 0;
}
.home > :not(.home-kana) { position: relative; z-index: 1; }

.home-title {
  font-size: clamp(2.6rem, 9vw, 4.2rem);
  margin: 0.2rem 0 0;
  letter-spacing: 0.5px;
}
.home-title span { color: var(--accent); }
.home-tagline {
  font-size: clamp(1.1rem, 3.5vw, 1.5rem);
  color: var(--accent-2);
  margin: 0.4rem 0 2rem;
}
.home-lead {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 1.6rem 0 0.6rem;
}
.home-step {
  font-size: 1.05rem;
  color: var(--muted);
  line-height: 2.1;
  max-width: 560px;
  margin: 0.3rem auto;
}

.pill {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--line);
  padding: 0.3rem 0.8rem;
  border-radius: 999px;
  font-size: 0.95rem;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.pill:hover { border-color: var(--accent-2); background: var(--bg); }
.pill--study { background: var(--accent-2); color: var(--bg); border-color: var(--accent-2); font-weight: 600; }
.pill--study:hover { background: #66e0d0; color: var(--bg); }

.home-cta {
  margin-top: 2.4rem;
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 0.8rem 1.8rem;
  border-radius: 999px;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.1s, background 0.15s;
}
.home-cta:hover { background: #ff8080; transform: translateY(-2px); }

/* ---- Selection ---- */
.select-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.4rem;
}
.select-title { font-size: 1.2rem; font-weight: 600; }
.select-actions { display: flex; gap: 0.5rem; }

.ghost {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--line);
  padding: 0.45rem 0.8rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.9rem;
}
.ghost:hover { background: var(--panel-2); }

.hint { color: var(--muted); font-size: 0.9rem; margin: 0.2rem 0 1.2rem; }

.grid { display: flex; flex-direction: column; gap: 1.4rem; align-items: center; }

.group { display: flex; flex-direction: column; align-items: center; }
.group-title {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--muted);
  margin: 0 0 0.5rem;
}

.row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  padding: 0.35rem;
  width: fit-content;
  max-width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
  background: var(--panel);
  margin-bottom: 0.5rem;
}
.row:hover { border-color: var(--accent-2); }
.row.on { background: var(--panel-2); border-color: var(--accent-2); }

.cell {
  width: 66px;
  height: 66px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  background: transparent;
  opacity: 0.4;
  transition: opacity 0.15s;
}
.row.on .cell { opacity: 1; }
.cell .kana { font-size: 1.5rem; line-height: 1; }
.cell .romaji { font-size: 0.7rem; color: var(--muted); margin-top: 3px; }
.cell.empty { visibility: hidden; }

/* Kanji selection cells are wider to fit an English gloss. */
.row--kanji .cell { width: 78px; height: 66px; }
.row--kanji .cell .romaji {
  font-size: 0.58rem;
  line-height: 1.15;
  text-align: center;
  padding: 0 2px;
}

/* ---- Kanji level picker ---- */
.level-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  padding: 1rem 0;
}
.level-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  width: 180px;
  padding: 1.6rem 1rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, transform 0.1s;
}
.level-card:hover {
  border-color: var(--accent-2);
  background: var(--panel-2);
  transform: translateY(-2px);
}
.level-name { font-size: 1.8rem; font-weight: 700; color: var(--accent-2); }
.level-desc { font-size: 0.85rem; color: var(--muted); text-align: center; }
.level-count { font-size: 0.75rem; color: var(--muted); }

.kanji-back { margin-bottom: 1rem; }

/* ---- Study ---- */
.study-empty { text-align: center; color: var(--muted); padding: 4rem 1rem; }

.stats {
  display: flex;
  justify-content: center;
  gap: 2.5rem;
  margin: 0.5rem 0 2rem;
}
.stat { text-align: center; }
.stat span { font-size: 1.6rem; font-weight: 700; display: block; }
.stat label { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 1px; color: var(--muted); }

.card {
  margin: 0 auto 1.5rem;
  width: min(320px, 80vw);
  height: min(320px, 80vw);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 20px;
  transition: background 0.2s, border-color 0.2s;
}
.card.correct { border-color: var(--ok); background: rgba(107, 207, 122, 0.12); }
.card.wrong { border-color: var(--bad); background: rgba(255, 107, 107, 0.12); }
.prompt { font-size: clamp(5rem, 22vw, 9rem); line-height: 1; }
/* Reverse mode shows a reading/meaning word, so shrink the prompt to fit. */
.card--text .prompt { font-size: clamp(1.4rem, 6vw, 2.6rem); padding: 0 1rem; text-align: center; }

/* ---- Study options ---- */
.study-options {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.8rem;
  margin: 0 0 1.5rem;
}
.seg { display: flex; align-items: center; gap: 0.3rem; }
.seg[hidden] { display: none; }
.seg-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--muted);
  margin-right: 0.2rem;
}
.seg-btn {
  background: var(--panel);
  color: var(--muted);
  border: 1px solid var(--line);
  padding: 0.4rem 0.8rem;
  font-size: 0.85rem;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.seg-btn:first-of-type { border-radius: 999px 0 0 999px; }
.seg-btn:last-of-type { border-radius: 0 999px 999px 0; margin-left: -1px; }
.seg-btn:hover { color: var(--text); }
.seg-btn.is-active {
  color: var(--bg);
  background: var(--accent-2);
  border-color: var(--accent-2);
  font-weight: 600;
}
.seg-tag {
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  opacity: 0.7;
}

/* ---- Multiple-choice answers ---- */
.choices {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
  width: min(360px, 90vw);
  margin: 0 auto 1rem;
}
.choice {
  padding: 1rem;
  font-size: 2rem;
  background: var(--panel);
  color: var(--text);
  border: 2px solid var(--line);
  border-radius: 12px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, transform 0.1s;
}
.choice:hover:not(:disabled) { border-color: var(--accent-2); transform: translateY(-2px); }
.choice:disabled { cursor: default; }
.choice.is-correct { border-color: var(--ok); background: rgba(107, 207, 122, 0.15); }
.choice.is-wrong { border-color: var(--bad); background: rgba(255, 107, 107, 0.15); }

#btn-hint:not([hidden]) { display: block; margin: 0.9rem auto 0; }

#answer-form, #anime-form { text-align: center; }
#answer, #anime-answer {
  font-size: 1.5rem;
  text-align: center;
  padding: 0.6rem 1rem;
  width: min(280px, 80vw);
  background: var(--panel);
  color: var(--text);
  border: 2px solid var(--line);
  border-radius: 10px;
  outline: none;
}
#anime-answer { font-size: 1.1rem; width: min(380px, 88vw); }
#answer:focus, #anime-answer:focus { border-color: var(--accent-2); }

/* ---- Ani-Names game ---- */
.anime-tip { text-align: center; margin-top: 0; }
.card--anime {
  height: auto;
  min-height: 0;
  width: min(440px, 92vw);
  padding: 1rem 1.2rem;
}
.card--anime .prompt { word-break: break-word; }
.anime-actions {
  display: flex;
  justify-content: center;
  gap: 0.6rem;
  margin-top: 0.9rem;
}
.anime-actions #anime-hint:not([hidden]) { margin: 0; display: inline-block; }
.anime-cover {
  display: flex;
  justify-content: center;
  margin: 0.9rem 0 0.2rem;
}
.anime-cover img {
  width: min(200px, 55vw);
  border-radius: 12px;
  border: 1px solid var(--line);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.35);
}

.feedback {
  text-align: center;
  min-height: 1.4rem;
  margin: 1rem 0 0;
  font-size: 1rem;
}
.feedback.ok { color: var(--ok); }
.feedback.bad { color: var(--bad); }
.feedback.meaning {
  color: var(--accent-2);
  font-style: italic;
  font-size: 1.2rem;
  letter-spacing: 0.3px;
}
.feedback .mark { font-size: 1.3rem; font-weight: 700; }

/* ---- Content pages (About / Notes) ---- */
.page { max-width: 640px; margin: 0 auto; padding: 1rem 0 2rem; }
.page-title { font-size: 1.6rem; margin: 0 0 1rem; }
.muted { color: var(--muted); }

.prose { line-height: 1.7; color: var(--text); }
.prose p { margin: 0 0 1rem; }
.prose .pill { line-height: 1.4; }

.about { display: flex; flex-wrap: wrap; gap: 1.5rem; align-items: flex-start; }
.about-photo {
  flex: 0 0 auto;
  width: 160px;
  height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: var(--panel-2);
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  color: var(--muted);
  font-size: 0.85rem;
}
.about .prose { flex: 1 1 260px; }

.notes-sub {
  text-transform: uppercase;
  letter-spacing: 1px;
  font-size: 0.75rem;
  margin: -0.4rem 0 1.2rem;
}
.notes-list { display: flex; flex-direction: column; gap: 0.2rem; }
.note-link {
  text-align: left;
  background: transparent;
  color: var(--accent-2);
  border: none;
  border-bottom: 1px solid var(--line);
  padding: 0.75rem 0.2rem;
  font-size: 1.05rem;
  cursor: pointer;
  transition: color 0.15s, padding-left 0.15s;
}
.note-link:hover { color: var(--text); padding-left: 0.5rem; }
.notes-back { margin-bottom: 1.2rem; }
.note-article .page-title { margin-top: 0; }

/* ---- Footer ---- */
.sitefoot {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.4rem;
  padding: 0.9rem 1.4rem;
  background: var(--panel);
  border-top: 1px solid var(--line);
  flex-shrink: 0;
}
.foot-link {
  background: transparent;
  color: var(--muted);
  border: 1px solid transparent;
  padding: 0.5rem 0.9rem;
  border-radius: 999px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.foot-link:hover {
  color: var(--text);
  background: var(--panel-2);
  border-color: var(--accent-2);
}