/* Focus Immersion — Kana sound grid. Page-scoped; relies on shared tokens in /styles.css. */

.kana-page { max-width: 980px; margin: 0 auto; padding: clamp(2.5rem, 5vw, 4rem) clamp(1rem, 4vw, 3rem) 5rem; }

.kana-hero { padding: clamp(2.5rem, 7vw, 5rem) 0 clamp(1.2rem, 3vw, 2rem); }
.kana-hero .study-title { margin: 0.3rem 0 1rem; }
.kana-lede { max-width: 44rem; color: var(--cream); opacity: 0.86; font-size: 1.05rem; line-height: 1.62; }
.kana-lede strong { color: var(--gold); font-weight: 500; }
.kana-note { margin-top: 0.85rem; max-width: 44rem; font-size: 0.83rem; color: var(--cream); opacity: 0.5; line-height: 1.55; }

/* ---------- controls ---------- */
.kana-controls { position: sticky; top: 0; z-index: 30; display: flex; flex-wrap: wrap; gap: 0.7rem 1.1rem; align-items: center;
  margin: 0 0 1.8rem; padding: 0.85rem 0 0.8rem; background: linear-gradient(180deg, var(--ink) 74%, rgba(11,10,8,0)); }
.seg { display: inline-flex; border: 1px solid rgba(236,227,211,0.16); border-radius: 3px; overflow: hidden; }
.seg button { background: transparent; border: none; color: var(--cream); opacity: 0.6; font: inherit; font-size: 0.8rem;
  letter-spacing: 0.02em; padding: 0.4rem 0.8rem; cursor: pointer; transition: background 0.15s, opacity 0.15s; }
.seg button + button { border-left: 1px solid rgba(236,227,211,0.12); }
.seg button.is-on { background: rgba(196,163,92,0.16); color: var(--cream); opacity: 1; }
.seg button:hover { opacity: 1; }
.kana-toggle { display: inline-flex; align-items: center; gap: 0.45rem; font-size: 0.78rem; color: var(--cream); opacity: 0.7; cursor: pointer; user-select: none; }
.kana-toggle input { accent-color: var(--gold); }
.kana-search { flex: 1; min-width: 12rem; max-width: 22rem; background: rgba(236,227,211,0.05); border: 1px solid rgba(236,227,211,0.16);
  border-radius: 2px; color: var(--cream); font: inherit; font-size: 0.9rem; padding: 0.45rem 0.7rem; }
.kana-search::placeholder { color: rgba(236,227,211,0.4); }
.kana-search:focus { outline: none; border-color: var(--gold); }

/* ---------- sections ---------- */
.kana-block { margin-bottom: 2.6rem; }
.kana-block h2 { font-family: var(--ff-disp, "Fraunces", Georgia, serif); font-weight: 400; font-size: 1.55rem; color: var(--cream); margin: 0 0 0.25rem; }
.kana-block .sub { font-size: 0.82rem; color: var(--cream); opacity: 0.5; margin: 0 0 1rem; }

/* gojūon / dakuten grid: row-label + 5 vowel columns */
.kana-grid { display: grid; grid-template-columns: 2.5rem repeat(5, 1fr); gap: 0.3rem; }
.kana-grid.cols-3 { grid-template-columns: 2.5rem repeat(3, 1fr); }
.kana-vowel-head, .kana-row-label { display: flex; align-items: center; justify-content: center; font-family: var(--ff-mono, "DM Mono", monospace);
  font-size: 0.72rem; color: var(--gold); opacity: 0.85; text-transform: lowercase; }
.kana-row-label { letter-spacing: 0.02em; }
.kana-vowel-head { padding-bottom: 0.1rem; cursor: pointer; }
.kana-row-label { cursor: pointer; }
.kana-vowel-head.hot, .kana-row-label.hot { color: var(--accent-hi, #a8c0b0); opacity: 1; }

.kana-cell { position: relative; aspect-ratio: 1 / 1; display: flex; flex-direction: column; align-items: center; justify-content: center;
  border: 1px solid rgba(236,227,211,0.1); border-radius: 3px; background: rgba(236,227,211,0.025); cursor: pointer;
  transition: transform 0.12s, border-color 0.15s, background 0.15s; }
.kana-cell.empty { background: transparent; border-color: transparent; cursor: default; }
.kana-cell:hover, .kana-cell:focus-visible { transform: translateY(-2px); border-color: var(--gold); outline: none; background: rgba(196,163,92,0.07); }
.kana-cell .glyph { font-family: "Noto Serif JP", var(--ff-disp), serif; color: var(--cream); line-height: 1.05; }
.kana-cell .glyph.lg { font-size: clamp(1.3rem, 3.4vw, 1.7rem); }
.kana-cell .glyph.sm { font-size: 0.92rem; opacity: 0.62; }
.kana-cell .romaji { margin-top: 0.18rem; font-family: var(--ff-mono, monospace); font-size: 0.62rem; color: var(--cream); opacity: 0.5; letter-spacing: 0.02em; }
.kana-cell.dim { opacity: 0.16; }
.kana-cell.lit { border-color: var(--accent-hi, #a8c0b0); background: rgba(143,168,154,0.1); }
.kana-cell.is-hit { border-color: var(--gold); box-shadow: 0 0 0 1px var(--gold); }
.kana-both .glyph.lg { font-size: clamp(1.05rem, 2.8vw, 1.35rem); }

.kana-n-wrap { margin-top: 0.9rem; display: flex; gap: 0.3rem; }
.kana-n-wrap .kana-cell { max-width: calc((100% - 2.5rem - 1.5rem) / 5); }

/* ---------- detail drawer (shared pattern with kanji) ---------- */
.kana-drawer { position: fixed; top: 0; right: 0; z-index: 60; width: min(360px, 92vw); height: 100%;
  background: var(--surface, rgba(16,14,12,0.97)); backdrop-filter: blur(8px); border-left: 1px solid rgba(236,227,211,0.14);
  box-shadow: -24px 0 60px rgba(0,0,0,0.5); transform: translateX(100%); transition: transform 0.32s cubic-bezier(0.22,1,0.36,1);
  overflow-y: auto; padding: 1.6rem; }
.kana-drawer.is-open { transform: translateX(0); }
.kana-drawer-close { position: absolute; top: 1rem; right: 1.1rem; background: none; border: none; color: var(--cream); opacity: 0.55; font-size: 1.35rem; cursor: pointer; }
.kana-drawer-close:hover { opacity: 1; }
.kana-d-glyphs { display: flex; gap: 1.4rem; align-items: baseline; margin: 0.4rem 0 0.3rem; }
.kana-d-glyphs .big { font-family: "Noto Serif JP", serif; font-size: 4.4rem; line-height: 1; color: var(--cream); }
.kana-d-glyphs .pair { font-family: var(--ff-mono, monospace); font-size: 0.66rem; color: var(--cream); opacity: 0.45; text-transform: uppercase; letter-spacing: 0.08em; }
.kana-d-romaji { font-family: var(--ff-disp, serif); font-style: italic; font-size: 1.5rem; color: var(--gold); margin-bottom: 1.1rem; }
.kana-audio { margin: -0.4rem 0 1rem; }
.kana-audio-btn { background: rgba(196,163,92,0.12); border: 1px solid rgba(196,163,92,0.45); color: var(--cream);
  font-family: var(--ff-mono, monospace); font-size: 0.74rem; letter-spacing: 0.03em; padding: 0.42rem 0.85rem; border-radius: 4px; cursor: pointer; transition: border-color 0.15s, background 0.15s; }
.kana-audio-btn:hover { border-color: var(--gold); background: rgba(196,163,92,0.2); }
.kana-d-rows { display: grid; gap: 0.05rem; }
.kana-d-row { display: grid; grid-template-columns: 5.6rem 1fr; gap: 0.6rem; padding: 0.55rem 0; border-top: 1px solid rgba(236,227,211,0.08); }
.kana-d-row:first-child { border-top: none; }
.kana-d-k { font-family: var(--ff-mono, monospace); font-size: 0.66rem; text-transform: uppercase; letter-spacing: 0.07em; color: var(--cream); opacity: 0.45; padding-top: 0.12rem; }
.kana-d-v { color: var(--cream); font-size: 0.95rem; line-height: 1.5; }
.kana-d-v.jp { font-family: "Noto Serif JP", serif; }
.kana-backdrop { position: fixed; inset: 0; z-index: 55; background: rgba(5,4,3,0.45); opacity: 0; pointer-events: none; transition: opacity 0.3s; }
.kana-backdrop.is-open { opacity: 1; pointer-events: auto; }

@media (max-width: 600px) {
  .kana-cell .glyph.lg { font-size: 1.4rem; }
  .kana-drawer { width: 100%; height: auto; max-height: 84vh; top: auto; bottom: 0; border-left: none; border-top: 1px solid rgba(236,227,211,0.14);
    transform: translateY(100%); border-radius: 10px 10px 0 0; }
  .kana-drawer.is-open { transform: translateY(0); }
}