/* ============================================================
   layout.css — top bar, tabs, page layout, sidebar, mobile nav
   ============================================================ */

/* ---------- Top bar ---------- */
header.topbar{
  position:sticky; top:0; z-index:50;
  display:flex; align-items:center; gap:16px; flex-wrap:wrap;
  padding:10px clamp(14px,3vw,34px);
  padding-top:max(10px, env(safe-area-inset-top));
  padding-left:max(clamp(14px,3vw,34px), env(safe-area-inset-left));
  padding-right:max(clamp(14px,3vw,34px), env(safe-area-inset-right));
  background:color-mix(in srgb,var(--paper) 88%,transparent);
  backdrop-filter:blur(10px); -webkit-backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.brand{display:flex;align-items:center;gap:12px;flex:0 0 auto}
.brand .mark{
  font-family:var(--font-jp); font-weight:600; font-size:23px; color:var(--accent);
  border:2px solid var(--accent); border-radius:9px; padding:2px 9px 4px;
  line-height:1; letter-spacing:.04em; box-shadow:inset 0 0 0 2px var(--paper);
}
.brand .titles b{font-family:var(--font-display);font-weight:600;font-size:18px;letter-spacing:-.01em;display:block;line-height:1.1}
.brand .titles span{font-size:11.5px;letter-spacing:.18em;text-transform:uppercase;color:var(--ink-faint)}

/* ---------- View tabs ---------- */
.tabs{display:flex;align-items:center;gap:4px;flex:0 1 auto;overflow-x:auto;scrollbar-width:none;-webkit-overflow-scrolling:touch}
.tabs::-webkit-scrollbar{display:none}
.tab{
  position:relative; font-family:var(--font-ui); font-size:13.5px; font-weight:600;
  color:var(--ink-soft); background:none; border:1px solid transparent; cursor:pointer;
  border-radius:999px; padding:7px 14px; white-space:nowrap; display:inline-flex; align-items:center; gap:7px;
  transition:color .18s,background .18s,border-color .18s;
}
.tab .jp-mini{font-family:var(--font-jp);font-size:11px;opacity:.7}
.tab:hover{color:var(--accent)}
.tab.active{color:#fff;background:var(--accent);border-color:var(--accent)}
.tab.active .jp-mini{opacity:.9}

.controls{display:flex;align-items:center;gap:10px;margin-left:auto;flex-wrap:wrap}
.search{position:relative;flex:1 1 200px;min-width:150px;max-width:320px}
.search input{
  width:100%; font-family:var(--font-ui); font-size:14px; color:var(--ink);
  background:var(--card); border:1px solid var(--line); border-radius:999px;
  padding:9px 34px 9px 36px; outline:none; transition:border-color .2s,box-shadow .2s;
}
.search input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.search input::placeholder{color:var(--ink-faint)}
.search .ico{position:absolute;left:13px;top:50%;transform:translateY(-50%);width:15px;height:15px;stroke:var(--ink-faint);fill:none;stroke-width:2}
.search .clear{position:absolute;right:8px;top:50%;transform:translateY(-50%);border:none;background:none;cursor:pointer;color:var(--ink-faint);font-size:18px;line-height:1;padding:4px;display:none}
.search .clear:hover{color:var(--accent)}
.search[hidden]{display:none}

.btn{
  font-family:var(--font-ui); font-size:13px; font-weight:600; cursor:pointer;
  background:var(--card); color:var(--ink-soft); border:1px solid var(--line);
  border-radius:999px; padding:8px 13px; display:inline-flex; align-items:center; gap:7px;
  transition:all .18s ease; white-space:nowrap;
}
.btn:hover{border-color:var(--accent);color:var(--accent)}
.btn.on{background:var(--accent);color:#fff;border-color:var(--accent)}
.btn .dot{width:7px;height:7px;border-radius:50%;background:currentColor;opacity:.55}
.btn.on .dot{opacity:1}
.btn svg{width:16px;height:16px}
.btn.icon-only{padding:8px}
.btn .bicon{display:none;font-family:var(--font-jp);font-weight:700;font-size:15px;line-height:1}
#themeBtn .moon{display:none}
html[data-theme="dark"] #themeBtn .sun{display:none}
html[data-theme="dark"] #themeBtn .moon{display:block}
#audioBtn .snd-off{display:none}
#audioBtn:not(.on) .snd-on{display:none}
#audioBtn:not(.on) .snd-off{display:block}
#audioBtn[hidden]{display:none}

/* ---------- Views ---------- */
.view{display:none}
.view.active{display:block;animation:viewIn .35s ease}
@keyframes viewIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

/* ---------- Two-column layout (grammar/vocab) ---------- */
.layout{position:relative;z-index:1;max-width:1200px;margin:0 auto;display:grid;grid-template-columns:248px 1fr;gap:clamp(20px,3vw,44px);padding:clamp(20px,3vw,40px) clamp(16px,4vw,40px) 80px}
.layout.single{grid-template-columns:1fr;max-width:960px}
aside.toc{position:sticky;top:calc(var(--topbar-h) + 22px);align-self:start;max-height:calc(100vh - var(--topbar-h) - 44px);overflow:auto;padding-right:6px}
.toc-h{font-family:var(--font-jp);font-weight:600;font-size:15px;letter-spacing:.06em;color:var(--ink);display:flex;align-items:baseline;gap:8px;margin-bottom:14px;padding-bottom:11px;border-bottom:1px solid var(--line)}
.toc-h small{font-family:var(--font-ui);font-size:10.5px;letter-spacing:.18em;text-transform:uppercase;color:var(--ink-faint)}
.toc ol{list-style:none}
.toc li a{display:flex;align-items:center;gap:10px;padding:6px 9px;border-radius:7px;font-size:13px;color:var(--ink-soft);transition:background .15s,color .15s;border-left:2px solid transparent;cursor:pointer}
.toc li a:hover{background:var(--paper-2);color:var(--ink)}
.toc li a.active{color:var(--accent);font-weight:600;background:var(--accent-soft);border-left-color:var(--accent)}
.toc li a .n{font-family:var(--font-display);font-weight:600;font-size:13px;min-width:22px;color:var(--ink-faint)}
.toc li a.active .n{color:var(--accent)}
.toc li a .lbl{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.toc li a .cnt{font-size:11px;color:var(--ink-faint);font-weight:600}

/* ---------- Mobile day/category nav ---------- */
.mobilenav{
  display:none; position:sticky; top:var(--topbar-h); z-index:40;
  gap:7px; padding:9px clamp(12px,4vw,20px); overflow-x:auto;-webkit-overflow-scrolling:touch;
  background:color-mix(in srgb,var(--paper) 92%,transparent);
  backdrop-filter:blur(8px); -webkit-backdrop-filter:blur(8px); border-bottom:1px solid var(--line);
}
.mobilenav a{
  flex:0 0 auto; font-size:12.5px; font-weight:600; color:var(--ink-soft);
  border:1px solid var(--line); border-radius:999px; padding:5px 11px; background:var(--card); cursor:pointer;
}
.mobilenav a.active{background:var(--accent);color:#fff;border-color:var(--accent)}

/* ---------- Masthead ---------- */
.masthead{margin-bottom:34px;padding-bottom:26px;border-bottom:2px solid var(--ink);position:relative}
.masthead .eyebrow{font-size:11.5px;letter-spacing:.26em;text-transform:uppercase;color:var(--accent);font-weight:600;margin-bottom:12px}
.masthead h1{font-family:var(--font-jp);font-weight:600;font-size:clamp(30px,5.4vw,52px);line-height:1.05;letter-spacing:.02em;margin-bottom:6px}
.masthead h1 .en{font-family:var(--font-display);display:block;font-size:clamp(16px,2.3vw,22px);font-weight:500;letter-spacing:-.01em;color:var(--ink-soft);margin-top:8px}
.masthead p{max-width:580px;color:var(--ink-soft);font-size:14.5px;margin-top:14px}
.masthead .stats{display:flex;gap:22px;margin-top:18px;flex-wrap:wrap}
.masthead .stats div{display:flex;align-items:baseline;gap:7px}
.masthead .stats b{font-family:var(--font-display);font-size:26px;font-weight:600;color:var(--accent)}
.masthead .stats span{font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-faint)}

footer{position:relative;z-index:1;max-width:1200px;margin:0 auto;padding:26px clamp(16px,4vw,40px) 60px;padding-bottom:calc(60px + env(safe-area-inset-bottom));border-top:1px solid var(--line);color:var(--ink-faint);font-size:12.5px;line-height:1.6}

#toTop{position:fixed;right:calc(20px + env(safe-area-inset-right));bottom:calc(20px + env(safe-area-inset-bottom));z-index:60;width:46px;height:46px;border-radius:50%;border:1px solid var(--line);background:var(--card);color:var(--accent);cursor:pointer;box-shadow:0 4px 14px var(--shadow-2);display:grid;place-items:center;opacity:0;pointer-events:none;transition:opacity .25s,transform .25s}
#toTop.show{opacity:1;pointer-events:auto}
#toTop:hover{transform:translateY(-3px)}
#toTop svg{width:20px;height:20px;stroke:currentColor;fill:none;stroke-width:2}

/* wide screens: app-bar layout — brand + controls on row 1, tabs on row 2 */
@media(min-width:901px){
  .brand{order:1}
  .controls{order:2;margin-left:auto}
  .tabs{order:3;width:100%}
}

/* below 900px = compact mode (no sidebar): two-row header,
   brand + scrolling tabs on row 1, controls (search + buttons) on row 2 */
@media(max-width:900px){
  .layout{grid-template-columns:1fr}
  aside.toc{display:none}
  .mobilenav.show{display:flex}
  .day,.vocab-group{scroll-margin-top:calc(var(--topbar-h) + 52px)}
  .brand .titles{display:none}
  header.topbar{gap:10px 12px;row-gap:10px}
  .brand{order:1}
  .tabs{order:2;flex:1 1 0;width:auto;min-width:0}
  .controls{order:3;width:100%;flex-wrap:nowrap;justify-content:flex-end;gap:8px}
  .search{flex:1 1 auto;min-width:0;max-width:none}
}
/* prevent iOS Safari zooming when focusing inputs (needs >=16px) */
@media(max-width:768px){
  .search input,.auth-field input,#fc-cat,#q-cat,select.chip{font-size:16px}
}
@media(max-width:560px){
  .cards{grid-template-columns:1fr}
}
@media(max-width:360px){
  /* very small phones: shrink the furigana label to save room */
  #furiBtn{padding:8px 10px}
  #furiBtn .btxt{display:none}
  #furiBtn .bicon{display:inline-block}
}