/* Slova, Russian by input.
   Palette is token-driven; dark is the default because most study happens at night. */

:root {
  --bg:            #f7f5f1;
  --bg-sunk:       #efece6;
  --panel:         #ffffff;
  --panel-2:       #f3f0ea;
  --line:          #ddd8cf;
  --line-soft:     #e8e4dc;
  --ink:           #23211d;
  --ink-2:         #5b564e;
  --ink-3:         #8a8479;
  --accent:        #b3452b;
  --accent-ink:    #ffffff;
  --accent-soft:   #f6e5df;
  --good:          #2f7d54;
  --good-soft:     #dff0e6;
  --warn:          #9a6b12;
  --warn-soft:     #f7ecd4;
  --bad:           #a83232;
  --bad-soft:      #f7dede;
  --info:          #2c5d8f;
  --info-soft:     #dee9f5;

  /* word-status colours used by the reader */
  --w-new:         #ffe08a;
  --w-new-ink:     #4a3a08;
  --w-learning:    #ffd0a3;
  --w-learning-ink:#4d2f10;
  --w-familiar:    #e2ecc6;
  --w-familiar-ink:#33401c;
  --w-known:       transparent;

  --radius:        14px;
  --radius-sm:     9px;
  --shadow:        0 1px 2px rgba(20,16,10,.06), 0 8px 24px -12px rgba(20,16,10,.18);
  --serif:         "Iowan Old Style", "Charter", "Georgia", "Noto Serif", serif;
  --sans:          -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", system-ui, sans-serif;
  --mono:          "SF Mono", "JetBrains Mono", ui-monospace, Menlo, monospace;
  --topbar-h:      54px;
}

:root[data-theme="dark"], :root:not([data-theme="light"]) {
  --bg:            #14150f;
  --bg-sunk:       #0e0f0a;
  --panel:         #1c1e16;
  --panel-2:       #23261c;
  --line:          #333729;
  --line-soft:     #282c20;
  --ink:           #eae7dd;
  --ink-2:         #a8a397;
  --ink-3:         #756f63;
  --accent:        #e0724f;
  --accent-ink:    #1a1109;
  --accent-soft:   #3a2318;
  --good:          #6fce9a;
  --good-soft:     #1d3327;
  --warn:          #e2b559;
  --warn-soft:     #362b13;
  --bad:           #ea7a7a;
  --bad-soft:      #3a1e1e;
  --info:          #7fb2e8;
  --info-soft:     #1b2a3a;

  --w-new:         #6a5410;
  --w-new-ink:     #ffe9a8;
  --w-learning:    #6b4520;
  --w-learning-ink:#ffd9b3;
  --w-familiar:    #3b4a25;
  --w-familiar-ink:#dcecc0;
  --shadow:        0 1px 2px rgba(0,0,0,.4), 0 10px 30px -14px rgba(0,0,0,.7);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.55 var(--sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overscroll-behavior-y: none;
}

/* ---------- boot ---------- */
.boot { position: fixed; inset: 0; display: grid; place-content: center; gap: .8rem; justify-items: center;
        background: var(--bg); z-index: 200; transition: opacity .3s; }
.boot.gone { opacity: 0; pointer-events: none; }
.boot-mark { width: 54px; height: 54px; border-radius: 16px; background: var(--accent); color: var(--accent-ink);
             display: grid; place-content: center; font: 700 28px/1 var(--serif); }
.boot-text { color: var(--ink-3); font-size: 13px; letter-spacing: .04em; }

/* ---------- top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 60; height: var(--topbar-h);
  display: flex; align-items: center; gap: .6rem; padding: 0 .9rem;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line-soft);
}
.brand { display: flex; align-items: center; gap: .5rem; background: none; border: 0; cursor: pointer; padding: .2rem .2rem; color: inherit; }
.brand-mark { width: 26px; height: 26px; border-radius: 8px; background: var(--accent); color: var(--accent-ink);
              display: grid; place-content: center; font: 700 15px/1 var(--serif); }
.brand-name { font: 600 15px var(--sans); letter-spacing: -.01em; }
.nav { display: flex; gap: .1rem; margin-left: .4rem; overflow-x: auto; scrollbar-width: none; flex: 1; }
.nav::-webkit-scrollbar { display: none; }
.nav button {
  border: 0; background: none; color: var(--ink-2); cursor: pointer; white-space: nowrap;
  padding: .42rem .62rem; border-radius: 9px; font: 500 13.5px var(--sans);
}
.nav button:hover { background: var(--panel-2); color: var(--ink); }
.nav button[aria-current="page"] { background: var(--panel); color: var(--ink); box-shadow: var(--shadow); }
.topbar-right { display: flex; align-items: center; gap: .4rem; }
.icon-btn { border: 1px solid var(--line); background: var(--panel); color: var(--ink-2); cursor: pointer;
            width: 32px; height: 32px; border-radius: 9px; font-size: 14px; display: grid; place-content: center; }
.icon-btn:hover { color: var(--ink); border-color: var(--ink-3); }
.chip-due { border: 1px solid var(--line); background: var(--panel); color: var(--ink-2); cursor: pointer;
            padding: .32rem .6rem; border-radius: 999px; font: 600 12.5px var(--sans); }
.chip-due.hot { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }

/* ---------- layout ---------- */
.view { max-width: 1080px; margin: 0 auto; padding: 1.4rem 1.1rem 5rem; outline: none; }
.view.wide { max-width: 1240px; }
.page-head { margin: 0 0 1.2rem; }
.page-head h1 { margin: 0 0 .28rem; font: 600 25px/1.2 var(--sans); letter-spacing: -.02em; }
.page-head p { margin: 0; color: var(--ink-2); font-size: 14px; max-width: 62ch; }
h2.sec { font: 600 13px var(--sans); letter-spacing: .07em; text-transform: uppercase; color: var(--ink-3);
         margin: 2rem 0 .7rem; }
h2.sec:first-child { margin-top: 0; }

.card { background: var(--panel); border: 1px solid var(--line-soft); border-radius: var(--radius); padding: 1rem 1.1rem; }
.grid { display: grid; gap: .8rem; }
.grid.c2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid.c3 { grid-template-columns: repeat(auto-fit, minmax(215px, 1fr)); }
.grid.c4 { grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); }
.row { display: flex; gap: .55rem; align-items: center; flex-wrap: wrap; }
.row.between { justify-content: space-between; }
.spacer { flex: 1; }
.muted { color: var(--ink-2); }
.dim   { color: var(--ink-3); }
.small { font-size: 13px; }
.tiny  { font-size: 12px; }
.ru { font-family: var(--serif); }

/* ---------- buttons ---------- */
.btn {
  border: 1px solid var(--line); background: var(--panel); color: var(--ink);
  padding: .5rem .85rem; border-radius: var(--radius-sm); cursor: pointer;
  font: 500 13.5px var(--sans); display: inline-flex; align-items: center; gap: .4rem;
  transition: background .12s, border-color .12s, transform .06s;
}
.btn:hover { background: var(--panel-2); border-color: var(--ink-3); }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.primary:hover { filter: brightness(1.08); }
.btn.ghost { background: none; border-color: transparent; color: var(--ink-2); }
.btn.ghost:hover { background: var(--panel-2); color: var(--ink); }
.btn.sm { padding: .32rem .6rem; font-size: 12.5px; }
.btn.lg { padding: .7rem 1.2rem; font-size: 15px; }
.btn.block { width: 100%; justify-content: center; }

input[type="text"], input[type="number"], textarea, select {
  background: var(--bg-sunk); border: 1px solid var(--line); color: var(--ink);
  border-radius: var(--radius-sm); padding: .55rem .7rem; font: 14px var(--sans); width: 100%;
}
input:focus, textarea:focus, select:focus { outline: 2px solid var(--accent); outline-offset: -1px; border-color: transparent; }
textarea { resize: vertical; min-height: 110px; line-height: 1.6; }
label.field { display: block; margin-bottom: .8rem; }
label.field > span { display: block; font-size: 12.5px; color: var(--ink-2); margin-bottom: .3rem; }

/* ---------- stats ---------- */
.stat { background: var(--panel); border: 1px solid var(--line-soft); border-radius: var(--radius); padding: .85rem .95rem; }
.stat .k { font: 600 11px var(--sans); letter-spacing: .07em; text-transform: uppercase; color: var(--ink-3); }
.stat .v { font: 600 26px/1.15 var(--sans); letter-spacing: -.02em; margin-top: .25rem; }
.stat .v small { font-size: 14px; font-weight: 500; color: var(--ink-3); }
.stat .sub { font-size: 12px; color: var(--ink-3); margin-top: .1rem; }

.bar { height: 7px; background: var(--bg-sunk); border-radius: 999px; overflow: hidden; display: flex; }
.bar > i { display: block; height: 100%; }
.bar > i.known { background: var(--good); }
.bar > i.fam   { background: color-mix(in srgb, var(--good) 55%, var(--bg-sunk)); }
.bar > i.learn { background: var(--warn); }
.bar > i.new   { background: var(--accent); }

.pill { display: inline-flex; align-items: center; gap: .3rem; padding: .16rem .5rem; border-radius: 999px;
        font: 600 11.5px var(--sans); border: 1px solid transparent; }
.pill.a1 { background: var(--good-soft); color: var(--good); }
.pill.a2 { background: var(--info-soft); color: var(--info); }
.pill.b1 { background: var(--warn-soft); color: var(--warn); }
.pill.b2 { background: var(--bad-soft); color: var(--bad); }
.pill.neutral { background: var(--panel-2); color: var(--ink-2); border-color: var(--line-soft); }

/* ---------- reader ---------- */
.reader-wrap { display: grid; grid-template-columns: minmax(0,1fr) 320px; gap: 1.1rem; align-items: start; }
@media (max-width: 900px) { .reader-wrap { grid-template-columns: 1fr; } }

.reader {
  background: var(--panel); border: 1px solid var(--line-soft); border-radius: var(--radius);
  padding: 1.6rem 1.8rem 2.4rem; font-family: var(--serif); font-size: 20px; line-height: 1.95;
}
@media (max-width: 620px) { .reader { padding: 1.1rem 1rem 2rem; font-size: 19px; } }
.reader h3 { font: 600 24px/1.3 var(--serif); margin: 0 0 1rem; }
.reader p { margin: 0 0 1.15rem; }
.sent { border-radius: 5px; padding: 1px 0; }
.sent.active { background: color-mix(in srgb, var(--info) 15%, transparent); }
.sent.playing { background: color-mix(in srgb, var(--accent) 18%, transparent); }

.tok { border-radius: 4px; padding: 1px 1px; cursor: pointer; }
.tok:hover { outline: 2px solid var(--accent); outline-offset: 1px; }
.tok.s0 { background: var(--w-new); color: var(--w-new-ink); }
.tok.s1 { background: var(--w-learning); color: var(--w-learning-ink); }
.tok.s2 { background: var(--w-familiar); color: var(--w-familiar-ink); }
.tok.s3 { background: transparent; }
.tok.s4 { background: transparent; color: inherit; cursor: default; }
.tok.s4:hover { outline: none; }
.tok.sel { outline: 2px solid var(--accent); outline-offset: 1px; }

/* Highlight intensity. A fresh text is entirely unknown words, which at full
   strength is a wall of colour. "subtle" keeps the signal as an underline. */
.reader[data-hl="subtle"] .tok.s0,
.reader[data-hl="subtle"] .tok.s1,
.reader[data-hl="subtle"] .tok.s2 { background: transparent; color: inherit; }
.reader[data-hl="subtle"] .tok.s0 { box-shadow: inset 0 -2px 0 var(--w-new); }
.reader[data-hl="subtle"] .tok.s1 { box-shadow: inset 0 -2px 0 var(--w-learning); }
.reader[data-hl="subtle"] .tok.s2 { box-shadow: inset 0 -2px 0 var(--w-familiar); }
.reader[data-hl="off"] .tok { background: transparent; color: inherit; box-shadow: none; }

.side { position: sticky; top: calc(var(--topbar-h) + 1rem); display: grid; gap: .8rem; }
@media (max-width: 900px) { .side { position: static; } }

.lookup { background: var(--panel); border: 1px solid var(--line-soft); border-radius: var(--radius); padding: 1rem; }
.lookup .head-word { font: 600 27px/1.2 var(--serif); letter-spacing: -.01em; }
.lookup .lemma-note { font-size: 12.5px; color: var(--ink-3); margin-top: .2rem; }
.lookup .gloss { font-size: 15px; margin: .7rem 0 .2rem; }
.lookup .ctx { font-family: var(--serif); font-size: 14.5px; color: var(--ink-2); background: var(--bg-sunk);
               border-left: 3px solid var(--line); padding: .55rem .7rem; border-radius: 0 8px 8px 0; margin: .7rem 0; }
.status-picker { display: grid; grid-template-columns: repeat(5, 1fr); gap: .25rem; margin-top: .6rem; }
.status-picker button { border: 1px solid var(--line); background: var(--panel-2); border-radius: 8px;
                        padding: .42rem .2rem; cursor: pointer; font: 600 12px var(--sans); color: var(--ink-2); }
.status-picker button[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }

/* ---------- flashcards ---------- */
.card-stage { max-width: 620px; margin: 1.4rem auto 0; }
.flashcard {
  background: var(--panel); border: 1px solid var(--line-soft); border-radius: 18px;
  min-height: 300px; display: grid; place-content: center; text-align: center;
  padding: 2.2rem 1.6rem; gap: .8rem; box-shadow: var(--shadow);
}
.flashcard .prompt { font: 600 40px/1.25 var(--serif); letter-spacing: -.015em; }
@media (max-width: 620px) { .flashcard .prompt { font-size: 32px; } }
.flashcard .prompt-sub { font-size: 13px; color: var(--ink-3); letter-spacing: .05em; text-transform: uppercase; }
.flashcard .answer { font: 500 21px/1.4 var(--sans); color: var(--ink); }
.flashcard .example { font-family: var(--serif); font-size: 17px; line-height: 1.7; color: var(--ink-2);
                      border-top: 1px solid var(--line-soft); padding-top: .9rem; margin-top: .3rem; }
.flashcard .example b { color: var(--accent); font-weight: 600; }
.cloze-blank { display: inline-block; min-width: 3.5em; border-bottom: 2px solid var(--accent); }
.grade-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: .5rem; margin-top: 1rem; }
.grade-row button { border: 1px solid var(--line); background: var(--panel); border-radius: 11px; cursor: pointer;
                    padding: .65rem .3rem; display: grid; gap: .15rem; color: var(--ink); }
.grade-row button .g { font: 600 14px var(--sans); }
.grade-row button .i { font: 500 11.5px var(--mono); color: var(--ink-3); }
.grade-row button[data-g="1"]:hover { border-color: var(--bad); background: var(--bad-soft); }
.grade-row button[data-g="2"]:hover { border-color: var(--warn); background: var(--warn-soft); }
.grade-row button[data-g="3"]:hover { border-color: var(--good); background: var(--good-soft); }
.grade-row button[data-g="4"]:hover { border-color: var(--info); background: var(--info-soft); }

/* ---------- listening ---------- */
.dictation-line { font-family: var(--serif); font-size: 22px; line-height: 1.8; letter-spacing: .01em; }
.dictation-line .ok  { color: var(--good); }
.dictation-line .miss{ color: var(--bad); text-decoration: underline wavy var(--bad); text-underline-offset: 4px; }
.dictation-line .extra { color: var(--ink-3); text-decoration: line-through; }
.dict-input { font-family: var(--serif) !important; font-size: 20px !important; line-height: 1.7 !important; }
.replay-count { font: 600 12px var(--mono); color: var(--ink-3); }
.speed-row { display: flex; gap: .3rem; }
.speed-row button { border: 1px solid var(--line); background: var(--panel); border-radius: 8px; cursor: pointer;
                    padding: .28rem .5rem; font: 600 12px var(--mono); color: var(--ink-2); }
.speed-row button[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }

/* ---------- alphabet ---------- */
.letter-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(112px, 1fr)); gap: .6rem; }
.letter {
  background: var(--panel); border: 1px solid var(--line-soft); border-radius: var(--radius-sm);
  padding: .7rem .5rem; text-align: center; cursor: pointer;
}
.letter:hover { border-color: var(--accent); }
.letter .glyph { font: 500 27px/1.15 var(--serif); }
.letter .sound { font-size: 12.5px; color: var(--ink-2); margin-top: .2rem; }
.letter .trap { font-size: 11px; color: var(--accent); margin-top: .25rem; font-weight: 600; }
.letter[data-trap="1"] { border-color: color-mix(in srgb, var(--accent) 45%, var(--line-soft)); }

/* ---------- grammar ---------- */
.gr-body { max-width: 70ch; }
.gr-body h3 { font: 600 19px var(--sans); margin: 1.8rem 0 .5rem; }
.gr-body p { color: var(--ink-2); }
.gr-body .rule { background: var(--info-soft); border-left: 3px solid var(--info); padding: .7rem .9rem;
                 border-radius: 0 8px 8px 0; margin: .9rem 0; color: var(--ink); }
.gr-body .warnbox { background: var(--warn-soft); border-left: 3px solid var(--warn); padding: .7rem .9rem;
                    border-radius: 0 8px 8px 0; margin: .9rem 0; color: var(--ink); }
.ex-list { display: grid; gap: .5rem; margin: .8rem 0; }
.ex { background: var(--panel-2); border-radius: 9px; padding: .6rem .8rem; display: flex; gap: .7rem; align-items: baseline; }
.ex .ru { font-family: var(--serif); font-size: 17px; }
.ex .en { color: var(--ink-3); font-size: 13.5px; }
.ex .play { margin-left: auto; }
table.decl { width: 100%; border-collapse: collapse; font-size: 14px; margin: .9rem 0; }
table.decl th, table.decl td { border: 1px solid var(--line-soft); padding: .42rem .55rem; text-align: left; }
table.decl th { background: var(--panel-2); font: 600 12px var(--sans); color: var(--ink-2); }
table.decl td.ru { font-family: var(--serif); font-size: 16px; }
.table-scroll { overflow-x: auto; }

/* ---------- lists ---------- */
.list { display: grid; gap: .45rem; }
.item {
  display: flex; align-items: center; gap: .8rem; background: var(--panel);
  border: 1px solid var(--line-soft); border-radius: var(--radius-sm); padding: .65rem .85rem; cursor: pointer;
}
.item:hover { border-color: var(--ink-3); }
.item .t { font-weight: 500; }
.item .d { font-size: 12.5px; color: var(--ink-3); }
.item .grow { flex: 1; min-width: 0; }
.item .grow .t, .item .grow .d { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ---------- toast + modal ---------- */
.toast {
  position: fixed; left: 50%; bottom: 1.6rem; transform: translateX(-50%) translateY(140%);
  background: var(--ink); color: var(--bg); padding: .6rem 1rem; border-radius: 999px;
  font: 500 13.5px var(--sans); z-index: 120; transition: transform .26s cubic-bezier(.2,.8,.2,1); max-width: 90vw;
}
.toast.show { transform: translateX(-50%) translateY(0); }
.modal { position: fixed; inset: 0; z-index: 140; display: grid; place-items: center; padding: 1rem;
         background: rgba(0,0,0,.5); backdrop-filter: blur(3px); }
.modal .sheet { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
                padding: 1.2rem; max-width: 520px; width: 100%; max-height: 85vh; overflow: auto; box-shadow: var(--shadow); }

.empty { text-align: center; padding: 3rem 1rem; color: var(--ink-3); }
.empty .big { font-size: 34px; margin-bottom: .5rem; }

.why { font-size: 12.5px; color: var(--ink-3); border-left: 2px solid var(--line); padding-left: .7rem; margin-top: .6rem; }
.why b { color: var(--ink-2); font-weight: 600; }

kbd { font: 600 11px var(--mono); background: var(--panel-2); border: 1px solid var(--line);
      border-bottom-width: 2px; border-radius: 5px; padding: .1rem .32rem; color: var(--ink-2); }

a { color: var(--accent); }