/* ===== Zhongwen (中文): нефритово-яшмовый рабочий стол ===== */
:root {
  --paper: #FBF9F4;
  --side: #F1EFE8;
  --card: #FFFFFF;
  --sunk: #EAE7DE;
  --ink: #161B1A;
  --ink-2: #485451;
  --ink-3: #6C7875;
  --line: #DCD8CE;
  --guide: #DFB5AE;
  --jade: #1B6B5C;
  --jade-fill: #1B6B5C;
  --jade-ink: #FFFFFF;
  --jade-soft: #DFEFEA;
  --teal: #2B7A78;
  --cinnabar: #C83E32;
  --cinnabar-soft: #F9E2DF;
  --gold: #A9721B;
  --gold-soft: #F7ECDA;
  --r: 14px;
  --r-s: 10px;
  --side-w: 238px;
  --ease: cubic-bezier(.2, .8, .2, 1);
  --font-ui: "Onest", "Segoe UI Variable Text", "Segoe UI", system-ui, -apple-system, Roboto, Arial, sans-serif;
  --font-zh: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", sans-serif;
  --font-zh-serif: "Noto Serif SC", "Songti SC", "KaiTi", "Microsoft YaHei", serif;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0F1514;
    --side: #131B19;
    --card: #182320;
    --sunk: #1F2D29;
    --ink: #ECF2F0;
    --ink-2: #A6B8B3;
    --ink-3: #7E928C;
    --line: #273833;
    --guide: #5B3834;
    --jade: #5CC8B0;
    --jade-fill: #248570;
    --jade-ink: #FFFFFF;
    --jade-soft: #1B3831;
    --teal: #62C3C0;
    --cinnabar: #E6685C;
    --cinnabar-soft: #3D211E;
    --gold: #E4B257;
    --gold-soft: #362C19;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --paper: #0F1514;
  --side: #131B19;
  --card: #182320;
  --sunk: #1F2D29;
  --ink: #ECF2F0;
  --ink-2: #A6B8B3;
  --ink-3: #7E928C;
  --line: #273833;
  --guide: #5B3834;
  --jade: #5CC8B0;
  --jade-fill: #248570;
  --jade-ink: #FFFFFF;
  --jade-soft: #1B3831;
  --teal: #62C3C0;
  --cinnabar: #E6685C;
  --cinnabar-soft: #3D211E;
  --gold: #E4B257;
  --gold-soft: #362C19;
  color-scheme: dark;
}

/* ===== Базовые стили ============================================== */
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; overflow-x: clip; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.55 var(--font-ui);
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  overflow-x: clip;
}
[lang="zh"], .zh { font-family: var(--font-zh); }
.zh-serif { font-family: var(--font-zh-serif); }
a { color: var(--jade); text-underline-offset: 3px; }
button, input, select, textarea { font: inherit; color: inherit; }
input, select, textarea { font-size: 16px; } /* предотвращает автозум на iOS */
button, .btn, .nav-link, .pill { touch-action: manipulation; }
:focus-visible { outline: 2px solid var(--jade); outline-offset: 2px; border-radius: 6px; }
main:focus { outline: none; }

h1, h2, h3, h4 { line-height: 1.24; margin: 0 0 .5em; overflow-wrap: anywhere; }
h1 { font-size: clamp(1.5rem, 1.15rem + 1.4vw, 2.2rem); font-weight: 700; letter-spacing: -.02em; }
h2 { font-size: 1.3rem; font-weight: 650; }
h3 { font-size: 1.08rem; font-weight: 600; }
p { margin: 0 0 .75em; overflow-wrap: anywhere; }
.muted { color: var(--ink-2); }
.dim { color: var(--ink-3); }
.num { font-variant-numeric: tabular-nums; }

/* ===== Каркас ===================================================== */
.shell {
  display: grid;
  grid-template-columns: var(--side-w) minmax(0, 1fr);
  min-height: 100vh;
  min-height: 100dvh;
}
.side {
  position: sticky;
  top: 0;
  height: 100vh;
  height: 100dvh;
  padding: 24px 14px 18px;
  background: var(--side);
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 6px 10px 18px;
  text-decoration: none;
  color: inherit;
}
.brand-seal {
  min-width: 54px;
  height: 42px;
  padding: 0 9px;
  border-radius: 11px;
  background: var(--jade-fill);
  color: var(--jade-ink);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .24);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-zh);
  font-size: 1.08rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: .06em;
  white-space: nowrap;
  flex-shrink: 0;
}
.brand-txt { display: flex; flex-direction: column; line-height: 1.15; }
.brand-txt b { font-size: 1.05rem; letter-spacing: -.01em; }
.brand-txt small { font-size: .78rem; color: var(--ink-2); }

.nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 11px;
  text-decoration: none;
  color: var(--ink-2);
  font-weight: 550;
  transition: background .15s var(--ease), color .15s var(--ease);
}
.nav-link:hover { background: var(--sunk); color: var(--ink); }
.nav-link.active { background: var(--jade-soft); color: var(--jade); font-weight: 650; }
.nav-ico {
  width: 24px;
  text-align: center;
  font-family: var(--font-zh-serif);
  font-size: 1.05rem;
  flex-shrink: 0;
}
.badge {
  margin-left: auto;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--jade-fill);
  color: var(--jade-ink);
  font-size: .75rem;
  font-weight: 650;
}
.side-foot {
  margin-top: auto;
  padding-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.user-chip {
  padding: 8px 12px;
  border-radius: 10px;
  background: var(--sunk);
  font-size: .85rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
}
.theme-btn {
  width: 100%;
  padding: 9px 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--card);
  cursor: pointer;
  font-size: .88rem;
  font-weight: 550;
  text-align: left;
}
.theme-btn:hover { background: var(--sunk); }

main { min-width: 0; padding: 28px clamp(16px, 3.2vw, 44px) 64px; }
.page { max-width: 1060px; margin: 0 auto; min-width: 0; }

/* ===== Кнопки и формы ============================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  min-height: 40px;
  padding: 8px 16px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  font-weight: 600;
  font-size: .92rem;
  cursor: pointer;
  text-decoration: none;
  transition: transform .1s var(--ease), background .15s var(--ease), border-color .15s;
}
.btn:hover { background: var(--sunk); }
.btn:active { transform: scale(.98); }
.btn.primary { background: var(--jade-fill); border-color: var(--jade-fill); color: var(--jade-ink); }
.btn.primary:hover { filter: brightness(1.06); background: var(--jade-fill); }
.btn.soft { background: var(--jade-soft); border-color: transparent; color: var(--jade); }
.btn.danger { background: var(--cinnabar-soft); border-color: transparent; color: var(--cinnabar); }
.btn.sm { min-height: 33px; padding: 5px 11px; font-size: .84rem; border-radius: 8px; }
.btn.big { min-height: 48px; padding: 11px 22px; font-size: 1rem; }
.btn:disabled { opacity: .55; cursor: not-allowed; }

.input, select.input {
  width: 100%;
  min-height: 42px;
  padding: 8px 13px;
  border-radius: 10px;
  border: 1.5px solid var(--line);
  background: var(--card);
  color: var(--ink);
}
.input:focus, select.input:focus { outline: none; border-color: var(--jade); }

/* ===== Карточки, сетки и бейджи =================================== */
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: 18px 20px;
  min-width: 0;
}
.card + .card { margin-top: 14px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.grid-auto { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.between { display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 9px;
  border-radius: 999px;
  font-size: .76rem;
  font-weight: 600;
  background: var(--sunk);
  color: var(--ink-2);
}
.tag.jade { background: var(--jade-soft); color: var(--jade); }
.tag.gold { background: var(--gold-soft); color: var(--gold); }
.tag.cinnabar { background: var(--cinnabar-soft); color: var(--cinnabar); }

.tabs {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  padding: 4px;
  border-radius: 12px;
  background: var(--sunk);
  margin-bottom: 18px;
}
.tab {
  flex: 1 1 auto;
  min-height: 36px;
  padding: 7px 13px;
  border: 0;
  border-radius: 9px;
  background: transparent;
  color: var(--ink-2);
  font-weight: 600;
  font-size: .9rem;
  cursor: pointer;
  white-space: nowrap;
}
.tab.on { background: var(--card); color: var(--jade); box-shadow: 0 1px 3px rgba(0, 0, 0, .06); }

/* ===== Персональная врезка «От нас» =============================== */
.personal-note {
  background: linear-gradient(135deg, var(--jade-soft), var(--gold-soft));
  border: 1px solid var(--line);
  border-left: 4px solid var(--jade);
  border-radius: var(--r);
  padding: 14px 18px;
  margin: 14px 0;
}
.personal-note-head { font-weight: 650; font-size: .95rem; color: var(--jade); margin-bottom: 4px; }

/* ===== Карта уроков =============================================== */
.block-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: 18px;
  margin-bottom: 18px;
}
.lesson-row {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 13px 14px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--paper);
  text-decoration: none;
  color: inherit;
  margin-top: 10px;
  transition: border-color .15s, background .15s;
}
.lesson-row:hover { border-color: var(--jade); background: var(--card); }
.lesson-no {
  width: 44px;
  height: 44px;
  border-radius: 11px;
  background: var(--jade-soft);
  color: var(--jade);
  display: grid;
  place-items: center;
  font-weight: 700;
}
.lesson-row.done .lesson-no { background: var(--jade-fill); color: var(--jade-ink); }

/* ===== Слова, диалоги, грамматика ================================= */
.word-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  padding: 14px 16px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--card);
}
.word-zh { font-size: 1.5rem; font-weight: 650; line-height: 1.25; }
.word-py { color: var(--jade); font-weight: 600; font-size: .95rem; }
.word-ex { margin-top: 8px; padding-top: 8px; border-top: 1px dashed var(--line); font-size: .9rem; }

.dialogue-line {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 12px;
  align-items: start;
  padding: 12px 14px;
  border-radius: 12px;
  background: var(--paper);
  border: 1px solid var(--line);
}
.dialogue-line + .dialogue-line { margin-top: 8px; }
.speaker-badge {
  padding: 3px 9px;
  border-radius: 8px;
  font-weight: 650;
  font-size: .84rem;
  background: var(--jade-soft);
  color: var(--jade);
  white-space: nowrap;
}

.gram-box {
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: 16px 18px;
  background: var(--card);
}
.gram-box + .gram-box { margin-top: 12px; }
.gram-pattern {
  display: inline-block;
  margin: 6px 0 10px;
  padding: 6px 12px;
  border-radius: 9px;
  background: var(--jade-soft);
  color: var(--jade);
  font-weight: 650;
}
.gram-trap {
  margin-top: 10px;
  padding: 10px 13px;
  border-radius: 10px;
  background: var(--cinnabar-soft);
  font-size: .9rem;
}

/* ===== Клетка прописи Ми-цзы-гэ + SVG ============================== */
.hanzi-stage {
  position: relative;
  width: 260px;
  max-width: 100%;
  aspect-ratio: 1 / 1;
  border: 2px solid var(--jade);
  border-radius: 12px;
  background: var(--card);
  overflow: hidden;
  touch-action: none;
  user-select: none;
}
.hanzi-stage svg, .hanzi-stage canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.hanzi-stage canvas { z-index: 3; cursor: crosshair; }
.hanzi-card-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 10px 8px;
  border: 1.5px solid var(--line);
  border-radius: 12px;
  background: var(--card);
  cursor: pointer;
  min-width: 72px;
}
.hanzi-card-btn.on { border-color: var(--jade); background: var(--jade-soft); }
.hanzi-card-btn .big-ch { font-size: 2rem; line-height: 1.1; }

/* ===== Пиньинь и FSRS ============================================= */
.syllable-btn {
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--card);
  cursor: pointer;
  text-align: center;
  min-width: 68px;
}
.syllable-btn:hover { border-color: var(--jade); background: var(--jade-soft); }
.flashcard {
  max-width: 600px;
  margin: 0 auto;
  padding: 26px 22px;
  border-radius: 18px;
  border: 1.5px solid var(--line);
  background: var(--card);
  text-align: center;
}
.flashcard-zh { font-size: clamp(2.4rem, 5vw, 3.6rem); font-weight: 700; margin: 10px 0; }
.rating-bar {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  margin-top: 18px;
}
.rate-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 10px 6px;
  border-radius: 11px;
  border: 1.5px solid var(--line);
  background: var(--paper);
  cursor: pointer;
  font-weight: 650;
}
.rate-btn small { font-weight: 500; color: var(--ink-2); font-size: .78rem; }
.rate-btn[data-r="1"] { border-color: var(--cinnabar); color: var(--cinnabar); }
.rate-btn[data-r="3"] { border-color: var(--jade); color: var(--jade); }
.rate-btn[data-r="4"] { background: var(--jade-soft); border-color: var(--jade); color: var(--jade); }

/* ===== Тематические паутинки ====================================== */
.spider-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 12px;
}
.spider-branch {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px;
  background: var(--paper);
}
.spider-word {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin: 4px 4px 0 0;
  padding: 5px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--card);
  cursor: pointer;
  font-size: .88rem;
}
.spider-word.learned { border-color: var(--jade); background: var(--jade-soft); }

/* ===== Прогресс-бары и тосты ====================================== */
.prog-track { height: 9px; border-radius: 999px; background: var(--sunk); overflow: hidden; }
.prog-fill { height: 100%; border-radius: 999px; background: var(--jade-fill); transition: width .3s var(--ease); }

#toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%) translateY(20px);
  padding: 10px 18px;
  border-radius: 999px;
  background: var(--ink);
  color: var(--paper);
  font-size: .9rem;
  font-weight: 550;
  opacity: 0;
  pointer-events: none;
  z-index: 90;
  transition: opacity .2s, transform .2s;
  max-width: calc(100vw - 32px);
}
#toast.on { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ===== Мобильная адаптация (<= 820px, iPhone 375px safe) ========== */
@media (max-width: 820px) {
  .shell { grid-template-columns: minmax(0, 1fr); padding-bottom: 72px; }
  .side {
    position: fixed;
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;
    height: auto;
    z-index: 50;
    flex-direction: row;
    align-items: center;
    justify-content: space-around;
    padding: 6px 6px calc(6px + env(safe-area-inset-bottom));
    border-right: 0;
    border-top: 1px solid var(--line);
    gap: 2px;
  }
  .brand, .side-foot { display: none; }
  .nav-link {
    flex-direction: column;
    gap: 2px;
    padding: 6px 8px;
    font-size: .72rem;
    position: relative;
    min-width: 0;
  }
  .nav-link span:last-child { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 68px; }
  .badge { position: absolute; top: 2px; right: 4px; margin: 0; padding: 1px 5px; font-size: .68rem; }
  main { padding: 18px 14px 92px; }
  .grid-2, .grid-3 { grid-template-columns: minmax(0, 1fr); }
  .rating-bar { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .word-item { grid-template-columns: minmax(0, 1fr); }
  .dialogue-line { grid-template-columns: minmax(0, 1fr); }
}