:root{
  --bg:#0e0e10;--soft:#17171b;--row:#161a20;--line:#2a2a31;--ink:#f2f4f8;--mut:#9aa0ac;
  --acc:#a855f7;--acc-ink:#d8b4fe;--known:#46b35e;--learning:#e0a73a;--ignore:#6b7280;--green:#6ee7a0;
  --sb:#161618;
}
*{box-sizing:border-box}[hidden]{display:none !important}
html,body{margin:0;height:100%}
body{background:var(--bg);color:var(--ink);font:14px/1.5 Roboto,"Segoe UI",system-ui,Arial,sans-serif}
.spacer{flex:1 1 auto}.muted{color:var(--mut)}.small{font-size:12px}.accent{color:var(--acc-ink)}
.logo{display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;border-radius:50%;background:var(--acc);color:#fff;font-weight:700;font-size:12px;flex:none}
.btn{appearance:none;cursor:pointer;font:inherit;background:var(--row);color:var(--ink);border:1px solid var(--line);border-radius:8px;padding:8px 14px;transition:background .12s}
.btn:hover{background:#20242c}.btn.primary{background:var(--acc);border-color:var(--acc);color:#fff}.btn.primary:hover{filter:brightness(1.08)}
.sel,.search{background:var(--row);color:var(--ink);border:1px solid var(--line);border-radius:8px;padding:6px 10px;font:inherit}
.search{border-radius:999px;min-width:220px}

/* login */
.wrap{max-width:1100px;margin:0 auto;padding:18px 16px}
.login-card{max-width:460px;margin:10vh auto;background:var(--soft);border:1px solid var(--line);border-radius:16px;padding:28px;text-align:center}
.login-brand{display:flex;align-items:center;justify-content:center;gap:10px;font-size:22px;font-weight:700;margin-bottom:8px}
.field{display:flex;flex-direction:column;gap:6px;text-align:left;margin:18px 0;color:var(--mut);font-size:13px}
.field input{background:var(--row);color:var(--ink);border:1px solid var(--line);border-radius:8px;padding:10px 12px;font:inherit}

/* ---- LR-style shell: left sidebar + content ---- */
.shell{display:flex;height:100vh;overflow:hidden}
.sidebar{width:212px;flex:none;background:var(--sb);border-right:1px solid var(--line);display:flex;flex-direction:column;padding:0}
.sb-brand{display:flex;align-items:center;gap:10px;padding:16px 16px 12px;font-size:18px;font-weight:300}
.sb-brand-txt b{font-weight:800}
.sb-lang{display:flex;align-items:center;gap:8px;margin:0 12px 10px;background:var(--row);border:1px solid var(--line);border-radius:10px;padding:8px 10px}
.lang-badge{display:inline-flex;align-items:center;justify-content:center;width:26px;height:26px;border-radius:6px;background:var(--acc);color:#fff;font-weight:700;font-size:11px}
.sb-lang-sel{flex:1 1 auto;background:transparent;border:none;color:var(--ink);font:inherit;font-size:14px;cursor:pointer}
.sb-nav{display:flex;flex-direction:column;padding:6px 0;gap:1px}
.sb-foot{margin-top:auto;padding:8px 0 16px;border-top:1px solid var(--line)}
.sb-item{display:flex;align-items:center;gap:12px;width:100%;text-align:left;appearance:none;cursor:pointer;font:inherit;font-size:15px;color:var(--mut);background:transparent;border:none;border-left:3px solid transparent;padding:11px 16px}
.sb-item:hover{color:var(--ink);background:#1d1d22}
.sb-item.is-active{color:#fff;background:#201a2b;border-left-color:var(--acc)}
.sb-ico{width:20px;text-align:center;opacity:.9}

.content{flex:1 1 auto;display:flex;flex-direction:column;overflow:hidden}
.ctop{display:flex;align-items:center;gap:8px;border-bottom:1px solid var(--line);padding:0 18px;min-height:52px;background:var(--soft)}
.ctabs{display:flex;gap:2px}
.ctab{appearance:none;cursor:pointer;font:inherit;font-weight:600;letter-spacing:.3px;background:transparent;color:var(--mut);border:none;border-bottom:3px solid transparent;padding:16px 16px 13px;text-transform:uppercase;font-size:13px}
.ctab:hover{color:var(--ink)}.ctab.is-active{color:#fff;border-bottom-color:var(--acc)}
.csec-title{font-weight:700;font-size:15px}
.cbody{flex:1 1 auto;overflow:auto;padding:18px}

.toolbar{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:12px}
.chips{display:flex;gap:6px;flex-wrap:wrap}
.chip{font-size:12px;font-weight:600;border:1px solid var(--line);border-radius:999px;padding:4px 12px;background:var(--row);color:var(--mut);cursor:pointer}
.chip .n{opacity:.8;margin-left:4px;font-weight:400}.chip.is-active{color:#fff;background:#20242c}
.count{color:var(--mut);font-size:12px;margin:0 2px 8px}

.list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:6px}
.item{background:var(--row);border:1px solid var(--line);border-radius:10px;padding:10px 12px;border-left:3px solid #3a414c}
.item.s-known{border-left-color:var(--known)}.item.s-learning{border-left-color:var(--learning)}.item.s-ignore{border-left-color:var(--ignore);opacity:.7}
.item .w{font-size:16px;font-weight:700}.item .lemma{color:var(--mut);font-size:12px;margin-left:8px}.item .tr{color:var(--acc-ink);font-size:13px;margin-left:8px}
.item .sent{color:var(--mut);font-size:12.5px;font-style:italic;margin-top:3px}.item .sent b{color:var(--ink);font-style:normal}

.freq-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:6px}
.freq-divider{grid-column:1/-1;color:var(--mut);font-size:12px;font-weight:600;letter-spacing:.4px;padding:12px 2px 4px;border-bottom:1px solid var(--line);margin-top:4px}
.freq-divider:first-child{margin-top:0}
.freq-cell{display:flex;align-items:baseline;gap:6px;background:var(--row);border:1px solid var(--line);border-left:3px solid #3a414c;border-radius:8px;padding:6px 10px}
.freq-cell .r{font-size:10px;color:#5e6675;min-width:30px}.freq-cell .w{font-size:13px;font-weight:600}
.freq-cell.s-known{border-left-color:var(--known)}.freq-cell.s-known .w{color:var(--known)}
.freq-cell.s-learning{border-left-color:var(--learning)}.freq-cell.s-learning .w{color:var(--learning)}
.freq-cell.s-ignore{border-left-color:var(--ignore);opacity:.55}.freq-cell.s-suggest{border-left-color:var(--acc)}

.pp-dash{display:flex;flex-direction:column;align-items:center;gap:18px;padding:48px}
.pp-logo{font-size:30px;font-weight:800;margin:0}
.pp-due{display:flex;flex-direction:column;align-items:center}.big{font-size:40px;font-weight:800}.big-btn{font-size:16px;padding:12px 28px;border-radius:10px}
.pp-card{background:var(--soft);border:1px solid var(--line);border-radius:16px;padding:36px;text-align:center;display:flex;flex-direction:column;align-items:center;gap:16px;min-height:240px;justify-content:center;max-width:720px;margin:0 auto}
.pp-prompt{font-size:22px}.pp-prompt .cloze{color:var(--acc-ink);border-bottom:2px dashed var(--acc);padding:0 6px}
.pp-word{font-size:26px;font-weight:800}.pp-trans{font-size:18px;color:var(--acc-ink)}.pp-sent{color:var(--mut);font-style:italic}.pp-sent b{color:var(--ink);font-style:normal}
.grades{display:flex;gap:8px;flex-wrap:wrap;justify-content:center}
.grade{cursor:pointer;font:inherit;border-radius:10px;padding:10px 16px;border:1px solid var(--line);background:var(--row);color:var(--ink);display:flex;flex-direction:column;gap:2px;min-width:84px}
.grade:hover{background:#20242c}.grade .lab{font-weight:700}.grade .int{font-size:11px;color:var(--mut)}
.grade.g-again{border-bottom:3px solid #d65a5a}.grade.g-hard{border-bottom:3px solid var(--learning)}.grade.g-good{border-bottom:3px solid #3a9bd6}.grade.g-easy{border-bottom:3px solid var(--known)}
.pp-done{text-align:center;padding:48px}

.kpis{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin-bottom:14px}
.kpi{background:var(--soft);border:1px solid var(--line);border-radius:12px;padding:16px;text-align:center}
.kpi .v{font-size:26px;font-weight:800}.kpi .l{color:var(--mut);font-size:12px}
.card{background:var(--soft);border:1px solid var(--line);border-radius:14px;padding:18px;margin-bottom:14px;max-width:760px}
.card h2{margin:0 0 12px;font-size:16px}
.funnel{display:flex;flex-direction:column;gap:8px}
.stage{display:flex;justify-content:space-between;background:var(--row);border:1px solid var(--line);border-radius:10px;padding:12px;border-left:3px solid var(--acc)}
.stage .sv{font-weight:800;font-size:18px}
.stage.s-mark{border-left-color:var(--learning)}.stage.s-learn{border-left-color:#3a9bd6}.stage.s-done{border-left-color:var(--known)}
.heatmap{display:grid;grid-auto-flow:column;grid-template-rows:repeat(7,12px);gap:3px;overflow-x:auto}
.hc{width:12px;height:12px;border-radius:2px;background:#1b2027}
.hc.l1{background:#173a26}.hc.l2{background:#1f6b3f}.hc.l3{background:#2f9d5b}.hc.l4{background:var(--green)}
.empty{text-align:center;color:var(--mut);padding:48px}
@media(max-width:680px){.sidebar{width:64px}.sb-brand-txt,.sb-item span:not(.sb-ico),.sb-lang-sel{display:none}}