/* Vocab Trainer Pro - light, friendly UI */

.vtpro-wrap{
  --bg:#f6f8fc;
  --card: rgba(255,255,255,.78);
  --card2:#ffffff;
  --muted:#64748b;
  --text:#0f172a;
  --border:#e5e7eb;
  --shadow: 0 12px 32px rgba(15, 23, 42, .10);
  --shadow2: 0 8px 18px rgba(15, 23, 42, .06);
  --primary:#0ea5e9;
  --blue:#3b82f6;
  --ok:#22c55e;
  --danger:#fb7185;

  background: radial-gradient(900px 520px at 18% 10%, rgba(14,165,233,.12), transparent 55%),
              radial-gradient(900px 520px at 80% 18%, rgba(34,197,94,.10), transparent 60%),
              var(--bg);
  padding: 18px;
  border-radius: 18px;
}

.vtpro-shell{
  display:flex;
  gap:16px;
  min-height: 70vh;
}

.vtpro-side{
  width: 340px;
  max-width: 96vw;
  background: var(--card);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow);
  padding: 14px;
  display:flex;
  flex-direction:column;
  gap:12px;
}

.vtpro-main{ flex:1; min-width:0; display:flex; flex-direction:column; gap:16px; }

.vtpro-brand .vtpro-title{ font-size:18px; font-weight:900; color:var(--text); }
.vtpro-brand .vtpro-sub{ font-size:13px; color:var(--muted); margin-top:4px; }

.vtpro-block{ background: var(--card2); border:1px solid var(--border); border-radius: 16px; padding:12px; box-shadow: var(--shadow2); }
.vtpro-label{ font-size:12px; font-weight:800; color:var(--muted); text-transform:uppercase; letter-spacing:.4px; margin-bottom:8px; }
.vtpro-mini{ font-size:12px; color:var(--muted); margin-bottom:6px; }
.vtpro-hint{ font-size:12px; color:var(--muted); margin-top:8px; line-height:1.4; }

.vtpro-input{
  width:100%;
  border: 1px solid var(--border);
  background: #fff;
  padding: 10px 12px;
  border-radius: 12px;
  outline: none;
  color: var(--text);
}
.vtpro-input:focus{ border-color: rgba(14,165,233,.35); box-shadow: 0 0 0 4px rgba(14,165,233,.10); }

.vtpro-group-list{ max-height: 38vh; overflow:auto; padding-right:4px; }
.vtpro-group-item{
  width:100%;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:10px;
  padding:10px 10px;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: #fff;
  cursor:pointer;
  transition: transform .06s ease, background .12s ease, border-color .12s ease;
  margin-bottom:10px;
}
.vtpro-group-item:hover{ background:#f8fafc; }
.vtpro-group-item:active{ transform: translateY(1px); }
.vtpro-group-item.active{ border-color: rgba(14,165,233,.55); background: rgba(14,165,233,.08); }
.vtpro-group-item.locked{ opacity:.75; }
.vtpro-group-name{ font-weight:900; font-size:13px; color:var(--text); display:flex; align-items:center; gap:8px; }
.vtpro-lock{ display:inline-block; font-size:12px; padding:2px 8px; border-radius:999px; border:1px solid rgba(251,113,133,.35); background: rgba(251,113,133,.10); color:#9f1239; }
.vtpro-group-sub{ font-size:12px; color:var(--muted); margin-top:4px; }
.vtpro-badge, .vtpro-pill{
  border:1px solid var(--border);
  background:#fff;
  padding:6px 10px;
  border-radius: 999px;
  font-size:12px;
  color: var(--muted);
  white-space:nowrap;
}
.vtpro-pill b{ color: var(--text); }

.vtpro-top{
  background: var(--card);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow);
  padding: 14px;
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:12px;
  flex-wrap:wrap;
}
.vtpro-h1{ font-size:18px; font-weight:950; color:var(--text); }
.vtpro-pills{ display:flex; flex-wrap:wrap; gap:8px; align-items:center; }

.vtpro-btn{
  border:1px solid var(--border);
  background:#fff;
  color:var(--text);
  padding: 9px 12px;
  border-radius: 12px;
  font-weight:900;
  font-size:13px;
  cursor:pointer;
  transition: transform .06s ease, background .12s ease;
  text-decoration:none;
  display:inline-flex;
  align-items:center;
  justify-content:center;
}
.vtpro-btn:hover{ background:#f8fafc; }
.vtpro-btn:active{ transform: translateY(1px); }
.vtpro-primary{ border-color: rgba(14,165,233,.35); background: rgba(14,165,233,.10); }
.vtpro-blue{ border-color: rgba(59,130,246,.30); background: rgba(59,130,246,.08); }
.vtpro-danger{ border-color: rgba(251,113,133,.35); background: rgba(251,113,133,.12); }

.vtpro-content{ display:grid; grid-template-columns: 1.35fr .85fr; gap:16px; align-items:start; }
.vtpro-panel{
  background: var(--card);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow);
  padding: 14px;
  min-width:0;
}
.vtpro-hr{ height:1px; background: var(--border); margin: 12px 0; }
.vtpro-row{ display:flex; gap:10px; flex-wrap:wrap; align-items:center; }
.vtpro-row-between{ justify-content:space-between; }
.vtpro-grid2{ display:grid; grid-template-columns:1fr 1fr; gap:12px; margin-top:10px; }
.vtpro-day{ max-width: 180px; }
.vtpro-miniSelect{ max-width: 220px; }
.vtpro-target{ width: 90px; }

.vtpro-cards{ display:flex; flex-direction:column; gap:12px; max-height: calc(100vh - 240px); overflow:auto; padding-right:4px; }
.vtpro-card{
  background:#fff;
  border:1px solid var(--border);
  border-radius: 18px;
  padding: 12px;
  box-shadow: var(--shadow2);
}
.vtpro-card-top{ display:flex; justify-content:space-between; gap:10px; }
.vtpro-word{ font-size:16px; font-weight:950; color:var(--text); }
.vtpro-meta{ font-size:12px; color:var(--muted); margin-top:4px; display:flex; gap:8px; flex-wrap:wrap; }
.vtpro-chip{ font-size:12px; padding:2px 8px; border-radius:999px; border:1px solid var(--border); background:#fff; color:var(--muted); }
.vtpro-chip.diff{ border-color: rgba(59,130,246,.22); background: rgba(59,130,246,.08); color:#1d4ed8; }

.vtpro-meaning{ font-size:13px; color:var(--text); margin-top:10px; line-height:1.45; }
.vtpro-sentence{
  font-size:13px;
  color:var(--muted);
  margin-top:10px;
  border-left: 3px solid rgba(34,197,94,.35);
  padding-left:10px;
  line-height:1.45;
}

.vtpro-toggle{
  border:1px solid var(--border);
  background:#fff;
  padding: 7px 10px;
  border-radius: 12px;
  font-size:12px;
  font-weight:950;
  cursor:pointer;
}
.vtpro-toggle.learned{ border-color: rgba(34,197,94,.35); background: rgba(34,197,94,.10); }
.vtpro-toggle.starred{ border-color: rgba(14,165,233,.35); background: rgba(14,165,233,.10); }

.vtpro-tags{ display:flex; flex-wrap:wrap; gap:8px; margin-top:10px; }
.vtpro-tag{ border:1px solid var(--border); background:#fff; padding:6px 10px; border-radius: 999px; font-size:12px; color:var(--muted); }

.vtpro-stat{
  display:flex; justify-content:space-between; align-items:center;
  gap:10px;
  background:#fff;
  border:1px solid var(--border);
  border-radius: 18px;
  padding: 12px;
  box-shadow: var(--shadow2);
  margin-top:12px;
}
.vtpro-stat-title{ font-weight:950; font-size:13px; color:var(--text); }
.vtpro-stat-sub{ font-size:12px; color:var(--muted); margin-top:4px; }
.vtpro-badge{ border:1px solid var(--border); background:#fff; padding:6px 10px; border-radius:999px; font-size:12px; color:var(--muted); }

.vtpro-chart{
  background:#fff;
  border:1px solid var(--border);
  border-radius: 18px;
  padding: 12px;
  box-shadow: var(--shadow2);
}
.vtpro-chart canvas{ width:100%; height:auto; display:block; }

.vtpro-modal-back{
  position:fixed;
  inset:0;
  background: rgba(15,23,42,.45);
  display:flex;
  align-items:center;
  justify-content:center;
  padding: 14px;
  z-index:9999;
}
.vtpro-modal{
  width:min(860px, 96vw);
  max-height: 90vh;
  overflow:auto;
  background:#fff;
  border:1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow);
  padding: 14px;
}
.vtpro-modal-head{ display:flex; justify-content:space-between; gap:10px; flex-wrap:wrap; align-items:flex-start; }
.vtpro-h2{ font-size:16px; font-weight:950; color:var(--text); }

.vtpro-question{
  margin-top:12px;
  background:#fff;
  border:1px solid var(--border);
  border-radius: 18px;
  padding: 12px;
  box-shadow: var(--shadow2);
}
.vtpro-q-title{ font-weight:950; font-size:14px; color:var(--text); white-space:pre-wrap; }
.vtpro-options{ display:grid; gap:10px; margin-top:12px; }
.vtpro-opt{
  border:1px solid var(--border);
  border-radius: 18px;
  padding: 10px;
  background:#fff;
  cursor:pointer;
}
.vtpro-opt:hover{ background:#f8fafc; }
.vtpro-opt.selected{ border-color: rgba(14,165,233,.55); background: rgba(14,165,233,.10); }
.vtpro-opt.correct{ border-color: rgba(34,197,94,.55); background: rgba(34,197,94,.12); }
.vtpro-opt.wrong{ border-color: rgba(251,113,133,.55); background: rgba(251,113,133,.12); }

.vtpro-toast{
  position:fixed;
  right:16px;
  bottom:16px;
  background:#fff;
  border:1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 10px 12px;
  color: var(--text);
  font-weight:800;
  z-index:10000;
}

.vtpro-lock-back{
  position:fixed;
  inset:0;
  background: rgba(15,23,42,.40);
  display:flex;
  align-items:center;
  justify-content:center;
  padding:14px;
  z-index:10001;
}
.vtpro-lock{
  width:min(520px, 96vw);
  background:#fff;
  border:1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow);
  padding: 14px;
}

@media (max-width: 980px){
  .vtpro-shell{ flex-direction:column; }
  .vtpro-side{ width:100%; }
  .vtpro-content{ grid-template-columns: 1fr; }
  .vtpro-cards{ max-height: unset; }
}