:root{
  --tool-card-bg: #ffffff;
  --tool-soft: rgba(234,242,255,.65);
  --tool-ring: rgba(29,111,255,.22);
}

.tool-grid{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

@media (max-width: 980px){
  .tool-grid{ grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 620px){
  .tool-grid{ grid-template-columns: 1fr; }
}

.tool-card{
  position: relative;
  overflow: hidden;
  transform: translateZ(0);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}

.tool-card:hover{
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  border-color: rgba(29,111,255,.18);
}

.tool-card .tool-card-top{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.tool-pill{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 999px;
  background: var(--tool-soft);
  border: 1px solid rgba(29,111,255,.18);
  color: rgba(15,91,214,.95);
  font-weight: 800;
  font-size: 12px;
}

.tool-form{
  display: grid;
  gap: 12px;
}

.tool-row{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

@media (max-width: 760px){
  .tool-row{ grid-template-columns: 1fr; }
}

.tool-field{
  display: grid;
  gap: 6px;
}

.tool-label{
  font-size: 12px;
  font-weight: 800;
  color: rgba(11,18,32,.78);
}

.tool-help{
  font-size: 12px;
  color: rgba(11,18,32,.56);
  line-height: 1.55;
}

.tool-input,
.tool-select,
.tool-textarea{
  width: 100%;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px 12px;
  font: inherit;
  transition: border-color .14s ease, box-shadow .14s ease;
}

.tool-textarea{ min-height: 140px; resize: vertical; }

.tool-input:focus,
.tool-select:focus,
.tool-textarea:focus{
  outline: none;
  border-color: rgba(29,111,255,.55);
  box-shadow: 0 0 0 4px rgba(29,111,255,.10);
}

.tool-switch{
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: #fff;
  user-select: none;
}

.tool-switch input{ width: 18px; height: 18px; }

.tool-actions{
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

.tool-divider{
  height: 1px;
  background: var(--border);
  margin: 18px 0;
}

.tool-panel{
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: 0 12px 28px rgba(13,60,135,.06);
  padding: 18px;
}

.tool-stat-row{
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

@media (max-width: 760px){
  .tool-stat-row{ grid-template-columns: repeat(2, 1fr); }
}

.tool-stat{
  border: 1px solid var(--border);
  background: rgba(234,242,255,.35);
  border-radius: 16px;
  padding: 12px;
}

.tool-stat .tool-stat-label{
  font-size: 12px;
  font-weight: 800;
  color: rgba(11,18,32,.62);
}

.tool-stat .tool-stat-value{
  margin-top: 6px;
  font-size: 18px;
  font-weight: 900;
  letter-spacing: -0.02em;
}

.tool-modal{
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: rgba(11,18,32,.45);
  backdrop-filter: blur(6px);
  z-index: 80;
  opacity: 0;
  transition: opacity .18s ease;
}

.tool-modal.is-open{
  display: flex;
  opacity: 1;
}

.tool-modal-card{
  width: min(980px, 100%);
  background: #fff;
  border: 1px solid rgba(255,255,255,.55);
  border-radius: 26px;
  box-shadow: var(--shadow);
  overflow: hidden;
  transform: translateY(10px);
  transition: transform .18s ease;
}

.tool-modal.is-open .tool-modal-card{ transform: translateY(0); }

.tool-modal-head{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(234,242,255,.85), rgba(234,242,255,.35));
}

.tool-modal-title{
  margin: 0;
  font-size: 14px;
  font-weight: 900;
  letter-spacing: -0.02em;
}

.tool-modal-body{ padding: 16px; }

.flashcard{
  display: grid;
  place-items: center;
  border-radius: 22px;
  border: 1px solid var(--border);
  background: radial-gradient(1200px 600px at 20% 0%, rgba(29,111,255,.10), transparent 60%), #fff;
  min-height: 320px;
  padding: 26px;
  text-align: center;
}

.flashcard-clickable{
  cursor: pointer;
  transition: transform .14s ease, box-shadow .14s ease, border-color .14s ease;
}

.flashcard-clickable:hover{
  transform: translateY(-1px);
  box-shadow: 0 16px 36px rgba(13,60,135,.10);
  border-color: rgba(29,111,255,.22);
}

.flashcard-clickable:active{ transform: translateY(0); }

.flashcard-break{
  background: radial-gradient(1200px 600px at 20% 0%, rgba(29,111,255,.06), transparent 60%), #fff;
}

.flashcard-text{
  font-size: clamp(18px, 3.2vw, 34px);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.18;
  white-space: pre-wrap;
}

.flashcard-sub{
  margin-top: 12px;
  font-size: 13px;
  color: rgba(11,18,32,.56);
  font-weight: 700;
}

.progress-ring{
  width: 170px;
  height: 170px;
  display: grid;
  place-items: center;
  margin: 0 auto;
}

.progress-ring svg{ width: 170px; height: 170px; transform: rotate(-90deg); }

.progress-ring .ring-bg{ stroke: rgba(29,111,255,.12); }

.progress-ring .ring-fg{ stroke: var(--blue); transition: stroke-dashoffset .25s linear; }

.progress-ring-center{
  position: absolute;
  display: grid;
  place-items: center;
  text-align: center;
}

.progress-ring-time{
  font-size: 34px;
  font-weight: 900;
  letter-spacing: -0.03em;
}

.progress-ring-label{
  margin-top: 2px;
  font-size: 12px;
  color: rgba(11,18,32,.56);
  font-weight: 800;
}

.btn-good{
  background: rgba(16,185,129,.12);
  border-color: rgba(16,185,129,.25);
  color: rgba(5,150,105,.98);
}

.btn-good:hover{
  background: rgba(16,185,129,.16);
}

.btn-bad{
  background: rgba(239,68,68,.10);
  border-color: rgba(239,68,68,.22);
  color: rgba(220,38,38,.98);
}

.btn-bad:hover{
  background: rgba(239,68,68,.14);
}

.checklist-item{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 12px;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: #fff;
  transition: transform .14s ease, box-shadow .14s ease, border-color .14s ease;
}

.checklist-item:hover{
  transform: translateY(-1px);
  border-color: rgba(29,111,255,.22);
  box-shadow: 0 12px 22px rgba(13,60,135,.06);
}

.check{
  width: 22px;
  height: 22px;
  border-radius: 8px;
  border: 1px solid rgba(11,18,32,.16);
  background: #fff;
  display: grid;
  place-items: center;
  transition: background .14s ease, border-color .14s ease, transform .14s ease;
}

.check svg{
  width: 14px;
  height: 14px;
  opacity: 0;
  transform: scale(.85);
  transition: opacity .14s ease, transform .14s ease;
}

.check.is-checked{
  background: rgba(29,111,255,.12);
  border-color: rgba(29,111,255,.35);
}

.check.is-checked svg{
  opacity: 1;
  transform: scale(1);
}