/* ==========================================================================
   Stats View — Statistik & Fortschritt, token-only, mobile-first
   ========================================================================== */

@keyframes stats-fade-in {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* --------------------------------------------------------------------------
   View-Container + Header
   -------------------------------------------------------------------------- */

.view--stats {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  animation: stats-fade-in 300ms ease-out;
}

.stats__header {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

.stats__title {
  margin: 0;
  font-size: 1.65rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-text);
}

.stats__lead {
  margin: 0;
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.55;
  max-width: 60ch;
}

.stats__skeleton {
  padding: 3rem 1.25rem;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

/* --------------------------------------------------------------------------
   Summary-Grid (Karten): 1 Spalte mobil, 3 Spalten Desktop
   -------------------------------------------------------------------------- */

.stats,
.stats__summary {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 720px) {
  .stats,
  .stats__summary {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
  }
}

/* Sektionen über die volle Breite */
.stats__section,
.stats__breakdown,
.stats__activity,
.stats__actions {
  grid-column: 1 / -1;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
}

.stats__section-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin: 0 0 1rem;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* --------------------------------------------------------------------------
   Karten — große Zahl + Label + Sublabel + Ring drumherum
   -------------------------------------------------------------------------- */

.stats__card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: transform 200ms ease, box-shadow 200ms ease, border-color 200ms ease;
}

.stats__card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-border-hover);
}

.stats__card-head {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.stats__card-title {
  margin: 0;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}

.stats__card-subtitle {
  margin: 0;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.4;
}

.stats__card-body {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.85rem;
}

.stats__card-foot {
  border-top: 1px solid var(--color-border);
  padding-top: 0.6rem;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  line-height: 1.45;
}

.stats__hint {
  color: var(--color-text-muted);
  font-size: 0.8rem;
}

/* Legacy big-number Stil (falls noch verwendet) */
.stats__card-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  margin: 0;
}

.stats__card-number {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.05;
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}

.stats__card-number-unit {
  font-size: 1.25rem;
  font-weight: 600;
  opacity: 0.7;
  margin-left: 0.15rem;
}

.stats__card-subtext {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin: 0;
  line-height: 1.45;
}

.stats__card-trend {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.8rem;
  font-weight: 700;
  margin-top: 0.25rem;
}

.stats__card-trend--up   { color: var(--color-success); }
.stats__card-trend--down { color: var(--color-danger); }

/* Akzent-Karten (nur über Token-Farben) */
.stats__card--accent {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-contrast);
}
.stats__card--accent .stats__card-title,
.stats__card--accent .stats__card-subtitle,
.stats__card--accent .stats__card-subtext,
.stats__card--accent .stats__card-label,
.stats__card--accent .stats__card-number {
  color: var(--color-primary-contrast);
}

.stats__card--success {
  background: var(--color-success);
  border-color: var(--color-success);
  color: var(--color-on-accent);
}
.stats__card--success .stats__card-title,
.stats__card--success .stats__card-subtitle,
.stats__card--success .stats__card-subtext,
.stats__card--success .stats__card-label,
.stats__card--success .stats__card-number {
  color: var(--color-on-accent);
}

.stats__card--warning {
  background: var(--color-warning);
  border-color: var(--color-warning);
  color: var(--color-on-accent);
}
.stats__card--warning .stats__card-title,
.stats__card--warning .stats__card-subtitle,
.stats__card--warning .stats__card-subtext,
.stats__card--warning .stats__card-label,
.stats__card--warning .stats__card-number {
  color: var(--color-on-accent);
}

/* --------------------------------------------------------------------------
   Chart — Donut/Ring (SVG-Variante aus JS: stats__chart--ring)
   -------------------------------------------------------------------------- */

.stats__chart {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  color: var(--color-primary);
}

.stats__chart--ring {
  position: relative;
  width: 100%;
  max-width: 140px;
}

.stats__chart--ring svg {
  width: 100%;
  height: auto;
  display: block;
}

.stats__chart-track {
  color: var(--color-surface-muted);
}

.stats__chart-fill {
  color: var(--color-primary);
  transition: stroke-dashoffset 600ms cubic-bezier(0.4, 0, 0.2, 1);
}

.stats__chart-text {
  fill: var(--color-text);
  font-size: 1.45rem;
  font-weight: 700;
  font-family: inherit;
  font-variant-numeric: tabular-nums;
  transform: none;
}

.stats__chart-caption {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  text-align: center;
  font-variant-numeric: tabular-nums;
}

@media (min-width: 720px) {
  .stats__chart {
    flex-direction: row;
    justify-content: center;
    gap: 1.5rem;
  }
  .stats__chart--ring {
    flex-direction: column;
  }
}

/* Legacy Donut (für eventuelle andere Renderings) */
.stats__chart-donut {
  position: relative;
  width: 180px;
  height: 180px;
  flex-shrink: 0;
}

.stats__chart-donut svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.stats__chart-donut-track {
  fill: none;
  stroke: var(--color-surface-muted);
  stroke-width: 14;
}

.stats__chart-donut-fill {
  fill: none;
  stroke: var(--color-primary);
  stroke-width: 14;
  stroke-linecap: round;
  transition: stroke-dashoffset 600ms cubic-bezier(0.4, 0, 0.2, 1);
}

.stats__chart-donut-fill--success { stroke: var(--color-success); }
.stats__chart-donut-fill--warning { stroke: var(--color-warning); }
.stats__chart-donut-fill--danger  { stroke: var(--color-danger); }

.stats__chart-donut-center {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.stats__chart-donut-value {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
}

.stats__chart-donut-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.stats__chart-legend {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  min-width: 160px;
}

.stats__chart-legend-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--color-text);
}

.stats__chart-legend-dot {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  flex-shrink: 0;
  background: var(--color-primary);
}

.stats__chart-legend-dot--success { background: var(--color-success); }
.stats__chart-legend-dot--warning { background: var(--color-warning); }
.stats__chart-legend-dot--danger  { background: var(--color-danger); }
.stats__chart-legend-dot--neutral { background: var(--color-text-muted); }

.stats__chart-legend-value {
  margin-left: auto;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--color-text);
}

/* Balkengraph (Alternative) */
.stats__chart-bars {
  display: flex;
  align-items: flex-end;
  gap: 0.5rem;
  height: 160px;
  padding: 0.5rem 0;
  width: 100%;
}

.stats__chart-bar {
  flex: 1;
  background: var(--color-primary);
  border-radius: 6px 6px 0 0;
  min-height: 4px;
  position: relative;
  transition: height 600ms cubic-bezier(0.4, 0, 0.2, 1);
}

.stats__chart-bar-label {
  position: absolute;
  bottom: -1.5rem;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  white-space: nowrap;
}

.stats__chart-bar-value {
  position: absolute;
  top: -1.25rem;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
}

/* --------------------------------------------------------------------------
   Breakdown / Subject-Rows — Name + Progress + Prozent
   -------------------------------------------------------------------------- */

.stats__breakdown-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

@media (min-width: 720px) {
  .stats__breakdown-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.stats__breakdown-col {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.stats__breakdown-col-title {
  margin: 0;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.stats__breakdown-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.stats__breakdown-row {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 0.75rem 0.85rem;
  background: var(--color-surface-hover);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  transition: border-color 150ms ease, background 150ms ease;
}

.stats__breakdown-row:hover {
  border-color: var(--color-border-hover);
}

.stats__breakdown-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.stats__breakdown-name {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--color-text);
}

.stats__breakdown-meta {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
}

/* Legacy stats__subjects */
.stats__subjects {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.stats__subject-row {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "name pct"
    "bar  bar";
  gap: 0.35rem 0.75rem;
  align-items: center;
}

@media (min-width: 560px) {
  .stats__subject-row {
    grid-template-columns: minmax(140px, 1fr) 2fr auto;
    grid-template-areas: "name bar pct";
    gap: 0.85rem;
  }
}

.stats__subject-name {
  grid-area: name;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.stats__subject-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  color: var(--color-text-muted);
}

.stats__subject-bar {
  grid-area: bar;
  position: relative;
  height: 10px;
  background: var(--color-surface-muted);
  border-radius: 999px;
  overflow: hidden;
}

.stats__subject-bar-fill {
  position: absolute;
  inset: 0;
  width: var(--progress, 0%);
  background: var(--color-primary);
  border-radius: 999px;
  transition: width 600ms cubic-bezier(0.4, 0, 0.2, 1);
}

.stats__subject-bar-fill--low  { background: var(--color-danger); }
.stats__subject-bar-fill--mid  { background: var(--color-warning); }
.stats__subject-bar-fill--high { background: var(--color-success); }

.stats__subject-pct {
  grid-area: pct;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
  min-width: 3rem;
  text-align: right;
}

/* --------------------------------------------------------------------------
   Activity — Icon + Text + Zeit, dezent getrennt
   -------------------------------------------------------------------------- */

.stats__activity-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.stats__activity-row,
.stats__activity-item {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  padding: 0.75rem 0.25rem;
  border-bottom: 1px solid var(--color-border);
  transition: background 150ms ease;
}

.stats__activity-row:last-child,
.stats__activity-item:last-child {
  border-bottom: 0;
}

.stats__activity-row:hover,
.stats__activity-item:hover {
  background: var(--color-surface-hover);
}

.stats__activity-icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-info-bg);
  color: var(--color-info-text);
  border: 1px solid var(--color-info-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

.stats__activity-row[data-kind="read"] .stats__activity-icon {
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.stats__activity-row[data-kind="srs"] .stats__activity-icon {
  background: var(--color-success-bg);
  color: var(--color-success-text);
  border-color: var(--color-success-border);
}

.stats__activity-row[data-kind="answer"] .stats__activity-icon {
  background: var(--color-warning-bg);
  color: var(--color-warning-text);
  border-color: var(--color-warning-border);
}

.stats__activity-icon--success {
  background: var(--color-success-bg);
  color: var(--color-success-text);
  border-color: var(--color-success-border);
}

.stats__activity-icon--warning {
  background: var(--color-warning-bg);
  color: var(--color-warning-text);
  border-color: var(--color-warning-border);
}

.stats__activity-icon--danger {
  background: var(--color-danger-bg);
  color: var(--color-danger-text);
  border-color: var(--color-danger-border);
}

.stats__activity-body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.stats__activity-title {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.35;
}

.stats__activity-detail {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  line-height: 1.4;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.stats__activity-text {
  font-size: 0.9rem;
  color: var(--color-text);
  margin: 0;
  line-height: 1.4;
}

.stats__activity-text strong {
  color: var(--color-text);
  font-weight: 700;
}

.stats__activity-time {
  flex-shrink: 0;
  font-size: 0.75rem;
  color: var(--color-text-placeholder);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  padding-top: 0.1rem;
}

.stats__activity-time time {
  display: inline-block;
}

.stats__activity-empty {
  text-align: center;
  padding: 2rem 1rem;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

/* --------------------------------------------------------------------------
   Actions — Export / Reset, klar getrennt, Reset als danger
   -------------------------------------------------------------------------- */

.stats__actions {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.stats__actions-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: space-between;
  align-items: center;
}

.stats__actions-row .btn--primary,
.stats__actions-row [data-action="export"] {
  margin-right: auto;
}

.stats__actions-row .btn--danger,
.stats__actions-row [data-action="reset"] {
  margin-left: auto;
}

.stats__actions-hint {
  margin: 0;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  max-width: 60ch;
}

.stats__actions-btn {
  flex: 0 1 auto;
  min-width: 160px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 6px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  transition: background 150ms ease, border-color 150ms ease, color 150ms ease, transform 150ms ease;
  font-family: inherit;
}

.stats__actions-btn:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-border-hover);
}

.stats__actions-btn:active {
  transform: translateY(1px);
}

.stats__actions-btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--color-focus-ring);
}

.stats__actions-btn--primary {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-contrast);
}

.stats__actions-btn--primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}

.stats__actions-btn--danger {
  background: var(--color-surface);
  border-color: var(--color-danger-border);
  color: var(--color-danger);
}

.stats__actions-btn--danger:hover {
  background: var(--color-danger-bg);
  border-color: var(--color-danger);
  color: var(--color-danger-hover);
}

.stats__actions-btn[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.stats__actions-btn-icon {
  width: 16px;
  height: 16px;
}

/* --------------------------------------------------------------------------
   Empty-State
   -------------------------------------------------------------------------- */

.stats__empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: 2.5rem 1.5rem;
  color: var(--color-text-muted);
}

.stats__empty-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 0 0 0.5rem;
}

.stats__empty-text {
  font-size: 0.9rem;
  margin: 0;
  line-height: 1.55;
}

/* --------------------------------------------------------------------------
   Mobile
   -------------------------------------------------------------------------- */

@media (max-width: 560px) {
  .view--stats {
    padding: 0.75rem;
  }

  .stats__section,
  .stats__breakdown,
  .stats__activity,
  .stats__actions {
    padding: 1rem;
    border-radius: 8px;
  }

  .stats__title {
    font-size: 1.4rem;
  }

  .stats__activity-detail {
    white-space: normal;
  }
}

/* --------------------------------------------------------------------------
   Reduced Motion
   -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  .view--stats,
  .stats__card,
  .stats__chart-fill,
  .stats__chart-donut-fill,
  .stats__chart-bar,
  .stats__subject-bar-fill,
  .stats__actions-btn,
  .stats__activity-row,
  .stats__activity-item,
  .stats__breakdown-row {
    transition: none;
    animation: none;
  }
}