:root {
  --forest: #1f4d3d;
  --forest-dark: #163a2e;
  --cream: #f4ead5;
  --light-square: #eeead9;
  --dark-square: #7c9473;
  --accent: #c68a3f;
  --danger: #b3432b;
  --text: #222;
  --panel-bg: #ffffff;
  --page-bg: #f4f2ea;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--page-bg);
  color: var(--text);
  font-family: "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-tap-highlight-color: transparent;
}

body {
  padding-bottom: env(safe-area-inset-bottom);
}

.app-header {
  background: var(--forest);
  color: var(--cream);
  padding: 12px 16px calc(8px + env(safe-area-inset-top)) 16px;
  position: sticky;
  top: 0;
  z-index: 10;
}

.app-header h1 {
  margin: 0 0 10px 0;
  font-size: 1.3rem;
}

.tab-nav {
  display: flex;
  gap: 8px;
}

.tab-btn {
  flex: 1;
  background: rgba(255, 255, 255, 0.12);
  border: none;
  color: var(--cream);
  padding: 10px 6px;
  border-radius: 10px;
  font-size: 0.95rem;
  cursor: pointer;
}

.tab-btn.active {
  background: var(--cream);
  color: var(--forest-dark);
  font-weight: 600;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 16px;
}

.tab-view {
  display: none;
}

.tab-view.active {
  display: block;
}

.hidden {
  display: none !important;
}

.home-content {
  background: var(--panel-bg);
  border-radius: 14px;
  padding: 20px;
  line-height: 1.5;
}

.home-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.btn {
  border: none;
  border-radius: 10px;
  padding: 12px 18px;
  font-size: 1rem;
  background: #e6e2d3;
  color: var(--text);
  cursor: pointer;
}

.btn.primary {
  background: var(--forest);
  color: var(--cream);
}

.btn:disabled {
  opacity: 0.5;
  cursor: default;
}

.btn.active {
  background: var(--accent);
  color: white;
}

.btn-text {
  background: none;
  border: none;
  color: var(--forest);
  font-size: 0.95rem;
  cursor: pointer;
  padding: 4px 0;
}

/* --- Chessboard --- */

.board-wrapper {
  position: relative;
  width: 100%;
  max-width: 440px;
  margin: 0 auto;
  aspect-ratio: 1 / 1;
}

.board-svg {
  width: 100%;
  height: 100%;
  display: block;
  touch-action: manipulation;
  user-select: none;
}

.square.light {
  fill: var(--light-square);
}

.square.dark {
  fill: var(--dark-square);
}

.coord-label {
  font-size: 11px;
  font-family: inherit;
  pointer-events: none;
}

.coord-label.on-light {
  fill: var(--dark-square);
}

.coord-label.on-dark {
  fill: var(--light-square);
}

.piece {
  font-size: 42px;
  text-anchor: middle;
  cursor: pointer;
  pointer-events: none;
}

.white-piece {
  fill: #ffffff;
  stroke: #1a1a1a;
  stroke-width: 1.6px;
  paint-order: stroke fill;
}

.black-piece {
  fill: #202020;
  stroke: #fbf8f0;
  stroke-width: 0.6px;
  paint-order: stroke fill;
}

.highlight {
  pointer-events: none;
}

.highlight.selected {
  fill: rgba(198, 138, 63, 0.55);
}

.highlight.move-target {
  fill: rgba(31, 77, 61, 0.35);
}

.highlight.capture-target {
  fill: rgba(179, 67, 43, 0.4);
}

.highlight.last-move {
  fill: rgba(198, 138, 63, 0.28);
}

.highlight.hint {
  fill: rgba(31, 120, 180, 0.35);
}

/* Zugqualität im Coach-Modus */
.highlight.quality-best {
  fill: rgba(45, 165, 90, 0.65);
}

.highlight.quality-good {
  fill: rgba(140, 198, 120, 0.6);
}

.highlight.quality-inaccuracy {
  fill: rgba(198, 138, 63, 0.55);
}

.highlight.quality-mistake {
  fill: rgba(201, 104, 47, 0.6);
}

.highlight.quality-blunder {
  fill: rgba(179, 67, 43, 0.65);
}

.promotion-picker {
  position: absolute;
  display: flex;
  background: white;
  border-radius: 8px;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.35);
  overflow: hidden;
  z-index: 5;
}

.promotion-choice {
  border: none;
  background: var(--panel-bg);
  font-size: 28px;
  padding: 4px 8px;
  cursor: pointer;
  flex: 1;
}

.promotion-choice:hover {
  background: var(--light-square);
}

/* --- Lessons --- */

.lessons-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}


.chapter-card {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--panel-bg);
  border: none;
  border-radius: 12px;
  padding: 14px 16px;
  text-align: left;
  cursor: pointer;
  font-size: 1rem;
}

.chapter-index {
  background: var(--forest);
  color: var(--cream);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  flex-shrink: 0;
}

.chapter-info {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.chapter-title {
  font-weight: 600;
}

.chapter-meta {
  font-size: 0.8rem;
  color: #666;
}

.chapter-status {
  color: var(--forest);
  font-weight: 700;
  font-size: 1.1rem;
}

.lesson-runner-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.lesson-chapter-title {
  margin: 0;
  font-size: 1.1rem;
  flex: 1;
}

.lesson-step-dots {
  display: flex;
  gap: 5px;
}

.step-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #d5d0c0;
}

.step-dot.active {
  background: var(--accent);
}

.lesson-body {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.lesson-panel {
  background: var(--panel-bg);
  border-radius: 12px;
  padding: 16px;
}

.lesson-text p {
  margin: 0 0 10px 0;
  line-height: 1.5;
}

.lesson-feedback {
  min-height: 1.2em;
  font-weight: 600;
}

.lesson-feedback.success {
  color: var(--forest);
}

.lesson-feedback.error {
  color: var(--danger);
}

.lesson-nav {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-top: 10px;
}

/* --- Sparring --- */

.sparring-setup {
  background: var(--panel-bg);
  border-radius: 12px;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.setup-label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
}

.difficulty-buttons,
.color-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.sparring-game {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.sparring-panel {
  background: var(--panel-bg);
  border-radius: 12px;
  padding: 16px;
}

.sparring-status {
  font-weight: 600;
  min-height: 1.3em;
}

.notation-legend {
  background: var(--page-bg);
  border-radius: 8px;
  padding: 8px 12px;
  margin-top: 10px;
}

.notation-legend summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--forest);
}

.notation-legend-body {
  margin-top: 8px;
}

.notation-legend-body h5 {
  margin: 10px 0 4px 0;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: #777;
}

.notation-legend-body h5:first-child {
  margin-top: 0;
}

.notation-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.notation-list li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 0.88rem;
}

.notation-abbr {
  font-family: "Courier New", monospace;
  font-weight: 700;
  background: var(--panel-bg);
  border-radius: 5px;
  padding: 1px 7px;
  min-width: 34px;
  text-align: center;
  flex-shrink: 0;
}

.notation-name {
  color: var(--text);
}

.notation-hint {
  margin: 8px 0 0 0;
  font-size: 0.8rem;
  color: #777;
}

.move-history {
  max-height: 160px;
  overflow-y: auto;
  font-family: "Courier New", monospace;
  font-size: 0.9rem;
  background: var(--page-bg);
  border-radius: 8px;
  padding: 8px 10px;
  margin: 10px 0;
}

.history-row {
  display: grid;
  grid-template-columns: 32px 1fr 1fr;
  gap: 6px;
  padding: 2px 0;
}

.move-num {
  color: #888;
}

.sparring-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

/* --- Badges (geteilt von Coach-Legende & Meilensteinen) --- */

.quality-pill {
  font-size: 0.75rem;
  padding: 3px 9px;
  border-radius: 20px;
  background: #eee;
}

.pill-best { background: #dff3e3; color: #1f4d3d; }
.pill-good { background: #e8f3df; color: #3f7a4f; }
.pill-inaccuracy { background: #fbeed9; color: #8a5a1f; }
.pill-mistake { background: #fbe1d2; color: #a1481f; }
.pill-blunder { background: #f8d7d0; color: #8f2c17; }

/* --- Fortschritt & Meilensteine --- */

.progress-panel {
  background: var(--panel-bg);
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 18px;
}

.progress-panel h3 {
  margin: 0 0 10px 0;
  font-size: 1rem;
  color: var(--forest);
}

.milestone-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.milestone-item {
  display: flex;
  align-items: center;
  gap: 10px;
  opacity: 0.5;
}

.milestone-item.earned {
  opacity: 1;
}

.milestone-check {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #ddd;
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  flex-shrink: 0;
}

.milestone-item.earned .milestone-check {
  background: var(--forest);
}

.milestone-label {
  font-weight: 600;
  font-size: 0.9rem;
}

.milestone-desc {
  font-size: 0.8rem;
  color: #666;
}

.difficulty-choice.locked {
  opacity: 0.55;
  cursor: not-allowed;
}

.difficulty-lock-hint {
  font-size: 0.78rem;
  color: #666;
  margin-top: 6px;
}

/* --- Coach --- */

.coach-setup {
  background: var(--panel-bg);
  border-radius: 12px;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 16px;
}

.mode-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.engine-mode-options {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.coach-intro {
  background: var(--panel-bg);
  border-radius: 14px;
  padding: 16px;
  margin-bottom: 16px;
  line-height: 1.5;
}

.coach-intro p {
  margin: 0 0 10px 0;
}

.coach-quality-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 6px;
}

.coach-panel {
  background: var(--panel-bg);
  border-radius: 12px;
  padding: 16px;
  margin-top: 16px;
}

.coach-status {
  font-weight: 600;
  min-height: 1.3em;
  margin: 0 0 12px 0;
}

.coach-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.coach-tooltip {
  position: absolute;
  transform: translate(-50%, -100%);
  max-width: 220px;
  background: var(--forest-dark);
  color: var(--cream);
  font-size: 0.85rem;
  line-height: 1.4;
  padding: 8px 12px;
  border-radius: 8px;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.35);
  z-index: 6;
  pointer-events: none;
}

.coach-tooltip.below {
  transform: translate(-50%, 0);
}

@media (min-width: 700px) {
  .lesson-body {
    flex-direction: row;
    align-items: flex-start;
  }

  .lesson-board-slot {
    flex: 0 0 440px;
  }

  .lesson-panel {
    flex: 1;
  }

  .sparring-game {
    flex-direction: row;
    align-items: flex-start;
  }

  .sparring-board-slot {
    flex: 0 0 440px;
  }

  .sparring-panel {
    flex: 1;
  }
}