:root {
  color-scheme: light;
  --bg: #f6f7f4;
  --surface: #ffffff;
  --text: #1f2520;
  --muted: #657065;
  --line: #d8ddd5;
  --accent: #2f6f4e;
  --accent-strong: #24583d;
  --danger: #9b2f2f;
  --warn: #8a6500;
  --good: #1f6b43;
  --light-square: #edf0df;
  --dark-square: #6f8b5f;
  --selected: #f7d44a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 18% -10%, rgba(47, 111, 78, 0.13), transparent 34rem),
    linear-gradient(180deg, #fbfcf8 0, var(--bg) 18rem);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

button,
input,
select,
textarea {
  font: inherit;
}

.header-link {
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 600;
}

button {
  border: 1px solid var(--accent);
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  padding: 0.6rem 0.9rem;
  cursor: pointer;
}

button:hover:not(:disabled) {
  background: var(--accent-strong);
}

button.secondary {
  border-color: var(--line);
  background: var(--surface);
  color: var(--text);
}

button.secondary:hover:not(:disabled) {
  border-color: var(--accent);
  background: #e7ece3;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem clamp(1rem, 3vw, 2rem);
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 8px 24px rgba(31, 37, 32, 0.06);
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: 1.45rem;
}

h2 {
  font-size: 1.1rem;
}

#subtitle {
  margin-top: 0.2rem;
  color: var(--muted);
}

.top-controls {
  display: flex;
  align-items: end;
  gap: 0.8rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.rating-control,
.profile-control {
  display: grid;
  gap: 0.25rem;
  min-width: 190px;
}

.rating-control label,
.profile-control label {
  color: var(--muted);
  font-size: 0.86rem;
}

.rating-row,
.profile-row {
  display: flex;
  gap: 0.5rem;
}

.rating-row input,
.profile-row select {
  width: 110px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.55rem;
}

.profile-row select {
  width: 150px;
  background: #fff;
}

.auth-control {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  color: var(--muted);
  font-weight: 700;
}

.auth-panel {
  padding: 1rem clamp(1rem, 3vw, 2rem);
}

.auth-card {
  max-width: 880px;
  margin: 0 auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  padding: 1.2rem;
  box-shadow: 0 10px 28px rgba(31, 37, 32, 0.07);
}

.auth-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.auth-form {
  display: grid;
  gap: 0.55rem;
}

.auth-form h3 {
  margin: 0 0 0.25rem;
}

.auth-form input[type="text"],
.auth-form input[type="password"] {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.58rem 0.65rem;
}

.terms-row {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.auth-note,
.auth-feedback {
  color: var(--muted);
  font-size: 0.9rem;
}

.auth-feedback.bad {
  color: var(--danger);
}

.onboarding-panel {
  position: fixed;
  z-index: 60;
  inset: 0;
  overflow: auto;
  padding: clamp(0.8rem, 5vh, 2.5rem) 1rem;
  background: rgba(31, 37, 32, 0.46);
}

.onboarding-card {
  display: grid;
  gap: 1.1rem;
  width: min(760px, 100%);
  margin: 0 auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  padding: clamp(1rem, 3vw, 1.5rem);
  box-shadow: 0 16px 38px rgba(31, 37, 32, 0.2);
}

.onboarding-card h2,
.calibration-box h3 {
  margin: 0;
}

.tutorial-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.6rem;
}

.tutorial-step {
  display: grid;
  gap: 0.3rem;
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 0.7rem;
}

.tutorial-step span,
.calibration-box p {
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.4;
}

.calibration-box {
  display: grid;
  gap: 0.7rem;
  border-radius: 8px;
  background: #f1f4ee;
  padding: 0.85rem;
}

.calibration-box label {
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 600;
}

.calibration-box select {
  width: min(100%, 280px);
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  padding: 0.6rem;
}

.onboarding-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.calibration-summary {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  padding: 1rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.site-footer a {
  color: var(--accent-strong);
  font-weight: 700;
}

.legal-page {
  max-width: 760px;
  margin: 0 auto;
  padding: 2rem clamp(1rem, 4vw, 3rem);
  line-height: 1.6;
}

.legal-page h1,
.legal-page h2 {
  color: var(--text);
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 360px);
  gap: 1rem;
  padding: 1rem clamp(1rem, 3vw, 2rem);
  max-width: 1240px;
  margin: 0 auto;
}

.trainer,
.progress-panel {
  min-width: 0;
}

.session-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.7rem;
}

.session-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.curriculum-context {
  margin-top: 0.28rem;
  color: var(--accent-strong);
  font-size: 0.84rem;
  font-weight: 600;
}

.session-progress {
  height: 10px;
  overflow: hidden;
  border-radius: 999px;
  background: #e2e8dd;
  margin-bottom: 1rem;
}

.session-progress-bar {
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--accent);
  transition: width 180ms ease;
}

.warmup-setup {
  max-width: 700px;
  margin: 0 0 1rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  padding: 1rem;
  box-shadow: 0 10px 28px rgba(31, 37, 32, 0.07);
}

.warmup-heading {
  display: flex;
  gap: 0.75rem;
  align-items: start;
  justify-content: space-between;
}

.warmup-heading h3 {
  margin: 0.18rem 0 0;
}

.warmup-setup p {
  color: var(--muted);
  margin: 0.65rem 0 0.85rem;
}

.warmup-setup > label {
  display: block;
  color: var(--muted);
  font-size: 0.86rem;
  margin-bottom: 0.35rem;
}

.opening-search {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.58rem 0.65rem;
}

.selected-openings,
.opening-results {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.7rem 0;
}

.opening-results {
  min-height: 2.2rem;
  max-height: 170px;
  overflow-y: auto;
  align-content: start;
}

.opening-chip {
  border-color: var(--line);
  background: #f1f4ee;
  color: var(--text);
  padding: 0.38rem 0.58rem;
  font-size: 0.84rem;
}

.opening-chip.selected {
  border-color: var(--accent);
  background: #e2efe7;
  color: var(--accent-strong);
}

.muted {
  color: var(--muted);
  font-size: 0.9rem;
}

.eyebrow {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.board-and-panel {
  display: grid;
  grid-template-columns: minmax(0, 560px) minmax(260px, 320px);
  gap: 1rem;
  align-items: start;
}

.board-wrap {
  width: 100%;
  max-width: 560px;
  min-width: 0;
}

.turn-indicator {
  margin-bottom: 0.45rem;
  border: 2px solid #1c241a;
  border-radius: 6px;
  background: #f7f9f3;
  color: #1c241a;
  padding: 0.42rem 0.65rem;
  font-weight: 800;
  text-align: center;
}

.turn-indicator.black {
  background: #1c241a;
  color: #f7f9f3;
}

.board {
  width: 100%;
  aspect-ratio: 1;
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
  border: 5px solid #1c241a;
  border-radius: 6px;
  overflow: hidden;
  background: #1c241a;
  user-select: none;
}

.board.ready-board {
  display: grid;
  grid-template-columns: 1fr;
  grid-template-rows: 1fr;
  place-items: center;
  background: #e7ece3;
  cursor: pointer;
}

.board-start-message {
  max-width: 70%;
  color: #1c241a;
  font-size: 1.25rem;
  font-weight: 800;
  line-height: 1.35;
  text-align: center;
}

.board-start-message span {
  display: block;
  margin-top: 0.4rem;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 600;
}

.square {
  position: relative;
  display: grid;
  place-items: center;
  min-width: 0;
  min-height: 0;
  border: 0;
  border-radius: 0;
  padding: 0;
  font-size: clamp(1.7rem, 6vw, 3.8rem);
  line-height: 1;
  background: transparent;
  color: var(--text);
}

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

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

.square.selected {
  outline: 4px solid var(--selected);
  outline-offset: -4px;
}

.piece {
  display: block;
  transform: translateY(-0.02em);
  font-family: "Arial Unicode MS", "Segoe UI Symbol", serif;
  font-weight: 900;
  filter: drop-shadow(0 2px 1px rgba(20, 28, 18, 0.28));
}

.piece.white-piece {
  color: #fff3c4;
  text-shadow:
    0 2px 0 #1a2118,
    0 -1px 0 #1a2118,
    1px 0 0 #1a2118,
    -1px 0 0 #1a2118,
    1px 1px 0 #1a2118,
    -1px 1px 0 #1a2118,
    1px -1px 0 #1a2118,
    -1px -1px 0 #1a2118;
}

.piece.black-piece {
  color: #172015;
  text-shadow:
    0 2px 0 #f6efcf,
    0 -1px 0 #f6efcf,
    1px 0 0 #f6efcf,
    -1px 0 0 #f6efcf,
    1px 1px 0 #f6efcf,
    -1px 1px 0 #f6efcf,
    1px -1px 0 #f6efcf,
    -1px -1px 0 #f6efcf;
}

.square.last-move {
  box-shadow: inset 0 0 0 4px rgba(47, 111, 78, 0.35);
}

.side-panel,
.progress-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  padding: 1rem;
  box-shadow: 0 10px 28px rgba(31, 37, 32, 0.07);
}

.side-panel {
  display: grid;
  gap: 0.65rem;
  width: 100%;
  min-width: 0;
  overflow-anchor: none;
}

.metrics-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.4rem;
}

.metric {
  display: grid;
  gap: 0.1rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fbfcf8;
  padding: 0.42rem 0.48rem;
}

.metric span {
  color: var(--muted);
  font-size: 0.78rem;
}

.metric strong {
  font-size: 1.1rem;
}

.primary-action {
  width: 100%;
  min-height: 2.75rem;
  font-weight: 700;
}

.mobile-action-dock {
  display: none;
}

.feedback {
  min-height: 3rem;
  border-radius: 6px;
  background: #f1f4ee;
  border-left: 4px solid #c6d0bf;
  padding: 0.75rem;
  color: var(--text);
}

.feedback.good {
  color: var(--good);
  border-left-color: var(--good);
}

.feedback.bad {
  color: var(--danger);
  border-left-color: var(--danger);
}

.feedback.warn {
  color: var(--warn);
  border-left-color: var(--warn);
}

.sound-toggle {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.move-entry {
  display: grid;
  gap: 0.35rem;
}

.move-entry label {
  color: var(--muted);
  font-size: 0.86rem;
}

.move-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.45rem;
}

.move-row input {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.58rem 0.65rem;
  background: #fff;
  color: var(--text);
  font-weight: 700;
}

.move-row input:disabled {
  background: #f1f4ee;
  color: var(--muted);
}

.move-help {
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.3;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.tag {
  border-radius: 999px;
  background: #e7ece3;
  color: #364537;
  padding: 0.22rem 0.5rem;
  font-size: 0.78rem;
}

.promotion-control {
  display: grid;
  gap: 0.35rem;
}

.promotion-control > span {
  color: var(--muted);
  font-size: 0.86rem;
}

.promotion-choices {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.35rem;
}

.promotion-choices button {
  border-color: var(--line);
  background: #f1f4ee;
  color: var(--text);
  padding: 0.48rem 0;
  font-weight: 800;
}

.promotion-choices button[aria-pressed="true"] {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

.link {
  color: var(--accent-strong);
  font-weight: 700;
}

.notice {
  margin-bottom: 1rem;
  border: 1px solid #e0c36f;
  border-radius: 8px;
  background: #fff7dd;
  padding: 0.9rem;
}

.status-summary {
  margin: 0.5rem 0 1rem;
  color: var(--muted);
}

.practice-panel {
  margin-bottom: 1rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcf8;
  padding: 0.75rem;
}

.practice-panel h3,
.progress-title {
  margin: 0 0 0.6rem;
  font-size: 0.94rem;
}

.practice-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.35rem;
}

.practice-stat {
  display: grid;
  align-content: start;
  min-width: 0;
  border-radius: 6px;
  background: #f1f4ee;
  padding: 0.45rem;
}

.practice-stat span,
.practice-stat small {
  color: var(--muted);
  font-size: 0.7rem;
}

.practice-stat strong {
  font-size: 1.05rem;
}

.review-queue {
  margin-top: 0.65rem;
}

.review-queue-title {
  margin-bottom: 0.35rem;
  color: var(--muted);
  font-size: 0.73rem;
  font-weight: 700;
  text-transform: uppercase;
}

.review-queue-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.45rem;
  border-top: 1px solid var(--line);
  padding: 0.35rem 0;
  font-size: 0.78rem;
}

.review-queue-item strong {
  display: block;
}

.review-queue-item span {
  color: var(--muted);
}

.review-queue-empty {
  color: var(--muted);
  font-size: 0.78rem;
}

.progress-title {
  margin-top: 0.2rem;
}

.toggle-row {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 0.7rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.category-list {
  display: grid;
  gap: 0.45rem;
  max-height: 52vh;
  overflow: auto;
  padding-right: 0.2rem;
}

.filter-note {
  margin: 0.45rem 0 0.75rem;
  color: var(--muted);
  font-size: 0.82rem;
}

.category-row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.4rem;
  align-items: center;
  border-bottom: 1px solid var(--line);
  padding: 0.45rem 0;
}

.category-row.current {
  margin-left: -0.45rem;
  border-left: 3px solid var(--accent);
  border-radius: 4px;
  background: #edf4ee;
  padding-left: 0.35rem;
}

.category-toggle {
  width: 1rem;
  height: 1rem;
}

.category-row:last-child {
  border-bottom: 0;
}

.category-name {
  font-weight: 700;
}

.category-detail {
  color: var(--muted);
  font-size: 0.82rem;
}

.badge {
  border-radius: 999px;
  padding: 0.22rem 0.5rem;
  background: #e7ece3;
  color: #364537;
  font-size: 0.78rem;
  font-weight: 700;
}

.badge.master {
  background: #dff2e6;
  color: var(--good);
}

.badge.pass {
  background: #fff0bf;
  color: var(--warn);
}

.badge.fail {
  background: #f7dddd;
  color: var(--danger);
}

.review {
  margin-top: 1rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  padding: 1rem;
  box-shadow: 0 10px 28px rgba(31, 37, 32, 0.07);
  overflow-anchor: none;
}

.review-hero {
  display: grid;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.review-hero h2 {
  font-size: 1.35rem;
}

.coach-note,
.level-up-card {
  border-radius: 8px;
  padding: 0.8rem;
  background: #f1f4ee;
  color: var(--text);
}

.level-up-card {
  border: 1px solid #c4d9c7;
  background: linear-gradient(135deg, #e8f5e8, #fff8dc);
}

.level-up-card strong {
  display: block;
  margin-bottom: 0.25rem;
  color: var(--good);
}

.review-summary {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.55rem;
}

.stat-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcf8;
  padding: 0.7rem;
}

.stat-card span {
  display: block;
  color: var(--muted);
  font-size: 0.78rem;
}

.stat-card strong {
  display: block;
  margin-top: 0.12rem;
  font-size: 1.25rem;
}

.review-grid {
  display: grid;
  gap: 0.6rem;
  margin-top: 0.8rem;
}

.review-item {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.7rem;
}

.review-item.ok {
  opacity: 0.72;
}

.review-title {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  font-weight: 700;
}

.review-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.45rem;
}

.hidden {
  display: none !important;
}

@media (min-width: 901px) {
  .side-panel {
    position: sticky;
    top: 0.75rem;
  }
}

@media (max-width: 1180px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .progress-panel {
    order: 0;
  }
}

@media (max-width: 900px) {
  .board-and-panel {
    grid-template-columns: 1fr;
  }

  .board-wrap,
  .side-panel {
    max-width: 560px;
  }

  .review-summary {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  body.mobile-dock-active {
    padding-bottom: calc(4.7rem + env(safe-area-inset-bottom));
  }

  .topbar,
  .session-header {
    align-items: stretch;
    flex-direction: column;
  }

  .topbar {
    gap: 0.65rem;
    padding: 0.65rem;
  }

  h1 {
    font-size: 1.22rem;
  }

  #subtitle {
    display: none;
  }

  .layout {
    gap: 0.65rem;
    padding: 0.55rem;
  }

  .rating-control {
    min-width: 0;
  }

  .top-controls {
    display: grid;
    grid-template-columns: 1fr;
    align-items: end;
    gap: 0.55rem;
    justify-content: stretch;
  }

  .rating-control,
  .profile-control {
    display: grid;
    grid-template-columns: 4.6rem minmax(0, 1fr) auto;
    align-items: center;
    gap: 0.45rem;
    min-width: 0;
  }

  .rating-row input {
    min-width: 0;
    width: auto;
    max-width: none;
  }

  .profile-row select {
    min-width: 0;
    width: auto;
    max-width: none;
  }

  .rating-row,
  .profile-row {
    display: contents;
  }

  .rating-row button,
  .profile-row button {
    width: auto;
    padding-inline: 0.75rem;
  }

  .auth-control {
    justify-content: flex-start;
    font-size: 0.86rem;
  }

  body.training-running .topbar {
    display: none;
  }

  .session-header {
    gap: 0.5rem;
    margin-bottom: 0.5rem;
  }

  .session-actions {
    flex-wrap: wrap;
  }

  .session-progress {
    margin-bottom: 0.6rem;
  }

  .board-and-panel {
    gap: 0.6rem;
  }

  .turn-indicator {
    margin-bottom: 0.28rem;
    padding: 0.35rem 0.55rem;
  }

  .board {
    border-width: 3px;
  }

  .square {
    font-size: clamp(2.05rem, 11vw, 2.9rem);
    touch-action: manipulation;
  }

  .piece.black-piece.piece-pawn {
    font-size: 0.84em;
    transform: translateY(0.05em);
  }

  button {
    min-height: 2.7rem;
    touch-action: manipulation;
  }

  .side-panel,
  .progress-panel {
    padding: 0.7rem;
  }

  .side-panel > .primary-action {
    display: none;
  }

  .feedback {
    min-height: 0;
    padding: 0.6rem;
  }

  .auth-grid {
    grid-template-columns: 1fr;
  }

  .tutorial-grid,
  .calibration-summary {
    grid-template-columns: 1fr;
  }

  .onboarding-actions button {
    width: 100%;
  }

  .mobile-action-dock {
    position: fixed;
    z-index: 40;
    left: 0;
    right: 0;
    bottom: 0;
    display: grid;
    grid-template-columns: auto minmax(9.8rem, 1fr);
    align-items: center;
    gap: 0.7rem;
    padding: 0.55rem max(0.65rem, env(safe-area-inset-right)) calc(0.55rem + env(safe-area-inset-bottom)) max(0.65rem, env(safe-area-inset-left));
    border-top: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 -8px 22px rgba(31, 37, 32, 0.12);
  }

  .mobile-dock-meta {
    display: grid;
    min-width: 4.6rem;
    color: var(--muted);
    font-size: 0.75rem;
  }

  .mobile-dock-meta strong {
    color: var(--text);
    font-size: 1.05rem;
  }

  .mobile-action-dock .primary-action {
    min-height: 3rem;
  }
}