:root {
  color-scheme: light;
  --bg: #f4f1e8;
  --surface: #fffdf7;
  --surface-strong: #ffffff;
  --ink: #1f2428;
  --muted: #69706f;
  --line: #d9d1c3;
  --line-strong: #bfb4a3;
  --green: #0f6b4f;
  --green-dark: #0a4736;
  --red: #b94040;
  --blue: #315d9b;
  --gold: #c28a20;
  --shadow: 0 16px 34px rgba(31, 36, 40, 0.11);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--bg);
}

body {
  min-height: 100%;
  margin: 0;
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.45;
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

.app-shell {
  width: min(1220px, calc(100% - 32px));
  margin: 0 auto;
  padding: 20px 0 28px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 18px 0;
}

.brand {
  display: flex;
  align-items: center;
  min-width: 0;
  gap: 12px;
}

.brand-mark {
  display: grid;
  flex: 0 0 auto;
  width: 48px;
  height: 48px;
  place-items: center;
  border: 2px solid var(--green);
  border-radius: 8px;
  background: var(--surface);
  color: var(--green-dark);
  font-weight: 800;
}

h1,
h2,
h3,
p {
  margin: 0;
}

h1 {
  font-size: 1.2rem;
  letter-spacing: 0;
}

.brand p,
.section-subtitle,
.muted,
.app-footer {
  color: var(--muted);
}

.topbar-actions {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 10px;
}

.repo-link {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  padding: 0 12px;
  color: var(--green-dark);
  font-size: 0.88rem;
  font-weight: 800;
  text-decoration: none;
}

.repo-link:hover,
.repo-link:focus-visible {
  border-color: var(--green);
  outline: 0;
  background: #e5f4ee;
}

.ruleset {
  flex: 0 0 auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 253, 247, 0.78);
  padding: 8px 12px;
  color: var(--green-dark);
  font-size: 0.88rem;
  font-weight: 700;
  overflow-wrap: anywhere;
}

.tabs {
  display: flex;
  gap: 6px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.tab,
.action-button,
.dealer-button,
.secondary-button,
.primary-button,
.danger-button {
  min-height: 40px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--ink);
  font-weight: 750;
}

.tab {
  flex: 1;
  padding: 0 14px;
}

.tab.active {
  background: var(--green);
  color: #fff;
}

.app-main {
  margin-top: 18px;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: 290px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.side-panel,
.content-panel,
.practice-panel,
.chart-panel,
.summary-strip {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.side-panel {
  position: sticky;
  top: 16px;
  padding: 16px;
}

.panel-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 14px;
}

.panel-header h2 {
  font-size: 1.05rem;
}

.dealer-list {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 8px;
}

.dealer-button {
  display: grid;
  min-height: 52px;
  place-items: center;
  border-color: var(--line);
  background: var(--surface-strong);
  color: var(--ink);
}

.dealer-button.active {
  border-color: var(--green);
  background: #e5f4ee;
  color: var(--green-dark);
}

.dealer-button.complete {
  border-color: rgba(15, 107, 79, 0.55);
}

.dealer-button.locked {
  cursor: not-allowed;
  color: #9c9488;
  background: #eee8dc;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 16px;
}

.stat {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-strong);
  padding: 11px;
}

.stat strong {
  display: block;
  font-size: 1.35rem;
}

.stat span {
  color: var(--muted);
  font-size: 0.82rem;
}

.content-panel {
  overflow: hidden;
}

.hero-band {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 18px;
  align-items: center;
  padding: 24px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(90deg, #fffdf7 0%, #e8f3ee 100%);
}

.hero-copy h2 {
  max-width: 720px;
  font-size: clamp(1.7rem, 3vw, 3rem);
  line-height: 1.05;
  letter-spacing: 0;
}

.hero-copy p {
  max-width: 690px;
  margin-top: 10px;
  color: var(--muted);
  font-size: 1rem;
}

.dealer-math-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  max-width: 620px;
  gap: 10px;
  margin-top: 16px;
}

.overall-chance {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.35fr);
  max-width: 620px;
  gap: 10px;
  align-items: stretch;
  margin-top: 10px;
  border: 1px solid rgba(15, 107, 79, 0.25);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.58);
  padding: 10px;
}

.overall-copy {
  align-self: center;
}

.overall-copy span {
  display: block;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 750;
}

.overall-copy strong {
  display: block;
  font-size: 1rem;
}

.overall-copy p {
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.8rem;
}

.overall-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.header-metric {
  border: 1px solid rgba(15, 107, 79, 0.25);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
  padding: 10px 12px;
}

.header-metric span {
  display: block;
  color: var(--muted);
  font-size: 0.8rem;
}

.header-metric strong {
  display: block;
  font-size: 1.28rem;
  line-height: 1.15;
}

.felt-table {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 190px;
  min-height: 150px;
  border: 8px solid #7d4c29;
  border-radius: 8px;
  background: #126245;
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.12);
}

.dealer-card {
  display: grid;
  width: 82px;
  height: 112px;
  place-items: center;
  border: 1px solid #d7d7d7;
  border-radius: 7px;
  background: #fff;
  color: var(--red);
  font-size: 2.5rem;
  font-weight: 850;
  box-shadow: 0 6px 14px rgba(0, 0, 0, 0.18);
}

.section {
  padding: 22px 24px;
  border-bottom: 1px solid var(--line);
}

.section:last-child {
  border-bottom: 0;
}

.section-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 14px;
}

.section-heading h3 {
  font-size: 1rem;
}

.lesson-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.basics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
}

.basic-item {
  border-left: 3px solid var(--green);
  padding: 3px 0 3px 12px;
}

.basic-item strong {
  display: block;
  margin-bottom: 4px;
}

.basic-item p {
  color: var(--muted);
  font-size: 0.92rem;
}

.lesson-card,
.quiz-item,
.feedback,
.practice-card,
.chart-note {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-strong);
}

.lesson-card {
  padding: 14px;
}

.lesson-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.lesson-title strong {
  min-width: 0;
}

.action-pill {
  flex: 0 0 auto;
  min-width: 78px;
  border-radius: 999px;
  padding: 4px 9px;
  color: #fff;
  text-align: center;
  font-size: 0.78rem;
  font-weight: 850;
}

.action-hit {
  background: var(--blue);
}

.action-stand {
  background: var(--green);
}

.action-double {
  background: var(--gold);
  color: #1f2428;
}

.action-split {
  background: var(--red);
}

.math-panel {
  margin-top: 13px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.math-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.math-heading span,
.math-note {
  color: var(--muted);
  font-size: 0.82rem;
}

.outcome-table {
  display: grid;
  grid-template-columns: minmax(74px, 1.2fr) repeat(3, minmax(48px, 1fr));
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fffaf2;
}

.outcome-head,
.outcome-label,
.outcome-value {
  min-width: 0;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 8px;
}

.outcome-head:nth-child(4n),
.outcome-label:nth-child(4n),
.outcome-value:nth-child(4n) {
  border-right: 0;
}

.outcome-table > :nth-last-child(-n + 4) {
  border-bottom: 0;
}

.outcome-head {
  background: #f2eadf;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 850;
}

.outcome-label {
  font-weight: 850;
}

.outcome-value {
  font-weight: 850;
  text-align: center;
}

.math-note {
  margin-top: 8px;
}

.quiz-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.quiz-item {
  padding: 14px;
}

.hand-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 10px 0;
}

.card-row {
  display: flex;
  gap: 6px;
}

.playing-card {
  display: grid;
  width: 42px;
  height: 58px;
  grid-template-rows: 1fr auto;
  border: 1px solid #dadada;
  border-radius: 6px;
  background: #fff;
  padding: 5px;
  font-weight: 850;
  box-shadow: 0 2px 6px rgba(31, 36, 40, 0.12);
}

.playing-card.red {
  color: var(--red);
}

.playing-card.black {
  color: #1c2227;
}

.playing-card.card-back {
  border-color: #0a4736;
  background: repeating-linear-gradient(45deg, #0f6b4f 0 7px, #126245 7px 14px);
  color: #fff;
}

.playing-card span:last-child {
  justify-self: end;
  font-size: 0.75rem;
}

.playing-card.card-back span:last-child {
  align-self: center;
  justify-self: center;
  font-size: 1.35rem;
}

.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.action-button {
  min-width: 86px;
  border-color: var(--line-strong);
  background: #fff;
  padding: 0 12px;
}

.action-button:hover,
.dealer-button:not(.locked):hover,
.secondary-button:hover,
.danger-button:hover {
  border-color: var(--green);
}

.action-button.selected {
  border-color: var(--green);
  background: #e5f4ee;
  color: var(--green-dark);
}

.action-button.correct {
  border-color: var(--green);
  background: #dff1e8;
}

.action-button.incorrect {
  border-color: var(--red);
  background: #f8e6e3;
}

.controls-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-top: 14px;
}

.primary-button,
.secondary-button,
.danger-button {
  padding: 0 14px;
}

.primary-button {
  background: var(--green);
  color: #fff;
}

.primary-button:disabled {
  cursor: not-allowed;
  opacity: 0.48;
}

.secondary-button {
  border-color: var(--line-strong);
  background: #fff;
}

.danger-button {
  border-color: #ddb1aa;
  background: #fff;
  color: #8f2727;
}

.feedback {
  margin-top: 12px;
  padding: 13px;
}

.feedback.good {
  border-color: rgba(15, 107, 79, 0.55);
  background: #e8f6ef;
}

.feedback.bad {
  border-color: rgba(185, 64, 64, 0.45);
  background: #f9e8e5;
}

.practice-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(270px, 0.65fr);
  gap: 18px;
}

.practice-panel,
.chart-panel {
  padding: 22px;
}

.practice-card {
  margin-top: 16px;
  padding: 18px;
}

.practice-hands {
  display: grid;
  gap: 14px;
  margin: 18px 0;
}

.practice-hand-row {
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr);
  gap: 14px;
  align-items: center;
}

.hand-label {
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 850;
}

.large-hand {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin: 18px 0;
}

.large-hand .playing-card {
  width: 58px;
  height: 78px;
  font-size: 1.08rem;
}

.summary-strip {
  display: grid;
  gap: 12px;
  padding: 16px;
}

.chart-section {
  margin-top: 18px;
}

.chart-section:first-of-type {
  margin-top: 8px;
}

.chart-section-heading {
  margin-bottom: 10px;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

table {
  width: 100%;
  min-width: 720px;
  border-collapse: collapse;
}

th,
td {
  border-bottom: 1px solid var(--line);
  border-right: 1px solid var(--line);
  padding: 9px;
  text-align: center;
  white-space: nowrap;
}

th:last-child,
td:last-child {
  border-right: 0;
}

tr:last-child td {
  border-bottom: 0;
}

th {
  background: #f2eadf;
  color: #4a4036;
  font-size: 0.84rem;
}

td:first-child,
th:first-child {
  position: sticky;
  left: 0;
  z-index: 1;
  background: #fffaf0;
  text-align: left;
  font-weight: 800;
}

.chart-action {
  display: inline-grid;
  width: 32px;
  height: 28px;
  place-items: center;
  border-radius: 6px;
  color: #fff;
  font-weight: 900;
}

.chart-action.action-double {
  color: #1f2428;
}

.chart-note {
  margin-top: 14px;
  padding: 12px;
  color: var(--muted);
}

.app-footer {
  padding: 18px 2px 0;
  font-size: 0.88rem;
}

@media (max-width: 900px) {
  .app-shell {
    width: min(100% - 20px, 1220px);
  }

  .hero-band,
  .practice-layout {
    grid-template-columns: 1fr;
  }

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

  .topbar-actions {
    width: 100%;
    flex-wrap: wrap;
  }

  .repo-link {
    flex: 1 1 150px;
    justify-content: center;
  }

  .ruleset {
    flex: 1 1 240px;
    text-align: center;
  }

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

  .side-panel {
    position: static;
  }

  .felt-table {
    min-height: 132px;
  }

  .dealer-math-strip {
    max-width: none;
  }

  .overall-chance {
    max-width: none;
  }

  .lesson-grid,
  .quiz-grid,
  .basics-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .tabs {
    overflow-x: auto;
  }

  .tab {
    flex: 0 0 auto;
  }

  .dealer-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .hero-band,
  .section,
  .practice-panel,
  .chart-panel {
    padding: 16px;
  }

  .section-heading {
    display: block;
  }

  .section-subtitle {
    margin-top: 4px;
  }

  .action-button {
    flex: 1 1 42%;
  }

  .practice-hand-row {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .dealer-math-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .overall-chance,
  .overall-metrics {
    grid-template-columns: 1fr;
  }
}