:root {
  --paper: #f4efe6;
  --paper-strong: #f9f5ee;
  --ink: #151515;
  --muted: #666156;
  --line: #d8d0c3;
  --gold: #d89d2a;
  --red: #d45f43;
  --blue: #5c7fa8;
  --olive: #9ca45d;
  --tile: #efe8dd;
  --tile-pressed: #e5dccd;
  --shadow: 0 18px 50px rgba(24, 20, 12, 0.08);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: Georgia, "Times New Roman", serif;
  color: var(--ink);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.55), rgba(255, 255, 255, 0)),
    var(--paper);
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

.page-shell {
  width: min(1280px, calc(100% - 32px));
  margin: 16px auto 28px;
}

.masthead {
  background: var(--paper-strong);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.masthead-top,
.brand-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 18px;
}

.masthead-top {
  border-bottom: 1px solid var(--line);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.brand-row {
  padding-top: 18px;
  padding-bottom: 18px;
}

.menu-button {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  background: white;
}

.menu-button span {
  width: 18px;
  height: 1px;
  margin: 0 auto;
  background: var(--ink);
}

.brand-lockup {
  text-align: center;
}

.brand-kicker,
.section-label,
.edition-mark,
.tab-index,
.panel-status,
.stat-card span,
.sumline-target span,
.mini-list span {
  font-family: Arial, Helvetica, sans-serif;
}

.brand-kicker,
.section-label {
  margin: 0 0 6px;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.brand-lockup h1 {
  margin: 0;
  font-size: clamp(44px, 7vw, 76px);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 0.92;
}

.brand-meta {
  display: grid;
  justify-items: end;
  gap: 2px;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 13px;
  color: var(--muted);
}

.layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr) 250px;
  gap: 18px;
  margin-top: 18px;
}

.hero-panel,
.game-rail,
.game-panel,
.sidebar-card {
  background: var(--paper-strong);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.hero-panel {
  grid-column: 1 / -1;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 26px 28px;
}

.hero-copy h2 {
  margin: 0;
  max-width: 620px;
  font-size: clamp(32px, 5vw, 64px);
  line-height: 0.95;
  letter-spacing: -0.045em;
  font-weight: 700;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(108px, 1fr));
  gap: 12px;
  width: min(420px, 100%);
}

.stat-card {
  padding: 14px;
  background: white;
  border: 1px solid var(--line);
}

.stat-card span {
  display: block;
  margin-bottom: 10px;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.stat-card strong {
  font-size: clamp(28px, 4vw, 42px);
  letter-spacing: -0.06em;
}

.game-rail {
  padding: 12px;
  display: grid;
  align-content: start;
  gap: 12px;
}

.game-tab {
  width: 100%;
  padding: 16px;
  text-align: left;
  border: 1px solid var(--line);
  background: white;
  transition: transform 140ms ease, border-color 140ms ease, background 140ms ease;
}

.game-tab:hover {
  transform: translateY(-1px);
}

.game-tab.is-active {
  background: var(--ink);
  color: var(--paper-strong);
  border-color: var(--ink);
}

.tab-index {
  display: block;
  margin-bottom: 8px;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.tab-name {
  display: block;
  margin-bottom: 6px;
  font-size: 24px;
  letter-spacing: -0.04em;
}

.tab-meta {
  display: block;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 13px;
  line-height: 1.45;
  color: inherit;
  opacity: 0.8;
}

.game-stage {
  min-width: 0;
}

.game-panel {
  display: none;
  padding: 24px;
}

.game-panel.is-visible {
  display: block;
}

.panel-head,
.sumline-meta,
.panel-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.panel-head {
  margin-bottom: 20px;
}

.panel-head h3 {
  margin: 0;
  font-size: clamp(26px, 3vw, 40px);
  letter-spacing: -0.04em;
}

.panel-status {
  display: grid;
  justify-items: end;
  gap: 4px;
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.gridlock-board {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.gridlock-tile,
.sumline-tile {
  min-height: 88px;
  border: 1px solid var(--line);
  background: var(--tile);
  color: var(--ink);
  transition: transform 120ms ease, background 120ms ease, border-color 120ms ease;
}

.gridlock-tile {
  padding: 12px;
  font-family: Arial, Helvetica, sans-serif;
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.02em;
}

.gridlock-tile:hover,
.sumline-tile:hover {
  transform: translateY(-1px);
}

.gridlock-tile.is-selected,
.sumline-tile.is-selected {
  background: var(--ink);
  color: var(--paper-strong);
  border-color: var(--ink);
}

.gridlock-tile.is-solved {
  color: white;
}

.gridlock-tile[data-group-color="gold"] {
  background: var(--gold);
}

.gridlock-tile[data-group-color="red"] {
  background: var(--red);
}

.gridlock-tile[data-group-color="blue"] {
  background: var(--blue);
}

.gridlock-tile[data-group-color="olive"] {
  background: var(--olive);
}

.panel-actions {
  margin-top: 18px;
}

.action-button {
  padding: 12px 18px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--paper-strong);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.action-button-dark {
  background: white;
  color: var(--ink);
  border-color: var(--line);
}

.solved-groups {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.solved-card {
  padding: 14px 16px;
  color: white;
}

.solved-card h4,
.solved-card p {
  margin: 0;
}

.solved-card h4 {
  margin-bottom: 6px;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.solved-card p {
  font-size: 19px;
}

.fivefold-board {
  display: grid;
  gap: 10px;
}

.fivefold-row {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 70px));
  gap: 10px;
}

.fivefold-cell {
  aspect-ratio: 1 / 1;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  background: white;
  font-family: Arial, Helvetica, sans-serif;
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  text-transform: uppercase;
}

.fivefold-cell.is-correct {
  background: var(--olive);
  color: white;
  border-color: var(--olive);
}

.fivefold-cell.is-close {
  background: var(--gold);
  color: white;
  border-color: var(--gold);
}

.fivefold-cell.is-miss {
  background: #d6d0c5;
  color: #524c43;
  border-color: #d6d0c5;
}

.fivefold-entry {
  display: flex;
  gap: 10px;
  margin-top: 18px;
}

.fivefold-entry input {
  flex: 1;
  min-width: 0;
  padding: 14px 16px;
  border: 1px solid var(--line);
  background: white;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 16px;
}

.sumline-meta {
  margin-bottom: 16px;
}

.sumline-target strong {
  display: block;
  font-size: 42px;
  letter-spacing: -0.06em;
}

.sumline-board {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.sumline-tile {
  display: grid;
  place-items: center;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 30px;
  font-weight: 700;
}

.sumline-tile.is-locked {
  background: var(--blue);
  color: white;
  border-color: var(--blue);
}

.sidebar {
  display: grid;
  align-content: start;
  gap: 18px;
}

.sidebar-card {
  padding: 18px;
}

.mini-list {
  display: grid;
  gap: 14px;
}

.mini-list article {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
}

.mini-list strong {
  font-size: 20px;
  letter-spacing: -0.04em;
}

.mini-list span {
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.mood-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.mood-chip {
  display: inline-flex;
  align-items: center;
  padding: 10px 14px;
  border-radius: 999px;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.mood-chip-gold {
  background: rgba(216, 157, 42, 0.18);
  color: #8b6113;
}

.mood-chip-red {
  background: rgba(212, 95, 67, 0.16);
  color: #98432e;
}

.mood-chip-blue {
  background: rgba(92, 127, 168, 0.16);
  color: #456484;
}

@media (max-width: 1080px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .game-rail,
  .sidebar {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    display: grid;
  }

  .hero-panel,
  .panel-head,
  .sumline-meta,
  .panel-actions {
    flex-direction: column;
    align-items: flex-start;
  }

  .panel-status {
    justify-items: start;
  }
}

@media (max-width: 760px) {
  .page-shell {
    width: min(100% - 20px, 1280px);
  }

  .brand-row,
  .masthead-top {
    padding-left: 14px;
    padding-right: 14px;
  }

  .brand-meta {
    display: none;
  }

  .hero-panel,
  .game-panel,
  .sidebar-card {
    padding: 18px;
  }

  .hero-stats,
  .game-rail,
  .sidebar {
    grid-template-columns: 1fr;
  }

  .gridlock-board,
  .sumline-board {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .fivefold-row {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}