:root {
  --bg: #f6f7fb;
  --panel: #ffffff;
  --text: #202124;
  --muted: #626a73;
  --line: #d9dee7;
  --ink: #111827;
  --accent: #2457c5;
  --accent-dark: #173b8f;
  --danger: #b42318;
  --danger-bg: #fff1f0;
  --success: #176b43;
  --warn: #915b00;
  --tile: #e6e8ed;
  --tile-selected: #252a32;
  --yellow: #f7da65;
  --green: #8fc66a;
  --blue: #79a8d8;
  --purple: #b08ac8;
  --shadow: 0 16px 40px rgba(17, 24, 39, 0.09);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

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

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

button,
input,
select {
  font: inherit;
}

a {
  color: inherit;
}

:focus-visible {
  outline: 3px solid rgba(36, 87, 197, 0.45);
  outline-offset: 3px;
}

[hidden] {
  display: none !important;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px clamp(16px, 4vw, 40px);
  border-bottom: 1px solid var(--line);
  background: rgba(246, 247, 251, 0.9);
  backdrop-filter: blur(12px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 800;
  text-decoration: none;
}

.brand-mark {
  display: inline-grid;
  width: 40px;
  height: 40px;
  place-items: center;
  border-radius: var(--radius);
  background: var(--ink);
  color: white;
  font-size: 0.85rem;
}

.top-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
}

.top-nav a {
  border-radius: 999px;
  padding: 8px 12px;
  color: var(--muted);
  font-size: 0.94rem;
  font-weight: 700;
  text-decoration: none;
}

.top-nav a:hover,
.top-nav a[aria-current="page"] {
  background: #e8edf8;
  color: var(--accent-dark);
}

.page-shell {
  width: min(1120px, 100%);
  margin: 0 auto;
  padding: clamp(20px, 4vw, 44px) clamp(16px, 4vw, 40px) 56px;
}

.split-shell {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(320px, 0.88fr);
  align-items: start;
  gap: clamp(18px, 3vw, 32px);
}

.hero-panel,
.notice,
.builder-panel,
.preview-panel,
.summary-panel,
.library-card,
.status-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.hero-panel {
  display: grid;
  gap: 16px;
  max-width: 760px;
  padding: clamp(24px, 5vw, 48px);
}

.hero-panel.compact {
  max-width: 560px;
  margin-top: 22px;
}

.hero-panel h1,
.page-heading h1,
.game-topline h1 {
  max-width: 780px;
  margin: 0;
  color: var(--ink);
  font-size: clamp(2rem, 7vw, 4.1rem);
  line-height: 1;
}

.hero-panel h2,
.preview-heading h2,
.library-card h2,
.summary-panel h2 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(1.2rem, 3vw, 1.6rem);
}

.hero-panel p,
.page-heading p {
  max-width: 680px;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--accent-dark);
  font-size: 0.76rem;
  font-weight: 900;
  text-transform: uppercase;
}

.muted {
  margin: 0;
  color: var(--muted);
}

.button-row,
.action-bar,
.controls,
.library-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: 10px 16px;
  cursor: pointer;
  font-weight: 800;
  text-decoration: none;
  transition:
    transform 150ms ease,
    background 150ms ease,
    border-color 150ms ease;
}

.button:hover:not(:disabled) {
  transform: translateY(-1px);
}

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

.button.primary {
  background: var(--accent);
  color: white;
}

.button.primary:hover:not(:disabled) {
  background: var(--accent-dark);
}

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

.button.danger {
  border-color: #ffd0cc;
  background: var(--danger-bg);
  color: var(--danger);
}

.notice {
  padding: 18px;
}

.notice.error {
  max-width: 720px;
  border-color: #f4b8b4;
  background: var(--danger-bg);
}

.game-layout {
  display: grid;
  gap: 16px;
}

.game-topline {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: end;
}

.status-card {
  display: grid;
  gap: 4px;
  min-width: 210px;
  padding: 14px;
  color: var(--ink);
  font-weight: 800;
}

.message {
  min-height: 28px;
  color: var(--muted);
  font-weight: 800;
}

.message.success {
  color: var(--success);
}

.message.warn {
  color: var(--warn);
}

.solved-rows {
  display: grid;
  gap: 10px;
}

.solved-row {
  display: grid;
  gap: 6px;
  border-radius: var(--radius);
  padding: 14px 16px;
  color: var(--ink);
  animation: lockIn 260ms ease-out;
}

.solved-row p {
  margin: 0;
  font-weight: 750;
}

.solved-heading {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: baseline;
}

.solved-heading strong {
  text-transform: uppercase;
}

.solved-heading span {
  color: rgba(17, 24, 39, 0.72);
  font-size: 0.82rem;
  font-weight: 900;
}

.tile-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(7px, 2vw, 12px);
}

.tile {
  display: grid;
  min-width: 0;
  min-height: clamp(64px, 18vw, 92px);
  place-items: center;
  border: 0;
  border-radius: var(--radius);
  padding: 10px;
  background: var(--tile);
  color: var(--ink);
  cursor: pointer;
  font-size: clamp(0.72rem, 2.5vw, 1.05rem);
  font-weight: 900;
  line-height: 1.08;
  overflow-wrap: anywhere;
  text-align: center;
  text-transform: uppercase;
  transition:
    transform 130ms ease,
    background 130ms ease,
    color 130ms ease;
  user-select: none;
}

.tile:hover:not(:disabled) {
  transform: translateY(-1px);
}

.tile.selected {
  background: var(--tile-selected);
  color: white;
  transform: scale(0.98);
}

.tile:disabled {
  cursor: default;
}

.summary-panel {
  display: grid;
  gap: 12px;
  padding: 18px;
}

.emoji-grid {
  width: max-content;
  max-width: 100%;
  margin: 0;
  border-radius: var(--radius);
  padding: 12px;
  overflow: auto;
  background: #f0f2f7;
  color: var(--ink);
  font: 700 1rem/1.45 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.builder-panel,
.preview-panel {
  padding: clamp(18px, 3vw, 28px);
}

.page-heading {
  margin-bottom: 20px;
}

.page-heading h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
}

.meta-grid,
.group-row,
.member-grid {
  display: grid;
  gap: 12px;
}

.meta-grid,
.group-row {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

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

label {
  display: grid;
  gap: 6px;
  color: var(--ink);
  font-weight: 800;
}

label span {
  color: var(--muted);
  font-size: 0.78rem;
  text-transform: uppercase;
}

input,
select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 11px 12px;
  background: white;
  color: var(--ink);
}

.group-fields {
  display: grid;
  gap: 16px;
  margin-top: 18px;
}

.group-card {
  display: grid;
  gap: 12px;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  background: #fbfcff;
}

.group-card legend {
  padding: 0 6px;
  color: var(--ink);
  font-weight: 900;
}

.form-errors {
  margin: 16px 0;
  color: var(--danger);
  font-weight: 750;
}

.form-errors ul {
  margin: 0;
  padding-left: 20px;
}

.action-bar {
  margin-top: 18px;
}

.preview-panel {
  position: sticky;
  top: 88px;
}

.preview-heading {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: start;
  margin-bottom: 14px;
}

.pill {
  border-radius: 999px;
  padding: 6px 10px;
  background: #e8edf8;
  color: var(--accent-dark);
  font-weight: 900;
}

.preview-grid .tile {
  min-height: clamp(56px, 12vw, 76px);
  cursor: default;
}

.library-list {
  display: grid;
  gap: 16px;
}

.library-card {
  display: grid;
  gap: 16px;
  padding: 18px;
}

.level-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}

.level-strip span {
  min-height: 44px;
  border-radius: var(--radius);
  padding: 8px;
  color: var(--ink);
  font-size: 0.8rem;
  font-weight: 900;
  overflow-wrap: anywhere;
  text-align: center;
}

.level-yellow {
  background: var(--yellow);
}

.level-green {
  background: var(--green);
}

.level-blue {
  background: var(--blue);
}

.level-purple {
  background: var(--purple);
}

.shake {
  animation: shake 420ms ease-in-out;
}

.revealed {
  animation: lockIn 360ms ease-out;
}

@keyframes shake {
  0%,
  100% {
    transform: translateX(0);
  }
  20%,
  60% {
    transform: translateX(-8px);
  }
  40%,
  80% {
    transform: translateX(8px);
  }
}

@keyframes lockIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 840px) {
  .split-shell {
    grid-template-columns: 1fr;
  }

  .preview-panel {
    position: static;
  }

  .game-topline {
    display: grid;
    align-items: start;
  }
}

@media (max-width: 620px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .top-nav {
    justify-content: flex-start;
  }

  .meta-grid,
  .group-row,
  .member-grid,
  .level-strip {
    grid-template-columns: 1fr;
  }

  .tile {
    min-height: 58px;
    padding: 7px;
    font-size: clamp(0.62rem, 2.7vw, 0.84rem);
  }

  .solved-heading {
    display: grid;
  }

  .button {
    width: 100%;
  }

  .controls .button {
    flex: 1 1 140px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    scroll-behavior: auto !important;
    transition-duration: 1ms !important;
  }
}