:root {
  --font-display: "Trebuchet MS", "Avenir Next", "Segoe UI", sans-serif;
  --font-body: "Gill Sans", "Noto Sans", "Lucida Grande", sans-serif;
  --ink-strong: #f5efe3;
  --ink-soft: #b3a58c;
  --surface: #191510;
  --surface-panel: #201b14;
  --surface-card: #26211a;
  --line-soft: #3d352a;
  --line-strong: #6d5f49;
  --accent: #f0683a;
  --accent-strong: #d9561f;
  --accent-alt: #2bb3ba;
  --shadow-soft: 0 16px 30px rgba(0, 0, 0, 0.45);
  --shadow-lift: 0 28px 54px rgba(0, 0, 0, 0.55);
  --board-bg: #fef3c7;
  --board-border: #78350f;
  --dot-border: #9c7c48;
  --peg-red: #dc2626;
  --peg-white: #f1f5f9;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  color: var(--ink-strong);
  font-family: var(--font-body);
  background:
    radial-gradient(circle at 100% -20%, rgba(240, 104, 58, 0.18), transparent 44%),
    radial-gradient(circle at 8% 14%, rgba(43, 179, 186, 0.16), transparent 42%),
    linear-gradient(175deg, #1d1811 0%, #181410 52%, #120f0a 100%);
}

button,
input,
select {
  font: inherit;
}

.app {
  width: min(1320px, calc(100vw - 1rem));
  margin: 0.7rem auto 1.8rem;
  display: flex;
  flex-direction: column;
  gap: 0.95rem;
}

.back-nav {
  margin-bottom: 0.5rem;
}
.back-link {
  color: var(--ink-strong);
  text-decoration: none;
  font-weight: 500;
}
.back-link:hover {
  text-decoration: underline;
}

.hero {
  text-align: center;
  padding: 1.5rem 1rem 1rem;
  background: var(--surface-panel);
  border: 1px solid var(--line-soft);
  border-radius: 12px;
  box-shadow: var(--shadow-soft);
}
.hero-copy h1 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 5vw, 2.4rem);
  margin: 0 0 0.25rem;
}
.hero-copy p {
  font-size: 1.05rem;
  color: var(--ink-soft);
  margin: 0;
}

main {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem;
  align-items: start;
}
@media (max-width: 700px) {
  main {
    grid-template-columns: 1fr;
  }
  .settings-card {
    grid-column: auto;
  }
  .controls {
    position: sticky;
    bottom: 0.75rem;
    z-index: 10;
    margin-top: 0.25rem;
  }
}

.board-panel {
  background: var(--surface-panel);
  border: 1px solid var(--line-soft);
  border-radius: 12px;
  padding: 1.25rem;
  box-shadow: var(--shadow-soft);
}

.play-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

/* 10 rows x 4 peg slots + 2x2 feedback slots */
.board {
  display: grid;
  grid-template-columns: repeat(4, 1fr) 1.5rem repeat(2, 0.65rem);
  grid-template-rows: repeat(20, 1fr);
  gap: 5px;
  max-width: min(90vw, 360px);
  width: 100%;
}

.peg-slot {
  width: 100%;
  aspect-ratio: 1;
  align-self: center;
  border-radius: 50%;
  background: var(--board-bg);
  border: 2px solid var(--board-border);
  cursor: pointer;
  transition:
    transform 0.1s,
    box-shadow 0.1s;
  position: relative;
}

.peg-slot:hover {
  transform: scale(1.08);
}

.peg-slot.selected {
  outline: 3px solid rgba(59, 130, 246, 0.9);
  outline-offset: -3px;
}

.peg-slot.locked {
  cursor: default;
}
.peg-slot.locked:hover {
  transform: none;
}

/* Peg colors */
.peg-slot.v1 {
  background: #dc2626;
} /* red */
.peg-slot.v2 {
  background: #2563eb;
} /* blue */
.peg-slot.v3 {
  background: #16a34a;
} /* green */
.peg-slot.v4 {
  background: #eab308;
} /* yellow */
.peg-slot.v5 {
  background: #9333ea;
} /* purple */
.peg-slot.v6 {
  background: #ea580c;
} /* orange */
.peg-slot.v0 {
  background: var(--board-bg);
  border-style: dashed;
}

/* Row separator cell */
.row-sep {
  visibility: hidden;
}

/* Feedback dots */
/* Feedback 2x2 matrix */
.feedback {
  display: grid;
  grid-template-columns: repeat(2, 0.6rem);
  grid-template-rows: repeat(2, 0.6rem);
  gap: 3px;
  justify-self: center;
  align-self: center;
}

.feedback-dot {
  width: 0.6rem;
  height: 0.6rem;
  border-radius: 50%;
  border: 1px solid var(--dot-border);
}

.feedback-dot.correct-color-and-position {
  background: var(--peg-red);
}
.feedback-dot.correct-color-not-position {
  background: var(--peg-white);
}
.feedback-dot.empty {
  background-color: transparent;
  border-style: dashed;
}

/* Palette */
.palette {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0.75rem 0;
}

.palette-swatch {
  width: clamp(2.75rem, 8vw, 3.25rem);
  height: clamp(2.75rem, 8vw, 3.25rem);
  border-radius: 50%;
  border: 3px solid var(--line-strong);
  cursor: pointer;
  transition:
    transform 0.1s,
    box-shadow 0.1s;
}
.palette-swatch:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-soft);
}
.palette-swatch.swatch-empty {
  background: transparent;
  border-style: dashed;
  font-size: 0.8rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-soft);
}

.swatch-s1 {
  background: #dc2626;
}
.swatch-s2 {
  background: #2563eb;
}
.swatch-s3 {
  background: #16a34a;
}
.swatch-s4 {
  background: #eab308;
}
.swatch-s5 {
  background: #9333ea;
}
.swatch-s6 {
  background: #ea580c;
}

/* Controls */
.controls {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
@media (min-width: 701px) {
  .settings-card {
    grid-column: 2;
  }
}

.control-card {
  background: var(--surface-card);
  border: 1px solid var(--line-soft);
  border-radius: 12px;
  padding: 1.25rem;
  box-shadow: var(--shadow-soft);
}

.status-row {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 0.75rem;
}
.status-row span {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-soft);
}
.status-row strong {
  font-size: 1.5rem;
}

#statusMessage {
  font-size: 0.9rem;
  color: var(--ink-soft);
  text-align: center;
  margin: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 48px;
  padding: 0.7rem 1.4rem;
  border-radius: 24px;
  border: 2px solid var(--line-strong);
  background: linear-gradient(135deg, var(--surface-card) 0%, var(--surface-panel) 100%);
  font: 700 1rem var(--font-display);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(31, 41, 51, 0.15);
  transition:
    transform 120ms ease,
    box-shadow 120ms ease;
}
.btn:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(31, 41, 51, 0.2);
}
.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-secondary {
  margin-top: 0.75rem;
  background: var(--surface-panel);
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  font-size: 0.95rem;
}

/* Overlay */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
}
.overlay-panel {
  background: var(--surface-card);
  padding: 2rem;
  border-radius: 16px;
  text-align: center;
  box-shadow: var(--shadow-lift);
}
.overlay-panel h2 {
  margin: 0 0 0.5rem;
  font-size: 1.5rem;
}
.overlay-panel p {
  margin: 0 0 1rem;
  color: var(--ink-soft);
}

.secret-display {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin: 0.75rem 0 1rem;
}
.secret-peg {
  width: 1.4rem;
  height: 1.4rem;
  border-radius: 50%;
  border: 2px solid var(--board-border);
  display: inline-block;
}
.secret-peg.secret-empty {
  background: transparent;
  border-style: dashed;
}
.hidden {
  display: none !important;
}