:root {
  --bg: #f5f5e9;
  --bg-card: #f0f0e4;
  --text: #1a1a14;
  --green: #0e4d44;
  --green-bright: #005c4b;
  --magenta: #b0307a;
  --tile-empty: #f4f7f8;
  --tile-green: #398874;
  --tile-purple: #820458;
  --tile-black: #151811;
  --border: rgba(14, 77, 68, 0.15);
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

a {
  color: var(--green);
}

header.site {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 1.5rem;
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.5);
  gap: 1rem;
  min-height: 3rem;
}

.site-logo {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  color: var(--text);
  white-space: nowrap;
  flex-shrink: 0;
}

/* nav-wrapper holds the clipping nav + the overflow button/menu as siblings */
.nav-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex: 1;
  min-width: 0;
  justify-content: flex-end;
}

.mode-nav {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  overflow: hidden;       /* clips links that don't fit */
  flex-shrink: 1;
  min-width: 0;
  /* justify-content: flex-end so clipped links disappear on the LEFT */
  justify-content: flex-end;
}

.mode-nav a {
  text-decoration: none;
  font-weight: 500;
  font-size: 0.85rem;
  white-space: nowrap;
  color: var(--green);
  padding: 0.2rem 0;
  border-bottom: 2px solid transparent;
  flex-shrink: 0;
}

.mode-nav a:hover {
  border-bottom-color: var(--green);
}

.mode-nav a.active {
  border-bottom-color: var(--green);
  font-weight: 700;
}

.nav-overflow-btn {
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.25rem 0.6rem;
  cursor: pointer;
  color: var(--green);
  white-space: nowrap;
  flex-shrink: 0;
}

/* Dropdown uses position:fixed so it is never clipped by overflow:hidden */
.nav-overflow-menu {
  position: fixed;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.12);
  z-index: 1000;
  min-width: 150px;
  padding: 0.4rem 0;
}

.nav-overflow-menu a {
  display: block;
  padding: 0.45rem 1rem;
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--green);
  white-space: nowrap;
  border-bottom: none !important;
}

.nav-overflow-menu a:hover {
  background: var(--bg-card);
}

.nav-overflow-menu a.active {
  font-weight: 700;
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.5rem;
}

.hero {
  margin-bottom: 2rem;
}

.hero h2 {
  margin: 0 0 0.5rem;
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.hero .accent {
  font-family: Georgia, "Times New Roman", serif;
  font-style: italic;
  color: var(--green);
}

.hero p {
  margin: 0;
  max-width: 42rem;
  opacity: 0.9;
}

.mode-section {
  margin-bottom: 2.5rem;
}

.mode-section h3 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--green);
  margin: 0 0 1rem;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 1rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.1rem;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.card h4 {
  margin: 0;
  font-size: 1rem;
}

.card .meta {
  font-size: 0.85rem;
  opacity: 0.8;
}

.card.pro {
  border-color: var(--magenta);
  background: linear-gradient(145deg, #2d2d26 0%, #1e1e1c 100%);
  color: #f5f5e9;
}

.card.pro .meta {
  opacity: 0.85;
}

.btn {
  display: inline-block;
  border: none;
  border-radius: 8px;
  padding: 0.55rem 1rem;
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  margin-top: auto;
}

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

.btn-primary:hover {
  background: var(--green-bright);
}

.btn-magenta {
  background: var(--magenta);
  color: #fff;
}

.btn-magenta:hover {
  filter: brightness(1.08);
}

.btn-ghost {
  background: transparent;
  color: var(--green);
  border: 1px solid var(--border);
}

.engine-layout {
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: 1.5rem;
  align-items: start;
}

@media (max-width: 860px) {
  .engine-layout {
    grid-template-columns: 1fr;
  }
  .panel-side {
    display: none;
  }
}

.panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
  box-shadow: var(--shadow);
}

.panel h3 {
  margin: 0 0 0.75rem;
  font-size: 1rem;
}

.panel-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.panel-title-row h3 {
  margin: 0;
}

.toolbar-right {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  margin-bottom: 1rem;
}

.suggestion-row {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
  flex-wrap: wrap;
  margin-bottom: 0.5rem;
}

.suggestion-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--green);
  margin-bottom: 0.15rem;
}

.remaining-inline .remaining-box {
  font-size: 1.2rem;
  font-weight: 800;
}

.strategy-toggle {
  display: inline-flex;
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: #fff;
}

.strategy-toggle button {
  border: none;
  padding: 0.45rem 0.9rem;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  background: transparent;
  color: var(--text);
}

.strategy-toggle button.active {
  background: var(--green);
  color: #fff;
}

.strategy-hint {
  font-size: 0.75rem;
  opacity: 0.75;
  width: 100%;
}

.tile-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 0.75rem;
  align-items: center;
}

.tile-row label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--green);
  width: 100%;
  margin-bottom: -0.25rem;
}

.tile {
  width: 2.35rem;
  height: 2.35rem;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
  background: #fff;
  border: 2px solid var(--border);
  cursor: pointer;
  user-select: none;
  color: var(--text);
}

.tile.char-empty {
  background: var(--tile-empty);
  color: #888;
}

.tile.fb-none {
  background: var(--tile-empty);
  border-style: dashed;
}

.tile.fb-green {
  background: var(--tile-green);
  border-color: var(--tile-green);
  color: #fff;
}

.tile.fb-purple {
  background: var(--tile-purple);
  border-color: var(--tile-purple);
  color: #fff;
}

.tile.fb-black {
  background: var(--tile-black);
  border-color: var(--tile-black);
  color: #fff;
}

/* Combined guess + feedback: full tile is the feedback color */
.tile.combined {
  flex-direction: column;
  gap: 0;
  padding: 0.15rem;
  min-width: 2.35rem;
  min-height: 2.6rem;
}

.tile.combined .tile-char {
  font-size: 1.05rem;
  line-height: 1.2;
}

.tile.combined.tile-cursor-active {
  outline: 3px solid var(--green-bright);
  outline-offset: 1px;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.35);
  z-index: 1;
}

#combined-boards:focus {
  outline: none;
}

#combined-boards:focus-visible {
  box-shadow: 0 0 0 2px var(--green-bright);
  border-radius: 6px;
}

.board-block {
  margin-bottom: 0.75rem;
}

.board-block .board-label {
  display: block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--green);
  margin-bottom: 0.35rem;
}

kbd {
  font-family: ui-monospace, monospace;
  font-size: 0.75em;
  padding: 0.1em 0.35em;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: #fff;
}

.keypad {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 1rem;
}

.keypad button {
  min-width: 2.4rem;
  padding: 0.5rem 0.45rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #fff;
  font-weight: 600;
  cursor: pointer;
  font-size: 0.9rem;
}

.keypad button:hover {
  background: var(--bg-card);
}

.keypad .key-wide {
  min-width: 4.5rem;
}

.tile.tile-solved {
  cursor: default;
  opacity: 0.85;
}

.tile.combined.fb-grey-known {
  background: #c5cac7;
  border-color: #a8aea9;
  color: #2a2e2c;
  cursor: default;
  opacity: 0.92;
}

.board-known-tag {
  font-weight: 600;
  opacity: 0.75;
  color: var(--text);
}

.board-solved-tick {
  color: var(--tile-green);
}

.history {
  margin-top: 1.25rem;
  font-size: 0.8rem;
}

.history-header {
  font-weight: 700;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--green);
  margin-bottom: 0.35rem;
}

.history-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.3rem 0;
  border-bottom: 1px solid var(--border);
  font-family: ui-monospace, monospace;
}

.history-del {
  background: none;
  border: none;
  color: #aaa;
  cursor: pointer;
  font-size: 0.75rem;
  padding: 0.15rem 0.3rem;
  border-radius: 4px;
  flex-shrink: 0;
  margin-left: 0.5rem;
}

.history-del:hover {
  background: var(--bg-card);
  color: #b03030;
}

.suggestion-box {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--green-bright);
  margin: 0.5rem 0;
  word-break: break-all;
}

.remaining-box {
  font-size: 1.5rem;
  font-weight: 800;
}

.msg-error {
  color: #b03030;
  font-size: 0.9rem;
  margin-top: 0.5rem;
}

footer.note {
  margin-top: 2rem;
  font-size: 0.75rem;
  opacity: 0.7;
}