/**
 * styles.css — Doublets layout and theme.
 * Wordle-like centered single screen: light/dark, mobile-first, accessible.
 */

:root {
  --bg: #FFFCF0; /* Flexoki paper */
  --bg-elev: #F2F0E5; /* Flexoki base-50 */
  --ink: #100F0F; /* Flexoki black */
  --ink-muted: #6F6E69; /* Flexoki base-600 */
  --line: #DAD8CE; /* Flexoki base-150 */
  --accent: #24837B; /* Flexoki cyan-600 */
  --accent-soft: #DDF1E4; /* Flexoki cyan-50 */
  --warn: #BC5215; /* Flexoki orange-600 */
  --danger: #AF3029; /* Flexoki red-600 */
  --tile: #FFFCF0; /* Flexoki paper */
  --tile-edge: #CECDC3; /* Flexoki base-200 */
  --changed: #24837B; /* Flexoki cyan-600 */
  --changed-bg: #DDF1E4; /* Flexoki cyan-50 */
  --start-bg: #E6E4D9; /* Flexoki base-100 */
  --target-bg: #100F0F; /* Flexoki black */
  --target-ink: #FFFCF0; /* Flexoki paper */
  --shadow: 0 10px 30px rgba(16, 15, 15, 0.08);
  --radius: 12px;
  --font-display: "Fraunces", Georgia, "Times New Roman", serif;
  --font-body: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  color-scheme: light;
}

[data-theme="dark"] {
  --bg: #100F0F; /* Flexoki black */
  --bg-elev: #1C1B1A; /* Flexoki base-950 */
  --ink: #CECDC3; /* Flexoki base-200 */
  --ink-muted: #878580; /* Flexoki base-500 */
  --line: #282726; /* Flexoki base-900 */
  --accent: #3AA99F; /* Flexoki cyan-400 */
  --accent-soft: #122F2C; /* Flexoki cyan-900 */
  --warn: #DA702C; /* Flexoki orange-400 */
  --danger: #D14D41; /* Flexoki red-400 */
  --tile: #1C1B1A; /* Flexoki base-950 */
  --tile-edge: #343331; /* Flexoki base-850 */
  --changed: #3AA99F; /* Flexoki cyan-400 */
  --changed-bg: #122F2C; /* Flexoki cyan-900 */
  --start-bg: #282726; /* Flexoki base-900 */
  --target-bg: #CECDC3; /* Flexoki base-200 */
  --target-ink: #100F0F; /* Flexoki black */
  --shadow: 0 12px 32px rgba(0, 0, 0, 0.45);
  color-scheme: dark;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  height: 100%;
}

body {
  margin: 0;
  min-height: 100%;
  font-family: var(--font-body);
  background:
    radial-gradient(1200px 600px at 50% -10%, color-mix(in srgb, var(--accent) 12%, transparent), transparent 60%),
    linear-gradient(180deg, var(--bg) 0%, color-mix(in srgb, var(--bg) 92%, var(--accent) 8%) 100%);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
}

[data-theme="dark"] body,
body {
  background-attachment: fixed;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: white;
  padding: 0.5rem 1rem;
  z-index: 100;
}

.skip-link:focus {
  left: 0.5rem;
  top: 0.5rem;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* —— Top bar —— */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(10px);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom: 1px solid var(--line);
}

.topbar-inner {
  max-width: 440px;
  margin: 0 auto;
  padding: 0.65rem 0.85rem;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.5rem;
}

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

.brand {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.55rem;
  letter-spacing: 0.01em;
  line-height: 1.1;
}

.puzzle-meta {
  margin: 0.1rem 0 0;
  font-size: 0.78rem;
  color: var(--ink-muted);
}

.sister-link {
  margin: 0.35rem 0 0;
  font-size: 0.72rem;
}

.sister-link a {
  color: var(--ink-muted);
  text-underline-offset: 0.15em;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.2rem;
}

.streak-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.15rem;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.2rem 0.45rem;
  border-radius: 999px;
  color: var(--ink);
}

.icon-btn {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--ink);
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1.35rem;
  line-height: 1;
  display: inline-grid;
  place-items: center;
}

.icon-btn svg[hidden] {
  display: none;
}

.icon-btn:hover,
.icon-btn:focus-visible {
  background: color-mix(in srgb, var(--ink) 8%, transparent);
  outline: none;
}

/* —— Main —— */
.main {
  max-width: 440px;
  margin: 0 auto;
  padding: 0.85rem 0.85rem calc(1.5rem + var(--safe-bottom));
}

.game {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 4px);
  box-shadow: var(--shadow);
  padding: 1rem 0.9rem 1.1rem;
}

.par-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 0.75rem;
  font-size: 0.85rem;
  color: var(--ink-muted);
}

.par-label strong {
  color: var(--accent);
  font-size: 1rem;
}

/* —— Ladder —— */
.ladder {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  min-height: 8rem;
  margin-bottom: 1rem;
}

.ladder-row {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  animation: row-in 280ms ease-out;
}

.ladder-row.is-start .tile-row {
  background: var(--start-bg);
}

.ladder-row.is-target .tile {
  background: var(--target-bg);
  color: var(--target-ink);
  border-color: transparent;
}

.ladder-row.is-complete .tile {
  background: var(--changed-bg);
  border-color: var(--changed);
}

.row-label {
  width: 2.6rem;
  flex-shrink: 0;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ink-muted);
  text-align: right;
}

.tile-row {
  display: flex;
  gap: 0.28rem;
  flex: 1;
  justify-content: center;
}

.tile {
  width: 2.55rem;
  height: 2.55rem;
  border: 2px solid var(--tile-edge);
  border-radius: 8px;
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  text-transform: uppercase;
  background: var(--tile);
  transition: transform 180ms ease, background 180ms ease, border-color 180ms ease;
}

.tile.changed {
  color: var(--changed);
  background: var(--changed-bg);
  border-color: var(--changed);
  transform: translateY(-1px);
}

.gap-hint {
  text-align: center;
  color: var(--ink-muted);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  padding: 0.15rem 0;
}

/* —— Input —— */
.input-area {
  margin-bottom: 0.75rem;
}

.letter-row {
  display: flex;
  justify-content: center;
  gap: 0.28rem;
  margin-bottom: 0.55rem;
  pointer-events: none;
}

.letter-box {
  width: 2.7rem;
  height: 2.9rem;
  border: 2px solid var(--tile-edge);
  border-radius: 8px;
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.35rem;
  text-transform: uppercase;
  background: var(--tile);
}

.letter-box.filled {
  border-color: var(--ink);
}

.letter-box.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 25%, transparent);
}

.letter-box.shake {
  animation: shake 320ms ease;
}

.word-input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
  width: 1px;
  height: 1px;
}

.feedback {
  min-height: 1.25rem;
  margin: 0.35rem 0 0;
  text-align: center;
  font-size: 0.85rem;
  color: var(--danger);
}

.feedback.is-ok {
  color: var(--accent);
}

.feedback.is-warn {
  color: var(--warn);
}

/* —— Buttons —— */
.actions {
  display: grid;
  grid-template-columns: 1fr 1fr 1.2fr;
  gap: 0.45rem;
}

.actions.secondary {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.25rem 0.5rem;
  margin-top: 0.55rem;
}

.btn {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--tile);
  color: var(--ink);
  border-radius: 10px;
  padding: 0.7rem 0.5rem;
  font-family: var(--font-body);
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 120ms ease, background 120ms ease;
  position: relative;
  z-index: 1;
  min-height: 2.75rem;
  touch-action: manipulation;
}

.btn:hover:not(:disabled) {
  background: color-mix(in srgb, var(--tile) 80%, var(--ink) 8%);
}

.btn:active:not(:disabled) {
  transform: scale(0.98);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--accent);
  border-color: transparent;
  color: var(--bg);
}

[data-theme="dark"] .btn-primary {
  color: var(--bg);
}

.btn-primary:hover:not(:disabled) {
  filter: brightness(1.05);
  background: var(--accent);
}

.btn-ghost {
  background: transparent;
}

.btn-text {
  background: transparent;
  border-color: transparent;
  color: var(--ink-muted);
  font-weight: 500;
  font-size: 0.82rem;
  padding: 0.45rem 0.2rem;
}

.btn-block {
  width: 100%;
  margin-top: 0.75rem;
}

.hint-badge {
  display: inline-grid;
  place-items: center;
  min-width: 1.15rem;
  height: 1.15rem;
  padding: 0 0.25rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.7rem;
  vertical-align: middle;
}

.credit {
  text-align: center;
  margin: 1.1rem 0 0;
  font-size: 0.75rem;
  color: var(--ink-muted);
}

.credit a {
  color: var(--ink-muted);
  text-underline-offset: 0.15em;
}

/* —— Modals —— */
.modal[hidden] {
  display: none;
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  padding: 1rem;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(16, 15, 15, 0.55);
}

.modal-panel {
  position: relative;
  width: min(100%, 400px);
  max-height: min(88vh, 640px);
  overflow: auto;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: var(--shadow);
  animation: pop-in 220ms ease;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1rem 0.4rem;
  border-bottom: 1px solid var(--line);
}

.modal-header h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.25rem;
}

.modal-body {
  padding: 0.9rem 1rem 1.15rem;
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--ink);
}

.example-label {
  margin: 1rem 0 0.4rem;
  font-size: 0.82rem;
  color: var(--ink-muted);
}

.example-ladder {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.example-ladder li {
  display: flex;
  justify-content: center;
  gap: 0.25rem;
}

.ex {
  width: 1.85rem;
  height: 1.85rem;
  border: 1px solid var(--tile-edge);
  border-radius: 6px;
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
}

.ex.changed {
  color: var(--changed);
  background: var(--changed-bg);
  border-color: var(--changed);
}

.help-tips {
  margin: 1rem 0 0;
  padding-left: 1.1rem;
  color: var(--ink-muted);
  font-size: 0.88rem;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.4rem;
  text-align: center;
}

.stat-n {
  display: block;
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 700;
}

.stat-l {
  display: block;
  font-size: 0.68rem;
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.dist-title {
  margin: 1.1rem 0 0.5rem;
  font-size: 0.9rem;
}

.dist {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.dist-row {
  display: grid;
  grid-template-columns: 1.5rem 1fr 1.5rem;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
}

.dist-bar-wrap {
  height: 1.35rem;
  background: color-mix(in srgb, var(--line) 55%, transparent);
  border-radius: 4px;
  overflow: hidden;
}

.dist-bar {
  height: 100%;
  background: var(--accent);
  min-width: 0;
  border-radius: 4px;
  transition: width 400ms ease;
}

.dist-bar.is-current {
  background: var(--ink);
}

.settings-body .setting-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--line);
  font-weight: 500;
}

.setting-row select,
.setting-row input[type="checkbox"] {
  accent-color: var(--accent);
  font: inherit;
}

.setting-row select {
  background: var(--tile);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.35rem 0.5rem;
}

.setting-note {
  margin: 0.85rem 0 0;
  font-size: 0.8rem;
  color: var(--ink-muted);
}

.archive-intro {
  margin: 0 0 0.75rem;
  color: var(--ink-muted);
  font-size: 0.88rem;
}

.archive-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 50vh;
  overflow: auto;
}

.archive-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--line);
}

.archive-list button {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--tile);
  color: var(--ink);
  border-radius: 8px;
  padding: 0.35rem 0.65rem;
  font: inherit;
  font-size: 0.82rem;
  cursor: pointer;
}

.share-preview {
  margin: 0.75rem 0 0;
  padding: 0.75rem;
  background: color-mix(in srgb, var(--line) 40%, transparent);
  border-radius: 10px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.85rem;
  white-space: pre-wrap;
  line-height: 1.4;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(1.25rem + var(--safe-bottom));
  transform: translateX(-50%);
  background: var(--ink);
  color: var(--bg);
  padding: 0.65rem 1rem;
  border-radius: 999px;
  font-size: 0.88rem;
  font-weight: 500;
  z-index: 80;
  box-shadow: var(--shadow);
  animation: pop-in 180ms ease;
}

.toast[hidden] {
  display: none;
}

.ladder-row.celebrate .tile {
  animation: bounce 520ms ease;
}

.ladder-row.celebrate .tile:nth-child(2) { animation-delay: 40ms; }
.ladder-row.celebrate .tile:nth-child(3) { animation-delay: 80ms; }
.ladder-row.celebrate .tile:nth-child(4) { animation-delay: 120ms; }
.ladder-row.celebrate .tile:nth-child(5) { animation-delay: 160ms; }

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

@keyframes pop-in {
  from { opacity: 0; transform: scale(0.96) translateY(6px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-4px); }
  40% { transform: translateX(4px); }
  60% { transform: translateX(-3px); }
  80% { transform: translateX(3px); }
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  40% { transform: translateY(-6px) scale(1.04); }
  70% { transform: translateY(2px); }
}

@media (max-width: 380px) {
  .tile,
  .letter-box {
    width: 2.25rem;
    height: 2.4rem;
    font-size: 1.1rem;
  }
  .actions.secondary {
    gap: 0.2rem 0.35rem;
  }
  .stat-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}