@import url("https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,500;9..144,650&family=IBM+Plex+Mono:wght@400;500;600&family=IBM+Plex+Sans:wght@400;500;600;700&display=swap");

:root {
  --su-bg: #0c1118;
  --su-bg-2: #121a24;
  --su-elev: #17202c;
  --su-elev-2: #1c2735;
  --su-border: #2a384a;
  --su-border-strong: #3d5168;
  --su-text: #e8eef6;
  --su-muted: #8b9bb0;
  --su-faint: #66758a;
  --su-gold: #e0b84e;
  --su-gold-deep: #c4922a;
  --su-gold-soft: rgba(224, 184, 78, 0.16);
  --su-teal: #5ec8c5;
  --su-teal-soft: rgba(94, 200, 197, 0.14);
  --su-ok: #3dd68c;
  --su-ok-soft: rgba(61, 214, 140, 0.14);
  --su-danger: #f07178;
  --su-danger-soft: rgba(240, 113, 120, 0.14);
  --su-paper: #efe6d4;
  --su-paper-2: #e5d9c0;
  --su-ink: #1c1812;
  --su-ink-muted: #6d6354;
  --su-shadow: 0 22px 50px rgba(0, 0, 0, 0.42);
  --su-radius: 16px;
  --su-sans: "IBM Plex Sans", "Segoe UI", sans-serif;
  --su-mono: "IBM Plex Mono", ui-monospace, monospace;
  --su-serif: "Fraunces", Georgia, serif;
}

html.su-standalone,
html.su-standalone body {
  margin: 0;
  height: 100%;
  background: var(--su-bg);
  color: var(--su-text);
  font-family: var(--su-sans);
  color-scheme: dark;
}

html.su-standalone body {
  background:
    radial-gradient(1000px 480px at 8% -10%, rgba(224, 184, 78, 0.12), transparent 55%),
    radial-gradient(800px 420px at 100% 0%, rgba(94, 200, 197, 0.08), transparent 50%),
    var(--su-bg);
}

html.su-standalone #su-root {
  height: 100%;
  height: 100dvh;
}

.su-page-wrap {
  padding-top: 8rem;
  padding-bottom: 4rem;
  min-height: 100vh;
  background:
    radial-gradient(1000px 480px at 8% -10%, rgba(224, 184, 78, 0.08), transparent 55%),
    radial-gradient(800px 420px at 100% 0%, rgba(94, 200, 197, 0.05), transparent 50%),
    transparent;
}

.dark .su-page-wrap {
  background:
    radial-gradient(1000px 480px at 8% -10%, rgba(224, 184, 78, 0.1), transparent 55%),
    radial-gradient(800px 420px at 100% 0%, rgba(94, 200, 197, 0.06), transparent 50%),
    transparent;
}

.su-page-wrap #su-root {
  max-width: 980px;
  margin: 0 auto;
}

.su-app {
  min-height: 100%;
  display: flex;
  flex-direction: column;
  color: var(--su-text);
  font-family: var(--su-sans);
  position: relative;
}

.su-page-wrap .su-app {
  min-height: auto;
  height: auto;
  background: var(--su-bg);
  border: 1px solid var(--su-border);
  border-radius: var(--su-radius);
  box-shadow: var(--su-shadow);
  overflow: hidden;
}

.su-page-wrap .su-view {
  overflow: visible;
  flex: none;
}

html.su-standalone .su-app {
  height: 100%;
  overflow: hidden;
}

html.su-standalone .su-view {
  overflow: auto;
  flex: 1;
  min-height: 0;
}

* {
  box-sizing: border-box;
}

button,
input,
textarea,
select {
  font-family: inherit;
}

button {
  cursor: pointer;
}

.su-mono { font-family: var(--su-mono); }

/* ---------- Header ---------- */
.su-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 18px;
  border-bottom: 1px solid var(--su-border);
  background: rgba(12, 17, 24, 0.92);
  backdrop-filter: blur(16px);
  flex-shrink: 0;
}

.su-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.su-mark {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  background: linear-gradient(145deg, var(--su-gold), var(--su-gold-deep));
  color: #1a1408;
  font-family: var(--su-mono);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.02em;
  flex-shrink: 0;
  box-shadow: 0 6px 16px rgba(224, 184, 78, 0.28);
}

.su-brand-text {
  min-width: 0;
}

.su-brand h1 {
  margin: 0;
  font-family: var(--su-serif);
  font-size: 1.15rem;
  font-weight: 650;
  letter-spacing: 0.02em;
  line-height: 1.1;
}

.su-brand p {
  margin: 2px 0 0;
  font-size: 12px;
  color: var(--su-muted);
}

.su-header-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
}

.su-icon-btn {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  border: 1px solid var(--su-border);
  background: var(--su-elev);
  color: var(--su-text);
  display: grid;
  place-items: center;
  transition: transform 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.su-icon-btn:hover {
  transform: translateY(-1px);
  border-color: var(--su-gold);
  background: var(--su-elev-2);
}

.su-icon-btn svg {
  width: 18px;
  height: 18px;
}

/* ---------- Views ---------- */
.su-view {
  flex: 1;
  min-height: 0;
  overflow: auto;
  padding: 22px 18px 28px;
}

/* ---------- Splash ---------- */
.su-splash {
  max-width: 680px;
  margin: 0 auto;
}

.su-hero {
  text-align: center;
  margin-bottom: 28px;
}

.su-hero h2 {
  font-family: var(--su-serif);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 650;
  margin: 0 0 10px;
  letter-spacing: -0.02em;
}

.su-hero p {
  margin: 0 auto;
  max-width: 46ch;
  color: var(--su-muted);
  line-height: 1.55;
  font-size: 15px;
}

.su-stats-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin: 22px 0 26px;
}

.su-stat {
  background: var(--su-elev);
  border: 1px solid var(--su-border);
  border-radius: 12px;
  padding: 12px 10px;
  text-align: center;
}

.su-stat b {
  display: block;
  font-variant-numeric: tabular-nums;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--su-gold);
}

.su-stat span {
  display: block;
  margin-top: 3px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--su-faint);
}

.su-play-grid {
  display: grid;
  gap: 12px;
}

.su-play-card {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  width: 100%;
  text-align: left;
  padding: 16px 18px;
  border-radius: 14px;
  border: 1px solid var(--su-border);
  background: linear-gradient(180deg, var(--su-elev), var(--su-bg-2));
  color: inherit;
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

.su-play-card:hover {
  transform: translateY(-2px);
  border-color: var(--su-gold);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.25);
}

.su-play-card.primary {
  border-color: rgba(224, 184, 78, 0.45);
  background:
    linear-gradient(135deg, var(--su-gold-soft), transparent 55%),
    linear-gradient(180deg, var(--su-elev), var(--su-bg-2));
}

.su-play-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: var(--su-gold-soft);
  color: var(--su-gold);
  flex-shrink: 0;
}

.su-play-card:not(.primary) .su-play-icon {
  background: var(--su-teal-soft);
  color: var(--su-teal);
}

.su-play-icon svg { width: 20px; height: 20px; }

.su-play-card strong {
  display: block;
  font-size: 16px;
  margin-bottom: 3px;
}

.su-play-card span {
  display: block;
  font-size: 13px;
  color: var(--su-muted);
  line-height: 1.4;
}

.su-play-card em {
  display: block;
  margin-top: 6px;
  font-style: normal;
  font-size: 12px;
  font-weight: 700;
  color: var(--su-ok);
}

.su-diff {
  margin-top: 22px;
}

.su-diff-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--su-faint);
  margin-bottom: 8px;
}

.su-seg {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  background: var(--su-bg-2);
  border: 1px solid var(--su-border);
  border-radius: 12px;
  padding: 6px;
}

.su-seg button {
  border: 0;
  background: transparent;
  color: var(--su-muted);
  font-weight: 650;
  font-size: 13px;
  padding: 10px 8px;
  border-radius: 8px;
}

.su-seg button.active {
  background: var(--su-elev-2);
  color: var(--su-text);
  box-shadow: 0 0 0 1px var(--su-border-strong);
}

.su-seg button small {
  display: block;
  font-weight: 500;
  font-size: 11px;
  color: var(--su-faint);
  margin-top: 2px;
}

.su-how {
  margin-top: 18px;
  width: 100%;
  border: 0;
  background: transparent;
  color: var(--su-teal);
  font-weight: 650;
  font-size: 14px;
  padding: 8px;
}

.su-how:hover { text-decoration: underline; }

/* ---------- Play HUD ---------- */
.su-hud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: stretch;
  margin-bottom: 14px;
}

.su-hud-item {
  background: var(--su-elev);
  border: 1px solid var(--su-border);
  border-radius: 12px;
  padding: 8px 14px;
  min-width: 86px;
}

.su-hud-item .lbl {
  display: block;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--su-faint);
}

.su-hud-item .val {
  display: block;
  margin-top: 1px;
  font-size: 18px;
  font-weight: 750;
  font-variant-numeric: tabular-nums;
}

.su-hud-item .val.pop { animation: su-pop 0.28s ease; }

@keyframes su-pop {
  40% { transform: scale(1.18); color: var(--su-ok); }
}

.su-toolbar {
  margin-left: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.su-btn {
  border: 1px solid var(--su-border);
  background: var(--su-elev);
  color: var(--su-text);
  border-radius: 10px;
  padding: 8px 12px;
  font-size: 13px;
  font-weight: 650;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}

.su-btn:hover {
  border-color: var(--su-border-strong);
  background: var(--su-elev-2);
}

.su-btn:disabled {
  opacity: 0.45;
  cursor: default;
}

.su-btn.gold {
  background: linear-gradient(180deg, var(--su-gold), var(--su-gold-deep));
  border-color: transparent;
  color: #1a1408;
}

.su-btn.gold:hover { filter: brightness(1.05); }

.su-btn.ghost {
  background: transparent;
  color: var(--su-muted);
}

.su-btn.ghost:hover { color: var(--su-danger); border-color: var(--su-danger); }

.su-btn.active {
  border-color: var(--su-gold);
  background: var(--su-gold-soft);
  color: var(--su-gold);
}

.su-btn svg { width: 15px; height: 15px; }

/* ---------- Puzzle paper ---------- */
.su-play-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  justify-items: center;
}

.su-paper {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.35), transparent 28%),
    var(--su-paper);
  color: var(--su-ink);
  border-radius: 16px;
  padding: 18px;
  box-shadow: var(--su-shadow);
  outline: none;
  width: min(100%, 520px);
}

.su-paper:focus { box-shadow: var(--su-shadow), 0 0 0 2px rgba(224, 184, 78, 0.35); }

.su-board {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  grid-template-rows: repeat(3, minmax(0, 1fr));
  width: 100%;
  aspect-ratio: 1;
  border: 3px solid #2c261c;
  background: #2c261c;
  gap: 3px;
}

.su-box {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  grid-template-rows: repeat(3, minmax(0, 1fr));
  gap: 1px;
  min-width: 0;
  min-height: 0;
  height: 100%;
  background: #2c261c;
}

.su-cell {
  position: relative;
  display: grid;
  place-items: center;
  min-width: 0;
  min-height: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--su-paper);
  border: 0;
  padding: 0;
  color: var(--su-ink);
  font-family: var(--su-mono);
  font-size: clamp(1rem, 4.2vw, 1.55rem);
  font-weight: 600;
  line-height: 1;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
}

.su-cell.peer { background: #e4d6b4; }
.su-cell.same { background: rgba(196, 146, 42, 0.22); }
.su-cell.selected { background: rgba(196, 146, 42, 0.42); }
.su-cell.given { color: #1d6b58; font-weight: 700; }
.su-cell.conflict,
.su-cell.wrong { color: #b42318; }
.su-cell.given.conflict { color: #b42318; }

.su-cell-notes {
  position: absolute;
  inset: 3px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  pointer-events: none;
}

.su-cell-notes span {
  display: grid;
  place-items: center;
  font-size: 0.42em;
  font-weight: 600;
  color: var(--su-ink-muted);
  line-height: 1;
}

.su-cell-notes span.on { color: #3a4f6b; }

/* ---------- Helpers / keypad ---------- */
.su-helpers {
  width: min(100%, 520px);
  display: grid;
  gap: 12px;
}

.su-panel {
  background: var(--su-elev);
  border: 1px solid var(--su-border);
  border-radius: 14px;
  padding: 12px 14px;
}

.su-panel h3 {
  margin: 0 0 8px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--su-faint);
}

.su-pad {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 6px;
}

.su-pad button {
  height: 44px;
  border-radius: 10px;
  border: 1px solid var(--su-border);
  background: var(--su-bg-2);
  color: var(--su-text);
  font-family: var(--su-mono);
  font-weight: 650;
  font-size: 16px;
}

.su-pad button:hover {
  border-color: var(--su-gold);
  background: var(--su-elev-2);
}

.su-pad button.used {
  color: var(--su-faint);
  background: transparent;
}

.su-pad button.selected {
  border-color: var(--su-gold);
  background: var(--su-gold-soft);
  color: var(--su-gold);
}

.su-pad button.wide {
  font-size: 12px;
}

.su-hint {
  margin-top: 10px;
  font-size: 12px;
  color: var(--su-muted);
  text-align: center;
}

/* ---------- Overlay ---------- */
.su-overlay {
  position: absolute;
  inset: 0;
  background: rgba(8, 12, 18, 0.72);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 20;
}

.su-modal {
  width: min(440px, 100%);
  background: var(--su-elev);
  border: 1px solid var(--su-border);
  border-radius: 18px;
  padding: 26px 22px 20px;
  box-shadow: var(--su-shadow);
  text-align: center;
}

.su-modal h2 {
  font-family: var(--su-serif);
  margin: 0 0 8px;
  font-size: 1.7rem;
}

.su-win-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin: 16px 0;
}

.su-win-stats div {
  background: var(--su-bg-2);
  border-radius: 10px;
  padding: 10px 6px;
}

.su-win-stats b { display: block; font-size: 1.1rem; }
.su-win-stats span { font-size: 11px; color: var(--su-muted); }

.su-modal p {
  color: var(--su-muted);
  font-size: 14px;
  line-height: 1.55;
  text-align: left;
}

.su-modal ol {
  text-align: left;
  color: var(--su-muted);
  font-size: 14px;
  line-height: 1.55;
  padding-left: 1.2rem;
  list-style: decimal;
}

.su-modal-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-top: 16px;
}

.su-toast {
  position: absolute;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%) translateY(12px);
  background: var(--su-elev-2);
  border: 1px solid var(--su-border-strong);
  color: var(--su-text);
  padding: 10px 16px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 650;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 30;
}

.su-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.su-generating {
  color: var(--su-muted);
  text-align: center;
  padding: 48px 16px;
  font-size: 15px;
}

@media (max-width: 720px) {
  .su-stats-row { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .su-header { padding: 10px 12px; }
  .su-view { padding: 16px 12px 20px; }
  .su-toolbar { margin-left: 0; width: 100%; }
  .su-hud-item { min-width: 72px; padding: 7px 10px; }
  .su-seg { grid-template-columns: repeat(2, 1fr); }
  .su-paper { padding: 10px; }
}

@media (max-width: 420px) {
  .su-pad { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .su-pad button { height: 40px; font-size: 14px; }
}