/* ── Theme variables ──────────────────────────────────────────── */
:root {
  --bg:          #070a12;
  --surface:     rgba(17, 24, 39, 0.82);
  --surface-2:   rgba(31, 41, 55, 0.9);
  --border:      rgba(148, 163, 184, 0.24);
  --text:        #e6edf3;
  --text-2:      #c9d1d9;
  --text-muted:  #93a4b8;
  --red:         #ff4d6d;
  --red-hover:   #e83558;
  --green:       #2ee59d;
  --green-hover: #62f2b7;
  --blue:        #56ccf2;
  --orange:      #ffb457;
  --gold:        #ffd700;
  --gold-dim:    #d79b17;
  --gold-bg:     linear-gradient(145deg, #4c3300, #171003 72%);
  --gold-sel:    linear-gradient(145deg, #76520a, #251703 76%);
  --tile-sel-bg: linear-gradient(145deg, #143c63, #0f1e3c);
  --tile-val-bg: linear-gradient(145deg, #083f33, #102f22);
  --tile-inv-bg: linear-gradient(145deg, #521a28, #2c1116);
  --retro-bg:    #000;
  --overlay-bg:  rgba(7, 10, 18, 0.66);
  --shadow-deep: 0 26px 80px rgba(0, 0, 0, 0.42);
  --shadow-soft: 0 16px 38px rgba(0, 0, 0, 0.25);
  --glow-blue:   0 0 30px rgba(86, 204, 242, 0.34);
  --glow-green:  0 0 28px rgba(46, 229, 157, 0.3);
  --grid-size: min(84vw, 386px);
  --tile-size: calc((var(--grid-size) - 24px) / 5);
}

body.light {
  --bg:          #f5f7fb;
  --surface:     rgba(255, 255, 255, 0.9);
  --surface-2:   rgba(235, 241, 249, 0.92);
  --border:      rgba(35, 48, 67, 0.16);
  --text:        #1f2328;
  --text-2:      #424a53;
  --text-muted:  #57606a;
  --red:         #cf222e;
  --red-hover:   #a40e26;
  --green:       #1a7f37;
  --green-hover: #116329;
  --blue:        #0969da;
  --orange:      #bc4c00;
  --gold:        #c87800;
  --gold-dim:    #bf8700;
  --gold-bg:     #fff8e1;
  --gold-sel:    #fff0c0;
  --tile-sel-bg: linear-gradient(145deg, #e1f5ff, #f3fbff);
  --tile-val-bg: linear-gradient(145deg, #d8ffed, #f2fff8);
  --tile-inv-bg: linear-gradient(145deg, #ffe1e8, #fff4f6);
  --retro-bg:    #0d0d0d; /* retro boxes stay dark in both modes */
  --overlay-bg:  rgba(31, 35, 40, 0.55);
  --shadow-deep: 0 26px 80px rgba(49, 70, 105, 0.22);
  --shadow-soft: 0 16px 38px rgba(49, 70, 105, 0.18);
  --glow-blue:   0 0 30px rgba(9, 105, 218, 0.18);
  --glow-green:  0 0 28px rgba(26, 127, 55, 0.16);
}

/* ── Reset & base ─────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  min-height: 100%;
  background: #070a12;
}

body {
  background:
    radial-gradient(circle at 18% 12%, rgba(86, 204, 242, 0.2), transparent 28rem),
    radial-gradient(circle at 86% 24%, rgba(255, 77, 109, 0.16), transparent 24rem),
    radial-gradient(circle at 50% 95%, rgba(46, 229, 157, 0.12), transparent 26rem),
    linear-gradient(145deg, var(--bg), #111827 68%, #0b1020);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  min-height: 100dvh;
  padding: 20px 16px;
  gap: 8px;
  overflow-x: hidden;
  transition: background-color 0.25s ease, color 0.25s ease;
}
body.light {
  background:
    radial-gradient(circle at 14% 8%, rgba(9, 105, 218, 0.13), transparent 25rem),
    radial-gradient(circle at 88% 20%, rgba(188, 76, 0, 0.12), transparent 22rem),
    radial-gradient(circle at 50% 94%, rgba(26, 127, 55, 0.1), transparent 26rem),
    linear-gradient(145deg, #f8fbff, #edf3f8 70%, #f7f4ec);
}
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    linear-gradient(rgba(255,255,255,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.035) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: radial-gradient(circle at center, black, transparent 72%);
}

h1 {
  font-size: 2rem;
  font-weight: 900;
  letter-spacing: 0;
  color: var(--red);
  background: linear-gradient(90deg, var(--red), var(--orange), var(--blue), var(--green));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 10px 24px rgba(0, 0, 0, 0.28));
  text-transform: uppercase;
}

/* ── Theme toggle ─────────────────────────────────────────────── */
#theme-toggle {
  position: fixed;
  top: 12px;
  right: 12px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  width: 38px;
  height: 36px;
  display: grid;
  place-items: center;
  font-size: 1rem;
  padding: 0;
  cursor: pointer;
  z-index: 100;
  line-height: 1.4;
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(18px);
  transition: border-color 0.15s, transform 0.15s, box-shadow 0.15s;
}
#theme-toggle:hover { border-color: var(--blue); box-shadow: var(--glow-blue); }

/* ── Status row ── */
.status-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: var(--grid-size);
  font-size: 0.85rem;
  color: var(--text-muted);
}
.status-row strong { color: var(--text); font-size: 1rem; }

#mute-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-muted);
  font-size: 1rem;
  padding: 2px 8px;
  cursor: pointer;
  line-height: 1;
}
#mute-btn:hover { border-color: var(--blue); color: var(--blue); }

/* ── Progress bar (level score → target) ── */
.bar-label {
  display: flex;
  justify-content: space-between;
  width: var(--grid-size);
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 3px;
}
.bar-wrap {
  width: var(--grid-size);
  height: 10px;
  background: rgba(3, 7, 18, 0.42);
  border: 1px solid rgba(148, 163, 184, 0.12);
  border-radius: 999px;
  overflow: hidden;
  box-shadow: inset 0 2px 6px rgba(0,0,0,0.28);
}
#score-bar {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--green), var(--blue));
  width: 0%;
  transition: width 0.35s ease, background 0.4s;
}

/* ── Timer ── */
.timer-row {
  display: flex;
  align-items: center;
  gap: 10px;
  width: var(--grid-size);
}
#timer-num {
  font-size: 1.1rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  min-width: 36px;
  color: var(--green);
  transition: color 0.4s;
}
.bar-wrap.timer-bar-wrap { flex: 1; height: 8px; }
#timer-bar {
  height: 100%;
  border-radius: 999px;
  background: var(--green);
  width: 100%;
  transition: width 1s linear, background 0.4s;
}

/* ── Word display ── */
#word-display {
  height: 2.4rem;
  font-size: 1.9rem;
  font-weight: 800;
  letter-spacing: 6px;
  color: var(--orange);
  text-transform: uppercase;
  width: var(--grid-size);
  text-align: center;
  text-shadow: 0 0 18px rgba(255, 180, 87, 0.42);
}

#message {
  height: 1.2rem;
  font-size: 0.9rem;
  font-weight: 600;
  text-align: center;
  transition: opacity 0.2s;
}

/* ── Grid ── */
#grid-container {
  position: relative;
  display: none;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background:
    linear-gradient(145deg, rgba(255,255,255,0.13), rgba(255,255,255,0.02)),
    rgba(8, 13, 26, 0.58);
  box-shadow: var(--shadow-deep), inset 0 1px 0 rgba(255,255,255,0.12);
  backdrop-filter: blur(18px) saturate(1.25);
}
#grid {
  display: grid;
  grid-template-columns: repeat(5, var(--tile-size));
  grid-template-rows: repeat(5, var(--tile-size));
  gap: 6px;
  user-select: none;
  touch-action: none;
}

.tile {
  width: var(--tile-size);
  height: var(--tile-size);
  background:
    radial-gradient(circle at 32% 24%, rgba(255,255,255,0.22), transparent 32%),
    linear-gradient(145deg, rgba(30, 41, 59, 0.96), rgba(11, 18, 32, 0.98));
  border: 2px solid var(--border);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.65rem;
  font-weight: 800;
  cursor: pointer;
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.14),
    inset 0 -10px 22px rgba(0,0,0,0.22),
    0 10px 20px rgba(0,0,0,0.2);
  text-shadow: 0 2px 8px rgba(0,0,0,0.28);
  transition: background 0.12s, border-color 0.12s, color 0.12s, transform 0.12s, box-shadow 0.12s;
  color: var(--text-2);
}
body.light .tile {
  background:
    radial-gradient(circle at 32% 24%, rgba(255,255,255,0.9), transparent 34%),
    linear-gradient(145deg, #ffffff, #eaf1f8);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.9),
    inset 0 -10px 20px rgba(37, 53, 78, 0.05),
    0 10px 20px rgba(49,70,105,0.12);
}
.tile:hover {
  border-color: rgba(86, 204, 242, 0.5);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.2),
    inset 0 -10px 22px rgba(0,0,0,0.2),
    var(--glow-blue);
}
.tile.selected {
  background: var(--tile-sel-bg);
  border-color: var(--blue);
  color: var(--orange);
  transform: scale(0.9);
  box-shadow: var(--glow-blue), inset 0 0 24px rgba(86,204,242,0.18);
}
.tile.valid-flash {
  background: var(--tile-val-bg);
  border-color: var(--green);
  color: var(--green);
  transform: scale(0.9);
  box-shadow: var(--glow-green), inset 0 0 24px rgba(46,229,157,0.2);
}
.tile.invalid-flash {
  background: var(--tile-inv-bg);
  border-color: var(--red);
  color: var(--red);
  transform: scale(0.9);
  box-shadow: 0 0 28px rgba(255,77,109,0.28), inset 0 0 22px rgba(255,77,109,0.16);
}
.tile.bonus {
  background: var(--gold-bg);
  border-color: var(--gold-dim);
  color: var(--gold);
  box-shadow: 0 0 18px #d4a01755, inset 0 1px 0 rgba(255,255,255,0.22);
  animation: bonus-pulse 2s ease-in-out infinite;
}
.tile.bonus.selected {
  background: var(--gold-sel);
  border-color: var(--gold);
  color: var(--gold);
  box-shadow: 0 0 16px #d4a01766;
  transform: scale(0.9);
}
@keyframes bonus-pulse {
  0%, 100% { box-shadow: 0 0 6px #d4a01733; }
  50%       { box-shadow: 0 0 16px #d4a01799; }
}

@keyframes pop-out {
  0%   { transform: scale(0.92); opacity: 1; }
  35%  { transform: scale(1.18); opacity: 0.9; }
  100% { transform: scale(0); opacity: 0; }
}
@keyframes drop-in {
  0%   { transform: translateY(-18px); opacity: 0; }
  55%  { transform: translateY(3px); opacity: 1; }
  100% { transform: translateY(0); opacity: 1; }
}
.tile.popping  { animation: pop-out 0.26s cubic-bezier(0.4,0,0.6,1) forwards; }
.tile.dropping { animation: drop-in 0.32s ease forwards; }

/* ── SVG connector ── */
#connector-svg {
  position: absolute;
  top: 10px; left: 10px;
  width: calc(100% - 20px); height: calc(100% - 20px);
  pointer-events: none;
  overflow: visible;
}
#connector-path {
  fill: none;
  stroke: var(--blue);
  stroke-width: 5;
  stroke-linecap: round;
  stroke-linejoin: round;
  opacity: 0.72;
  filter: drop-shadow(0 0 10px rgba(86, 204, 242, 0.75));
}

/* ── Controls ── */
.controls {
  display: none;
  gap: 10px;
}
button {
  padding: 9px 20px;
  border: none;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 10px 22px rgba(0,0,0,0.16);
  transition: background 0.15s, transform 0.08s, border-color 0.15s, box-shadow 0.15s;
}
button:active { transform: scale(0.96); }
#clear-btn { background: var(--surface-2); color: var(--text); border: 1px solid var(--border); }
#clear-btn:hover { background: var(--border); }
#new-game-btn { background: var(--red); color: #fff; }
#new-game-btn:hover { background: var(--red-hover); }

/* ── Found words ── */
#found-words {
  max-width: var(--grid-size);
  text-align: center;
  min-height: 26px;
  font-size: 0.78rem;
}
#found-words span {
  display: inline-block;
  background: var(--surface);
  border: 1px solid rgba(63, 185, 80, 0.27);
  border-radius: 4px;
  padding: 2px 6px;
  margin: 2px;
  color: var(--green);
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
}

/* ── Loading ── */
#loading { font-size: 1rem; color: var(--text-muted); margin: 32px; }

/* ── Overlays ── */
.overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--overlay-bg);
  backdrop-filter: blur(12px);
  z-index: 10;
  align-items: center;
  justify-content: center;
}
.overlay.show { display: flex; }

.overlay-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 36px 48px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-width: 280px;
  box-shadow: var(--shadow-deep);
  backdrop-filter: blur(20px);
}
.overlay-box h2 { font-size: 1.8rem; font-weight: 900; letter-spacing: 4px; }
.overlay-box .big-num { font-size: 2.8rem; font-weight: 900; color: var(--blue); }
.overlay-box p { color: var(--text-muted); font-size: 0.95rem; }
.overlay-box .bonus { color: var(--green); font-weight: 700; font-size: 1.1rem; }

#level-complete-overlay h2 { color: var(--green); }
#game-over-overlay h2 { color: var(--red); }

.overlay-btn {
  margin-top: 8px;
  padding: 12px 28px;
  border: none;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: 1px;
}
#next-level-btn { background: var(--green); color: var(--bg); }
#next-level-btn:hover { background: var(--green-hover); }

/* ── Retro high-score UI (stays dark in both modes) ── */
.retro-box {
  font-family: 'Courier New', Courier, monospace;
  background: var(--retro-bg);
  border: 2px solid #3fb950;
  box-shadow: 0 0 24px #3fb95055, inset 0 0 60px #00000088;
  border-radius: 6px;
  padding: 28px 36px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  min-width: 300px;
  position: relative;
  overflow: hidden;
}
.retro-box::after {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg, transparent, transparent 3px, rgba(0,0,0,0.18) 3px, rgba(0,0,0,0.18) 4px
  );
  pointer-events: none;
}

.retro-title {
  font-size: 1.3rem;
  font-weight: 900;
  letter-spacing: 5px;
  color: #ffa657;
  text-shadow: 0 0 8px #ffa65788;
}
.retro-score-big {
  font-size: 2.6rem;
  font-weight: 900;
  color: #58a6ff;
  letter-spacing: 3px;
  text-shadow: 0 0 10px #58a6ff88;
}
.retro-sub {
  font-size: 0.8rem;
  color: #3fb950;
  letter-spacing: 3px;
}
.retro-prompt {
  font-size: 0.78rem;
  color: #8b949e;
  letter-spacing: 3px;
  margin-top: 4px;
}

/* ── Initials input ── */
#initials-input {
  font-family: 'Courier New', Courier, monospace;
  font-size: 2.2rem; /* ≥ 16px prevents iOS auto-zoom on focus */
  font-weight: 900;
  letter-spacing: 14px;
  text-indent: 14px;
  text-align: center;
  text-transform: uppercase;
  color: #ffa657;
  background: #0a0a0a;
  border: 2px solid #ffa657;
  border-radius: 6px;
  width: 168px;
  padding: 10px 8px;
  outline: none;
  caret-color: #ffa657;
}
#initials-input:focus {
  border-color: #ffd700;
  box-shadow: 0 0 12px #ffa65755;
}
#initials-input::placeholder {
  color: #444;
  letter-spacing: 14px;
  text-indent: 14px;
}

.retro-confirm-btn {
  margin-top: 6px;
  padding: 10px 32px;
  background: #3fb950;
  color: #000;
  border: none;
  border-radius: 4px;
  font-family: 'Courier New', monospace;
  font-size: 1rem;
  font-weight: 900;
  letter-spacing: 4px;
  cursor: pointer;
}
.retro-confirm-btn:hover { background: #52c76a; }

/* ── Leaderboard ── */
.lb-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  letter-spacing: 1px;
}
.lb-table td { padding: 4px 6px; }
.lb-table .lb-rank { color: #8b949e; text-align: right; width: 22px; }
.lb-table .lb-name { color: #e6edf3; font-weight: 900; font-size: 1rem; width: 44px; }
.lb-table .lb-pts  { color: #58a6ff; text-align: right; min-width: 70px; }
.lb-table .lb-lvl  { color: #8b949e; font-size: 0.75rem; padding-left: 8px; }
.lb-table tr.lb-new td { color: #ffa657 !important; }
.lb-table tr.lb-new .lb-name { text-shadow: 0 0 6px #ffa65799; }
.lb-divider { border: none; border-top: 1px solid #3fb95033; margin: 4px 0; }

.retro-play-btn {
  padding: 10px 28px;
  background: #f85149;
  color: #fff;
  border: none;
  border-radius: 4px;
  font-family: 'Courier New', monospace;
  font-size: 0.95rem;
  font-weight: 900;
  letter-spacing: 3px;
  cursor: pointer;
}
.retro-play-btn:hover { background: #da3633; }

.retro-btn-secondary {
  background: #21262d !important;
  border: 1px solid #30363d !important;
  color: #e6edf3 !important;
}
.retro-btn-secondary:hover { background: #30363d !important; }

#hs-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-muted);
  font-size: 0.8rem;
  padding: 4px 8px;
  cursor: pointer;
  letter-spacing: 1px;
}
#hs-btn:hover { border-color: var(--orange); color: var(--orange); }

/* ── Screen panels ── */
#intro-screen, #game-screen {
  display: none;
  flex-direction: column;
  align-items: center;
  width: 100%;
  gap: 12px;
}
#intro-screen.active, #game-screen.active { display: flex; }

/* ── Intro screen ── */
#intro-screen { max-width: 420px; margin: 0 auto; }
#intro-screen h1 { margin-bottom: 4px; }
.intro-sub {
  font-size: 0.78rem;
  letter-spacing: 4px;
  color: var(--text-muted);
  margin-top: -8px;
}
.rules-box {
  width: 100%;
  max-width: var(--grid-size);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px 22px;
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(18px);
  transition: background-color 0.25s, border-color 0.25s;
}
.rules-section-title {
  font-size: 0.72rem;
  letter-spacing: 4px;
  color: var(--text-muted);
  margin-bottom: 12px;
}
.rules-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 9px;
}
.rules-list li {
  font-size: 0.88rem;
  color: var(--text-2);
  padding-left: 18px;
  position: relative;
  line-height: 1.4;
}
.rules-list li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--blue);
}
.rules-list li strong { color: var(--text); }
.scoring-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 7px 20px;
  font-size: 0.88rem;
}
.scoring-grid .sc-lbl { color: var(--text-2); }
.scoring-grid .sc-pts { color: var(--blue); font-weight: 700; text-align: right; }
.gold-text { color: var(--gold); }
.intro-btns {
  display: flex;
  gap: 12px;
  width: 100%;
  max-width: var(--grid-size);
  justify-content: center;
  padding-bottom: 8px;
}
.btn-intro-hs {
  padding: 12px 22px;
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 2px;
  cursor: pointer;
}
.btn-intro-hs:hover { background: var(--border); }
.btn-play {
  flex: 1;
  max-width: 200px;
  padding: 13px 24px;
  background: linear-gradient(135deg, var(--red), #b737ff 46%, var(--blue));
  color: #fff;
  border: none;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 3px;
  cursor: pointer;
}
.btn-play:hover { box-shadow: var(--glow-blue), 0 14px 26px rgba(255,77,109,0.22); }
.btn-play:active { transform: scale(0.97); }

@media (max-width: 430px) {
  body { padding: 16px 10px; }
  h1 { font-size: 1.55rem; }
  #word-display { font-size: 1.45rem; letter-spacing: 4px; }
  .tile { font-size: 1.35rem; border-radius: 12px; }
  .rules-box { padding: 16px 18px; }
  .intro-btns, .controls { gap: 8px; }
  button { padding: 9px 14px; }
}