:root {
  --bg: #0f0f0f;
  --surface: #1a1a1a;
  --surface-hover: #252525;
  --surface-selected: #3a3a3a;
  --text: #e8e4df;
  --text-dim: #8a8580;
  --text-muted: #706b66;
  --border: #2a2a2a;
  --green: #4a9e6f;
  --green-bg: #1a3328;
  --yellow: #c4a84a;
  --yellow-bg: #33291a;
  --blue: #4a7ec4;
  --blue-bg: #1a2533;
  --red: #c45a5a;
  --red-bg: #331a1a;
  --accent: #d4a853;
  --shake-color: #c45a5a;
}

* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

body {
  font-family: 'Noto Sans Tamil', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  overflow-x: hidden;
}

/* Header */
.header {
  width: 100%;
  max-width: 500px;
  padding: 16px 20px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
}
.header-left { display: flex; align-items: baseline; gap: 10px; }
.logo {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--accent);
}
.puzzle-number { font-size: 14px; color: var(--text-dim); font-weight: 500; }
.header-right { display: flex; align-items: center; gap: 12px; }

/* Game container */
.game-container {
  width: 100%;
  max-width: 500px;
  padding: 16px 16px 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow-x: hidden;
}

/* Solved groups */
.solved-groups { display: flex; flex-direction: column; gap: 8px; margin-bottom: 8px; }
.solved-group {
  border-radius: 12px;
  padding: 14px 16px;
  text-align: center;
  animation: groupReveal 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  will-change: transform, opacity;
}
.solved-group.diff-1 { background: var(--green-bg); border: 1px solid var(--green); }
.solved-group.diff-2 { background: var(--yellow-bg); border: 1px solid var(--yellow); }
.solved-group.diff-3 { background: var(--blue-bg); border: 1px solid var(--blue); }
.solved-group.diff-4 { background: var(--red-bg); border: 1px solid var(--red); }
.solved-category {
  font-size: 13px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 4px;
}
.diff-1 .solved-category { color: var(--green); }
.diff-2 .solved-category { color: var(--yellow); }
.diff-3 .solved-category { color: var(--blue); }
.diff-4 .solved-category { color: var(--red); }
.solved-words { font-size: 17px; font-weight: 500; color: var(--text); line-height: 1.5; overflow-wrap: break-word; }
.solved-explanation { font-size: 12px; color: var(--text-dim); margin-top: 4px; }

/* Grid */
.grid-scroll-wrapper {
  overflow-x: hidden;
  margin-bottom: 16px;
}
.grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  max-width: 100%;
}
.cell {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 14px 6px;
  text-align: center;
  cursor: pointer;
  font-family: 'Noto Sans Tamil', sans-serif;
  font-size: clamp(12px, 3.8vw, 16px);
  font-weight: 600;
  color: var(--text);
  user-select: none;
  min-width: 0;
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1.3;
  white-space: nowrap;
  overflow: hidden;
  will-change: transform;
  transition: background 0.15s, border-color 0.15s, color 0.15s, transform 0.15s;
}
.cell:hover { background: var(--surface-hover); }

/* Select pop animation */
@keyframes selectPop {
  0%   { transform: scale(1); }
  50%  { transform: scale(0.92); }
  100% { transform: scale(0.96); }
}
.cell.selected {
  background: var(--surface-selected);
  border-color: var(--accent);
  color: var(--accent);
  animation: selectPop 200ms cubic-bezier(0.34, 1.56, 0.64, 1);
  transform: scale(0.96);
}

/* Deselect settle animation */
@keyframes deselectSettle {
  0%   { transform: scale(0.96); }
  50%  { transform: scale(1.02); }
  100% { transform: scale(1); }
}
.cell.deselecting {
  animation: deselectSettle 150ms ease-out;
}

/* Ready pulse — 4th word golden glow */
@keyframes readyPulse {
  0%   { box-shadow: 0 0 0 0 rgba(212, 168, 83, 0.4); }
  70%  { box-shadow: 0 0 0 8px rgba(212, 168, 83, 0); }
  100% { box-shadow: 0 0 0 0 rgba(212, 168, 83, 0); }
}
.cell.selected.ready-group {
  animation: selectPop 200ms cubic-bezier(0.34, 1.56, 0.64, 1), readyPulse 600ms ease-out;
}

/* Cell collapsing (before group reveal) */
@keyframes cellCollapse {
  0%   { transform: scale(0.96); opacity: 1; }
  100% { transform: scale(0.5); opacity: 0; }
}
.cell.collapsing {
  animation: cellCollapse 150ms ease-in forwards;
  pointer-events: none;
}

/* Near miss glow on one-away */
@keyframes nearMissGlow {
  0%   { box-shadow: none; }
  50%  { box-shadow: 0 0 12px rgba(212, 168, 83, 0.3); }
  100% { box-shadow: none; }
}
.cell.near-miss {
  animation: nearMissGlow 800ms ease-out;
}

.cell.shake {
  animation: shake 0.5s ease-in-out !important;
}

/* Defeat fade */
@keyframes defeatFade {
  0%   { opacity: 1; filter: saturate(1); }
  100% { opacity: 0.4; filter: saturate(0); }
}
.cell.defeated {
  animation: defeatFade 200ms ease-out forwards;
  pointer-events: none;
}

/* FLIP shuffle transition */
.cell.flip-animate {
  transition: transform 200ms ease-out;
}

/* Mistake dots */
.mistakes-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 0;
  font-size: 13px;
  color: var(--text-dim);
}
.mistakes-dots { display: flex; gap: 5px; }
.dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--text-dim);
  transition: all 0.3s;
  will-change: transform, opacity, background-color;
}
.dot.used { background: var(--shake-color); opacity: 0.4; transform: scale(0.7); }

/* Dot lost animation */
@keyframes dotLost {
  0%   { transform: scale(1); background: var(--text-dim); }
  40%  { transform: scale(1.5); background: var(--shake-color); }
  100% { transform: scale(0.7); background: var(--shake-color); opacity: 0.4; }
}
.dot.just-used {
  animation: dotLost 400ms ease-out forwards;
}

/* Last life pulse */
@keyframes lastLifePulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%      { opacity: 0.7; transform: scale(1.15); }
}
.dot.last-remaining {
  animation: lastLifePulse 2s ease-in-out infinite;
}

/* Color wash on correct group */
@keyframes colorWash-1 {
  0%   { background-color: transparent; }
  30%  { background-color: rgba(74, 158, 111, 0.08); }
  100% { background-color: transparent; }
}
@keyframes colorWash-2 {
  0%   { background-color: transparent; }
  30%  { background-color: rgba(196, 168, 74, 0.08); }
  100% { background-color: transparent; }
}
@keyframes colorWash-3 {
  0%   { background-color: transparent; }
  30%  { background-color: rgba(74, 126, 196, 0.08); }
  100% { background-color: transparent; }
}
@keyframes colorWash-4 {
  0%   { background-color: transparent; }
  30%  { background-color: rgba(196, 90, 90, 0.08); }
  100% { background-color: transparent; }
}
.game-container.color-wash-1 { animation: colorWash-1 500ms ease-out; }
.game-container.color-wash-2 { animation: colorWash-2 500ms ease-out; }
.game-container.color-wash-3 { animation: colorWash-3 500ms ease-out; }
.game-container.color-wash-4 { animation: colorWash-4 500ms ease-out; }

/* Buttons */
.actions {
  display: flex;
  gap: 10px;
  justify-content: center;
  padding-top: 4px;
}
.btn {
  font-family: 'Noto Sans Tamil', sans-serif;
  font-size: 15px;
  font-weight: 600;
  padding: 12px 28px;
  border-radius: 50px;
  border: none;
  cursor: pointer;
  transition: all 0.15s;
  display: flex; align-items: center; gap: 6px;
}
.btn:disabled { opacity: 0.3; cursor: default; }
.btn-secondary {
  background: var(--surface);
  color: var(--text-dim);
  border: 1px solid var(--border);
}
.btn-secondary:hover:not(:disabled) { background: var(--surface-hover); color: var(--text); }
.btn-primary {
  background: var(--accent);
  color: #0f0f0f;
}
.btn-primary:hover:not(:disabled) { background: #e0b45e; }

/* Share section */
.share-section { margin-top: 4px; }
.share-section-animated { opacity:0; transform:scale(0.85); animation:shareButtonIn 0.4s cubic-bezier(0.34,1.56,0.64,1) forwards; }
.share-buttons-row { display:flex; gap:10px; justify-content:center; flex-wrap:wrap; max-width:320px; margin:0 auto; }
.btn-share {
  width:100%; max-width:280px; background:var(--accent); color:#0f0f0f;
  font-family:'Noto Sans Tamil',sans-serif; font-size:15px; font-weight:600;
  padding:12px 20px; border-radius:50px; border:none; cursor:pointer;
  min-height:44px; display:flex; align-items:center; justify-content:center;
  gap:6px; transition:all 0.15s; margin:0 auto;
}
.btn-share:hover { background:#e0b45e; }
.comparison-box {
  background:var(--bg); border-left:3px solid var(--accent); border-radius:12px;
  padding:14px 16px; margin-bottom:16px; text-align:center;
}
.comparison-result { font-size:15px; font-weight:600; }

/* Toast */
.toast-container {
  position: fixed;
  top: 80px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 100;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}
.toast {
  background: var(--text);
  color: var(--bg);
  padding: 10px 24px;
  border-radius: 50px;
  font-size: 14px;
  font-weight: 600;
  animation: toastIn 0.3s ease, toastOut 0.3s ease 1.5s forwards;
  white-space: nowrap;
  max-width: calc(100vw - 32px);
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Game Over / Win overlay */
.overlay {
  position: fixed; inset: 0;
  background: rgba(15,15,15,0.92);
  z-index: 50;
  display: flex; align-items: flex-start; justify-content: center;
  animation: fadeIn 0.3s ease;
  padding: 20px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}
.overlay-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 32px 28px;
  max-width: 400px;
  width: 100%;
  text-align: center;
  animation: slideUp 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  margin: auto 0;
  flex-shrink: 0;
}
.overlay-title { font-size: 22px; font-weight: 800; margin-bottom: 6px; }
.overlay-subtitle { font-size: 14px; color: var(--text-dim); margin-bottom: 20px; }
.overlay-groups { text-align: left; margin-bottom: 24px; display: flex; flex-direction: column; gap: 10px; }
.overlay-group { padding: 12px 14px; border-radius: 10px; }
.overlay-group.diff-1 { background: var(--green-bg); border: 1px solid var(--green); }
.overlay-group.diff-2 { background: var(--yellow-bg); border: 1px solid var(--yellow); }
.overlay-group.diff-3 { background: var(--blue-bg); border: 1px solid var(--blue); }
.overlay-group.diff-4 { background: var(--red-bg); border: 1px solid var(--red); }
.overlay-group-cat { font-size: 12px; font-weight: 700; letter-spacing: 0.5px; text-transform: uppercase; }
.overlay-group.diff-1 .overlay-group-cat { color: var(--green); }
.overlay-group.diff-2 .overlay-group-cat { color: var(--yellow); }
.overlay-group.diff-3 .overlay-group-cat { color: var(--blue); }
.overlay-group.diff-4 .overlay-group-cat { color: var(--red); }
.overlay-group-words { font-size: 15px; color: var(--text); margin-top: 3px; }
.overlay-group-explain { font-size: 11px; color: var(--text-dim); margin-top: 2px; }
.overlay-group.missed { opacity: 0.55; filter: saturate(0.4); }
.overlay-close { position:absolute; top:12px; right:12px; background:none; border:none; color:var(--text-muted); font-size:20px; cursor:pointer; padding:8px; line-height:1; border-radius:50%; transition:color 0.15s,background 0.15s; z-index:1; }
.overlay-close:hover { color:var(--text); background:var(--surface-hover); }
.overlay-actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.overlay-actions .btn-share { width:100%; max-width:280px; justify-content:center; font-size:16px; padding:14px 28px; }
.share-preview {
  background: var(--bg);
  border-radius: 10px;
  padding: 14px 20px;
  margin-bottom: 20px;
  font-size: 14px;
  line-height: 1.6;
  text-align: left;
  font-family: monospace, 'Noto Sans Tamil';
  white-space: pre-wrap;
  overflow-wrap: break-word;
  color: var(--text);
}

/* Stats in overlay */
.overlay-stats {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 20px;
}
.stat-item {
  text-align: center;
}
.stat-value {
  font-size: 24px;
  font-weight: 800;
  color: var(--accent);
}
.stat-label {
  font-size: 11px;
  color: var(--text-dim);
  margin-top: 2px;
}

/* Confetti particle */
.confetti-particle {
  position: fixed;
  width: 8px;
  height: 8px;
  pointer-events: none;
  z-index: 200;
}

/* Victory bounce for solved groups (imperfect win) */
@keyframes bounceCard {
  0%   { transform: translateY(0); }
  40%  { transform: translateY(-4px); }
  100% { transform: translateY(0); }
}
.solved-group.bounce-card {
  animation: bounceCard 300ms ease-out;
}

/* Yesterday banner */
.yesterday-banner {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  margin-bottom: 12px;
  overflow: hidden;
  cursor: pointer;
  transition: all 0.2s;
}
.yesterday-banner:hover {
  border-color: var(--text-muted);
}
.yesterday-banner-summary {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 8px;
  justify-content: space-between;
}
.yesterday-banner-summary .label {
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
}
.yesterday-banner-summary .dots {
  display: flex;
  gap: 4px;
}
.yesterday-banner-summary .dots .yd {
  width: 10px;
  height: 10px;
  border-radius: 3px;
}
.yesterday-banner-summary .dots .yd.d1 { background: var(--green); }
.yesterday-banner-summary .dots .yd.d2 { background: var(--yellow); }
.yesterday-banner-summary .dots .yd.d3 { background: var(--blue); }
.yesterday-banner-summary .dots .yd.d4 { background: var(--red); }
.yesterday-banner-summary .chevron {
  font-size: 12px;
  transition: transform 0.2s;
}
.yesterday-banner.expanded .yesterday-banner-summary .chevron {
  transform: rotate(180deg);
}
.yesterday-banner-detail {
  display: none;
  padding: 0 14px 14px;
}
.yesterday-banner.expanded .yesterday-banner-detail {
  display: block;
}
.yesterday-banner-detail .yb-group {
  padding: 8px 10px;
  border-radius: 8px;
  margin-top: 8px;
}
.yesterday-banner-detail .yb-group.diff-1 { background: var(--green-bg); border: 1px solid var(--green); }
.yesterday-banner-detail .yb-group.diff-2 { background: var(--yellow-bg); border: 1px solid var(--yellow); }
.yesterday-banner-detail .yb-group.diff-3 { background: var(--blue-bg); border: 1px solid var(--blue); }
.yesterday-banner-detail .yb-group.diff-4 { background: var(--red-bg); border: 1px solid var(--red); }
.yesterday-banner-detail .yb-cat {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.yb-group.diff-1 .yb-cat { color: var(--green); }
.yb-group.diff-2 .yb-cat { color: var(--yellow); }
.yb-group.diff-3 .yb-cat { color: var(--blue); }
.yb-group.diff-4 .yb-cat { color: var(--red); }
.yesterday-banner-detail .yb-words {
  font-size: 13px;
  color: var(--text);
  margin-top: 2px;
}
.yesterday-banner-detail .yb-explain {
  font-size: 11px;
  color: var(--text-dim);
  margin-top: 2px;
}
.yesterday-banner .dismiss-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 16px;
  cursor: pointer;
  padding: 4px;
  line-height: 1;
}
.yesterday-banner .dismiss-btn:hover {
  color: var(--text);
}

/* Milestone celebration overlay */
.milestone-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 15, 15, 0.88);
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.3s ease;
  cursor: pointer;
}
.milestone-content {
  text-align: center;
  animation: slideUp 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.milestone-emoji {
  font-size: 48px;
  margin-bottom: 12px;
}
.milestone-text {
  font-size: 24px;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 8px;
}
.milestone-streak {
  font-size: 14px;
  color: var(--text-dim);
}

/* Welcome back banner */
.welcome-back {
  background: var(--surface);
  border: 1px solid var(--accent);
  border-radius: 12px;
  padding: 14px 16px;
  margin-bottom: 12px;
  text-align: center;
  animation: slideUp 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  cursor: pointer;
}
.welcome-back-text {
  font-size: 15px;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 4px;
}
.welcome-back-sub {
  font-size: 13px;
  color: var(--text-dim);
}

/* ============ NO-PUZZLE SCREEN (REDESIGNED) ============ */

.no-puzzle {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-dim);
  font-size: 16px;
  line-height: 1.6;
}
.no-puzzle .emoji {
  font-size: 48px;
  margin-bottom: 12px;
}

.np-tagline {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 24px;
}

/* Countdown */
.np-countdown-section {
  margin: 24px 0;
}
.np-countdown-label {
  font-size: 13px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}
.np-countdown-timer {
  font-size: 36px;
  font-weight: 700;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  letter-spacing: 2px;
}

/* Stats row */
.np-stats {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  margin: 20px 0;
  padding: 12px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.np-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}
.np-stat-value {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
}
.np-stat-label {
  font-size: 11px;
  color: var(--text-muted);
}
.np-stat-sep {
  color: var(--text-muted);
  font-size: 18px;
}

/* Yesterday's answers in no-puzzle */
.np-yesterday {
  margin: 20px 0;
  text-align: left;
}
.np-yesterday-header {
  font-size: 13px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 12px;
  text-align: center;
}
.np-ygroup {
  padding: 8px 12px;
  margin-bottom: 6px;
  border-radius: 8px;
  border-left: 3px solid;
}
.np-ygroup.diff-1 { border-color: var(--green); background: var(--green-bg); }
.np-ygroup.diff-2 { border-color: var(--yellow); background: var(--yellow-bg); }
.np-ygroup.diff-3 { border-color: var(--blue); background: var(--blue-bg); }
.np-ygroup.diff-4 { border-color: var(--red); background: var(--red-bg); }
.np-ycat {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 2px;
}
.np-ywords {
  font-size: 12px;
  color: var(--text-dim);
}

/* Share invite button */
.np-share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 12px 24px;
  background: var(--accent);
  color: #0f0f0f;
  border: none;
  border-radius: 10px;
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  margin-top: 16px;
  transition: opacity 0.15s;
}
.np-share-btn:active {
  opacity: 0.8;
}

/* ============ OVERLAY COUNTDOWN ============ */

.overlay-countdown {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  text-align: center;
}
.overlay-countdown-label {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}
.overlay-countdown-timer {
  font-size: 24px;
  font-weight: 700;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  letter-spacing: 1px;
}

/* Animations */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-8px); }
  40% { transform: translateX(8px); }
  60% { transform: translateX(-6px); }
  80% { transform: translateX(6px); }
}
@keyframes groupReveal {
  0% { transform: scaleY(0); opacity: 0; }
  100% { transform: scaleY(1); opacity: 1; }
}
@keyframes toastIn {
  0% { transform: translateY(-20px); opacity: 0; }
  100% { transform: translateY(0); opacity: 1; }
}
@keyframes toastOut {
  0% { opacity: 1; }
  100% { opacity: 0; transform: translateY(-10px); }
}
@keyframes fadeIn {
  0% { opacity: 0; } 100% { opacity: 1; }
}
@keyframes slideUp {
  0% { transform: translateY(30px); opacity: 0; }
  100% { transform: translateY(0); opacity: 1; }
}
@keyframes shareButtonIn {
  to { opacity:1; transform:scale(1); }
}
/* Responsive */
@media (max-width: 380px) {
  .game-container { padding: 14px 10px 20px; }
  .grid { gap: 6px; }
  .cell { padding: 10px 4px; min-height: 48px; }
  .btn { padding: 10px 20px; font-size: 14px; }
  .btn-share { font-size:14px; padding:10px 16px; }
}
@media (max-width: 340px) {
  .game-container { padding: 12px 8px 20px; }
  .cell { padding: 8px 3px; min-height: 44px; }
}
@media (min-width: 500px) {
  .cell { font-size: 18px; padding: 16px 8px; min-height: 64px; }
}

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

/* Footer */
.footer {
  text-align: center;
  padding: 16px;
  font-size: 11px;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  width: 100%;
  max-width: 500px;
}
.footer a { color: var(--text-dim); text-decoration: none; }