/* ─────────────────────────────────────────────────────────────────────────────
   style.css — CellWorld Daily Challenge
   Dark neon cellular automaton aesthetic.
   Mobile-first (portrait), max 480px — Cordova-compatible.
───────────────────────────────────────────────────────────────────────────── */

@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;600;700;900&family=Inter:wght@300;400;500;600&display=swap');

/* ─── Design tokens ─────────────────────────────────────────────────────────── */
:root {
  /* Colors */
  --bg:          #0b0f1a;
  --bg-card:     rgba(255,255,255,0.04);
  --bg-card-2:   rgba(0,255,102,0.04);
  --cell-alive:  #00ff66;
  --cell-glow:   #00ff6680;
  --accent:      #00ff66;
  --accent-2:    #00ccff;
  --accent-warm: #ffaa00;
  --danger:      #ff4466;
  --text:        #e0ffe8;
  --text-dim:    #7a9e82;
  --text-muted:  #3d5445;
  --border:      rgba(0,255,102,0.15);
  --border-2:    rgba(0,255,102,0.08);

  /* Typography */
  --font-display:  'Orbitron', monospace;
  --font-body:     'Inter', sans-serif;

  /* Spacing */
  --gap-xs:  4px;
  --gap-sm:  8px;
  --gap-md:  16px;
  --gap-lg:  24px;
  --gap-xl:  40px;

  /* Radius */
  --r-sm:  6px;
  --r-md:  12px;
  --r-lg:  20px;
  --r-xl:  32px;

  /* Shadows / glow */
  --glow-sm:  0 0 8px  var(--cell-glow);
  --glow-md:  0 0 20px var(--cell-glow);
  --glow-lg:  0 0 40px var(--cell-glow);
  --glow-btn: 0 0 12px rgba(0,255,102,0.4);

  /* Transitions */
  --t-fast:   0.12s ease;
  --t-mid:    0.25s ease;
  --t-slow:   0.45s ease;
}

/* ─── Reset ─────────────────────────────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0; padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.5;
  overscroll-behavior: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  user-select: none;
  touch-action: manipulation;
}

/* ─── App shell ─────────────────────────────────────────────────────────────── */
#app {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  min-height: 100dvh;
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(0,255,102,0.07) 0%, transparent 70%),
    radial-gradient(ellipse 60% 40% at 50% 100%, rgba(0,204,255,0.05) 0%, transparent 70%),
    var(--bg);
}

/* ─── Screen container ──────────────────────────────────────────────────────── */
.screen {
  position: fixed;
  inset: 0;
  display: none;
  flex-direction: column;
  align-items: center;
  overflow-y: auto;
  overflow-x: hidden;
  padding: env(safe-area-inset-top, 0px) env(safe-area-inset-right, 0px)
           env(safe-area-inset-bottom, 0px) env(safe-area-inset-left, 0px);
  opacity: 0;
  transition: opacity var(--t-mid);
}

.screen.active {
  display: flex;
  opacity: 1;
  animation: screenFadeIn var(--t-mid) ease forwards;
}

.screen-inner {
  width: 100%;
  max-width: 480px;
  padding: var(--gap-md);
  display: flex;
  flex-direction: column;
  gap: var(--gap-md);
  min-height: 100%;
}

@keyframes screenFadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0);    }
}

/* ─── Scanline overlay (aesthetic) ─────────────────────────────────────────── */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    180deg,
    transparent,
    transparent 2px,
    rgba(0,0,0,0.03) 2px,
    rgba(0,0,0,0.03) 4px
  );
  z-index: 9999;
}

/* ─── Typography ─────────────────────────────────────────────────────────────── */
h1, h2, h3 { font-family: var(--font-display); letter-spacing: 0.05em; }
h1 { font-size: clamp(1.4rem, 6vw, 2.2rem); font-weight: 900; }
h2 { font-size: clamp(1.1rem, 4.5vw, 1.6rem); font-weight: 700; }
h3 { font-size: clamp(0.9rem, 3.5vw, 1.2rem); font-weight: 600; }

.neon-text {
  color: var(--cell-alive);
  text-shadow: var(--glow-sm);
}

.accent-text  { color: var(--accent-2); }
.dim-text     { color: var(--text-dim); font-size: 0.85em; }
.muted-text   { color: var(--text-muted); font-size: 0.75em; }

/* ─── Card ───────────────────────────────────────────────────────────────────── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: var(--gap-md);
  backdrop-filter: blur(8px);
}

.card-green {
  background: var(--bg-card-2);
  border-color: rgba(0,255,102,0.25);
}

/* ─── Buttons ────────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--gap-sm);
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  padding: 12px 24px;
  border: 1px solid var(--accent);
  border-radius: var(--r-md);
  background: transparent;
  color: var(--accent);
  cursor: pointer;
  transition: background var(--t-fast), box-shadow var(--t-fast), transform var(--t-fast);
  text-transform: uppercase;
  width: 100%;
  min-height: 48px;
  outline: none;
  -webkit-appearance: none;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--accent);
  color: var(--bg);
  box-shadow: var(--glow-btn);
}

.btn-primary:hover, .btn-primary:focus {
  box-shadow: var(--glow-md);
  background: #22ff77;
}

.btn-ghost {
  border-color: var(--border);
  color: var(--text-dim);
}

.btn-ghost:hover, .btn-ghost:focus {
  border-color: var(--accent);
  color: var(--accent);
}

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

.btn-sm {
  padding: 8px 16px;
  font-size: 0.75rem;
  min-height: 38px;
  width: auto;
}

/* ─── ═══════════════════════ SPLASH SCREEN ═══════════════════════ */
#screen-splash {
  background: var(--bg);
  justify-content: center;
  align-items: center;
}

.splash-logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--gap-md);
  animation: pulseGlow 2s ease-in-out infinite;
}

.splash-icon {
  width: 96px;
  height: 96px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(4, 1fr);
  gap: 4px;
  padding: 8px;
  background: rgba(0,255,102,0.06);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  box-shadow: var(--glow-md);
}

.splash-cell {
  border-radius: 2px;
  background: var(--text-muted);
  transition: background 0.3s;
}

.splash-cell.alive {
  background: var(--cell-alive);
  box-shadow: 0 0 6px var(--cell-glow);
}

.splash-title {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--cell-alive);
  text-shadow: var(--glow-md);
  letter-spacing: 0.1em;
  text-align: center;
}

.splash-sub {
  font-size: 0.7rem;
  letter-spacing: 0.25em;
  color: var(--text-dim);
  text-transform: uppercase;
}

.splash-progress {
  width: 180px;
  height: 2px;
  background: var(--border);
  border-radius: 4px;
  overflow: hidden;
  margin-top: var(--gap-lg);
}

#splash-progress-bar {
  height: 100%;
  width: 0;
  background: var(--accent);
  box-shadow: var(--glow-sm);
  transition: width 0.6s ease;
}

@keyframes pulseGlow {
  0%, 100% { filter: brightness(1);   }
  50%       { filter: brightness(1.2); }
}

/* ─── ═══════════════════════ DAILY SCREEN ═══════════════════════ */
.daily-header {
  text-align: center;
  padding-top: var(--gap-sm);
}

#daily-date {
  font-family: var(--font-display);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--accent-2);
  text-transform: uppercase;
  margin-bottom: var(--gap-xs);
}

#daily-title {
  line-height: 1.1;
}

.daily-preview-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  max-width: 320px;
  align-self: center;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--glow-md), inset 0 0 30px rgba(0,0,0,0.5);
}

#daily-preview-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.daily-preview-badge {
  position: absolute;
  top: var(--gap-sm);
  right: var(--gap-sm);
  background: rgba(0,255,102,0.15);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 2px 8px;
  font-size: 0.65rem;
  font-family: var(--font-display);
  color: var(--accent);
  letter-spacing: 0.1em;
}

.daily-info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap-sm);
}

.daily-info-item {
  background: var(--bg-card);
  border: 1px solid var(--border-2);
  border-radius: var(--r-md);
  padding: var(--gap-sm) var(--gap-md);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.info-label {
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  color: var(--text-muted);
  text-transform: uppercase;
  font-family: var(--font-display);
}

.info-value {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.info-value.neon { color: var(--accent); text-shadow: var(--glow-sm); }

.difficulty-easy   { color: var(--accent-2); }
.difficulty-medium { color: var(--accent-warm); }
.difficulty-hard   { color: var(--danger); }

.daily-lb-section h3 {
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--text-dim);
  margin-bottom: var(--gap-sm);
  text-transform: uppercase;
}

#daily-completed-badge {
  display: none;
  text-align: center;
  font-size: 0.8rem;
  color: var(--accent);
  background: rgba(0,255,102,0.08);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 6px;
  font-family: var(--font-display);
}

/* ─── ═══════════════════════ GAME SCREEN ════════════════════════ */
#screen-game {
  padding: 0;
}

#screen-game .screen-inner {
  padding: var(--gap-sm);
  gap: var(--gap-sm);
  justify-content: space-between;
  min-height: 100dvh;
}

/* HUD */
.game-hud {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--gap-sm);
  padding: var(--gap-sm);
}

.hud-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1px;
}

.hud-label {
  font-size: 0.55rem;
  letter-spacing: 0.15em;
  color: var(--text-muted);
  text-transform: uppercase;
  font-family: var(--font-display);
}

.hud-value {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1;
}

.hud-score-item .hud-value {
  font-size: 1.3rem;
  color: var(--accent);
  text-shadow: var(--glow-sm);
}

/* Target bar */
#hud-alive-bar {
  --bar-pct: 0%;
  position: relative;
  width: 100%;
  height: 6px;
  background: rgba(0,255,102,0.1);
  border-radius: 99px;
  overflow: hidden;
  flex-shrink: 0;
}

#hud-alive-bar::before {
  content: '';
  position: absolute;
  left: 0; top: 0;
  width: var(--bar-pct);
  height: 100%;
  background: var(--accent);
  box-shadow: var(--glow-sm);
  border-radius: 99px;
  transition: width 0.3s ease;
}

#hud-alive-bar.at-target::before {
  background: var(--accent-warm);
  box-shadow: 0 0 8px rgba(255,170,0,0.6);
  animation: barPulse 0.8s infinite;
}

@keyframes barPulse {
  0%, 100% { opacity: 1;   }
  50%       { opacity: 0.6; }
}

/* Canvas wrapper */
.canvas-wrap {
  position: relative;
  width: 100%;
  flex: 1 1 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-radius: var(--r-lg);
  border: 1px solid var(--border);
  box-shadow: var(--glow-md), inset 0 0 40px rgba(0,0,0,0.6);
}

#game-canvas {
  display: block;
  width:  100%;
  height: 100%;
  cursor: crosshair;
  touch-action: none;
  border-radius: var(--r-lg);
}

/* Controls */
.game-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap-sm);
  padding-bottom: env(safe-area-inset-bottom, 8px);
}

.game-controls .btn-primary { grid-column: 1 / -1; }

/* ─── ═══════════════════════ RESULT SCREEN ══════════════════════ */
.result-header {
  text-align: center;
  padding-top: var(--gap-md);
}

.result-score-display {
  text-align: center;
  padding: var(--gap-lg) 0;
}

.result-score-label {
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--text-muted);
  text-transform: uppercase;
  font-family: var(--font-display);
}

#result-score {
  font-family: var(--font-display);
  font-size: clamp(3rem, 15vw, 5rem);
  font-weight: 900;
  color: var(--accent);
  text-shadow: var(--glow-lg);
  line-height: 1;
  animation: scoreAppear 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

@keyframes scoreAppear {
  from { transform: scale(0.4); opacity: 0; }
  to   { transform: scale(1);   opacity: 1; }
}

.result-stats {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--gap-sm);
}

.result-stat {
  background: var(--bg-card);
  border: 1px solid var(--border-2);
  border-radius: var(--r-md);
  padding: var(--gap-sm);
  text-align: center;
}

.result-stat-label {
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  text-transform: uppercase;
  font-family: var(--font-display);
}

.result-stat-value {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--text);
}

#result-submit-status {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-dim);
  min-height: 1.5em;
}

/* Leaderboard (shared) */
.lb-empty {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  padding: var(--gap-md);
}

.lb-row {
  display: flex;
  align-items: center;
  gap: var(--gap-sm);
  padding: 8px var(--gap-sm);
  border-radius: var(--r-sm);
  transition: background var(--t-fast);
}

.lb-row:hover { background: rgba(0,255,102,0.04); }

.lb-row.lb-top {
  background: rgba(0,255,102,0.05);
  border: 1px solid var(--border-2);
  border-radius: var(--r-sm);
  margin-bottom: 2px;
}

.lb-rank  { width: 2em; text-align: center; font-size: 1rem; }
.lb-name  { flex: 1; font-size: 0.88rem; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.lb-score { font-family: var(--font-display); font-weight: 700; color: var(--accent); font-size: 0.9rem; }

/* ─── ════════════════════ TUTORIAL OVERLAY ════════════════════ */
#tutorial-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  pointer-events: all;
  animation: screenFadeIn var(--t-mid) ease;
}

#tutorial-overlay.fade-out {
  animation: screenFadeOut var(--t-mid) ease forwards;
}

@keyframes screenFadeOut {
  to { opacity: 0; transform: translateY(-8px); }
}

#tutorial-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(11, 15, 26, 0.65);
}

#tutorial-spotlight {
  position: fixed;
  display: none;
  border: 2px solid var(--accent);
  box-shadow: var(--glow-md), inset 0 0 0 2000px rgba(11,15,26,0);
  z-index: 1001;
  pointer-events: none;
  transition: all var(--t-mid);
}

#tutorial-card {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: calc(100% - var(--gap-md) * 2);
  max-width: 440px;
  background: rgba(12, 20, 14, 0.95);
  border: 1px solid rgba(0,255,102,0.3);
  border-radius: var(--r-lg);
  padding: var(--gap-lg);
  box-shadow: 0 0 60px rgba(0,255,102,0.15), 0 24px 60px rgba(0,0,0,0.6);
  z-index: 1002;
}

#tutorial-step-indicator {
  display: flex;
  gap: 6px;
  justify-content: center;
  margin-bottom: var(--gap-md);
}

.tut-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: all var(--t-mid);
}

.tut-dot.active {
  width: 20px;
  border-radius: 3px;
  background: var(--accent);
  box-shadow: var(--glow-sm);
}

#tutorial-title {
  font-size: 1.1rem;
  margin-bottom: var(--gap-sm);
  color: var(--accent);
  text-shadow: var(--glow-sm);
}

#tutorial-body {
  font-size: 0.9rem;
  color: var(--text-dim);
  margin-bottom: var(--gap-lg);
  line-height: 1.6;
}

#tutorial-actions {
  display: flex;
  gap: var(--gap-sm);
}

#tutorial-skip {
  flex: 0 0 auto;
  font-family: var(--font-body);
  font-size: 0.8rem;
  color: var(--text-muted);
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

#tutorial-next {
  flex: 1;
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--bg);
  background: var(--accent);
  border: none;
  border-radius: var(--r-md);
  padding: 12px;
  cursor: pointer;
  box-shadow: var(--glow-btn);
  transition: box-shadow var(--t-fast), transform var(--t-fast);
}

#tutorial-next:active { transform: scale(0.97); }

/* ─── Animations ─────────────────────────────────────────────────────────────── */
@keyframes flicker {
  0%   { opacity: 1; }
  92%  { opacity: 1; }
  93%  { opacity: 0.4; }
  94%  { opacity: 1; }
  96%  { opacity: 0.7; }
  100% { opacity: 1; }
}

.flicker { animation: flicker 8s infinite; }

/* ─── Scrollbar (styled) ─────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 3px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

/* ─── Responsive tweaks ──────────────────────────────────────────────────────── */
@media (min-height: 700px) {
  .splash-icon  { width: 120px; height: 120px; }
  .splash-title { font-size: 1.8rem; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0ms !important; transition-duration: 0ms !important; }
}

@media (hover: hover) {
  .btn:hover { filter: brightness(1.1); }
}

/* ─── Cell limit banner ──────────────────────────────────────────────────────── */
#cell-limit-banner {
  text-align: center;
  font-family: var(--font-display);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  color: var(--text-muted);
  padding: 3px 0;
  transition: color var(--t-mid), text-shadow var(--t-mid);
  flex-shrink: 0;
}

#cell-limit-banner.at-limit {
  color: var(--danger);
  text-shadow: 0 0 8px rgba(255,68,102,0.6);
  animation: barPulse 0.8s infinite;
}

/* ─── Modal overlays ───────────────────────────────────────────────────────────── */
#ad-modal-overlay,
#name-modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(11,15,26,0.88);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--gap-md);
  animation: screenFadeIn var(--t-mid) ease;
}

#ad-modal,
#name-modal {
  background: rgba(12,20,14,0.97);
  border: 1px solid rgba(0,255,102,0.25);
  border-radius: var(--r-xl);
  padding: var(--gap-lg) var(--gap-md);
  max-width: 360px;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--gap-md);
  box-shadow: 0 0 60px rgba(0,255,102,0.12), 0 24px 60px rgba(0,0,0,0.5);
  text-align: center;
}

.name-input-field {
  width: 100%;
  padding: 14px 16px;
  background: rgba(0,0,0,0.3);
  border: 1px solid rgba(0,255,102,0.3);
  border-radius: var(--r-md);
  color: var(--text);
  font-family: inherit;
  font-size: 1.2rem;
  font-weight: 500;
  text-align: center;
  outline: none;
  transition: all 0.2s ease;
}

.name-input-field:focus {
  border-color: var(--primary);
  box-shadow: 0 0 16px rgba(0,255,102,0.2);
  background: rgba(0,255,102,0.05);
}

.ad-modal-icon {
  font-size: 2.5rem;
  line-height: 1;
}

.ad-modal-title {
  font-size: 1.1rem;
  color: var(--danger);
  text-shadow: 0 0 12px rgba(255,68,102,0.4);
  margin: 0;
}

.ad-modal-body {
  font-size: 0.88rem;
  color: var(--text-dim);
  line-height: 1.6;
}

.ad-modal-body strong { color: var(--text); }

/* Ad placeholder box */
#ad-placeholder {
  border: 1px dashed rgba(0,255,102,0.2);
  border-radius: var(--r-md);
  padding: var(--gap-md);
  background: rgba(255,255,255,0.02);
}

.ad-placeholder-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: var(--gap-sm) 0;
}

.ad-placeholder-inner p {
  font-size: 0.88rem;
  color: var(--text-dim);
  margin: 0;
}

.ad-sub {
  font-size: 0.7rem !important;
  color: var(--text-muted) !important;
  font-family: var(--font-display);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.ad-badge {
  display: inline-block;
  background: rgba(255,170,0,0.15);
  border: 1px solid rgba(255,170,0,0.3);
  color: var(--accent-warm);
  font-family: var(--font-display);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  padding: 2px 8px;
  border-radius: var(--r-sm);
}

#ad-watch-btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

/* ─── ════════════════════════ HOME SCREEN ════════════════════════ */
#screen-home {
  justify-content: center;
}

.home-inner {
  width: 100%;
  max-width: 440px;
  padding: var(--gap-lg) var(--gap-md);
  display: flex;
  flex-direction: column;
  gap: var(--gap-lg);
  align-items: center;
  justify-content: center;
  min-height: 100dvh;
}

.home-logo {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
}

.home-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 8vw, 2.8rem);
  font-weight: 900;
  color: var(--accent);
  text-shadow: var(--glow-lg);
  letter-spacing: 0.08em;
}

.home-sub {
  font-size: 0.75rem;
  letter-spacing: 0.25em;
  color: var(--text-dim);
  text-transform: uppercase;
}

.home-modes {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--gap-md);
}

.mode-card {
  display: flex;
  align-items: center;
  gap: var(--gap-md);
  padding: var(--gap-md) var(--gap-lg);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  cursor: pointer;
  transition: background var(--t-mid), border-color var(--t-mid), box-shadow var(--t-mid), transform var(--t-fast);
  text-align: left;
  width: 100%;
  outline: none;
  -webkit-appearance: none;
  position: relative;
  overflow: hidden;
}

.mode-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, currentColor 0%, transparent 60%);
  opacity: 0.03;
  pointer-events: none;
  transition: opacity var(--t-mid);
}

.mode-card:active { transform: scale(0.98); }
.mode-card:hover, .mode-card:focus {
  box-shadow: var(--glow-sm);
  border-color: var(--accent);
  background: var(--bg-card-2);
}

.mode-card:hover::before { opacity: 0.07; }

.mode-card--daily  { --mode-color: var(--accent); border-left: 3px solid var(--accent); }
.mode-card--practice { --mode-color: var(--accent-2); border-left: 3px solid var(--accent-2); }
.mode-card--pvp    { --mode-color: #8b5cf6; border-left: 3px solid #8b5cf6; }

.mode-emoji {
  font-size: 2rem;
  line-height: 1;
  flex-shrink: 0;
}

.mode-text { display: flex; flex-direction: column; gap: 2px; }

.mode-title {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--mode-color, var(--text));
}

.mode-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* ─── ════════════════════════ PvP SCREEN ════════════════════════ */
#screen-pvp {
  padding: 0;
}

#screen-pvp .screen-inner {
  padding: var(--gap-sm);
  gap: var(--gap-sm);
  justify-content: space-between;
  min-height: 100dvh;
}

/* PvP HUD */
.pvp-hud {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--gap-sm);
  padding: var(--gap-sm);
}

.pvp-cells {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.pvp-cells span {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
}

.pvp-center {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

#pvp-round {
  font-family: var(--font-display);
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  text-transform: uppercase;
}

#pvp-turn {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-shadow: var(--glow-sm);
  transition: color var(--t-mid);
}

#pvp-role {
  font-size: 0.62rem;
  letter-spacing: 0.15em;
  color: var(--text-muted);
  text-transform: uppercase;
  font-family: var(--font-display);
  text-align: center;
}

/* PvP canvas */
.pvp-canvas-wrap {
  position: relative;
  width: 100%;
  flex: 1 1 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-radius: var(--r-lg);
  border: 1px solid rgba(139, 92, 246, 0.2);
  box-shadow: 0 0 30px rgba(139,92,246,0.1), inset 0 0 40px rgba(0,0,0,0.6);
}

#pvp-canvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: crosshair;
  touch-action: none;
  border-radius: var(--r-lg);
}

/* PvP status */
#pvp-status {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-dim);
  min-height: 1.4em;
  font-family: var(--font-display);
  letter-spacing: 0.05em;
  flex-shrink: 0;
}

/* PvP controls */
.pvp-controls {
  display: flex;
  gap: var(--gap-sm);
  padding-bottom: env(safe-area-inset-bottom, 8px);
}

#pvp-confirm-btn {
  flex: 2;
  background: #8b5cf6;
  border-color: #8b5cf6;
  color: #fff;
  box-shadow: 0 0 12px rgba(139,92,246,0.4);
}

#pvp-confirm-btn:hover:not(:disabled) {
  background: #7c3aed;
  box-shadow: 0 0 20px rgba(139,92,246,0.6);
}

#pvp-confirm-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

#pvp-pass-btn {
  flex: 1;
}

/* PvP overlay (waiting / searching / simulation) */
#pvp-overlay {
  position: absolute;
  inset: 0;
  z-index: 100;
  background: rgba(11,15,26,0.86);
  backdrop-filter: blur(6px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--gap-md);
  border-radius: var(--r-lg);
  animation: screenFadeIn var(--t-mid) ease;
}

#pvp-overlay-msg {
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 0.08em;
  color: var(--text);
  text-align: center;
}

.pvp-spinner {
  width: 36px;
  height: 36px;
  border: 3px solid rgba(139,92,246,0.2);
  border-top-color: #8b5cf6;
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* PvP result overlay */
#pvp-result-overlay {
  display: none;
  position: absolute;
  inset: 0;
  z-index: 200;
  background: rgba(11,15,26,0.93);
  backdrop-filter: blur(10px);
  border-radius: var(--r-lg);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--gap-lg);
  padding: var(--gap-lg);
  animation: screenFadeIn var(--t-mid) ease;
}

#pvp-result-heading {
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 5vw, 1.8rem);
  font-weight: 900;
  text-align: center;
  color: #8b5cf6;
  text-shadow: 0 0 20px rgba(139,92,246,0.5);
}

#pvp-result-stats {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
}

.pvp-result-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--gap-sm) var(--gap-md);
  background: var(--bg-card);
  border-radius: var(--r-md);
  border: 1px solid var(--border-2);
}

.pvp-result-label {
  font-size: 0.82rem;
  font-weight: 600;
}

.pvp-result-count {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text);
}

#pvp-result-back {
  background: #8b5cf6;
  border-color: #8b5cf6;
  color: #fff;
  box-shadow: 0 0 12px rgba(139,92,246,0.4);
  width: 100%;
  max-width: 320px;
}