/**
 * BabySnek Arcade — Snake 2 Game Styles
 * Built on top of webapp design system (variables, base, components, themes)
 */

/* ── Global keyframes ──────────────────────────────────────── */

@keyframes fade-up {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes scale-in {
  from { opacity: 0; transform: scale(0.92); }
  to   { opacity: 1; transform: scale(1); }
}

@keyframes slide-in-right {
  from { opacity: 0; transform: translateX(24px); }
  to   { opacity: 1; transform: translateX(0); }
}

@keyframes glow-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(4, 207, 255, 0); }
  50%       { box-shadow: 0 0 0 6px rgba(4, 207, 255, 0.15); }
}

/* ── Page shell ────────────────────────────────────────────── */

body {
  font-family: var(--font-body);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding: 4rem 1rem 2rem;
  overflow-x: hidden;
}

/* Page-exit fade (used by quit transition) */
body.page-exit { opacity: 0; transition: opacity 0.35s ease; }

/* ── Main card container ───────────────────────────────────── */

#main-container {
  width: 100%;
  max-width: 820px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  box-shadow: 0 8px 40px var(--shadow-color, rgba(0,0,0,0.25));
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: var(--spacing-xl);
  opacity: 0;
  transition: opacity 0.5s ease, background 0.4s ease, border-color 0.4s ease,
              box-shadow 0.3s ease;
  position: relative;
}

#main-container.loaded {
  opacity: 1;
  animation: fade-up 0.5s cubic-bezier(0.4, 0, 0.2, 1) both;
}
#main-container.achievements-wide { max-width: 1100px; }

/* ── Top bar: back + theme ─────────────────────────────────── */

.arcade-topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1rem;
  z-index: var(--z-sticky, 200);
  background: var(--bg-nav, rgba(11,17,23,0.7));
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.arcade-back-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-body);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-muted);
  text-decoration: none;
  padding: 6px 12px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  background: var(--glass-bg);
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}
.arcade-back-btn:hover {
  color: var(--accent-primary);
  border-color: var(--accent-primary);
  background: var(--glass-bg-hover);
}

.arcade-topbar-title {
  font-family: var(--font-display);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  color: var(--text-heading);
  letter-spacing: 0.04em;
}

.arcade-theme-toggle {
  background: var(--glass-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  padding: 6px 12px;
  font-size: 1rem;
  cursor: pointer;
  color: var(--text-muted);
  transition: border-color 0.2s, color 0.2s, background 0.2s;
  line-height: 1;
  display: flex;
  align-items: center;
  gap: 6px;
}
.arcade-theme-toggle:hover {
  color: var(--accent-primary);
  border-color: var(--accent-primary);
  background: var(--glass-bg-hover);
}

/* ── Headings ──────────────────────────────────────────────── */

.game-logo {
  width: 120px;
  margin-bottom: 0.5rem;
}

.main-heading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  margin-bottom: 1rem;
}

.heading-style-1 {
  font-family: var(--font-display);
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--accent-primary);
  letter-spacing: -0.01em;
  line-height: 1.1;
}

/* ── Game title animation ───────────────────────────────────── */

/* Keyframes */
@keyframes logo-drop {
  0%   { opacity: 0; transform: translateY(-32px) scale(0.8); }
  65%  { opacity: 1; transform: translateY(6px) scale(1.05); }
  82%  { transform: translateY(-3px) scale(0.98); }
  100% { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes letter-drop {
  0%   { opacity: 0; transform: translateY(-24px) rotate(-8deg); }
  60%  { opacity: 1; transform: translateY(4px) rotate(2deg); }
  80%  { transform: translateY(-2px) rotate(-1deg); }
  100% { opacity: 1; transform: translateY(0) rotate(0deg); }
}

@keyframes num-pop {
  0%   { opacity: 0; transform: scale(0) rotate(-15deg); }
  60%  { opacity: 1; transform: scale(1.25) rotate(6deg); }
  80%  { transform: scale(0.92) rotate(-2deg); }
  100% { opacity: 1; transform: scale(1) rotate(0deg); }
}

@keyframes title-shimmer {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

@keyframes title-glow {
  0%, 100% { text-shadow: 0 0 18px rgba(255, 100, 0, 0.4),  0 0 36px rgba(255, 100, 0, 0.15); }
  25%       { text-shadow: 0 0 18px rgba(100, 220, 255, 0.5), 0 0 36px rgba(100, 220, 255, 0.2); }
  50%       { text-shadow: 0 0 18px rgba(80, 200, 120, 0.45), 0 0 36px rgba(80, 200, 120, 0.15); }
  75%       { text-shadow: 0 0 18px rgba(150, 230, 200, 0.45), 0 0 36px rgba(150, 230, 200, 0.15); }
}

/* Logo entrance */
.main-heading .game-logo {
  animation: logo-drop 0.7s cubic-bezier(0.34, 1.2, 0.64, 1) 0.1s both;
}

/* Title wrapper */
.game-title {
  display: inline-flex;
  align-items: baseline;
  gap: 0.2em;
  font-family: 'Press Start 2P', monospace;
  font-size: 2rem;
  font-weight: var(--font-weight-bold);
  line-height: 1.3;
  color: var(--accent-primary, #04CFFF);
  text-shadow: 0 0 12px rgba(4,207,255,0.6), 0 0 32px rgba(4,207,255,0.3);
  letter-spacing: 0.08em;
}

/* Word: each letter animates in */
.game-title__word {
  display: inline-flex;
}

.game-title__letter {
  display: inline-block;
  opacity: 0;
  animation: letter-drop 0.55s cubic-bezier(0.34, 1.25, 0.64, 1) both;
  animation-delay: calc(0.35s + var(--i) * 0.07s);
}

/* The "2" */
.game-title__num {
  display: inline-block;
  opacity: 0;
  animation: num-pop 0.6s cubic-bezier(0.34, 1.3, 0.64, 1) calc(0.35s + 5 * 0.07s + 0.08s) both;
  /* Slightly offset hue so it pops */
  filter: hue-rotate(30deg) brightness(1.1);
}

/* Hover: letters wiggle */
.game-title:hover .game-title__letter {
  animation: letter-drop 0.4s cubic-bezier(0.34, 1.4, 0.64, 1) both;
  animation-delay: calc(var(--i) * 0.04s);
}
.game-title:hover .game-title__num {
  animation: num-pop 0.45s cubic-bezier(0.34, 1.4, 0.64, 1) calc(5 * 0.04s + 0.04s) both;
}

/* ── Heading styles ─────────────────────────────────────────── */

.heading-style-2 {
  font-family: var(--font-display);
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-heading);
}

.heading-style-3 {
  font-family: var(--font-display);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--accent-secondary);
  margin: 1rem 0 0.5rem;
}

/* ── Start screen ──────────────────────────────────────────── */

#start-screen {
  text-align: center;
}

.pong-elements-row {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin: 1rem 0;
}

/* Stagger badge entrance when start screen is active */
#start-screen.active .pong-element-badge {
  animation: fade-up 0.4s cubic-bezier(0.4, 0, 0.2, 1) both;
}
#start-screen.active .pong-element-badge:nth-child(1) { animation-delay: 0.05s; }
#start-screen.active .pong-element-badge:nth-child(2) { animation-delay: 0.12s; }
#start-screen.active .pong-element-badge:nth-child(3) { animation-delay: 0.19s; }
#start-screen.active .pong-element-badge:nth-child(4) { animation-delay: 0.26s; }

.pong-element-badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 10px 14px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  min-width: 72px;
  transition: border-color 0.25s, transform 0.25s, box-shadow 0.25s;
  cursor: default;
}
.pong-element-badge:hover {
  border-color: var(--accent-primary);
  transform: translateY(-4px) scale(1.04);
  box-shadow: 0 8px 20px rgba(4, 207, 255, 0.15);
}
.pong-element-badge img {
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.pong-element-badge:hover img {
  transform: scale(1.15) rotate(-5deg);
}
.pong-element-badge img { width: 40px; height: 40px; object-fit: contain; }
.pong-element-badge span {
  font-family: var(--font-display);
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.pong-tagline {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  margin: 0.5rem auto 1.5rem;
  max-width: 480px;
  line-height: var(--line-height-relaxed);
}

.pong-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 0.5rem;
}

/* ── Buttons ───────────────────────────────────────────────── */

/* Map old arcade button classes to webapp button system */
.btn-arcade {
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  cursor: pointer;
  transition: all var(--transition-base);
  border: 1px solid transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  text-decoration: none;
  white-space: nowrap;
}

.btn-arcade--primary,
.pong-start-btn {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  box-shadow: 0 8px 20px var(--btn-primary-shadow, rgba(0,0,0,0.2));
  position: relative;
  overflow: hidden;
}
/* Shimmer sweep */
.btn-arcade--primary::after,
.pong-start-btn::after {
  content: '';
  position: absolute;
  inset: -60% -30%;
  background: linear-gradient(120deg, transparent, rgba(255,255,255,0.22), transparent);
  opacity: 0;
  transform: translateX(-40%);
  transition: opacity 0.4s, transform 0.6s ease;
  pointer-events: none;
}
.btn-arcade--primary:hover::after,
.pong-start-btn:hover::after {
  opacity: 1;
  transform: translateX(40%);
}
.btn-arcade--primary:hover,
.pong-start-btn:hover {
  background: var(--btn-primary-hover, var(--btn-primary-bg));
  transform: translateY(-2px);
  box-shadow: 0 14px 32px var(--btn-primary-shadow, rgba(0,0,0,0.3));
}
.btn-arcade--primary:active,
.pong-start-btn:active {
  transform: translateY(0);
  box-shadow: 0 4px 12px var(--btn-primary-shadow, rgba(0,0,0,0.2));
}

.btn-arcade--secondary {
  background: var(--btn-secondary-bg);
  color: var(--btn-secondary-text);
  border: 1px solid var(--btn-secondary-border);
  transition: background 0.2s, border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}
.btn-arcade--secondary:hover {
  background: var(--btn-secondary-hover);
  border-color: var(--accent-primary);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(4, 207, 255, 0.1);
}
.btn-arcade--secondary:active { transform: translateY(0); }

/* ── Tab nav ───────────────────────────────────────────────── */

.tabs {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  gap: 0.2rem;
  border-top: 1px solid var(--border-color);
  margin-top: 1.5rem;
  padding-top: 0.5rem;
  /* Quit btn pushed to right */
}

.tab-link {
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  padding: 0.45rem 0.9rem;
  font-family: var(--font-body);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-muted);
  cursor: pointer;
  transition: color 0.2s, background 0.2s, border-color 0.2s;
  white-space: nowrap;
  flex-shrink: 0;
}
.tab-link:hover {
  color: var(--accent-primary);
  background: var(--glass-bg-hover);
}
.tab-link.active {
  color: var(--accent-primary);
  border-color: var(--border-color-strong);
  background: var(--glass-bg);
}
#quit-btn {
  margin-left: auto;
  color: var(--text-muted);
  flex-shrink: 0;
}
#quit-btn:hover { color: var(--error, #F29CA3); }

/* ── Tab content ───────────────────────────────────────────── */

.tab-content { display: none; width: 100%; }
.tab-content.active {
  display: block;
  animation: fade-up 0.3s cubic-bezier(0.4, 0, 0.2, 1) both;
}

/* Game container transition */
#game-container { transition: opacity 0.3s ease; }
#game-container.visible { opacity: 1; }

/* ── Game canvas area ──────────────────────────────────────── */

#game-canvas {
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  display: block;
  max-width: 100%;
  transition: border-color 0.3s, box-shadow 0.3s;
}
/* Subtle glow while game is running (toggled via JS class) */
#game-canvas.running {
  border-color: rgba(4, 207, 255, 0.3);
  box-shadow: 0 0 24px rgba(4, 207, 255, 0.1), 0 0 0 1px rgba(4,207,255,0.08);
}

#game-info-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: 640px;
  padding: 0.4rem 0.75rem;
  background: var(--glass-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  font-family: var(--font-body);
}

#pause-btn {
  background: var(--glass-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 2px 8px;
  font-size: 0.8rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
}
#pause-btn:hover { color: var(--accent-primary); border-color: var(--accent-primary); }

.coming-note {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  margin-top: 0.5rem;
  font-family: var(--font-body);
}

/* ── Overlays (loading / countdown / pause) ────────────────── */

.countdown-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--glass-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-radius: var(--radius-lg);
  z-index: 10;
}

.countdown-content {
  text-align: center;
  color: var(--text-heading);
  font-family: var(--font-display);
  font-size: var(--font-size-2xl);
}

.spinner {
  width: 44px;
  height: 44px;
  border: 4px solid var(--border-color);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
  margin: 0 auto 10px;
}
@keyframes spin { to { transform: rotate(360deg); } }

#pause-screen {
  display: none;
  position: absolute;
  inset: 0;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 1rem;
  background: var(--glass-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-radius: var(--radius-lg);
  z-index: 11;
}
#pause-screen.visible { display: flex; }

/* ── Element popup ─────────────────────────────────────────── */

.element-popup {
  position: absolute;
  top: 12%;
  left: 50%;
  transform: translateX(-50%) scale(0.9);
  display: none;
  z-index: 50;
  padding: 10px 16px;
  border-radius: var(--radius-lg);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 8px 24px var(--shadow-color, rgba(0,0,0,0.25));
  opacity: 0;
  transition: opacity 0.2s, transform 0.2s;
}
.element-popup.show { display: block; opacity: 1; transform: translateX(-50%) scale(1); }
.element-popup img { height: 44px; display: block; }

.power-icon {
  height: 17px;
  width: 17px;
  vertical-align: middle;
  margin-left: 5px;
  filter: drop-shadow(0 0 2px rgba(0,0,0,0.3));
}

/* ── Modals ────────────────────────────────────────────────── */

.modal {
  display: none;
  position: fixed;
  z-index: var(--z-modal, 1000);
  inset: 0;
  overflow: auto;
  background: var(--overlay-bg, rgba(0,0,0,0.5));
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
.modal[aria-hidden="false"],
.modal.open { display: block; }

.modal-content {
  margin: 8% auto;
  padding: var(--spacing-lg);
  width: 90%;
  max-width: 660px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  box-shadow: 0 12px 40px var(--shadow-color, rgba(0,0,0,0.3));
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  color: var(--text-body);
  position: relative;
  animation: scale-in 0.25s cubic-bezier(0.34, 1.2, 0.64, 1) both;
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: var(--glass-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  cursor: pointer;
  color: var(--text-muted);
  line-height: 1;
  transition: color 0.2s, border-color 0.2s;
}
.modal-close:hover { color: var(--accent-primary); border-color: var(--accent-primary); }

.modal-content p { color: var(--text-body); line-height: var(--line-height-relaxed); }
.modal-content li { color: var(--text-body); margin: 0.25rem 0; }
.modal-content b { color: var(--text-heading); }

.help-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  margin-top: 1.25rem;
}

/* Help modal grid */
.help-grid { display: grid; grid-template-columns: 1fr; gap: 0.6rem; margin: 0.75rem 0; }
.help-item {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  padding: 10px 12px;
  border-radius: var(--radius-md);
  color: var(--text-body);
  font-size: var(--font-size-sm);
}
.help-item img { width: 34px; height: 34px; flex-shrink: 0; }
.help-item b { color: var(--text-heading); }

.help-list {
  list-style: none;
  padding: 0;
  margin: 0.5rem 0;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.help-list li { font-size: var(--font-size-sm); color: var(--text-secondary); display: flex; align-items: center; gap: 8px; }

/* Colored bullets */
.bullet { display: inline-block; width: 12px; height: 12px; border-radius: 50%; flex-shrink: 0; }
.bullet-food     { background: #5aef82; box-shadow: 0 0 5px #5aef82; }
.bullet-obstacle { background: #888; box-shadow: 0 0 4px #666; }
.bullet-portal   { background: var(--snek-pink, #FC8ECD); box-shadow: 0 0 5px var(--snek-pink, #FC8ECD); }

/* Keyboard key */
.kbd {
  display: inline-block;
  background: var(--card-bg);
  border: 1px solid var(--border-color-strong);
  border-radius: var(--radius-sm);
  padding: 1px 6px;
  font-family: var(--font-body);
  font-size: 0.8em;
  color: var(--text-heading);
  font-weight: var(--font-weight-bold);
}

.lead {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: 0.5rem;
}

/* ── Game Over modal ───────────────────────────────────────── */

#snake-gameover .modal-content ul {
  list-style: none;
  padding: 0;
  margin: 0.75rem 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}
#snake-gameover .modal-content ul li {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 0.5rem 0.75rem;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}
#snake-gameover .modal-content ul li b { color: var(--accent-primary); }

/* ── Highscores ────────────────────────────────────────────── */

#highscore-screen { text-align: center; }

#snake-highscore-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
  font-family: var(--font-body);
  font-size: var(--font-size-sm);
}
#snake-highscore-table th,
#snake-highscore-table td {
  padding: 0.6rem 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
}
#snake-highscore-table th {
  color: var(--text-muted);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: var(--card-bg);
}
#snake-highscore-table tbody tr:hover { background: var(--glass-bg-hover); }
#snake-highscore-table td:nth-child(1) { color: var(--accent-primary); font-weight: var(--font-weight-bold); }

/* ── Options ───────────────────────────────────────────────── */

#options-screen { max-width: 480px; margin: 0 auto; }

.options-container {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin: 1rem 0;
}

.option {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 0.85rem;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  color: var(--text-body);
}

.option label:first-child { color: var(--text-secondary); }

input[type="range"] {
  accent-color: var(--accent-primary);
  width: 110px;
}

/* Toggle switch */
.switch { position: relative; display: inline-block; width: 40px; height: 22px; }
.switch input { opacity: 0; width: 0; height: 0; }
.slider {
  position: absolute;
  inset: 0;
  background: var(--border-color-strong);
  border-radius: var(--radius-full);
  transition: background 0.3s;
  cursor: pointer;
}
.slider::before {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  left: 3px;
  top: 3px;
  background: #fff;
  border-radius: 50%;
  transition: transform 0.3s;
}
.switch input:checked + .slider { background: var(--accent-primary); }
.switch input:checked + .slider::before { transform: translateX(18px); }

/* Toast */
.toast {
  position: fixed;
  bottom: 5rem;
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  background: var(--glass-bg);
  border: 1px solid var(--border-color-strong);
  border-radius: var(--radius-full);
  padding: 0.55rem 1.4rem;
  font-family: var(--font-body);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-heading);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
  z-index: var(--z-toast, 1100);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
  display: block;   /* always in DOM, visibility via opacity */
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ═══════════════════════════════════════════════════════════
   ACHIEVEMENTS PAGE
   ═══════════════════════════════════════════════════════════ */

/* Outer wrapper — block, not grid (renderAchievements owns layout) */
.achievements-container {
  display: block;
  width: 100%;
  margin-top: 0.5rem;
}

/* Header row: title + progress bar */
.achievement-header {
  margin-bottom: 0.75rem;
}
.achievement-header .heading-style-3 {
  margin-bottom: 0.4rem;
}

/* Progress bar */
.achievement-progress {
  height: 6px;
  background: var(--border-color);
  border-radius: var(--radius-full);
  overflow: hidden;
}
.achievement-progress.mini {
  height: 4px;
  min-width: 60px;
}
.achievement-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  border-radius: var(--radius-full);
  transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  min-width: 4px;
}

/* Rarity legend */
.achievement-legend {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}

/* Badges — rarity + status */
.achievement-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  font-family: var(--font-body);
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  white-space: nowrap;
}
.achievement-badge img { width: 12px; height: 12px; }

.rarity-common {
  background: rgba(127, 184, 224, 0.12);
  border-color: rgba(127, 184, 224, 0.35);
  color: var(--dark-blue-1, #7FB8E0);
}
.rarity-rare {
  background: rgba(252, 142, 205, 0.12);
  border-color: rgba(252, 142, 205, 0.35);
  color: var(--snek-pink, #FC8ECD);
}
.rarity-epic {
  background: rgba(167, 100, 255, 0.12);
  border-color: rgba(167, 100, 255, 0.4);
  color: #c07fff;
}

/* Summary table */
.achievement-summary-wrap {
  margin: 0.75rem 0 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.achievement-summary {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-body);
  font-size: var(--font-size-sm);
}
.achievement-summary th,
.achievement-summary td {
  padding: 0.55rem 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}
.achievement-summary th {
  background: var(--card-bg);
  color: var(--text-muted);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.achievement-summary tr:last-child td { border-bottom: none; }
.achievement-summary td:first-child { color: var(--text-heading); font-weight: var(--font-weight-medium); }
.achievement-summary td:nth-child(2) { color: var(--accent-primary); }
.achievement-summary tbody tr {
  transition: background 0.15s;
}
.achievement-summary tbody tr:hover { background: var(--glass-bg-hover); }

/* Category sections */
.achievement-section {
  margin-bottom: 1.5rem;
}
.heading-style-4 {
  font-family: var(--font-body);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.6rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border-color);
}

/* Achievement card grid */
.achievement-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem;
}
.achievement-grid.hidden { display: none; }

/* Individual achievement card */
.achievement-card {
  display: grid;
  grid-template-columns: 44px 1fr auto;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  cursor: default;
  position: relative;
  overflow: hidden;
}

/* Shimmer sweep on hover */
.achievement-card::after {
  content: '';
  position: absolute;
  inset: -60% -30%;
  background: linear-gradient(120deg, transparent, rgba(255,255,255,0.06), transparent);
  opacity: 0;
  transform: translateX(-40%);
  transition: opacity 0.4s ease, transform 0.7s ease;
  pointer-events: none;
}
.achievement-card:hover::after {
  opacity: 1;
  transform: translateX(40%);
}

/* Unlocked: accent glow */
.achievement-card.unlocked {
  border-color: rgba(4, 207, 255, 0.22);
}
.achievement-card.unlocked:hover {
  transform: translateY(-2px);
  border-color: var(--accent-primary);
  box-shadow: 0 6px 24px rgba(4, 207, 255, 0.15);
}

/* Locked: dimmed */
.achievement-card.locked {
  opacity: 0.55;
  filter: grayscale(40%);
}
.achievement-card.locked:hover {
  opacity: 0.75;
  transform: translateY(-1px);
  filter: grayscale(20%);
}

/* Icon */
.achievement-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  object-fit: contain;
  flex-shrink: 0;
  transition: transform 0.3s ease;
}
.achievement-card.unlocked:hover .achievement-icon {
  transform: scale(1.12) rotate(-4deg);
}

/* Text content */
.achievement-content {
  min-width: 0;
}
.achievement-content h4 {
  font-family: var(--font-body);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  color: var(--text-heading);
  margin: 0 0 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.achievement-content p {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  margin: 0;
  line-height: 1.4;
}

/* Date + badge column */
.achievement-date {
  font-size: 0.7rem;
  color: var(--text-muted);
  white-space: nowrap;
}

/* "Show more" toggle */
.achievement-more {
  margin-top: 0.5rem;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  padding: 4px 14px;
  font-size: var(--font-size-xs);
  font-family: var(--font-body);
  color: var(--text-muted);
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
}
.achievement-more:hover { color: var(--accent-primary); border-color: var(--accent-primary); }

/* Reset card */
.reset-card {
  border-color: rgba(242, 156, 163, 0.2);
  opacity: 0.7;
}
.reset-card:hover { opacity: 1; border-color: rgba(242, 156, 163, 0.5); }
.achievement-reset {
  background: rgba(242, 156, 163, 0.12);
  border: 1px solid rgba(242, 156, 163, 0.3);
  border-radius: var(--radius-md);
  padding: 5px 12px;
  font-size: var(--font-size-xs);
  font-family: var(--font-body);
  color: var(--error, #F29CA3);
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
  white-space: nowrap;
}
.achievement-reset:hover {
  background: rgba(242, 156, 163, 0.22);
  border-color: rgba(242, 156, 163, 0.6);
}

/* ═══════════════════════════════════════════════════════════
   ACHIEVEMENT UNLOCK POPUP (toast-style, top-right)
   ═══════════════════════════════════════════════════════════ */

.achievement-popup {
  position: fixed;
  top: 64px;   /* below topbar */
  right: 1rem;
  z-index: var(--z-toast, 1100);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 260px;
  max-width: 340px;
  padding: 0.75rem 1rem;
  background: var(--glass-bg);
  border: 1px solid var(--border-color-strong);
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 32px rgba(0,0,0,0.35), 0 0 0 1px rgba(4,207,255,0.08);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  /* Enter from right */
  opacity: 0;
  transform: translateX(calc(100% + 1.5rem));
  transition: opacity 0.35s cubic-bezier(0.4,0,0.2,1),
              transform 0.35s cubic-bezier(0.4,0,0.2,1);
  pointer-events: none;
}
.achievement-popup.show {
  opacity: 1;
  transform: translateX(0);
  pointer-events: auto;
}

/* Accent left border that pulses on entry */
.achievement-popup::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--accent-primary), var(--accent-secondary));
  border-radius: var(--radius-lg) 0 0 var(--radius-lg);
}

.achievement-popup-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  object-fit: contain;
  flex-shrink: 0;
  animation: ach-icon-pop 0.45s cubic-bezier(0.34,1.56,0.64,1) 0.15s both;
}
@keyframes ach-icon-pop {
  from { transform: scale(0.4) rotate(-15deg); opacity: 0; }
  to   { transform: scale(1) rotate(0deg);    opacity: 1; }
}

.achievement-popup-content {
  min-width: 0;
}
.achievement-popup-content h4 {
  font-family: var(--font-body);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  color: var(--text-heading);
  margin: 0 0 2px;
}
.achievement-popup-content p {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.4;
}

/* Label above the title */
.achievement-popup::after {
  content: '🏆 Achievement Unlocked';
  position: absolute;
  top: -0.6rem;
  left: 0.9rem;
  font-size: 0.65rem;
  font-family: var(--font-body);
  font-weight: var(--font-weight-bold);
  color: var(--accent-primary);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: var(--glass-bg);
  padding: 0 6px;
  border-radius: var(--radius-full);
  line-height: 1.2;
}

/* ── Footer tooltips ───────────────────────────────────────── */

.footer-tooltips {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-color);
}

.tooltip-container { position: relative; display: inline-flex; }
.tooltip-icon { width: 22px; height: 22px; cursor: help; opacity: 0.5; transition: opacity 0.2s; }
.tooltip-icon:hover { opacity: 1; }

.tooltip {
  display: none;
  position: absolute;
  bottom: calc(100% + 8px);
  right: 0;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 0.6rem 0.85rem;
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  white-space: nowrap;
  line-height: 1.5;
  box-shadow: 0 4px 16px var(--shadow-color, rgba(0,0,0,0.2));
  z-index: 50;
}
.tooltip-container:hover .tooltip { display: block; }

/* ── Responsive ────────────────────────────────────────────── */

/* ── Medium: tablet ──────────────────────────── */
@media (max-width: 860px) {
  body { padding-top: 52px; padding-bottom: 4.5rem; }

  /* Tab nav → sticky bottom bar */
  .tabs {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    margin: 0;
    padding: 0;
    border-top: 1px solid var(--border-color);
    border-radius: 0;
    background: var(--bg-nav, rgba(11,17,23,0.92));
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    z-index: var(--z-sticky, 200);
    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-width: none;   /* Firefox */
    -ms-overflow-style: none;
    /* Add safe area inset padding for iOS home indicator */
    padding-bottom: env(safe-area-inset-bottom, 0px);
  }
  .tabs::-webkit-scrollbar { display: none; }

  .tab-link {
    padding: 0.7rem 0.85rem;
    font-size: var(--font-size-xs);
    border-radius: 0;
    border: none;
    border-top: 2px solid transparent;
    flex: 1 0 auto;
    min-width: 60px;
    text-align: center;
    justify-content: center;
    background: transparent;
  }
  .tab-link.active {
    border-top-color: var(--accent-primary);
    background: transparent;
  }
  .tab-link:hover {
    background: var(--glass-bg-hover);
    border-radius: 0;
  }
  #quit-btn {
    margin-left: 0;
    border-left: 1px solid var(--border-color);
    flex: 0 0 auto;
    min-width: 56px;
  }

  /* Main card no bottom rounding since bottom nav is flush */
  #main-container {
    padding: var(--spacing-md);
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
    margin-bottom: 0;
  }
}

/* ── Small: phone ────────────────────────────── */
@media (max-width: 520px) {
  /* Topbar: tighten */
  .arcade-topbar { padding: 0 0.6rem; }
  .arcade-topbar-title { display: none; }   /* save horizontal space */
  .arcade-back-btn { padding: 5px 10px; font-size: var(--font-size-xs); }
  .arcade-theme-toggle { padding: 5px 8px; font-size: 0.9rem; gap: 0; }
  /* Hide the text label inside toggle on very small screens */
  .arcade-theme-toggle .theme-label { display: none; }

  /* Tab labels: shorten */
  .tab-link[data-tab="highscore-screen"] .tab-label { display: none; }
  .tab-link[data-tab="achievements-screen"] .tab-label { display: none; }
  .tab-link[data-tab="highscore-screen"]::before { content: '🏆'; }
  .tab-link[data-tab="achievements-screen"]::before { content: '⭐'; }

  /* Start screen */
  .heading-style-1 { font-size: var(--font-size-2xl); }
  .game-title { font-size: 1.4rem; }
  .game-logo { width: 80px; }
  .pong-element-badge { min-width: 56px; padding: 7px 8px; }
  .pong-element-badge img { width: 32px; height: 32px; }
  .pong-tagline { font-size: var(--font-size-xs); }

  /* Game over stats: single column */
  #snake-gameover .modal-content ul { grid-template-columns: 1fr; }

  /* Canvas: let it scale down on narrow screens */
  #game-canvas { width: 100%; height: auto; }

  /* Help modal */
  .modal-content { margin: 4% auto; padding: var(--spacing-md); }
  .help-grid { grid-template-columns: 1fr; }

  /* Options: full width */
  #options-screen { max-width: 100%; }
}

/* ── Monochrome mode ───────────────────────────────────────── */
body.monochrome {
  filter: grayscale(100%);
}

/* ── Reduced motion ────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-delay: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  /* Title letters/num have opacity:0 as animation start — ensure they're visible */
  .game-title__letter,
  .game-title__num,
  .main-heading .game-logo {
    opacity: 1 !important;
    transform: none !important;
  }
  .game-title {
    animation: none !important;
  }
}