/* ==========================================================================
   Klotski Grandmaster CSS
   ========================================================================== */

:root {
  color-scheme: dark;
  --bg-gradient: linear-gradient(135deg, #0a0813 0%, #120e24 50%, #080611 100%);
  --accent-color: #8e54e9;
  --accent-color-glow: rgba(142, 84, 233, 0.4);
  --accent-pink: #ff4b2b;
  --accent-pink-glow: rgba(255, 75, 43, 0.4);
  
  --text-primary: #f3f1f9;
  --text-secondary: #9c98b6;
  
  --glass-bg: rgba(255, 255, 255, 0.02);
  --glass-border: rgba(200, 200, 210, 0.25);
  --glass-highlight: rgba(255, 255, 255, 0.03);
  --board-bg: #050409;
  --grid-line: rgba(255, 255, 255, 0.02);
  --cell-border: rgba(180, 180, 190, 0.25);
  --cell-glow: rgba(180, 180, 190, 0.08);
  --cell-bg: rgba(180, 180, 190, 0.06);
  --panel-bg: rgba(255, 255, 255, 0.01);
  --panel-border: rgba(255, 255, 255, 0.03);
  --control-bg: rgba(255, 255, 255, 0.03);
  --control-bg-strong: rgba(255, 255, 255, 0.06);
  --control-hover-bg: rgba(255, 255, 255, 0.1);
  --select-option-bg: #120e24;
  --overlay-bg: rgba(10, 8, 19, 0.85);
  --footer-text: rgba(255, 255, 255, 0.15);
  --scrollbar-track: rgba(255, 255, 255, 0.03);
  --scrollbar-thumb: rgba(255, 255, 255, 0.14);
  --switch-bg: rgba(255, 255, 255, 0.04);
  --switch-border: rgba(255, 255, 255, 0.08);

  --cell-size: 80px;
  --bg-bottom: #090712;
  --board-border-color: rgba(200, 200, 210, 0.25);
}

:root[data-theme='dark'] {
  color-scheme: dark;
}

:root[data-theme='light'] {
  color-scheme: light;
  --bg-gradient: linear-gradient(135deg, #eef4ff 0%, #f8fbff 52%, #edf1f8 100%);
  --accent-color: #4f6edb;
  --accent-color-glow: rgba(79, 110, 219, 0.28);
  --accent-pink: #d84a32;
  --accent-pink-glow: rgba(216, 74, 50, 0.28);
  --text-primary: #1d2433;
  --text-secondary: #657086;
  --glass-bg: rgba(255, 255, 255, 0.72);
  --glass-border: rgba(35, 48, 78, 0.13);
  --glass-highlight: rgba(255, 255, 255, 0.6);
  --board-bg: #f6f8fc;
  --grid-line: rgba(29, 36, 51, 0.055);
  --cell-border: rgba(29, 36, 51, 0.08);
  --cell-glow: rgba(255, 255, 255, 0.75);
  --cell-bg: rgba(29, 36, 51, 0.018);
  --panel-bg: rgba(255, 255, 255, 0.58);
  --panel-border: rgba(35, 48, 78, 0.1);
  --control-bg: rgba(255, 255, 255, 0.74);
  --control-bg-strong: rgba(255, 255, 255, 0.92);
  --control-hover-bg: rgba(79, 110, 219, 0.1);
  --select-option-bg: #ffffff;
  --overlay-bg: rgba(246, 248, 252, 0.86);
  --footer-text: rgba(29, 36, 51, 0.36);
  --scrollbar-track: rgba(29, 36, 51, 0.06);
  --scrollbar-thumb: rgba(29, 36, 51, 0.22);
  --switch-bg: rgba(29, 36, 51, 0.08);
  --switch-border: rgba(29, 36, 51, 0.12);
  --bg-bottom: #f2f5fb;
  --board-border-color: rgba(142, 84, 233, 0.15);
}

@media (prefers-color-scheme: light) {
  :root[data-theme='system'] {
    color-scheme: light;
    --bg-gradient: linear-gradient(135deg, #eef4ff 0%, #f8fbff 52%, #edf1f8 100%);
    --accent-color: #4f6edb;
    --accent-color-glow: rgba(79, 110, 219, 0.28);
    --accent-pink: #d84a32;
    --accent-pink-glow: rgba(216, 74, 50, 0.28);
    --text-primary: #1d2433;
    --text-secondary: #657086;
    --glass-bg: rgba(255, 255, 255, 0.72);
    --glass-border: rgba(35, 48, 78, 0.13);
    --glass-highlight: rgba(255, 255, 255, 0.6);
    --board-bg: #f6f8fc;
    --grid-line: rgba(29, 36, 51, 0.055);
    --cell-border: rgba(29, 36, 51, 0.08);
    --cell-glow: rgba(255, 255, 255, 0.75);
    --cell-bg: rgba(29, 36, 51, 0.018);
    --panel-bg: rgba(255, 255, 255, 0.58);
    --panel-border: rgba(35, 48, 78, 0.1);
    --control-bg: rgba(255, 255, 255, 0.74);
    --control-bg-strong: rgba(255, 255, 255, 0.92);
    --control-hover-bg: rgba(79, 110, 219, 0.1);
    --select-option-bg: #ffffff;
    --overlay-bg: rgba(246, 248, 252, 0.86);
    --footer-text: rgba(29, 36, 51, 0.36);
    --scrollbar-track: rgba(29, 36, 51, 0.06);
    --scrollbar-thumb: rgba(29, 36, 51, 0.22);
    --switch-bg: rgba(29, 36, 51, 0.08);
    --switch-border: rgba(29, 36, 51, 0.12);
    --bg-bottom: #f2f5fb;
    --board-border-color: rgba(142, 84, 233, 0.15);
  }
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg-gradient);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  overflow-x: hidden;
  overflow-y: auto;
}

.app-container {
  width: 100%;
  min-height: 100vh;
  min-height: 100dvh;
  padding: clamp(14px, 2.5vh, 28px) 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

@media (max-height: 800px) {
  .app-container {
    justify-content: flex-start;
    padding-top: 60px;
  }
}

/* Header */
.app-header {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  margin-bottom: 28px;
}

.glow-text {
  font-family: 'Noto Serif SC', serif;
  font-size: 3.5rem;
  font-weight: 900;
  letter-spacing: 0.2rem;
  color: var(--text-secondary);
}

.subtitle {
  font-size: 1.1rem;
  font-weight: 300;
  letter-spacing: 0.3rem;
  color: var(--text-secondary);
  text-transform: uppercase;
}

/* Main Content Layout */
.main-content {
  display: flex;
  gap: 100px;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

@media (max-width: 768px) {
  .main-content {
    flex-direction: column;
    align-items: center;
    gap: 30px;
    min-height: auto;
  }

  .controls-section {
    width: 100%;
    max-width: 400px;
    padding: 0 20px;
    justify-content: flex-start;
  }
}

@media (min-width: 769px) and (max-height: 760px) {
  .app-container {
    padding-block: 12px;
  }

  .main-content {
    gap: 60px;
  }

  .app-header {
    margin-bottom: 18px;
  }

  .glow-text {
    font-size: 2.8rem;
  }

  .subtitle {
    font-size: 0.95rem;
  }

  .glass-card {
    padding: 20px;
  }

  .glass-card {
    gap: 14px;
  }

  .status-panel {
    padding: 14px;
  }

  .btn {
    min-height: 42px;
    padding: 10px 14px;
  }
}

/* Board Section */
.board-section {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  flex-shrink: 0;
}

.board-wrapper {
  position: relative;
  padding: 16px;
  background: rgba(142, 84, 233, 0.05);
  border: 1px solid var(--board-border-color);
  border-radius: 24px;
  box-shadow:
    0 12px 32px rgba(0, 0, 0, 0.15),
    0 0 20px rgba(142, 84, 233, 0.03);
  flex-shrink: 0;
}

:root:not([data-theme='light']) .board-wrapper {
  background: rgba(200, 200, 210, 0.08);
  border: 1px solid var(--board-border-color);
}

@media (prefers-color-scheme: light) {
  :root[data-theme='system'] .board-wrapper {
    background: rgba(142, 84, 233, 0.05);
    border: 1px solid var(--board-border-color);
  }
}

/* Exit chute gateway at the bottom center of the board wrapper */
.board-wrapper::before {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 18px;
  pointer-events: none;
  background:
    /* Left chute wall: 1px wide vertical line at X = 96px */
    linear-gradient(to right, var(--board-border-color), var(--board-border-color)) 96px 0 / 1px 17px no-repeat,
    /* Right chute wall: 1px wide vertical line at X = 256px */
    linear-gradient(to right, var(--board-border-color), var(--board-border-color)) 256px 0 / 1px 17px no-repeat,
    /* Bottom border cover: hides the border from X = 97px to 255px */
    linear-gradient(to right, var(--bg-bottom), var(--bg-bottom)) 97px 17px / 158px 1px no-repeat,
    /* Chute floor background: matches the cell background level */
    linear-gradient(to right, var(--cell-bg), var(--cell-bg)) 97px 0 / 158px 17px no-repeat;
  z-index: 1;
}

.game-board {
  position: relative;
  width: calc(4 * var(--cell-size));
  height: calc(5 * var(--cell-size));
  background-color: var(--board-bg);
  border-radius: 12px;
  cursor: default;
  box-shadow: inset 0 0 15px rgba(0, 0, 0, 0.2);
  /* Elegant grid overlay background */
  background-size: var(--cell-size) var(--cell-size);
  background-image: 
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
}

.board-cell {
  position: absolute;
  width: var(--cell-size);
  height: var(--cell-size);
  border: 1px solid var(--cell-border);
  background:
    radial-gradient(circle at 50% 45%, var(--cell-glow), transparent 62%),
    var(--cell-bg);
  pointer-events: none;
  z-index: 0;
}

.board-cell.escape-cell {
  background: var(--cell-bg);
  border-color: var(--cell-border);
}

.board-cell.exit-cell {
  border-bottom: none;
}

.board-cell.exit-left {
  border-right: none;
}

.board-cell.exit-right {
  border-left: none;
}

/* Blocks */
.block {
  position: absolute;
  border-radius: 10px;
  border: 1.5px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: center;
  align-items: center;
  user-select: none;
  cursor: pointer;
  z-index: 2;
  touch-action: none;
  /* Multi-stage animation transition */
  transition: 
    left 0.35s cubic-bezier(0.25, 1, 0.5, 1), 
    top 0.35s cubic-bezier(0.25, 1, 0.5, 1), 
    transform 0.2s ease, 
    box-shadow 0.2s ease;
  overflow: hidden;
}

.block.dragging {
  transition: none !important;
}

.block::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 50%;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0.12), transparent);
  border-radius: 8px 8px 0 0;
  pointer-events: none;
}

.block:hover {
  transform: scale(0.98);
  filter: brightness(1.08);
}

.block:focus,
.block:active {
  z-index: 50;
}

/* Block Types Styling */
/* 2x2: Cao Cao */
.block-caocao {
  background: linear-gradient(135deg, #ff416c 0%, #ff4b2b 100%);
  box-shadow: 0 8px 20px var(--accent-pink-glow);
  border-color: rgba(255, 255, 255, 0.25);
  z-index: 10;
}
/* 2x1: Vertical General */
.block-vertical {
  background: linear-gradient(135deg, #3a7bd5 0%, #3a6073 100%);
  box-shadow: 0 6px 15px rgba(58, 123, 213, 0.25);
  z-index: 5;
}
/* 1x2: Horizontal General */
.block-horizontal {
  background: linear-gradient(135deg, #00c6ff 0%, #0072ff 100%);
  box-shadow: 0 6px 15px rgba(0, 114, 255, 0.25);
  z-index: 5;
}
/* 1x1: Soldier */
.block-soldier {
  background: linear-gradient(135deg, #f5af19 0%, #e65c00 100%);
  box-shadow: 0 4px 10px rgba(230, 92, 0, 0.25);
  z-index: 3;
}
/* Cao Cao completion celebration */
.block-caocao.completed {
  animation: caocao-complete 0.8s ease-out;
  box-shadow: 0 0 40px rgba(255, 75, 43, 0.8), 0 0 80px rgba(255, 75, 43, 0.4);
}
@keyframes caocao-complete {
  0% {
    transform: scale(1);
    box-shadow: 0 8px 20px var(--accent-pink-glow);
  }
  50% {
    transform: scale(1.05);
    box-shadow: 0 0 50px rgba(255, 75, 43, 0.9), 0 0 100px rgba(255, 75, 43, 0.5);
  }
  100% {
    transform: scale(1);
    box-shadow: 0 0 40px rgba(255, 75, 43, 0.8), 0 0 80px rgba(255, 75, 43, 0.4);
  }
}
/* Board Completion Overlay */
.board-overlay {
  position: absolute;
  top: 16px;
  left: 16px;
  right: 16px;
  bottom: 16px;
  background: var(--overlay-bg);
  backdrop-filter: blur(8px);
  border-radius: 12px;
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 20;
  transition: opacity 0.3s ease;
  border: 1px solid rgba(142, 84, 233, 0.25);
}

.overlay-content {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px;
}

.overlay-title {
  font-family: 'Outfit', sans-serif;
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent-pink);
  text-shadow: 0 0 15px var(--accent-pink-glow);
}

.overlay-subtitle {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* Controls Section */
.controls-section {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 20px;
  width: 400px;
}

.glass-card {
  background: transparent;
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 30px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
  backdrop-filter: blur(10px);
}

.glass-card h2 {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: 0.05rem;
}

.create-description {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.45;
}

.create-validation-message {
  padding: 10px 12px;
  border: 1px solid rgba(255, 75, 43, 0.3);
  border-radius: 10px;
  background: rgba(255, 75, 43, 0.08);
  color: #ff9e8d;
  font-size: 0.9rem;
  line-height: 1.35;
}

.create-min-moves {
  padding: 10px 12px;
  border: 1px solid rgba(142, 84, 233, 0.22);
  border-radius: 10px;
  background: rgba(142, 84, 233, 0.08);
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1.35;
}

.glass-card.create-mode-active > :not(h2):not(.create-description):not(.create-palette):not(.create-validation-message):not(.create-min-moves):not(.create-actions) {
  display: none;
}

.glass-card.create-mode-active {
  gap: 16px;
}

.create-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

#create-game-btn {
  grid-column: 1 / -1;
}

/* Theme Toggle Button */
.theme-toggle {
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 100;
  width: 44px;
  height: 44px;
  border: 1px solid var(--glass-border);
  border-radius: 50%;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.theme-toggle:hover {
  background: var(--control-hover-bg);
  transform: scale(1.05);
}

.theme-toggle:active {
  transform: scale(0.95);
}

.theme-icon {
  width: 22px;
  height: 22px;
  color: var(--text-primary);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.sun-icon {
  position: absolute;
}

.moon-icon {
  position: absolute;
}

/* Light mode: show sun, hide moon */
:root[data-theme='light'] .sun-icon,
:root[data-theme='system'] .sun-icon {
  opacity: 1;
  transform: rotate(0deg);
}

:root[data-theme='light'] .moon-icon,
:root[data-theme='system'] .moon-icon {
  opacity: 0;
  transform: rotate(-90deg);
}

/* Dark mode: show moon, hide sun */
:root[data-theme='dark'] .sun-icon {
  opacity: 0;
  transform: rotate(90deg);
}

:root[data-theme='dark'] .moon-icon {
  opacity: 1;
  transform: rotate(0deg);
}

/* System preference dark: show moon */
@media (prefers-color-scheme: dark) {
  :root[data-theme='system'] .sun-icon {
    opacity: 0;
    transform: rotate(90deg);
  }

  :root[data-theme='system'] .moon-icon {
    opacity: 1;
    transform: rotate(0deg);
  }
}

.create-palette {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  align-items: end;
  min-height: 84px;
}

.palette-piece {
  justify-self: center;
  border-radius: 8px;
  border: 1.5px solid rgba(255, 255, 255, 0.12);
  color: #ffffff;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: 'Noto Serif SC', serif;
  font-weight: 700;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.55);
  cursor: grab;
  user-select: none;
  touch-action: none;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.24);
}

.palette-piece.disabled {
  cursor: not-allowed;
  opacity: 0.35;
  filter: grayscale(0.6);
}

.palette-caocao {
  width: 58px;
  height: 58px;
  background: linear-gradient(135deg, #ff416c 0%, #ff4b2b 100%);
}

.palette-vertical {
  width: 34px;
  height: 68px;
  background: linear-gradient(135deg, #3a7bd5 0%, #3a6073 100%);
}

.palette-horizontal {
  width: 68px;
  height: 34px;
  background: linear-gradient(135deg, #00c6ff 0%, #0072ff 100%);
}

.palette-soldier {
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, #f5af19 0%, #e65c00 100%);
}

.palette-ghost {
  position: fixed;
  z-index: 100;
  pointer-events: none;
  border-radius: 10px;
  border: 1.5px solid rgba(255, 255, 255, 0.2);
  background: rgba(142, 84, 233, 0.2);
  backdrop-filter: blur(8px);
  color: #ffffff;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: 'Noto Serif SC', serif;
  font-size: 1.3rem;
  font-weight: 700;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.6);
}

.game-board.create-mode {
  cursor: crosshair;
}

/* Beautiful custom select */
.select-wrapper {
  position: relative;
  width: 100%;
}

.select-wrapper::after {
  content: '▼';
  font-size: 0.7rem;
  color: var(--text-secondary);
  position: absolute;
  right: 15px;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
}

#game-selector {
  width: 100%;
  padding: 14px 20px;
  font-size: 1rem;
  background: var(--control-bg);
  border: 1px solid var(--glass-border);
  border-radius: 10px;
  color: var(--text-primary);
  appearance: none;
  cursor: pointer;
  transition: border-color 0.2s, background-color 0.2s;
}

#game-selector:focus {
  outline: none;
  border-color: var(--accent-color);
  background: var(--control-bg-strong);
}

#game-selector option {
  background-color: var(--select-option-bg);
  color: var(--text-primary);
}

/* Status Panel */
.status-panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--panel-bg);
  padding: 18px;
  border-radius: 12px;
  border: 1px solid var(--panel-border);
}

.status-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.95rem;
}

.status-label {
  color: var(--text-secondary);
}

.status-value {
  font-weight: 600;
}

.badge {
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 0.8rem;
  text-transform: uppercase;
}

.mode-forward {
  background: rgba(142, 84, 233, 0.15);
  color: #c7a4ff;
  border: 1px solid rgba(142, 84, 233, 0.3);
}

.mode-reverse {
  background: rgba(255, 75, 43, 0.15);
  color: #ff9e8d;
  border: 1px solid rgba(255, 75, 43, 0.3);
}

.mode-manual {
  background: rgba(245, 175, 25, 0.15);
  color: #ffd875;
  border: 1px solid rgba(245, 175, 25, 0.3);
}

/* Buttons */
.action-buttons {
  display: grid;
  grid-template-columns: 1fr 1.2fr 1fr;
  gap: 12px;
}

.btn {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  padding: 14px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 10px;
  border: none;
  cursor: pointer;
  transition: transform 0.1s, filter 0.2s, background-color 0.2s;
  color: #ffffff;
}

.btn:active {
  transform: scale(0.96);
}

.btn:disabled {
  cursor: not-allowed;
  opacity: 0.45;
  filter: grayscale(0.5);
  transform: none;
}

.btn-primary {
  background: var(--accent-color);
  box-shadow: 0 4px 15px var(--accent-color-glow);
}

.btn-primary:hover {
  filter: brightness(1.15);
}

.btn-secondary {
  background: var(--control-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: var(--control-hover-bg);
}

.btn-danger {
  background: transparent;
  border: 1.5px solid rgba(255, 75, 43, 0.4);
  color: #ff765e;
  padding: 12px;
}

.btn-danger:hover {
  background: rgba(255, 75, 43, 0.1);
}

.help-dialog {
  width: min(560px, calc(100vw - 32px));
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  margin: auto;
  padding: 0;
  background: var(--glass-bg);
  color: var(--text-primary);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(14px);
}

.help-dialog::backdrop {
  background: rgba(0, 0, 0, 0.55);
}

.help-dialog-content {
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: 24px;
}

.help-dialog-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border-bottom: 1px solid var(--glass-border);
  padding-bottom: 12px;
}

.dialog-title {
  font-size: 1.25rem !important;
  font-weight: 700 !important;
  color: var(--text-primary);
}

.help-dialog-body {
  max-height: clamp(300px, 60vh, 520px);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding-right: 8px;
  scrollbar-width: thin;
  scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
}

.help-dialog-body::-webkit-scrollbar {
  width: 6px;
}

.help-dialog-body::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
  border-radius: 4px;
}

.help-dialog-body::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 4px;
}

.help-section {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.help-section h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--accent-color);
  text-transform: uppercase;
  letter-spacing: 0.05rem;
}

.help-section p {
  font-size: 0.92rem;
  line-height: 1.5;
  color: var(--text-secondary);
}

.help-section ul {
  list-style: disc;
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.92rem;
  line-height: 1.45;
  color: var(--text-secondary);
}

.help-section li strong {
  color: var(--text-primary);
}

.help-defs {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.help-defs dt {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.help-defs dd {
  font-size: 0.9rem;
  line-height: 1.45;
  color: var(--text-secondary);
  margin-left: 0;
}

.help-attribution {
  padding-top: 14px;
  border-top: 1px solid var(--glass-border);
  color: var(--footer-text);
  font-size: 0.82rem;
  line-height: 1.4;
}

.dialog-close-btn {
  width: 34px;
  height: 34px;
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  background: var(--control-bg);
  color: var(--text-primary);
  font-size: 1.4rem;
  line-height: 1;
  cursor: pointer;
}

.dialog-close-btn:hover {
  background: var(--control-hover-bg);
}

/* GitHub Link */
.app-footer {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 100;
  font-size: 0.8rem;
  color: var(--footer-text);
}

.github-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--glass-border);
  border-radius: 50%;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  color: var(--text-primary);
  text-decoration: none;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.github-link:hover {
  background: var(--control-hover-bg);
  transform: scale(1.05);
}

.github-link:active {
  transform: scale(0.95);
}

.github-link span {
  display: none;
}

.github-link svg {
  width: 22px;
  height: 22px;
}

/* Utility Helpers */
.hidden {
  display: none !important;
}

.transparent {
  opacity: 0 !important;
  pointer-events: none;
}

/* Step Highlights & Click Animations */
.next-up {
  outline: 3px solid rgba(255, 255, 255, 0.85);
  outline-offset: -3px;
  animation: pulse-border 1.5s infinite ease-in-out;
}

@keyframes pulse-border {
  0% {
    outline-color: rgba(255, 255, 255, 0.4);
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.1);
  }
  50% {
    outline-color: rgba(255, 255, 255, 0.9);
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.3);
  }
  100% {
    outline-color: rgba(255, 255, 255, 0.4);
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.1);
  }
}

.shake {
  animation: shake-anim 0.25s ease-in-out;
}

@keyframes shake-anim {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-6px); }
  40%, 80% { transform: translateX(6px); }
}

/* Custom Toggle Switch */
.toggle-container {
  gap: 12px;
}

.toggle-label {
  font-size: 0.95rem;
  color: var(--text-secondary);
  user-select: none;
}

.switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--switch-bg);
  border: 1.5px solid var(--switch-border);
  transition: .3s;
  border-radius: 24px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 14px;
  width: 14px;
  left: 3.5px;
  bottom: 3.5px;
  background-color: var(--text-primary);
  transition: .3s;
  border-radius: 50%;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.4);
}

input:checked + .slider {
  background-color: var(--accent-color);
  border-color: rgba(142, 84, 233, 0.5);
  box-shadow: 0 0 10px rgba(142, 84, 233, 0.3);
}

input:checked + .slider:before {
  transform: translateX(20px);
}