/* Design System & Variables */
:root {
  --bg-primary: #0f172a;
  --bg-gradient: radial-gradient(circle at 50% 20%, #1e1b4b 0%, #090d16 100%);
  --color-primary: #a78bfa;
  --color-primary-glow: rgba(167, 139, 250, 0.3);
  --color-secondary: #22d3ee;
  --color-secondary-glow: rgba(34, 211, 238, 0.3);
  --color-success: #34d399;
  --color-success-glow: rgba(52, 211, 153, 0.2);
  --color-error: #f87171;
  --color-error-glow: rgba(248, 113, 113, 0.2);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --card-bg: rgba(30, 41, 59, 0.45);
  --card-border: rgba(255, 255, 255, 0.08);
  --card-blur: blur(16px);
  --shadow-premium: 0 8px 32px 0 rgba(0, 0, 0, 0.5);
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --keyboard-bg: #1e293b;
  --keyboard-active: #334155;
  --ladder-line: rgba(148, 163, 184, 0.15);
}

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

body {
  font-family: 'Plus Jakarta Sans', sans-serif;
  background: var(--bg-primary);
  background-image: var(--bg-gradient);
  color: var(--text-main);
  min-height: 100vh;
  min-height: -webkit-fill-available;
  display: flex;
  justify-content: center;
  overflow-x: hidden;
}

/* App Container */
.app-container {
  width: 100%;
  max-width: 500px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 0 16px;
  position: relative;
}

/* Header */
.app-header {
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--card-border);
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(9, 13, 22, 0.8);
  backdrop-filter: blur(8px);
}

.logo {
  font-family: 'Outfit', sans-serif;
  font-weight: 800;
  font-size: 1.6rem;
  letter-spacing: 1.5px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: flex;
  align-items: center;
  gap: 6px;
}

.logo-emoji {
  -webkit-text-fill-color: initial;
  font-size: 1.3rem;
}

.icon-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.25rem;
  cursor: pointer;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-smooth);
}

.icon-btn:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.05);
}

.icon-btn:active {
  transform: scale(0.9);
}

/* Game Area */
.game-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 16px 0;
  justify-content: space-between;
  gap: 16px;
}

/* Challenge Info Header */
.challenge-info {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  text-align: center;
}

.challenge-badge {
  background: linear-gradient(135deg, rgba(167, 139, 250, 0.15), rgba(34, 211, 238, 0.15));
  border: 1px solid var(--card-border);
  color: var(--color-primary);
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 4px 12px;
  border-radius: 100px;
  box-shadow: 0 0 12px rgba(167, 139, 250, 0.1);
}

.target-steps-info {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.target-steps-info strong {
  color: var(--text-main);
}

/* Word Ladder */
.ladder-container {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px 0;
  position: relative;
  min-height: 250px;
}

.word-ladder {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  max-width: 280px;
  position: relative;
}

/* Virtual vertical rails for the ladder */
.word-ladder::before, .word-ladder::after {
  content: '';
  position: absolute;
  top: 15px;
  bottom: 15px;
  width: 3px;
  background: var(--ladder-line);
  box-shadow: 0 0 8px rgba(255, 255, 255, 0.02);
  z-index: 1;
}

.word-ladder::before {
  left: 20px;
}

.word-ladder::after {
  right: 20px;
}

/* Ladder Rung Card */
.ladder-rung {
  background: var(--card-bg);
  backdrop-filter: var(--card-blur);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 2;
  box-shadow: var(--shadow-premium);
  transition: var(--transition-smooth);
  animation: slideUp 0.4s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.rung-word {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 1.4rem;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--text-main);
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}

/* Fixed Start/End Rungs */
.start-rung {
  background: linear-gradient(135deg, rgba(167, 139, 250, 0.15) 0%, rgba(30, 41, 59, 0.8) 100%);
  border: 1.5px solid var(--color-primary);
  box-shadow: 0 0 15px var(--color-primary-glow);
}

.start-rung .rung-word {
  color: var(--color-primary);
}

.end-rung {
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.15) 0%, rgba(30, 41, 59, 0.8) 100%);
  border: 1.5px solid var(--color-secondary);
  box-shadow: 0 0 15px var(--color-secondary-glow);
}

.end-rung .rung-word {
  color: var(--color-secondary);
}

/* User added Rungs */
.user-rung {
  border-left: 3px solid var(--color-primary);
}

/* Active Input Rung */
.input-rung {
  background: rgba(30, 41, 59, 0.6);
  border: 1.5px dashed var(--text-muted);
  box-shadow: none;
  display: flex;
  gap: 8px;
  padding: 0 30px;
}

.input-rung.active {
  border-color: var(--color-primary);
  box-shadow: 0 0 10px var(--color-primary-glow);
  animation: pulse-border 1.5s infinite alternate;
}

.letter-box {
  width: 32px;
  height: 36px;
  border: 1.5px solid rgba(255, 255, 255, 0.15);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 1.25rem;
  text-transform: uppercase;
  color: var(--text-main);
  background: rgba(15, 23, 42, 0.5);
  transition: var(--transition-smooth);
}

.letter-box.filled {
  border-color: var(--color-primary);
  animation: popIn 0.15s ease-out;
}

/* Actions Controls */
.game-controls {
  width: 100%;
}

.actions-row {
  display: flex;
  gap: 12px;
  justify-content: center;
}

.control-btn {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  color: var(--text-main);
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition-smooth);
  backdrop-filter: var(--card-blur);
}

.control-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.2);
}

.control-btn:active {
  transform: scale(0.95);
}

.btn-danger {
  color: var(--color-error);
  border-color: rgba(248, 113, 113, 0.2);
}

.btn-danger:hover {
  background: rgba(248, 113, 113, 0.1);
  border-color: var(--color-error);
}

/* Keyboard styling */
.keyboard-container {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
}

.keyboard-row {
  display: flex;
  justify-content: center;
  gap: 6px;
  width: 100%;
}

.key {
  font-family: inherit;
  font-weight: 600;
  font-size: 1.15rem;
  height: 48px;
  flex: 1;
  max-width: 42px;
  border: none;
  background-color: var(--keyboard-bg);
  color: var(--text-main);
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  text-transform: lowercase;
  transition: background-color 0.1s, transform 0.05s;
  user-select: none;
}

.key:hover {
  background-color: var(--keyboard-active);
}

.key:active {
  transform: scale(0.9);
  background-color: var(--color-primary);
}

.large-key {
  max-width: 65px;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
}

/* Modals */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(9, 13, 22, 0.7);
  backdrop-filter: blur(10px);
  z-index: 100;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.modal.show {
  display: flex;
}

.modal-content {
  background: rgba(17, 24, 39, 0.8);
  border: 1px solid var(--card-border);
  border-radius: 20px;
  width: 100%;
  max-width: 440px;
  padding: 24px;
  box-shadow: var(--shadow-premium);
  position: relative;
  animation: modalScaleIn 0.3s cubic-bezier(0.34, 1.56, 0.64, 1) both;
  max-height: 90vh;
  overflow-y: auto;
}

.close-btn {
  position: absolute;
  top: 16px;
  right: 20px;
  font-size: 2rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition-smooth);
}

.close-btn:hover {
  color: var(--text-main);
}

.modal-content h2 {
  font-family: 'Outfit', sans-serif;
  font-weight: 800;
  margin-bottom: 16px;
  font-size: 1.5rem;
  text-align: center;
}

.modal-content p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.5;
  margin-bottom: 16px;
}

.modal-subtitle {
  text-align: center;
  margin-top: -8px;
}

/* Help Modal Examples */
.rules-box {
  background: rgba(255, 255, 255, 0.03);
  border-radius: 12px;
  padding: 12px 16px;
  margin-bottom: 16px;
  border-left: 4px solid var(--color-primary);
}

.rules-box h3 {
  font-size: 0.95rem;
  margin-bottom: 6px;
  color: var(--text-main);
}

.rules-box ul {
  list-style: none;
  font-size: 0.85rem;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.rules-box ul li {
  position: relative;
  padding-left: 14px;
}

.rules-box ul li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--color-primary);
}

.example-ladder {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
  margin: 16px 0;
}

.example-rung {
  background: rgba(255, 255, 255, 0.05);
  border-radius: 8px;
  padding: 6px 14px;
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 2px;
  text-align: center;
  width: 160px;
  position: relative;
}

.example-rung.start {
  border: 1px solid var(--color-primary);
}

.example-rung.end {
  border: 1px solid var(--color-secondary);
}

.example-rung .highlight {
  color: var(--color-primary);
}

.example-rung small {
  font-size: 0.65rem;
  font-weight: 400;
  color: var(--text-muted);
  letter-spacing: 0;
  margin-left: 4px;
}

.modal-footer-text {
  text-align: center;
  font-size: 0.8rem !important;
  color: var(--color-primary) !important;
  margin-top: 10px;
}

.modal-btn {
  background: linear-gradient(135deg, #8b5cf6 0%, #06b6d4 100%);
  color: var(--text-main);
  border: none;
  padding: 12px;
  border-radius: 10px;
  font-weight: 700;
  font-size: 0.95rem;
  width: 100%;
  cursor: pointer;
  box-shadow: 0 4px 15px rgba(139, 92, 246, 0.3);
  transition: var(--transition-smooth);
}

.modal-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(139, 92, 246, 0.5);
}

.modal-btn:active {
  transform: translateY(0);
}

/* Username submit form */
.congrats-title {
  color: var(--color-success);
}

.submit-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 16px;
}

.submit-form input {
  background: rgba(0, 0, 0, 0.25);
  border: 1.5px solid var(--card-border);
  border-radius: 10px;
  padding: 12px;
  color: var(--text-main);
  font-family: inherit;
  font-size: 1.1rem;
  text-align: center;
  outline: none;
  transition: var(--transition-smooth);
}

.submit-form input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 10px var(--color-primary-glow);
}

.error-text {
  color: var(--color-error);
  font-size: 0.85rem;
  text-align: center;
  margin-top: -4px;
}

/* Stats Modal Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin: 16px 0 24px;
}

.stat-box {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--card-border);
  border-radius: 10px;
  padding: 8px 4px;
  text-align: center;
}

.stat-val {
  font-family: 'Outfit', sans-serif;
  font-weight: 800;
  font-size: 1.4rem;
  color: var(--color-primary);
}

.stat-lbl {
  font-size: 0.65rem;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-top: 2px;
}

.steps-distribution-container {
  margin-bottom: 20px;
}

.steps-distribution-container h3 {
  font-size: 0.95rem;
  margin-bottom: 12px;
  color: var(--text-main);
  text-align: center;
}

.distribution-chart {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.chart-row {
  display: flex;
  align-items: center;
  font-size: 0.8rem;
  gap: 8px;
}

.chart-label {
  width: 40px;
  text-align: right;
  color: var(--text-muted);
}

.chart-bar-container {
  flex: 1;
}

.chart-bar {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-main);
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  text-align: right;
  min-width: 20px;
  width: 0%; /* Dynamic */
  transition: width 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.chart-bar.highlighted {
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  box-shadow: 0 0 10px rgba(167, 139, 250, 0.2);
}

.divider {
  border-top: 1px solid var(--card-border);
  margin: 16px 0;
}

.next-challenge-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.countdown-container {
  display: flex;
  flex-direction: column;
}

.countdown-lbl {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.countdown-val {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--text-main);
}

.share-btn {
  background: linear-gradient(135deg, var(--color-success) 0%, #10b981 100%);
  color: var(--text-main);
  border: none;
  padding: 10px 20px;
  border-radius: 8px;
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  box-shadow: 0 4px 12px var(--color-success-glow);
  display: flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition-smooth);
}

.share-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(52, 211, 153, 0.4);
}

.share-btn:active {
  transform: translateY(0);
}

/* Leaderboard Modal Table */
.leaderboard-date-label {
  text-align: center;
  font-size: 0.85rem;
  margin-top: -12px;
  margin-bottom: 16px;
  color: var(--color-primary);
}

.leaderboard-table-container {
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  max-height: 350px;
  overflow-y: auto;
}

.leaderboard-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  text-align: left;
}

.leaderboard-table th {
  padding: 12px 16px;
  border-bottom: 1.5px solid var(--card-border);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.leaderboard-table td {
  padding: 12px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
  color: var(--text-main);
}

.leaderboard-table tr:last-child td {
  border-bottom: none;
}

.leaderboard-table .loading-row {
  text-align: center;
  color: var(--text-muted);
}

.leaderboard-table .loading-row td {
  padding: 40px;
}

.trophy-cell {
  font-size: 1.1rem;
}
.gold { color: #f59e0b; }
.silver { color: #94a3b8; }
.bronze { color: #b45309; }

.user-highlight-row {
  background: rgba(167, 139, 250, 0.1);
}

.user-highlight-row td {
  font-weight: 600;
}

/* Toast Notification */
.toast-message {
  position: absolute;
  top: 80px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(15, 23, 42, 0.95);
  border: 1.5px solid var(--color-primary);
  padding: 12px 24px;
  border-radius: 100px;
  color: var(--text-main);
  font-weight: 600;
  font-size: 0.85rem;
  box-shadow: var(--shadow-premium), 0 0 15px var(--color-primary-glow);
  z-index: 50;
  white-space: nowrap;
  pointer-events: none;
  opacity: 1;
  transition: opacity 0.2s ease-out;
}

.toast-message.error {
  border-color: var(--color-error);
  box-shadow: var(--shadow-premium), 0 0 15px var(--color-error-glow);
}

.toast-message.success {
  border-color: var(--color-success);
  box-shadow: var(--shadow-premium), 0 0 15px var(--color-success-glow);
}

.toast-message.hide {
  opacity: 0;
}

/* Keyframes & Animations */
@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(12px) scale(0.97);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes popIn {
  0% { transform: scale(0.85); opacity: 0.5; }
  100% { transform: scale(1); opacity: 1; }
}

@keyframes modalScaleIn {
  from {
    opacity: 0;
    transform: scale(0.93) translateY(8px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

@keyframes pulse-border {
  from { border-color: rgba(148, 163, 184, 0.4); }
  to { border-color: var(--color-primary); }
}

.shake {
  animation: shakeKeyframe 0.4s ease-in-out;
}

@keyframes shakeKeyframe {
  0%, 100% { transform: translateX(0); }
  15%, 45%, 75% { transform: translateX(-6px); }
  30%, 60%, 90% { transform: translateX(6px); }
}

.victory-shake {
  animation: victoryCelebration 0.6s ease-in-out;
}

@keyframes victoryCelebration {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px) scale(1.02); }
}

/* Utility classes */
.hide {
  display: none !important;
}

/* Custom Scrollbar for leaderboard */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.1);
}
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.25);
}

/* Screen Size adjustments for short devices */
@media (max-height: 700px) {
  .logo { font-size: 1.3rem; }
  .header-info { padding: 4px 0; }
  .ladder-container { padding: 8px 0; }
  .ladder-rung { height: 42px; gap: 8px; }
  .rung-word { font-size: 1.15rem; letter-spacing: 2px; }
  .letter-box { width: 28px; height: 30px; font-size: 1.05rem; }
  .key { height: 40px; font-size: 0.95rem; }
  .large-key { max-width: 55px; }
}

/* Sibling columns layout on desktop */
.page-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  min-height: 100vh;
}

@media (min-width: 1024px) {
  .page-wrapper {
    flex-direction: row;
    justify-content: center;
    align-items: flex-start;
    max-width: 1200px;
    margin: 0 auto;
    gap: 32px;
    padding: 40px 20px;
    width: 100%;
  }
  
  .app-container {
    max-width: 480px;
    min-height: auto;
    height: auto;
    border: 1px solid var(--card-border);
    border-radius: 20px;
    background: rgba(30, 41, 59, 0.25);
    backdrop-filter: var(--card-blur);
    padding: 0 24px 24px;
    box-shadow: var(--shadow-premium);
  }
  
  .app-header {
    background: none;
    backdrop-filter: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    margin-bottom: 10px;
  }

  /* Modals turning into static side panels on desktop */
  .inline-panel {
    display: flex !important;
    position: sticky !important;
    top: 40px;
    width: 320px !important;
    height: auto !important;
    background: none !important;
    backdrop-filter: none !important;
    padding: 0 !important;
    z-index: 1 !important;
  }
  
  .inline-panel .modal-content {
    background: var(--card-bg) !important;
    border: 1px solid var(--card-border) !important;
    border-radius: 20px !important;
    max-width: 100% !important;
    width: 100% !important;
    height: auto !important;
    box-shadow: var(--shadow-premium) !important;
    animation: none !important;
  }

  /* Hide close and confirmation buttons since panels are permanent sidebars on desktop */
  .inline-panel .close-btn,
  .inline-panel .modal-btn {
    display: none !important;
  }

  /* Hide header icons for help and leaderboard since they are already open */
  #btn-help,
  #btn-leaderboard {
    display: none !important;
  }
}

/* Archive Modal content width */
.archive-modal-content {
  max-width: 500px !important;
}

/* Archive Modal tab styling */
.archive-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--card-border);
  padding-bottom: 10px;
}

.tab-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-family: inherit;
  font-weight: 700;
  font-size: 0.9rem;
  padding: 8px 16px;
  cursor: pointer;
  border-radius: 6px;
  transition: var(--transition-smooth);
}

.tab-btn:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.03);
}

.tab-btn.active {
  color: var(--color-primary);
  background: rgba(167, 139, 250, 0.1);
}

.tab-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.archive-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(56px, 1fr));
  gap: 10px;
  max-height: 380px;
  overflow-y: auto;
  padding-right: 4px;
  padding-bottom: 10px;
}

.archive-card {
  aspect-ratio: 1;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--card-border);
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  color: var(--text-main);
  transition: var(--transition-smooth);
  position: relative;
}

.archive-card:hover {
  background: rgba(167, 139, 250, 0.1);
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--color-primary-glow);
}

.archive-card.completed {
  border-color: var(--color-success);
  color: var(--color-success);
  background: rgba(52, 211, 153, 0.05);
}

.archive-card .min-steps-indicator {
  font-size: 0.6rem;
  font-weight: 400;
  color: var(--text-muted);
  margin-top: 1px;
}

.archive-card.completed .min-steps-indicator {
  color: var(--color-success);
  opacity: 0.8;
}

.archive-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 380px;
  overflow-y: auto;
  padding-right: 4px;
  padding-bottom: 10px;
}

.archive-list-item {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 12px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.archive-list-item:hover {
  background: rgba(34, 211, 238, 0.08);
  border-color: var(--color-secondary);
  transform: translateX(4px);
}

.archive-list-item.completed {
  border-left: 3px solid var(--color-success);
}

.archive-item-info {
  display: flex;
  flex-direction: column;
  gap: 3px;
  text-align: left;
}

.archive-item-date {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.archive-item-challenge {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 6px;
}

.archive-item-challenge i {
  font-size: 0.7rem;
  color: var(--text-muted);
}

.archive-item-steps {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.archive-item-steps strong {
  color: var(--text-main);
}

.archive-item-action {
  font-size: 1.1rem;
  color: var(--text-muted);
  transition: var(--transition-smooth);
}

.archive-list-item:hover .archive-item-action {
  color: var(--color-secondary);
}

.archive-list-item.completed .archive-item-action {
  color: var(--color-success);
}

/* Mobile: reposition header icons along top-left and top-right edges */
@media (max-width: 768px) {
  .app-header { height: 56px; }

  /* Make the four main header icons fixed and larger for easy touch */
  #btn-help, #btn-archive, #btn-stats, #btn-leaderboard {
    position: fixed;
    width: 52px;
    height: 52px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255,255,255,0.03);
    color: var(--text-main);
    z-index: 1100;
    box-shadow: 0 8px 20px rgba(0,0,0,0.45);
    transition: transform 0.12s ease, background 0.12s ease;
    backdrop-filter: blur(6px);
  }

  /* Left column (help, archive) */
  #btn-help { left: 12px; top: 8vh; }
  #btn-archive { left: 12px; top: calc(8vh + 68px); }

  /* Right column (stats, leaderboard) */
  #btn-stats { right: 12px; top: 8vh; }
  #btn-leaderboard { right: 12px; top: calc(8vh + 68px); }

  /* Slightly larger icons */
  #btn-help i, #btn-archive i, #btn-stats i, #btn-leaderboard i {
    font-size: 1.25rem;
  }

  /* Ensure the centered logo has breathing room and doesn't overlap */
  .header-center { padding-top: 6px; }
  .app-container { padding-top: 12px; }

  /* Reduce header-left/right inline visibility so fixed buttons are used */
  .app-header .header-left, .app-header .header-right {
    min-width: 48px;
  }

  /* Prevent the header icons in the header flow from showing as duplicates */
  .app-header .icon-btn { background: transparent; }
}