/* ==========================================================================
   KeySmash - Complete Modern Design System & Fixed Screen Layout
   ========================================================================== */

/* --- Custom CSS Properties & Themes --- */
:root {
  /* Fonts */
  --font-heading: 'Fredoka', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-body: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  /* Default Theme (Dark Galaxy) */
  --bg-gradient-start: #0b0f19;
  --bg-gradient-end: #111827;
  --text-color: #f8fafc;
  --text-muted: #94a3b8;
  --card-bg: rgba(17, 24, 39, 0.88);
  --card-border: rgba(255, 255, 255, 0.15);
  --primary-color: #FF5757;
  --primary-hover: #ff3333;
  --accent-color: #38BDF8;
  --shadow-color: rgba(0, 0, 0, 0.4);

  /* Key Display Defaults */
  --key-color: #ffffff;
  --key-glow: rgba(56, 189, 248, 0.5);

  /* Transitions */
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.5s cubic-bezier(0.68, -0.6, 0.32, 1.6);
}

/* Theme: Océano Profundo & Peces 🌊 */
body.theme-ocean {
  --bg-gradient-start: #00122e;
  --bg-gradient-end: #003566;
  --text-color: #f0f9ff;
  --text-muted: #7dd3fc;
  --card-bg: rgba(7, 30, 58, 0.9);
  --card-border: rgba(56, 189, 248, 0.3);
  --primary-color: #38bdf8;
  --primary-hover: #0284c7;
  --accent-color: #06b6d4;
  --shadow-color: rgba(0, 18, 46, 0.6);
  --key-color: #e0f2fe;
  --key-glow: rgba(56, 189, 248, 0.7);
}

/* Theme: Rosado & Flores 🌸 */
body.theme-pastel {
  --bg-gradient-start: #fff0f5;
  --bg-gradient-end: #fbcfe8;
  --text-color: #831843;
  --text-muted: #9d174d;
  --card-bg: rgba(255, 255, 255, 0.92);
  --card-border: rgba(244, 114, 182, 0.4);
  --primary-color: #f43f5e;
  --primary-hover: #e11d48;
  --accent-color: #ec4899;
  --shadow-color: rgba(244, 63, 94, 0.15);
  --key-color: #831843;
  --key-glow: rgba(244, 63, 94, 0.3);
}

/* Theme: Gamer Techno & Rayos Láser 🎮⚡ */
body.theme-vibrant {
  --bg-gradient-start: #0f051d;
  --bg-gradient-end: #2b0938;
  --text-color: #f4f4f5;
  --text-muted: #c084fc;
  --card-bg: rgba(23, 10, 41, 0.92);
  --card-border: rgba(217, 70, 239, 0.4);
  --primary-color: #00ff66;
  --primary-hover: #00cc52;
  --accent-color: #d946ef;
  --shadow-color: rgba(0, 255, 102, 0.3);
  --key-color: #00ff66;
  --key-glow: rgba(0, 255, 102, 0.7);
}

/* Theme: Dark / Galaxia Oscura 🌌 */
body.theme-dark {
  --bg-gradient-start: #0b0f19;
  --bg-gradient-end: #111827;
  --text-color: #f8fafc;
  --text-muted: #94a3b8;
  --card-bg: rgba(30, 41, 59, 0.88);
  --card-border: rgba(255, 255, 255, 0.15);
  --primary-color: #FF5757;
  --accent-color: #38BDF8;
  --shadow-color: rgba(0, 0, 0, 0.4);
  --key-color: #ffffff;
}

/* --- Global Reset & Lock Scroll --- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
}

html, body {
  width: 100vw;
  height: 100vh;
  margin: 0;
  padding: 0;
  overflow: hidden;
  font-family: var(--font-body);
  background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
  color: var(--text-color);
  transition: background 0.5s ease;
  touch-action: manipulation;
}

/* --- Fixed Background Canvas Layer --- */
#canvas-layer {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  z-index: 1;
  pointer-events: none;
  display: block;
}

/* --- Top Bar & Language Switcher --- */
#top-bar {
  position: fixed;
  top: 1.5rem;
  left: 1.5rem;
  z-index: 110;
}

.lang-switch-container {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  padding: 0.3rem;
  border-radius: 1.5rem;
  backdrop-filter: blur(12px);
  box-shadow: 0 4px 16px var(--shadow-color);
}

.btn-lang {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 700;
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 0.35rem 0.75rem;
  border-radius: 1rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-lang.active {
  background: var(--accent-color);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

/* --- Settings Trigger Wrapper & Guide Tooltip Pointer --- */
#settings-trigger-wrapper {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  z-index: 110;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.gear-tooltip {
  background: var(--card-bg);
  border: 2px solid var(--primary-color);
  padding: 0.45rem 1rem;
  border-radius: 1.2rem;
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-color);
  box-shadow: 0 6px 20px rgba(255, 87, 87, 0.3);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  backdrop-filter: blur(12px);
  animation: bouncePointer 2s ease-in-out infinite;
  pointer-events: none;
}

.tooltip-arrow {
  font-size: 1.1rem;
  color: var(--primary-color);
  font-weight: 900;
  animation: pulseArrow 1.2s ease-in-out infinite alternate;
}

/* --- Centered Main Stage --- */
#main-stage {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

#key-display-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  pointer-events: auto;
}

#key-badge {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  background: var(--card-bg);
  padding: 0.4rem 1.2rem;
  border-radius: 2rem;
  box-shadow: 0 4px 12px var(--shadow-color);
  margin-bottom: 1rem;
  border: 1px solid var(--card-border);
  transition: opacity 0.3s ease;
}

#key-badge.hidden {
  opacity: 0;
  visibility: hidden;
}

#key-character {
  font-family: var(--font-heading);
  font-size: clamp(7rem, 24vw, 17rem);
  font-weight: 700;
  color: var(--key-color);
  line-height: 1;
  text-shadow: 0 15px 35px var(--key-glow), 0 5px 10px rgba(0,0,0,0.15);
  transition: color 0.2s ease, text-shadow 0.2s ease;
  will-change: transform;
}

.key-bounce {
  animation: popKey 0.45s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

#key-name {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 4.5vw, 2.8rem);
  font-weight: 600;
  color: var(--text-muted);
  margin-top: 1rem;
  min-height: 3.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* --- Start Overlay Card --- */
#start-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

#start-overlay.overlay-active {
  opacity: 1;
  pointer-events: auto;
}

.start-card {
  background: var(--card-bg);
  border: 2px solid var(--card-border);
  padding: 2.5rem 2rem;
  border-radius: 2rem;
  text-align: center;
  max-width: 480px;
  width: 90%;
  box-shadow: 0 20px 40px var(--shadow-color);
  animation: cardPopIn 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.start-icon {
  font-size: 4rem;
  margin-bottom: 0.5rem;
  animation: floatEmoji 3s ease-in-out infinite;
}

.start-card h1 {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
}

.start-card p {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 1.8rem;
  line-height: 1.5;
}

.start-tip {
  margin-top: 1.5rem;
  font-size: 0.9rem;
  color: var(--text-muted);
  background: rgba(0, 0, 0, 0.04);
  padding: 0.75rem 1rem;
  border-radius: 1rem;
}

/* --- Primary Button --- */
.btn-primary {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  color: #ffffff;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  border: none;
  padding: 1rem 2rem;
  border-radius: 1.5rem;
  cursor: pointer;
  box-shadow: 0 8px 20px var(--shadow-color);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  width: 100%;
}

.btn-primary:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 12px 25px var(--shadow-color);
}

.btn-secondary {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  padding: 0.75rem 1.25rem;
  border-radius: 1rem;
  border: 2px solid rgba(0,0,0,0.1);
  background: rgba(255, 255, 255, 0.7);
  color: var(--text-color);
  cursor: pointer;
  transition: all var(--transition-fast);
  width: 100%;
  text-align: center;
}

body.theme-dark .btn-secondary, body.theme-ocean .btn-secondary, body.theme-vibrant .btn-secondary {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.15);
  color: #ffffff;
}

.btn-secondary:hover {
  background: var(--accent-color);
  color: #ffffff;
  border-color: var(--accent-color);
}

.btn-email-contact {
  display: block;
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 600;
  text-align: center;
  color: var(--accent-color);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid var(--card-border);
  padding: 0.8rem 1rem;
  border-radius: 1rem;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.btn-email-contact:hover {
  background: rgba(56, 189, 248, 0.2);
  transform: translateY(-1px);
}

/* --- ESC Hold Radial Progress Overlay --- */
.esc-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 1;
  transition: opacity 0.2s ease;
}

.esc-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.esc-card {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.progress-ring__circle {
  transition: stroke-dashoffset 0.1s linear;
  transform: rotate(-90deg);
  transform-origin: 50% 50%;
}

.esc-card-content {
  position: absolute;
  display: flex;
  flex-direction: column;
  align-items: center;
  color: #ffffff;
}

.esc-icon {
  font-size: 2.2rem;
  margin-bottom: 0.2rem;
}

.esc-text {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
}

/* --- KeySmash Report Modal --- */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 250;
  background: rgba(10, 15, 29, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  opacity: 1;
  transition: opacity 0.3s ease;
}

.modal-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.report-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 1.8rem;
  padding: 2.2rem 2rem;
  width: 440px;
  max-width: 92vw;
  box-shadow: 0 25px 50px var(--shadow-color);
  color: var(--text-color);
  text-align: center;
  animation: cardPopIn 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.report-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  margin-bottom: 1.5rem;
}

.report-icon {
  font-size: 2rem;
}

.report-header h2 {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  color: var(--text-color);
  letter-spacing: 0.5px;
}

.report-stats-box {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--card-border);
  border-radius: 1.2rem;
  padding: 1.2rem 1.4rem;
  margin-bottom: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.stat-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 1rem;
}

.stat-label {
  color: var(--text-muted);
}

.stat-value {
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--text-color);
}

.stat-value strong {
  font-size: 1.3rem;
  color: var(--accent-color);
}

.chaos-badge {
  color: var(--primary-color);
  font-weight: 700;
}

.report-rating {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-color);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.report-actions {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-bottom: 1.5rem;
}

.btn-gradient-share {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: #ffffff;
  background: linear-gradient(135deg, var(--accent-color), var(--primary-color));
  border: none;
  padding: 0.95rem 1.2rem;
  border-radius: 1.2rem;
  cursor: pointer;
  box-shadow: 0 8px 20px var(--shadow-color);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  width: 100%;
}

.btn-gradient-share:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 25px var(--shadow-color);
}

.btn-dark-action {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-color);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--card-border);
  padding: 0.85rem 1.2rem;
  border-radius: 1.2rem;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
  width: 100%;
}

.btn-dark-action:hover {
  background: rgba(255, 255, 255, 0.15);
}

.btn-dark-outline {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid var(--card-border);
  padding: 0.8rem 1.2rem;
  border-radius: 1.2rem;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
  width: 100%;
}

.btn-dark-outline:hover {
  color: var(--text-color);
}

.report-footer {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 600;
  letter-spacing: 1px;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.contact-email-link {
  color: var(--accent-color);
  text-decoration: none;
}

.contact-email-link:hover {
  text-decoration: underline;
}

/* --- Discreet Settings Toggle Button --- */
#btn-settings-toggle, .btn-icon {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--card-bg);
  border: 2px solid var(--card-border);
  color: var(--text-color);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 8px 24px var(--shadow-color);
  transition: transform var(--transition-fast), background var(--transition-fast);
}

#btn-settings-toggle:hover, .btn-icon:hover {
  transform: scale(1.1) rotate(30deg);
  background: var(--accent-color);
  color: #ffffff;
}

/* --- Settings Drawer --- */
.drawer {
  position: fixed;
  top: 0;
  right: 0;
  width: 400px;
  max-width: 90vw;
  height: 100vh;
  z-index: 150;
  background: var(--card-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-left: 2px solid var(--card-border);
  box-shadow: -10px 0 40px var(--shadow-color);
  display: flex;
  flex-direction: column;
  transform: translateX(0);
  transition: transform var(--transition-normal);
}

.drawer.hidden {
  transform: translateX(105%);
}

.drawer-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--card-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.drawer-header h2 {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  color: var(--text-color);
}

.btn-icon-close {
  background: none;
  border: none;
  font-size: 2rem;
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1;
  padding: 0 0.5rem;
  transition: color var(--transition-fast);
}

.btn-icon-close:hover {
  color: var(--primary-color);
}

.drawer-body {
  padding: 1.5rem;
  overflow-y: auto;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1.8rem;
}

/* Setting Groups & Selector Grids */
.setting-group h3 {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  color: var(--text-color);
  margin-bottom: 0.8rem;
}

.setting-header-inline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.8rem;
}

.setting-header-inline h3 {
  margin-bottom: 0;
}

.btn-toggle-small {
  background: rgba(0,0,0,0.05);
  border: 1px solid var(--card-border);
  border-radius: 0.75rem;
  padding: 0.3rem 0.6rem;
  font-size: 1.1rem;
  cursor: pointer;
  transition: transform 0.15s ease;
}

.btn-toggle-small:hover {
  transform: scale(1.1);
}

.option-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.btn-option {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.85rem 0.5rem;
  border-radius: 1rem;
  border: 2px solid var(--card-border);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-color);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.option-emoji {
  font-size: 1.6rem;
}

.btn-option:hover {
  transform: translateY(-2px);
  border-color: var(--accent-color);
}

.btn-option.active {
  background: var(--accent-color);
  color: #ffffff;
  border-color: var(--accent-color);
  box-shadow: 0 4px 12px var(--shadow-color);
}

/* Range Slider */
.range-container {
  display: flex;
  align-items: center;
  gap: 1rem;
}

input[type="range"] {
  flex: 1;
  height: 8px;
  border-radius: 4px;
  background: rgba(0,0,0,0.1);
  outline: none;
  accent-color: var(--primary-color);
  cursor: pointer;
}

#volume-value-text {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.95rem;
  min-width: 45px;
  color: var(--text-muted);
}

.action-buttons {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.info-box {
  background: rgba(0, 0, 0, 0.03);
  border-radius: 1rem;
  padding: 1rem;
  border: 1px solid var(--card-border);
}

.info-box h4 {
  font-family: var(--font-heading);
  margin-bottom: 0.4rem;
}

.info-box p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.4;
  margin-bottom: 0.4rem;
}

.info-box .repo-link {
  font-weight: 600;
  color: var(--accent-color);
}

/* Donation & Ko-fi Section */
.donation-group {
  text-align: center;
  background: rgba(255, 255, 255, 0.04);
  border-radius: 1rem;
  padding: 1rem;
  border: 1px solid var(--card-border);
}

.donation-group h3 {
  font-family: var(--font-heading);
  font-size: 1rem;
  margin-bottom: 0.3rem;
}

.donation-group p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  line-height: 1.4;
}

.kofi-wrapper, .report-donation {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 0.5rem;
  margin-bottom: 0.5rem;
}

.kofi-wrapper a, .report-donation a {
  display: inline-flex;
  transition: transform var(--transition-fast), filter var(--transition-fast);
}

.kofi-wrapper a:hover, .report-donation a:hover {
  transform: scale(1.06);
  filter: drop-shadow(0 4px 12px rgba(255, 95, 95, 0.4));
}

/* Animations */
@keyframes bouncePointer {
  0%, 100% { transform: translateX(0); }
  50% { transform: translateX(-8px); }
}

@keyframes pulseArrow {
  0% { transform: translateX(0); }
  100% { transform: translateX(4px); }
}

@keyframes popKey {
  0% {
    transform: scale(0.3) rotate(-10deg);
    opacity: 0.3;
  }
  50% {
    transform: scale(1.2) rotate(4deg);
    opacity: 1;
  }
  100% {
    transform: scale(1) rotate(0deg);
  }
}

@keyframes cardPopIn {
  from {
    opacity: 0;
    transform: scale(0.85) translateY(20px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

@keyframes floatEmoji {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-8px) rotate(5deg); }
}

/* ==========================================================================
   Virtual Touch Keyboard & Mobile / Tablet Design System
   ========================================================================== */

/* Floating Toggle Button for Virtual Keyboard */
.btn-vkey-toggle {
  position: fixed;
  bottom: 1.2rem;
  right: 1.2rem;
  z-index: 105;
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 700;
  color: #ffffff;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  border: 2px solid rgba(255, 255, 255, 0.3);
  padding: 0.65rem 1.2rem;
  border-radius: 2rem;
  box-shadow: 0 8px 24px var(--shadow-color), 0 0 16px rgba(255, 87, 87, 0.4);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  backdrop-filter: blur(12px);
  transition: transform var(--transition-bounce), box-shadow var(--transition-fast);
  touch-action: manipulation;
}

.btn-vkey-toggle:hover {
  transform: translateY(-3px) scale(1.05);
}

.btn-vkey-toggle:active {
  transform: translateY(1px) scale(0.96);
}

/* Virtual Keyboard Container */
.vkey-container {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) translateY(0);
  width: 100vw;
  max-width: 960px;
  background: var(--card-bg);
  border-top-left-radius: 1.8rem;
  border-top-right-radius: 1.8rem;
  border: 1px solid var(--card-border);
  border-bottom: none;
  box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(20px);
  z-index: 104;
  padding: 0.8rem 1rem 1.2rem 1rem;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
  pointer-events: auto;
  user-select: none;
  -webkit-user-select: none;
  touch-action: none;
}

.vkey-container.hidden {
  transform: translateX(-50%) translateY(120%);
  opacity: 0;
  pointer-events: none;
}

/* Keyboard Header & Mode Tabs */
.vkey-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.vkey-tabs {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  overflow-x: auto;
  scrollbar-width: none;
}

.vkey-tabs::-webkit-scrollbar {
  display: none;
}

.vkey-tab {
  font-family: var(--font-heading);
  font-size: 0.82rem;
  font-weight: 700;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-muted);
  border: 1px solid transparent;
  padding: 0.4rem 0.8rem;
  border-radius: 1rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  touch-action: manipulation;
}

.vkey-tab.active {
  background: var(--accent-color);
  color: #ffffff;
  box-shadow: 0 2px 10px rgba(56, 189, 248, 0.4);
}

.vkey-btn-close {
  background: rgba(255, 255, 255, 0.1);
  border: none;
  color: var(--text-muted);
  font-size: 1.4rem;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  touch-action: manipulation;
}

.vkey-btn-close:hover {
  background: var(--primary-color);
  color: #ffffff;
}

/* Key Grid Layout */
.vkey-grid {
  display: grid;
  gap: 0.45rem;
  max-height: 42vh;
  overflow-y: auto;
  padding: 0.2rem;
  touch-action: manipulation;
}

/* Mode-specific Grid Templates */
.vkey-mode-abc {
  grid-template-columns: repeat(10, 1fr);
}

.vkey-mode-123 {
  grid-template-columns: repeat(5, 1fr);
}

.vkey-mode-piano {
  grid-template-columns: repeat(7, 1fr);
}

.vkey-mode-animals {
  grid-template-columns: repeat(5, 1fr);
}

/* Interactive Touch Key Buttons */
.vkey-btn {
  font-family: var(--font-heading);
  font-size: clamp(1.1rem, 4vw, 1.8rem);
  font-weight: 700;
  min-height: 52px;
  border-radius: 0.85rem;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.15) 0%, rgba(255, 255, 255, 0.05) 100%);
  color: var(--text-color);
  box-shadow: 0 4px 0 rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.4);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: transform 0.08s ease, background 0.15s ease, box-shadow 0.08s ease;
  touch-action: manipulation;
}

.vkey-btn .key-note-label {
  font-size: 0.65rem;
  opacity: 0.75;
  margin-top: 2px;
  font-family: var(--font-body);
}

.vkey-btn:hover {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.25) 0%, rgba(255, 255, 255, 0.1) 100%);
}

.vkey-btn:active,
.vkey-btn.active-touch {
  transform: translateY(3px) scale(0.95);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.3), inset 0 2px 4px rgba(0, 0, 0, 0.4);
  background: var(--primary-color) !important;
  color: #ffffff !important;
  border-color: rgba(255, 255, 255, 0.6);
}

/* Key Color Variations for Toddler Visual Stimulation */
.vkey-btn[data-color="red"] { background: linear-gradient(180deg, #ff6b6b 0%, #ee5253 100%); color: #fff; }
.vkey-btn[data-color="blue"] { background: linear-gradient(180deg, #48dbfb 0%, #0abde3 100%); color: #fff; }
.vkey-btn[data-color="green"] { background: linear-gradient(180deg, #1dd1a1 0%, #10ac84 100%); color: #fff; }
.vkey-btn[data-color="yellow"] { background: linear-gradient(180deg, #feca57 0%, #ff9f43 100%); color: #2d3436; }
.vkey-btn[data-color="purple"] { background: linear-gradient(180deg, #5f27cd 0%, #341f97 100%); color: #fff; }
.vkey-btn[data-color="pink"] { background: linear-gradient(180deg, #ff9ff3 0%, #f368e0 100%); color: #fff; }
.vkey-btn[data-color="orange"] { background: linear-gradient(180deg, #ff9f43 0%, #ee5253 100%); color: #fff; }

/* Responsive Adjustments & Mobile Touch UX Polish */
@media (max-width: 768px) {
  #top-bar {
    top: 0.8rem;
    left: 0.8rem;
  }
  
  #settings-trigger-wrapper {
    top: 0.8rem;
    right: 0.8rem;
  }
  
  .gear-tooltip {
    display: none;
  }

  #main-stage {
    padding-bottom: 0;
  }

  #key-character {
    font-size: clamp(5rem, 28vw, 12rem);
  }

  #key-name {
    font-size: clamp(1.3rem, 6vw, 2.5rem);
  }

  .drawer {
    width: 100vw;
    max-width: 100vw;
  }

  .report-card {
    padding: 1.2rem;
    max-width: 92vw;
  }
}

/* Landscape Mode for Smartphones & Tablets */
@media (max-height: 520px) and (orientation: landscape) {
  #top-bar, #settings-trigger-wrapper {
    top: 0.5rem;
  }

  #main-stage {
    padding-bottom: 0;
  }

  #key-character {
    font-size: clamp(4rem, 22vh, 8rem);
  }
}