/* ==========================================================================
   NEON TETRIS - CSS STYLESHEET
   Aesthetics: Sleek Glassmorphism, Synthwave Neon, Premium Animations
   ========================================================================== */

/* --- Custom Variables & Reset --- */
:root {
  --bg-color: #06050c;
  --bg-gradient: radial-gradient(circle at center, #0e0a22 0%, #05040a 100%);
  --panel-bg: rgba(18, 14, 36, 0.5);
  --panel-border: rgba(255, 255, 255, 0.08);
  --panel-glow: rgba(0, 242, 254, 0.15);
  
  /* Neon Palette */
  --cyan: #00f2fe;
  --magenta: #ff007f;
  --purple: #9d4edd;
  --blue: #4361ee;
  --yellow: #f72585;
  --orange: #ff7096;
  --green: #4cc9f0;
  
  --text-primary: #ffffff;
  --text-secondary: #a5a2c2;
  --text-muted: #64617a;
  
  /* Fonts */
  --font-logo: 'Orbitron', sans-serif;
  --font-hud: 'Orbitron', sans-serif;
  --font-ui: 'Rajdhani', sans-serif;
}

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

html {
  overscroll-behavior: none;
}

body {
  background-color: var(--bg-color);
  background-image: var(--bg-gradient);
  color: var(--text-primary);
  font-family: var(--font-ui);
  min-height: 100vh;
  overflow-x: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  overscroll-behavior: none;
}

/* --- Floating Glow Orbs (Background Art) --- */
.glow-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(130px);
  z-index: 0;
  pointer-events: none;
  opacity: 0.45;
}

.orb-1 {
  width: 400px;
  height: 400px;
  background: var(--purple);
  top: 10%;
  left: 5%;
  animation: floatOrb 18s ease-in-out infinite alternate;
}

.orb-2 {
  width: 500px;
  height: 500px;
  background: var(--blue);
  bottom: 10%;
  right: 5%;
  animation: floatOrb 22s ease-in-out infinite alternate-reverse;
}

@keyframes floatOrb {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(50px, 40px) scale(1.1); }
  100% { transform: translate(-30px, 80px) scale(0.95); }
}

/* --- Layout Structure --- */
.app-container {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  justify-content: space-between;
}

.game-header {
  text-align: center;
  margin-bottom: 25px;
}

.logo-text {
  font-family: var(--font-logo);
  font-size: 3rem;
  font-weight: 900;
  letter-spacing: 6px;
  text-shadow: 0 0 10px rgba(0, 242, 254, 0.6), 0 0 20px rgba(0, 242, 254, 0.2);
  color: #fff;
  margin-bottom: 4px;
}

.logo-text .accent-text {
  color: var(--magenta);
  text-shadow: 0 0 10px rgba(255, 0, 127, 0.6), 0 0 20px rgba(255, 0, 127, 0.2);
}

.tagline {
  font-family: var(--font-ui);
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 4px;
  color: var(--text-secondary);
}

/* --- Main Layout Grid --- */
.game-layout {
  display: grid;
  grid-template-columns: 240px 1fr 240px;
  gap: 20px;
  align-items: start;
}

/* --- Panels (Glassmorphism) --- */
.glass-panel {
  background: var(--panel-bg);
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.4), 
              inset 0 0 0 1px rgba(255, 255, 255, 0.05);
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.glass-panel:hover {
  border-color: rgba(255, 255, 255, 0.15);
  box-shadow: 0 12px 40px 0 rgba(0, 0, 0, 0.5),
              0 0 15px var(--panel-glow);
}

.panel {
  padding: 20px;
  margin-bottom: 20px;
}

.panel-title {
  font-family: var(--font-logo);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-align: center;
  color: var(--text-secondary);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding-bottom: 10px;
  margin-bottom: 15px;
}

/* --- Left & Right Sidebars --- */
.sidebar {
  display: flex;
  flex-direction: column;
}

.preview-container {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 10px 0;
}

.preview-container canvas {
  background: rgba(0, 0, 0, 0.2);
  border-radius: 8px;
}

/* Controls Guide (Left Sidebar) */
.controls-guide {
  font-size: 0.95rem;
}

.control-row {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}

.control-row:last-child {
  border-bottom: none;
}

.control-row span:first-child {
  color: var(--cyan);
  font-family: var(--font-logo);
  font-weight: 700;
  font-size: 0.85rem;
}

.control-row span:last-child {
  color: var(--text-secondary);
}

/* Stats (Right Sidebar) */
.stats-panel {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.stat-box {
  background: rgba(0, 0, 0, 0.25);
  padding: 12px;
  border-radius: 10px;
  border-left: 3px solid var(--purple);
  transition: transform 0.2s;
}

.stat-box:hover {
  transform: translateX(4px);
}

.stats-panel .stat-box:nth-child(1) { border-left-color: var(--cyan); }
.stats-panel .stat-box:nth-child(2) { border-left-color: var(--purple); }
.stats-panel .stat-box:nth-child(3) { border-left-color: var(--magenta); }

.stat-label {
  font-family: var(--font-ui);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 1px;
}

.stat-value {
  font-family: var(--font-hud);
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--text-primary);
  margin-top: 4px;
}

/* Leaderboard */
.leaderboard-panel {
  min-height: 195px;
}

.leaderboard-list {
  list-style: none;
}

.leaderboard-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 10px;
  margin-bottom: 6px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid transparent;
  font-size: 0.95rem;
  transition: all 0.2s;
}

.leaderboard-item:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.05);
}

.leaderboard-item.rank-1 {
  background: rgba(0, 242, 254, 0.08);
  border-color: rgba(0, 242, 254, 0.15);
}
.leaderboard-item.rank-1 .rank-num { color: var(--cyan); font-weight: 800; }

.leaderboard-item.rank-2 {
  background: rgba(157, 78, 221, 0.08);
  border-color: rgba(157, 78, 221, 0.15);
}
.leaderboard-item.rank-2 .rank-num { color: var(--purple); }

.leaderboard-item .player-name {
  font-family: var(--font-logo);
  font-weight: 600;
  margin-left: 8px;
  flex-grow: 1;
}

.leaderboard-item .player-score {
  font-family: var(--font-hud);
  font-weight: 700;
  color: var(--text-primary);
}

/* --- Center Board Area --- */
.board-area {
  display: flex;
  justify-content: center;
}

.board-wrapper {
  padding: 15px;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  background: rgba(10, 8, 22, 0.65);
}

.hud-top-bar {
  width: 100%;
  display: flex;
  justify-content: space-between;
  margin-bottom: 12px;
  z-index: 10;
}

/* Icon Buttons */
.icon-btn {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  justify-content: center;
  align-items: center;
  color: var(--text-secondary);
  cursor: pointer;
  outline: none;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.icon-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 10px rgba(0, 242, 254, 0.3);
  transform: scale(1.05);
}

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

.icon-btn.muted {
  color: var(--text-muted);
}

/* Canvas Box & Overlays */
.canvas-container {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  border: 2px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.6);
  background: #000;
  width: 300px;
  height: 600px;
}

#game-canvas {
  display: block;
}

/* Overlays */
.board-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(6, 5, 12, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 20;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.30s ease;
}

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

.overlay-content {
  text-align: center;
  padding: 30px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 15px;
  width: 90%;
}

.neon-glow-text {
  font-family: var(--font-logo);
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--cyan);
  letter-spacing: 2px;
  text-shadow: 0 0 15px rgba(0, 242, 254, 0.6);
  margin-bottom: 5px;
}

.neon-glow-text.text-danger {
  color: var(--magenta);
  text-shadow: 0 0 15px rgba(255, 0, 127, 0.6);
}

.overlay-content p {
  color: var(--text-secondary);
  font-size: 1rem;
  letter-spacing: 1px;
}

.final-score-lbl {
  font-family: var(--font-ui);
  font-size: 1.2rem;
  font-weight: 700;
}

.final-score-lbl span {
  font-family: var(--font-hud);
  color: var(--cyan);
  font-size: 1.5rem;
}

/* Buttons styling */
.btn {
  font-family: var(--font-logo);
  font-weight: 700;
  font-size: 1rem;
  padding: 12px 28px;
  border: none;
  border-radius: 30px;
  cursor: pointer;
  letter-spacing: 2px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  outline: none;
  box-shadow: 0 4px 15px rgba(0,0,0,0.4);
}

.btn-primary {
  background: linear-gradient(135deg, var(--cyan) 0%, var(--blue) 100%);
  color: #000;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 242, 254, 0.4);
}

.btn-primary:active {
  transform: translateY(1px);
}

.btn-accent {
  background: linear-gradient(135deg, var(--magenta) 0%, var(--purple) 100%);
  color: #fff;
}

.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255, 0, 127, 0.4);
}

/* Score submit area */
.score-submit-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  width: 100%;
  margin: 10px 0;
  padding: 15px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.high-score-congrats {
  font-family: var(--font-logo);
  color: var(--magenta);
  font-weight: 800;
  animation: pulseNeon 1s ease-in-out infinite;
}

@keyframes pulseNeon {
  0%, 100% { text-shadow: 0 0 5px rgba(255, 0, 127, 0.5); }
  50% { text-shadow: 0 0 15px rgba(255, 0, 127, 0.8), 0 0 25px rgba(255, 0, 127, 0.3); }
}

#input-player-name {
  width: 100%;
  max-width: 150px;
  background: rgba(0, 0, 0, 0.6);
  border: 2px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  padding: 10px;
  text-align: center;
  color: #fff;
  font-family: var(--font-logo);
  font-size: 1.2rem;
  letter-spacing: 4px;
  outline: none;
  transition: all 0.2s;
}

#input-player-name:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 10px rgba(0, 242, 254, 0.3);
}

.hidden {
  display: none !important;
}

/* --- Mobile Touch Controls --- */
.mobile-controls {
  display: none; /* Hidden on desktop by default */
  flex-direction: column;
  gap: 12px;
  max-width: 450px;
  width: 100%;
  margin: 20px auto 0 auto;
  user-select: none;
  -webkit-user-select: none;
}

.controls-row-top,
.controls-row-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 15px;
}

.control-btn {
  background: rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
  font-family: var(--font-ui);
  font-weight: 700;
  cursor: pointer;
  transition: all 0.1s;
  outline: none;
  display: flex;
  align-items: center;
  justify-content: center;
}

.control-btn:active {
  background: rgba(0, 242, 254, 0.15);
  border-color: var(--cyan);
  transform: scale(0.92);
}

.touch-btn-circle {
  width: 55px;
  height: 55px;
  border-radius: 50%;
  font-size: 1rem;
}

.dpad {
  display: flex;
  gap: 8px;
}

.dpad-btn {
  width: 55px;
  height: 55px;
  border-radius: 12px;
  font-size: 1.3rem;
}

.hard-drop-btn {
  flex-grow: 1;
  height: 55px;
  border-radius: 12px;
  font-family: var(--font-logo);
  font-size: 0.9rem;
  letter-spacing: 1px;
  background: linear-gradient(135deg, rgba(67, 97, 238, 0.2) 0%, rgba(157, 78, 221, 0.2) 100%);
  border-color: rgba(67, 97, 238, 0.3);
}

.hard-drop-btn:active {
  background: linear-gradient(135deg, rgba(67, 97, 238, 0.4) 0%, rgba(157, 78, 221, 0.4) 100%);
}

/* --- Footer --- */
.game-footer {
  text-align: center;
  margin-top: 30px;
  padding: 15px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.03);
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* --- Responsive Media Queries --- */

/* Tablet Layout (Stacked Sidebars) */
@media (max-width: 900px) and (min-width: 551px) {
  .game-layout {
    grid-template-columns: 1fr;
    max-width: 520px;
    margin: 0 auto;
    gap: 15px;
  }
  
  .sidebar-left { order: 2; }
  .board-area { order: 1; }
  .sidebar-right { order: 3; }
  .desktop-controls-panel { display: none; }
  .sidebar {
    flex-direction: row;
    gap: 15px;
  }
  .sidebar .panel {
    flex: 1;
    margin-bottom: 0;
  }
}

/* Mobile & Touch Layout (Zero-Scroll & Split Gamepad) */
@media (max-width: 550px) {
  /* Prevent scroll entirely on mobile viewport */
  html, body {
    overflow: hidden;
    position: fixed;
    width: 100vw;
    height: 100vh;
    height: 100dvh;
  }

  .app-container {
    padding: 8px 12px;
    height: 100vh;
    height: 100dvh;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    overflow: hidden;
  }

  .game-header {
    margin-bottom: 4px;
    flex-shrink: 0;
  }

  .logo-text {
    font-size: 1.6rem;
    letter-spacing: 3px;
    margin-bottom: 0;
  }

  .tagline {
    display: none; /* hide tagline to save space */
  }

  .game-layout {
    display: grid;
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr auto; /* HUD row, Board row, Controls row */
    gap: 6px;
    flex-grow: 1;
    overflow: hidden;
    width: 100%;
    align-items: center;
  }

  /* Row 1: Left HUD Panel (Hold) and Right HUD Panel (Next/Stats) aligned side by side */
  .sidebar-left {
    grid-row: 1;
    grid-column: 1;
    justify-self: start;
    z-index: 10;
    flex-direction: row;
  }
  
  .sidebar-right {
    grid-row: 1;
    grid-column: 1;
    justify-self: end;
    z-index: 10;
    display: flex;
    flex-direction: row-reverse; /* Next box on right, Stats to its left */
    align-items: center;
    gap: 6px;
  }

  /* Hide elements that break mobile space bounds */
  .desktop-controls-panel,
  .leaderboard-panel {
    display: none !important;
  }

  /* Compact Previews & Panels */
  .sidebar .panel {
    padding: 6px 8px;
    margin-bottom: 0;
    border-radius: 10px;
  }

  .panel-title {
    font-size: 0.7rem;
    letter-spacing: 1px;
    margin-bottom: 4px;
    padding-bottom: 2px;
  }

  .preview-container {
    padding: 0;
  }

  .preview-container canvas {
    width: 48px;
    height: 48px;
  }

  /* Stats side bar adjustments */
  .sidebar-right .stats-panel {
    flex-direction: row;
    gap: 4px;
    padding: 0;
    background: transparent;
    border: none;
    box-shadow: none;
  }

  .sidebar-right .stats-panel:hover {
    box-shadow: none;
  }

  .stat-box {
    background: rgba(0, 0, 0, 0.2);
    padding: 4px 6px;
    border-radius: 6px;
    border-left: 2px solid;
    text-align: center;
    min-width: 54px;
  }
  
  .stat-box:hover {
    transform: none;
  }

  .stat-label {
    font-size: 0.65rem;
    font-weight: 700;
  }

  .stat-value {
    font-size: 1.05rem;
    margin-top: 1px;
  }

  /* Row 2: Centered Canvas Board */
  .board-area {
    grid-row: 2;
    grid-column: 1;
    height: 100%;
    max-height: 48dvh; /* limit canvas to 48% height */
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
  }

  .board-wrapper {
    width: auto;
    height: 100%;
    max-height: 100%;
    padding: 6px;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
  }

  .hud-top-bar {
    margin-bottom: 4px;
  }

  .icon-btn {
    width: 32px;
    height: 32px;
  }
  
  .icon-btn svg {
    width: 18px;
    height: 18px;
  }

  .canvas-container {
    height: calc(100% - 36px); /* subtract height of hud-top-bar */
    aspect-ratio: 1 / 2;
    width: auto !important; /* let aspect ratio define width */
    max-width: 100%;
  }

  #game-canvas {
    width: 100%;
    height: 100%;
    object-fit: contain;
  }

  /* Overlay HUD sizes */
  .neon-glow-text {
    font-size: 1.4rem;
  }
  .overlay-content {
    padding: 15px;
    gap: 10px;
  }
  .overlay-content p {
    font-size: 0.85rem;
  }
  .btn {
    padding: 8px 20px;
    font-size: 0.85rem;
  }
  #input-player-name {
    padding: 6px;
    font-size: 1rem;
    max-width: 110px;
  }

  /* Row 3: Split Gamepad Controls */
  .mobile-controls {
    grid-row: 3;
    grid-column: 1;
    display: grid;
    grid-template-columns: 1fr auto 1fr; /* Left, Center, Right D-pads */
    align-items: center;
    justify-items: center;
    gap: 4px;
    width: 100%;
    max-width: 100%;
    margin: 4px auto 0 auto;
    padding: 2px 4px;
    height: 24dvh; /* limit controls to 24% height */
    box-sizing: border-box;
    flex-shrink: 0;
  }

  .control-group {
    display: flex;
    gap: 6px;
    height: 100%;
    align-items: center;
  }

  /* Left D-Pad Layout */
  .group-left {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-areas: 
      "left down right";
    width: 100%;
    max-width: 145px;
    gap: 4px;
  }

  .group-left #btn-move-left { grid-area: left; }
  .group-left #btn-soft-drop { grid-area: down; }
  .group-left #btn-move-right { grid-area: right; }

  /* Center Utility Buttons Layout */
  .group-center {
    flex-direction: column;
    justify-content: center;
    gap: 6px;
  }

  /* Right Rotate Buttons Layout */
  .group-right {
    justify-content: flex-end;
    gap: 8px;
    width: 100%;
    max-width: 120px;
  }

  /* Touch buttons design styling */
  .control-btn {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 12px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    touch-action: manipulation; /* prevents 300ms click delay and zooming */
    outline: none;
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.3);
  }

  .dpad-btn {
    height: 46px;
    width: 46px;
    font-size: 1.3rem;
    font-weight: 900;
    color: var(--cyan);
    background: rgba(0, 242, 254, 0.05);
    border-color: rgba(0, 242, 254, 0.25);
  }

  .dpad-btn:active {
    background: rgba(0, 242, 254, 0.25) !important;
    border-color: var(--cyan) !important;
    box-shadow: 0 0 10px rgba(0, 242, 254, 0.4);
    transform: scale(0.95);
  }

  .action-btn {
    border-radius: 50%;
    height: 50px;
    width: 50px;
    font-weight: 800;
  }

  .rotate-cw {
    background: rgba(255, 0, 127, 0.08);
    border-color: rgba(255, 0, 127, 0.35);
    color: var(--magenta);
    font-size: 1.3rem;
  }

  .rotate-cw:active {
    background: rgba(255, 0, 127, 0.25) !important;
    border-color: var(--magenta) !important;
    box-shadow: 0 0 10px rgba(255, 0, 127, 0.4);
    transform: scale(0.95);
  }

  .rotate-ccw {
    background: rgba(157, 78, 221, 0.08);
    border-color: rgba(157, 78, 221, 0.35);
    color: var(--purple);
    font-size: 1.15rem;
  }

  .rotate-ccw:active {
    background: rgba(157, 78, 221, 0.25) !important;
    border-color: var(--purple) !important;
    box-shadow: 0 0 10px rgba(157, 78, 221, 0.4);
    transform: scale(0.95);
  }

  .utility-btn {
    width: 68px;
    height: 28px;
    font-size: 0.65rem;
    font-family: var(--font-logo);
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.03);
    border-color: rgba(255, 255, 255, 0.08);
    color: var(--text-secondary);
  }

  .utility-btn:active {
    background: rgba(255, 255, 255, 0.12) !important;
    transform: scale(0.96);
  }

  #btn-hard-drop {
    border-color: rgba(0, 242, 254, 0.25);
    color: var(--cyan);
    font-weight: 700;
  }

  #btn-hard-drop:active {
    background: rgba(0, 242, 254, 0.12) !important;
  }

  .game-footer {
    display: none !important;
  }
}