/* ============================================================================
   SIGNAL BOX CHALLENGE — GAME STYLES
   Retro railway aesthetics meets arcade gameplay
   ============================================================================ */

/* ==================== RESET & BASE ==================== */

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-display);
  background: var(--surface-crt);
  color: var(--text-inverse);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Paper theme overrides */
[data-theme="paper"] body {
  background: var(--surface-paper);
  color: var(--text-primary);
}

/* ==================== SKIP LINK ==================== */

.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  background: var(--warning-yellow);
  color: var(--ink-black);
  padding: var(--space-sm) var(--space-base);
  z-index: 9999;
  text-decoration: none;
  font-weight: bold;
}

.skip-link:focus {
  top: 0;
}

/* ==================== GAME HEADER ==================== */

.game-header {
  background: var(--rail-blue);
  border-bottom: 4px solid var(--warning-yellow);
  padding: var(--space-base) var(--gutter);
  text-align: center;
}

.header-inner {
  max-width: 1000px;
  margin: 0 auto;
}

.back-link {
  color: var(--warning-yellow);
  text-decoration: none;
  font-size: var(--text-sm);
  display: inline-block;
  margin-bottom: var(--space-xs);
  opacity: 0.8;
  transition: opacity 0.2s;
}

.back-link:hover {
  opacity: 1;
  text-decoration: underline;
}

.game-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  color: var(--text-inverse);
  margin: 0;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-shadow: 2px 2px 0 rgba(0, 0, 0, 0.3);
}

.game-tagline {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--platform-concrete);
  margin: var(--space-xs) 0 0;
  font-style: italic;
}

/* ==================== GAME CONTAINER ==================== */

.game-container {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--space-lg) var(--gutter);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

/* ==================== STATS PANEL ==================== */

.stats-panel {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-base);
}

.stat-box {
  background: rgba(0, 60, 127, 0.8);
  border: 2px solid var(--rail-blue);
  padding: var(--space-base);
  text-align: center;
}

[data-theme="paper"] .stat-box {
  background: rgba(0, 60, 127, 0.1);
  border-color: var(--rail-blue);
}

.stat-label {
  display: block;
  font-size: var(--text-xs);
  color: var(--platform-concrete);
  letter-spacing: 0.15em;
  margin-bottom: var(--space-2xs);
}

.stat-value {
  display: block;
  font-size: var(--text-xl);
  font-weight: var(--weight-bold);
  color: var(--warning-yellow);
}

.stat-delays {
  color: var(--signal-red);
}

.stat-combo {
  color: var(--signal-green);
}

/* ==================== PLATFORM GRID ==================== */

.platform-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-base);
  perspective: 1000px;
}

@media (max-width: 600px) {
  .platform-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .stats-panel {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Individual Platform */
.platform {
  background: linear-gradient(180deg, #1a1a1a 0%, #2d2d2d 100%);
  border: 3px solid var(--platform-concrete);
  border-radius: 4px;
  padding: var(--space-base);
  min-height: 180px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  user-select: none;
}

[data-theme="paper"] .platform {
  background: linear-gradient(180deg, #e8e6dc 0%, #d4d2c5 100%);
}

.platform:hover:not(.platform--empty) {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.platform:active:not(.platform--empty) {
  transform: translateY(0);
}

.platform--empty {
  opacity: 0.5;
  cursor: default;
}

/* Platform Header */
.platform-number {
  font-size: var(--text-2xl);
  font-weight: var(--weight-bold);
  color: var(--warning-yellow);
  text-align: center;
  text-shadow: 0 0 10px rgba(255, 215, 0, 0.5);
}

[data-theme="paper"] .platform-number {
  color: var(--rail-blue);
  text-shadow: none;
}

/* Train Info Display */
.train-info {
  text-align: center;
}

.train-destination {
  font-size: var(--text-base);
  font-weight: var(--weight-bold);
  color: var(--text-inverse);
  letter-spacing: 0.05em;
  margin-bottom: var(--space-2xs);
}

[data-theme="paper"] .train-destination {
  color: var(--text-primary);
}

.train-time {
  font-size: var(--text-sm);
  color: var(--platform-concrete);
}

/* Platform Signal Light */
.platform-signal {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  margin: 0 auto;
  background: #333;
  border: 2px solid #555;
  transition: all 0.2s ease;
}

.platform-signal--red {
  background: var(--signal-red);
  box-shadow: 0 0 15px var(--signal-red), inset 0 0 10px rgba(255, 255, 255, 0.3);
}

.platform-signal--yellow {
  background: var(--warning-yellow);
  box-shadow: 0 0 15px var(--warning-yellow), inset 0 0 10px rgba(255, 255, 255, 0.3);
  animation: blink-yellow 0.3s ease-in-out infinite;
}

.platform-signal--green {
  background: var(--signal-green);
  box-shadow: 0 0 15px var(--signal-green), inset 0 0 10px rgba(255, 255, 255, 0.3);
}

@keyframes blink-yellow {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

/* Progress Timer Bar */
.platform-timer {
  height: 6px;
  background: #333;
  border-radius: 3px;
  overflow: hidden;
  margin-top: var(--space-xs);
}

.platform-timer-fill {
  height: 100%;
  background: var(--signal-green);
  transition: width 0.1s linear, background 0.3s;
  width: 100%;
}

.platform-timer-fill.warning {
  background: var(--warning-yellow);
}

.platform-timer-fill.critical {
  background: var(--signal-red);
  animation: pulse-critical 0.3s ease-in-out infinite;
}

@keyframes pulse-critical {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

/* Dispatch Flash Effect */
.platform--dispatched {
  animation: dispatch-flash 0.4s ease-out;
}

@keyframes dispatch-flash {
  0% {
    background: var(--signal-green);
    transform: scale(1.02);
  }
  100% {
    background: linear-gradient(180deg, #1a1a1a 0%, #2d2d2d 100%);
    transform: scale(1);
  }
}

[data-theme="paper"] .platform--dispatched {
  animation: dispatch-flash-paper 0.4s ease-out;
}

@keyframes dispatch-flash-paper {
  0% {
    background: var(--signal-green);
    transform: scale(1.02);
  }
  100% {
    background: linear-gradient(180deg, #e8e6dc 0%, #d4d2c5 100%);
    transform: scale(1);
  }
}

/* Delay Flash Effect */
.platform--delayed {
  animation: delay-flash 0.5s ease-out;
}

@keyframes delay-flash {
  0%, 20%, 40%, 60%, 80% {
    background: var(--signal-red);
  }
  10%, 30%, 50%, 70%, 90%, 100% {
    background: linear-gradient(180deg, #1a1a1a 0%, #2d2d2d 100%);
  }
}

/* ==================== SIGNAL TOWER ==================== */

.signal-tower {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-base);
  background: var(--ink-black);
  border: 2px solid var(--platform-concrete);
}

[data-theme="paper"] .signal-tower {
  background: var(--surface-platform);
}

.signal-light {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: #333;
  border: 3px solid #555;
  transition: all 0.3s ease;
}

.signal-light.green {
  background: var(--signal-green);
  box-shadow: 0 0 20px var(--signal-green), 0 0 40px var(--signal-green);
}

.signal-light.yellow {
  background: var(--warning-yellow);
  box-shadow: 0 0 20px var(--warning-yellow), 0 0 40px var(--warning-yellow);
}

.signal-light.red {
  background: var(--signal-red);
  box-shadow: 0 0 20px var(--signal-red), 0 0 40px var(--signal-red);
}

.signal-text {
  font-size: var(--text-sm);
  letter-spacing: 0.2em;
  color: var(--platform-concrete);
}

/* ==================== MESSAGE BOARD ==================== */

.message-board {
  background: var(--ink-black);
  border: 3px solid var(--warning-yellow);
  padding: var(--space-base);
  text-align: center;
  min-height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
}

[data-theme="paper"] .message-board {
  background: var(--rail-blue);
  color: var(--text-inverse);
}

#gameMessage {
  font-size: var(--text-base);
  color: var(--warning-yellow);
  margin: 0;
  letter-spacing: 0.1em;
  animation: message-pulse 2s ease-in-out infinite;
}

[data-theme="paper"] #gameMessage {
  color: var(--warning-yellow);
}

@keyframes message-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

.message-board.success #gameMessage {
  color: var(--signal-green);
  animation: none;
}

.message-board.warning #gameMessage {
  color: var(--signal-red);
  animation: none;
}

/* ==================== CONTROL PANEL ==================== */

.control-panel {
  display: flex;
  justify-content: center;
  gap: var(--space-base);
  flex-wrap: wrap;
}

.btn-control {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: var(--weight-bold);
  padding: var(--space-sm) var(--space-lg);
  border: 3px solid;
  cursor: pointer;
  transition: all 0.15s ease;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.btn-start {
  background: var(--signal-green);
  border-color: #1b5e20;
  color: white;
}

.btn-start:hover:not(:disabled) {
  background: #43a047;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(46, 125, 50, 0.4);
}

.btn-pause {
  background: var(--warning-yellow);
  border-color: #f9a825;
  color: var(--ink-black);
}

.btn-pause:hover:not(:disabled) {
  background: #ffea00;
  transform: translateY(-2px);
}

.btn-pause:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-theme {
  background: var(--rail-blue);
  border-color: var(--rail-blue-dark);
  color: white;
}

.btn-theme:hover {
  background: var(--rail-blue-dark);
}

.btn-restart {
  background: var(--rail-blue);
  border-color: var(--rail-blue-dark);
  color: white;
  font-size: var(--text-lg);
  padding: var(--space-base) var(--space-xl);
}

.btn-restart:hover {
  background: var(--signal-green);
  border-color: #1b5e20;
  transform: scale(1.05);
}

.btn-control:focus {
  outline: 3px solid var(--warning-yellow);
  outline-offset: 2px;
}

/* ==================== INSTRUCTIONS PANEL ==================== */

.instructions-panel {
  background: rgba(0, 60, 127, 0.2);
  border: 2px solid var(--rail-blue);
  padding: var(--space-lg);
}

[data-theme="paper"] .instructions-panel {
  background: rgba(0, 60, 127, 0.1);
}

.instructions-panel h2 {
  font-size: var(--text-base);
  color: var(--warning-yellow);
  margin: 0 0 var(--space-base);
  letter-spacing: 0.15em;
}

[data-theme="paper"] .instructions-panel h2 {
  color: var(--rail-blue);
}

.instructions-panel ul {
  margin: 0;
  padding-left: var(--space-lg);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
}

.instructions-panel li {
  margin-bottom: var(--space-xs);
}

.instructions-panel kbd {
  display: inline-block;
  background: var(--ink-black);
  color: var(--warning-yellow);
  border: 1px solid var(--platform-concrete);
  border-radius: 3px;
  padding: 2px 8px;
  font-family: var(--font-display);
  font-size: var(--text-xs);
}

[data-theme="paper"] .instructions-panel kbd {
  background: var(--rail-blue);
  color: white;
}

.text-green {
  color: var(--signal-green);
  font-weight: bold;
}

.text-red {
  color: var(--signal-red);
  font-weight: bold;
}

/* ==================== GAME OVER OVERLAY ==================== */

.overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  backdrop-filter: blur(4px);
}

.overlay[hidden] {
  display: none;
}

.overlay-content {
  background: var(--ink-black);
  border: 4px solid var(--warning-yellow);
  padding: var(--space-2xl);
  text-align: center;
  max-width: 400px;
  width: 90%;
}

.overlay-title {
  font-size: var(--text-2xl);
  color: var(--signal-red);
  margin: 0 0 var(--space-lg);
  letter-spacing: 0.15em;
  animation: title-flash 0.5s ease-in-out 3;
}

.overlay-title.win {
  color: var(--signal-green);
}

@keyframes title-flash {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.final-stats {
  font-family: var(--font-display);
  font-size: var(--text-base);
  margin-bottom: var(--space-lg);
}

.final-stats p {
  margin: var(--space-xs) 0;
  color: var(--platform-concrete);
}

.final-stats span {
  color: var(--warning-yellow);
  font-weight: bold;
}

/* ==================== CRT SCANLINE EFFECT ==================== */

[data-theme="crt"] body::after {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: repeating-linear-gradient(
    180deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, 0.1) 2px,
    rgba(0, 0, 0, 0.1) 4px
  );
  pointer-events: none;
  z-index: 9999;
}

/* ==================== REDUCED MOTION ==================== */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ==================== SCORE POPUP ==================== */

.score-popup {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: var(--text-lg);
  font-weight: bold;
  pointer-events: none;
  animation: score-float 0.8s ease-out forwards;
  z-index: 100;
}

.score-popup.bonus {
  color: var(--signal-green);
}

.score-popup.penalty {
  color: var(--signal-red);
}

@keyframes score-float {
  0% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
  100% {
    opacity: 0;
    transform: translate(-50%, -150%) scale(1.5);
  }
}