:root {
  --crt-bg: #050a07;
  --crt-panel: #0a140e;
  --crt-border: #1e4d2b;
  --crt-green: #00ff66;
  --crt-green-dim: #198a47;
  --crt-amber: #ffb000;
  --crt-red: #ff2a2a;
  --crt-cyan: #00e5ff;
  --crt-text: #d7ffe6;
  --font-mono: 'JetBrains Mono', 'Cascadia Mono', 'Fira Code', 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
}

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

[hidden] {
  display: none !important;
}

html,
body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  background-color: var(--crt-bg);
  background-image: radial-gradient(circle at 50% 35%, rgba(0, 255, 102, 0.06) 0%, rgba(5, 10, 7, 0.96) 78%);
  color: var(--crt-text);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.35;
  touch-action: manipulation;
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
  -webkit-font-smoothing: antialiased;
}

button,
input {
  font-family: inherit;
  touch-action: manipulation;
}

/* Non-blocking CRT scanlines & error flash */
.crt-scanlines {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 900;
  background: repeating-linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0) 0px,
    rgba(0, 0, 0, 0) 2px,
    rgba(0, 0, 0, 0.22) 3px,
    rgba(0, 0, 0, 0.22) 4px
  );
}

#flash-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 999;
  background: rgba(255, 25, 25, 0.55);
  opacity: 0;
}

#flash-overlay.active {
  animation: crt-error-flash 320ms ease-out forwards;
}

@keyframes crt-error-flash {
  0% {
    opacity: 1;
  }
  30% {
    opacity: 0.85;
  }
  100% {
    opacity: 0;
  }
}

/* Main mobile-first shell */
.crt-shell {
  width: 100%;
  max-width: 480px;
  height: 100vh;
  height: 100dvh;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-left: 1px solid rgba(30, 77, 43, 0.45);
  border-right: 1px solid rgba(30, 77, 43, 0.45);
  background: rgba(5, 10, 7, 0.88);
  position: relative;
}

/* Fixed compact top HUD */
.hud {
  flex-shrink: 0;
  background: var(--crt-panel);
  border-bottom: 1px solid var(--crt-border);
  padding: 8px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.55);
}

.hud-top,
.hud-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.seed-badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 7px;
  border: 1px solid var(--crt-border);
  border-radius: 3px;
  background: rgba(0, 255, 102, 0.06);
  color: var(--crt-green);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.seed-badge.is-practice {
  border-color: rgba(255, 176, 0, 0.55);
  background: rgba(255, 176, 0, 0.1);
  color: var(--crt-amber);
}

.lives-display {
  font-size: 1rem;
  letter-spacing: 0.12em;
  line-height: 1;
  white-space: nowrap;
}

.hud-mute-btn {
  min-width: 82px;
  font-size: 0.72rem;
  padding: 4px 8px;
  min-height: 28px;
}

.hud-mute-btn.is-muted {
  border-color: rgba(255, 176, 0, 0.6);
  color: var(--crt-amber);
}

.round-indicators {
  display: flex;
  align-items: center;
  gap: 4px;
}

.round-led {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  height: 24px;
  padding: 0 4px;
  font-size: 0.75rem;
  font-weight: 700;
  border: 1px solid var(--crt-border);
  border-radius: 3px;
  color: var(--crt-green-dim);
  background: rgba(5, 10, 7, 0.9);
  transition: border-color 120ms ease, color 120ms ease, background-color 120ms ease;
}

.round-led.is-active {
  border-color: var(--crt-cyan);
  color: var(--crt-cyan);
  background: rgba(0, 229, 255, 0.12);
  box-shadow: 0 0 8px rgba(0, 229, 255, 0.25);
}

.round-led.is-won {
  border-color: var(--crt-green);
  color: var(--crt-bg);
  background: var(--crt-green);
}

.round-led.is-lost {
  border-color: var(--crt-red);
  color: #ffffff;
  background: var(--crt-red);
}

.timer-display {
  font-size: 1.38rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
  color: var(--crt-green);
  text-shadow: 0 0 8px rgba(0, 255, 102, 0.35);
  min-width: 78px;
  text-align: right;
  line-height: 1;
}

.timer-display.is-amber {
  color: var(--crt-amber);
  text-shadow: 0 0 10px rgba(255, 176, 0, 0.4);
}

.timer-display.is-critical {
  color: var(--crt-red);
  text-shadow: 0 0 12px rgba(255, 42, 42, 0.65);
  animation: timer-pulse 450ms ease-in-out infinite alternate;
}

@keyframes timer-pulse {
  from {
    opacity: 1;
    transform: scale(1);
  }
  to {
    opacity: 0.7;
    transform: scale(1.04);
  }
}

/* Main stage */
.stage {
  flex: 1;
  min-height: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  padding: 10px 12px;
}

.screen {
  display: none;
  flex: 1;
  min-height: 0;
  flex-direction: column;
  overflow: hidden;
}

.screen.is-active {
  display: flex;
}

/* Standby screen */
#screen-standby {
  justify-content: center;
  gap: 14px;
}

.standby-hero {
  text-align: center;
  flex-shrink: 0;
}

.terminal-tag {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--crt-green-dim);
  margin-bottom: 4px;
}

.terminal-title {
  margin: 0;
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--crt-green);
  text-shadow: 0 0 14px rgba(0, 255, 102, 0.35);
}

.standby-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.briefing-text {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.5;
  color: var(--crt-text);
  text-align: center;
}

.briefing-text strong {
  color: var(--crt-amber);
}

.briefing-sub {
  margin: 0;
  font-size: 0.78rem;
  color: var(--crt-green-dim);
  text-align: center;
}

.standby-done-label {
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  text-align: center;
  color: var(--crt-cyan);
  font-weight: 700;
}

/* Playing screen */
#screen-playing {
  gap: 6px;
}

.module-meta {
  flex-shrink: 0;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--crt-cyan);
  padding: 4px 8px;
  background: rgba(0, 229, 255, 0.06);
  border: 1px solid rgba(0, 229, 255, 0.25);
  border-radius: 3px;
  text-transform: uppercase;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.module-container {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* End screen */
#screen-end {
  justify-content: center;
}

.end-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.end-mode-badge {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-align: center;
  color: var(--crt-cyan);
}

.end-title {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-align: center;
}

.end-title.is-win {
  color: var(--crt-green);
  text-shadow: 0 0 12px rgba(0, 255, 102, 0.35);
}

.end-title.is-lose {
  color: var(--crt-red);
  text-shadow: 0 0 12px rgba(255, 42, 42, 0.45);
}

.end-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.stat-box {
  background: rgba(5, 10, 7, 0.85);
  border: 1px solid var(--crt-border);
  border-radius: 3px;
  padding: 8px;
  text-align: center;
}

.stat-box--full {
  grid-column: 1 / -1;
}

.stat-label {
  display: block;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--crt-green-dim);
  margin-bottom: 3px;
}

.stat-value {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--crt-text);
}

.share-preview {
  margin: 0;
  padding: 10px;
  background: rgba(5, 10, 7, 0.95);
  border: 1px dashed var(--crt-border);
  border-radius: 3px;
  font-family: inherit;
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--crt-text);
  white-space: pre-wrap;
  word-break: break-word;
  text-align: center;
  user-select: text;
  -webkit-user-select: text;
}

.end-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* ==========================================================================
   Shared Module & Terminal Utility Classes
   ========================================================================== */

.crt-panel {
  background: var(--crt-panel);
  border: 1px solid var(--crt-border);
  border-radius: 4px;
  padding: 10px;
  box-shadow: inset 0 0 16px rgba(0, 255, 102, 0.04);
}

.crt-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 40px;
  padding: 8px 12px;
  border: 1px solid var(--crt-border);
  border-radius: 4px;
  background: rgba(10, 20, 14, 0.92);
  color: var(--crt-text);
  font-size: 0.86rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-align: center;
  cursor: pointer;
  transition: background-color 100ms ease, border-color 100ms ease, color 100ms ease, box-shadow 100ms ease, transform 60ms ease;
}

.crt-btn:hover:not(:disabled) {
  border-color: var(--crt-green);
  background: rgba(0, 255, 102, 0.12);
}

.crt-btn:active:not(:disabled) {
  transform: translateY(1px);
}

.crt-btn:focus-visible {
  outline: 2px solid var(--crt-cyan);
  outline-offset: 2px;
}

.crt-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.crt-btn--primary {
  border-color: var(--crt-green);
  color: var(--crt-green);
  background: rgba(0, 255, 102, 0.1);
  box-shadow: 0 0 10px rgba(0, 255, 102, 0.12);
}

.crt-btn--primary:hover:not(:disabled) {
  background: rgba(0, 255, 102, 0.2);
  box-shadow: 0 0 14px rgba(0, 255, 102, 0.25);
}

.crt-btn--danger {
  border-color: var(--crt-red);
  color: var(--crt-red);
  background: rgba(255, 42, 42, 0.1);
}

.crt-btn--danger:hover:not(:disabled) {
  background: rgba(255, 42, 42, 0.22);
}

.crt-btn--amber {
  border-color: var(--crt-amber);
  color: var(--crt-amber);
  background: rgba(255, 176, 0, 0.08);
}

.crt-btn--amber:hover:not(:disabled) {
  background: rgba(255, 176, 0, 0.2);
}

.crt-btn--cyan {
  border-color: var(--crt-cyan);
  color: var(--crt-cyan);
  background: rgba(0, 229, 255, 0.08);
}

.crt-btn--cyan:hover:not(:disabled) {
  background: rgba(0, 229, 255, 0.18);
}

.crt-btn--sm {
  min-height: 32px;
  padding: 5px 8px;
  font-size: 0.76rem;
}

.crt-btn--lg {
  min-height: 48px;
  padding: 12px 16px;
  font-size: 0.96rem;
}

.crt-btn.is-active,
.crt-btn[aria-pressed='true'] {
  background: var(--crt-green);
  color: var(--crt-bg);
  border-color: var(--crt-green);
}

/* Module sub-structure classes */
.mod-header {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 8px 10px;
  margin-bottom: 8px;
  background: rgba(0, 255, 102, 0.04);
  border: 1px solid var(--crt-border);
  border-left: 3px solid var(--crt-green);
  border-radius: 3px;
}

.mod-title {
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--crt-green);
  text-transform: uppercase;
}

.mod-instruction {
  font-size: 0.84rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--crt-text);
}

.mod-body {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 8px;
  overflow: hidden;
}

.mod-footer {
  flex-shrink: 0;
  display: flex;
  gap: 8px;
  padding-top: 6px;
}

.crt-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.crt-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.crt-status {
  padding: 6px 8px;
  border: 1px dashed var(--crt-border);
  border-radius: 3px;
  background: rgba(5, 10, 7, 0.85);
  color: var(--crt-amber);
  font-size: 0.78rem;
  font-weight: 600;
  text-align: center;
}

.crt-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 2px 6px;
  border: 1px solid var(--crt-border);
  border-radius: 3px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.crt-bar {
  width: 100%;
  height: 14px;
  background: rgba(5, 10, 7, 0.95);
  border: 1px solid var(--crt-border);
  border-radius: 3px;
  overflow: hidden;
}

.crt-bar-fill {
  height: 100%;
  background: var(--crt-green);
  transition: width 60ms linear;
}

.crt-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 32px;
  background: transparent;
  cursor: pointer;
}

.crt-slider::-webkit-slider-runnable-track {
  height: 8px;
  background: rgba(30, 77, 43, 0.65);
  border: 1px solid var(--crt-border);
  border-radius: 4px;
}

.crt-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 26px;
  height: 26px;
  margin-top: -10px;
  border-radius: 3px;
  background: var(--crt-green);
  border: 2px solid var(--crt-bg);
  box-shadow: 0 0 8px rgba(0, 255, 102, 0.6);
}

.crt-slider::-moz-range-track {
  height: 8px;
  background: rgba(30, 77, 43, 0.65);
  border: 1px solid var(--crt-border);
  border-radius: 4px;
}

.crt-slider::-moz-range-thumb {
  width: 26px;
  height: 26px;
  border-radius: 3px;
  background: var(--crt-green);
  border: 2px solid var(--crt-bg);
  box-shadow: 0 0 8px rgba(0, 255, 102, 0.6);
}

.text-green { color: var(--crt-green); }
.text-amber { color: var(--crt-amber); }
.text-red { color: var(--crt-red); }
.text-cyan { color: var(--crt-cyan); }
.text-dim { color: var(--crt-green-dim); }

/* Very compact viewport safeguard (e.g. 375x600 or short mobile viewport) */
@media (max-height: 620px) {
  .hud {
    padding: 6px 10px;
    gap: 4px;
  }
  .stage {
    padding: 6px 10px;
  }
  .terminal-title {
    font-size: 1.65rem;
  }
  .mod-header {
    padding: 6px 8px;
    margin-bottom: 6px;
  }
  .crt-btn {
    min-height: 36px;
  }
  .crt-btn--lg {
    min-height: 42px;
  }
}