:root {
  color-scheme: dark;
  --cyan: #63fff2;
  --green: #79ff8b;
  --yellow: #ffe66f;
  --orange: #ff9b54;
  --red: #ff4f70;
  --blue: #4fa8ff;
  --ink: #02060c;
  --panel: rgba(3, 15, 24, 0.94);
  --line: rgba(99, 255, 242, 0.42);
  font-family: "Lucida Console", "Cascadia Mono", Consolas, monospace;
}

* { box-sizing: border-box; }
html, body { width: 100%; height: 100%; margin: 0; overflow: hidden; background: #000; }
body { color: #eaffff; user-select: none; }
button, input, select { font: inherit; }
button { touch-action: manipulation; }

#app { position: fixed; inset: 0; overflow: hidden; background: radial-gradient(circle at 50% 40%, #071929 0, #02060d 44%, #000 100%); }
#gameCanvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; outline: none; cursor: crosshair; }
body.retro-pixels #gameCanvas { image-rendering: pixelated; image-rendering: crisp-edges; }

#shieldWash, #screenFx, #scanlines, #vignette { position: absolute; inset: 0; pointer-events: none; }
#shieldWash { opacity: 0; background: linear-gradient(180deg, rgba(38, 118, 255, .14), rgba(0, 190, 255, .05)); mix-blend-mode: screen; transition: opacity .12s linear; }
#screenFx { opacity: 0; background: rgba(255, 40, 50, .35); mix-blend-mode: screen; }
#scanlines { opacity: .36; background: repeating-linear-gradient(180deg, rgba(255,255,255,.035) 0, rgba(255,255,255,.035) 1px, rgba(0,0,0,.07) 2px, rgba(0,0,0,.07) 4px); }
body.no-crt #scanlines { display: none; }
#vignette { box-shadow: inset 0 0 13vw rgba(0,0,0,.9), inset 0 0 2vw rgba(40,170,255,.08); }
body.bloom #gameCanvas { filter: saturate(1.14) contrast(1.04) drop-shadow(0 0 3px rgba(70,255,230,.15)); }

.panel {
  position: absolute;
  left: 50%; top: 50%;
  width: min(650px, calc(100vw - 32px));
  max-height: calc(100vh - 32px);
  overflow: auto;
  transform: translate(-50%, -50%);
  z-index: 20;
  padding: clamp(20px, 3.2vw, 42px);
  border: 1px solid var(--line);
  border-radius: 4px;
  background:
    linear-gradient(135deg, rgba(99,255,242,.07), transparent 32%),
    linear-gradient(315deg, rgba(79,168,255,.06), transparent 38%),
    var(--panel);
  box-shadow: 0 0 0 4px rgba(0,0,0,.55), 0 0 45px rgba(50,190,255,.18), inset 0 0 35px rgba(39,140,190,.08);
  backdrop-filter: blur(9px);
}
.panel::before, .panel::after { content: ""; position: absolute; width: 44px; height: 12px; border-top: 2px solid var(--cyan); top: 10px; opacity: .65; }
.panel::before { left: 12px; border-left: 2px solid var(--cyan); }
.panel::after { right: 12px; border-right: 2px solid var(--cyan); }
.wide-panel { width: min(920px, calc(100vw - 32px)); }
.title-panel { text-align: center; }

.panel-kicker { color: var(--cyan); letter-spacing: .2em; font-size: clamp(.66rem, 1.4vw, .84rem); margin-bottom: 10px; text-shadow: 0 0 12px rgba(99,255,242,.7); }
h1, h2, h3, p { margin-top: 0; }
h1 { font-size: clamp(2rem, 6.2vw, 4.6rem); line-height: .96; margin-bottom: 18px; letter-spacing: .025em; text-shadow: 0 0 8px rgba(255,255,255,.24), 0 0 24px rgba(65,220,255,.32); }
h1 span { display: block; color: var(--yellow); font-size: .46em; letter-spacing: .5em; margin-right: -.5em; margin-bottom: 9px; }
h2 { margin-bottom: 22px; color: var(--yellow); font-size: clamp(1.8rem, 4vw, 3.1rem); letter-spacing: .09em; }
h3 { color: var(--cyan); font-size: .96rem; letter-spacing: .08em; }
.lead { color: #d2f9ff; line-height: 1.6; font-size: clamp(.86rem, 1.6vw, 1rem); }
.tiny { color: #8bb7bf; font-size: .72rem; line-height: 1.45; margin: 18px 0 8px; }
.legal { color: #66838b; font-size: .62rem; margin: 0; }

.menu-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 10px; margin-top: 24px; }
.menu-grid button:first-child:nth-last-child(4), .menu-grid button:first-child:nth-last-child(4) ~ button { }
.menu-row { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-top: 24px; }
button, select {
  color: #dfffff;
  background: rgba(4, 27, 38, .86);
  border: 1px solid rgba(99,255,242,.45);
  border-radius: 3px;
  padding: 12px 15px;
  min-height: 44px;
  letter-spacing: .045em;
  transition: .13s ease;
}
button { cursor: pointer; }
button:hover, button:focus-visible, select:focus-visible { color: #fff; border-color: var(--cyan); background: rgba(8,53,70,.95); box-shadow: 0 0 14px rgba(99,255,242,.23); outline: none; transform: translateY(-1px); }
button.primary { color: #001417; background: linear-gradient(180deg, #87fff3, #36cbbb); border-color: #aafff7; font-weight: 700; }
button.primary:hover { background: linear-gradient(180deg, #c4fff9, #4bf2dd); }
button.danger { color: #ffdce3; border-color: rgba(255,79,112,.6); }
button.danger:hover { border-color: var(--red); background: rgba(80,9,28,.9); }

.difficulty-row { display: grid; grid-template-columns: 1fr 1.55fr; align-items: center; gap: 12px; margin-top: 18px; color: #9ed9df; font-size: .76rem; text-align: left; }
.difficulty-row select { width: 100%; padding: 9px; min-height: 38px; }

.settings-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 15px 24px; text-align: left; }
.settings-grid label { display: grid; grid-template-columns: 1fr auto; gap: 7px; align-items: center; color: #bde8ec; font-size: .78rem; }
.settings-grid label output { color: var(--yellow); }
.settings-grid input[type="range"] { grid-column: 1 / -1; width: 100%; accent-color: #4ce4d3; }
.settings-grid select { grid-column: 1 / -1; width: 100%; padding: 9px; min-height: 38px; }
.settings-grid label.check { display: flex; grid-template-columns: none; gap: 10px; min-height: 36px; }
.settings-grid input[type="checkbox"] { width: 18px; height: 18px; accent-color: #4ce4d3; }

.help-columns { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 20px; text-align: left; }
dl { margin: 0; }
dt { color: var(--yellow); font-size: .72rem; margin-top: 9px; }
dd { color: #b6dadd; margin: 3px 0 0; font-size: .7rem; line-height: 1.35; }
.mission-brief { margin-top: 22px; padding: 15px; border: 1px solid rgba(99,255,242,.22); background: rgba(0,0,0,.24); color: #bbdfe3; font-size: .75rem; line-height: 1.6; text-align: left; }
kbd { color: #001012; background: var(--cyan); border-radius: 2px; padding: 1px 5px; font-weight: bold; }

.status-banner { position: absolute; z-index: 12; top: 22px; left: 50%; transform: translateX(-50%); color: var(--yellow); background: rgba(2,7,12,.82); border: 1px solid rgba(255,230,111,.5); padding: 8px 16px; letter-spacing: .14em; font-size: clamp(.68rem, 1.7vw, .88rem); text-shadow: 0 0 11px currentColor; pointer-events: none; }
.toast { position: absolute; z-index: 14; left: 50%; bottom: 24%; transform: translateX(-50%); max-width: min(720px, calc(100vw - 30px)); color: #eaffff; background: rgba(0,10,17,.88); border-left: 3px solid var(--cyan); border-right: 3px solid var(--cyan); padding: 10px 18px; font-size: clamp(.7rem, 1.6vw, .88rem); letter-spacing: .04em; text-align: center; box-shadow: 0 0 26px rgba(60,230,255,.18); pointer-events: none; }
.pointer-hint { position: absolute; z-index: 13; left: 50%; bottom: 18px; transform: translateX(-50%); color: #a8f7ff; background: rgba(0,0,0,.68); border: 1px solid rgba(99,255,242,.35); padding: 8px 12px; font-size: .65rem; letter-spacing: .1em; pointer-events: none; }
.end-stats { display: grid; grid-template-columns: 1fr auto; gap: 8px 20px; color: #bde5e7; text-align: left; border-top: 1px solid rgba(99,255,242,.25); border-bottom: 1px solid rgba(99,255,242,.25); padding: 16px 4px; }
.end-stats b { color: var(--yellow); text-align: right; }
.hidden { display: none !important; }

@media (max-width: 760px) {
  .panel { padding: 22px 18px; }
  .menu-grid, .settings-grid, .help-columns { grid-template-columns: 1fr; }
  .difficulty-row { grid-template-columns: 1fr; }
  .help-columns { gap: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}