/* FLIGHT LEVEL: retro arcade styling, mobile first. */

:root {
	--ink: #e8eef7;
	--ink-dim: #8d9bb2;
	--sky-0: #050813;
	--sky-1: #0a0e1a;
	--sky-2: #131a2e;
	--panel: #1a2338;
	--panel-edge: #2c3a58;
	--go: #35d07f;
	--go-dark: #1d7d4c;
	--warn: #f5b93d;
	--warn-dark: #8a6316;
	--glass: #3aa0d8;
	--pixel: 'Press Start 2P', 'Courier New', monospace;
	--mono: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html, body {
	margin: 0;
	padding: 0;
	min-height: 100%;
}

body {
	background: var(--sky-1);
	background-image: linear-gradient(180deg, var(--sky-0) 0%, var(--sky-2) 60%, #1d2842 100%);
	color: var(--ink);
	font-family: var(--mono);
	font-size: 16px;
	line-height: 1.5;
	-webkit-text-size-adjust: 100%;
	overflow-x: hidden;
}

.sprite-sheet {
	position: absolute;
	width: 0;
	height: 0;
	overflow: hidden;
}

svg { shape-rendering: crispEdges; }

/* Starfield */
.stars {
	position: fixed;
	inset: 0;
	pointer-events: none;
	z-index: 0;
	background-image:
		radial-gradient(1px 1px at 12% 18%, #fff 50%, transparent 50%),
		radial-gradient(1px 1px at 38% 8%, #cfe 50%, transparent 50%),
		radial-gradient(1px 1px at 63% 26%, #fff 50%, transparent 50%),
		radial-gradient(1px 1px at 81% 12%, #9bf 50%, transparent 50%),
		radial-gradient(1px 1px at 27% 41%, #fff 50%, transparent 50%),
		radial-gradient(1px 1px at 91% 37%, #fff 50%, transparent 50%),
		radial-gradient(1px 1px at 52% 52%, #cfe 50%, transparent 50%);
	opacity: 0.55;
}

.stage {
	position: relative;
	z-index: 1;
	max-width: 34rem;
	margin: 0 auto;
	padding: 1.25rem 1rem 2.5rem;
}

/* Screens */
.screen { display: none; }
.screen.is-active { display: block; animation: screen-in 0.28s steps(4) both; }

@keyframes screen-in {
	from { opacity: 0; transform: translateY(0.5rem); }
	to   { opacity: 1; transform: translateY(0); }
}

/* Title */
.wordmark {
	font-family: var(--pixel);
	text-align: center;
	margin: 0.5rem 0 0;
	line-height: 1.35;
}

.wordmark__line {
	display: block;
	font-size: clamp(1.5rem, 9vw, 2.5rem);
	color: var(--ink);
	text-shadow: 3px 3px 0 #000, 0 0 18px rgba(58, 160, 216, 0.5);
}

.wordmark__line--alt { color: var(--glass); }

.hero {
	display: flex;
	justify-content: center;
	margin: 1.25rem 0 1rem;
}

.hero__pilot {
	width: 9.5rem;
	max-width: 46%;
	height: auto;
	filter: drop-shadow(0 3px 0 rgba(0, 0, 0, 0.5));
	animation: bob 2.4s steps(2) infinite alternate;
}

@keyframes bob {
	from { transform: translateY(0); }
	to   { transform: translateY(-3px); }
}

.tagline {
	text-align: center;
	color: var(--ink-dim);
	font-size: 0.85rem;
	margin: 0 0 1.25rem;
}

/* Category picker */
.category-picker {
	display: grid;
	gap: 0.5rem;
	margin-bottom: 1.25rem;
}

.category {
	display: flex;
	flex-direction: column;
	gap: 0.25rem;
	padding: 0.75rem 0.9rem;
	background: var(--panel);
	border: 2px solid var(--panel-edge);
	color: var(--ink);
	font-family: inherit;
	text-align: left;
	cursor: pointer;
}

.category[aria-pressed="true"] {
	border-color: var(--glass);
	box-shadow: inset 0 0 0 1px rgba(58, 160, 216, 0.5);
}

.category--locked { opacity: 0.45; cursor: not-allowed; }

/* Difficulty */
.difficulty {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 0.5rem;
	margin-bottom: 1.25rem;
}

.difficulty__option {
	display: flex;
	flex-direction: column;
	gap: 0.3rem;
	padding: 0.7rem 0.6rem;
	background: var(--panel);
	border: 2px solid var(--panel-edge);
	color: var(--ink-dim);
	font-family: inherit;
	text-align: left;
	cursor: pointer;
}

.difficulty__option[aria-pressed="true"] {
	border-color: var(--go);
	color: var(--ink);
	box-shadow: inset 0 0 0 1px rgba(53, 208, 127, 0.4);
}

.difficulty__name {
	font-family: var(--pixel);
	font-size: 0.7rem;
}

.difficulty__option[aria-pressed="true"] .difficulty__name { color: var(--go); }

.difficulty__hint {
	font-size: 0.68rem;
	line-height: 1.4;
}

.category__label {
	font-family: var(--pixel);
	font-size: 0.7rem;
}

.category__count {
	font-size: 0.75rem;
	color: var(--ink-dim);
}

/* Buttons */
.btn {
	display: block;
	width: 100%;
	margin: 0 0 0.6rem;
	padding: 0.95rem 1rem;
	font-family: var(--pixel);
	font-size: 0.8rem;
	line-height: 1.4;
	color: #04140c;
	background: var(--go);
	border: 0;
	border-bottom: 4px solid var(--go-dark);
	cursor: pointer;
	text-transform: uppercase;
}

.btn:active { transform: translateY(2px); border-bottom-width: 2px; }

.btn--ghost {
	background: transparent;
	color: var(--ink-dim);
	border: 2px solid var(--panel-edge);
	border-bottom-width: 2px;
}

.btn--small {
	width: auto;
	flex: 1;
	padding: 0.7rem 0.75rem;
	font-size: 0.65rem;
}

.btn--quit { margin-top: 1rem; font-size: 0.6rem; padding: 0.7rem; }

.btn:disabled { opacity: 0.5; cursor: progress; }

.sound-toggle {
	display: flex;
	align-items: center;
	justify-content: center;
	gap: 0.5rem;
	margin: 0.75rem 0 1.25rem;
	color: var(--ink-dim);
	font-size: 0.8rem;
	cursor: pointer;
}

.sound-toggle input { width: 1.1rem; height: 1.1rem; accent-color: var(--glass); }

.disclaimer {
	margin: 0;
	padding: 0.75rem;
	border: 1px solid var(--panel-edge);
	color: var(--ink-dim);
	font-size: 0.7rem;
	line-height: 1.6;
	text-align: center;
}

/* HUD */
.hud {
	display: flex;
	justify-content: space-between;
	gap: 0.75rem;
	margin-bottom: 0.75rem;
}

.hud__streak, .hud__alt {
	flex: 1;
	padding: 0.5rem 0.6rem;
	background: var(--panel);
	border: 2px solid var(--panel-edge);
}

.hud__alt { text-align: right; }

.hud__label {
	display: block;
	font-size: 0.6rem;
	letter-spacing: 0.12em;
	color: var(--ink-dim);
}

.hud__value {
	display: block;
	font-family: var(--pixel);
	font-size: 1rem;
	color: var(--glass);
}

.hud__value.is-ticking { animation: tick 0.3s steps(3); }

@keyframes tick {
	50% { transform: scale(1.25); color: var(--go); }
}

/* Flight path */
.flightpath {
	position: relative;
	height: 5.25rem;
	margin-bottom: 0.9rem;
	padding-left: 0.25rem;
}

.tape {
	position: absolute;
	inset: auto 0 0 0;
	height: 0.85rem;
	background: var(--panel);
	border: 2px solid var(--panel-edge);
}

.tape__fill {
	height: 100%;
	width: 0;
	max-width: 100%;
	background: repeating-linear-gradient(90deg, var(--glass) 0 6px, #2a7fae 6px 12px);
	transition: width 0.45s steps(6);
}

.tape__mark {
	position: absolute;
	top: 0;
	bottom: 0;
	width: 2px;
	background: var(--warn);
	opacity: 0.8;
	z-index: 1;
}

.tape__mark::after {
	content: attr(data-mark);
	position: absolute;
	bottom: 0.95rem;
	left: 50%;
	transform: translateX(-50%);
	font-size: 0.55rem;
	line-height: 1;
	color: var(--warn);
	white-space: nowrap;
}

.tape__mark--10k   { left: 22.2%; }
.tape__mark--fl180 { left: 40%; }
.tape__mark--fl450 { left: calc(100% - 2px); }
.tape__mark--fl450::after { transform: translateX(-85%); }

.climber {
	position: absolute;
	bottom: 2.1rem;
	left: 0;
	width: 5rem;
	height: auto;
	transition: left 0.45s steps(6), transform 0.3s steps(3);
	filter: drop-shadow(0 2px 0 rgba(0, 0, 0, 0.5));
}

.climber.is-climbing { animation: climb 0.5s steps(4); }
.climber.is-landing  { animation: land 1.1s steps(6) forwards; }

@keyframes climb {
	0%   { transform: rotate(0deg) translateY(0); }
	40%  { transform: rotate(-8deg) translateY(-8px); }
	100% { transform: rotate(0deg) translateY(0); }
}

@keyframes land {
	0%   { transform: rotate(0deg) translateY(0); }
	60%  { transform: rotate(4deg) translateY(10px); }
	100% { transform: rotate(0deg) translateY(16px); opacity: 0.55; }
}

/* Question card */
.card {
	padding: 1rem 0.9rem 1.1rem;
	background: var(--panel);
	border: 2px solid var(--panel-edge);
}

.card.is-right { animation: pulse-right 0.4s steps(3); }
.card.is-wrong { animation: pulse-wrong 0.4s steps(3); }

@keyframes pulse-right {
	50% { border-color: var(--go); box-shadow: 0 0 0 3px rgba(53, 208, 127, 0.25); }
}

@keyframes pulse-wrong {
	50% { border-color: var(--warn); box-shadow: 0 0 0 3px rgba(245, 185, 61, 0.25); }
}

.card__topic {
	margin: 0 0 0.6rem;
	font-size: 0.6rem;
	letter-spacing: 0.14em;
	text-transform: uppercase;
	color: var(--ink-dim);
}

.card__question {
	margin: 0 0 1rem;
	font-size: 1rem;
	line-height: 1.5;
	font-weight: 600;
}

.choices { display: grid; gap: 0.5rem; }

.choice {
	display: flex;
	align-items: center;
	gap: 0.65rem;
	width: 100%;
	padding: 0.85rem 0.8rem;
	background: #223052;
	border: 2px solid #33456d;
	color: var(--ink);
	font-family: inherit;
	font-size: 0.95rem;
	line-height: 1.4;
	text-align: left;
	cursor: pointer;
}

.choice:active { transform: translateY(1px); }

.choice__key {
	flex: none;
	width: 1.6rem;
	height: 1.6rem;
	display: grid;
	place-items: center;
	background: #33456d;
	font-family: var(--pixel);
	font-size: 0.6rem;
}

.choice.is-right { background: var(--go-dark); border-color: var(--go); }
.choice.is-right .choice__key { background: var(--go); color: #04140c; }
.choice.is-wrong { background: var(--warn-dark); border-color: var(--warn); }
.choice.is-wrong .choice__key { background: var(--warn); color: #1a1204; }
.choice:disabled { cursor: default; }
.choice.is-muted { opacity: 0.45; }

/* Landed screen */
.landed {
	margin: 1rem 0 1.25rem;
	font-family: var(--pixel);
	font-size: clamp(1.1rem, 6.5vw, 1.6rem);
	line-height: 1.6;
	text-align: center;
	color: var(--warn);
	text-shadow: 3px 3px 0 #000;
}

.scorebox {
	padding: 1rem;
	margin-bottom: 1rem;
	background: var(--panel);
	border: 2px solid var(--panel-edge);
	text-align: center;
}

.scorebox__label {
	display: block;
	font-size: 0.6rem;
	letter-spacing: 0.14em;
	color: var(--ink-dim);
}

.scorebox__value {
	display: block;
	font-family: var(--pixel);
	font-size: 2.75rem;
	line-height: 1.4;
	color: var(--go);
	text-shadow: 3px 3px 0 #000;
}

.scorebox__alt { display: block; font-size: 0.8rem; color: var(--ink-dim); }

.reveal {
	padding: 0.9rem;
	margin-bottom: 1rem;
	background: #241d10;
	border: 2px solid var(--warn-dark);
}

.reveal__head {
	margin: 0 0 0.35rem;
	font-size: 0.6rem;
	letter-spacing: 0.14em;
	text-transform: uppercase;
	color: var(--warn);
}

.reveal__answer {
	margin: 0 0 0.6rem;
	font-size: 1.05rem;
	font-weight: 700;
	line-height: 1.45;
}

.reveal__question {
	margin: 0 0 0.6rem;
	font-size: 0.85rem;
	line-height: 1.5;
	color: var(--ink-dim);
}

.reveal__source {
	margin: 0 0 0.75rem;
	font-size: 0.7rem;
	line-height: 1.6;
	color: var(--warn);
	opacity: 0.9;
}

.link-btn {
	padding: 0;
	background: none;
	border: 0;
	border-bottom: 1px dotted var(--ink-dim);
	color: var(--ink-dim);
	font-family: inherit;
	font-size: 0.75rem;
	cursor: pointer;
}

.report { margin-top: 0.85rem; }

.report__label {
	display: block;
	margin-bottom: 0.35rem;
	font-size: 0.7rem;
	color: var(--ink-dim);
}

.report__note {
	width: 100%;
	padding: 0.6rem;
	background: #141a2b;
	border: 2px solid var(--panel-edge);
	color: var(--ink);
	font-family: inherit;
	font-size: 0.9rem;
	resize: vertical;
}

.report__actions { display: flex; gap: 0.5rem; margin-top: 0.5rem; }

.report__status {
	margin: 0.6rem 0 0;
	font-size: 0.75rem;
	color: var(--go);
	min-height: 1.1rem;
}

/* Name entry */
.namebox {
	padding: 1rem 0.9rem;
	margin-bottom: 1rem;
	background: var(--panel);
	border: 2px solid var(--panel-edge);
}

.namebox__label {
	display: block;
	margin-bottom: 0.6rem;
	font-size: 0.75rem;
	color: var(--ink-dim);
}

.namebox__input {
	width: 100%;
	margin-bottom: 0.75rem;
	padding: 0.85rem 0.7rem;
	background: #141a2b;
	border: 2px solid var(--panel-edge);
	color: var(--ink);
	font-family: var(--pixel);
	font-size: 0.85rem;
	text-transform: uppercase;
}

.namebox__input:focus { outline: 2px solid var(--glass); outline-offset: 1px; }

.namebox__status {
	margin: 0.5rem 0 0;
	font-size: 0.75rem;
	color: var(--go);
	min-height: 1.1rem;
}

.namebox.is-done .namebox__input, .namebox.is-done .btn { display: none; }

/* Leaderboard */
.board__title {
	margin: 1rem 0 0.25rem;
	font-family: var(--pixel);
	font-size: 1.1rem;
	text-align: center;
	color: var(--glass);
	text-shadow: 3px 3px 0 #000;
}

.board__scope {
	margin: 0 0 1rem;
	font-size: 0.7rem;
	letter-spacing: 0.14em;
	text-transform: uppercase;
	text-align: center;
	color: var(--ink-dim);
}

.board {
	margin: 0 0 1.25rem;
	padding: 0;
	list-style: none;
	border: 2px solid var(--panel-edge);
}

.board__row {
	display: grid;
	grid-template-columns: 2.25rem 1fr auto;
	gap: 0.5rem;
	align-items: center;
	padding: 0.8rem 0.7rem;
	background: var(--panel);
	border-bottom: 1px solid #22304e;
	font-size: 0.9rem;
}

.board__row:last-child { border-bottom: 0; }
.board__row--mine { background: #1f3a2c; }

.board__rank {
	font-family: var(--pixel);
	font-size: 0.65rem;
	color: var(--ink-dim);
}

.board__row--top .board__rank { color: var(--warn); }

.board__name {
	overflow: hidden;
	text-overflow: ellipsis;
	white-space: nowrap;
	font-family: var(--pixel);
	font-size: 0.6rem;
	line-height: 1.5;
	letter-spacing: 0.02em;
}

.board__score {
	font-family: var(--pixel);
	font-size: 0.8rem;
	color: var(--go);
}

.board__empty {
	margin: 0 0 1.25rem;
	padding: 1.5rem 1rem;
	border: 2px solid var(--panel-edge);
	color: var(--ink-dim);
	font-size: 0.85rem;
	text-align: center;
}

/* Effects */
.flash {
	position: fixed;
	inset: 0;
	z-index: 40;
	pointer-events: none;
	opacity: 0;
}

.flash.is-right { animation: flash-right 0.3s steps(2); }
.flash.is-wrong { animation: flash-wrong 0.45s steps(2); }
.flash.is-milestone { animation: flash-milestone 0.7s steps(4); }

@keyframes flash-right {
	0% { opacity: 0.3; background: var(--go); }
	100% { opacity: 0; background: var(--go); }
}

@keyframes flash-wrong {
	0% { opacity: 0.28; background: var(--warn); }
	100% { opacity: 0; background: var(--warn); }
}

@keyframes flash-milestone {
	0%, 100% { opacity: 0; background: var(--glass); }
	25% { opacity: 0.35; background: var(--glass); }
	60% { opacity: 0.18; background: #fff; }
}

.toast {
	position: fixed;
	left: 50%;
	bottom: 1.5rem;
	z-index: 50;
	transform: translate(-50%, 1.5rem);
	padding: 0.7rem 1rem;
	background: var(--glass);
	color: #03151f;
	font-family: var(--pixel);
	font-size: 0.65rem;
	line-height: 1.5;
	text-align: center;
	opacity: 0;
	pointer-events: none;
	transition: opacity 0.2s steps(2), transform 0.2s steps(2);
}

.toast.is-up { opacity: 1; transform: translate(-50%, 0); }

/* Larger screens */
@media (min-width: 30rem) {
	.stage { padding-top: 2rem; }
	.card__question { font-size: 1.1rem; }
	.hero__pilot { width: 11rem; }
	.flightpath { height: 6rem; }
	.climber { width: 5.75rem; bottom: 2.3rem; }
	.report__actions .btn--small { flex: none; min-width: 9rem; }
}

@media (prefers-reduced-motion: reduce) {
	*, *::before, *::after {
		animation-duration: 0.001s !important;
		animation-iteration-count: 1 !important;
		transition-duration: 0.001s !important;
	}
}