/* ============================================================
   researchim.ai — стили
   RL-first: тёмная нейтральная база + один фирменный акцент
   «reward green» (зелёный = сигнал награды)
   ============================================================ */

:root {
	--bg: #0a0c0b;
	--bg-soft: #0e100f;
	--surface: rgba(255, 255, 255, 0.028);
	--surface-hover: rgba(255, 255, 255, 0.06);
	--border: rgba(255, 255, 255, 0.08);
	--border-strong: rgba(52, 211, 153, 0.22);
	--text: #e8ece9;
	--text-dim: #97a49c;
	--text-faint: #5f6b64;

	/* Фирменный акцент — reward green */
	--accent: #34d399;
	--accent-bright: #6ee7b7;
	--accent-deep: #10b981;
	--penalty: #f2555a; /* используется только как «штраф» внутри RL-игры */

	--grad: linear-gradient(120deg, #6ee7b7 0%, #34d399 55%, #10b981 100%);
	--grad-soft: linear-gradient(120deg, rgba(52, 211, 153, 0.14), rgba(16, 185, 129, 0.08));

	--maxw: 1180px;
	--radius: 18px;
	--radius-sm: 12px;

	--font-display: "Space Grotesk", "Inter", system-ui, sans-serif;
	--font-body: "Inter", system-ui, -apple-system, sans-serif;
	--font-mono: "JetBrains Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }

html {
	scroll-behavior: smooth;
	scroll-padding-top: 90px;
	-webkit-text-size-adjust: 100%;
}

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

body {
	margin: 0;
	background: var(--bg);
	color: var(--text);
	font-family: var(--font-body);
	font-size: 17px;
	line-height: 1.65;
	-webkit-font-smoothing: antialiased;
	text-rendering: optimizeLegibility;
	overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img, svg { display: block; }

::selection {
	background: rgba(52, 211, 153, 0.32);
	color: #fff;
}

/* ---------- Фоновые слои ---------- */
#bg-canvas {
	position: fixed;
	inset: 0;
	width: 100%;
	height: 100%;
	z-index: 0;
	opacity: 0.5;
	pointer-events: none;
}

.bg-grid {
	position: fixed;
	inset: 0;
	z-index: 0;
	pointer-events: none;
	background-image:
		linear-gradient(rgba(255, 255, 255, 0.022) 1px, transparent 1px),
		linear-gradient(90deg, rgba(255, 255, 255, 0.022) 1px, transparent 1px);
	background-size: 56px 56px;
	mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, #000 40%, transparent 100%);
	-webkit-mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, #000 40%, transparent 100%);
}

.bg-glow {
	position: fixed;
	z-index: 0;
	border-radius: 50%;
	filter: blur(120px);
	pointer-events: none;
	opacity: 0.42;
}
.bg-glow--1 {
	width: 520px; height: 520px;
	top: -160px; left: -120px;
	background: radial-gradient(circle, rgba(52, 211, 153, 0.5), transparent 70%);
	animation: float1 18s ease-in-out infinite;
}
.bg-glow--2 {
	width: 560px; height: 560px;
	top: 30%; right: -180px;
	background: radial-gradient(circle, rgba(16, 185, 129, 0.4), transparent 70%);
	animation: float2 22s ease-in-out infinite;
}
@keyframes float1 { 50% { transform: translate(60px, 80px) scale(1.1); } }
@keyframes float2 { 50% { transform: translate(-70px, 40px) scale(1.08); } }

/* ---------- Прогресс скролла ---------- */
.scroll-progress {
	position: fixed;
	top: 0; left: 0;
	height: 3px;
	width: 0%;
	background: var(--grad);
	z-index: 100;
	box-shadow: 0 0 12px rgba(52, 211, 153, 0.6);
}

/* ---------- Навигация ---------- */
.nav {
	position: fixed;
	top: 0; left: 0; right: 0;
	z-index: 90;
	transition: background 0.35s ease, backdrop-filter 0.35s ease, border-color 0.35s ease;
	border-bottom: 1px solid transparent;
}
.nav.scrolled {
	background: rgba(10, 12, 11, 0.74);
	backdrop-filter: blur(14px);
	-webkit-backdrop-filter: blur(14px);
	border-bottom-color: var(--border);
}
.nav__inner {
	max-width: var(--maxw);
	margin: 0 auto;
	padding: 18px 24px;
	display: flex;
	align-items: center;
	gap: 24px;
}

.brand {
	display: flex;
	align-items: center;
	gap: 10px;
	font-family: var(--font-display);
	font-weight: 700;
	font-size: 19px;
	letter-spacing: -0.3px;
}
.brand__mark { display: flex; }
.brand__accent {
	background: var(--grad);
	-webkit-background-clip: text;
	background-clip: text;
	color: transparent;
}

.nav__links { display: flex; gap: 6px; margin-left: auto; }
.nav__links a {
	color: var(--text-dim);
	font-size: 15px;
	font-weight: 500;
	padding: 8px 13px;
	border-radius: 10px;
	transition: color 0.2s, background 0.2s;
}
.nav__links a:hover { color: var(--text); background: var(--surface-hover); }

.nav__actions { display: flex; align-items: center; gap: 10px; }

/* ---------- Кнопки ---------- */
.btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: 9px;
	font-family: var(--font-body);
	font-weight: 600;
	font-size: 15px;
	padding: 10px 18px;
	border-radius: 12px;
	border: 1px solid transparent;
	cursor: pointer;
	transition: transform 0.18s ease, box-shadow 0.25s ease, background 0.25s ease, border-color 0.25s ease, color 0.2s;
	white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn--lg { padding: 14px 26px; font-size: 16px; border-radius: 14px; }
.btn--sm { padding: 9px 14px; font-size: 14px; border-radius: 10px; }

.btn--primary {
	background: var(--grad);
	color: #05231a;
	box-shadow: 0 8px 24px -8px rgba(52, 211, 153, 0.55);
}
.btn--primary:hover {
	transform: translateY(-2px);
	box-shadow: 0 14px 36px -8px rgba(52, 211, 153, 0.7);
}
.btn--ghost {
	background: var(--surface);
	color: var(--text);
	border-color: var(--border);
	backdrop-filter: blur(6px);
}
.btn--ghost:hover {
	background: var(--surface-hover);
	border-color: var(--accent);
	transform: translateY(-2px);
}
.btn--icon { padding: 10px; }
.btn[disabled] { opacity: 0.45; cursor: not-allowed; transform: none; box-shadow: none; }

.nav__burger {
	display: none;
	flex-direction: column;
	gap: 5px;
	background: none; border: 0; cursor: pointer;
	padding: 8px;
}
.nav__burger span {
	width: 24px; height: 2px;
	background: var(--text);
	border-radius: 2px;
	transition: transform 0.3s, opacity 0.3s;
}
.nav__burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Общие секции ---------- */
main { position: relative; z-index: 2; }

.section {
	max-width: var(--maxw);
	margin: 0 auto;
	padding: 100px 24px;
	position: relative;
}
.section__head { max-width: 720px; margin-bottom: 56px; }

.eyebrow {
	font-family: var(--font-mono);
	font-size: 13px;
	color: var(--accent);
	letter-spacing: 1px;
	text-transform: uppercase;
	display: inline-block;
	margin-bottom: 16px;
}
.section__title {
	font-family: var(--font-display);
	font-size: clamp(30px, 5vw, 46px);
	font-weight: 700;
	line-height: 1.1;
	margin: 0 0 18px;
	letter-spacing: -1px;
}
.section__lead { font-size: 18px; color: var(--text-dim); margin: 0; }

.grad-text {
	background: var(--grad);
	-webkit-background-clip: text;
	background-clip: text;
	color: transparent;
}

/* ---------- HERO ---------- */
.hero {
	position: relative;
	z-index: 2;
	min-height: 100vh;
	display: flex;
	flex-direction: column;
	justify-content: center;
	align-items: center;
	text-align: center;
	padding: 140px 24px 90px;
	max-width: 900px;
	margin: 0 auto;
}
.badge {
	display: inline-flex;
	align-items: center;
	gap: 10px;
	font-family: var(--font-mono);
	font-size: 13px;
	color: var(--text-dim);
	background: var(--surface);
	border: 1px solid var(--border);
	padding: 8px 16px;
	border-radius: 999px;
	margin-bottom: 30px;
	backdrop-filter: blur(6px);
}
.badge strong { color: var(--accent); font-weight: 600; }
.badge__dot {
	width: 8px; height: 8px;
	border-radius: 50%;
	background: var(--accent);
	box-shadow: 0 0 10px var(--accent);
	animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse { 50% { opacity: 0.4; transform: scale(0.8); } }

.hero__title {
	font-family: var(--font-display);
	font-size: clamp(40px, 8vw, 78px);
	font-weight: 700;
	line-height: 1.05;
	letter-spacing: -2px;
	margin: 0 0 24px;
}
.hero__subtitle {
	font-size: clamp(17px, 2.4vw, 21px);
	color: var(--text-dim);
	max-width: 660px;
	margin: 0 auto 38px;
}
.hero__actions {
	display: flex; gap: 14px;
	justify-content: center; flex-wrap: wrap;
	margin-bottom: 64px;
}

.hero__stats {
	display: grid;
	grid-template-columns: repeat(4, 1fr);
	gap: 16px;
	width: 100%;
	max-width: 720px;
}
.stat {
	background: var(--surface);
	border: 1px solid var(--border);
	border-radius: var(--radius-sm);
	padding: 22px 14px;
	backdrop-filter: blur(6px);
	transition: transform 0.25s, border-color 0.25s;
}
.stat:hover { transform: translateY(-4px); border-color: var(--border-strong); }
.stat__num {
	display: block;
	font-family: var(--font-display);
	font-size: 30px;
	font-weight: 700;
	color: var(--accent);
	line-height: 1;
	margin-bottom: 8px;
}
.stat__label { font-size: 13px; color: var(--text-faint); }

.scroll-hint {
	position: absolute;
	bottom: 34px; left: 50%;
	transform: translateX(-50%);
	width: 26px; height: 42px;
	border: 2px solid var(--border-strong);
	border-radius: 14px;
	display: flex; justify-content: center;
	padding-top: 8px;
}
.scroll-hint span {
	width: 4px; height: 8px;
	border-radius: 3px;
	background: var(--accent);
	animation: scrollDot 1.8s ease-in-out infinite;
}
@keyframes scrollDot {
	0% { opacity: 0; transform: translateY(-4px); }
	40% { opacity: 1; }
	80% { opacity: 0; transform: translateY(12px); }
	100% { opacity: 0; }
}

/* ---------- Карточки (about) ---------- */
.cards {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
	gap: 20px;
}
.card {
	background: var(--surface);
	border: 1px solid var(--border);
	border-radius: var(--radius);
	padding: 30px 26px;
	position: relative;
	overflow: hidden;
	transition: transform 0.3s ease, border-color 0.3s ease;
}
.card::before {
	content: "";
	position: absolute; inset: 0;
	background: var(--grad-soft);
	opacity: 0;
	transition: opacity 0.35s ease;
}
.card:hover { transform: translateY(-6px); border-color: var(--border-strong); }
.card:hover::before { opacity: 1; }
.card > * { position: relative; z-index: 1; }
.card__icon {
	width: 52px; height: 52px;
	display: flex; align-items: center; justify-content: center;
	border-radius: 14px;
	background: var(--grad-soft);
	border: 1px solid var(--border);
	color: var(--accent);
	margin-bottom: 20px;
}
.card h3 {
	font-family: var(--font-display);
	font-size: 20px;
	margin: 0 0 10px;
	font-weight: 600;
}
.card p { color: var(--text-dim); font-size: 15.5px; margin: 0; }

/* ---------- Timeline (focus) ---------- */
.timeline {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
	gap: 20px;
}
.timeline__item {
	background: var(--surface);
	border: 1px solid var(--border);
	border-radius: var(--radius);
	padding: 28px 26px;
	position: relative;
	transition: transform 0.3s, border-color 0.3s;
}
.timeline__item:hover { transform: translateY(-5px); border-color: var(--border-strong); }
.timeline__step {
	font-family: var(--font-mono);
	font-size: 14px; font-weight: 600;
	color: var(--accent);
	display: inline-block;
	margin-bottom: 14px;
	border: 1px solid var(--border-strong);
	border-radius: 8px;
	padding: 4px 10px;
}
.timeline__item h3 {
	font-family: var(--font-display);
	font-size: 19px; margin: 0 0 8px; font-weight: 600;
}
.timeline__item p { color: var(--text-dim); font-size: 15px; margin: 0; }

/* ---------- RL-песочница (мини-игра) ---------- */
.game {
	display: grid;
	grid-template-columns: 1.2fr 1fr;
	gap: 28px;
	align-items: start;
	background: linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.015));
	border: 1px solid var(--border);
	border-radius: 22px;
	padding: 26px;
}
.game__board { display: flex; flex-direction: column; gap: 16px; }
#gameCanvas {
	width: 100%;
	height: auto;
	border-radius: 14px;
	background: #070908;
	border: 1px solid var(--border);
	touch-action: none;
	cursor: pointer;
}
.game__legend {
	display: flex; flex-wrap: wrap;
	gap: 14px;
	font-size: 13px;
	color: var(--text-dim);
	font-family: var(--font-mono);
}
.game__legend span { display: inline-flex; align-items: center; gap: 7px; }
.game__legend .sq { width: 13px; height: 13px; border-radius: 3px; display: inline-block; }
.sq--agent { background: var(--accent-bright); box-shadow: 0 0 8px var(--accent); }
.sq--goal { background: var(--accent); }
.sq--pit { background: var(--penalty); }
.sq--q { background: linear-gradient(90deg, rgba(52,211,153,0.1), rgba(52,211,153,0.75)); }

.game__panel { display: flex; flex-direction: column; gap: 18px; }
.game__stats {
	display: grid;
	grid-template-columns: repeat(2, 1fr);
	gap: 12px;
}
.game__stats > div {
	background: var(--surface);
	border: 1px solid var(--border);
	border-radius: var(--radius-sm);
	padding: 14px 16px;
}
.game__stats span {
	display: block;
	font-family: var(--font-display);
	font-size: 24px;
	font-weight: 700;
	color: var(--accent);
	line-height: 1.1;
}
.game__stats small {
	font-size: 12px;
	color: var(--text-faint);
	font-family: var(--font-mono);
}
.game__chart {
	width: 100%;
	height: 90px;
	background: #070908;
	border: 1px solid var(--border);
	border-radius: var(--radius-sm);
}
.game__controls {
	display: grid;
	grid-template-columns: repeat(2, 1fr);
	gap: 10px;
}
.game__controls .btn { width: 100%; }
.game__hint {
	font-size: 14px;
	color: var(--text-dim);
	margin: 0;
	min-height: 40px;
	font-family: var(--font-mono);
	line-height: 1.5;
}
.game__hint b { color: var(--accent); font-weight: 600; }

/* ---------- Фильтры проектов ---------- */
.filters {
	display: flex; flex-wrap: wrap; gap: 10px;
	margin-bottom: 32px;
}
.filter {
	font-family: var(--font-body);
	font-size: 14px; font-weight: 500;
	color: var(--text-dim);
	background: var(--surface);
	border: 1px solid var(--border);
	padding: 9px 16px;
	border-radius: 999px;
	cursor: pointer;
	transition: color 0.2s, background 0.2s, border-color 0.2s, transform 0.15s;
}
.filter:hover { color: var(--text); border-color: var(--border-strong); }
.filter:active { transform: scale(0.96); }
.filter.is-active {
	color: #05231a;
	background: var(--grad);
	border-color: transparent;
	font-weight: 600;
}

/* ---------- Проекты ---------- */
.projects {
	display: grid;
	grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
	gap: 22px;
}
.project.is-hidden { display: none; }

.project {
	background: linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.012));
	border: 1px solid var(--border);
	border-radius: var(--radius);
	padding: 28px;
	display: flex;
	flex-direction: column;
	position: relative;
	transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}
.project:hover {
	transform: translateY(-6px);
	border-color: var(--accent);
	box-shadow: 0 20px 48px -20px rgba(52, 211, 153, 0.4);
}
.project__badge {
	position: absolute;
	top: 16px; right: 16px;
	font-family: var(--font-mono);
	font-size: 11px; font-weight: 600;
	letter-spacing: 0.5px; text-transform: uppercase;
	color: #05231a;
	background: var(--grad);
	padding: 4px 10px;
	border-radius: 999px;
	z-index: 2;
}
.project--featured {
	border-color: var(--border-strong);
	box-shadow: 0 0 0 1px rgba(52, 211, 153, 0.12), 0 20px 50px -30px rgba(52, 211, 153, 0.5);
}
.project--featured .project__top { padding-right: 78px; }
@media (min-width: 861px) {
	.project--featured { grid-column: span 2; }
}
.project__top {
	display: flex; align-items: center; justify-content: space-between;
	margin-bottom: 18px;
}
.project__lang {
	display: inline-flex; align-items: center; gap: 8px;
	font-family: var(--font-mono);
	font-size: 13px; color: var(--text-dim);
}
.dot { width: 9px; height: 9px; border-radius: 50%; }
.dot--cyan { background: var(--accent-bright); box-shadow: 0 0 8px var(--accent-bright); }
.dot--violet { background: var(--accent); box-shadow: 0 0 8px var(--accent); }
.dot--blue { background: var(--accent-deep); box-shadow: 0 0 8px var(--accent-deep); }
.project__ext { color: var(--text-faint); transition: color 0.2s, transform 0.2s; }
.project:hover .project__ext { color: var(--accent); transform: translate(2px, -2px); }
.project__name {
	font-family: var(--font-mono);
	font-size: 22px; font-weight: 600;
	margin: 0 0 12px; color: var(--text);
}
.project__desc { color: var(--text-dim); font-size: 15.5px; margin: 0 0 20px; flex-grow: 1; }
.project__tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.project__tags span {
	font-family: var(--font-mono);
	font-size: 12px; color: var(--text-dim);
	background: var(--surface);
	border: 1px solid var(--border);
	padding: 4px 10px; border-radius: 999px;
}
.project__link { font-weight: 600; font-size: 15px; color: var(--accent); transition: color 0.2s; }
.project__link:hover { color: var(--accent-bright); }

/* ---------- Join / Community ---------- */
.join {
	position: relative; overflow: hidden;
	text-align: center;
	background: linear-gradient(180deg, rgba(255,255,255,0.05), rgba(255,255,255,0.02));
	border: 1px solid var(--border-strong);
	border-radius: 28px;
	padding: 72px 40px;
}
.join__glow {
	position: absolute;
	top: -50%; left: 50%;
	transform: translateX(-50%);
	width: 700px; height: 400px;
	background: radial-gradient(circle, rgba(52, 211, 153, 0.22), transparent 65%);
	filter: blur(40px);
	pointer-events: none;
}
.join > * { position: relative; z-index: 1; }
.join__title {
	font-family: var(--font-display);
	font-size: clamp(28px, 5vw, 44px);
	font-weight: 700; letter-spacing: -1px;
	margin: 10px 0 16px;
}
.join__lead { color: var(--text-dim); font-size: 18px; max-width: 560px; margin: 0 auto 34px; }
.join__actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ---------- Footer ---------- */
.footer {
	position: relative; z-index: 2;
	border-top: 1px solid var(--border);
	background: rgba(10, 12, 11, 0.6);
	backdrop-filter: blur(10px);
	margin-top: 40px;
}
.footer__inner {
	max-width: var(--maxw);
	margin: 0 auto;
	padding: 48px 24px;
	display: flex; flex-wrap: wrap;
	gap: 24px; align-items: center; justify-content: space-between;
}
.footer__brand { max-width: 320px; }
.footer__brand .brand__text { font-family: var(--font-display); font-weight: 700; font-size: 20px; }
.footer__brand p { color: var(--text-faint); font-size: 14px; margin: 8px 0 0; }
.footer__links { display: flex; flex-wrap: wrap; gap: 20px; }
.footer__links a { color: var(--text-dim); font-size: 15px; transition: color 0.2s; }
.footer__links a:hover { color: var(--accent); }
.footer__copy {
	color: var(--text-faint);
	font-size: 14px;
	font-family: var(--font-mono);
	margin: 0; width: 100%;
	border-top: 1px solid var(--border);
	padding-top: 20px;
}

/* ---------- Reveal-анимации ---------- */
.reveal {
	opacity: 0;
	transform: translateY(28px);
	transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}
.reveal.is-visible { opacity: 1; transform: none; }
.cards .reveal.is-visible:nth-child(2),
.timeline .reveal.is-visible:nth-child(2),
.projects .reveal.is-visible:nth-child(2) { transition-delay: 0.08s; }
.cards .reveal.is-visible:nth-child(3),
.timeline .reveal.is-visible:nth-child(3),
.projects .reveal.is-visible:nth-child(3) { transition-delay: 0.16s; }
.cards .reveal.is-visible:nth-child(4),
.timeline .reveal.is-visible:nth-child(4) { transition-delay: 0.24s; }

/* ---------- Адаптив ---------- */
@media (max-width: 860px) {
	.nav__links, .nav__actions .btn--ghost { display: none; }
	.nav__burger { display: flex; }

	.nav__links.open {
		display: flex; flex-direction: column;
		position: absolute;
		top: 100%; left: 0; right: 0;
		background: rgba(12, 14, 13, 0.97);
		backdrop-filter: blur(16px);
		border-bottom: 1px solid var(--border);
		padding: 16px 24px 24px;
		gap: 4px;
	}
	.nav__links.open a { padding: 12px 14px; font-size: 16px; }

	.section { padding: 72px 20px; }
	.hero { padding: 130px 20px 80px; }
	.hero__stats { grid-template-columns: repeat(2, 1fr); }
	.join { padding: 52px 24px; }

	.game { grid-template-columns: 1fr; padding: 20px; }
}

@media (max-width: 460px) {
	body { font-size: 16px; }
	.hero__actions .btn { width: 100%; }
	.hero__stats { gap: 12px; }
	.stat { padding: 18px 10px; }
	.stat__num { font-size: 24px; }
	.game__controls { grid-template-columns: 1fr; }
}