/* ==========================================================================
   memgo — единая таблица стилей (без сборки, один файл).
   Светлая тема по умолчанию + автоматическая тёмная через prefers-color-scheme.
   ========================================================================== */

/* ---------- Переменные ---------- */
:root {
	--bg: #f7f7fb;
	--surface: #ffffff;
	--surface-2: #f0f0f6;
	--text: #1a1a2e;
	--text-muted: #6b6b80;
	--border: #e4e4ee;

	--accent: #6d5efc;
	--accent-2: #9a6bff;
	--accent-contrast: #ffffff;
	--accent-soft: #eeebff;

	--success: #16a34a;
	--success-soft: #e8f7ee;
	--danger: #dc2626;
	--danger-soft: #fdecec;

	--radius: 14px;
	--radius-sm: 8px;
	--shadow: 0 1px 2px rgb(20 20 40 / .06), 0 8px 24px rgb(20 20 40 / .08);
	--font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
	:root {
		--bg: #101018;
		--surface: #191926;
		--surface-2: #22223a;
		--text: #ececf5;
		--text-muted: #9a9ab2;
		--border: #2c2c44;
		--accent-soft: #2a2450;
		--success-soft: #12301e;
		--danger-soft: #3a1a1e;
		--shadow: 0 8px 24px rgb(0 0 0 / .4);
	}
}

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

html { scroll-behavior: smooth; }

body {
	margin: 0;
	font-family: var(--font);
	font-size: 1rem;
	line-height: 1.65;
	background: var(--bg);
	color: var(--text);
	-webkit-font-smoothing: antialiased;
}

h1, h2, h3 { line-height: 1.2; letter-spacing: -0.015em; }
h1 { font-size: 2rem; margin: 0; font-weight: 750; }
h2 { font-size: 1.6rem; margin: 0 0 .6rem; font-weight: 700; }
h3 { font-size: 1.1rem; margin: 0 0 .35rem; font-weight: 650; }
p { margin: .4rem 0; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; }

.muted { color: var(--text-muted); }

.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

[hidden] { display: none !important; }

:focus-visible {
	outline: 2px solid var(--accent);
	outline-offset: 2px;
	border-radius: 4px;
}

::selection { background: var(--accent-soft); }

/* ---------- Кнопки ---------- */
.btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: 8px;
	padding: .6rem 1.2rem;
	border-radius: var(--radius-sm);
	border: 1px solid transparent;
	font: inherit;
	font-weight: 600;
	cursor: pointer;
	text-decoration: none;
	color: var(--text);
	background: var(--surface);
	transition: transform .12s ease, box-shadow .12s ease, background .12s ease, border-color .12s ease;
}
.btn:hover { text-decoration: none; }

.btn-primary {
	background: linear-gradient(135deg, var(--accent), var(--accent-2));
	color: var(--accent-contrast);
	box-shadow: 0 6px 16px rgb(109 94 252 / .25);
}
.btn-primary:hover {
	transform: translateY(-1px);
	box-shadow: 0 8px 22px rgb(109 94 252 / .35);
}

.btn-ghost { border-color: var(--border); }
.btn-ghost:hover { background: var(--surface-2); }

.btn-danger { border-color: var(--danger); color: var(--danger); background: transparent; }
.btn-danger:hover { background: var(--danger-soft); }

.btn:active { transform: translateY(0); }
.btn-sm { padding: .35rem .85rem; font-size: .9rem; }
.btn-lg { padding: .75rem 1.6rem; font-size: 1.05rem; }
.btn-block { width: 100%; }

/* ---------- Карточки, формы, баннеры ---------- */
.card {
	background: var(--surface);
	border: 1px solid var(--border);
	border-radius: var(--radius);
	box-shadow: var(--shadow);
}

label { display: block; font-weight: 600; font-size: .925rem; margin-bottom: .3rem; }

input[type="text"], input[type="password"] {
	width: 100%;
	padding: .65rem .9rem;
	border-radius: var(--radius-sm);
	border: 1px solid var(--border);
	background: var(--surface);
	color: var(--text);
	font: inherit;
}
input[type="text"]::placeholder, input[type="password"]::placeholder { color: var(--text-muted); opacity: .7; }
input[type="text"]:focus, input[type="password"]:focus {
	outline: 2px solid var(--accent);
	outline-offset: 1px;
	border-color: transparent;
}
input:disabled { opacity: .6; }

.banner {
	display: flex;
	gap: 12px;
	align-items: flex-start;
	border-radius: var(--radius-sm);
	padding: .8rem 1rem;
	font-weight: 500;
}
.banner ul { margin: .25rem 0 0; padding-left: 1.2rem; }
.banner p { margin: 0; }
.banner-icon { font-weight: 800; }
.banner-success { background: var(--success-soft); border-left: 4px solid var(--success); }
.banner-error { background: var(--danger-soft); border-left: 4px solid var(--danger); }

/* ---------- Шапка и подвал ---------- */
.site-header {
	position: sticky;
	top: 0;
	z-index: 50;
	backdrop-filter: blur(10px);
	-webkit-backdrop-filter: blur(10px);
	background: color-mix(in srgb, var(--bg) 78%, transparent);
	border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo {
	display: inline-flex;
	align-items: center;
	gap: 10px;
	font-weight: 800;
	font-size: 1.25rem;
	color: var(--text);
}
.logo:hover { text-decoration: none; color: var(--accent); }
.logo-badge {
	width: 28px;
	height: 28px;
	border-radius: 8px;
	background: linear-gradient(135deg, var(--accent), var(--accent-2));
	color: #fff;
	display: inline-flex;
	align-items: center;
	justify-content: center;
	font-weight: 800;
	font-size: 1rem;
}
.header-nav { display: flex; align-items: center; gap: 12px; }
.header-user { color: var(--text-muted); font-weight: 600; }
.inline-form { display: inline; }

.site-footer {
	border-top: 1px solid var(--border);
	padding: 28px 0;
	color: var(--text-muted);
	font-size: .9rem;
	text-align: center;
}
.site-footer p { margin: 0; }

/* ---------- Лендинг ---------- */
.hero {
	position: relative;
	overflow: hidden;
	padding: 88px 0 72px;
	background:
		radial-gradient(620px 420px at 88% -10%, var(--accent-soft), transparent 60%),
		radial-gradient(520px 380px at -10% 110%, var(--accent-soft), transparent 60%);
}
.hero-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 48px; align-items: center; }
.hero-badge {
	display: inline-flex;
	padding: .3rem .9rem;
	border-radius: 999px;
	background: var(--accent-soft);
	color: var(--accent);
	font-weight: 650;
	font-size: .875rem;
}
.hero h1 {
	font-size: clamp(2.2rem, 5vw, 3.4rem);
	line-height: 1.08;
	margin: 18px 0;
	font-weight: 750;
}
.lead { font-size: 1.125rem; color: var(--text-muted); max-width: 34rem; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.hero-facts {
	display: flex;
	gap: 18px;
	flex-wrap: wrap;
	list-style: none;
	padding: 0;
	margin: 26px 0 0;
	color: var(--text-muted);
	font-size: .925rem;
}
.hero-facts li::before { content: "✓ "; color: var(--success); font-weight: 700; }

.hero-visual { position: relative; display: flex; justify-content: center; }
.demo-card {
	display: flex;
	flex-direction: column;
	align-items: center;
	gap: .4rem;
	padding: 2.2rem 2.8rem;
	transform: rotate(-2deg);
}
.demo-ru { font-size: 1.05rem; color: var(--text-muted); }
.demo-arrow { color: var(--accent); font-weight: 700; font-size: 1.2rem; }
.demo-en { font-size: 2.1rem; font-weight: 750; letter-spacing: -0.02em; }
.demo-check {
	margin-top: .7rem;
	background: var(--success-soft);
	color: var(--success);
	padding: .25rem .85rem;
	border-radius: 999px;
	font-size: .85rem;
	font-weight: 600;
}
.chip {
	position: absolute;
	padding: .35rem .95rem;
	border-radius: 999px;
	background: var(--surface);
	border: 1px solid var(--border);
	box-shadow: var(--shadow);
	font-weight: 600;
	color: var(--text-muted);
	animation: float 7s ease-in-out infinite;
}
.chip-1 { top: 4%; left: 4%; }
.chip-2 { top: 66%; left: -2%; animation-delay: 1.4s; }
.chip-3 { top: 8%; right: 2%; animation-delay: 2.6s; }
.chip-4 { bottom: 2%; right: 8%; animation-delay: 3.4s; }
@keyframes float {
	0%, 100% { transform: translateY(0); }
	50% { transform: translateY(-10px); }
}

.features { padding: 72px 0; }
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feature { padding: 28px; }
.feature-icon {
	font-size: 1.6rem;
	width: 52px;
	height: 52px;
	display: flex;
	align-items: center;
	justify-content: center;
	border-radius: 14px;
	background: var(--accent-soft);
	margin-bottom: 14px;
}
.feature p { color: var(--text-muted); margin: 0; }

.how { padding: 72px 0; background: var(--surface-2); }
.how h2 { text-align: center; margin-bottom: 40px; font-size: 1.9rem; }
.steps { list-style: none; margin: 0 auto; max-width: 760px; padding: 0; display: grid; gap: 16px; }
.steps li {
	display: flex;
	gap: 18px;
	padding: 20px 22px;
	background: var(--surface);
	border: 1px solid var(--border);
	border-radius: var(--radius);
	box-shadow: var(--shadow);
}
.steps h3 { margin-top: .15rem; }
.steps p { color: var(--text-muted); margin: 0; }
.step-num {
	flex: none;
	width: 40px;
	height: 40px;
	border-radius: 12px;
	background: linear-gradient(135deg, var(--accent), var(--accent-2));
	color: #fff;
	display: flex;
	align-items: center;
	justify-content: center;
	font-weight: 700;
}

.cta { padding: 72px 0 96px; }
.cta-card {
	text-align: center;
	padding: 56px 32px;
	background:
		radial-gradient(500px 300px at 50% -40%, var(--accent-soft), transparent 70%),
		var(--surface);
}
.cta-card > p { max-width: 40rem; margin-left: auto; margin-right: auto; color: var(--text-muted); }
.cta-contact {
	display: inline-block;
	margin: 14px 0 6px;
	font-size: 1.35rem;
	font-weight: 750;
}
.cta-note { font-size: .925rem; }

/* ---------- Страница входа ---------- */
.auth-page { display: flex; align-items: center; min-height: calc(100vh - 64px); padding: 48px 0; }
.auth-card { max-width: 430px; width: 100%; margin: 0 auto; padding: 44px 40px; text-align: center; }
.auth-emoji { font-size: 2.4rem; }
.auth-card h1 { font-size: 1.7rem; margin: 10px 0 4px; }
.auth-form { display: grid; gap: 12px; margin-top: 26px; text-align: left; }

/* ---------- Рабочее пространство ---------- */
.app-page { padding: 40px 0 72px; }
.page-head {
	display: flex;
	justify-content: space-between;
	align-items: flex-end;
	gap: 16px;
	flex-wrap: wrap;
	margin-bottom: 28px;
}
.page-head p { margin: .3rem 0 0; }

.sets-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 20px; }
.set-card { padding: 22px; display: flex; flex-direction: column; gap: 6px; }
.set-card .muted { margin: 0; font-size: .9rem; }
.set-title a { color: var(--text); font-size: 1.15rem; }
.set-title { margin: 0; }
.set-title a:hover { color: var(--accent); text-decoration: none; }
.set-actions { display: flex; gap: 10px; margin-top: auto; padding-top: 14px; }

.empty-state {
	text-align: center;
	padding: 64px 32px;
	display: grid;
	gap: 12px;
	justify-items: center;
}
.empty-state h2 { margin: 0; }
.empty-emoji { font-size: 2.6rem; }
.empty-state .btn { margin-top: 8px; }

/* ---------- Форма набора ---------- */
.form-wrap { max-width: 880px; }
.set-form { padding: 28px; display: grid; gap: 14px; }
.pairs-label-row {
	display: grid;
	grid-template-columns: 1fr auto 1fr 44px;
	gap: 10px;
	color: var(--text-muted);
	font-size: .8rem;
	font-weight: 700;
	text-transform: uppercase;
	letter-spacing: .05em;
	margin-top: 8px;
}
.pair-rows { display: grid; gap: 10px; counter-reset: pair; }
.pair-row {
	display: grid;
	grid-template-columns: 1fr auto 1fr 44px;
	gap: 10px;
	align-items: center;
	counter-increment: pair;
	position: relative;
}
.pair-row::before {
	content: counter(pair);
	position: absolute;
	left: -30px;
	top: 50%;
	transform: translateY(-50%);
	color: var(--text-muted);
	font-size: .85rem;
	font-weight: 600;
}
.pair-arrow { color: var(--accent); font-weight: 700; }
.btn-remove {
	width: 44px;
	height: 44px;
	border-radius: var(--radius-sm);
	border: 1px solid var(--border);
	background: var(--surface);
	color: var(--text-muted);
	font-size: 1.2rem;
	line-height: 1;
	cursor: pointer;
	transition: color .12s ease, border-color .12s ease, background .12s ease;
}
.btn-remove:hover { color: var(--danger); border-color: var(--danger); background: var(--danger-soft); }
.hint { font-size: .875rem; margin: 0; }
.form-actions { margin-top: 10px; }
.danger-zone { margin-top: 20px; padding: 22px 28px; }
.danger-zone h3 { color: var(--danger); }
.danger-zone .muted { margin: 0 0 12px; }

/* ---------- Изучение ---------- */
.study-wrap { max-width: 660px; }
.study-head { align-items: center; }
.back-link { font-size: .9rem; color: var(--text-muted); }
.study-title { font-size: 1.5rem; margin-top: 2px; }

.seg-toggle {
	display: inline-flex;
	gap: 4px;
	padding: 4px;
	border: 1px solid var(--border);
	border-radius: 999px;
	background: var(--surface);
}
.seg-btn {
	border: none;
	background: transparent;
	padding: .4rem .95rem;
	border-radius: 999px;
	font: inherit;
	font-size: .9rem;
	font-weight: 600;
	color: var(--text-muted);
	cursor: pointer;
	transition: background .12s ease, color .12s ease;
}
.seg-btn[aria-pressed="true"] {
	background: linear-gradient(135deg, var(--accent), var(--accent-2));
	color: #fff;
}

.study-card { margin-top: 6px; padding: 30px 32px 34px; display: grid; gap: 18px; }
.study-progress-row {
	display: flex;
	justify-content: space-between;
	gap: 12px;
	font-size: .9rem;
	flex-wrap: wrap;
}
.progress-track { height: 4px; border-radius: 2px; background: var(--surface-2); overflow: hidden; }
.progress-fill {
	height: 100%;
	width: 0;
	background: linear-gradient(90deg, var(--accent), var(--accent-2));
	transition: width .3s ease;
}
.study-prompt-label { text-align: center; margin: 6px 0 0; text-transform: uppercase; letter-spacing: .06em; font-size: .78rem; font-weight: 700; }
.study-word {
	text-align: center;
	font-size: clamp(2rem, 6vw, 2.6rem);
	font-weight: 700;
	min-height: 3.4rem;
	display: flex;
	align-items: center;
	justify-content: center;
	letter-spacing: -0.01em;
	margin: 0;
}
.study-word-row { display: flex; align-items: center; justify-content: center; gap: 12px; flex-wrap: wrap; }
.speak-btn {
	flex: none;
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 38px;
	height: 38px;
	padding: 0;
	border-radius: 50%;
	border: 1px solid var(--border);
	background: var(--surface-2);
	color: var(--text-muted);
	cursor: pointer;
	transition: color .12s ease, border-color .12s ease;
}
.speak-btn:hover { color: var(--accent); border-color: var(--accent); }
.speak-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.speak-btn svg { width: 18px; height: 18px; }
.speak-btn-sm { width: 28px; height: 28px; }
.speak-btn-sm svg { width: 14px; height: 14px; }
.correct-row { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.answer-form { display: flex; gap: 10px; }
.answer-form input[type="text"] { flex: 1; font-size: 1.05rem; }
#next-btn { margin-top: 2px; }

.interstitial { margin-top: 6px; padding: 56px 32px; text-align: center; }
.interstitial-emoji { font-size: 2.4rem; }
.interstitial h2 { margin: 8px 0 2px; }

.done-card { margin-top: 6px; padding: 40px 32px; text-align: center; display: grid; gap: 18px; justify-items: center; }
.done-emoji { font-size: 3rem; }
.done-card h2 { margin: 0; }
.done-card .muted { margin: 0; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; width: 100%; }
.stat { background: var(--surface-2); border-radius: var(--radius-sm); padding: 14px 8px; display: grid; gap: 2px; }
.stat-num { font-size: 1.5rem; font-weight: 750; }
.stat-label { color: var(--text-muted); font-size: .78rem; }
#hardest-block { width: 100%; }
#hardest-block h3 { margin: 6px 0 4px; }
.hardest-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.hardest-list li { display: flex; justify-content: space-between; gap: 12px; background: var(--surface-2); border-radius: var(--radius-sm); padding: .55rem .9rem; }
.hardest-pair { font-weight: 600; }
.hardest-count { color: var(--danger); font-weight: 700; }
.done-actions { display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; }

/* ---------- Классы ---------- */
.section-title { margin: 26px 0 12px; }
.section-gap { margin-top: 34px; align-items: center; }
.empty-state-sm { padding: 20px 24px; text-align: center; display: grid; gap: 10px; justify-items: center; }
.empty-state-sm .muted { margin: 0; }

.invite-card { padding: 20px 24px; display: grid; gap: 8px; }
.invite-card h3 { margin: 0; }
.invite-card .muted { margin: 0; }
.invite-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-top: 4px; }
.invite-code {
	font-family: ui-monospace, "SF Mono", Consolas, monospace;
	font-size: 1.35rem;
	font-weight: 700;
	letter-spacing: .12em;
	padding: .35rem .8rem;
	border-radius: var(--radius-sm);
	background: var(--surface-2);
	border: 1px dashed var(--border);
	color: var(--text);
}

.member-list { list-style: none; margin: 0; padding: 6px 0; }
.member-row {
	display: flex;
	align-items: center;
	gap: 10px;
	padding: .55rem 1.2rem;
	border-bottom: 1px solid var(--border);
}
.member-row:last-child { border-bottom: none; }
.member-name { font-weight: 600; flex: 1; }
.member-owner .member-name { color: var(--accent); }
.badge {
	font-size: .75rem;
	font-weight: 700;
	padding: .15rem .6rem;
	border-radius: 999px;
	background: var(--accent-soft);
	color: var(--accent);
}

.share-block { border-top: 1px solid var(--border); padding-top: 16px; margin-top: 8px; display: grid; gap: 6px; }
.share-block h3 { margin: 0; }
.share-options { display: flex; gap: 10px 18px; flex-wrap: wrap; margin-top: 6px; }
.share-option {
	display: inline-flex;
	align-items: center;
	gap: 8px;
	font-weight: 500;
	font-size: .95rem;
	margin: 0;
	cursor: pointer;
}
.share-option input { width: auto; accent-color: var(--accent); }

.auth-alt { margin: 14px 0 0; font-size: .92rem; }

/* ---------- Адаптив ---------- */
@media (max-width: 900px) {
	.hero-grid { grid-template-columns: 1fr; gap: 36px; }
	.hero-visual { display: none; }
	.features-grid { grid-template-columns: 1fr; }
	.stats-grid { grid-template-columns: repeat(2, 1fr); }
	.pair-row::before { display: none; }
}

@media (max-width: 640px) {
	.container { padding: 0 16px; }
	.hero { padding: 56px 0 48px; }
	.pairs-label-row, .pair-row { grid-template-columns: 1fr 1fr 44px; }
	.pair-arrow { display: none; }
	.answer-form { flex-direction: column; }
	.study-card { padding: 22px 18px 26px; }
	.header-user { display: none; }
	.page-head { align-items: flex-start; }
}

/* ---------- Движение ---------- */
@media (prefers-reduced-motion: reduce) {
	html { scroll-behavior: auto; }
	.chip { animation: none; }
	.btn:hover { transform: none; }
	.progress-fill { transition: none; }
}