/* ==========================================================================
   Landing v2 — «математический» лендинг (A/B вариант B)
   Загружается только на /?lp=b (шаблон landing/index_v2.html.twig).
   Все селекторы скоупятся под .landing-v2 либо .lv2-* (page-scoped).
   Палитра — через --lv-* переменные (легко заменить).
   Богатые анимации включаются через [data-motion="rich"] на корне,
   переключение в «умеренно» — data-motion="moderate".
   ========================================================================== */

:root {
    --lv-primary:   #2563EB;
    --lv-primary-d: #1D4ED8;
    --lv-accent:    #8B5CF6;
    --lv-accent2:   #F59E0B;
    --lv-bg:        #FAFBFF;
    --lv-bg2:       #EEF3FF;
    --lv-surface:   #FFFFFF;
    --lv-text:      #0F172A;
    --lv-muted:     #566179;
    --lv-border:    rgba(15, 23, 42, .09);
    --lv-shadow:    0 10px 30px -14px rgba(37, 99, 235, .30);
    --lv-shadow-lg: 0 30px 70px -28px rgba(37, 99, 235, .40);
    --lv-grid:      rgba(37, 99, 235, .07);
    --lv-glow:      rgba(139, 92, 246, .20);
    --lv-radius:    20px;
    --lv-radius-sm: 14px;
    --lv-header-h:  70px;
}

/* Отменяем глобальное a:hover{text-decoration:underline} (app.css) —
   у кнопок и ссылок лендинга уже есть своя hover-анимация. */
.lv2-header a:hover,
.landing-v2 a:hover {
    text-decoration: none;
}

[data-dark] {
    --lv-bg:        #0B1020;
    --lv-bg2:       #0E1633;
    --lv-surface:   #141C36;
    --lv-text:      #E8EDF9;
    --lv-muted:     #9AA7C6;
    --lv-border:    rgba(255, 255, 255, .10);
    --lv-shadow:    0 10px 30px -14px rgba(0, 0, 0, .6);
    --lv-shadow-lg: 0 30px 70px -28px rgba(0, 0, 0, .7);
    --lv-grid:      rgba(139, 92, 246, .12);
    --lv-glow:      rgba(139, 92, 246, .28);
}

/* ── Корень ── */
.landing-v2 {
    position: relative;
    z-index: 0;
    background: var(--lv-bg);
    color: var(--lv-text);
    font-family: var(--font, 'Inter', system-ui, sans-serif);
    overflow-x: clip;
}
.landing-v2 > *:not(.lv2-bg) { position: relative; z-index: 1; }
.landing-v2 h1, .landing-v2 h2, .landing-v2 h3 { line-height: 1.12; letter-spacing: -0.02em; }

html { scroll-behavior: smooth; }
.landing-v2 [id] { scroll-margin-top: calc(var(--lv-header-h) + 16px); }

/* Общий контейнер секций */
.lv2-section {
    max-width: 1160px;
    margin: 0 auto;
    padding: clamp(3.5rem, 8vw, 6rem) 1.5rem;
}
/* Компактные секции для тонких SEO-страниц (много секций подряд, не все содержательные) */
.lv2-section--compact {
    padding: clamp(2rem, 4vw, 3rem) 1.5rem;
}
.lv2-grad {
    background: linear-gradient(100deg, var(--lv-primary), var(--lv-accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

/* ==========================================================================
   Header
   ========================================================================== */
.lv2-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: color-mix(in srgb, var(--lv-surface) 82%, transparent);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--lv-border);
}
.lv2-header__inner {
    max-width: 1160px;
    margin: 0 auto;
    height: var(--lv-header-h);
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}
.lv2-logo {
    display: inline-flex;
    align-items: center;
    gap: .55rem;
    text-decoration: none;
    color: var(--lv-text);
    font-weight: 800;
    font-size: 1.25rem;
}
.lv2-logo__img {
    height: 46px;
    width: auto;
    display: block;
}
.lv2-logo__text {
    font-size: 1.35rem;
    font-weight: 800;
    letter-spacing: .02em;
    background: linear-gradient(100deg, var(--lv-primary), var(--lv-accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}
.lv2-nav {
    display: flex;
    align-items: center;
    gap: 1.6rem;
}
.lv2-nav__link {
    color: var(--lv-muted);
    text-decoration: none;
    font-size: .95rem;
    font-weight: 500;
    transition: color .2s;
}
.lv2-nav__link:hover { color: var(--lv-primary); }
.lv2-nav__login {
    color: var(--lv-text);
    text-decoration: none;
    font-weight: 600;
    font-size: .95rem;
}
.lv2-nav__login:hover { color: var(--lv-primary); }

.lv2-burger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 44px; height: 44px;
    padding: 0 10px;
    background: none;
    border: 1px solid var(--lv-border);
    border-radius: 12px;
    cursor: pointer;
}
.lv2-burger span {
    height: 2px;
    background: var(--lv-text);
    border-radius: 2px;
    transition: transform .25s, opacity .25s;
}
.lv2-burger.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.lv2-burger.is-open span:nth-child(2) { opacity: 0; }
.lv2-burger.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ==========================================================================
   Buttons
   ========================================================================== */
.lv2-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .4rem;
    padding: .7rem 1.3rem;
    border-radius: 999px;
    font-weight: 600;
    font-size: .95rem;
    text-decoration: none;
    border: 1.5px solid transparent;
    cursor: pointer;
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease, color .2s ease;
    white-space: nowrap;
}
.lv2-btn--sm { padding: .5rem 1rem; font-size: .9rem; }
.lv2-btn--lg { padding: .95rem 1.8rem; font-size: 1.05rem; }
.lv2-btn--block { display: flex; width: 100%; }

.lv2-btn--primary {
    color: #fff;
    background: linear-gradient(100deg, var(--lv-primary), var(--lv-accent));
    box-shadow: var(--lv-shadow);
}
.lv2-btn--primary:hover { transform: translateY(-2px); box-shadow: var(--lv-shadow-lg); }
.lv2-btn--ghost {
    color: var(--lv-text);
    border-color: var(--lv-border);
    background: var(--lv-surface);
}
.lv2-btn--ghost:hover { transform: translateY(-2px); border-color: var(--lv-primary); color: var(--lv-primary); }
.lv2-btn--outline {
    color: var(--lv-primary);
    border-color: color-mix(in srgb, var(--lv-primary) 40%, transparent);
    background: transparent;
}
.lv2-btn--outline:hover { background: color-mix(in srgb, var(--lv-primary) 8%, transparent); transform: translateY(-2px); }
.lv2-btn--white { color: var(--lv-primary); background: #fff; }
.lv2-btn--white:hover { transform: translateY(-2px); box-shadow: 0 16px 40px -16px rgba(0,0,0,.5); }
.lv2-btn--ghost-white { color: #fff; border-color: rgba(255,255,255,.55); }
.lv2-btn--ghost-white:hover { background: rgba(255,255,255,.14); transform: translateY(-2px); }

/* ==========================================================================
   Decorative math background
   ========================================================================== */
.lv2-bg {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}
.lv2-bg__grid { position: absolute; inset: 0; color: var(--lv-grid); }
.lv2-bg::after { /* мягкое свечение сверху */
    content: "";
    position: absolute;
    top: -20%; left: 50%;
    width: 900px; height: 600px;
    transform: translateX(-50%);
    background: radial-gradient(ellipse at center, var(--lv-glow), transparent 70%);
    opacity: .8;
}
.lv2-shape {
    position: absolute;
    display: block;
    opacity: .5;
}
.lv2-shape--circle {
    top: 16%; left: 7%;
    width: 90px; height: 90px;
    border-radius: 50%;
    border: 2px solid color-mix(in srgb, var(--lv-primary) 45%, transparent);
}
.lv2-shape--ring {
    top: 62%; left: 12%;
    width: 54px; height: 54px;
    border-radius: 50%;
    border: 6px solid color-mix(in srgb, var(--lv-accent) 35%, transparent);
}
.lv2-shape--square {
    top: 30%; right: 8%;
    width: 60px; height: 60px;
    border-radius: 12px;
    border: 2px solid color-mix(in srgb, var(--lv-accent2) 55%, transparent);
    transform: rotate(18deg);
}
.lv2-shape--triangle {
    top: 74%; right: 10%;
    width: 0; height: 0;
    border-left: 34px solid transparent;
    border-right: 34px solid transparent;
    border-bottom: 58px solid color-mix(in srgb, var(--lv-primary) 22%, transparent);
    opacity: .35;
}
.lv2-formula {
    position: absolute;
    font-family: 'Cambria Math', Georgia, serif;
    font-size: clamp(1rem, 2vw, 1.6rem);
    font-style: italic;
    color: color-mix(in srgb, var(--lv-primary) 30%, transparent);
    opacity: .55;
    user-select: none;
}
.lv2-formula--1 { top: 22%; right: 22%; }
.lv2-formula--2 { top: 50%; left: 4%; }
.lv2-formula--3 { top: 82%; left: 40%; }
.lv2-formula--4 { top: 40%; right: 5%; color: color-mix(in srgb, var(--lv-accent) 35%, transparent); }

/* Вариант 2 — фигуры зеркалом, тёплый акцент (accent2) */
.lv2-bg--variant-2 .lv2-shape--circle   { top: 20%; right: 9%; left: auto; }
.lv2-bg--variant-2 .lv2-shape--ring     { top: 66%; right: 14%; left: auto; }
.lv2-bg--variant-2 .lv2-shape--square   { top: 26%; left: 8%; right: auto; }
.lv2-bg--variant-2 .lv2-shape--triangle { top: 70%; left: 11%; right: auto; }
.lv2-bg--variant-2 .lv2-formula--1 { top: 26%; left: 20%; right: auto; }
.lv2-bg--variant-2 .lv2-formula--2 { top: 54%; right: 6%; left: auto; }
.lv2-bg--variant-2 .lv2-formula--3 { top: 78%; right: 36%; left: auto; }
.lv2-bg--variant-2 .lv2-formula--4 { top: 44%; left: 6%; right: auto; color: color-mix(in srgb, var(--lv-accent2) 40%, transparent); }
.lv2-bg--variant-2::after { background: radial-gradient(ellipse at center, color-mix(in srgb, var(--lv-accent2) 55%, var(--lv-glow)), transparent 70%); }

/* Вариант 3 — фигуры ниже/компактнее, холодный акцент (primary) */
.lv2-bg--variant-3 .lv2-shape--circle   { top: 10%; left: 40%; }
.lv2-bg--variant-3 .lv2-shape--ring     { top: 50%; right: 6%; left: auto; }
.lv2-bg--variant-3 .lv2-shape--square   { top: 68%; right: 30%; }
.lv2-bg--variant-3 .lv2-shape--triangle { top: 20%; right: 34%; }
.lv2-bg--variant-3 .lv2-formula--1 { top: 16%; left: 10%; right: auto; }
.lv2-bg--variant-3 .lv2-formula--2 { top: 60%; left: 30%; }
.lv2-bg--variant-3 .lv2-formula--3 { top: 88%; right: 12%; left: auto; }
.lv2-bg--variant-3 .lv2-formula--4 { top: 34%; right: 26%; left: auto; color: color-mix(in srgb, var(--lv-primary) 45%, transparent); }
.lv2-bg--variant-3::after { top: -10%; left: 30%; width: 700px; height: 700px; }

/* ==========================================================================
   Hero
   ========================================================================== */
.lv2-hero {
    max-width: 1160px;
    margin: 0 auto;
    padding: clamp(2.5rem, 6vw, 5rem) 1.5rem clamp(2rem, 5vw, 3.5rem);
    display: grid;
    grid-template-columns: 1.05fr .95fr;
    gap: clamp(2rem, 5vw, 4rem);
    align-items: center;
}
.lv2-eyebrow {
    display: inline-block;
    padding: .4rem .9rem;
    border-radius: 999px;
    font-size: .85rem;
    font-weight: 600;
    color: var(--lv-primary);
    background: color-mix(in srgb, var(--lv-primary) 10%, transparent);
    border: 1px solid color-mix(in srgb, var(--lv-primary) 22%, transparent);
    margin-bottom: 1.2rem;
}
.lv2-hero__title {
    font-size: clamp(2.2rem, 5.5vw, 3.8rem);
    font-weight: 800;
    margin-bottom: 1.1rem;
}
.lv2-hero__sub {
    font-size: clamp(1.02rem, 1.6vw, 1.2rem);
    color: var(--lv-muted);
    max-width: 34em;
    margin-bottom: 1.8rem;
}
.lv2-hero__actions { display: flex; flex-wrap: wrap; gap: .9rem; margin-bottom: 1.2rem; }
.lv2-hero__note { color: var(--lv-muted); font-size: .9rem; }

/* Вариант hero без визуальной колонки (SEO-страницы: только текст, без иллюстрации) */
.lv2-hero--simple {
    grid-template-columns: 1fr;
    padding-bottom: clamp(1.5rem, 3vw, 2.5rem);
}
.lv2-hero--simple .lv2-hero__title,
.lv2-hero--simple .lv2-hero__sub { max-width: 46em; }

/* Hero visual */
.lv2-hero__visual { position: relative; }
.lv2-plot {
    background: var(--lv-surface);
    border: 1px solid var(--lv-border);
    border-radius: var(--lv-radius);
    box-shadow: var(--lv-shadow-lg);
    padding: 1.4rem;
    transform: rotate(-2deg);
}
.lv2-plot__svg { display: block; width: 100%; height: auto; }
.lv2-plot__axis { stroke: color-mix(in srgb, var(--lv-muted) 45%, transparent); stroke-width: 1.5; }
.lv2-plot__sine {
    stroke: var(--lv-primary);
    stroke-width: 3.5;
    stroke-linecap: round;
    stroke-dasharray: 620;
    stroke-dashoffset: 620;
    animation: lv2-draw 2.2s ease forwards .3s;
}
.lv2-plot__parabola {
    stroke: var(--lv-accent);
    stroke-width: 3;
    stroke-linecap: round;
    stroke-dasharray: 6 8;
    opacity: .8;
}
.lv2-plot__dot { fill: var(--lv-primary); }
.lv2-plot__dot--accent { fill: var(--lv-accent2); }

.lv2-chip {
    position: absolute;
    padding: .55rem .9rem;
    border-radius: 14px;
    background: var(--lv-surface);
    border: 1px solid var(--lv-border);
    box-shadow: var(--lv-shadow);
    font-weight: 700;
    font-size: .9rem;
}
.lv2-chip--xp     { top: -14px; right: 6%; color: var(--lv-accent); }
.lv2-chip--streak { bottom: 8%; left: -10px; color: var(--lv-accent2); }
.lv2-chip--task   { bottom: -14px; right: 12%; color: var(--lv-primary); }

/* ==========================================================================
   Section head
   ========================================================================== */
.lv2-section__head { text-align: center; max-width: 640px; margin: 0 auto clamp(2rem, 4vw, 3rem); }
.lv2-kicker {
    display: inline-block;
    text-transform: uppercase;
    letter-spacing: .12em;
    font-size: .78rem;
    font-weight: 700;
    color: var(--lv-accent);
    margin-bottom: .7rem;
}
.lv2-section__head h2 { font-size: clamp(1.7rem, 3.5vw, 2.6rem); font-weight: 800; margin-bottom: .7rem; }
.lv2-section__head p { color: var(--lv-muted); font-size: 1.05rem; }

/* ==========================================================================
   Bento features
   ========================================================================== */
.lv2-bento {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.2rem;
}
.lv2-card {
    background: var(--lv-surface);
    border: 1px solid var(--lv-border);
    border-radius: var(--lv-radius);
    padding: 1.7rem;
    box-shadow: var(--lv-shadow);
    transition: transform .25s ease, box-shadow .25s ease;
}
.lv2-card:hover { transform: translateY(-4px); box-shadow: var(--lv-shadow-lg); }
.lv2-card--wide { grid-column: span 2; }
.lv2-card--primary { background: linear-gradient(135deg, color-mix(in srgb, var(--lv-primary) 10%, var(--lv-surface)), var(--lv-surface)); }
.lv2-card--accent  { background: linear-gradient(135deg, color-mix(in srgb, var(--lv-accent) 12%, var(--lv-surface)), var(--lv-surface)); }
.lv2-card__icon {
    display: grid;
    place-items: center;
    width: 52px; height: 52px;
    border-radius: 14px;
    font-size: 1.6rem;
    margin-bottom: 1rem;
    background: color-mix(in srgb, var(--lv-primary) 10%, transparent);
}
.lv2-card h3 { font-size: 1.2rem; margin-bottom: .5rem; }
.lv2-card p { color: var(--lv-muted); font-size: .97rem; }

/* ==========================================================================
   Steps
   ========================================================================== */
.lv2-steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.lv2-step {
    background: var(--lv-surface);
    border: 1px solid var(--lv-border);
    border-radius: var(--lv-radius);
    padding: 2rem 1.6rem;
    box-shadow: var(--lv-shadow);
}
.lv2-step__num {
    display: grid;
    place-items: center;
    width: 48px; height: 48px;
    border-radius: 14px;
    color: #fff;
    font-weight: 800;
    font-size: 1.3rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--lv-primary), var(--lv-accent));
}
.lv2-step h3 { font-size: 1.2rem; margin-bottom: .5rem; }
.lv2-step p { color: var(--lv-muted); font-size: .97rem; }

/* ==========================================================================
   Pricing
   ========================================================================== */
.lv2-tiers {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.4rem;
    align-items: start;
}
.lv2-tier {
    position: relative;
    background: var(--lv-surface);
    border: 1px solid var(--lv-border);
    border-radius: var(--lv-radius);
    padding: 2rem 1.7rem;
    box-shadow: var(--lv-shadow);
    display: flex;
    flex-direction: column;
}
.lv2-tier--popular {
    border-color: transparent;
    box-shadow: var(--lv-shadow-lg);
    background:
        linear-gradient(var(--lv-surface), var(--lv-surface)) padding-box,
        linear-gradient(135deg, var(--lv-primary), var(--lv-accent)) border-box;
    border: 2px solid transparent;
}
.lv2-tier__badge {
    position: absolute;
    top: -13px; left: 50%;
    transform: translateX(-50%);
    padding: .3rem .9rem;
    border-radius: 999px;
    font-size: .78rem;
    font-weight: 700;
    color: #fff;
    background: linear-gradient(100deg, var(--lv-primary), var(--lv-accent));
    box-shadow: var(--lv-shadow);
}
.lv2-tier__name { font-size: 1.3rem; margin-bottom: 1rem; }
.lv2-tier__price { margin-bottom: 1.3rem; }
.lv2-tier__amount { font-size: 2rem; font-weight: 800; }
.lv2-tier__period { color: var(--lv-muted); font-size: .95rem; }
.lv2-tier__yearly { margin-top: .35rem; font-size: .85rem; color: var(--lv-muted); }
.lv2-tier__save {
    display: inline-block;
    margin-left: .3rem;
    padding: .05rem .4rem;
    border-radius: 6px;
    font-weight: 700;
    color: var(--lv-accent2);
    background: color-mix(in srgb, var(--lv-accent2) 15%, transparent);
}
.lv2-tier__features { list-style: none; padding: 0; margin: 0 0 1.5rem; display: grid; gap: .55rem; flex: 1; }
.lv2-tier__features li { font-size: .95rem; color: var(--lv-text); }

/* ==========================================================================
   Grades
   ========================================================================== */
.lv2-grades { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.4rem; }
.lv2-grade {
    background: var(--lv-surface);
    border: 1px solid var(--lv-border);
    border-radius: var(--lv-radius);
    padding: 1.8rem;
    box-shadow: var(--lv-shadow);
}
.lv2-grade__label {
    display: inline-block;
    font-weight: 800;
    font-size: 1.15rem;
    margin-bottom: .6rem;
    background: linear-gradient(100deg, var(--lv-primary), var(--lv-accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}
.lv2-grade p { color: var(--lv-muted); font-size: .97rem; }

/* ==========================================================================
   Reviews
   ========================================================================== */
.lv2-reviews { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.4rem; }
.lv2-review {
    background: var(--lv-surface);
    border: 1px solid var(--lv-border);
    border-radius: var(--lv-radius);
    padding: 1.8rem;
    box-shadow: var(--lv-shadow);
    margin: 0;
}
.lv2-review__stars { color: var(--lv-accent2); letter-spacing: .1em; margin-bottom: .8rem; }
.lv2-review blockquote { margin: 0 0 1rem; font-size: 1rem; }
.lv2-review figcaption { color: var(--lv-muted); font-size: .88rem; font-weight: 600; }

/* ==========================================================================
   FAQ
   ========================================================================== */
.lv2-faq__list { max-width: 780px; margin: 0 auto; display: grid; gap: .8rem; }
.lv2-faq-item {
    background: var(--lv-surface);
    border: 1px solid var(--lv-border);
    border-radius: var(--lv-radius-sm);
    padding: .3rem 1.3rem;
    box-shadow: var(--lv-shadow);
}
.lv2-faq-item summary {
    list-style: none;
    cursor: pointer;
    padding: 1rem 2rem 1rem 0;
    font-weight: 600;
    position: relative;
}
.lv2-faq-item summary::-webkit-details-marker { display: none; }
.lv2-faq-item summary::after {
    content: "+";
    position: absolute;
    right: 0; top: 50%;
    transform: translateY(-50%);
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--lv-primary);
    transition: transform .2s;
}
.lv2-faq-item[open] summary::after { transform: translateY(-50%) rotate(45deg); }
.lv2-faq-item p { color: var(--lv-muted); padding-bottom: 1rem; }

/* ==========================================================================
   Final CTA
   ========================================================================== */
.lv2-cta {
    max-width: 1160px;
    margin: 0 auto clamp(3rem, 6vw, 5rem);
    padding: 0 1.5rem;
}
.lv2-cta__inner {
    border-radius: 28px;
    padding: clamp(2.5rem, 6vw, 4rem) 1.5rem;
    text-align: center;
    color: #fff;
    background: linear-gradient(120deg, var(--lv-primary), var(--lv-accent) 60%, var(--lv-accent2));
    background-size: 200% 200%;
    box-shadow: var(--lv-shadow-lg);
}
.lv2-cta__inner h2 { font-size: clamp(1.7rem, 4vw, 2.6rem); font-weight: 800; margin-bottom: .8rem; }
.lv2-cta__inner p { font-size: 1.1rem; opacity: .92; margin-bottom: 1.8rem; }
.lv2-cta__actions { display: flex; flex-wrap: wrap; gap: .9rem; justify-content: center; }

/* ==========================================================================
   Stats
   ========================================================================== */
.lv2-stats {
    max-width: 1000px;
    margin: 0 auto;
    padding: 1rem 1.5rem 2rem;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
}
.lv2-stat {
    text-align: center;
    padding: 1.4rem 1rem;
    background: var(--lv-surface);
    border: 1px solid var(--lv-border);
    border-radius: var(--lv-radius-sm);
    box-shadow: var(--lv-shadow);
}
.lv2-stat__num {
    font-size: clamp(1.5rem, 3vw, 2.1rem);
    font-weight: 800;
    background: linear-gradient(100deg, var(--lv-primary), var(--lv-accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}
.lv2-stat__label { color: var(--lv-muted); font-size: .85rem; margin-top: .3rem; }

/* ==========================================================================
   Rich animations — включаются только при data-motion="rich"
   ========================================================================== */
@keyframes lv2-draw { to { stroke-dashoffset: 0; } }
@keyframes lv2-float {
    0%, 100% { transform: translateY(0) rotate(var(--r, 0deg)); }
    50%      { transform: translateY(-22px) rotate(var(--r, 0deg)); }
}
@keyframes lv2-float-chip {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(-10px); }
}
@keyframes lv2-gradient-move {
    0%   { background-position: 0% 50%; }
    100% { background-position: 200% 50%; }
}

.landing-v2[data-motion="rich"] .lv2-shape,
.landing-v2[data-motion="rich"] .lv2-formula {
    animation: lv2-float 9s ease-in-out infinite;
}
.landing-v2[data-motion="rich"] .lv2-shape--ring   { animation-duration: 11s; --r: 0deg; }
.landing-v2[data-motion="rich"] .lv2-shape--square  { animation-duration: 12s; --r: 18deg; }
.landing-v2[data-motion="rich"] .lv2-shape--triangle{ animation-duration: 10s; }
.landing-v2[data-motion="rich"] .lv2-formula--2 { animation-duration: 13s; }
.landing-v2[data-motion="rich"] .lv2-formula--3 { animation-duration: 12s; }

.landing-v2[data-motion="rich"] .lv2-chip { animation: lv2-float-chip 4.5s ease-in-out infinite; }
.landing-v2[data-motion="rich"] .lv2-chip--streak { animation-duration: 5.5s; animation-delay: .4s; }
.landing-v2[data-motion="rich"] .lv2-chip--task { animation-duration: 5s; animation-delay: .8s; }

.landing-v2[data-motion="rich"] .lv2-cta__inner {
    animation: lv2-gradient-move 8s linear infinite alternate;
}

/* В «умеренном» режиме график не рисуется анимацией, а показан сразу */
.landing-v2[data-motion="moderate"] .lv2-plot__sine {
    animation: none;
    stroke-dashoffset: 0;
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 900px) {
    .lv2-hero { grid-template-columns: 1fr; text-align: center; }
    .lv2-hero__sub { margin-left: auto; margin-right: auto; }
    .lv2-hero__actions { justify-content: center; }
    .lv2-hero__visual { max-width: 420px; margin: 0 auto; }
    .lv2-bento { grid-template-columns: repeat(2, 1fr); }
    .lv2-card--wide { grid-column: span 2; }
    .lv2-steps, .lv2-tiers, .lv2-grades, .lv2-reviews { grid-template-columns: 1fr; }
    .lv2-stats { grid-template-columns: repeat(2, 1fr); }

    /* Мобильное меню */
    .lv2-burger { display: flex; }
    .lv2-nav {
        position: absolute;
        top: var(--lv-header-h);
        left: 0; right: 0;
        flex-direction: column;
        align-items: stretch;
        gap: .4rem;
        padding: 1rem 1.5rem 1.5rem;
        background: var(--lv-surface);
        border-bottom: 1px solid var(--lv-border);
        box-shadow: var(--lv-shadow-lg);
        transform: translateY(-12px);
        opacity: 0;
        pointer-events: none;
        transition: opacity .2s, transform .2s;
    }
    .lv2-nav.is-open { transform: translateY(0); opacity: 1; pointer-events: auto; }
    .lv2-nav__link, .lv2-nav__login { padding: .6rem 0; font-size: 1.05rem; }
    .lv2-btn--sm { width: 100%; margin-top: .4rem; }
}

@media (max-width: 480px) {
    .lv2-bento { grid-template-columns: 1fr; }
    .lv2-card--wide { grid-column: span 1; }
    .lv2-stats { grid-template-columns: 1fr; }
    .lv2-hero__actions .lv2-btn { width: 100%; }
}

/* ==========================================================================
   Reduced motion — уважаем системную настройку
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .landing-v2 *, .lv2-header * { animation: none !important; transition: none !important; }
    .landing-v2 .animate-hidden { opacity: 1 !important; transform: none !important; }
    .landing-v2 .lv2-plot__sine { stroke-dashoffset: 0 !important; }
}

/* ==========================================================================
   SEO landing pages — breadcrumbs, body content, demo widget
   ========================================================================== */
.seo-breadcrumbs {
    display: block;
    margin-bottom: 1rem;
    font-size: .9rem;
    color: var(--lv-muted);
}
.seo-breadcrumbs a { color: var(--lv-muted); text-decoration: underline; }
.seo-breadcrumbs a:hover { color: var(--lv-primary); }

.seo-body { max-width: 760px; margin: 0 auto; line-height: 1.7; }
.seo-body h2 { margin-top: 2rem; font-size: 1.4rem; }
.seo-body h3 { margin-top: 1.4rem; font-size: 1.15rem; }
.seo-body p { margin: .9rem 0; color: var(--lv-text); }
.seo-body ul { margin: .9rem 0; padding-left: 1.4rem; }
.seo-body li { margin: .4rem 0; }

.seo-demo { position: relative; max-width: 640px; margin: 0 auto; text-align: left; }
.seo-demo__question { font-size: 1.15rem; font-weight: 600; margin: .8rem 2rem 1.2rem 0; }
.seo-demo__form { display: flex; gap: .6rem; flex-wrap: wrap; }
.seo-demo__input {
    flex: 1 1 200px;
    padding: .7rem 1rem;
    border: 1px solid var(--lv-border);
    border-radius: var(--lv-radius);
    background: var(--lv-surface);
    color: var(--lv-text);
    font-size: 1rem;
}
.seo-demo__result { margin-top: .8rem; font-weight: 600; }
.seo-demo__result[data-correct="true"] { color: #16a34a; }
.seo-demo__result[data-correct="false"] { color: #dc2626; }
.seo-demo__cta { margin-top: 1.4rem; }

/* Кнопка «Следующая задача» — в угол карточки, подальше от «Проверить»,
   чтобы не было случайных кликов вместо проверки ответа. */
.seo-demo__next {
    position: absolute;
    top: 1.1rem;
    right: 1.1rem;
    padding: .4rem .9rem;
    font-size: .85rem;
}
.seo-demo h3 { padding-right: 8rem; }
@media (max-width: 480px) {
    .seo-demo h3 { padding-right: 0; }
    .seo-demo__next { position: static; display: block; margin: .8rem 0 0; }
}

/* ==========================================================================
   Auth pages (login/register) на фоне варианта B.
   .public-zone:has(.landing) обнуляет flex-центрирование .public-container
   для лендинга, поэтому позиционирование карточки задаётся здесь.
   Якорим карточку сверху (фиксированный отступ от лого), а не по центру
   вьюпорта: реальная "шапка" на этих страницах — .login-hero (~212px),
   а не .lv2-header (70px), поэтому центрирование по 100vh-70px давало
   разный визуальный результат для короткой (логин) и длинной (регистрация)
   формы — короткая уезжала вниз экрана.
   ========================================================================== */
.lv2-auth-wrap {
    display: flex;
    justify-content: center;
    padding: 1rem 1.5rem 4rem;
}