/* ========== FX-плейграунд (play.html) ==========
   Только эта страница: фон всегда тёмный, полноэкранный canvas под всем. */

body.fx-page {
    background: #05070d;
}

#fx-bg {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

.fx-fallback {
    position: fixed;
    inset: 0;
    z-index: 0;
    display: grid;
    place-items: center;
    background: radial-gradient(60% 60% at 50% 40%, #101a2c 0%, #05070d 100%);
}
.fx-fallback p {
    color: var(--secondary);
    font-family: var(--mono);
    font-size: 0.9rem;
    padding: 0 24px;
    text-align: center;
}
/* display:grid выше перебивает [hidden] из UA-стилей — глушим явно */
.fx-fallback[hidden] { display: none; }

.fx-main {
    position: relative;
    z-index: 1;
    min-height: calc(100vh - var(--header-h));
}

/* ---------- Шапка: название фона ---------- */

.fx-hero {
    min-height: 44vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 48px 0 28px;
}

.fx-kicker {
    font-family: var(--mono);
    font-size: 0.8rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: 14px;
}

.fx-title {
    font-family: var(--display);
    font-weight: 500;
    font-size: clamp(1.9rem, 5.5vw, 3.8rem);
    line-height: 1.12;
    letter-spacing: -0.01em;
}

.fx-title .fx-title-em {
    display: inline-block;
    min-width: 10ch;
    background: linear-gradient(90deg, #7df9c9 0%, #4d9dff 55%, #c07dff 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.fx-sub {
    margin-top: 14px;
    max-width: 46ch;
    color: var(--secondary);
}
.fx-sub kbd {
    font-family: var(--mono);
    font-size: 0.82em;
    background: var(--raised);
    border: 1px solid var(--hairline-strong);
    border-radius: 6px;
    padding: 1px 7px;
}

/* ---------- Карточки шейдеров ---------- */

.fx-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
    gap: 16px;
    padding-bottom: 56px;
}

.fx-card {
    position: relative;
    padding: 20px 20px 22px;
    border-radius: var(--r-md);
    background: var(--glass);
    border: 1px solid var(--glass-edge);
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
    box-shadow: var(--card-shadow);
    cursor: pointer;
    transform-style: preserve-3d;
    transition:
        transform 0.35s var(--ease),
        border-color 0.25s var(--ease),
        box-shadow 0.35s var(--ease);
}
.fx-card:hover {
    border-color: var(--glass-edge-hover);
    box-shadow: var(--card-lift);
}
.fx-card:active { transition-duration: 0.05s; }

.fx-card.is-active {
    border-color: var(--glass-glow);
    box-shadow:
        var(--card-lift),
        inset 0 0 0 1px var(--glass-glow);
}

.fx-card-num {
    font-family: var(--mono);
    font-size: 0.72rem;
    color: var(--muted);
    letter-spacing: 0.14em;
}

.fx-card h3 {
    font-family: var(--display);
    font-weight: 500;
    font-size: 1.12rem;
    margin: 10px 0 6px;
}

.fx-card p {
    color: var(--secondary);
    font-size: 0.9rem;
    line-height: 1.5;
}

.fx-card-state {
    position: absolute;
    top: 16px;
    right: 16px;
    font-family: var(--mono);
    font-size: 0.66rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--cd-text);
    background: var(--cd-bg);
    border: 1px solid var(--cd-edge);
    border-radius: 999px;
    padding: 3px 10px;
    opacity: 0;
    transition: opacity 0.25s var(--ease);
}
.fx-card.is-active .fx-card-state { opacity: 1; }

/* ---------- Бегущая строка ---------- */

.fx-marquee {
    position: relative;
    z-index: 1;
    overflow: hidden;
    border-top: 1px solid var(--hairline);
    padding: 14px 0;
    -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
    mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
}

.fx-marquee-track {
    display: flex;
    gap: 0;
    width: max-content;
    animation: fx-marquee 30s linear infinite;
}

.fx-marquee-track span {
    display: block;
    white-space: nowrap;
    font-family: var(--mono);
    font-size: 0.78rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--muted);
    padding-right: 48px;
}

@keyframes fx-marquee {
    to { transform: translateX(-50%); }
}

@media (max-width: 560px) {
    .fx-hero { padding-top: 28px; min-height: 34vh; }
    .fx-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
    .fx-card { padding: 16px 14px 18px; }
    .fx-card p { display: none; }
}

@media (prefers-reduced-motion: reduce) {
    .fx-marquee-track { animation: none; }
}

/* ---------- Горизонтальная галерея (sticky-скролл, demo #9) ---------- */

.fx-hscroll {
    height: 260vh;
    overflow-x: clip;
}

.fx-hs-sticky {
    position: sticky;
    top: 0;
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 28px;
}

.fx-hs-kicker {
    font-family: var(--mono);
    font-size: 0.8rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--muted);
    margin: 0 0 10px;
}

.fx-hs-title {
    font-family: var(--display);
    font-weight: 500;
    font-size: clamp(1.4rem, 3vw, 2.2rem);
    margin: 0 0 8px;
}

.fx-hs-hint {
    font-family: var(--mono);
    font-size: 0.75rem;
    letter-spacing: 0.12em;
    color: var(--muted);
    margin: 0;
}

.fx-hs-strip {
    display: flex;
    gap: 20px;
    width: max-content;
    padding: 8px 4vw;
    will-change: transform;
}

.fx-hs-tile {
    position: relative;
    flex: 0 0 auto;
    width: min(340px, 64vw);
    aspect-ratio: 16 / 10;
    border-radius: var(--r-md);
    overflow: hidden;
    border: 1px solid var(--glass-edge);
    box-shadow: var(--card-shadow);
}

.fx-hs-tile:nth-child(1) { background-image: repeating-linear-gradient(115deg, rgba(255,255,255,0.035) 0 2px, transparent 2px 7px), linear-gradient(135deg, #0b1e3a 0%, #123a6b 45%, #2b6fb3 100%); }
.fx-hs-tile:nth-child(2) { background-image: repeating-linear-gradient(115deg, rgba(255,255,255,0.035) 0 2px, transparent 2px 7px), linear-gradient(135deg, #1a0b2e 0%, #3c1663 55%, #7a3bd6 100%); }
.fx-hs-tile:nth-child(3) { background-image: repeating-linear-gradient(115deg, rgba(255,255,255,0.035) 0 2px, transparent 2px 7px), linear-gradient(135deg, #04211d 0%, #0c4f3f 55%, #2fae7f 100%); }
.fx-hs-tile:nth-child(4) { background-image: repeating-linear-gradient(115deg, rgba(255,255,255,0.035) 0 2px, transparent 2px 7px), linear-gradient(135deg, #101426 0%, #232a54 55%, #4d5fb3 100%); }
.fx-hs-tile:nth-child(5) { background-image: repeating-linear-gradient(115deg, rgba(255,255,255,0.035) 0 2px, transparent 2px 7px), linear-gradient(135deg, #2e0f24 0%, #5a1e47 55%, #a03c7e 100%); }
.fx-hs-tile:nth-child(6) { background-image: repeating-linear-gradient(115deg, rgba(255,255,255,0.035) 0 2px, transparent 2px 7px), linear-gradient(135deg, #0d1420 0%, #1f3a4f 55%, #3e6f8e 100%); }
.fx-hs-tile:nth-child(7) { background-image: repeating-linear-gradient(115deg, rgba(255,255,255,0.035) 0 2px, transparent 2px 7px), linear-gradient(135deg, #241a06 0%, #5a4210 55%, #9e7a1f 100%); }
.fx-hs-tile:nth-child(8) { background-image: repeating-linear-gradient(115deg, rgba(255,255,255,0.035) 0 2px, transparent 2px 7px), linear-gradient(135deg, #0a1020 0%, #16264d 55%, #2e4a8e 100%); }

.fx-hs-cap {
    position: absolute;
    left: 14px;
    bottom: 12px;
    font-family: var(--mono);
    font-size: 0.72rem;
    letter-spacing: 0.14em;
    color: #e8ecf7;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.6);
}

@media (prefers-reduced-motion: reduce) {
    .fx-hscroll { height: auto; overflow-x: visible; }
    .fx-hs-sticky { position: static; height: auto; overflow-x: auto; }
    .fx-hs-strip { will-change: auto; }
}

@media (max-width: 640px) {
    .fx-hs-tile { width: min(240px, 72vw); }
    .fx-hs-strip { gap: 12px; }
}