:root {
    color-scheme: dark;
    --bg: #05070d;
    --ink: #f4f7ff;
    --muted: rgba(231, 237, 255, 0.64);
    --faint: rgba(231, 237, 255, 0.4);
    --line: rgba(255, 255, 255, 0.14);
    --accent: #74f3ce;
    --accent-rgb: 116, 243, 206;
    --ease: cubic-bezier(0.22, 0.9, 0.3, 1);
}

* { box-sizing: border-box; }

html,
body {
    width: 100%;
    min-width: 320px;
    min-height: 100%;
    margin: 0;
    background: var(--bg);
}

body {
    overflow: hidden;
    color: var(--ink);
    font-family: "Inter", "SF Pro Display", "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

body[data-effect="sdf-ray-marching"] { --accent: #ffbe65; --accent-rgb: 255, 190, 101; }
body[data-effect="gpgpu-particles"] { --accent: #8ea7ff; --accent-rgb: 142, 167, 255; }
body[data-effect="lens-refraction"] { --accent: #83e4ff; --accent-rgb: 131, 228, 255; }
body[data-effect="rgb-shift"] { --accent: #ff5f9f; --accent-rgb: 255, 95, 159; }
body[data-effect="afterimage-feedback"] { --accent: #b39bff; --accent-rgb: 179, 155, 255; }
body[data-effect="volumetric-god-rays"] { --accent: #ffd987; --accent-rgb: 255, 217, 135; }
body[data-effect="morph-targets"] { --accent: #7fffd2; --accent-rgb: 127, 255, 210; }

a { color: inherit; text-decoration: none; }
button { color: inherit; font: inherit; }
::selection { color: #05070d; background: var(--accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }

.skip-link {
    position: fixed;
    top: 10px;
    left: 12px;
    z-index: 100;
    padding: 10px 14px;
    border-radius: 999px;
    color: #05070d;
    background: #fff;
    transform: translateY(-170%);
    transition: transform 180ms ease;
}

.skip-link:focus { transform: none; }

.lab-nav {
    position: fixed;
    top: max(16px, env(safe-area-inset-top));
    left: 50%;
    z-index: 40;
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    width: min(1180px, calc(100% - 32px));
    min-height: 54px;
    padding: 7px 10px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: rgba(5, 7, 13, 0.58);
    box-shadow: inset 0 1px rgba(255, 255, 255, 0.1), 0 18px 70px rgba(0, 0, 0, 0.28);
    backdrop-filter: blur(18px) saturate(1.3);
    -webkit-backdrop-filter: blur(18px) saturate(1.3);
    transform: translateX(-50%);
}

.back-link {
    display: inline-flex;
    width: fit-content;
    min-height: 40px;
    align-items: center;
    gap: 9px;
    padding: 0 14px;
    border-radius: 999px;
    color: var(--muted);
    font-size: 0.82rem;
    font-weight: 680;
    transition: color 180ms ease, background 180ms ease, transform 180ms var(--ease);
    touch-action: manipulation;
}

.back-link:hover,
.back-link:focus-visible {
    color: var(--ink);
    background: rgba(255, 255, 255, 0.09);
    transform: translateX(-2px);
}

.nav-label,
.nav-counter {
    margin: 0;
    color: var(--faint);
    font-size: 0.67rem;
    font-weight: 760;
    letter-spacing: 0.17em;
    text-transform: uppercase;
}

.nav-label {
    display: flex;
    align-items: center;
    gap: 9px;
    color: var(--muted);
}

.nav-label i {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 18px rgba(var(--accent-rgb), 0.9);
}

.nav-counter { justify-self: end; padding-right: 14px; }

.lab-stage {
    position: relative;
    width: 100%;
    height: 100svh;
    min-height: 610px;
    overflow: hidden;
    isolation: isolate;
    touch-action: pinch-zoom;
    background:
        radial-gradient(circle at 76% 34%, rgba(var(--accent-rgb), 0.1), transparent 31rem),
        #05070d;
}

#lab-canvas,
.lab-grid,
.lab-vignette,
.lab-noise {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
}

#lab-canvas {
    z-index: -4;
    display: block;
    opacity: 0;
    transition: opacity 500ms ease;
    touch-action: none;
}

.is-ready #lab-canvas { opacity: 1; }

.lab-grid {
    z-index: -3;
    opacity: 0.16;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.12) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.12) 1px, transparent 1px);
    background-size: 72px 72px;
    mask-image: radial-gradient(circle at 68% 48%, #000 0%, transparent 72%);
    -webkit-mask-image: radial-gradient(circle at 68% 48%, #000 0%, transparent 72%);
    pointer-events: none;
}

.lab-vignette {
    z-index: -2;
    background:
        linear-gradient(90deg, rgba(5, 7, 13, 0.93) 0%, rgba(5, 7, 13, 0.58) 32%, transparent 62%),
        linear-gradient(0deg, rgba(5, 7, 13, 0.72), transparent 30%, rgba(5, 7, 13, 0.25));
    pointer-events: none;
}

.lab-noise {
    z-index: 2;
    opacity: 0.045;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.92' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.8'/%3E%3C/svg%3E");
    pointer-events: none;
}

.hero-copy {
    position: absolute;
    top: clamp(126px, 18vh, 188px);
    left: max(32px, calc((100vw - 1180px) / 2));
    z-index: 8;
    width: min(530px, 42vw);
    pointer-events: none;
}

.eyebrow {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 0 0 20px;
    color: var(--muted);
    font-size: 0.68rem;
    font-weight: 760;
    letter-spacing: 0.18em;
    text-transform: uppercase;
}

.eyebrow span {
    display: grid;
    width: 34px;
    height: 34px;
    place-items: center;
    border: 1px solid var(--line);
    border-radius: 50%;
    color: var(--accent);
    letter-spacing: 0;
}

.hero-copy h1 {
    margin: 0;
    font-size: clamp(3.7rem, 7.4vw, 8.2rem);
    font-weight: 830;
    line-height: 0.78;
    letter-spacing: -0.075em;
    text-transform: uppercase;
}

.hero-copy h1 em {
    display: inline-block;
    color: transparent;
    background: linear-gradient(92deg, #fff 0%, var(--accent) 70%, rgba(var(--accent-rgb), 0.42));
    background-clip: text;
    -webkit-background-clip: text;
    font-style: normal;
}

.intro {
    max-width: 500px;
    margin: 26px 0 0;
    color: var(--muted);
    font-size: clamp(0.9rem, 1.3vw, 1.03rem);
    line-height: 1.8;
}

.lab-note {
    position: absolute;
    right: max(32px, calc((100vw - 1180px) / 2));
    bottom: 150px;
    z-index: 7;
    width: min(290px, 24vw);
    padding: 18px 20px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: rgba(6, 9, 17, 0.52);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    pointer-events: none;
}

.lab-note p,
.lab-note strong,
.lab-note span { display: block; }
.lab-note p { margin: 0 0 10px; color: var(--accent); font-size: 0.63rem; font-weight: 780; letter-spacing: 0.18em; }
.lab-note strong { margin-bottom: 8px; font-family: "Cascadia Code", "SFMono-Regular", monospace; font-size: 0.95rem; }
.lab-note span { color: var(--muted); font-size: 0.76rem; line-height: 1.6; }

.interaction-dock {
    position: absolute;
    bottom: max(26px, env(safe-area-inset-bottom));
    left: max(32px, calc((100vw - 1180px) / 2));
    z-index: 15;
    display: flex;
    align-items: center;
    gap: 12px;
}

.live-state,
.lab-button {
    min-height: 52px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: rgba(5, 7, 13, 0.66);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
}

.live-state {
    display: flex;
    min-width: 250px;
    align-items: center;
    gap: 11px;
    padding: 8px 17px;
}

.live-state > i {
    width: 8px;
    height: 8px;
    flex: 0 0 auto;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 18px rgba(var(--accent-rgb), 0.9);
    animation: livePulse 1.7s ease-in-out infinite;
}

.live-state p { margin: 0; }
.live-state span,
.live-state small { display: block; }
.live-state span { color: var(--ink); font-size: 0.66rem; font-weight: 780; letter-spacing: 0.13em; }
.live-state small { margin-top: 3px; color: var(--faint); font-size: 0.66rem; }

.lab-button {
    min-width: 112px;
    padding: 0 19px;
    cursor: pointer;
    font-size: 0.72rem;
    font-weight: 740;
    letter-spacing: 0.07em;
    transition: color 180ms ease, background 180ms ease, transform 180ms var(--ease);
    touch-action: manipulation;
}

.lab-button:hover,
.lab-button:focus-visible {
    color: #05070d;
    background: var(--accent);
    transform: translateY(-2px);
}

.lab-button:disabled { cursor: default; opacity: 0.45; transform: none; }

.next-link {
    position: absolute;
    right: max(32px, calc((100vw - 1180px) / 2));
    bottom: max(28px, env(safe-area-inset-bottom));
    z-index: 16;
    display: flex;
    align-items: center;
    gap: 18px;
    padding: 8px 8px 8px 18px;
    border-radius: 999px;
    background: rgba(5, 7, 13, 0.56);
    font-size: 0.82rem;
    font-weight: 700;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: background 180ms ease, transform 180ms var(--ease);
}

.next-link small { display: block; margin-bottom: 2px; color: var(--faint); font-size: 0.57rem; letter-spacing: 0.13em; }
.next-link i { display: grid; width: 38px; height: 38px; place-items: center; border-radius: 50%; color: #05070d; background: var(--accent); font-style: normal; }
.next-link:hover,
.next-link:focus-visible { background: rgba(var(--accent-rgb), 0.13); transform: translateX(3px); }

.fallback {
    position: absolute;
    top: 50%;
    right: 12%;
    z-index: 6;
    width: min(420px, 38vw);
    margin: 0;
    padding: 24px;
    border: 1px solid rgba(var(--accent-rgb), 0.28);
    border-radius: 22px;
    color: var(--muted);
    background: rgba(5, 7, 13, 0.86);
    line-height: 1.7;
    transform: translateY(-50%);
}

.fallback[hidden] { display: none; }
.no-script { position: fixed; inset: auto 20px 20px; z-index: 80; margin: 0; padding: 14px 18px; border-radius: 12px; color: #05070d; background: var(--accent); text-align: center; }

body[data-effect="reaction-diffusion"] #lab-canvas { image-rendering: auto; }
body[data-effect="lens-refraction"] .lab-vignette,
body[data-effect="rgb-shift"] .lab-vignette { background: linear-gradient(90deg, rgba(5, 7, 13, 0.91), transparent 48%, rgba(5, 7, 13, 0.12)); }

@keyframes livePulse { 50% { opacity: 0.45; transform: scale(0.72); } }

@media (max-width: 760px) {
    .lab-nav { grid-template-columns: 1fr auto; width: calc(100% - 24px); }
    .nav-label { display: none; }
    .nav-counter { padding-right: 10px; }
    .lab-stage { min-height: 560px; }
    .hero-copy { top: 112px; left: 22px; width: calc(100% - 44px); }
    .hero-copy h1 { font-size: clamp(3.1rem, 17vw, 5.3rem); line-height: 0.82; }
    .intro { max-width: 92%; margin-top: 18px; font-size: 0.86rem; line-height: 1.65; }
    .lab-vignette { background: linear-gradient(180deg, rgba(5, 7, 13, 0.83) 0%, rgba(5, 7, 13, 0.16) 58%, rgba(5, 7, 13, 0.8)); }
    .lab-note { right: 18px; bottom: 103px; width: min(245px, calc(100% - 36px)); padding: 12px 15px; }
    .lab-note span { display: none; }
    .interaction-dock { right: 18px; bottom: max(22px, env(safe-area-inset-bottom)); left: 18px; }
    .live-state { min-width: 0; flex: 1; }
    .live-state small { max-width: 43vw; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
    .lab-button { min-width: 94px; padding-inline: 14px; }
    .next-link { top: 78px; right: 18px; bottom: auto; padding: 5px; background: transparent; }
    .next-link span { display: none; }
    .next-link i { width: 34px; height: 34px; }
    .fallback { top: 58%; right: 18px; width: calc(100% - 36px); }
}

@media (max-height: 650px) and (min-width: 640px) {
    .lab-nav { top: 10px; }
    .lab-stage { min-height: 500px; }
    .hero-copy { top: 90px; width: min(500px, 43vw); }
    .hero-copy h1 { font-size: clamp(3rem, 7vw, 5.6rem); }
    .intro { margin-top: 16px; font-size: 0.82rem; line-height: 1.55; }
    .lab-note { bottom: 92px; }
    .interaction-dock,
    .next-link { bottom: 18px; }
}

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