/* ============================================================
   InstaMP4 — FX layer. Everything loud lives here so the base
   components stay readable. Sunset + FB-blue, maxed out.
   ============================================================ */

@property --a  { syntax: '<angle>'; inherits: false; initial-value: 0deg; }
@property --a2 { syntax: '<angle>'; inherits: false; initial-value: 0deg; }

/* ---------- scroll progress bar ---------- */
.scroll-progress {
    position: fixed; top: 0; left: 0; height: 3px; width: 0%; pointer-events: none;
    z-index: 999;
    background: linear-gradient(90deg, var(--ig-yellow), var(--ig-orange), var(--ig-pink), var(--fb-blue));
    box-shadow: 0 0 12px rgba(255,46,116,0.7);
    transition: width 0.1s linear;
}
.theme-facebook .scroll-progress {
    background: linear-gradient(90deg, var(--fb-blue-lt), var(--fb-blue), var(--ig-pink));
}

/* ---------- richer background: grain + vignette + aura sweep ---------- */
body::after {
    content: ''; position: fixed; inset: 0; z-index: 0; pointer-events: none;
    background:
        radial-gradient(120% 90% at 50% -10%, transparent 55%, rgba(0,0,0,0.45) 100%),
        url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='120' height='120'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/></filter><rect width='120' height='120' filter='url(%23n)' opacity='0.035'/></svg>");
    mix-blend-mode: overlay;
}
.field::after {
    content: ''; position: absolute; inset: -30%;
    background: conic-gradient(from var(--a2),
        transparent 0deg, rgba(255,46,116,0.06) 60deg, transparent 130deg,
        rgba(24,119,242,0.05) 200deg, transparent 270deg, rgba(138,58,185,0.06) 320deg, transparent 360deg);
    animation: aura-spin 40s linear infinite;
}
@keyframes aura-spin { to { --a2: 360deg; } }

/* orbs get a slow hue drift + breathing so the field feels alive */
.field__orb { animation-timing-function: ease-in-out; }
.field__orb--pink   { animation: drift-a 20s ease-in-out infinite, breathe 9s ease-in-out infinite; }
.field__orb--purple { animation: drift-b 24s ease-in-out infinite, breathe 11s ease-in-out infinite; }
.field__orb--blue   { animation: drift-a 27s ease-in-out infinite reverse, breathe 13s ease-in-out infinite; }
@keyframes breathe { 0%,100% { opacity:0.30; } 50% { opacity:0.46; } }

/* ---------- wordmark: gradient drift + neon pulse + flicker ---------- */
.wordmark {
    background-size: 220% 220%;
    animation: wm-flow 8s ease infinite;
    filter: drop-shadow(0 0 26px rgba(255,46,116,0.35));
}
.theme-facebook .wordmark { filter: drop-shadow(0 0 26px rgba(24,119,242,0.4)); }
@keyframes wm-flow {
    0%,100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}
.wordmark::before, .wordmark::after { text-shadow: 0 0 18px currentColor; }

/* ---------- section eyebrows: animated sheen ---------- */
.section__eyebrow {
    background-size: 180% 100%;
    animation: eyebrow-flow 5s ease infinite;
    box-shadow: 0 4px 18px -6px rgba(255,46,116,0.6);
}
@keyframes eyebrow-flow { 0%,100% { background-position: 0% 0; } 50% { background-position: 100% 0; } }

/* ---------- section headings: shimmer sweep on the text ---------- */
.section__heading {
    background: linear-gradient(100deg, var(--text) 0%, var(--text) 40%, var(--ig-pink) 50%, var(--text) 60%, var(--text) 100%);
    background-size: 220% 100%;
    -webkit-background-clip: text; background-clip: text; color: transparent;
    animation: heading-shimmer 6s linear infinite;
}
.theme-facebook .section__heading {
    background-image: linear-gradient(100deg, var(--text) 0%, var(--text) 40%, var(--fb-blue-lt) 50%, var(--text) 60%, var(--text) 100%);
    -webkit-background-clip: text; background-clip: text;
}
@keyframes heading-shimmer { 0% { background-position: 120% 0; } 100% { background-position: -20% 0; } }

/* ---------- chips: staggered glow pulse ---------- */
.chip { animation: chip-pulse 3s ease-in-out infinite; }
.chip:nth-child(2) { animation-delay: 0.6s; }
.chip:nth-child(3) { animation-delay: 1.2s; }
@keyframes chip-pulse {
    0%,100% { border-color: var(--line-bright); box-shadow: none; }
    50% { border-color: var(--ig-pink); box-shadow: 0 0 16px -4px var(--ig-pink); }
}
.theme-facebook .chip { animation-name: chip-pulse-fb; }
@keyframes chip-pulse-fb {
    0%,100% { border-color: var(--line-bright); box-shadow: none; }
    50% { border-color: var(--fb-blue); box-shadow: 0 0 16px -4px var(--fb-blue); }
}

/* ---------- container: outer glow pulse layered over the spin ---------- */
.container::after {
    content: ''; position: absolute; inset: -3px; border-radius: inherit; z-index: -1;
    background: conic-gradient(from var(--angle), var(--ig-pink), var(--fb-blue), var(--ig-orange), var(--ig-pink));
    filter: blur(22px); opacity: 0.5;
    animation: glow-breathe 4s ease-in-out infinite;
}
@keyframes glow-breathe { 0%,100% { opacity: 0.35; } 50% { opacity: 0.7; } }

/* ---------- CTA button: breathing glow + gradient drift ---------- */
.download-url-button, .modal-download-link, .download-options-modal__footer button {
    background-size: 220% 100%;
    animation: cta-flow 6s ease infinite;
}
@keyframes cta-flow { 0%,100% { background-position: 0% 0; } 50% { background-position: 100% 0; } }
.download-url-button::before {
    content: ''; position: absolute; inset: 0; border-radius: inherit; z-index: -1;
    box-shadow: 0 0 0 0 rgba(255,46,116,0.5);
    animation: cta-ping 2.6s ease-out infinite;
}
@keyframes cta-ping {
    0% { box-shadow: 0 0 0 0 rgba(255,46,116,0.45); }
    70%,100% { box-shadow: 0 0 0 16px rgba(255,46,116,0); }
}
.theme-facebook .download-url-button::before { animation: cta-ping-fb 2.6s ease-out infinite; }
@keyframes cta-ping-fb {
    0% { box-shadow: 0 0 0 0 rgba(24,119,242,0.45); }
    70%,100% { box-shadow: 0 0 0 16px rgba(24,119,242,0); }
}

/* ---------- feature cards: entrance, animated border ring, tilt ---------- */
.feature-card, .step { position: relative; transform-style: preserve-3d; }
.feature-card::before {
    content: ''; position: absolute; inset: -2px; border-radius: inherit; padding: 2px;
    background: conic-gradient(from var(--a),
        var(--ig-pink), var(--ig-orange), var(--ig-yellow), var(--fb-blue), var(--ig-purple), var(--ig-pink));
    -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
    -webkit-mask-composite: xor; mask-composite: exclude;
    opacity: 0; transition: opacity 0.35s ease;
    pointer-events: none;
}
.feature-card:hover::before { opacity: 1; animation: ring-spin 3s linear infinite; }
@keyframes ring-spin { to { --a: 360deg; } }
.feature-card:hover { box-shadow: var(--sticker), 0 0 34px -8px var(--ig-pink); }
.theme-facebook .feature-card:hover { box-shadow: var(--sticker), 0 0 34px -8px var(--fb-blue); }

/* icon gets a glow + gentle idle float */
.feature-card__icon { filter: drop-shadow(0 0 0 transparent); transition: filter 0.3s, transform 0.3s var(--bounce); }
.feature-card:hover .feature-card__icon { filter: drop-shadow(0 0 10px var(--ig-pink)); }

/* ---------- steps: glowing leading number ---------- */
.step::before { text-shadow: 0 0 16px rgba(255,46,116,0.5); }
.step:hover { box-shadow: var(--block-shadow), 0 0 28px -10px var(--fb-blue); }

/* ---------- comparison yes: shimmer ---------- */
.comparison__yes {
    background-size: 200% 100%;
    animation: cta-flow 4s ease infinite;
}

/* ---------- platform switch active: animated gradient ---------- */
.platform-switch a[aria-current="page"] {
    background-size: 200% 100%;
    animation: cta-flow 5s ease infinite;
}

/* ---------- nav: logo + underline glow ---------- */
.brand-logo { display: inline-flex; align-items: center; gap: 9px; text-decoration: none; margin-right: 4px; }
.brand-logo img { width: 30px; height: 30px; filter: drop-shadow(0 3px 8px rgba(0,0,0,0.5)); transition: transform 0.4s var(--bounce); }
.brand-logo:hover img { transform: rotate(-8deg) scale(1.08); }
.brand-logo span {
    font-family: var(--display); font-weight: 700; font-size: 0.98rem; letter-spacing: -0.01em;
    background: linear-gradient(100deg, var(--ig-yellow), var(--ig-pink) 60%, var(--ig-purple));
    -webkit-background-clip: text; background-clip: text; color: transparent;
}
.theme-facebook .brand-logo span { background: linear-gradient(100deg, var(--fb-blue-lt), var(--fb-blue)); -webkit-background-clip: text; background-clip: text; }
.site-nav__link:hover { text-shadow: 0 0 12px var(--ig-pink); }
.theme-facebook .site-nav__link:hover { text-shadow: 0 0 12px var(--fb-blue); }

/* ---------- marquee tape ---------- */
.marquee {
    position: relative; z-index: 1; overflow: hidden;
    margin: 30px 0 0; padding: 11px 0;
    border-top: 1px solid var(--line-bright); border-bottom: 1px solid var(--line-bright);
    background: linear-gradient(90deg, rgba(255,46,116,0.06), rgba(24,119,242,0.06));
    -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
    mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
}
.marquee__track { display: inline-flex; gap: 34px; white-space: nowrap; animation: marquee 22s linear infinite; }
.marquee__track span {
    font-family: var(--mono); font-size: 0.8rem; letter-spacing: 0.16em; text-transform: uppercase;
    color: var(--text-dim); display: inline-flex; align-items: center; gap: 34px;
}
.marquee__track span::after { content: '◆'; color: var(--ig-pink); font-size: 0.7em; }
.theme-facebook .marquee__track span::after { color: var(--fb-blue); }
@keyframes marquee { to { transform: translateX(-50%); } }
.marquee:hover .marquee__track { animation-play-state: paused; }

/* ---------- reveal: add a tiny blur-in for depth ---------- */
.reveal { filter: blur(6px); }
.reveal.is-visible { filter: blur(0); transition: opacity 0.6s ease, transform 0.6s var(--bounce), filter 0.6s ease; }

/* ---------- doc pages: gradient top rule ---------- */
.doc { position: relative; overflow: hidden; }
.doc::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px;
    background: linear-gradient(90deg, var(--ig-yellow), var(--ig-orange), var(--ig-pink), var(--ig-purple), var(--fb-blue));
    background-size: 200% 100%; animation: cta-flow 6s ease infinite;
}

/* ---------- FAQ open glow ---------- */
.faq__item[open] { box-shadow: inset 3px 0 0 var(--ig-pink); }
.theme-facebook .faq__item[open] { box-shadow: inset 3px 0 0 var(--fb-blue); }

/* ---------- honor reduced motion: kill the loud loops ---------- */
@media (prefers-reduced-motion: reduce) {
    .wordmark, .section__eyebrow, .section__heading, .chip, .container::after,
    .download-url-button, .download-url-button::before, .modal-download-link,
    .comparison__yes, .platform-switch a[aria-current="page"], .field::after,
    .field__orb, .marquee__track, .doc::before, .feature-card:hover::before {
        animation: none !important;
    }
    .section__heading { color: var(--text); -webkit-text-fill-color: var(--text); }
    .reveal { filter: none; }
}