/* PeerX — shared design system. */

:root {
    color-scheme: dark;

    --bg: #000;
    --fg: rgba(255, 255, 255, 0.92);
    --fg-soft: rgba(255, 255, 255, 0.55);
    --fg-muted: rgba(255, 255, 255, 0.35);
    --fg-faint: rgba(255, 255, 255, 0.16);

    --glass-bg: rgba(255, 255, 255, 0.04);
    --glass-bg-hover: rgba(255, 255, 255, 0.06);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-border-hover: rgba(255, 255, 255, 0.18);

    --radius-sm: 12px;
    --radius-md: 16px;
    --radius-lg: 22px;
    --radius-xl: 28px;

    --ease: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

* { box-sizing: border-box; }
html { -webkit-font-smoothing: antialiased; scroll-behavior: smooth; }
html, body { background: var(--bg); }
body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro", "Inter", system-ui, sans-serif;
    color: var(--fg);
    margin: 0;
    min-height: 100vh;
    line-height: 1.5;
    overflow-x: hidden;
    position: relative;
}

/*Language gating */
[data-l] { display: none; }
html[lang="en"] [data-l="en"] { display: revert; }
html[lang="ru"] [data-l="ru"] { display: revert; }

/*Ambient backdrop (3 drifting glows + grain) */
.ambient {
    position: fixed;
    inset: 0;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}
.ambient::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0.04 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    opacity: 0.5;
    mix-blend-mode: overlay;
}
.glow {
    position: absolute;
    width: 60vmax;
    height: 60vmax;
    border-radius: 50%;
    filter: blur(100px);
    will-change: transform;
}
.glow-1 {
    top: -25%; left: -20%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.18), rgba(99, 102, 241, 0) 65%);
    animation: drift-1 28s ease-in-out infinite;
}
.glow-2 {
    top: 20%; right: -25%;
    background: radial-gradient(circle, rgba(236, 72, 153, 0.13), rgba(236, 72, 153, 0) 65%);
    animation: drift-2 36s ease-in-out infinite;
}
.glow-3 {
    bottom: -30%; left: 25%;
    background: radial-gradient(circle, rgba(34, 211, 238, 0.10), rgba(34, 211, 238, 0) 65%);
    animation: drift-3 42s ease-in-out infinite;
}
@keyframes drift-1 {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(60px, 80px) scale(1.08); }
    66% { transform: translate(-30px, 50px) scale(0.95); }
}
@keyframes drift-2 {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(-80px, 60px) scale(1.1); }
}
@keyframes drift-3 {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(70px, -50px) scale(1.05); }
}

/*Page layout */
.page {
    position: relative;
    max-width: 720px;
    margin: 0 auto;
    padding: 24px 24px 56px;
}

/*Sticky pill header */
header.top {
    position: sticky;
    top: 16px;
    z-index: 10;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 14px 8px 10px;
    background: rgba(0, 0, 0, 0.45);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border: 1px solid var(--glass-border);
    border-radius: 999px;
    margin: 0 auto 56px;
    width: fit-content;
    max-width: 100%;
}
.brand-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--fg);
    text-decoration: none;
    font-weight: 600;
    font-size: 15px;
    letter-spacing: -0.01em;
    padding: 4px 4px 4px 0;
}
.brand-link img {
    display: block;
    width: 26px;
    height: 26px;
    border-radius: 28%;
    background: #0a0a0a;
}
.lang-switch {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    padding: 3px;
    background: rgba(255, 255, 255, 0.04);
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.06);
}
.lang-pill {
    font: inherit;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.04em;
    color: var(--fg-soft);
    background: transparent;
    border: 0;
    padding: 5px 10px;
    border-radius: 999px;
    cursor: pointer;
    transition: background 0.25s var(--ease), color 0.25s var(--ease);
}
.lang-pill[aria-pressed="true"] { background: rgba(255, 255, 255, 0.10); color: #fff; }
.lang-pill:hover { color: #fff; }

/*Eyebrow tag */
.eyebrow {
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--fg-muted);
    margin: 0 0 14px;
}

/*Glass card with cursor spotlight (used for features + FAQ items) */
.feature {
    position: relative;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 20px 22px;
    backdrop-filter: blur(20px) saturate(160%);
    -webkit-backdrop-filter: blur(20px) saturate(160%);
    transition:
        background 0.3s var(--ease),
        border-color 0.3s var(--ease),
        transform 0.3s var(--ease);
    overflow: hidden;
    isolation: isolate;
    --spot-x: 50%;
    --spot-y: 50%;
}
.feature::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: radial-gradient(
        240px circle at var(--spot-x) var(--spot-y),
        rgba(255, 255, 255, 0.08),
        transparent 50%);
    opacity: 0;
    transition: opacity 0.3s var(--ease);
    pointer-events: none;
    z-index: 0;
}
.feature:hover {
    background: var(--glass-bg-hover);
    border-color: var(--glass-border-hover);
    transform: translateY(-1px);
}
.feature:hover::before { opacity: 1; }
.feature > * { position: relative; z-index: 1; }
.feature-icon {
    display: grid;
    place-items: center;
    width: 32px;
    height: 32px;
    margin-bottom: 12px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 10px;
}
.feature-icon svg { width: 16px; height: 16px; color: #fff; }
.feature h3,
.doc .feature h3 {
    font-size: 16px;
    font-weight: 600;
    color: #fff;
    margin: 0 0 6px;
}
.feature p,
.doc .feature p {
    font-size: 13px;
    color: var(--fg-soft);
    margin: 0;
    line-height: 1.5;
}

/*How-card: numbered step list inside one glass surface */
.how-card {
    position: relative;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: 28px 28px 22px;
    backdrop-filter: blur(24px) saturate(170%);
    -webkit-backdrop-filter: blur(24px) saturate(170%);
    overflow: hidden;
    isolation: isolate;
}
.how-step {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 14px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}
.how-step:last-child { border-bottom: 0; padding-bottom: 0; }
.how-step:first-child { padding-top: 0; }
.step-num {
    display: grid;
    place-items: center;
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    background: rgba(255, 255, 255, 0.07);
    border: 1px solid rgba(255, 255, 255, 0.10);
    border-radius: 999px;
    font-size: 13px;
    font-weight: 700;
    color: #fff;
    font-feature-settings: "tnum";
}
.step-text { color: var(--fg); font-size: 15px; padding-top: 3px; }

/*Callout box (highlighted info block on doc pages) */
.callout {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 18px 22px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(20px) saturate(160%);
    -webkit-backdrop-filter: blur(20px) saturate(160%);
    margin: 18px 0 28px;
}
.callout-icon {
    flex-shrink: 0;
    display: grid;
    place-items: center;
    width: 36px;
    height: 36px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 11px;
}
.callout-icon svg { width: 18px; height: 18px; color: #fff; }
.callout p,
.doc .callout p {
    color: var(--fg);
    margin: 0;
    font-size: 14px;
    line-height: 1.55;
}
.callout p:not(:last-child),
.doc .callout p:not(:last-child) { margin-bottom: 6px; }
.callout p strong,
.doc .callout p strong { color: #fff; font-weight: 600; }

/*Buttons */
.btn {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 22px;
    border-radius: 14px;
    font-weight: 600;
    font-size: 15px;
    text-decoration: none;
    white-space: nowrap;
    transition:
        transform 0.15s var(--ease),
        background 0.25s var(--ease),
        border-color 0.25s var(--ease),
        box-shadow 0.25s var(--ease);
    overflow: hidden;
    isolation: isolate;
}
.btn:active { transform: scale(0.98); }
.btn-primary {
    background: #fff;
    color: #000;
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.4) inset, 0 8px 24px rgba(255, 255, 255, 0.1);
}
.btn-primary:hover {
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.4) inset, 0 12px 32px rgba(255, 255, 255, 0.16);
}
.btn-primary::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(110deg,
        transparent 25%,
        rgba(255, 255, 255, 0.55) 50%,
        transparent 75%);
    transform: translateX(-120%);
    pointer-events: none;
    mix-blend-mode: overlay;
}
.btn-primary:hover::after { animation: shine 1.2s var(--ease-out); }
@keyframes shine {
    from { transform: translateX(-120%); }
    to   { transform: translateX(120%); }
}
.btn-secondary {
    background: var(--glass-bg);
    color: var(--fg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
}
.btn-secondary:hover {
    background: var(--glass-bg-hover);
    border-color: var(--glass-border-hover);
}
.btn .icon { width: 18px; height: 18px; flex-shrink: 0; }

/*Doc-page typography (privacy / support reading column) */
.doc {
    max-width: 660px;
    margin: 0 auto;
}
.doc-hero {
    margin-bottom: 56px;
}
.doc-hero-icon {
    display: grid;
    place-items: center;
    width: 64px;
    height: 64px;
    margin-bottom: 24px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 18px;
    backdrop-filter: blur(20px) saturate(160%);
    -webkit-backdrop-filter: blur(20px) saturate(160%);
}
.doc-hero-icon svg { width: 28px; height: 28px; color: #fff; }
.doc h1 {
    font-size: clamp(34px, 5.5vw, 48px);
    font-weight: 700;
    letter-spacing: -0.03em;
    margin: 0 0 14px;
    line-height: 1.1;
    color: #fff;
}
.doc-meta {
    font-size: 14px;
    color: var(--fg-muted);
    margin: 0 0 24px;
}
.doc-lead {
    font-size: 17px;
    line-height: 1.55;
    color: var(--fg-soft);
    margin: 0;
}
.doc-section {
    margin-bottom: 44px;
    scroll-margin-top: 90px;
}
.doc h2 {
    font-size: clamp(20px, 3vw, 24px);
    font-weight: 600;
    color: #fff;
    margin: 0 0 14px;
    letter-spacing: -0.015em;
}
.doc h3 {
    font-size: 16px;
    font-weight: 600;
    color: #fff;
    margin: 22px 0 8px;
}
.doc p {
    color: var(--fg-soft);
    font-size: 15px;
    line-height: 1.65;
    margin: 0 0 12px;
}
.doc p strong { color: var(--fg); font-weight: 600; }
.doc ul, .doc ol {
    color: var(--fg-soft);
    font-size: 15px;
    line-height: 1.65;
    padding-left: 22px;
    margin: 0 0 12px;
}
.doc li { margin-bottom: 6px; }
.doc li::marker { color: var(--fg-muted); }
.doc a {
    color: #fff;
    text-decoration: underline;
    text-decoration-color: rgba(255, 255, 255, 0.3);
    text-underline-offset: 3px;
    transition: text-decoration-color 0.2s var(--ease);
}
.doc a:hover { text-decoration-color: rgba(255, 255, 255, 0.7); }
.doc code {
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 13px;
    background: rgba(255, 255, 255, 0.06);
    padding: 1px 6px;
    border-radius: 6px;
    color: #fff;
}

/*Footer */
footer.bottom {
    margin-top: 80px;
    padding-top: 28px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    text-align: center;
    color: var(--fg-muted);
    font-size: 13px;
}
footer.bottom .links {
    display: flex;
    gap: 18px;
    justify-content: center;
    margin-bottom: 14px;
    flex-wrap: wrap;
}
footer.bottom a {
    color: var(--fg-soft);
    text-decoration: none;
    transition: color 0.2s var(--ease);
}
footer.bottom a:hover { color: #fff; }
footer.bottom .small { font-size: 12px; color: var(--fg-muted); }

/*Reveal-on-scroll (only active when JS is up) */
.reveal {
    transition:
        opacity 0.7s var(--ease-out),
        transform 0.7s var(--ease-out);
}
html.js .reveal {
    opacity: 0;
    transform: translateY(16px);
}
html.js .reveal.in {
    opacity: 1;
    transform: translateY(0);
}

/*Focus styles */
:focus-visible {
    outline: 2px solid rgba(255, 255, 255, 0.6);
    outline-offset: 3px;
    border-radius: 4px;
}
.btn:focus-visible { outline-offset: 4px; }

/*Reduced motion: kill loops, preserve layout */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
        scroll-behavior: auto !important;
    }
    .glow-1, .glow-2, .glow-3 { animation: none !important; }
    .reveal { opacity: 1; transform: none; }
}

/*Mobile */
@media (max-width: 520px) {
    header.top { margin-bottom: 40px; }
    .doc-hero { margin-bottom: 40px; }
    .doc-section { margin-bottom: 36px; }
}