/* ============================================================================
   BTViz landing page — design system v2
   ----------------------------------------------------------------------------
   Style direction: Dark Mode (OLED) + Bento Grid + Subtle Tech Glow
   Typography:      Space Grotesk (display) + Inter (body) + JetBrains Mono (code)
   ============================================================================ */

:root {
    /* ── Palette — Deep Space Tech (refined) ─────────────────────────────── */
    --c-bg:            #06060a;
    --c-bg-elev-1:    #0b0b13;
    --c-bg-elev-2:    #11111c;
    --c-bg-elev-3:    #161624;
    --c-border:        rgba(255, 255, 255, 0.06);
    --c-border-strong: rgba(255, 255, 255, 0.14);
    --c-border-active: rgba(96, 165, 250, 0.45);

    --c-fg:            #f5f7fa;
    --c-fg-muted:      #b4bac5;   /* body text — 7.5:1 on #06060a */
    --c-fg-dim:        #7c8492;   /* labels, footnotes — 4.7:1 */

    --c-accent:        #3b82f6;   /* ZMQ Blue */
    --c-accent-soft:   #60a5fa;
    --c-accent-2:      #a78bfa;   /* Status Violet */
    --c-success:       #22c55e;   /* Tick Green */
    --c-success-soft:  #4ade80;
    --c-warn:          #f59e0b;
    --c-danger:        #ef4444;

    /* ── Surfaces ────────────────────────────────────────────────────────── */
    --c-glass:        linear-gradient(155deg, rgba(22,22,36,0.74) 0%, rgba(11,11,19,0.92) 100%);
    --c-glass-hover:  linear-gradient(155deg, rgba(28,28,44,0.88) 0%, rgba(14,14,22,0.96) 100%);
    --c-card:         linear-gradient(180deg, rgba(255,255,255,0.035), rgba(255,255,255,0.008));
    --c-card-hover:   linear-gradient(180deg, rgba(255,255,255,0.055), rgba(255,255,255,0.015));

    /* ── Radius ──────────────────────────────────────────────────────────── */
    --r-sm: 8px;
    --r-md: 12px;
    --r-lg: 16px;
    --r-xl: 22px;
    --r-2xl: 28px;

    /* ── Shadow ──────────────────────────────────────────────────────────── */
    --sh-sm:         0 4px 12px -6px rgba(0,0,0,0.5);
    --sh-card:       0 18px 40px -28px rgba(0,0,0,0.85), inset 0 1px 0 rgba(255,255,255,0.04);
    --sh-card-hover: 0 24px 60px -28px rgba(59,130,246,0.5),  inset 0 1px 0 rgba(255,255,255,0.08);
    --sh-glow-blue:  0 0 32px -8px rgba(59,130,246,0.6);
    --sh-glow-purple:0 0 32px -8px rgba(167,139,250,0.6);

    /* ── Focus ring ──────────────────────────────────────────────────────── */
    --ring: 0 0 0 2px var(--c-bg), 0 0 0 4px var(--c-accent);

    /* ── Typography ──────────────────────────────────────────────────────── */
    --ff-display: "Space Grotesk", "Inter", system-ui, -apple-system, sans-serif;
    --ff-body:    "Inter", system-ui, -apple-system, sans-serif;
    --ff-mono:    "JetBrains Mono", ui-monospace, monospace;

    --fs-display: clamp(2.75rem, 5.4vw + 1rem, 5rem);
    --fs-h2:      clamp(1.75rem, 1.6vw + 1rem, 2.5rem);
    --fs-h3:      clamp(1.125rem, 0.5vw + 1rem, 1.35rem);
    --fs-lede:    clamp(1rem, 0.3vw + 0.95rem, 1.15rem);

    /* ── Layout ──────────────────────────────────────────────────────────── */
    --container: 1240px;

    /* ── Motion ──────────────────────────────────────────────────────────── */
    --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
    --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
    --d-fast: 140ms;
    --d-base: 220ms;
    --d-slow: 380ms;
}

/* Base ----------------------------------------------------------------------*/

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
html, body { min-height: 100%; }

body {
    margin: 0;
    background-color: var(--c-bg);
    color: var(--c-fg);
    font-family: var(--ff-body);
    overflow-x: hidden;
    font-feature-settings: "ss01" on, "cv11" on;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    line-height: 1.55;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

h1, h2, h3, h4, h5 {
    font-family: var(--ff-display);
    font-weight: 600;
    letter-spacing: -0.022em;
    margin: 0;
}

p { margin: 0; }
a { color: inherit; }

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Accessibility: skip link */
.skip-link {
    position: absolute;
    left: 12px; top: 12px;
    transform: translateY(-150%);
    padding: 8px 14px;
    background: var(--c-fg);
    color: var(--c-bg);
    border-radius: var(--r-md);
    font-weight: 600;
    z-index: 100;
    transition: transform 160ms var(--ease-out);
}
.skip-link:focus { transform: translateY(0); }

/* Global focus-visible */
:focus { outline: none; }
a:focus-visible, button:focus-visible,
[role="tab"]:focus-visible, [role="button"]:focus-visible {
    box-shadow: var(--ring);
    border-radius: var(--r-md);
}

/* Scrollbar */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track {
    background: var(--c-bg);
    border-left: 1px solid var(--c-border);
}
::-webkit-scrollbar-thumb {
    background: #232333;
    border-radius: 5px;
    border: 2px solid var(--c-bg);
}
::-webkit-scrollbar-thumb:hover { background: var(--c-accent); }

/* Selection */
::selection { background: rgba(59,130,246,0.35); color: #fff; }

/* Background atmospherics ---------------------------------------------------*/

.bg-grid {
    position: fixed;
    inset: 0;
    z-index: -1;
    opacity: 0.45;
    background-image:
        linear-gradient(to right, rgba(255,255,255,0.025) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(255,255,255,0.025) 1px, transparent 1px);
    background-size: 56px 56px;
    -webkit-mask-image: radial-gradient(ellipse at top, #000 0%, transparent 75%);
            mask-image: radial-gradient(ellipse at top, #000 0%, transparent 75%);
    pointer-events: none;
}

.glow-orb {
    position: fixed;
    width: 720px; height: 720px;
    border-radius: 50%;
    filter: blur(80px);
    z-index: -1;
    pointer-events: none;
    opacity: 0.55;
    background: radial-gradient(circle, rgba(59,130,246,0.18) 0%, rgba(139,92,246,0.12) 45%, transparent 70%);
    will-change: transform;
    animation: orb-drift 22s ease-in-out infinite alternate;
}
.glow-orb--purple {
    background: radial-gradient(circle, rgba(167,139,250,0.18) 0%, rgba(59,130,246,0.10) 45%, transparent 70%);
    animation-duration: 28s;
    animation-direction: alternate-reverse;
}
.glow-orb:nth-of-type(3) { animation-duration: 34s; }

@keyframes orb-drift {
    0%   { transform: translate3d(0, 0, 0)         scale(1); }
    33%  { transform: translate3d(40px, -30px, 0)  scale(1.08); }
    66%  { transform: translate3d(-25px, 35px, 0)  scale(0.95); }
    100% { transform: translate3d(20px, 20px, 0)   scale(1.04); }
}

/* Reveal-on-scroll utility --------------------------------------------------*/

[data-reveal] {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 700ms var(--ease-out), transform 700ms var(--ease-out);
    will-change: transform, opacity;
}
[data-reveal].is-visible {
    opacity: 1;
    transform: none;
}

/* Layout primitives ---------------------------------------------------------*/

.container {
    max-width: var(--container);
    margin-inline: auto;
    padding-inline: 1.5rem;
}

.section { padding-block: clamp(4rem, 7vw, 7rem); }
.section--tight { padding-block: clamp(2.5rem, 4vw, 4rem); }

.section__header { max-width: 760px; margin-bottom: 3rem; }
.section__header--center { margin-inline: auto; text-align: center; }
.section__eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    font-family: var(--ff-mono);
    font-size: 11px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--c-accent-soft);
    margin-bottom: 0.85rem;
}
.section__eyebrow::before {
    content: "";
    width: 22px; height: 1px;
    background: linear-gradient(to right, transparent, currentColor);
}
.section__header--center .section__eyebrow { justify-content: center; }
.section__header--center .section__eyebrow::before { display: none; }

.section__title {
    font-size: var(--fs-h2);
    font-weight: 600;
    color: var(--c-fg);
    line-height: 1.1;
    margin-bottom: 0.75rem;
    letter-spacing: -0.025em;
}
.section__title-accent {
    background: linear-gradient(120deg, #60a5fa 0%, #a78bfa 35%, #f0abfc 65%, #60a5fa 100%);
    background-size: 220% 220%;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: aurora-flow 9s ease-in-out infinite;
}
@keyframes aurora-flow {
    0%, 100% { background-position: 0% 50%; }
    50%      { background-position: 100% 50%; }
}
.section__lede {
    color: var(--c-fg-muted);
    font-size: var(--fs-lede);
    line-height: 1.65;
    max-width: 62ch;
}
.section__header--center .section__lede { margin-inline: auto; }

/* Surfaces ------------------------------------------------------------------*/

.glass-panel {
    background: var(--c-glass);
    backdrop-filter: blur(22px) saturate(1.2);
    -webkit-backdrop-filter: blur(22px) saturate(1.2);
    border: 1px solid var(--c-border);
    box-shadow: var(--sh-card);
}

.card {
    position: relative;
    border-radius: var(--r-xl);
    border: 1px solid var(--c-border);
    background: var(--c-card);
    transition:
        transform var(--d-base) var(--ease-out),
        border-color var(--d-base) var(--ease-out),
        box-shadow var(--d-base) var(--ease-out),
        background var(--d-base) var(--ease-out);
    overflow: hidden;
}
.card::before {
    content: "";
    position: absolute; inset: 0;
    pointer-events: none;
    border-radius: inherit;
    background: linear-gradient(125deg, rgba(59,130,246,0.10), transparent 40%, rgba(167,139,250,0.10));
    opacity: 0;
    transition: opacity var(--d-base) var(--ease-out);
}
.card:hover {
    transform: translateY(-3px);
    border-color: var(--c-border-active);
    box-shadow: var(--sh-card-hover);
    background: var(--c-card-hover);
}
.card:hover::before { opacity: 1; }
.card__body { padding: 1.65rem; position: relative; z-index: 1; height: 100%; display: flex; flex-direction: column; }

/* Buttons -------------------------------------------------------------------*/

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.55rem;
    padding: 0.7rem 1.15rem;
    border-radius: var(--r-md);
    font-family: var(--ff-body);
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: -0.01em;
    border: 1px solid transparent;
    cursor: pointer;
    transition:
        background var(--d-fast) var(--ease-out),
        color var(--d-fast) var(--ease-out),
        border-color var(--d-fast) var(--ease-out),
        box-shadow var(--d-fast) var(--ease-out),
        transform var(--d-fast) var(--ease-out);
    text-decoration: none;
    white-space: nowrap;
}
.btn:active { transform: translateY(1px); }

.btn--primary {
    background: linear-gradient(180deg, #4f8bf7, #2563eb);
    color: #fff;
    box-shadow:
        0 0 0 1px rgba(59,130,246,0.45),
        0 10px 30px -12px rgba(59,130,246,0.6),
        inset 0 1px 0 rgba(255,255,255,0.22);
}
.btn--primary:hover {
    background: linear-gradient(180deg, #60a5fa, #2563eb);
    box-shadow:
        0 0 0 1px rgba(59,130,246,0.65),
        0 16px 40px -12px rgba(59,130,246,0.75),
        inset 0 1px 0 rgba(255,255,255,0.28);
}

.btn--ghost {
    background: rgba(255,255,255,0.04);
    color: var(--c-fg);
    border-color: var(--c-border);
}
.btn--ghost:hover {
    background: rgba(255,255,255,0.08);
    border-color: var(--c-border-strong);
}

.btn--bare {
    color: var(--c-fg-muted);
    background: transparent;
    padding: 0.55rem 0.8rem;
}
.btn--bare:hover { color: var(--c-fg); background: rgba(255,255,255,0.04); }

.btn--lg { padding: 0.9rem 1.55rem; font-size: 0.98rem; }
.btn--sm { padding: 0.45rem 0.8rem; font-size: 0.8rem; }

/* Badges --------------------------------------------------------------------*/

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.2rem 0.6rem;
    border-radius: 999px;
    font-family: var(--ff-mono);
    font-size: 10px;
    letter-spacing: 0.06em;
    font-weight: 500;
    border: 1px solid var(--c-border);
    background: rgba(255,255,255,0.04);
    color: var(--c-fg-muted);
    white-space: nowrap;
}
.badge--blue   { background: rgba(59,130,246,0.12);  border-color: rgba(59,130,246,0.32);  color: #93c5fd; }
.badge--purple { background: rgba(167,139,250,0.12); border-color: rgba(167,139,250,0.32); color: #c4b5fd; }
.badge--green  { background: rgba(34,197,94,0.12);   border-color: rgba(34,197,94,0.32);   color: #86efac; }
.badge--amber  { background: rgba(245,158,11,0.12);  border-color: rgba(245,158,11,0.32);  color: #fcd34d; }

/* Pulse status dot */
.dot-pulse {
    position: relative;
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--c-success);
    flex-shrink: 0;
}
.dot-pulse::before {
    content: "";
    position: absolute;
    inset: -4px;
    border-radius: 50%;
    background: var(--c-success);
    opacity: 0.4;
    animation: pulse-ring 1.8s ease-out infinite;
}
@keyframes pulse-ring {
    0%   { transform: scale(0.6); opacity: 0.55; }
    100% { transform: scale(1.6); opacity: 0; }
}

/* Keyboard hint */
.kbd {
    font-family: var(--ff-mono);
    font-size: 0.78rem;
    padding: 0.12rem 0.42rem;
    border: 1px solid var(--c-border-strong);
    border-bottom-width: 2px;
    border-radius: var(--r-sm);
    background: rgba(255,255,255,0.04);
    color: var(--c-fg);
}

/* Code block ----------------------------------------------------------------*/

.code-block {
    background: rgba(0,0,0,0.6);
    border: 1px solid var(--c-border);
    border-radius: var(--r-md);
    font-family: var(--ff-mono);
    font-size: 0.8rem;
    line-height: 1.65;
    color: var(--c-fg);
    overflow-x: auto;
}
.code-block__header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.55rem 0.95rem;
    border-bottom: 1px solid var(--c-border);
    color: var(--c-fg-dim);
    font-size: 0.72rem;
    font-family: var(--ff-mono);
}
.code-block__body { padding: 1rem 1.15rem; }
.code-block__body .c { color: var(--c-fg-dim); }
.code-block__body .p { color: var(--c-accent-soft); }
.code-block__body .s { color: var(--c-success-soft); }
.code-block__body .k { color: var(--c-accent-2); }

.token-tag     { color: #f87171; }
.token-attr    { color: #fbbf24; }
.token-string  { color: #86efac; }
.token-comment { color: #64748b; font-style: italic; }

/* Nav -----------------------------------------------------------------------*/

.site-nav {
    position: fixed;
    inset: 0 0 auto 0;
    z-index: 50;
    background: rgba(6,6,10,0.72);
    backdrop-filter: blur(18px) saturate(1.5);
    -webkit-backdrop-filter: blur(18px) saturate(1.5);
    border-bottom: 1px solid var(--c-border);
}
.site-nav__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
}
.site-nav__brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--c-fg);
}
.site-nav__logo {
    width: 34px; height: 34px;
    border-radius: var(--r-md);
    background: linear-gradient(135deg, var(--c-accent), var(--c-accent-2));
    display: grid; place-items: center;
    box-shadow: 0 0 18px rgba(59,130,246,0.5), inset 0 1px 0 rgba(255,255,255,0.3);
    color: #fff;
    font-size: 1.05rem;
}
.site-nav__title {
    font-family: var(--ff-display);
    font-weight: 700;
    font-size: 1.1rem;
    letter-spacing: -0.02em;
    background: linear-gradient(to right, #fff, #b4bac5);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.site-nav__links {
    display: flex;
    align-items: center;
    gap: 2.25rem;
    font-size: 0.9rem;
    font-weight: 500;
}
.site-nav__links a {
    position: relative;
    color: var(--c-fg-muted);
    text-decoration: none;
    transition: color var(--d-fast);
    padding: 0.3rem 0;
}
.site-nav__links a::after {
    content: "";
    position: absolute;
    left: 0; right: 0; bottom: -4px;
    height: 2px;
    background: var(--c-accent);
    border-radius: 2px;
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--d-base) var(--ease-out);
}
.site-nav__links a:hover { color: var(--c-fg); }
.site-nav__links a.is-active { color: var(--c-fg); }
.site-nav__links a.is-active::after { transform: scaleX(1); }

.site-nav__actions { display: flex; align-items: center; gap: 0.75rem; }

.nav-toggle {
    display: none;
    width: 40px; height: 40px;
    align-items: center; justify-content: center;
    border-radius: var(--r-md);
    border: 1px solid var(--c-border);
    background: rgba(255,255,255,0.04);
    color: var(--c-fg);
    cursor: pointer;
    transition: background var(--d-fast);
}
.nav-toggle:hover { background: rgba(255,255,255,0.08); }

/* Mobile nav drawer */
.mobile-drawer {
    display: none;
    position: fixed;
    top: 68px; left: 0; right: 0;
    background: rgba(6,6,10,0.96);
    backdrop-filter: blur(22px);
    border-bottom: 1px solid var(--c-border);
    padding: 0.75rem 1.5rem 1.5rem;
    z-index: 49;
}
.mobile-drawer.is-open { display: block; }
.mobile-drawer a {
    display: block;
    padding: 0.85rem 0.25rem;
    color: var(--c-fg-muted);
    text-decoration: none;
    border-bottom: 1px solid var(--c-border);
    font-size: 0.95rem;
}
.mobile-drawer a:last-of-type { border-bottom: none; }

@media (max-width: 880px) {
    .site-nav__links { display: none; }
    .nav-toggle { display: inline-flex; }
    .site-nav__cta-desktop { display: none !important; }
}

/* Hero ----------------------------------------------------------------------*/

.hero {
    padding-top: clamp(5.5rem, 9vw, 8rem);
    padding-bottom: clamp(3rem, 5vw, 5rem);
}
.hero__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
    align-items: center;
}
@media (min-width: 980px) {
    .hero__grid { grid-template-columns: 1.1fr 1fr; gap: 4.5rem; }
}
.hero__eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.35rem 0.85rem;
    border-radius: 999px;
    background: rgba(59,130,246,0.08);
    border: 1px solid rgba(59,130,246,0.30);
    box-shadow: 0 0 28px -8px rgba(59,130,246,0.4);
    font-family: var(--ff-mono);
    font-size: 11px;
    letter-spacing: 0.04em;
    color: #93c5fd;
    margin-bottom: 1.5rem;
}
.hero__title {
    font-size: var(--fs-display);
    font-weight: 600;
    line-height: 1.02;
    letter-spacing: -0.035em;
    margin-bottom: 1.5rem;
}
.hero__title-accent {
    background: linear-gradient(120deg, #60a5fa 0%, #a78bfa 35%, #f0abfc 65%, #60a5fa 100%);
    background-size: 220% 220%;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: aurora-flow 9s ease-in-out infinite;
}
.hero__lede {
    color: var(--c-fg-muted);
    font-size: var(--fs-lede);
    line-height: 1.65;
    max-width: 56ch;
    margin-bottom: 2.25rem;
}
.hero__cta { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-bottom: 2rem; }

.hero__meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1.25rem 1.75rem;
    color: var(--c-fg-dim);
    font-family: var(--ff-mono);
    font-size: 0.72rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}
.hero__meta-item { display: inline-flex; align-items: center; gap: 0.4rem; }
.hero__meta-item i { color: var(--c-accent-soft); font-size: 0.95rem; }

/* Hero illustration */
.hero__viz {
    position: relative;
    aspect-ratio: 1 / 1;
    max-width: 480px;
    margin-inline: auto;
    border-radius: var(--r-2xl);
    overflow: hidden;
    background:
        radial-gradient(ellipse at 30% 20%, rgba(59,130,246,0.18), transparent 60%),
        radial-gradient(ellipse at 70% 80%, rgba(167,139,250,0.18), transparent 60%),
        var(--c-glass);
    border: 1px solid var(--c-border);
    box-shadow: var(--sh-card), 0 40px 80px -40px rgba(59,130,246,0.4);
}
.hero__viz-svg { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.hero__node {
    position: absolute;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.55rem 0.8rem;
    background: var(--c-bg-elev-2);
    border: 1px solid var(--c-border-strong);
    border-radius: var(--r-md);
    font-family: var(--ff-mono);
    font-size: 0.72rem;
    color: var(--c-fg);
    z-index: 2;
    box-shadow: 0 8px 24px -8px rgba(0,0,0,0.6);
}
.hero__node--root {
    padding: 0.5rem;
    background: linear-gradient(135deg, rgba(59,130,246,0.18), rgba(167,139,250,0.18));
    border-color: rgba(96,165,250,0.5);
}
.hero__node-status-pip {
    position: absolute;
    top: -4px; right: -4px;
    width: 11px; height: 11px;
    background: var(--c-success);
    border: 2px solid var(--c-bg-elev-2);
    border-radius: 50%;
    box-shadow: 0 0 12px rgba(34,197,94,0.7);
}
.hero__node--running {
    border-color: rgba(96,165,250,0.55);
    animation: pulse-running 2s infinite;
}
@keyframes pulse-running {
    0%, 100% { box-shadow: 0 8px 24px -8px rgba(0,0,0,0.6), 0 0 0 0 rgba(96,165,250,0.5); }
    50%      { box-shadow: 0 8px 24px -8px rgba(0,0,0,0.6), 0 0 0 8px rgba(96,165,250,0); }
}

.data-stream {
    stroke-dasharray: 6 4;
    animation: flow 1.5s linear infinite;
    fill: none;
}
@keyframes flow { to { stroke-dashoffset: -20; } }

/* Proof strip ---------------------------------------------------------------*/

.proof-strip {
    margin-top: 2rem;
    border-top: 1px solid var(--c-border);
    border-bottom: 1px solid var(--c-border);
    padding-block: 1.5rem;
    background: linear-gradient(to right, transparent, rgba(255,255,255,0.015), transparent);
}
.proof-strip__inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1.5rem 2.25rem;
    justify-content: center;
}
.proof-strip__label {
    font-family: var(--ff-mono);
    font-size: 0.7rem;
    color: var(--c-fg-dim);
    text-transform: uppercase;
    letter-spacing: 0.18em;
}
.proof-strip__item {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--c-fg-muted);
    font-size: 0.85rem;
    font-weight: 500;
}
.proof-strip__item i { color: var(--c-fg-dim); font-size: 1.05rem; }

/* Feature grid (bento) ------------------------------------------------------*/

.features {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.25rem;
}
@media (min-width: 760px) {
    .features {
        grid-template-columns: repeat(6, 1fr);
        grid-auto-rows: minmax(180px, auto);
    }
    .features__wide   { grid-column: span 4; }
    .features__half   { grid-column: span 3; }
    .features__small  { grid-column: span 2; }
    .features__tall   { grid-row: span 2; }
}

.feature__icon {
    width: 42px; height: 42px;
    border-radius: var(--r-md);
    border: 1px solid var(--c-border);
    background: linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.01));
    display: grid; place-items: center;
    margin-bottom: 1rem;
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.08);
}
.feature__title {
    font-family: var(--ff-display);
    font-size: var(--fs-h3);
    font-weight: 600;
    color: var(--c-fg);
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}
.feature__desc {
    font-size: 0.9rem;
    color: var(--c-fg-muted);
    line-height: 1.6;
}

.status-row {
    display: flex; align-items: center; justify-content: space-between;
    padding: 0.5rem 0.85rem;
    border-radius: var(--r-sm);
    font-family: var(--ff-mono);
    font-size: 0.72rem;
    letter-spacing: 0.04em;
}
.status-row--success { background: rgba(34,197,94,0.10);  border: 1px solid rgba(34,197,94,0.25);  color: #86efac; }
.status-row--failure { background: rgba(239,68,68,0.10);  border: 1px solid rgba(239,68,68,0.25);  color: #fca5a5; }
.status-row--running { background: rgba(245,158,11,0.10); border: 1px solid rgba(245,158,11,0.25); color: #fcd34d; }

/* Stat card */
.stat-card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 1rem;
}
.stat-card__value {
    font-family: var(--ff-display);
    font-size: clamp(2.25rem, 3vw + 1rem, 3rem);
    font-weight: 600;
    letter-spacing: -0.04em;
    line-height: 1;
    background: linear-gradient(135deg, #fff 0%, #93c5fd 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.stat-card__label {
    font-family: var(--ff-mono);
    font-size: 0.7rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--c-fg-dim);
}
.stat-card__desc {
    font-size: 0.85rem;
    color: var(--c-fg-muted);
    line-height: 1.55;
}

/* Download grid -------------------------------------------------------------*/

.downloads {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}
.download-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.95rem;
    padding: 1.75rem 1.25rem;
    text-decoration: none;
    color: var(--c-fg);
    cursor: pointer;
}
.download-card__platform-icon {
    width: 60px; height: 60px;
    border-radius: var(--r-lg);
    display: grid; place-items: center;
    background: linear-gradient(135deg, rgba(255,255,255,0.07), rgba(255,255,255,0.02));
    border: 1px solid var(--c-border);
    color: var(--c-fg);
    font-size: 1.85rem;
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.08);
    transition: transform var(--d-base) var(--ease-out);
}
.download-card:hover .download-card__platform-icon { transform: translateY(-2px) scale(1.04); }
.download-card__meta { text-align: center; }
.download-card__meta .name { font-weight: 600; font-size: 0.98rem; }
.download-card__meta .arch {
    font-family: var(--ff-mono);
    font-size: 0.72rem;
    color: var(--c-fg-dim);
    margin-top: 0.2rem;
}

/* Tabs ----------------------------------------------------------------------*/

.tabs {
    display: inline-flex;
    padding: 0.3rem;
    border-radius: var(--r-md);
    border: 1px solid var(--c-border);
    background: var(--c-bg-elev-1);
    gap: 0.15rem;
}
.tab-btn {
    padding: 0.5rem 1.1rem;
    font-family: var(--ff-body);
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: 8px;
    background: transparent;
    color: var(--c-fg-dim);
    border: none;
    cursor: pointer;
    transition: background var(--d-fast), color var(--d-fast);
}
.tab-btn:hover { color: var(--c-fg); }
.tab-btn[aria-selected="true"], .tab-btn.active {
    background: linear-gradient(180deg, rgba(255,255,255,0.10), rgba(255,255,255,0.05));
    color: var(--c-fg);
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.08);
}

.tab-content { display: none; }
.tab-content.active { display: block; animation: fadeIn 0.32s var(--ease-out); }
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* Steps ---------------------------------------------------------------------*/

.steps { display: flex; flex-direction: column; gap: 1.75rem; }
.step { display: flex; gap: 1.15rem; }
.step__num {
    flex-shrink: 0;
    width: 32px; height: 32px;
    border-radius: 50%;
    display: grid; place-items: center;
    background: rgba(59,130,246,0.15);
    border: 1px solid rgba(59,130,246,0.4);
    color: var(--c-accent-soft);
    font-family: var(--ff-mono);
    font-size: 0.78rem;
    font-weight: 700;
    box-shadow: 0 0 0 4px rgba(59,130,246,0.05);
}
.step__num--success {
    background: rgba(34,197,94,0.15);
    border-color: rgba(34,197,94,0.4);
    color: var(--c-success-soft);
    box-shadow: 0 0 0 4px rgba(34,197,94,0.05);
}
.step__body { flex: 1; min-width: 0; }
.step__title {
    font-family: var(--ff-display);
    font-weight: 600;
    font-size: 1.02rem;
    color: var(--c-fg);
    margin-bottom: 0.35rem;
    letter-spacing: -0.015em;
}
.step__hint {
    font-size: 0.88rem;
    color: var(--c-fg-muted);
    margin-bottom: 0.6rem;
    line-height: 1.6;
}

.callout {
    margin-top: 0.5rem;
    padding: 0.8rem 1rem;
    border-radius: var(--r-md);
    background: rgba(59,130,246,0.07);
    border: 1px solid rgba(59,130,246,0.25);
    color: #bfdbfe;
    font-size: 0.82rem;
    line-height: 1.6;
    display: flex;
    align-items: flex-start;
    gap: 0.55rem;
}
.callout i { color: var(--c-accent-soft); flex-shrink: 0; margin-top: 2px; }
.callout--success { background: rgba(34,197,94,0.07); border-color: rgba(34,197,94,0.25); color: #a7f3d0; }
.callout--success i { color: var(--c-success-soft); }

/* Architecture --------------------------------------------------------------*/

.arch {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: stretch;
}
@media (min-width: 880px) {
    .arch { flex-direction: row; align-items: stretch; gap: 0.5rem; }
}
.arch__node {
    flex: 1;
    border-radius: var(--r-xl);
    border: 1px solid var(--c-border);
    border-top-width: 3px;
    background: var(--c-glass);
    backdrop-filter: blur(20px);
    padding: 1.75rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: transform var(--d-base) var(--ease-out), border-color var(--d-base) var(--ease-out);
}
.arch__node:hover {
    transform: translateY(-3px);
    border-color: var(--c-border-active);
}
.arch__node--c   { border-top-color: var(--c-accent-2); }
.arch__node--py  { border-top-color: var(--c-accent); }
.arch__node--web { border-top-color: var(--c-success); }
.arch__node-icon {
    width: 64px; height: 64px;
    border-radius: 50%;
    background: linear-gradient(180deg, #1f1f2e, #0a0a12);
    border: 1px solid var(--c-border-strong);
    display: grid; place-items: center;
    margin-bottom: 1.1rem;
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.06);
}
.arch__node h4 {
    font-family: var(--ff-display);
    font-size: 1.08rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
    letter-spacing: -0.015em;
}
.arch__node p {
    font-size: 0.85rem;
    color: var(--c-fg-muted);
    margin-bottom: 1.1rem;
    line-height: 1.55;
}
.arch__edge {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.5rem 0;
    color: var(--c-fg-dim);
    font-family: var(--ff-mono);
    font-size: 0.7rem;
}
.arch__edge .arrow {
    width: 24px; height: 1px;
    background: linear-gradient(to right, transparent, var(--c-border-strong), transparent);
}
@media (min-width: 880px) {
    .arch__edge { padding: 0 0.25rem; }
    .arch__edge .arrow {
        width: 1px; height: 24px;
        background: linear-gradient(to bottom, transparent, var(--c-border-strong), transparent);
    }
}

/* Protocol table ------------------------------------------------------------*/

.proto-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.85rem;
}
.proto-table th {
    padding: 0.95rem 1.1rem;
    background: rgba(0,0,0,0.45);
    border-bottom: 1px solid var(--c-border);
    color: var(--c-fg-dim);
    font-family: var(--ff-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 500;
}
.proto-table td {
    padding: 0.95rem 1.1rem;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    color: var(--c-fg-muted);
    font-family: var(--ff-mono);
    font-size: 0.8rem;
    vertical-align: top;
}
.proto-table tbody tr:last-child td { border-bottom: none; }
.proto-table tbody tr { transition: background var(--d-fast); }
.proto-table tbody tr:hover { background: rgba(255,255,255,0.025); }
.proto-table .desc { font-family: var(--ff-body); color: var(--c-fg-muted); }

/* Footer --------------------------------------------------------------------*/

.site-footer {
    margin-top: auto;
    border-top: 1px solid var(--c-border);
    background: linear-gradient(to bottom, transparent, rgba(0,0,0,0.4));
    padding-block: 3.5rem;
}
.site-footer__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2.5rem;
}
@media (min-width: 760px) {
    .site-footer__grid { grid-template-columns: 2fr 1fr 1fr; }
}
.site-footer__title {
    font-family: var(--ff-display);
    color: var(--c-fg);
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 1.1rem;
    letter-spacing: -0.01em;
}
.site-footer__list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 0.7rem;
}
.site-footer__list a {
    color: var(--c-fg-muted);
    text-decoration: none;
    font-size: 0.88rem;
    transition: color var(--d-fast);
}
.site-footer__list a:hover { color: var(--c-accent-soft); }
.site-footer__bottom {
    border-top: 1px solid var(--c-border);
    margin-top: 2rem;
    padding-top: 1.5rem;
    color: var(--c-fg-dim);
    font-family: var(--ff-mono);
    font-size: 0.78rem;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
}

/* Utility -------------------------------------------------------------------*/

.visually-hidden {
    clip: rect(0 0 0 0);
    clip-path: inset(50%);
    height: 1px; width: 1px;
    overflow: hidden;
    position: absolute;
    white-space: nowrap;
}

/* ============================================================================
   Animations layer
   ============================================================================ */

/* ── Hero tree tick sequence ──────────────────────────────────────────────── */
.hero__viz .hero__node {
    transition: border-color 380ms var(--ease-out), box-shadow 380ms var(--ease-out), transform 380ms var(--ease-out);
}
.hero__viz .data-stream {
    transition: stroke-opacity 380ms var(--ease-out), stroke-width 380ms var(--ease-out);
    stroke-opacity: 0.45;
}
/* When tick step is "tick-left" — the success leaf is highlighted */
.hero__viz.tick-left .data-stream[data-edge="left"]   { stroke-opacity: 1; stroke-width: 2.4; }
.hero__viz.tick-left .hero__node[data-leaf="left"]    { border-color: rgba(34,197,94,0.65); box-shadow: 0 0 0 6px rgba(34,197,94,0.12), 0 12px 28px -10px rgba(0,0,0,0.65); transform: translateY(-2px); }
.hero__viz.tick-right .data-stream[data-edge="right"] { stroke-opacity: 1; stroke-width: 2.4; }
.hero__viz.tick-right .hero__node[data-leaf="right"]  { border-color: rgba(96,165,250,0.7);  box-shadow: 0 0 0 6px rgba(96,165,250,0.14), 0 12px 28px -10px rgba(0,0,0,0.65); transform: translateY(-2px); }
.hero__viz.tick-root .hero__node--root {
    box-shadow: 0 0 0 6px rgba(96,165,250,0.18), 0 12px 28px -10px rgba(0,0,0,0.65);
    transform: translateX(-50%) translateY(-1px) scale(1.03);
}

/* ── Architecture edge flow ───────────────────────────────────────────────── */
.arch__edge .arrow {
    position: relative;
    overflow: hidden;
}
.arch__edge .arrow::after {
    content: "";
    position: absolute;
    background: linear-gradient(to right, transparent, var(--c-accent-soft), transparent);
    animation: arrow-flow-h 2.4s linear infinite;
}
@media (min-width: 880px) {
    .arch__edge .arrow::after { animation-name: arrow-flow-v; }
}
.arch__edge .arrow::after {
    inset: 0;
}
@keyframes arrow-flow-h {
    0%   { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}
@keyframes arrow-flow-v {
    0%   { transform: translateY(-100%); }
    100% { transform: translateY(100%); }
}

/* ── Proof strip — gentle marquee on smaller screens, static on wide ─────── */
.proof-strip { overflow: hidden; }
.proof-strip__inner {
    flex-wrap: wrap;
}
@media (max-width: 720px) {
    .proof-strip__inner {
        flex-wrap: nowrap;
        animation: marquee 28s linear infinite;
        width: max-content;
    }
    .proof-strip__inner:hover { animation-play-state: paused; }
}
@keyframes marquee {
    0%   { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* ── Code block header shimmer ────────────────────────────────────────────── */
.code-block__header {
    position: relative;
    overflow: hidden;
}
.code-block__header::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(110deg, transparent 35%, rgba(96,165,250,0.12) 50%, transparent 65%);
    transform: translateX(-100%);
    animation: header-sheen 6s ease-in-out infinite;
    pointer-events: none;
}
@keyframes header-sheen {
    0%, 60% { transform: translateX(-100%); }
    80%     { transform: translateX(100%); }
    100%    { transform: translateX(100%); }
}

/* ── Primary button — drifting gradient on hover ──────────────────────────── */
.btn--primary {
    background: linear-gradient(120deg, #4f8bf7 0%, #2563eb 50%, #4f8bf7 100%);
    background-size: 200% 200%;
    background-position: 0% 50%;
    transition:
        background-position 600ms var(--ease-out),
        box-shadow var(--d-fast) var(--ease-out),
        transform var(--d-fast) var(--ease-out);
}
.btn--primary:hover {
    background-position: 100% 50%;
}

/* ── Card sweeping highlight on hover ─────────────────────────────────────── */
.card::after {
    content: "";
    position: absolute;
    top: 0; bottom: 0;
    left: -120%;
    width: 60%;
    background: linear-gradient(110deg, transparent, rgba(255,255,255,0.06), transparent);
    transform: skewX(-18deg);
    transition: left 800ms var(--ease-out);
    pointer-events: none;
    border-radius: inherit;
}
.card:hover::after { left: 130%; }

/* ── Status row — rolling pulse ───────────────────────────────────────────── */
.status-row {
    position: relative;
    overflow: hidden;
}
.status-row::before {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: linear-gradient(110deg, transparent 40%, currentColor 50%, transparent 60%);
    opacity: 0;
    transform: translateX(-100%);
    pointer-events: none;
}
.status-row.is-pulsing::before {
    animation: status-sweep 1.2s ease-out;
}
@keyframes status-sweep {
    0%   { transform: translateX(-100%); opacity: 0;    }
    30%  {                               opacity: 0.18; }
    100% { transform: translateX(100%);  opacity: 0;    }
}

/* ── Stat card — count-up shimmer when revealed ───────────────────────────── */
.stat-card__value {
    background: linear-gradient(120deg, #fff 0%, #93c5fd 35%, #c4b5fd 65%, #fff 100%);
    background-size: 220% 220%;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: aurora-flow 11s ease-in-out infinite;
}

/* ── Hero eyebrow — gentle glow breathing ─────────────────────────────────── */
.hero__eyebrow {
    animation: eyebrow-breathe 4.5s ease-in-out infinite;
}
@keyframes eyebrow-breathe {
    0%, 100% { box-shadow: 0 0 24px -10px rgba(59,130,246,0.4); }
    50%      { box-shadow: 0 0 40px -8px rgba(59,130,246,0.6); }
}

/* ── Architecture nodes — top-bar shimmer ─────────────────────────────────── */
.arch__node {
    position: relative;
    overflow: hidden;
}
.arch__node::before {
    content: "";
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, transparent, currentColor, transparent);
    opacity: 0.45;
    transform: translateX(-100%);
    animation: top-sweep 4s ease-in-out infinite;
}
.arch__node--c::before  { color: var(--c-accent-2); }
.arch__node--py::before { color: var(--c-accent);   animation-delay: 1.2s; }
.arch__node--web::before{ color: var(--c-success);  animation-delay: 2.4s; }
@keyframes top-sweep {
    0%   { transform: translateX(-100%); }
    60%, 100% { transform: translateX(100%); }
}