/* ============================================================
   PostQS - Design System
   Tokens, base, components, layout, pages, motion
   ============================================================ */

/* ---------- Tokens ---------- */
:root {
    /* Brand */
    --brand-50:  #EEF3FF;
    --brand-100: #DCE6FF;
    --brand-200: #B8CCFF;
    --brand-300: #8AAAFF;
    --brand-400: #5A82F8;
    --brand-500: #2F5BEB;
    --brand-600: #1E42D1;
    --brand-700: #1832A8;
    --brand-800: #142785;
    --brand-900: #0E1C5C;

    --accent-400: #38BDF8;
    --accent-500: #06B6D4;

    /* Neutral */
    --ink-950: #06080F;
    --ink-900: #0B1020;
    --ink-800: #111729;
    --ink-700: #1B2238;
    --ink-600: #313A55;
    --ink-500: #4A5470;
    --ink-400: #6B7591;
    --ink-300: #98A1BC;
    --ink-200: #C8CEDF;
    --ink-100: #E5E8F1;
    --ink-50:  #F4F6FB;
    --paper:   #FFFFFF;

    /* Semantic */
    --bg:           var(--paper);
    --bg-soft:      #F8FAFC;
    --bg-muted:     var(--ink-50);
    --bg-invert:    var(--ink-950);
    --bg-deep:      var(--ink-900);
    --surface:      var(--paper);
    --surface-2:    #FBFCFE;
    --border:       #E5E8F1;
    --border-strong:#CBD2E1;
    --border-invert:rgba(255,255,255,0.10);

    --text:         var(--ink-900);
    --text-soft:    var(--ink-500);
    --text-mute:    var(--ink-400);
    --text-invert:  #ECF0F8;
    --text-invert-soft: rgba(236,240,248,0.72);

    --link:         var(--brand-600);
    --link-hover:   var(--brand-700);

    /* Effects */
    --ring:         0 0 0 4px rgba(47,91,235,0.15);
    --shadow-xs:    0 1px 2px rgba(15,23,42,.04);
    --shadow-sm:    0 1px 3px rgba(15,23,42,.06), 0 1px 2px rgba(15,23,42,.04);
    --shadow-md:    0 8px 24px -8px rgba(15,23,42,.10), 0 2px 6px rgba(15,23,42,.05);
    --shadow-lg:    0 24px 48px -16px rgba(15,23,42,.18), 0 6px 12px rgba(15,23,42,.06);
    --shadow-xl:    0 40px 80px -24px rgba(15,23,42,.28);
    --shadow-glow:  0 0 0 1px rgba(47,91,235,.20), 0 24px 48px -16px rgba(47,91,235,.35);

    /* Radii */
    --r-xs: 6px;
    --r-sm: 8px;
    --r-md: 12px;
    --r-lg: 16px;
    --r-xl: 24px;
    --r-2xl: 32px;
    --r-pill: 999px;

    /* Type */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --font-display: 'Space Grotesk', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

    /* Spacing scale (rem) */
    --s-1: .25rem;
    --s-2: .5rem;
    --s-3: .75rem;
    --s-4: 1rem;
    --s-5: 1.25rem;
    --s-6: 1.5rem;
    --s-8: 2rem;
    --s-10: 2.5rem;
    --s-12: 3rem;
    --s-16: 4rem;
    --s-20: 5rem;
    --s-24: 6rem;
    --s-32: 8rem;

    /* Layout */
    --container: 1240px;
    --container-narrow: 860px;
    --nav-h: 72px;

    /* Motion */
    --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
    --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
    --t-fast: 150ms;
    --t-med: 250ms;
    --t-slow: 450ms;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
    font-family: var(--font-sans);
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    overflow-x: hidden;
}
img, svg, video { max-width: 100%; display: block; }
button { font: inherit; color: inherit; cursor: pointer; }
a { color: var(--link); text-decoration: none; transition: color var(--t-fast) var(--ease-out); }
a:hover { color: var(--link-hover); }
input, textarea, select, button { font: inherit; }
::selection { background: rgba(47,91,235,.18); color: var(--ink-900); }

/* ---------- Layout helpers ---------- */
.container {
    width: 100%;
    max-width: var(--container);
    margin: 0 auto;
    padding-inline: var(--s-6);
}
.container.narrow { max-width: var(--container-narrow); }

.section { padding-block: clamp(var(--s-16), 9vw, var(--s-32)); }
.section.compact { padding-block: clamp(var(--s-12), 6vw, var(--s-20)); }
.section.invert {
    background: var(--bg-invert);
    color: var(--text-invert);
    position: relative;
    overflow: hidden;
}
.section.muted { background: var(--bg-soft); }

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: var(--s-2);
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--brand-600);
    padding: 6px 12px;
    background: var(--brand-50);
    border-radius: var(--r-pill);
    margin-bottom: var(--s-5);
}
.section.invert .eyebrow {
    color: var(--accent-400);
    background: rgba(56,189,248,0.10);
    border: 1px solid rgba(56,189,248,0.18);
}
.eyebrow::before {
    content: "";
    width: 6px; height: 6px; border-radius: 50%;
    background: var(--brand-500);
    box-shadow: 0 0 0 3px rgba(47,91,235,.18);
}
.section.invert .eyebrow::before {
    background: var(--accent-400);
    box-shadow: 0 0 0 3px rgba(56,189,248,.20);
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5 {
    font-family: var(--font-display);
    font-weight: 600;
    color: var(--text);
    letter-spacing: -0.02em;
    line-height: 1.1;
    margin: 0 0 var(--s-5);
}
.section.invert h1,
.section.invert h2,
.section.invert h3,
.section.invert h4 { color: var(--text-invert); }

h1, .h1 { font-size: clamp(2.4rem, 5.4vw, 4rem); letter-spacing: -0.025em; line-height: 1.04; }
h2, .h2 { font-size: clamp(1.875rem, 3.4vw, 2.6rem); }
h3, .h3 { font-size: clamp(1.25rem, 1.6vw, 1.5rem); }
h4, .h4 { font-size: 1.125rem; }
.display {
    font-size: clamp(2.6rem, 6.6vw, 5.25rem);
    line-height: 1.02;
    letter-spacing: -0.03em;
    font-weight: 600;
}

p { margin: 0 0 var(--s-4); color: var(--text-soft); }
.section.invert p { color: var(--text-invert-soft); }
.lead {
    font-size: clamp(1.05rem, 1.4vw, 1.2rem);
    line-height: 1.7;
    color: var(--text-soft);
    max-width: 64ch;
}
.section.invert .lead { color: var(--text-invert-soft); }

.text-balance { text-wrap: balance; }
.text-pretty { text-wrap: pretty; }

/* gradient accent text */
.grad-text {
    background: linear-gradient(135deg, var(--brand-500) 0%, var(--accent-500) 100%);
    -webkit-background-clip: text; background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--s-2);
    height: 44px;
    padding: 0 var(--s-5);
    border-radius: var(--r-md);
    font-weight: 500;
    font-size: 15px;
    border: 1px solid transparent;
    background: transparent;
    color: var(--text);
    transition: transform var(--t-fast) var(--ease-out),
                background var(--t-fast) var(--ease-out),
                color var(--t-fast) var(--ease-out),
                box-shadow var(--t-fast) var(--ease-out),
                border-color var(--t-fast) var(--ease-out);
    white-space: nowrap;
    cursor: pointer;
    text-decoration: none;
}
.btn:focus-visible { outline: none; box-shadow: var(--ring); }

.btn-primary {
    background: var(--ink-900);
    color: #fff;
    border-color: var(--ink-900);
}
.btn-primary:hover {
    background: var(--ink-800);
    border-color: var(--ink-800);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}
.section.invert .btn-primary {
    background: #fff;
    color: var(--ink-900);
    border-color: #fff;
}
.section.invert .btn-primary:hover {
    background: var(--ink-50);
    color: var(--ink-900);
    border-color: var(--ink-50);
}

.btn-accent {
    background: linear-gradient(135deg, var(--brand-500), var(--brand-700));
    color: #fff;
    border-color: transparent;
    box-shadow: 0 8px 24px -10px rgba(47,91,235,0.6);
}
.btn-accent:hover {
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 12px 28px -10px rgba(47,91,235,0.7);
}

.btn-secondary {
    background: var(--paper);
    color: var(--text);
    border-color: var(--border-strong);
}
.btn-secondary:hover {
    background: var(--ink-50);
    border-color: var(--ink-200);
    color: var(--text);
}
.section.invert .btn-secondary {
    background: transparent;
    color: var(--text-invert);
    border-color: rgba(255,255,255,0.18);
}
.section.invert .btn-secondary:hover {
    background: rgba(255,255,255,0.06);
    color: #fff;
    border-color: rgba(255,255,255,0.3);
}

.btn-ghost {
    background: transparent;
    color: var(--text);
    border-color: transparent;
}
.btn-ghost:hover { background: var(--ink-50); color: var(--text); }

.btn-lg { height: 52px; padding: 0 var(--s-6); font-size: 16px; }

.btn .ico {
    width: 16px; height: 16px;
    transition: transform var(--t-fast) var(--ease-out);
}
.btn:hover .ico { transform: translateX(2px); }

/* link with arrow */
.text-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-weight: 500;
    color: var(--brand-600);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: gap var(--t-fast) var(--ease-out), color var(--t-fast);
}
.text-link:hover { gap: 10px; color: var(--brand-700); }
.section.invert .text-link { color: var(--accent-400); }
.section.invert .text-link:hover { color: #fff; }

/* ---------- Navbar ---------- */
.nav {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--nav-h);
    background: rgba(255,255,255,0.78);
    backdrop-filter: saturate(180%) blur(14px);
    -webkit-backdrop-filter: saturate(180%) blur(14px);
    border-bottom: 1px solid rgba(15,23,42,0.06);
}
.nav-inner {
    height: 100%;
    display: flex;
    align-items: center;
    gap: var(--s-8);
    max-width: var(--container);
    margin: 0 auto;
    padding-inline: var(--s-6);
}
.brand {
    display: flex; align-items: center; gap: 10px;
    text-decoration: none;
    color: var(--text);
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.125rem;
    letter-spacing: -0.01em;
}
.brand .logo-mark { width: 28px; height: 28px; }
.brand:hover { color: var(--text); }

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--s-2);
    list-style: none;
    margin: 0;
    padding: 0;
    flex: 1;
}
.nav-links > li { position: relative; }
.nav-links a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: 36px;
    padding: 0 12px;
    font-size: 14.5px;
    font-weight: 500;
    color: var(--ink-600);
    border-radius: var(--r-sm);
    text-decoration: none;
    transition: color var(--t-fast), background var(--t-fast);
}
.nav-links a:hover,
.nav-links a.active {
    color: var(--ink-900);
    background: var(--ink-50);
}
.nav-links .chev {
    width: 12px; height: 12px;
    transition: transform var(--t-fast) var(--ease-out);
}
.nav-links li:hover .chev,
.nav-links li:focus-within .chev { transform: rotate(180deg); }

/* dropdown */
.has-dropdown { }
.dropdown {
    position: absolute;
    top: calc(100% + 6px);
    left: -8px;
    min-width: 320px;
    background: var(--paper);
    border: 1px solid var(--border);
    border-radius: var(--r-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--s-3);
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: opacity var(--t-fast) var(--ease-out),
                transform var(--t-fast) var(--ease-out),
                visibility 0s linear var(--t-fast);
    list-style: none;
    margin: 0;
}
.has-dropdown:hover .dropdown,
.has-dropdown:focus-within .dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    transition-delay: 0s;
}
.dropdown a {
    display: flex !important;
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
    padding: 10px 12px;
    height: auto;
    background: transparent;
    border-radius: var(--r-sm);
    color: var(--text);
}
.dropdown a:hover { background: var(--ink-50); }
.dropdown a strong { font-weight: 600; font-size: 14.5px; color: var(--text); }
.dropdown a span { font-size: 13px; color: var(--text-mute); font-weight: 400; }

.nav-cta { display: flex; align-items: center; gap: var(--s-3); }

.nav-toggle {
    display: none;
    width: 40px; height: 40px;
    border-radius: var(--r-sm);
    border: 1px solid var(--border);
    background: var(--paper);
    align-items: center; justify-content: center;
}
.nav-toggle svg { width: 20px; height: 20px; color: var(--text); }

@media (max-width: 980px) {
    .nav-links, .nav-cta { display: none; }
    .nav-toggle { display: inline-flex; }
}

/* mobile menu */
.mobile-menu {
    position: fixed;
    inset: var(--nav-h) 0 0 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(12px);
    z-index: 90;
    padding: var(--s-6);
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform var(--t-med) var(--ease-out);
    visibility: hidden;
}
.mobile-menu.open {
    transform: translateX(0);
    visibility: visible;
}
.mobile-menu ul { list-style: none; padding: 0; margin: 0; }
.mobile-menu li { border-bottom: 1px solid var(--border); }
.mobile-menu a {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--s-4) 0;
    color: var(--text);
    font-size: 18px;
    font-weight: 500;
    text-decoration: none;
}
.mobile-menu .group {
    font-family: var(--font-mono);
    text-transform: uppercase;
    font-size: 11px;
    letter-spacing: 0.12em;
    color: var(--text-mute);
    padding-top: var(--s-6);
    padding-bottom: var(--s-2);
    border: none;
}
.mobile-menu .cta-row {
    display: flex; gap: var(--s-3); margin-top: var(--s-8);
}
.mobile-menu .cta-row .btn { flex: 1; }

/* ---------- Hero ---------- */
.hero {
    position: relative;
    overflow: hidden;
    background: var(--bg-deep);
    color: var(--text-invert);
    isolation: isolate;
    padding-block: clamp(var(--s-20), 12vw, 9rem) clamp(var(--s-16), 9vw, 7rem);
}
.hero::before {
    /* radial spotlight */
    content: "";
    position: absolute; inset: -10% -10% auto -10%; height: 80%;
    background: radial-gradient(60% 60% at 50% 20%, rgba(56,189,248,0.18), transparent 70%),
                radial-gradient(50% 50% at 80% 30%, rgba(47,91,235,0.30), transparent 70%);
    z-index: -2;
}
.hero::after {
    /* grid pattern */
    content: "";
    position: absolute; inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px);
    background-size: 56px 56px;
    mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, #000 30%, transparent 80%);
    -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, #000 30%, transparent 80%);
    z-index: -1;
}
.hero .container { position: relative; z-index: 1; }
.hero-eyebrow {
    color: var(--accent-400);
    background: rgba(56,189,248,0.08);
    border: 1px solid rgba(56,189,248,0.20);
}
.hero h1 {
    color: #fff;
    margin-bottom: var(--s-6);
    max-width: 22ch;
}
.hero p.lead {
    color: rgba(236,240,248,0.75);
    max-width: 60ch;
    margin-bottom: var(--s-10);
}
.hero-cta { display: flex; gap: var(--s-3); flex-wrap: wrap; }
.hero-meta {
    margin-top: var(--s-12);
    display: flex; flex-wrap: wrap; gap: var(--s-8);
    color: rgba(236,240,248,0.55);
    font-size: 14px;
    border-top: 1px solid rgba(255,255,255,0.08);
    padding-top: var(--s-6);
}
.hero-meta strong { color: #fff; font-weight: 600; }

/* hero "platform card" floating mock */
.hero-mock {
    margin-top: var(--s-16);
    border: 1px solid rgba(255,255,255,0.10);
    background: linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.01));
    border-radius: var(--r-xl);
    padding: var(--s-3);
    box-shadow: 0 60px 120px -30px rgba(0,0,0,0.6);
    backdrop-filter: blur(8px);
}
.hero-mock-inner {
    background: linear-gradient(180deg, #0E1530, #0A0F22);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: var(--r-lg);
    padding: var(--s-6);
}

/* ---------- Section heading ---------- */
.section-head { max-width: 760px; margin: 0 auto var(--s-12); text-align: center; }
.section-head.left { margin: 0 0 var(--s-12); text-align: left; }
.section-head h2 { margin-bottom: var(--s-4); }
.section-head p { font-size: 1.0625rem; color: var(--text-soft); }

/* ---------- Card grids ---------- */
.cards { display: grid; gap: var(--s-5); }
.cards.cols-2 { grid-template-columns: repeat(2, minmax(0,1fr)); }
.cards.cols-3 { grid-template-columns: repeat(3, minmax(0,1fr)); }
.cards.cols-4 { grid-template-columns: repeat(4, minmax(0,1fr)); }
@media (max-width: 920px) { .cards.cols-3, .cards.cols-4 { grid-template-columns: repeat(2, minmax(0,1fr)); } }
@media (max-width: 580px) { .cards.cols-2, .cards.cols-3, .cards.cols-4 { grid-template-columns: 1fr; } }

.card {
    position: relative;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--r-lg);
    padding: var(--s-6);
    transition: transform var(--t-med) var(--ease-out),
                border-color var(--t-fast),
                box-shadow var(--t-med) var(--ease-out);
}
.card:hover {
    transform: translateY(-2px);
    border-color: var(--ink-200);
    box-shadow: var(--shadow-md);
}
.card .card-icon {
    width: 40px; height: 40px;
    display: inline-flex; align-items: center; justify-content: center;
    background: var(--brand-50);
    color: var(--brand-600);
    border-radius: var(--r-sm);
    margin-bottom: var(--s-4);
}
.card .card-icon svg { width: 22px; height: 22px; }
.card h3 { margin-bottom: var(--s-2); font-size: 1.125rem; font-weight: 600; }
.card p { color: var(--text-soft); font-size: 15px; margin: 0; }

.section.invert .card {
    background: rgba(255,255,255,0.025);
    border-color: rgba(255,255,255,0.08);
}
.section.invert .card:hover {
    border-color: rgba(255,255,255,0.18);
    background: rgba(255,255,255,0.04);
}
.section.invert .card .card-icon {
    background: rgba(56,189,248,0.10);
    color: var(--accent-400);
}
.section.invert .card h3 { color: #fff; }
.section.invert .card p { color: rgba(236,240,248,0.65); }

/* product card variant */
.prod-card {
    display: flex;
    flex-direction: column;
    padding: var(--s-8);
    height: 100%;
}
.prod-card .badge {
    align-self: flex-start;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--brand-600);
    background: var(--brand-50);
    padding: 4px 10px;
    border-radius: var(--r-pill);
    margin-bottom: var(--s-4);
}
.prod-card h3 { font-size: 1.5rem; }
.prod-card .text-link { margin-top: auto; padding-top: var(--s-5); }

/* feature list with check */
.bullets {
    list-style: none;
    padding: 0;
    margin: var(--s-4) 0 0;
    display: grid;
    gap: var(--s-3);
}
.bullets li {
    position: relative;
    padding-left: 30px;
    color: var(--text-soft);
}
.bullets li::before {
    content: "";
    position: absolute;
    left: 0; top: 6px;
    width: 18px; height: 18px;
    border-radius: 50%;
    background: var(--brand-50);
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%231E42D1' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'><polyline points='20 6 9 17 4 12'/></svg>");
    background-repeat: no-repeat;
    background-position: center;
}
.section.invert .bullets li { color: rgba(236,240,248,0.78); }
.section.invert .bullets li::before {
    background: rgba(56,189,248,0.10);
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2338BDF8' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'><polyline points='20 6 9 17 4 12'/></svg>");
}

/* arrow bullets variant */
.bullets.arrow li::before {
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%231E42D1' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'><line x1='5' y1='12' x2='19' y2='12'/><polyline points='12 5 19 12 12 19'/></svg>");
}

/* ---------- Two-column split ---------- */
.split {
    display: grid;
    grid-template-columns: 1.05fr 1fr;
    gap: var(--s-12);
    align-items: center;
}
.split.right > :first-child { order: 2; }
@media (max-width: 900px) {
    .split { grid-template-columns: 1fr; gap: var(--s-10); }
    .split.right > :first-child { order: 0; }
}

/* ---------- Architecture diagram ---------- */
.diagram {
    background: linear-gradient(180deg, #FBFCFE 0%, #F1F5FA 100%);
    border: 1px solid var(--border);
    border-radius: var(--r-xl);
    padding: var(--s-8);
}
.diagram svg { width: 100%; height: auto; }
.section.invert .diagram {
    background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.005));
    border-color: rgba(255,255,255,0.08);
}

/* ---------- Stat strip ---------- */
.stats {
    display: grid;
    grid-template-columns: repeat(4, minmax(0,1fr));
    gap: var(--s-8);
    padding: var(--s-8) 0;
    border-block: 1px solid var(--border);
}
.stat .num {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(1.75rem, 3.2vw, 2.4rem);
    letter-spacing: -0.02em;
    color: var(--text);
    line-height: 1;
}
.stat .lbl {
    margin-top: 6px;
    font-size: 14px;
    color: var(--text-mute);
}
.section.invert .stats { border-color: rgba(255,255,255,0.08); }
.section.invert .stat .num { color: #fff; }
.section.invert .stat .lbl { color: rgba(236,240,248,0.55); }
@media (max-width: 720px) { .stats { grid-template-columns: repeat(2, minmax(0,1fr)); } }

/* ---------- Pillar list ---------- */
.pillars { display: grid; gap: var(--s-6); grid-template-columns: repeat(2, minmax(0,1fr)); }
@media (max-width: 720px) { .pillars { grid-template-columns: 1fr; } }
.pillar {
    display: grid;
    grid-template-columns: 56px 1fr;
    gap: var(--s-5);
    padding: var(--s-6) 0;
    border-bottom: 1px solid var(--border);
}
.pillar:last-child { border-bottom: 0; }
.pillar .num {
    font-family: var(--font-mono);
    font-size: 14px;
    color: var(--brand-600);
    letter-spacing: 0.08em;
}
.pillar h3 { font-size: 1.125rem; margin-bottom: 6px; }
.pillar p { margin: 0; }
.section.invert .pillar { border-color: rgba(255,255,255,0.08); }
.section.invert .pillar .num { color: var(--accent-400); }

/* ---------- CTA block ---------- */
.cta-block {
    position: relative;
    overflow: hidden;
    border-radius: var(--r-2xl);
    background: linear-gradient(135deg, var(--ink-900) 0%, #142058 60%, #1A2D7C 100%);
    color: #fff;
    padding: clamp(var(--s-10), 6vw, var(--s-20));
    isolation: isolate;
}
.cta-block::before {
    content: "";
    position: absolute; inset: 0;
    background-image:
        radial-gradient(circle at 20% 20%, rgba(56,189,248,0.18), transparent 40%),
        radial-gradient(circle at 80% 80%, rgba(47,91,235,0.30), transparent 40%);
    z-index: -1;
}
.cta-block h2 { color: #fff; margin-bottom: var(--s-4); }
.cta-block p { color: rgba(255,255,255,0.75); max-width: 60ch; margin: 0 auto var(--s-8); }
.cta-block.center { text-align: center; }
.cta-block .btns { display: flex; gap: var(--s-3); flex-wrap: wrap; justify-content: center; }

/* ---------- Page header (sub-pages) ---------- */
.page-head {
    background: var(--bg-deep);
    color: var(--text-invert);
    padding-block: clamp(var(--s-16), 8vw, var(--s-24)) clamp(var(--s-12), 6vw, var(--s-16));
    position: relative;
    overflow: hidden;
    isolation: isolate;
}
.page-head::before {
    content: "";
    position: absolute; inset: 0;
    background:
        radial-gradient(40% 40% at 80% 0%, rgba(56,189,248,0.16), transparent 70%),
        radial-gradient(50% 50% at 0% 100%, rgba(47,91,235,0.20), transparent 70%);
    z-index: -1;
}
.page-head .crumbs {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.10em;
    text-transform: uppercase;
    color: rgba(236,240,248,0.55);
    margin-bottom: var(--s-5);
}
.page-head .crumbs a { color: rgba(236,240,248,0.55); }
.page-head .crumbs a:hover { color: #fff; }
.page-head .crumbs .sep { opacity: 0.4; }
.page-head h1 { color: #fff; margin-bottom: var(--s-5); max-width: 22ch; }
.page-head .lead { color: rgba(236,240,248,0.75); max-width: 60ch; }

/* ---------- Tag ---------- */
.tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    border-radius: var(--r-pill);
    background: var(--ink-50);
    color: var(--ink-700);
    font-family: var(--font-mono);
    font-size: 11.5px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}
.section.invert .tag {
    background: rgba(255,255,255,0.08);
    color: #fff;
}

/* ---------- Code-look snippet ---------- */
.snippet {
    background: var(--ink-950);
    color: #E2E8F0;
    border-radius: var(--r-lg);
    padding: var(--s-5);
    font-family: var(--font-mono);
    font-size: 13.5px;
    line-height: 1.7;
    overflow-x: auto;
    border: 1px solid rgba(255,255,255,0.08);
}
.snippet .c-comment { color: #64748b; }
.snippet .c-key { color: #93C5FD; }
.snippet .c-str { color: #BEF264; }
.snippet .c-num { color: #FCD34D; }

/* ---------- Forms ---------- */
.form {
    display: grid; gap: var(--s-4);
}
.field { display: flex; flex-direction: column; gap: 6px; }
.field label {
    font-size: 13.5px; font-weight: 500; color: var(--text);
}
.field .hint { font-size: 12.5px; color: var(--text-mute); }
.field input,
.field textarea,
.field select {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--border-strong);
    border-radius: var(--r-md);
    background: var(--paper);
    color: var(--text);
    transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.field input:focus,
.field textarea:focus,
.field select:focus {
    outline: none;
    border-color: var(--brand-500);
    box-shadow: var(--ring);
}
.field textarea { resize: vertical; min-height: 140px; }
.row-2 { display: grid; gap: var(--s-4); grid-template-columns: 1fr 1fr; }
@media (max-width: 600px) { .row-2 { grid-template-columns: 1fr; } }

.form-message {
    padding: 12px 14px;
    border-radius: var(--r-md);
    font-size: 14px;
    display: none;
}
.form-message.success {
    background: #ECFDF5; color: #065F46;
    border: 1px solid #A7F3D0;
    display: block;
}
.form-message.error {
    background: #FEF2F2; color: #991B1B;
    border: 1px solid #FECACA;
    display: block;
}

/* ---------- Footer ---------- */
.footer {
    background: var(--bg-invert);
    color: var(--text-invert-soft);
    padding-block: var(--s-20) var(--s-8);
}
.footer .container { display: grid; gap: var(--s-12); }
.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr repeat(4, 1fr);
    gap: var(--s-10);
}
@media (max-width: 900px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .footer-grid { grid-template-columns: 1fr; } }

.footer-brand { display: flex; flex-direction: column; gap: var(--s-4); }
.footer-brand .brand { color: #fff; }
.footer-brand p { color: rgba(236,240,248,0.55); font-size: 14px; max-width: 36ch; }

.footer-col h5 {
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-size: 11.5px;
    font-weight: 500;
    color: rgba(236,240,248,0.45);
    margin-bottom: var(--s-4);
}
.footer-col ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.footer-col a {
    color: rgba(236,240,248,0.78);
    font-size: 14.5px;
    text-decoration: none;
}
.footer-col a:hover { color: #fff; }

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--s-4);
    border-top: 1px solid rgba(255,255,255,0.08);
    padding-top: var(--s-6);
    color: rgba(236,240,248,0.5);
    font-size: 13.5px;
}
.footer-disclosure {
    color: rgba(236,240,248,0.55);
    font-size: 13.5px;
    line-height: 1.7;
    border-top: 1px solid rgba(255,255,255,0.08);
    padding-top: var(--s-6);
    max-width: 80ch;
}

/* ---------- Misc utilities ---------- */
.hidden { display: none !important; }
.center { text-align: center; }
.muted { color: var(--text-mute); }
.divider { height: 1px; background: var(--border); border: 0; }
.section.invert .divider { background: rgba(255,255,255,0.08); }

/* ---------- Reveal-on-scroll ---------- */
.reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--t-slow) var(--ease-out),
                transform var(--t-slow) var(--ease-out);
}
.reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
    .reveal { opacity: 1; transform: none; }
    * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}

/* ---------- Subtle pulse for accent dot ---------- */
@keyframes pulse-dot {
    0%, 100% { box-shadow: 0 0 0 0 rgba(56,189,248,0.55); }
    50%      { box-shadow: 0 0 0 6px rgba(56,189,248,0); }
}
.live-dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--accent-400);
    display: inline-block;
    animation: pulse-dot 2s var(--ease-in-out) infinite;
}

/* ---------- Print ---------- */
@media print {
    .nav, .footer, .cta-block, .hero-cta { display: none !important; }
    .section.invert, .hero, .page-head { background: #fff !important; color: #000 !important; }
}