/* ==========================================================================
   NI18 — Global Styles
   Self-contained Material Design 3 design system (no framework dependency).
   This is the SINGLE source of truth for all pages. Mobile-first & responsive.
   ========================================================================== */

/* ---------- 1. Design Tokens (Material Design 3) ---------- */
:root {
    color-scheme: light dark;

    /* Primary (brand blue) */
    --primary: #0f52ba;
    --on-primary: #ffffff;
    --primary-container: #d8e2ff;
    --on-primary-container: #001a41;

    /* Secondary */
    --secondary: #565f71;
    --on-secondary: #ffffff;
    --secondary-container: #dae2f9;
    --on-secondary-container: #131c2b;

    /* Tertiary */
    --tertiary: #6f5575;
    --on-tertiary: #ffffff;
    --tertiary-container: #f9d8fd;
    --on-tertiary-container: #28132e;

    /* Error */
    --error: #ba1a1a;
    --on-error: #ffffff;
    --error-container: #ffdad6;
    --on-error-container: #410002;

    /* Neutral surfaces */
    --background: #fdfbff;
    --on-background: #1a1b1f;
    --surface: #fdfbff;
    --on-surface: #1a1b1f;
    --surface-variant: #e1e2ec;
    --on-surface-variant: #44474f;

    /* Tonal surface containers (MD3 elevation) */
    --surface-container-lowest: #ffffff;
    --surface-container-low: #f5f3f9;
    --surface-container: #efedf2;
    --surface-container-high: #e9e7ed;
    --surface-container-highest: #e3e2e7;

    /* Outlines & misc */
    --outline: #74777f;
    --outline-variant: #c4c6d0;
    --inverse-surface: #2f3033;
    --inverse-on-surface: #f2f0f4;
    --inverse-primary: #adc6ff;
    --shadow: #000000;

    /* State-layer opacities (MD3) */
    --state-hover: 0.08;
    --state-focus: 0.10;
    --state-press: 0.10;

    /* Shape */
    --radius-xs: 8px;
    --radius-sm: 12px;
    --radius-md: 16px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --radius-full: 999px;

    /* Layout */
    --app-bar-h: 64px;
    --content-max: 1200px;

    /* Elevation (MD3 levels 1-5) */
    --elev-1: 0 1px 2px rgba(0,0,0,.30), 0 1px 3px 1px rgba(0,0,0,.15);
    --elev-2: 0 1px 2px rgba(0,0,0,.30), 0 2px 6px 2px rgba(0,0,0,.15);
    --elev-3: 0 4px 8px 3px rgba(0,0,0,.15), 0 1px 3px rgba(0,0,0,.30);
    --elev-4: 0 6px 10px 4px rgba(0,0,0,.15), 0 2px 3px rgba(0,0,0,.30);
    --elev-5: 0 8px 12px 6px rgba(0,0,0,.15), 0 4px 4px rgba(0,0,0,.30);
}

@media (prefers-color-scheme: dark) {
    :root {
        --primary: #adc6ff;
        --on-primary: #002e69;
        --primary-container: #00468c;
        --on-primary-container: #d8e2ff;

        --secondary: #bec6dc;
        --on-secondary: #283141;
        --secondary-container: #3e4759;
        --on-secondary-container: #dae2f9;

        --tertiary: #dcbce1;
        --on-tertiary: #3f2845;
        --tertiary-container: #573e5c;
        --on-tertiary-container: #f9d8fd;

        --error: #ffb4ab;
        --on-error: #690005;
        --error-container: #93000a;
        --on-error-container: #ffdad6;

        --background: #1a1b1f;
        --on-background: #e3e2e6;
        --surface: #121316;
        --on-surface: #e3e2e6;
        --surface-variant: #44474f;
        --on-surface-variant: #c4c6d0;

        --surface-container-lowest: #0d0e11;
        --surface-container-low: #1a1b1f;
        --surface-container: #1e1f23;
        --surface-container-high: #282a2d;
        --surface-container-highest: #333538;

        --outline: #8e9099;
        --outline-variant: #44474f;
        --inverse-surface: #e3e2e6;
        --inverse-on-surface: #2f3033;
        --inverse-primary: #0f52ba;
    }
}

/* ---------- 2. Reset / Base ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    scroll-padding-top: calc(var(--app-bar-h) + 8px);
}

body {
    font-family: 'Roboto', 'Inter', system-ui, -apple-system, sans-serif;
    margin: 0;
    padding-top: var(--app-bar-h);   /* offset for fixed top app bar */
    overflow-x: hidden;              /* guard against accidental overflow */
    background-color: var(--background);
    color: var(--on-background);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body, button, input, select, textarea, p, span, a, label, li, div {
    font-family: 'Roboto', 'Inter', system-ui, sans-serif;
}

h1, h2, h3, h4, h5, h6, .font-display, .navbar-brand {
    font-family: 'Outfit', 'Inter', sans-serif;
    line-height: 1.2;
    margin: 0;
    letter-spacing: -0.01em;
}

/* MD3-inspired responsive type scale */
h1 { font-size: clamp(2rem, 5.5vw, 3.25rem); line-height: 1.12; font-weight: 700; }
h2 { font-size: clamp(1.6rem, 4.5vw, 2.4rem); line-height: 1.18; font-weight: 700; }
h3 { font-size: clamp(1.35rem, 3.5vw, 1.85rem); line-height: 1.24; font-weight: 600; }
h4 { font-size: clamp(1.2rem, 2.8vw, 1.5rem); font-weight: 600; }
h5 { font-size: clamp(1.05rem, 2.2vw, 1.25rem); font-weight: 600; }
h6 { font-size: clamp(0.95rem, 1.8vw, 1.1rem); font-weight: 600; }

p { margin: 0; }

img, video, svg { max-width: 100%; height: auto; display: block; }

a { color: inherit; text-decoration: none; }

hr { border: 0; border-top: 1px solid var(--outline-variant); }

::selection { background: color-mix(in srgb, var(--primary) 26%, transparent); }

/* ---------- 3. Fixed Top App Bar ---------- */
header.fixed.top {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 50;
    background-color: color-mix(in srgb, var(--surface) 82%, transparent);
    backdrop-filter: saturate(180%) blur(16px);
    -webkit-backdrop-filter: saturate(180%) blur(16px);
    border-bottom: 1px solid var(--outline-variant);
    transition: box-shadow .25s ease, background-color .25s ease;
}
header.fixed.top.scrolled {
    box-shadow: var(--elev-2);
    background-color: color-mix(in srgb, var(--surface-container) 92%, transparent);
}
header.fixed.top nav.responsive {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 8px;
    min-height: var(--app-bar-h);
    max-width: 100%;
    padding: 8px clamp(12px, 3vw, 24px);
    margin: 0 auto;
}
header.fixed.top h5 { font-size: 1.2rem; margin: 0; color: var(--on-surface); }
header.fixed.top a { color: var(--on-surface); }

/* logo bg-white circle in header */
header.fixed.top .circle.bg-white {
    background-color: #fff;
    padding: 2px;
    border: 1px solid var(--outline-variant);
    flex: 0 0 auto;
}

/* nav-link (desktop) */
.nav-link {
    color: var(--on-surface-variant);
    font-weight: 600;
    white-space: nowrap;
}
.nav-link:hover { background-color: color-mix(in srgb, var(--on-surface) 8%, transparent); }
.nav-link.active {
    background-color: var(--secondary-container);
    color: var(--on-secondary-container);
}

/* ---------- 4. Main / Container / Sections ---------- */
main {
    width: 100%;
    max-width: 100%;
    margin: 0 auto;
    padding: clamp(12px, 3vw, 24px);
}
main.responsive {
    margin-left: auto;
    margin-right: auto;
    padding-left: clamp(12px, 3vw, 24px);
    padding-right: clamp(12px, 3vw, 24px);
    max-width: 100%;
}

.container {
    width: 100%;
    max-width: var(--content-max);
    margin-left: auto;
    margin-right: auto;
    padding-left: clamp(12px, 3vw, 24px);
    padding-right: clamp(12px, 3vw, 24px);
}

section { box-sizing: border-box; width: 100%; }

/* ---------- 5. Mobile Navigation Drawer ---------- */
nav.left.drawer {
    position: fixed;
    top: 0; left: 0;
    width: min(86vw, 300px);
    height: 100%;
    height: 100dvh;
    background-color: var(--surface-container-low);
    color: var(--on-surface);
    z-index: 1000;
    transform: translateX(-105%);
    transition: transform .28s cubic-bezier(0.2, 0, 0, 1);
    box-shadow: var(--elev-3);
    display: flex;
    flex-direction: column;
    padding: 12px;
    gap: 4px;
    overflow-y: auto;
    border-top-right-radius: var(--radius-md);
    border-bottom-right-radius: var(--radius-md);
}
nav.left.drawer.active { transform: translateX(0); }
nav.left.drawer > header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 8px 16px;
    border-bottom: 1px solid var(--outline-variant);
    margin-bottom: 8px;
}
nav.left.drawer > header h5 { font-size: 1.2rem; }
.mobile-nav-link {
    display: flex;
    align-items: center;
    gap: 16px;
    min-height: 48px;
    padding: 8px 16px;
    border-radius: var(--radius-full);
    color: var(--on-surface-variant);
    font-weight: 600;
    transition: background-color .15s ease, color .15s ease;
}
.mobile-nav-link:hover { background-color: color-mix(in srgb, var(--on-surface) 8%, transparent); }
.mobile-nav-link.active {
    background-color: var(--secondary-container);
    color: var(--on-secondary-container);
}

/* Drawer scrim */
.overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0,0,0,.45);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: opacity .28s ease, visibility .28s ease;
}
body:has(nav.drawer.active) .overlay { opacity: 1; visibility: visible; }
body:has(nav.drawer.active) { overflow: hidden; }

/* ---------- 6. Responsive Navigation visibility ----------
   Desktop nav appears >= 992px; hamburger appears below.
   md:flex / md:hidden use !important because they share an element with .row
   (which would otherwise win on source order). .hidden stays plain so inline
   JS toggles (e.g. the c-dac loader) can still override it. */
.hidden     { display: none; }
.md\:hidden { display: inline-flex; }
.md\:flex   { display: none !important; }

@media (min-width: 992px) {
    .md\:hidden { display: none !important; }
    .md\:flex   { display: flex !important; }
    header.fixed.top button[onclick*="mobile-menu"] { display: none !important; }
    nav.left.drawer, .overlay { display: none !important; }
}

/* ---------- 7. Grid (12-column, mobile-first) ---------- */
.grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: clamp(12px, 2vw, 24px);
    width: 100%;
}
.grid > * { min-width: 0; }

/* Default span: full width on mobile (matches MD3 stacking) */
[class*="s1"], [class*="s2"], [class*="s3"], [class*="s4"], [class*="s5"],
[class*="s6"], [class*="s7"], [class*="s8"], [class*="s9"] { grid-column: span 12; }
.s1{grid-column:span 1}.s2{grid-column:span 2}.s3{grid-column:span 3}
.s4{grid-column:span 4}.s5{grid-column:span 5}.s6{grid-column:span 6}
.s7{grid-column:span 7}.s8{grid-column:span 8}.s9{grid-column:span 9}
.s10{grid-column:span 10}.s11{grid-column:span 11}.s12{grid-column:span 12}

@media (min-width: 600px) {
    .m1{grid-column:span 1}.m2{grid-column:span 2}.m3{grid-column:span 3}
    .m4{grid-column:span 4}.m5{grid-column:span 5}.m6{grid-column:span 6}
    .m7{grid-column:span 7}.m8{grid-column:span 8}.m9{grid-column:span 9}
    .m10{grid-column:span 10}.m11{grid-column:span 11}.m12{grid-column:span 12}
}
@media (min-width: 992px) {
    .l1{grid-column:span 1}.l2{grid-column:span 2}.l3{grid-column:span 3}
    .l4{grid-column:span 4}.l5{grid-column:span 5}.l6{grid-column:span 6}
    .l7{grid-column:span 7}.l8{grid-column:span 8}.l9{grid-column:span 9}
    .l10{grid-column:span 10}.l11{grid-column:span 11}.l12{grid-column:span 12}
}

/* Fixed-column grid utilities (used in blog content).
   Mobile-first: single column, then expands at the given breakpoint. */
.grid[class*="grid-cols-"] { grid-template-columns: 1fr; }
.grid[class*="grid-cols-"] > * { grid-column: auto; }
.grid.grid-cols-1 { grid-template-columns: 1fr; }
.grid.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
@media (min-width: 640px) {
    .grid.sm\:grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
    .grid.sm\:grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
}

/* ---------- 8. Flex helpers ---------- */
.row { display: flex; flex-direction: row; flex-wrap: wrap; align-items: center; gap: 12px; }
.row.responsive { flex-direction: column; align-items: stretch; }
@media (min-width: 600px) { .row.responsive { flex-direction: row; align-items: center; } }
.vertical, .col, .flex-col { display: flex; flex-direction: column; gap: 8px; }
.flex { display: flex; }
.inline-flex { display: inline-flex; }
.flex-row { flex-direction: row; }
.flex-wrap { flex-wrap: wrap; }
.gap { gap: 12px; }
.gap-1{gap:4px}.gap-2{gap:8px}.gap-3{gap:12px}.gap-4{gap:16px}.gap-6{gap:24px}.gap-8{gap:32px}
.gap-x-8 { column-gap: 32px; }
.space-y-8 > * + * { margin-top: 32px; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.align-center { align-items: center; justify-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-start { justify-content: flex-start; }
.justify-end { justify-content: flex-end; }
.center-align { text-align: center; }
.center-align > * { margin-left: auto; margin-right: auto; }
.max { flex: 1 1 auto; min-width: 0; }
.w-full { width: 100%; }
.h-full { height: 100%; }
.block { display: block; }
.inline-block { display: inline-block; }

/* ---------- 9. Spacing ---------- */
.mx-auto { margin-left: auto; margin-right: auto; }
.margin { margin: 1rem; }
.margin-top { margin-top: 1.5rem; }
.margin-bottom { margin-bottom: 1.5rem; }
.margin-vertical { margin-top: 1.5rem; margin-bottom: 1.5rem; }

.mt-1{margin-top:.25rem}.mt-2{margin-top:.5rem}.mt-3{margin-top:.75rem}.mt-4{margin-top:1rem}.mt-6{margin-top:1.5rem}.mt-8{margin-top:2rem}.mt-10{margin-top:2.5rem}.mt-12{margin-top:3rem}
.mb-1{margin-bottom:.25rem}.mb-2{margin-bottom:.5rem}.mb-3{margin-bottom:.75rem}.mb-4{margin-bottom:1rem}.mb-6{margin-bottom:1.5rem}.mb-8{margin-bottom:2rem}.mb-10{margin-bottom:2.5rem}.mb-12{margin-bottom:3rem}
.mr-2{margin-right:.5rem}.ml-2{margin-left:.5rem}
.mx-2{margin-left:.5rem;margin-right:.5rem}.mx-4{margin-left:1rem;margin-right:1rem}
.my-4{margin-top:1rem;margin-bottom:1rem}.my-5{margin-top:1.25rem;margin-bottom:1.25rem}.my-6{margin-top:1.5rem;margin-bottom:1.5rem}.my-8{margin-top:2rem;margin-bottom:2rem}.my-10{margin-top:2.5rem;margin-bottom:2.5rem}.my-12{margin-top:3rem;margin-bottom:3rem}

.no-padding { padding: 0 !important; }
.p-1{padding:.25rem}.p-2{padding:.5rem}.p-4{padding:1rem}.p-6{padding:1.5rem}.p-8{padding:2rem}.p-10{padding:2.5rem}
.px-2{padding-left:.5rem;padding-right:.5rem}.px-4{padding-left:1rem;padding-right:1rem}.px-6{padding-left:1.5rem;padding-right:1.5rem}.px-8{padding-left:2rem;padding-right:2rem}
.py-2{padding-top:.5rem;padding-bottom:.5rem}.py-3{padding-top:.75rem;padding-bottom:.75rem}.py-4{padding-top:1rem;padding-bottom:1rem}.py-6{padding-top:1.5rem;padding-bottom:1.5rem}.py-8{padding-top:2rem;padding-bottom:2rem}.py-12{padding-top:3rem;padding-bottom:3rem}.py-16{padding-top:4rem;padding-bottom:4rem}.py-20{padding-top:5rem;padding-bottom:5rem}.py-28{padding-top:7rem;padding-bottom:7rem}.py-32{padding-top:8rem;padding-bottom:8rem}
.pt-16{padding-top:4rem}.pb-6{padding-bottom:1.5rem}.padding-top{padding-top:1.5rem}
.padding { padding: clamp(20px, 4vw, 48px); }

/* Responsive padding/size modifiers */
@media (min-width: 600px) {
    .sm\:p-8{padding:2rem}
    .sm\:px-6{padding-left:1.5rem;padding-right:1.5rem}
    .sm\:py-12{padding-top:3rem;padding-bottom:3rem}
    .sm\:py-28{padding-top:7rem;padding-bottom:7rem}
    .sm\:my-12{margin-top:3rem;margin-bottom:3rem}
    .sm\:text-xl{font-size:1.25rem}
    .sm\:text-4xl{font-size:2.25rem}
}
@media (min-width: 768px) {
    .md\:p-10{padding:2.5rem}
    .md\:py-20{padding-top:5rem;padding-bottom:5rem}
    .md\:py-32{padding-top:8rem;padding-bottom:8rem}
    .md\:text-2xl{font-size:1.5rem}
    .md\:text-5xl{font-size:3rem}
}
@media (min-width: 992px) {
    .lg\:px-8{padding-left:2rem;padding-right:2rem}
}

/* ---------- 10. Text utilities ---------- */
.text-xs{font-size:.75rem}
.text-sm{font-size:.875rem}
.text-base{font-size:1rem}
.text-lg{font-size:clamp(1.05rem,1.6vw,1.15rem)}
.text-xl{font-size:clamp(1.15rem,2vw,1.35rem)}
.text-2xl{font-size:clamp(1.35rem,2.5vw,1.6rem)}
.text-3xl{font-size:clamp(1.6rem,3.5vw,2rem)}
.text-4xl{font-size:clamp(1.9rem,4.5vw,2.5rem)}
.text-5xl{font-size:clamp(2.2rem,5.5vw,3.25rem)}
.text-center{text-align:center}.text-left{text-align:left}.text-right{text-align:right}
.align-middle{vertical-align:middle}
.antialiased{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}

.font-light{font-weight:300}.font-normal{font-weight:400}.font-medium{font-weight:500}
.font-semibold{font-weight:600}.font-bold,.bold{font-weight:700}.font-extrabold{font-weight:800}
.uppercase{text-transform:uppercase;letter-spacing:.04em}
.leading-tight{line-height:1.2}.leading-snug{line-height:1.375}.leading-relaxed{line-height:1.7}
.opacity-20{opacity:.2}.opacity-90{opacity:.9}

/* Color helpers */
.primary-text,.text-primary{color:var(--primary)!important}
.text-secondary{color:var(--secondary)!important}
.text-on-primary{color:var(--on-primary)!important}
.text-on-primary-container{color:var(--on-primary-container)!important}
.text-on-secondary-container{color:var(--on-secondary-container)!important}
.text-on-surface{color:var(--on-surface)!important}
.text-on-surface-variant{color:var(--on-surface-variant)!important}
.text-error{color:var(--error)!important}
.text-dark{color:var(--on-surface)!important}
.text-white{color:#fff!important}
.text-gray-400{color:color-mix(in srgb,var(--on-surface-variant) 70%,transparent)}
.text-gray-500{color:var(--on-surface-variant)}
.text-gray-600{color:var(--on-surface-variant)}
.text-gray-700{color:var(--on-surface)}
.text-gray-800{color:var(--on-surface)}
.text-gray-900{color:var(--on-surface)}

/* ---------- 11. Backgrounds & surfaces ---------- */
.bg-white{background-color:#fff}
.bg-gray-50{background-color:var(--surface-container-low)}
.bg-light{background-color:var(--surface-variant)}
.bg-background{background-color:var(--background)}
.bg-surface{background-color:var(--surface)}
.surface{background-color:var(--surface);color:var(--on-surface)}
.surface-variant{background-color:var(--surface-variant);color:var(--on-surface-variant)}
.primary{background-color:var(--primary);color:var(--on-primary)}
.primary-container{background-color:var(--primary-container);color:var(--on-primary-container)}
.secondary-container{background-color:var(--secondary-container);color:var(--on-secondary-container)}
.error-container{background-color:var(--error-container);color:var(--on-error-container)}

/* Gradient utilities */
.bg-gradient-to-r{background-image:linear-gradient(to right,var(--grad-from,var(--primary)),var(--grad-to,var(--secondary)))}
.from-primary{--grad-from:var(--primary)}
.to-secondary{--grad-to:var(--secondary)}

/* ---------- 12. Max-width helpers ---------- */
.max-w-2xl{max-width:42rem;width:100%}
.max-w-3xl{max-width:48rem;width:100%}
.max-w-4xl{max-width:56rem;width:100%}

/* ---------- 13. Radius / elevation / borders ---------- */
.rounded{border-radius:var(--radius-xs)}
.rounded-md,.rounded-lg{border-radius:var(--radius-sm)}
.rounded-xl{border-radius:var(--radius-md)}
/* .round = moderate container radius. Buttons & fields get their pill shape
   from their own (later/more-specific) rules, so they are unaffected. */
.round{border-radius:var(--radius-md)}
.button.round{border-radius:var(--radius-full)}
.round-large{border-radius:var(--radius-md)}
.round-extra-large{border-radius:var(--radius-xl)}
.border-round{border-radius:24px}
.shadow-md{box-shadow:var(--elev-1)}
.shadow-lg{box-shadow:var(--elev-2)}
.shadow-2xl{box-shadow:var(--elev-3)}
.elev-1{box-shadow:var(--elev-1)}
.elev-2{box-shadow:var(--elev-2)}

.border{border:1px solid var(--outline-variant)}
.border-b{border-bottom:1px solid var(--outline-variant)}
.border-t,.border-top{border-top:1px solid var(--outline-variant)}
.border-gray-200{border-color:var(--outline-variant)}
.border-gray-300{border-color:var(--outline)}

/* ---------- 14. Hero / gradients ---------- */
.gradient-overlay-m3 {
    background: linear-gradient(135deg, var(--primary-container), var(--secondary-container));
    color: var(--on-primary-container);
}
[class*="gradient-article-hero"],
.hero-section {
    background: linear-gradient(135deg, #0f52ba, #6a3093);
    color: #fff;
}
.hero-section { padding: clamp(48px,8vw,96px) clamp(16px,4vw,32px); text-align: center; }

/* Cover image inside grid columns */
.cover-img {
    width: 100%;
    height: auto;
    max-height: 480px;
    object-fit: cover;
    border-radius: 24px;
    display: block;
}

/* ---------- 15. Cards ---------- */
article.card, .card {
    background-color: var(--surface-container-low);
    color: var(--on-surface);
    border-radius: var(--radius-lg);
    padding: clamp(16px, 3vw, 28px);
    display: flex;
    flex-direction: column;
    gap: 12px;
    height: 100%;
    transition: transform .2s ease, box-shadow .2s ease;
}
article.card.center-align, .card.center-align { align-items: center; text-align: center; }
.card-hover { transition: transform .2s ease, box-shadow .2s ease; }
.card-hover:hover, article.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--elev-3);
}

/* Service icon "button" — render as a coloured circle */
article.card > button.circle {
    width: 64px; height: 64px;
    border-radius: 50%;
    border: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: default;
    margin-bottom: 8px;
    background-color: var(--primary-container);
    color: var(--on-primary-container);
}
article.card > button.circle i { font-size: 28px; }

/* ---------- 16. Buttons (MD3) ---------- */
.button {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 40px;
    padding: 10px 24px;
    border-radius: var(--radius-full);
    border: 0;
    font-weight: 600;
    font-size: .95rem;
    line-height: 1.2;
    text-decoration: none;
    cursor: pointer;
    background-color: var(--primary);
    color: var(--on-primary);
    transition: box-shadow .15s ease, transform .1s ease, filter .15s ease, background-color .15s ease;
    -webkit-tap-highlight-color: transparent;
    overflow: hidden;
}
.button:hover { box-shadow: var(--elev-1); }
.button:active { transform: scale(.98); }
.button.large { min-height: 48px; padding: 14px 28px; font-size: 1rem; }
.button.outline {
    background: transparent;
    color: var(--primary);
    border: 1.5px solid var(--outline);
}
.button.outline:hover { background-color: color-mix(in srgb, var(--primary) 8%, transparent); box-shadow: none; }
.button.transparent {
    background: transparent;
    color: var(--on-surface);
    box-shadow: none;
}
.button.transparent:hover { background-color: color-mix(in srgb, var(--on-surface) 8%, transparent); box-shadow: none; }
.button.white { background-color: #fff; color: var(--primary); }
.button.circle {
    width: 48px; height: 48px;
    min-height: 48px;
    padding: 0;
    border-radius: 50%;
    flex: 0 0 auto;
}
.button.circle.large { width: 52px; height: 52px; }
.button.responsive { width: 100%; }

/* circle buttons used as icon containers (header/footer/drawer) */
.circle { border-radius: 50%; }
button.circle, a.circle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}
button.circle.transparent, a.circle.transparent { background: transparent; color: var(--on-surface-variant); border: 0; }
button.circle.transparent:hover, a.circle.transparent:hover { background-color: color-mix(in srgb, var(--on-surface) 8%, transparent); }

/* ---------- 17. Form fields (MD3 outlined text field) ---------- */
.field {
    position: relative;
    display: flex;
    flex-direction: column;
    margin: 8px 0;
    width: 100%;
}
.field.label.outline input,
.field.label.outline textarea {
    width: 100%;
    padding: 18px 16px 8px;
    border: 1.5px solid var(--outline);
    border-radius: var(--radius-xs);
    background-color: transparent;
    color: var(--on-surface);
    font-size: 1rem;
    outline: none;
    transition: border-color .15s ease;
    font-family: inherit;
    resize: vertical;
}
.field.round input, .field.round textarea { border-radius: var(--radius-full); }
.field.label.outline textarea { border-radius: var(--radius-sm); }
.field.label.outline input:focus,
.field.label.outline textarea:focus {
    border-color: var(--primary);
    border-width: 2px;
    padding: 17px 15px 7px;
}
.field.label > label {
    position: absolute;
    top: 16px; left: 14px;
    color: var(--on-surface-variant);
    pointer-events: none;
    transition: all .15s ease;
    background-color: transparent;
    padding: 0 4px;
    font-size: 1rem;
}
.field.label.outline input:focus + label,
.field.label.outline input:not(:placeholder-shown) + label,
.field.label.outline textarea:focus + label,
.field.label.outline textarea:not(:placeholder-shown) + label {
    top: -8px;
    font-size: .75rem;
    color: var(--primary);
    background-color: var(--background);
}
.field.prefix input { padding-left: 46px; }
.field.prefix > i:first-child {
    position: absolute;
    left: 14px; top: 18px;
    color: var(--on-surface-variant);
    pointer-events: none;
    z-index: 1;
}
.field.prefix.label > label { left: 42px; }
.field.prefix.label input:focus + label,
.field.prefix.label input:not(:placeholder-shown) + label { left: 14px; }

form.vertical, form.gap { display: flex; flex-direction: column; gap: 12px; }

/* ---------- 18. Material Symbols icon defaults ---------- */
i, .material-symbols-outlined {
    font-family: 'Material Symbols Outlined';
    font-weight: normal;
    font-style: normal;
    font-size: 22px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
    vertical-align: middle;
    font-feature-settings: 'liga';
    -webkit-font-smoothing: antialiased;
    flex: 0 0 auto;
}
/* RemixIcon (used inside some blog content) should keep its own font */
i[class^="ri-"], i[class*=" ri-"] { font-family: 'remixicon' !important; }

/* ---------- 19. Chips ---------- */
.chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    min-height: 32px;
    border-radius: var(--radius-xs);
    background-color: var(--surface-variant);
    color: var(--on-surface-variant);
    font-size: .8rem;
    font-weight: 500;
}

/* ---------- 20. Progress (loader) ---------- */
progress.circle {
    width: 40px; height: 40px;
    border: 4px solid var(--surface-variant);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin .9s linear infinite;
    appearance: none;
    -webkit-appearance: none;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- 21. Footer ---------- */
footer.primary-container {
    margin-top: 4rem;
    padding: clamp(28px, 4vw, 56px) clamp(16px, 3vw, 32px);
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}
footer .grid { gap: clamp(16px, 3vw, 32px); }
footer h5, footer h6 { margin-bottom: 8px; }
footer a {
    color: inherit;
    text-decoration: none;
    padding: 6px 0;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-height: 40px;
}
footer a:hover { color: var(--primary); }
footer nav.vertical { gap: 2px; }
footer hr {
    border: 0;
    border-top: 1px solid color-mix(in srgb, currentColor 24%, transparent);
    margin: 24px 0;
}
footer .justify-between { flex-wrap: wrap; gap: 12px; }
footer .button.circle.transparent { color: inherit; }
@media (max-width: 599px) {
    footer .justify-between { flex-direction: column; align-items: flex-start; text-align: left; }
}

/* ---------- 22. Back-to-top FAB ---------- */
#backToTopBtn {
    position: fixed;
    right: 20px;
    bottom: 20px;
    width: 56px; height: 56px;
    border-radius: var(--radius-md);
    background-color: var(--primary-container);
    color: var(--on-primary-container);
    border: 0;
    box-shadow: var(--elev-3);
    cursor: pointer;
    z-index: 100;
    display: none;
    align-items: center;
    justify-content: center;
}
#backToTopBtn:hover { box-shadow: var(--elev-4); }
.fixed.right.bottom { position: fixed; right: 20px; bottom: 20px; top: auto; left: auto; }

/* ---------- 23. Blog article prose styling ---------- */
.article-content {
    background-color: var(--surface-container-low);
    color: var(--on-surface);
    padding: clamp(20px, 4vw, 48px);
    border-radius: var(--radius-lg);
    box-shadow: var(--elev-1);
    max-width: 56rem;
    margin: 0 auto;
    line-height: 1.75;
    font-size: 1.05rem;
    overflow-wrap: break-word;
}
.article-content h2 {
    margin-top: 2.25em;
    margin-bottom: .9em;
    font-size: clamp(1.5rem, 3.5vw, 1.9rem);
    border-bottom: 2px solid var(--primary);
    padding-bottom: .3em;
}
.article-content h3 { margin-top: 1.75em; margin-bottom: .65em; font-size: clamp(1.25rem, 2.5vw, 1.5rem); }
.article-content h4 { margin-top: 1.4em; margin-bottom: .5em; font-size: 1.15rem; }
.article-content p { margin: 0 0 1.1em; }
.article-content ul, .article-content ol { margin: 0 0 1.2em 1.5em; padding-left: 0; }
.article-content li { margin-bottom: .55em; }
.article-content ul { list-style: disc; }
.article-content ol { list-style: decimal; }
.article-content ul.grid, .article-content ol.grid { list-style: none; margin-left: 0; }
.article-content a {
    color: var(--primary);
    text-decoration: underline;
    text-underline-offset: 2px;
    font-weight: 500;
}
.article-content a:hover { filter: brightness(.85); }
.article-content strong { font-weight: 700; }
.article-content blockquote {
    border-left: 4px solid var(--primary);
    padding: .25em 0 .25em 1rem;
    margin: 1.25em 0;
    font-style: italic;
    color: var(--on-surface-variant);
}
.article-content pre {
    background-color: #1e1e1e;
    color: #f8f8f2;
    padding: 1em;
    border-radius: var(--radius-sm);
    overflow-x: auto;
    margin: 0 0 1.25em;
    font-family: 'Fira Code', 'Courier New', monospace;
    font-size: .92em;
    line-height: 1.6;
}
.article-content code {
    background-color: var(--surface-variant);
    color: var(--on-surface-variant);
    padding: .15em .4em;
    font-size: .9em;
    border-radius: 4px;
    font-family: 'Fira Code', 'Courier New', monospace;
    word-break: break-word;
}
.article-content pre code { background: transparent; padding: 0; color: inherit; font-size: inherit; }
.article-content hr { margin: 2em 0; }
.article-content img,
.inline-article-image {
    max-width: 100%;
    height: auto;
    margin: 1.5em auto;
    display: block;
    border-radius: var(--radius-sm);
    box-shadow: var(--elev-1);
}

/* Custom blog content components */
.section-title {
    margin-top: 1.6em;
    margin-bottom: .6em;
    font-size: clamp(1.5rem, 3.5vw, 1.9rem);
    font-weight: 700;
    color: var(--on-surface);
    border-bottom: 2px solid var(--primary);
    padding-bottom: .3em;
}
.feature-card {
    background-color: var(--surface-container);
    border: 1px solid var(--outline-variant);
    border-radius: var(--radius-md);
    padding: clamp(16px, 3vw, 24px);
}
.feature-card h3, .feature-card h4 { margin-top: 0; }
.comparison-point {
    background-color: var(--surface-container-low);
    border-left: 4px solid var(--primary);
    border-radius: var(--radius-sm);
    padding: clamp(16px, 3vw, 24px);
    margin: 1.25em 0;
}
.roadmap-step {
    background-color: var(--surface-container-low);
    border: 1px solid var(--outline-variant);
    border-radius: var(--radius-md);
    padding: clamp(16px, 3vw, 24px);
    margin: 1.25em 0;
}
.post-footer {
    margin-top: 2em;
    padding-top: 1.5em;
    border-top: 1px solid var(--outline-variant);
}

/* ---------- 24. Sitemap page (best-blogs.html) ---------- */
.sitemap-section { width: 100%; }
.sitemap-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 4px; }
.sitemap-list li a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 4px;
    color: var(--on-surface);
    border-radius: var(--radius-xs);
}
.sitemap-list li a:hover { background-color: color-mix(in srgb, var(--on-surface) 6%, transparent); color: var(--primary); }

/* details / summary (sitemap accordions) */
summary { cursor: pointer; list-style: none; }
summary::-webkit-details-marker { display: none; }
summary.none { list-style: none; }
.no-padding { padding: 0; }
.wave { position: relative; overflow: hidden; }

/* ---------- 25. Misc utilities ---------- */
.relative { position: relative; }
.absolute { position: absolute; }
.inset-0 { inset: 0; }
.z-10 { z-index: 10; }
.z-50 { z-index: 50; }
.top { top: 0; }
.left { left: 0; }
.right { right: 0; }
.bottom { bottom: 0; }
.fixed { position: fixed; }
.fixed.top { top: 0; left: 0; right: 0; }

/* Transition / transform utilities */
.transition-all { transition: all .3s ease; }
.duration-300 { transition-duration: .3s; }
.ease-in-out { transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1); }
.transform { transform: translateZ(0); }
.hover\:scale-105:hover { transform: scale(1.05); }
.hover\:underline:hover { text-decoration: underline; }
.hover\:bg-light:hover { background-color: var(--surface-variant); }

/* Scrollbars */
::-webkit-scrollbar { height: 10px; width: 10px; }
::-webkit-scrollbar-thumb { background: var(--outline-variant); border-radius: 6px; }
::-webkit-scrollbar-thumb:hover { background: var(--outline); }

/* ---------- 26. Accessibility ---------- */
:focus-visible {
    outline: 3px solid color-mix(in srgb, var(--primary) 60%, transparent);
    outline-offset: 2px;
    border-radius: 4px;
}
/* Comfortable touch targets */
button, .button, a.button, .mobile-nav-link, .nav-link { min-height: 40px; }

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: .001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: .001ms !important;
        scroll-behavior: auto !important;
    }
}

/* ---------- 27. Small-screen refinements ---------- */
@media (max-width: 599px) {
    .row.responsive { flex-direction: column; align-items: stretch; }
    .row.responsive > * { width: 100%; }
    section.padding { padding: 28px 18px; }
    main.responsive { padding-left: 14px; padding-right: 14px; }
    .button.large { width: 100%; }      /* full-width primary CTAs on phones */
    nav.center-align .button { width: 100%; }
    article.card nav.center-align .button { width: 100%; }
}

/* Hero vertical sizing safety (kills inline min-height:70vh overflow issues) */
section.gradient-overlay-m3,
section[style*="min-height: 70vh"],
section[style*="min-height: 40vh"] {
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: clamp(40px, 8vw, 96px) clamp(16px, 4vw, 48px);
    min-height: auto !important;
}
section.gradient-overlay-m3 .container { width: 100%; }
nav.center-align { display: flex; justify-content: center; }

/* Article hero banner overlay safety */
#article-hero-banner { position: relative; overflow: hidden; }
#article-hero-banner > .absolute.inset-0 { background: rgba(0,0,0,.15); }