/**
 * KhomDev shared layout — tokens, nav, footer, buttons, section primitives.
 * Load after page-local <style>, before site-premium.css.
 */

:root {
    --bg: #070b14;
    --bg-rgb: 7, 11, 20;
    --surface: #121a2e;
    --surface-2: #1a2438;
    --border: #243049;
    --border-dim: #1a2438;
    --text: #f0f4fc;
    --text-muted: #94a3b8;
    --text-dim: #64748b;
    --accent: #22d3ee;
    --accent-bright: #67e8f9;
    --accent-dim: rgba(34, 211, 238, 0.10);
    --accent-muted: #67e8f9;
    --accent-glow: rgba(34, 211, 238, 0.22);
    --amber: #F59E0B;
    --warm: #f97316;
    --warm-dim: rgba(249, 115, 22, 0.12);
    --warm-glow: rgba(249, 115, 22, 0.35);
    --red: #EF4444;
    --green: #34d399;

    --nav-glass: rgba(var(--bg-rgb), 0.80);
    --nav-glass-scrolled: rgba(var(--bg-rgb), 0.94);

    --font-display: 'Fragment Mono', monospace;
    --font-body: 'DM Sans', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --font-hero: var(--font-body);

    --fs-hero: clamp(2.6rem, 6vw, 4.5rem);
    --fs-h2: clamp(1.9rem, 3.5vw, 2.6rem);
    --fs-h3: clamp(1.2rem, 2vw, 1.5rem);
    --fs-lead: clamp(1.05rem, 1.6vw, 1.35rem);
    --fs-body: 1.0625rem;
    --fs-mono-lbl: 0.8rem;
    --measure: 66ch;

    --container-max: 1200px;
    --section-gap: clamp(6rem, 10vw, 9rem);
    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --ease-out: cubic-bezier(0.4, 0, 0.2, 1);
    --duration-fast: 0.15s;
    --duration-normal: 0.2s;
    --radius-sm: 4px;
    --z-nav: 1000;
    --z-mobile-nav: 1100;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html {
    scroll-behavior: smooth;
    background-color: var(--bg);
}

body {
    font-family: var(--font-body);
    color: var(--text);
    line-height: 1.6;
    letter-spacing: 0.01em;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    background-color: transparent;
    background-image: linear-gradient(180deg, var(--bg) 0%, #0a0f1a 50%, var(--bg) 100%);
    background-attachment: fixed;
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition);
}

:focus-visible {
    outline: 2px solid var(--warm);
    outline-offset: 3px;
    border-radius: 2px;
}

.btn:focus-visible,
.nav-cta:focus-visible,
.service-cta:focus-visible,
.bp-cta:focus-visible,
.faq-q:focus-visible,
.mobile-menu-btn:focus-visible {
    outline-offset: 4px;
}

ul { list-style: none; }

h1, h2 {
    font-family: var(--font-display);
    font-weight: 400;
    letter-spacing: -0.02em;
}

h3, h4 {
    font-family: var(--font-body);
    font-weight: 500;
    letter-spacing: -0.01em;
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 2rem;
}

.container--narrow { max-width: 800px; }

/* --- Icons --- */
i[data-lucide] { display: inline-flex; }
i[data-lucide] > svg { width: 1em; height: 1em; }
.logo i[data-lucide] > svg { width: 1.1em; height: 1.1em; }

/* --- Site header --- */
nav.site-header,
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: var(--z-nav);
    padding: 1.5rem 0;
    background: var(--nav-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-dim);
    transition: padding var(--transition), background var(--transition), border-color var(--transition);
}

nav.site-header.scrolled,
.site-header.scrolled {
    padding: 0.85rem 0;
    background: var(--nav-glass-scrolled);
    border-bottom-color: var(--border);
}

.nav-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.logo {
    font-family: var(--font-display);
    font-size: 1.25rem;
    color: var(--accent);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
}

.nav-right,
.nav-actions {
    display: flex;
    align-items: center;
    gap: 1.75rem;
}

.nav-links {
    display: flex;
    gap: 1.6rem;
}

.nav-links a {
    font-family: var(--font-display);
    font-size: 0.82rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    white-space: nowrap;
}

.nav-cta {
    font-family: var(--font-display);
    font-size: 0.85rem;
    padding: 0.55rem 1.25rem;
    background: var(--warm);
    color: var(--bg);
    border: 1px solid var(--warm);
    border-radius: var(--radius-sm);
    white-space: nowrap;
}

.nav-cta:hover {
    background: transparent;
    color: var(--warm);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text);
    cursor: pointer;
    padding: 0.25rem;
}

/* Project / contact subnav */
.back-link,
.btn-back {
    font-family: var(--font-display);
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.back-link:hover,
.btn-back:hover { color: var(--accent); }

nav.nav-sub {
    position: sticky;
    top: 0;
    z-index: var(--z-nav);
    padding: 1.5rem 0;
    background: var(--nav-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-dim);
    transition: padding var(--transition), background var(--transition), border-color var(--transition);
}

nav.nav-sub.scrolled {
    padding: 0.85rem 0;
    background: var(--nav-glass-scrolled);
    border-bottom-color: var(--border);
}

nav.nav-sub .mobile-menu-btn { display: none; }

@media (max-width: 768px) {
    nav.nav-sub .nav-sub-desktop,
    nav.nav-sub .nav-links,
    nav.nav-sub .nav-cta { display: none; }
    nav.nav-sub .mobile-menu-btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }
    nav.nav-sub .nav-inner { gap: 0.5rem; }
}

/* --- Mobile nav overlay --- */
.mobile-nav {
    position: fixed;
    inset: 0;
    z-index: var(--z-mobile-nav);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 2.5rem;
    background: rgba(var(--bg-rgb), 0.98);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    transform: translateY(-100%);
    visibility: hidden;
    opacity: 0;
    pointer-events: none;
    transition:
        transform var(--duration-normal) var(--ease-out),
        opacity var(--duration-normal) var(--ease-out),
        visibility 0s linear var(--duration-normal);
}

.mobile-nav.active,
.mobile-nav.is-open {
    transform: translateY(0);
    visibility: visible;
    opacity: 1;
    pointer-events: auto;
    transition-delay: 0s;
}

.mobile-nav a {
    font-family: var(--font-display);
    font-size: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-muted);
    padding: 0.75rem 2rem;
}

.mobile-nav a:hover { color: var(--warm); }

/* --- Buttons --- */
.btn {
    padding: 0.8rem 2rem;
    font-family: var(--font-display);
    font-size: 0.9rem;
    border: 1px solid var(--border);
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.btn-primary {
    background: var(--warm);
    color: var(--bg);
    border-color: var(--warm);
}

.btn-primary:hover {
    background: transparent;
    color: var(--warm);
}

.btn-secondary:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* --- Section primitives --- */
.section-label {
    font-family: var(--font-display);
    font-size: var(--fs-mono-lbl);
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.14em;
    display: block;
    margin-bottom: 1rem;
    text-shadow: 0 0 28px var(--accent-glow);
}

.section-heading {
    font-size: var(--fs-h2);
    line-height: 1.1;
    margin-bottom: 1rem;
}

.section-subheading,
.lead {
    font-size: var(--fs-lead);
    color: var(--text-muted);
    max-width: var(--measure);
    line-height: 1.65;
}

footer {
    padding: 4rem 0;
    border-top: 1px solid var(--border-dim);
    margin-top: 5rem;
}

body:has(.page-wrap) footer {
    margin-top: 2rem;
    padding-top: 3rem;
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.copyright {
    font-family: var(--font-display);
    color: var(--text-dim);
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.footer-links a {
    font-family: var(--font-display);
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.footer-links a:hover { color: var(--text); }

.footer-legal-note {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-dim);
    margin: 0 0 1rem;
    line-height: 1.5;
}

.footer-pay,
.kh-pay-foot {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    flex-wrap: wrap;
    margin-top: 1rem;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-muted);
}

.footer-pay code,
.kh-pay-foot code { color: var(--text); word-break: break-all; }

.kh-pay-mini-copy {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-family: var(--font-mono);
    font-size: 0.68rem;
    background: transparent;
    color: var(--accent);
    border: 1px solid var(--accent);
    border-radius: 6px;
    padding: 3px 9px;
    cursor: pointer;
    transition: var(--transition);
}

.kh-pay-mini-copy:hover { filter: brightness(1.12); }

/* --- Mobile sticky CTA --- */
.mobile-cta-bar { display: none; }

/* --- Page offset for fixed header --- */
.has-fixed-header { padding-top: 100px; }
.has-fixed-header--tight { padding-top: 88px; }

/* --- Responsive nav --- */
@media (max-width: 768px) {
    .nav-links { display: none; }
    .mobile-menu-btn { display: flex; align-items: center; justify-content: center; }
    .nav-cta { display: none; }
    .nav-right { gap: 0; }

    .mobile-cta-bar {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 1rem;
        position: fixed;
        left: 0;
        right: 0;
        bottom: 0;
        z-index: calc(var(--z-nav) + 1);
        padding: 0.75rem 1.25rem;
        padding-bottom: calc(0.75rem + env(safe-area-inset-bottom, 0px));
        background: rgba(var(--bg-rgb), 0.96);
        backdrop-filter: blur(12px);
        border-top: 1px solid var(--border);
        transition: transform var(--transition), opacity var(--transition);
    }

    .mobile-cta-bar.is-hidden {
        transform: translateY(130%);
        opacity: 0;
        pointer-events: none;
    }

    .mobile-cta-text {
        display: flex;
        flex-direction: column;
        line-height: 1.3;
        min-width: 0;
    }

    .mobile-cta-text strong {
        font-family: var(--font-display);
        font-weight: 400;
        font-size: 0.9rem;
        color: var(--text);
    }

    .mobile-cta-text span {
        font-family: var(--font-mono);
        font-size: 0.68rem;
        color: var(--text-muted);
    }

    .mobile-cta-btn {
        font-family: var(--font-display);
        font-size: 0.85rem;
        padding: 0.65rem 1.1rem;
        background: var(--warm);
        color: var(--bg);
        border: 1px solid var(--warm);
        border-radius: var(--radius-sm);
        white-space: nowrap;
        flex-shrink: 0;
    }

    .mobile-cta-btn:hover {
        background: transparent;
        color: var(--warm);
    }

    body.has-mobile-cta footer { margin-bottom: 4.5rem; }

    .footer-inner {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 400px) {
    html, body { overflow-x: hidden; word-break: break-word; overflow-wrap: break-word; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
}

/* --- Agent offer ($299) — index + products --- */
.agent-offer-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-top: 2px solid var(--warm);
    padding: 2rem;
    max-width: 720px;
    margin: 0 auto;
    border-radius: var(--radius-sm);
}

.agent-offer-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin-bottom: 1.25rem;
}

.agent-offer-price {
    font-family: var(--font-display);
    font-size: 2rem;
    color: var(--warm);
}

.agent-offer-price-sub {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-dim);
}

.agent-offer-checklist {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem 1.5rem;
    margin-bottom: 1rem;
    list-style: none;
}

.agent-offer-checklist li {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.agent-offer-checklist li::before {
    content: "▸";
    color: var(--warm);
    flex-shrink: 0;
}

.agent-offer-footnote {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-dim);
    max-width: var(--measure);
}

.agent-offer-examples {
    text-align: center;
    margin-top: 2rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.agent-offer-link {
    text-align: center;
    margin-top: 2rem;
}

.agent-offer-link a {
    font-family: var(--font-display);
    font-size: 0.85rem;
    color: var(--accent);
    border-bottom: 1px solid var(--accent-dim);
}

@media (max-width: 768px) {
    .agent-offer-checklist { grid-template-columns: 1fr; }
}

/* 404 page */
.not-found-page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.not-found {
    flex: 1;
    display: flex;
    align-items: center;
    padding: clamp(4rem, 12vh, 8rem) 0;
}

.not-found-inner {
    text-align: center;
    max-width: 36rem;
    margin: 0 auto;
}

.not-found-code {
    font-family: var(--font-mono);
    font-size: clamp(4rem, 14vw, 7rem);
    font-weight: 500;
    line-height: 1;
    color: var(--border);
    margin: 0 0 1rem;
    letter-spacing: -0.04em;
}

.not-found h1 {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    margin: 0 0 0.75rem;
}

.not-found-lead {
    color: var(--text-muted);
    margin: 0 0 2rem;
    line-height: 1.6;
}

.not-found-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
}

.not-found-actions .btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

.not-found-actions .btn i {
    width: 1rem;
    height: 1rem;
}