@charset "UTF-8";

/* ============================================================
   DESIGN TOKENS
   Graphite surfaces, teal accent, violet glow. Dark mode is the
   primary design; light mode swaps the same tokens.
   ============================================================ */
:root {
    --accent: #0d9488;
    --accent-strong: #0f766e;
    --accent-soft: rgba(13, 148, 136, 0.12);
    --accent-rgb: 13, 148, 136;
    --accent-2: #7c3aed;
    --accent-2-rgb: 124, 58, 237;
    --on-accent: #ffffff;

    --bg: #f7f9fb;
    --bg-alt: #eef2f6;
    --surface: #ffffff;
    --surface-2: #f3f6f9;
    --border: rgba(15, 23, 42, 0.1);
    --border-strong: rgba(15, 23, 42, 0.18);
    --text: #334155;
    --text-muted: #64748b;
    --heading: #0f172a;
    --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.05), 0 4px 16px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 12px 40px rgba(15, 23, 42, 0.12);
    --glow: 0 0 0 1px rgba(var(--accent-rgb), 0.35), 0 10px 40px rgba(var(--accent-rgb), 0.18);
    --nav-bg: rgba(247, 249, 251, 0.75);
    --grid-line: rgba(15, 23, 42, 0.05);

    --font-heading: "Space Grotesk", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    --radius: 1.125rem;
    --radius-sm: 0.75rem;
    --nav-height: 4.25rem;

    /* Bootstrap overrides */
    --bs-primary: var(--accent);
    --bs-primary-rgb: var(--accent-rgb);
    --bs-body-font-family: var(--font-body);
    --bs-body-color: var(--text);
    --bs-body-bg: var(--bg);
    --bs-link-color: var(--accent);
    --bs-link-hover-color: var(--accent-strong);
    --bs-border-radius: var(--radius-sm);
    --bs-font-monospace: var(--font-mono);
}

[data-bs-theme="dark"] {
    --accent: #2dd4bf;
    --accent-strong: #5eead4;
    --accent-soft: rgba(45, 212, 191, 0.12);
    --accent-rgb: 45, 212, 191;
    --accent-2: #a78bfa;
    --accent-2-rgb: 167, 139, 250;
    --on-accent: #042f2e;

    --bg: #0a0e14;
    --bg-alt: #0d1219;
    --surface: #121823;
    --surface-2: #171f2c;
    --border: rgba(148, 163, 184, 0.12);
    --border-strong: rgba(148, 163, 184, 0.24);
    --text: #c3cdd9;
    --text-muted: #8494a7;
    --heading: #f1f5f9;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4), 0 4px 16px rgba(0, 0, 0, 0.35);
    --shadow-md: 0 16px 48px rgba(0, 0, 0, 0.55);
    --glow: 0 0 0 1px rgba(var(--accent-rgb), 0.4), 0 10px 50px rgba(var(--accent-rgb), 0.16);
    --nav-bg: rgba(10, 14, 20, 0.72);
    --grid-line: rgba(148, 163, 184, 0.06);

    --bs-primary: var(--accent);
    --bs-primary-rgb: var(--accent-rgb);
    --bs-body-color: var(--text);
    --bs-body-bg: var(--bg);
    --bs-link-color: var(--accent);
    --bs-link-hover-color: var(--accent-strong);
}

/* Aliases used by the AI page and blog stylesheets */
:root, [data-bs-theme="dark"] {
    --surface-raised: var(--surface);
    --surface-alt: var(--surface-2);
    --brand: var(--accent);
    --brand-700: var(--accent-strong);
    --gradient-brand: linear-gradient(120deg, var(--accent), var(--accent-2));
}

@property --angle {
    syntax: "<angle>";
    inherits: false;
    initial-value: 0deg;
}

/* ============================================================
   BASE
   ============================================================ */
html {
    height: 100%;
    scroll-padding-top: calc(var(--nav-height) + 1rem);
    scroll-behavior: smooth;
}

body {
    display: flex;
    flex-flow: column;
    min-height: 100%;
    background: var(--bs-body-bg);
    color: var(--bs-body-color);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    overflow-x: clip;
}

main { flex: 1 0 auto; }

h1, h2, h3, h4, h5, h6, .h1, .h2, .h3, .h4, .h5, .h6 {
    margin-top: 0;
    margin-bottom: 0.5rem;
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.02em;
    color: var(--heading);
}

code, kbd, pre { font-family: var(--font-mono); }

::selection { background: var(--accent); color: var(--on-accent); }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

.skip-link {
    position: absolute;
    top: -100%;
    left: 1rem;
    z-index: 2000;
    padding: 0.5rem 1rem;
    background: var(--accent);
    color: var(--on-accent);
    border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}
.skip-link:focus { top: 0; color: var(--on-accent); }

/* Reading progress bar driven purely by CSS scroll timelines. */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1100;
    height: 2px;
    width: 100%;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    transform-origin: 0 50%;
    transform: scaleX(0);
    pointer-events: none;
}
@supports (animation-timeline: scroll()) {
    .scroll-progress { animation: grow-x linear both; animation-timeline: scroll(root); }
}
@keyframes grow-x { from { transform: scaleX(0); } to { transform: scaleX(1); } }

/* ---------- Buttons ---------- */
.btn {
    font-family: var(--font-heading);
    font-weight: 600;
    letter-spacing: 0.01em;
    border-radius: 999px;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
    --bs-btn-bg: var(--accent);
    --bs-btn-border-color: var(--accent);
    --bs-btn-color: var(--on-accent);
    --bs-btn-hover-bg: var(--accent-strong);
    --bs-btn-hover-border-color: var(--accent-strong);
    --bs-btn-hover-color: var(--on-accent);
    --bs-btn-active-bg: var(--accent-strong);
    --bs-btn-active-border-color: var(--accent-strong);
    --bs-btn-active-color: var(--on-accent);
}
.btn-primary:hover { box-shadow: 0 8px 30px rgba(var(--accent-rgb), 0.35); transform: translateY(-2px); }
.btn-outline-primary {
    --bs-btn-color: var(--heading);
    --bs-btn-border-color: var(--border-strong);
    --bs-btn-hover-bg: var(--accent-soft);
    --bs-btn-hover-border-color: var(--accent);
    --bs-btn-hover-color: var(--heading);
    --bs-btn-active-bg: var(--accent-soft);
    --bs-btn-active-border-color: var(--accent);
    --bs-btn-active-color: var(--heading);
}
.btn-secondary {
    --bs-btn-bg: var(--surface-2);
    --bs-btn-border-color: var(--border-strong);
    --bs-btn-color: var(--heading);
    --bs-btn-hover-bg: var(--surface);
    --bs-btn-hover-border-color: var(--accent);
    --bs-btn-hover-color: var(--heading);
}

/* ============================================================
   NAVBAR
   ============================================================ */
#mainNav {
    padding-top: 0.9rem;
    padding-bottom: 0.9rem;
    font-family: var(--font-heading);
    font-weight: 600;
    background: var(--nav-bg);
    backdrop-filter: blur(16px) saturate(1.4);
    -webkit-backdrop-filter: blur(16px) saturate(1.4);
    border-bottom: 1px solid transparent;
    transition: padding 0.3s ease, border-color 0.3s ease, background-color 0.3s ease;
}
#mainNav.navbar-shrink { border-bottom-color: var(--border); }

#mainNav .navbar-brand {
    color: var(--heading);
    font-size: 1.05rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}
#mainNav .navbar-brand::before {
    content: "";
    width: 0.55rem;
    height: 0.55rem;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 0 4px var(--accent-soft);
}
@media (prefers-reduced-motion: no-preference) {
    #mainNav .navbar-brand::before { animation: pulse 2.4s ease-in-out infinite; }
}
@keyframes pulse {
    0%, 100% { box-shadow: 0 0 0 3px var(--accent-soft); }
    50% { box-shadow: 0 0 0 7px rgba(var(--accent-rgb), 0.05); }
}
#mainNav .navbar-brand:hover { color: var(--accent); }

#mainNav .navbar-nav { margin-top: 0.75rem; }
#mainNav .navbar-nav .nav-link {
    position: relative;
    color: var(--text-muted);
    padding: 0.6rem 0;
    font-size: 0.9rem;
    transition: color 0.2s ease;
}
#mainNav .navbar-nav .nav-link:hover,
#mainNav .navbar-nav .nav-link:focus-visible,
#mainNav .navbar-nav .nav-link.active { color: var(--heading); }

#mainNav .navbar-toggler {
    border: 1px solid var(--border-strong);
    color: var(--heading);
    padding: 0.45rem 0.7rem;
    border-radius: var(--radius-sm);
}
#mainNav .navbar-toggler:focus { box-shadow: 0 0 0 0.2rem var(--accent-soft); }

.theme-toggle {
    width: 2.4rem;
    height: 2.4rem;
    border-radius: 50%;
    border: 1px solid var(--border-strong);
    background: var(--surface);
    color: var(--heading);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s ease, transform 0.3s ease, border-color 0.2s ease;
}
.theme-toggle:hover { border-color: var(--accent); transform: rotate(20deg); }
.theme-toggle .fa-sun { display: none; }
[data-bs-theme="dark"] .theme-toggle .fa-sun { display: inline-block; }
[data-bs-theme="dark"] .theme-toggle .fa-moon { display: none; }

@media (min-width: 1200px) {
    #mainNav .navbar-nav { margin-top: 0; }
    #mainNav .navbar-nav .nav-link { padding: 0.5rem 0.75rem; margin: 0 0.1rem; font-size: 0.85rem; }
    #mainNav .navbar-nav .nav-link::after {
        content: "";
        position: absolute;
        left: 0.75rem;
        right: 0.75rem;
        bottom: 0.2rem;
        height: 2px;
        border-radius: 2px;
        background: var(--accent);
        transform: scaleX(0);
        transform-origin: 0 50%;
        transition: transform 0.25s ease;
    }
    #mainNav .navbar-nav .nav-link:hover::after,
    #mainNav .navbar-nav .nav-link.active::after { transform: scaleX(1); }
    #mainNav.navbar-shrink { padding-top: 0.5rem; padding-bottom: 0.5rem; }
}

/* ============================================================
   SECTIONS (shared by every page)
   ============================================================ */
.page-section { padding: 5rem 0; position: relative; }
.page-section .container { position: relative; z-index: 1; }
.section-alt { background: var(--bg-alt); }

/* Faint engineering grid behind alternate sections */
.section-grid::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(var(--grid-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, #000 30%, transparent 100%);
    -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, #000 30%, transparent 100%);
    pointer-events: none;
}

main { counter-reset: section; }
.page-section:has(.section-eyebrow) { counter-increment: section; }
.section-eyebrow .num::before { content: counter(section, decimal-leading-zero); }
.section-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 0.9rem;
}
.section-eyebrow::before {
    content: "";
    width: 1.5rem;
    height: 1px;
    background: currentColor;
    opacity: 0.7;
}
.page-section-heading {
    font-size: clamp(1.9rem, 3.5vw, 2.75rem);
    line-height: 1.1;
    margin-bottom: 2rem;
    font-weight: 700;
}
.section-header { margin-bottom: 2.5rem; }
.section-header.text-center .section-eyebrow::after {
    content: "";
    width: 1.5rem;
    height: 1px;
    background: currentColor;
    opacity: 0.7;
}
.section-header .page-section-heading { margin-bottom: 0; }

@media (min-width: 992px) {
    .page-section { padding: 6.5rem 0; }
}

/* Legacy divider kept for the AI page */
.divider-custom { display: none; }

/* Rich text */
.about-text { font-size: 1.1rem; line-height: 1.8; color: var(--text); }
.about-text p { margin-bottom: 1.4rem; }
.about-text p:last-child { margin-bottom: 0; }
.about-text strong, .about-text b { color: var(--heading); font-weight: 600; }
.about-text ul, .about-text ol { margin-bottom: 1.4rem; padding-left: 1.4rem; }
.about-text li { margin-bottom: 0.5rem; }
.about-text a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }

/* ---------- Cards and spotlight hover ---------- */
.card-surface {
    position: relative;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 0.3s ease, border-color 0.3s ease;
}
.card-surface:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--border-strong); }
[data-spotlight] { --mx: 50%; --my: 50%; }
[data-spotlight]::before {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: radial-gradient(360px circle at var(--mx) var(--my), rgba(var(--accent-rgb), 0.14), transparent 45%);
    opacity: 0;
    transition: opacity 0.35s ease;
    pointer-events: none;
}
[data-spotlight]:hover::before { opacity: 1; }
[data-spotlight] > * { position: relative; }

.narrow-text { max-width: 38rem; }

/* Simple pages: search, 404, thank-you */
.simple-page { padding-top: calc(var(--nav-height) + 4rem); min-height: 70vh; }
.simple-page-icon { font-size: 3.5rem; color: var(--accent); margin-bottom: 1rem; }
.error-code {
    font-family: var(--font-heading);
    font-size: clamp(5rem, 18vw, 9rem);
    font-weight: 700;
    line-height: 1;
    margin: 0;
    background: linear-gradient(120deg, var(--accent), var(--accent-2));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.search-results .search-result {
    padding: 1rem 1.25rem;
    margin-bottom: 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface);
}

/* Forms */
.form-control {
    background: var(--surface-2);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.8rem 1rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.form-control::placeholder { color: var(--text-muted); }
.form-control:focus {
    background: var(--surface-2);
    color: var(--text);
    border-color: var(--accent);
    box-shadow: 0 0 0 0.25rem rgba(var(--accent-rgb), 0.18);
}
.form-label { font-weight: 600; color: var(--heading); font-size: 0.9rem; }

/* ============================================================
   REVEAL ON SCROLL
   Scroll-driven CSS animation where supported, IntersectionObserver
   fallback (adds .is-visible) elsewhere. Disabled for reduced motion.
   ============================================================ */
@media (prefers-reduced-motion: no-preference) {
    .js [data-reveal] {
        opacity: 0;
        transform: translateY(28px);
        transition: opacity 0.7s cubic-bezier(0.2, 0.8, 0.2, 1), transform 0.7s cubic-bezier(0.2, 0.8, 0.2, 1);
    }
    .js [data-reveal].is-visible { opacity: 1; transform: none; }

    @supports (animation-timeline: view()) {
        .js [data-reveal], .js [data-reveal].is-visible {
            opacity: 1;
            transform: none;
            transition: none;
            animation: reveal-up linear both;
            animation-timeline: view();
            animation-range: entry 0% entry 35%;
        }
    }
}
@keyframes reveal-up {
    from { opacity: 0; transform: translateY(28px); }
    to { opacity: 1; transform: none; }
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
    padding: 3rem 0;
    background: var(--bg-alt);
    color: var(--text-muted);
    border-top: 1px solid var(--border);
}
.footer-brand {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--heading);
    text-decoration: none;
}
.footer-brand:hover { color: var(--accent); }
.footer-copyright { font-size: 0.85rem; margin-top: 0.3rem; }
.footer-copyright p { margin: 0; }
.footer-social { display: inline-flex; gap: 0.5rem; }
.btn-social {
    width: 2.6rem;
    height: 2.6rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    border: 1px solid var(--border-strong);
    color: var(--heading);
    font-size: 1rem;
    transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease, color 0.2s ease;
}
.btn-social:hover { background: var(--accent); border-color: var(--accent); color: var(--on-accent); transform: translateY(-2px); }
.footer-link {
    color: var(--text-muted);
    text-decoration: none;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}
.footer-link:hover { color: var(--accent); }
.standard-body h2, .standard-body h3 { margin-top: 2rem; font-size: 1.35rem; }
.footer-egg { opacity: 0.35; transition: opacity 0.2s ease; margin-left: 0.5rem; }
.footer-egg:hover { opacity: 1; }