/* =========================================================================
   Neuro Systems - presentation site
   Concept: "Neuro = the nervous system of a company."
   Palette is derived from the logo gradient (gold → sage → teal-green).
   Duotone encodes the two service pillars: teal-green = information systems,
   gold = artificial intelligence. Signals travel the neural mesh.
   ========================================================================= */

:root {
    /* surfaces - warm green-charcoal so the gold end of the logo sits right */
    --ink:       #0A0F0D;   /* base background */
    --ink-2:     #111713;   /* elevated panels / cards */
    --ink-3:     #1A221C;   /* hover / raised */
    --line:      rgba(170, 195, 165, 0.14);
    --line-soft: rgba(170, 195, 165, 0.08);

    /* text */
    --paper:  #EDF0EA;      /* primary text */
    --muted:  #9EA99B;      /* secondary text */
    --faint:  #64715F;      /* tertiary / captions */

    /* accents - sampled from the logo gradient */
    --teal:   #48B394;      /* information systems (cool end of the logo) */
    --gold:   #CBBE6F;      /* artificial intelligence (warm end of the logo) */
    --sage:   #8FB47C;      /* mid tone */
    --teal-dim: rgba(72, 179, 148, 0.14);
    --gold-dim: rgba(203, 190, 111, 0.16);

    --grad: linear-gradient(100deg, var(--gold) 0%, var(--sage) 48%, var(--teal) 100%);

    /* type */
    --font-display: 'Space Grotesk', 'Segoe UI', system-ui, sans-serif;
    --font-body:    'Inter', 'Segoe UI', system-ui, sans-serif;
    --font-mono:    'Space Mono', ui-monospace, 'Cascadia Mono', monospace;

    --nav-h: 74px;
    --maxw:  1180px;
    --radius: 14px;
}

/* ------------------------------ reset --------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--nav-h) + 12px);
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    font-family: var(--font-body);
    font-size: 1.0625rem;
    line-height: 1.7;
    color: var(--paper);
    background: var(--ink);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a   { color: var(--teal); text-decoration: none; transition: color .18s ease; }
a:hover { color: var(--paper); }

h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.08;
    margin: 0;
    letter-spacing: -0.015em;
}

p { margin: 0 0 1rem; }

::selection { background: var(--teal); color: var(--ink); }

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

/* ---------------------------- primitives ------------------------------ */
.container {
    width: 100%;
    max-width: var(--maxw);
    margin-inline: auto;
    padding-inline: clamp(1.25rem, 4vw, 2.5rem);
}

.section { padding-block: clamp(4.5rem, 9vw, 8rem); position: relative; }
.section--tight { padding-block: clamp(3rem, 6vw, 5rem); }

/* mono eyebrow / kicker */
.kicker {
    display: inline-flex;
    align-items: center;
    gap: .6em;
    font-family: var(--font-mono);
    font-size: .72rem;
    letter-spacing: .22em;
    text-transform: uppercase;
    color: var(--faint);
    margin: 0 0 1.4rem;
}
.kicker::before {
    content: "";
    width: 26px; height: 1px;
    background: var(--grad);
}
.kicker--teal   { color: var(--teal); }
.kicker--gold { color: var(--gold); }
.kicker--gold::before { background: var(--gold); }

.section-title {
    font-size: clamp(1.95rem, 3.6vw, 3rem);
    max-width: 18ch;
}
.section-lead {
    color: var(--muted);
    font-size: 1.125rem;
    max-width: 62ch;
    margin-top: 1.4rem;
}

.grad-text {
    background: var(--grad);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

/* buttons */
.btn {
    --btn-fg: #06090F;
    display: inline-flex;
    align-items: center;
    gap: .6em;
    font-family: var(--font-mono);
    font-size: .82rem;
    letter-spacing: .04em;
    padding: .95em 1.6em;
    border-radius: 999px;
    border: 1px solid transparent;
    cursor: pointer;
    transition: transform .18s ease, box-shadow .25s ease, background .2s ease, color .2s ease, border-color .2s ease;
    white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary {
    background: var(--grad);
    color: var(--btn-fg);
    font-weight: 700;
    box-shadow: 0 8px 26px -12px rgba(72, 179, 148, .55);
}
.btn-primary:hover { color: var(--btn-fg); box-shadow: 0 14px 34px -12px rgba(203, 190, 111, .6); }
.btn-ghost {
    background: transparent;
    color: var(--paper);
    border-color: var(--line);
}
.btn-ghost:hover { color: var(--paper); border-color: var(--teal); background: var(--teal-dim); }

/* ============================== NAV =================================== */
.nav {
    position: fixed;
    inset: 0 0 auto 0;
    height: var(--nav-h);
    z-index: 100;
    display: flex;
    align-items: center;
    transition: background .3s ease, border-color .3s ease, backdrop-filter .3s ease;
    border-bottom: 1px solid transparent;
}
.nav.is-scrolled {
    background: rgba(10, 15, 13, 0.82);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom-color: var(--line);
}
/* solid nav on inner pages (no hero) */
body:not(.home) .nav {
    background: rgba(10, 15, 13, 0.9);
    border-bottom-color: var(--line);
}
.nav .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}
.brand {
    display: inline-flex;
    align-items: center;
    gap: .7rem;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.15rem;
    color: var(--paper);
    letter-spacing: -0.02em;
}
.brand:hover { color: var(--paper); }
.brand__logo { height: 46px; width: auto; display: block; }
.footer .brand__logo { height: 54px; }

.nav-links {
    display: flex;
    align-items: center;
    gap: .35rem;
    list-style: none;
    margin: 0; padding: 0;
}
.nav-links a:not(.btn) {
    font-family: var(--font-mono);
    font-size: .78rem;
    letter-spacing: .05em;
    color: var(--muted);
    padding: .5rem .85rem;
    border-radius: 8px;
}
.nav-links a:not(.btn):hover { color: var(--paper); background: var(--ink-3); }
.nav-links .btn { margin-left: .6rem; padding: .6em 1.15em; }

.nav-toggle {
    display: none;
    background: none;
    border: 1px solid var(--line);
    border-radius: 9px;
    width: 42px; height: 42px;
    cursor: pointer;
    padding: 0;
    color: var(--paper);
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
    content: "";
    display: block;
    width: 18px; height: 2px;
    background: currentColor;
    margin-inline: auto;
    transition: transform .25s ease, opacity .2s ease;
}
.nav-toggle span::before { transform: translateY(-6px); }
.nav-toggle span::after  { transform: translateY(4px); }
.nav.is-open .nav-toggle span { background: transparent; }
.nav.is-open .nav-toggle span::before { transform: rotate(45deg); }
.nav.is-open .nav-toggle span::after  { transform: rotate(-45deg) translateY(-1.4px); }

/* ============================== HERO ================================== */
.hero {
    position: relative;
    min-height: 100svh;
    display: flex;
    align-items: center;
    padding-top: calc(var(--nav-h) + 3rem);
    padding-bottom: 5rem;
    overflow: hidden;
    isolation: isolate;
}
#neural {
    position: absolute;
    inset: 0;
    width: 100%; height: 100%;
    z-index: -2;
    opacity: .9;
}
.hero::after { /* vignette so text stays legible over the mesh */
    content: "";
    position: absolute; inset: 0;
    z-index: -1;
    background:
        radial-gradient(120% 90% at 15% 30%, rgba(10,15,13,0) 0%, rgba(10,15,13,.55) 55%, var(--ink) 100%),
        linear-gradient(to bottom, rgba(10,15,13,.2), rgba(10,15,13,.75));
    pointer-events: none;
}

.hero__inner { max-width: 46rem; }
.hero__title {
    font-size: clamp(2.6rem, 6.2vw, 5rem);
    font-weight: 700;
    letter-spacing: -0.03em;
}
.hero__title .line { display: block; }
.hero__sub {
    margin-top: 1.8rem;
    font-size: clamp(1.05rem, 1.6vw, 1.3rem);
    color: var(--muted);
    max-width: 54ch;
}
.hero__cta {
    margin-top: 2.4rem;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}
.hero__pillars {
    margin-top: 3.2rem;
    display: flex;
    flex-wrap: wrap;
    gap: 1.6rem 2.4rem;
    font-family: var(--font-mono);
    font-size: .78rem;
    letter-spacing: .04em;
    color: var(--muted);
}
.hero__pillars .dot {
    display: inline-block;
    width: 8px; height: 8px;
    border-radius: 50%;
    margin-right: .6em;
    vertical-align: middle;
}
.dot--teal   { background: var(--teal);   box-shadow: 0 0 12px 1px var(--teal); }
.dot--gold { background: var(--gold); box-shadow: 0 0 12px 1px var(--gold); }

.scroll-hint {
    position: absolute;
    bottom: 1.6rem; left: 50%;
    transform: translateX(-50%);
    font-family: var(--font-mono);
    font-size: .66rem;
    letter-spacing: .3em;
    text-transform: uppercase;
    color: var(--faint);
    display: flex; flex-direction: column; align-items: center; gap: .5rem;
}
.scroll-hint::after {
    content: "";
    width: 1px; height: 34px;
    background: linear-gradient(var(--faint), transparent);
    animation: hint 2.2s ease-in-out infinite;
}
@keyframes hint { 0%,100%{opacity:.3; transform:scaleY(.6);} 50%{opacity:1; transform:scaleY(1);} }

/* ============================ SERVICES =============================== */
.section-head { max-width: 60rem; margin-bottom: 3.5rem; }

.grid {
    display: grid;
    gap: 1.25rem;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 20rem), 1fr));
}

.card {
    background: var(--ink-2);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 2rem 1.9rem;
    position: relative;
    overflow: hidden;
    transition: transform .25s ease, border-color .25s ease, background .25s ease;
}
.card::before { /* top accent line */
    content: "";
    position: absolute; inset: 0 0 auto 0;
    height: 2px;
    background: var(--grad);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform .4s ease;
}
.card:hover { transform: translateY(-4px); border-color: var(--line); background: var(--ink-3); }
.card:hover::before { transform: scaleX(1); }
.card__idx {
    font-family: var(--font-mono);
    font-size: .72rem;
    color: var(--faint);
    letter-spacing: .1em;
}
.card__icon {
    width: 40px; height: 40px;
    margin-bottom: 1.2rem;
    color: var(--teal);
}
.card__icon svg { width: 100%; height: 100%; display: block; }
.card h3 { font-size: 1.28rem; margin-bottom: .7rem; }
.card p  { color: var(--muted); margin: 0; font-size: .98rem; }

/* ============================== AI ================================== */
.ai {
    background:
        radial-gradient(80% 120% at 100% 0%, var(--gold-dim), transparent 55%),
        radial-gradient(70% 100% at 0% 100%, var(--teal-dim), transparent 55%),
        var(--ink);
    border-block: 1px solid var(--line);
}
.ai__grid {
    display: grid;
    gap: 3rem clamp(2rem, 5vw, 5rem);
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: start;
}
.ai__list { display: grid; gap: 1rem; }
.ai-item {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 1.1rem;
    padding: 1.35rem 1.4rem;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: rgba(16, 22, 34, 0.6);
    transition: border-color .25s ease, background .25s ease;
}
.ai-item:hover { border-color: var(--gold); background: rgba(20, 26, 40, 0.85); }
.ai-item__num {
    font-family: var(--font-mono);
    font-size: .78rem;
    color: var(--gold);
    padding-top: .15rem;
}
.ai-item h4 { font-family: var(--font-display); font-size: 1.08rem; font-weight: 600; margin: 0 0 .3rem; }
.ai-item p  { margin: 0; color: var(--muted); font-size: .95rem; }

.ai__note {
    margin-top: 2rem;
    font-size: .95rem;
    color: var(--muted);
    padding-left: 1.1rem;
    border-left: 2px solid var(--gold);
}

/* ============================ WHY US ================================ */
.why-grid {
    display: grid;
    gap: 1px;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 20rem), 1fr));
    background: var(--line-soft);
    border: 1px solid var(--line-soft);
    border-radius: var(--radius);
    overflow: hidden;
}
.why {
    background: var(--ink);
    padding: 2rem 1.8rem;
    transition: background .25s ease;
}
.why:hover { background: var(--ink-2); }
.why__icon { width: 30px; height: 30px; color: var(--teal); margin-bottom: 1rem; }
.why h3 { font-size: 1.1rem; margin-bottom: .55rem; }
.why p  { color: var(--muted); font-size: .95rem; margin: 0; }

/* ============================ PROJECTS ============================== */
.projects__note {
    font-family: var(--font-mono);
    font-size: .74rem;
    color: var(--faint);
    margin-top: 1.2rem;
    letter-spacing: .03em;
}
.proj-grid {
    display: grid;
    gap: 1.25rem;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 22rem), 1fr));
}
.proj {
    display: flex;
    flex-direction: column;
    background: var(--ink-2);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 1.9rem 1.8rem;
    position: relative;
    overflow: hidden;
    transition: transform .25s ease, border-color .25s ease;
}
.proj:hover { transform: translateY(-4px); border-color: rgba(203,190,111,.4); }
.proj__top {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1.1rem;
}
.proj__idx {
    font-family: var(--font-mono);
    font-size: 2rem;
    line-height: 1;
    color: var(--ink-3);
    -webkit-text-stroke: 1px var(--faint);
    font-weight: 700;
}
.proj__cat {
    font-family: var(--font-mono);
    font-size: .68rem;
    letter-spacing: .14em;
    text-transform: uppercase;
    color: var(--teal);
    text-align: right;
    max-width: 12rem;
}
.proj h3 { font-size: 1.3rem; margin-bottom: .8rem; }
.proj__client {
    display: flex;
    align-items: center;
    gap: .6rem;
    margin: 0 0 1.1rem;
    font-family: var(--font-mono);
    font-size: .84rem;
    color: var(--paper);
}
.proj__client::before {
    content: "Klient";
    flex: none;
    font-size: .58rem;
    letter-spacing: .16em;
    text-transform: uppercase;
    color: var(--teal);
    background: var(--teal-dim);
    border: 1px solid rgba(72, 179, 148, .3);
    border-radius: 5px;
    padding: .3em .5em;
}
.proj__client--own::before { content: "Produkt"; color: var(--gold); background: var(--gold-dim); border-color: rgba(203, 190, 111, .3); }
.proj__desc { color: var(--muted); font-size: .96rem; margin-bottom: 1.2rem; }
.proj__feat {
    list-style: none;
    margin: 0 0 1.4rem;
    padding: 0;
    display: grid;
    gap: .5rem;
}
.proj__feat li {
    position: relative;
    padding-left: 1.3rem;
    font-size: .92rem;
    color: var(--paper);
}
.proj__feat li::before {
    content: "";
    position: absolute;
    left: 0; top: .62em;
    width: 7px; height: 7px;
    border-radius: 2px;
    background: var(--grad);
}
.tags {
    margin-top: auto;
    display: flex;
    flex-wrap: wrap;
    gap: .45rem;
    padding-top: 1rem;
    border-top: 1px solid var(--line-soft);
}
.tag {
    font-family: var(--font-mono);
    font-size: .68rem;
    letter-spacing: .02em;
    color: var(--muted);
    background: var(--ink);
    border: 1px solid var(--line);
    padding: .28em .6em;
    border-radius: 6px;
}

/* ============================== CTA band ============================ */
.cta-band { text-align: center; }
.cta-band .container { max-width: 46rem; }
.cta-band h2 { font-size: clamp(1.9rem, 4vw, 2.8rem); margin-bottom: 1.2rem; }
.cta-band p  { color: var(--muted); font-size: 1.1rem; margin-bottom: 2rem; }

/* ============================== FOOTER ============================== */
.footer {
    background: #070A10;
    border-top: 1px solid var(--line);
    padding-block: clamp(3.5rem, 6vw, 5rem) 2rem;
}
.footer__grid {
    display: grid;
    gap: 2.5rem;
    grid-template-columns: 1.4fr 1fr 1fr;
    margin-bottom: 3rem;
}
.footer h4 {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: .72rem;
    letter-spacing: .18em;
    text-transform: uppercase;
    color: var(--faint);
    margin-bottom: 1.1rem;
}
.footer p, .footer address {
    color: var(--muted);
    font-style: normal;
    font-size: .95rem;
    line-height: 1.8;
    margin: 0;
}
.footer .brand { margin-bottom: 1.2rem; }
.footer__contact a { color: var(--paper); }
.footer__contact a:hover { color: var(--teal); }
.footer__contact .line { display: flex; align-items: center; gap: .6rem; margin-bottom: .5rem; }
.footer__contact .line svg { width: 17px; height: 17px; color: var(--teal); flex: none; }
.footer__bar {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 1rem;
    padding-top: 1.8rem;
    border-top: 1px solid var(--line-soft);
    font-size: .82rem;
    color: var(--faint);
}
.footer__bar nav { display: flex; gap: 1.3rem; flex-wrap: wrap; }
.footer__bar a { color: var(--muted); font-family: var(--font-mono); font-size: .78rem; }

/* ============================ inner page =========================== */
.page {
    padding-top: calc(var(--nav-h) + 4rem);
    padding-bottom: 5rem;
    min-height: 70vh;
}
.page h1 { font-size: clamp(2rem, 4vw, 3rem); margin-bottom: 1.5rem; }

/* ============================= reveal ============================== */
.reveal {
    opacity: 0;
    transform: translateY(26px);
    transition: opacity .7s cubic-bezier(.2,.7,.2,1), transform .7s cubic-bezier(.2,.7,.2,1);
    will-change: opacity, transform;
}
.reveal.is-visible { opacity: 1; transform: none; }
.reveal[data-delay="1"] { transition-delay: .08s; }
.reveal[data-delay="2"] { transition-delay: .16s; }
.reveal[data-delay="3"] { transition-delay: .24s; }

/* ============================ responsive ========================== */
@media (max-width: 860px) {
    .ai__grid { grid-template-columns: 1fr; gap: 2.2rem; }
    .footer__grid { grid-template-columns: 1fr; gap: 2rem; }
}

@media (max-width: 760px) {
    .nav-toggle { display: block; }
    .nav-links {
        position: fixed;
        inset: var(--nav-h) 0 auto 0;
        flex-direction: column;
        align-items: stretch;
        gap: .2rem;
        background: rgba(10, 15, 13, 0.97);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        border-bottom: 1px solid var(--line);
        padding: 1rem clamp(1.25rem, 4vw, 2.5rem) 1.6rem;
        transform: translateY(-140%);
        transition: transform .32s cubic-bezier(.4,0,.2,1);
    }
    .nav.is-open .nav-links { transform: translateY(0); }
    .nav-links a:not(.btn) { padding: .85rem .5rem; font-size: .9rem; }
    .nav-links .btn { margin: .6rem 0 0; justify-content: center; }
    .scroll-hint { display: none; }
}

/* ========================= reduced motion ========================= */
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    * { animation: none !important; transition-duration: .01ms !important; }
    .reveal { opacity: 1; transform: none; }
}