/* ==========================================================================
   Nickel City AI — Industrial WNY design system
   Palette: steel / rust / lake-effect blue / concrete
   ========================================================================== */

:root {
    --steel-900: #14171a;
    --steel-800: #1c2024;
    --steel-700: #262b30;
    --steel-600: #3a4147;
    --steel-400: #6b7580;
    --concrete-100: #f4f2ee;
    --concrete-050: #faf9f6;
    --rust-500: #c1652f;
    --rust-400: #d97b45;
    --lake-500: #3f7ea6;
    --lake-300: #8fc1e0;
    --ink: #14171a;

    --font-display: "Oswald", "Arial Narrow", sans-serif;
    --font-body: "Work Sans", -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: "JetBrains Mono", ui-monospace, monospace;

    --radius: 3px;
    --max-w: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    margin: 0;
    font-family: var(--font-body);
    color: var(--ink);
    background: var(--concrete-050);
    -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

.wrap {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 24px;
}

.eyebrow {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.14em;
    color: var(--lake-300);
    margin: 0 0 14px;
}
.eyebrow--dark { color: var(--rust-500); }

.section-title {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(1.8rem, 3.2vw, 2.6rem);
    line-height: 1.15;
    letter-spacing: -0.01em;
    margin: 0 0 20px;
    color: var(--steel-900);
}
.section-title--light { color: var(--concrete-050); }

/* ---- Reveal-on-scroll ---- */
[data-reveal] {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}
[data-reveal].is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* ---- Buttons ---- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    letter-spacing: 0.04em;
    padding: 12px 22px;
    border-radius: var(--radius);
    border: 1px solid transparent;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}
.btn--lg { padding: 15px 28px; font-size: 0.9rem; }
.btn--rivet {
    background: var(--rust-500);
    color: var(--concrete-050);
    box-shadow: inset 0 0 0 2px rgba(0,0,0,0.15);
}
.btn--rivet:hover { background: var(--rust-400); transform: translateY(-2px); }
.btn--ghost {
    background: transparent;
    color: var(--concrete-050);
    border-color: rgba(250,249,246,0.35);
}
.btn--ghost:hover { border-color: var(--concrete-050); transform: translateY(-2px); }

/* ==========================================================================
   Header
   ========================================================================== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(20,23,26,0.92);
    backdrop-filter: blur(6px);
    border-bottom: 1px solid var(--steel-700);
}
.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}
.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--concrete-050);
}
.brand__mark { color: var(--rust-500); display: flex; }
.brand__text {
    font-family: var(--font-display);
    font-size: 1.05rem;
    letter-spacing: 0.06em;
}
.brand__text strong { color: var(--rust-500); }

.site-nav { display: flex; align-items: center; gap: 28px; }
.site-nav a:not(.btn) {
    color: var(--concrete-100);
    font-size: 0.92rem;
    font-weight: 500;
    position: relative;
}
.site-nav a:not(.btn)::after {
    content: "";
    position: absolute;
    left: 0; bottom: -6px;
    width: 0; height: 2px;
    background: var(--rust-500);
    transition: width 0.2s ease;
}
.site-nav a:not(.btn):hover::after { width: 100%; }

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}
.nav-toggle span { width: 22px; height: 2px; background: var(--concrete-050); }

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
    position: relative;
    background: var(--steel-900);
    color: var(--concrete-050);
    padding: 120px 0 90px;
    overflow: hidden;
}
.hero__grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.045) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.045) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: radial-gradient(ellipse 80% 60% at 50% 20%, black 40%, transparent 90%);
}
.hero__inner { position: relative; max-width: 820px; }
.hero__title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(2.4rem, 5.4vw, 4.1rem);
    line-height: 1.08;
    letter-spacing: -0.01em;
    margin: 0 0 24px;
}
.hero__title .accent { color: var(--rust-500); }
.hero__sub {
    font-size: 1.08rem;
    line-height: 1.65;
    color: var(--concrete-100);
    max-width: 620px;
    margin: 0 0 36px;
}
.hero__actions { display: flex; gap: 16px; flex-wrap: wrap; }

/* ==========================================================================
   Stats
   ========================================================================== */
.stats { background: var(--steel-800); border-top: 1px solid var(--steel-700); border-bottom: 1px solid var(--steel-700); }
.stats__grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    padding: 48px 24px;
}
.stat { text-align: center; color: var(--concrete-050); }
.stat__num, .stat__suffix {
    font-family: var(--font-display);
    font-size: 2.4rem;
    font-weight: 600;
    color: var(--lake-300);
}
.stat__label {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.06em;
    color: var(--concrete-100);
    margin-top: 6px;
}
.stat__label--wide { font-size: 0.82rem; line-height: 1.4; padding-top: 14px; }

/* ==========================================================================
   Services
   ========================================================================== */
.services { background: var(--concrete-050); padding: 96px 0; }
.services__grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2px;
    background: var(--steel-600);
    border: 1px solid var(--steel-600);
    margin-top: 40px;
}
.service-card {
    background: var(--concrete-050);
    padding: 36px;
    position: relative;
    transition: background 0.2s ease;
}
.service-card:hover { background: #fff; }
.service-card__num {
    font-family: var(--font-mono);
    color: var(--rust-500);
    font-size: 0.85rem;
}
.service-card h3 {
    font-family: var(--font-display);
    font-size: 1.3rem;
    margin: 10px 0 12px;
}
.service-card p { color: var(--steel-600); line-height: 1.6; margin: 0; }
.services__more { text-align: center; margin: 40px 0 0; }
.services__more a {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--rust-500);
    border-bottom: 1px solid transparent;
    padding-bottom: 2px;
    transition: border-color 0.2s ease;
}
.services__more a:hover { border-color: var(--rust-500); }

/* ==========================================================================
   Work / Live demos
   ========================================================================== */
.work { background: var(--steel-900); color: var(--concrete-050); padding: 96px 0; }
.work__intro { color: var(--concrete-100); max-width: 560px; margin: -8px 0 40px; }
.work__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}
.work-card {
    background: var(--steel-800);
    border: 1px solid var(--steel-700);
    border-left: 3px solid var(--rust-500);
    padding: 28px;
    color: var(--concrete-050);
    transition: transform 0.2s ease, border-color 0.2s ease;
}
.work-card:hover { transform: translateY(-4px); border-color: var(--lake-500); }
.work-card__tag {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.08em;
    color: var(--lake-300);
}
.work-card h3 { font-family: var(--font-display); margin: 10px 0 10px; font-size: 1.2rem; }
.work-card p { color: var(--concrete-100); line-height: 1.55; font-size: 0.94rem; margin: 0 0 16px; }
.work-card__link { font-family: var(--font-mono); font-size: 0.8rem; color: var(--rust-400); }

/* ==========================================================================
   About
   ========================================================================== */
.about { background: var(--concrete-100); padding: 96px 0; }
.about__grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 48px;
    align-items: start;
}
.about p { line-height: 1.7; color: var(--steel-600); }
.about__badges {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}
.badge {
    background: var(--concrete-050);
    border: 1px solid var(--steel-600);
    padding: 18px 14px;
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.02em;
    color: var(--steel-900);
}

/* ==========================================================================
   Blog cards (home latest + archive)
   ========================================================================== */
.latest { background: var(--steel-900); padding: 96px 0; }
.latest__grid, .archive-list .latest__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}
.post-card {
    background: var(--concrete-050);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: transform 0.2s ease;
}
.post-card:hover { transform: translateY(-4px); }
.post-card__img { height: 160px; background-size: cover; background-position: center; background-color: var(--steel-600); }
.post-card__body { padding: 22px; }
.post-card__body h3 { font-family: var(--font-display); font-size: 1.1rem; margin: 0 0 8px; color: var(--steel-900); }
.post-card__body p { color: var(--steel-600); font-size: 0.92rem; line-height: 1.55; margin: 0 0 12px; }
.post-card__date { font-family: var(--font-mono); font-size: 0.72rem; color: var(--rust-500); }

/* ==========================================================================
   Contact
   ========================================================================== */
.contact { background: var(--rust-500); color: var(--concrete-050); padding: 90px 0; }
.contact__inner { text-align: center; max-width: 640px; margin: 0 auto; }
.contact .eyebrow--dark { color: rgba(20,23,26,0.55); }
.contact .section-title { color: var(--concrete-050); }
.contact__sub { line-height: 1.6; margin-bottom: 32px; color: rgba(250,249,246,0.9); }
.contact .btn--rivet { background: var(--steel-900); }
.contact .btn--rivet:hover { background: var(--steel-800); }

/* ==========================================================================
   Archive / single page / post
   ========================================================================== */
.archive-header, .page__header, .post__header { background: var(--steel-900); color: var(--concrete-050); padding: 90px 0 50px; }
.page__content, .post__content { padding: 48px 0 80px; line-height: 1.75; font-size: 1.05rem; }
.page__content img, .post__content img { border-radius: var(--radius); margin: 24px 0; }

/* Koenig editor image-width classes -- required by Ghost's theme validator
   even before any post actually uses a wide/full-width image. */
.kg-width-wide {
    width: 100%;
    max-width: calc(var(--max-w) + 240px);
    margin-left: 50%;
    transform: translateX(-50%);
}
.kg-width-full {
    width: 100vw;
    max-width: 100vw;
    margin-left: 50%;
    transform: translateX(-50%);
}
.post__meta { font-family: var(--font-mono); font-size: 0.8rem; color: var(--concrete-100); display: flex; gap: 10px; }
.post__feature { margin-top: -30px; }
.page__feature-image { margin-top: 20px; border-radius: var(--radius); max-width: 100%; }
.post-cta { background: var(--steel-800); padding: 64px 0; text-align: center; }
.post-cta h2 { font-family: var(--font-display); color: var(--concrete-050); margin-bottom: 20px; }

.error-page { padding: 140px 0; text-align: center; }
.error-page p { max-width: 480px; margin: 0 auto 28px; color: var(--steel-600); }

/* ==========================================================================
   Use Cases page
   ========================================================================== */
.usecases__intro {
    color: var(--concrete-100);
    max-width: 640px;
    margin: 0;
    line-height: 1.6;
}
.usecases { background: var(--concrete-050); padding: 80px 0 96px; }
.usecases__list { display: flex; flex-direction: column; }
.usecase-block {
    display: grid;
    grid-template-columns: 90px 1fr;
    gap: 28px;
    padding: 40px 0;
    border-bottom: 1px solid var(--concrete-100);
}
.usecase-block:first-child { padding-top: 0; }
.usecase-block:last-child { border-bottom: none; }
.usecase-block__num {
    font-family: var(--font-display);
    font-size: 2.2rem;
    font-weight: 600;
    color: var(--rust-500);
    line-height: 1;
}
.usecase-block__body h2 {
    font-family: var(--font-display);
    font-size: 1.4rem;
    margin: 0 0 12px;
    color: var(--steel-900);
}
.usecase-block__body > p {
    color: var(--steel-600);
    line-height: 1.65;
    margin: 0 0 16px;
    max-width: 680px;
}
.usecase-block__list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.usecase-block__list li {
    position: relative;
    padding-left: 22px;
    color: var(--steel-600);
    line-height: 1.55;
    max-width: 680px;
}
.usecase-block__list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 9px;
    width: 8px;
    height: 8px;
    background: var(--lake-500);
}

@media (max-width: 640px) {
    .usecase-block { grid-template-columns: 1fr; gap: 8px; }
}

/* ==========================================================================
   Footer
   ========================================================================== */
.rivet-strip {
    height: 6px;
    background: repeating-linear-gradient(90deg, var(--rust-500) 0 18px, var(--steel-700) 18px 36px);
}
.site-footer { background: var(--steel-900); color: var(--concrete-100); }
.site-footer__inner {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 40px;
    padding: 56px 24px 32px;
}
.site-footer__brand p { color: var(--steel-400); max-width: 360px; margin-top: 12px; line-height: 1.6; }
.site-footer__cols { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.site-footer__cols h4 { font-family: var(--font-mono); font-size: 0.75rem; letter-spacing: 0.08em; color: var(--lake-300); margin: 0 0 12px; }
.site-footer__cols a { display: block; color: var(--concrete-100); margin-bottom: 8px; font-size: 0.92rem; }
.site-footer__legal {
    display: flex;
    justify-content: space-between;
    padding: 18px 24px;
    border-top: 1px solid var(--steel-700);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--steel-400);
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 860px) {
    .site-nav { display: none; }
    .nav-toggle { display: flex; }
    .stats__grid { grid-template-columns: repeat(2, 1fr); }
    .services__grid { grid-template-columns: 1fr; }
    .about__grid { grid-template-columns: 1fr; }
    .about__badges { grid-template-columns: 1fr 1fr; }
    .site-footer__inner { grid-template-columns: 1fr; }
    .site-footer__legal { flex-direction: column; gap: 6px; }
}