/* International Software Development — staging site
   Monochrome design ported from isd.co.uk (In Studio Digital) */

:root {
    --black: #0a0a0a;
    --ink: #1a1a1a;
    --grey-900: #2F3337;
    --grey-600: #5b6167;
    --grey-400: #9aa0a6;
    --grey-200: #e6e8ea;
    --grey-100: #f4f5f6;
    --white: #ffffff;
    --accent: #1763ff;
    --accent-dark: #0f47bd;
    --maxw: 1180px;
    --radius: 14px;
    --shadow: 0 18px 50px -20px rgba(0, 0, 0, .28);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    margin: 0;
    font-family: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
    color: var(--ink);
    background: var(--white);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, .brand {
    font-family: "Montserrat", "Inter", sans-serif;
    color: var(--black);
    line-height: 1.12;
    letter-spacing: -.02em;
    margin: 0 0 .5em;
    font-weight: 700;
}

h1 { font-size: clamp(2.3rem, 5vw, 3.6rem); }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.5rem); }
h3 { font-size: 1.2rem; }

p { margin: 0 0 1rem; color: var(--grey-600); }

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-dark); }

img { max-width: 100%; display: block; }

.container {
    width: 100%;
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 0 24px;
}

.eyebrow {
    text-transform: uppercase;
    letter-spacing: .18em;
    font-size: .74rem;
    font-weight: 600;
    color: var(--grey-400);
    margin-bottom: 1rem;
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    padding: .85rem 1.6rem;
    border-radius: 999px;
    font-weight: 600;
    font-size: .95rem;
    border: 1.5px solid var(--black);
    transition: all .18s ease;
    cursor: pointer;
    font-family: inherit;
}
.btn-primary { background: var(--black); color: var(--white); }
.btn-primary:hover { background: var(--accent); border-color: var(--accent); color: #fff; transform: translateY(-2px); }
.btn-ghost { background: transparent; color: var(--black); }
.btn-ghost:hover { background: var(--black); color: #fff; }

/* ---------- Header ---------- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, .82);
    backdrop-filter: saturate(180%) blur(12px);
    border-bottom: 1px solid var(--grey-200);
}
.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 74px;
}
.brand {
    display: flex;
    align-items: center;
    gap: .65rem;
    font-size: 1.15rem;
    font-weight: 800;
    letter-spacing: -.01em;
    color: var(--black);
}
.brand .mark {
    display: inline-grid;
    place-items: center;
    width: 40px; height: 40px;
    background: var(--black);
    color: #fff;
    border-radius: 10px;
    font-size: .85rem;
    letter-spacing: .02em;
}
.brand small { display: block; font-size: .62rem; font-weight: 500; letter-spacing: .16em; color: var(--grey-400); text-transform: uppercase; }
.nav-links { display: flex; align-items: center; gap: 2rem; list-style: none; margin: 0; padding: 0; }
.nav-links a { color: var(--ink); font-weight: 500; font-size: .95rem; }
.nav-links a:hover { color: var(--accent); }
.nav-toggle { display: none; background: none; border: 0; font-size: 1.6rem; cursor: pointer; }

/* ---------- Sections ---------- */
section { padding: 84px 0; }
.section-tight { padding: 56px 0; }
.center { text-align: center; }
.lead { font-size: 1.18rem; color: var(--grey-600); max-width: 640px; }
.center .lead { margin-left: auto; margin-right: auto; }

/* ---------- Hero ---------- */
.hero { padding: 96px 0 72px; }
.hero-grid {
    display: grid;
    grid-template-columns: 1.05fr .95fr;
    gap: 56px;
    align-items: center;
}
.hero h1 span { color: var(--accent); }
.hero-media {
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    aspect-ratio: 4 / 3;
}
.hero-media img { width: 100%; height: 100%; object-fit: cover; }
.hero-cta { display: flex; gap: 1rem; margin-top: 1.6rem; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 2.5rem; margin-top: 2.6rem; flex-wrap: wrap; }
.hero-stats .num { font-family: "Montserrat", sans-serif; font-size: 2rem; font-weight: 800; color: var(--black); }
.hero-stats .lbl { font-size: .82rem; color: var(--grey-400); }

/* ---------- Feature grid ---------- */
.grid { display: grid; gap: 26px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
    background: var(--white);
    border: 1px solid var(--grey-200);
    border-radius: var(--radius);
    padding: 30px;
    transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: transparent; }
.card .icon {
    width: 46px; height: 46px;
    display: grid; place-items: center;
    background: var(--grey-100);
    border-radius: 12px;
    margin-bottom: 16px;
    font-size: 1.3rem;
}
.card h3 { margin-bottom: .4rem; }
.card p { margin: 0; font-size: .95rem; }

/* ---------- Dark band ---------- */
.band-dark { background: var(--grey-900); }
.band-dark h2, .band-dark h3, .band-dark .num { color: #fff; }
.band-dark p, .band-dark .lead { color: rgba(255, 255, 255, .72); }
.band-dark .card { background: rgba(255, 255, 255, .04); border-color: rgba(255, 255, 255, .1); }
.band-dark .card .icon { background: rgba(255, 255, 255, .08); }

/* ---------- Split ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.split img { border-radius: var(--radius); box-shadow: var(--shadow); }

/* ---------- Logos row ---------- */
.logos { display: flex; flex-wrap: wrap; gap: 14px 40px; align-items: center; justify-content: center; }
.logos span { font-family: "Montserrat", sans-serif; font-weight: 700; color: var(--grey-400); font-size: 1.05rem; letter-spacing: .01em; }

/* ---------- CTA banner ---------- */
.cta-banner {
    background: var(--black);
    color: #fff;
    border-radius: 22px;
    padding: 56px;
    text-align: center;
}
.cta-banner h2 { color: #fff; }
.cta-banner p { color: rgba(255, 255, 255, .74); }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: .85rem; font-weight: 600; color: var(--ink); margin-bottom: 6px; }
.field input, .field select, .field textarea {
    width: 100%;
    padding: 12px 14px;
    border: 1.5px solid var(--grey-200);
    border-radius: 10px;
    font-family: inherit;
    font-size: .95rem;
    background: var(--white);
    transition: border-color .15s ease;
}
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--accent); }
.field textarea { min-height: 130px; resize: vertical; }
.field .err { color: #c0392b; font-size: .82rem; margin-top: 4px; }

.alert-success {
    background: #eafaf0;
    border: 1px solid #b6e6c8;
    color: #1c6b3c;
    padding: 16px 20px;
    border-radius: 12px;
    margin-bottom: 24px;
    font-weight: 500;
}

.contact-detail { display: flex; gap: 14px; margin-bottom: 22px; align-items: flex-start; }
.contact-detail .icon { font-size: 1.3rem; }
.contact-detail strong { display: block; color: var(--black); font-family: "Montserrat", sans-serif; }

/* ---------- Footer ---------- */
.site-footer { background: var(--black); color: rgba(255, 255, 255, .7); padding: 64px 0 32px; }
.site-footer h4 { color: #fff; font-size: .8rem; text-transform: uppercase; letter-spacing: .14em; margin-bottom: 1.1rem; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 40px; }
.footer-grid a { color: rgba(255, 255, 255, .7); display: block; padding: 5px 0; font-size: .92rem; }
.footer-grid a:hover { color: #fff; }
.footer-brand p { color: rgba(255, 255, 255, .55); font-size: .92rem; max-width: 280px; }
.footer-bottom {
    margin-top: 48px;
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, .12);
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    font-size: .85rem;
    color: rgba(255, 255, 255, .5);
}

.prose { max-width: 760px; }
.prose h2 { margin-top: 2.2rem; }
.prose ul { color: var(--grey-600); }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
    .hero-grid, .split, .contact-grid { grid-template-columns: 1fr; }
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .nav-links {
        position: absolute;
        top: 74px; left: 0; right: 0;
        flex-direction: column;
        align-items: flex-start;
        gap: 0;
        background: #fff;
        border-bottom: 1px solid var(--grey-200);
        padding: 10px 24px 20px;
        display: none;
    }
    .nav-links.open { display: flex; }
    .nav-links li { width: 100%; padding: 8px 0; }
    .nav-toggle { display: block; }
}
@media (max-width: 560px) {
    .grid-4, .grid-2 { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .cta-banner, .card { padding: 32px 22px; }
}