/* ============================================================
   ANT BYTE — style.css
   Design system: tokens, layout, and components.
   Naming: BEM-inspired, grouped by section.
   ============================================================ */

/* --- Design tokens ------------------------------------------------ */
:root{
  /* Brand — pulled directly from the ANT BYTE logo */
  --brand:#d0193c; --brand-deep:#a8122e; --brand-soft:rgba(208,25,60,.14);
  --accent:#1c4e86;               /* circuit-blue from the ant's joints, used sparingly */
  --ink:#0e1119; --surface:#161b26; --surface-2:#1d2331; --border:#2a3342;
  --text:#f4f2ee; --muted:#98a1b2;
  --success:#4caf7d; --warning:#e6b345; --danger:#e5634d;
  --r:16px; --r-lg:22px;
  --sp:clamp(1.2rem,4vw,2rem);
  --shadow:0 24px 60px -20px rgba(0,0,0,.72);
  --t:.4s cubic-bezier(.2,.7,.2,1);
  --f-display:'Space Grotesk',sans-serif;
  --f-body:'Inter',sans-serif;
  --f-mono:'Space Mono',monospace;
}
[data-theme="light"]{
  --ink:#f6f4ef; --surface:#ffffff; --surface-2:#f0ede6; --border:#e2ddd3;
  --text:#141a26; --muted:#5c6472; --shadow:0 24px 60px -24px rgba(20,26,38,.18);
}

/* --- Base --------------------------------------------------------- */
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--f-body);background:var(--ink);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}
h1,h2,h3{font-family:var(--f-display);font-weight:600;line-height:1.05;letter-spacing:-.02em}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
:focus-visible{outline:2px solid var(--brand);outline-offset:3px;border-radius:4px}

/* --- Layout helpers ---------------------------------------------- */
.wrap{max-width:1160px;margin:0 auto;padding:0 var(--sp)}
.eyebrow{font-family:var(--f-mono);font-size:.72rem;letter-spacing:.24em;text-transform:uppercase;color:var(--brand)}
section{padding:clamp(4rem,9vw,7rem) 0}
.grid{display:grid;gap:1.2rem}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.head{max-width:640px;margin-bottom:3rem}
.head h2{font-size:clamp(1.9rem,4.5vw,3rem);margin:.8rem 0}
.head p{color:var(--muted)}

/* --- Buttons ------------------------------------------------------ */
.btn{display:inline-flex;align-items:center;gap:.5rem;font-weight:600;font-size:.95rem;padding:.85rem 1.5rem;border-radius:999px;border:1px solid transparent;cursor:pointer;transition:var(--t);position:relative;overflow:hidden}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 30px -8px var(--brand-soft),0 0 0 4px var(--brand-soft)}
.btn-ghost{border-color:var(--border);color:var(--text);background:transparent}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand)}

/* --- Header / nav ------------------------------------------------- */
header{position:fixed;top:0;left:0;right:0;z-index:50;transition:var(--t)}
header.scrolled{background:color-mix(in srgb,var(--ink) 82%,transparent);backdrop-filter:blur(14px);border-bottom:1px solid var(--border)}
.nav{display:flex;align-items:center;justify-content:space-between;height:72px}
.logo{display:flex;align-items:center;gap:.6rem}
.logo img{height:34px;width:auto;display:block}
.logo--footer img{height:30px}
/* Theme-aware logo: white mark on dark, full colour on light */
.logo .on-dark{display:block}
.logo .on-light{display:none}
[data-theme="light"] .logo .on-dark{display:none}
[data-theme="light"] .logo .on-light{display:block}
.nav-links{display:flex;gap:2rem;align-items:center}
.nav-links a{font-size:.92rem;color:var(--muted);transition:var(--t)}
.nav-links a:hover{color:var(--text)}
.nav-tools{display:flex;gap:.7rem;align-items:center}
.icon-btn{width:40px;height:40px;border-radius:12px;border:1px solid var(--border);background:transparent;color:var(--text);cursor:pointer;display:grid;place-items:center;transition:var(--t)}
.icon-btn:hover{border-color:var(--brand);color:var(--brand)}
.burger{display:none}

/* --- Hero --------------------------------------------------------- */
.hero{position:relative;padding-top:clamp(8rem,16vw,11rem);padding-bottom:clamp(4rem,8vw,6rem);overflow:hidden}
#swarm{position:absolute;inset:0;width:100%;height:100%;z-index:0;opacity:.9}
.hero-inner{position:relative;z-index:2;max-width:820px}
.hero h1{font-size:clamp(2.6rem,7vw,5rem);font-weight:700}
.hero h1 .hl{color:var(--brand)}
.hero p.lead{font-size:clamp(1.05rem,2.2vw,1.3rem);color:var(--muted);max-width:560px;margin:1.5rem 0 2.2rem}
.hero-cta{display:flex;gap:1rem;flex-wrap:wrap}
.hero-strip{display:flex;gap:2.4rem;flex-wrap:wrap;margin-top:3.5rem;position:relative;z-index:2}
.hero-strip div span{display:block;font-family:var(--f-display);font-size:1.9rem;font-weight:700;color:var(--text)}
.hero-strip div small{font-family:var(--f-mono);font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}

/* --- Cards -------------------------------------------------------- */
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);padding:1.8rem;transition:var(--t);position:relative;overflow:hidden}
.card:hover{transform:translateY(-6px);border-color:color-mix(in srgb,var(--brand) 55%,var(--border));box-shadow:var(--shadow)}
.card .ic{width:46px;height:46px;border-radius:12px;background:var(--brand-soft);color:var(--brand);display:grid;place-items:center;font-family:var(--f-mono);font-weight:700;margin-bottom:1.1rem}
.card h3{font-size:1.2rem;margin-bottom:.5rem}
.card p{color:var(--muted);font-size:.94rem}
.card ul{list-style:none;margin-top:1rem;font-size:.86rem;color:var(--muted)}
.card ul li{padding-left:1.2rem;position:relative;margin:.3rem 0}
.card ul li::before{content:"›";position:absolute;left:0;color:var(--brand);font-weight:700}

/* --- Why band ----------------------------------------------------- */
.why{background:var(--surface);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.why-grid{display:grid;grid-template-columns:1fr 1fr;gap:3rem;align-items:center}
.why-list{display:grid;gap:1.4rem}
.why-item{display:flex;gap:1rem}
.why-item .n{font-family:var(--f-mono);color:var(--brand);font-weight:700;font-size:.9rem;padding-top:.2rem}
.why-item h4{font-family:var(--f-display);font-size:1.05rem;margin-bottom:.2rem}
.why-item p{color:var(--muted);font-size:.9rem}

/* --- Portfolio ---------------------------------------------------- */
.filters{display:flex;gap:.6rem;flex-wrap:wrap;margin-bottom:2rem}
.filters button{font-family:var(--f-mono);font-size:.78rem;letter-spacing:.05em;padding:.5rem 1rem;border-radius:999px;border:1px solid var(--border);background:transparent;color:var(--muted);cursor:pointer;transition:var(--t)}
.filters button.active,.filters button:hover{background:var(--brand-soft);color:var(--brand);border-color:var(--brand)}
.proj{border-radius:var(--r-lg);overflow:hidden;border:1px solid var(--border);background:var(--surface);transition:var(--t)}
.proj:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.proj .thumb{height:170px;background:linear-gradient(135deg,var(--surface-2),var(--brand-soft));display:grid;place-items:center;font-family:var(--f-mono);color:var(--brand);letter-spacing:.1em}
.proj .body{padding:1.3rem}
.proj .tag{font-family:var(--f-mono);font-size:.68rem;text-transform:uppercase;letter-spacing:.15em;color:var(--muted)}
.proj h3{font-size:1.1rem;margin:.3rem 0 .5rem}
.proj p{font-size:.88rem;color:var(--muted)}
.chips{display:flex;gap:.4rem;flex-wrap:wrap;margin-top:.9rem}
.chips span{font-family:var(--f-mono);font-size:.68rem;padding:.2rem .55rem;border-radius:6px;background:var(--surface-2);color:var(--muted)}

/* --- Stats -------------------------------------------------------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:1.2rem;text-align:center}
.stat{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);padding:2rem 1rem}
.stat b{font-family:var(--f-display);font-size:clamp(2.2rem,5vw,3.2rem);display:block;color:var(--brand)}
.stat small{font-family:var(--f-mono);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}

/* --- Testimonials ------------------------------------------------- */
.quotes{display:grid;grid-template-columns:repeat(3,1fr);gap:1.2rem}
.quote{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);padding:1.8rem}
.quote p{font-size:.98rem;margin-bottom:1.2rem}
.quote .who{display:flex;align-items:center;gap:.8rem}
.quote .av{width:40px;height:40px;border-radius:50%;background:var(--brand-soft);color:var(--brand);display:grid;place-items:center;font-weight:700;font-family:var(--f-display)}
.quote .who b{font-size:.9rem;display:block}
.quote .who small{color:var(--muted);font-size:.78rem}

/* --- CTA band ----------------------------------------------------- */
.cta-band{background:linear-gradient(120deg,var(--brand),var(--brand-deep));color:#fff;border-radius:var(--r-lg);padding:clamp(2.5rem,6vw,4rem);text-align:center}
.cta-band h2{font-size:clamp(1.8rem,4.5vw,2.8rem);color:#fff}
.cta-band p{max-width:480px;margin:1rem auto 2rem;color:rgba(255,255,255,.9);font-weight:500}
.cta-band .btn{background:#fff;color:var(--brand)}
.cta-band .btn:hover{transform:translateY(-2px)}

/* --- FAQ ---------------------------------------------------------- */
.faq-item{border-bottom:1px solid var(--border)}
.faq-q{width:100%;text-align:left;background:none;border:none;color:var(--text);font-family:var(--f-display);font-size:1.05rem;padding:1.3rem 0;cursor:pointer;display:flex;justify-content:space-between;gap:1rem;align-items:center}
.faq-q .pl{color:var(--brand);transition:var(--t);font-size:1.4rem}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease;color:var(--muted);font-size:.94rem}
.faq-item.open .faq-a{max-height:220px;padding-bottom:1.3rem}
.faq-item.open .pl{transform:rotate(45deg)}

/* --- Contact ------------------------------------------------------ */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:3rem}
.field{margin-bottom:1.1rem}
.field label{font-family:var(--f-mono);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);display:block;margin-bottom:.4rem}
.field input,.field textarea{width:100%;padding:.9rem 1rem;border-radius:12px;border:1px solid var(--border);background:var(--surface);color:var(--text);font-family:var(--f-body);font-size:.95rem;transition:var(--t)}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-soft)}
.field .err{color:var(--danger);font-size:.78rem;margin-top:.3rem;display:none}
.field.invalid .err{display:block}
.field.invalid input,.field.invalid textarea{border-color:var(--danger)}
.info-row{display:flex;gap:.9rem;margin-bottom:1.4rem;align-items:flex-start}
.info-row .ic{width:40px;height:40px;border-radius:12px;background:var(--brand-soft);color:var(--brand);display:grid;place-items:center;flex:none}
.info-row b{display:block;font-family:var(--f-display)}
.info-row span{color:var(--muted);font-size:.9rem}

/* --- Footer ------------------------------------------------------- */
footer{border-top:1px solid var(--border);padding:3.5rem 0 2rem;background:var(--surface)}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:2rem;margin-bottom:2.5rem}
.foot-grid p{color:var(--muted);font-size:.9rem;max-width:280px;margin-top:1rem}
.foot-col h5{font-family:var(--f-mono);font-size:.72rem;letter-spacing:.15em;text-transform:uppercase;color:var(--muted);margin-bottom:1rem}
.foot-col a{display:block;color:var(--text);font-size:.9rem;margin:.5rem 0;transition:var(--t)}
.foot-col a:hover{color:var(--brand)}
.foot-bottom{border-top:1px solid var(--border);padding-top:1.5rem;display:flex;justify-content:space-between;flex-wrap:wrap;gap:1rem;color:var(--muted);font-size:.82rem;font-family:var(--f-mono)}

/* --- Toast / progress / back-to-top ------------------------------ */
.toast{position:fixed;bottom:2rem;left:50%;transform:translateX(-50%) translateY(140%);background:var(--success);color:#0b1712;padding:.9rem 1.5rem;border-radius:12px;font-weight:600;z-index:99;transition:var(--t);box-shadow:var(--shadow)}
.toast.show{transform:translateX(-50%) translateY(0)}
#progress{position:fixed;top:0;left:0;height:3px;background:var(--brand);width:0;z-index:60}
#top{position:fixed;bottom:1.5rem;right:1.5rem;width:46px;height:46px;border-radius:50%;background:var(--brand);color:#fff;border:none;cursor:pointer;font-size:1.2rem;display:grid;place-items:center;opacity:0;pointer-events:none;transition:var(--t);z-index:55}
#top.show{opacity:1;pointer-events:auto}

/* --- Utilities (replace inline styles for CSP compliance) -------- */
.u-surface{background:var(--surface);border-top:1px solid var(--border)}
.u-surface-y{background:var(--surface);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.u-muted{color:var(--muted)}
.u-h2{font-size:clamp(1.9rem,4.5vw,3rem);margin:.8rem 0}
.u-h2-contact{font-size:clamp(1.9rem,4.5vw,3rem);margin:.8rem 0 1.5rem}
.u-mt{margin-top:1.6rem}
.u-narrow{max-width:760px}
.u-flush-top{padding-top:0}
.u-btn-sm{padding:.6rem 1.1rem}
.u-btn-full{width:100%;justify-content:center}

/* --- Accessibility: skip link ------------------------------------ */
.skip{position:absolute;left:-999px;top:0;background:var(--brand);color:#fff;padding:.7rem 1.2rem;border-radius:0 0 8px 0;z-index:100;font-weight:600}
.skip:focus{left:0}