:root{
  --hero-bg:#0a0f1f; --accent:#2563eb; --accent-light:#60a5fa;
  --accent-grad-btn:linear-gradient(90deg,#1d4ed8,#2563eb);
  --accent-grad-text:linear-gradient(90deg,#3b82f6,#6366f1);
  --ink:#111827; --muted:#6b7280; --line:#e6ebf3; --bg:#ffffff; --bg-alt:#f7f9fc;
  --maxw:1120px; --radius:10px;
}
*{box-sizing:border-box;margin:0}
html{scroll-behavior:smooth}
body{font-family:Inter,system-ui,sans-serif;color:var(--ink);background:var(--bg);line-height:1.6}
h1,h2,h3,h4{font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-weight:800;line-height:1.15}
a{color:inherit}
.skip-link{position:absolute;left:-9999px}
.skip-link:focus{left:8px;top:8px;background:#fff;padding:8px 12px;z-index:100;border-radius:6px}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* layout */
.section{padding:72px 20px}
.section-inner{max-width:var(--maxw);margin:0 auto}
.section--alt{background:var(--bg-alt)}
.section--alt2{background:#eef2f9}
.label{display:inline-block;font-size:.75rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--accent)}
.gradient-text{background:var(--accent-grad-text);-webkit-background-clip:text;background-clip:text;color:transparent}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:6px;font-weight:600;border-radius:var(--radius);padding:12px 20px;text-decoration:none;border:1px solid transparent;cursor:pointer;font-size:.95rem}
.btn-sm{padding:8px 14px;font-size:.85rem}
.btn-primary{background:var(--accent-grad-btn);color:#fff}
.btn-secondary{background:transparent;border-color:#334155;color:#cbd5e1}
.btn-whatsapp{background:transparent;padding:0;border:none;display:inline-flex;align-items:center}
.nav-links .btn-primary{color:#fff}

/* nav */
.site-nav{display:flex;justify-content:space-between;align-items:center;max-width:var(--maxw);margin:0 auto;padding:16px 20px}
.nav-logo{text-decoration:none;display:flex;align-items:center}
.nav-logo img{height:55px;width:auto;display:block}
.nav-links{display:flex;gap:22px;align-items:center}
.nav-links a{text-decoration:none;color:var(--muted);font-weight:500}
.nav-links a[aria-current=page]{color:var(--ink)}
.nav-hamburger{display:none;background:none;border:0;flex-direction:column;gap:4px;cursor:pointer}
.nav-hamburger span{width:22px;height:2px;background:var(--ink);display:block}
.mobile-nav{display:none;flex-direction:column;gap:14px;padding:20px}
.mobile-nav.is-open{display:flex}
@media(max-width:760px){.nav-links{display:none}.nav-hamburger{display:flex}}

/* hero (dark) */
.hero--dark{background:var(--hero-bg);color:#fff;position:relative;overflow:hidden;padding:96px 20px}
.hero--dark::after{content:"";position:absolute;top:-80px;right:-80px;width:380px;height:380px;background:radial-gradient(circle,var(--accent),transparent 70%);opacity:.55;pointer-events:none}
.hero--dark .label{color:var(--accent-light)}
.hero--dark h1{font-size:clamp(2rem,5vw,3.4rem);margin:14px 0}
.hero--dark p{color:#9aa3b2;max-width:540px;margin-bottom:24px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;position:relative}

/* logo ticker */
.clients-row{display:grid;grid-template-columns:160px 1fr;align-items:center;gap:32px}
.clients-row .label{white-space:nowrap}
.logo-ticker{overflow:hidden;width:100%}
.logo-ticker__track{display:flex;gap:48px;align-items:center;width:max-content;animation:ticker 18s linear infinite}
.logo-ticker__track img{width:100px;height:50px;object-fit:contain;filter:grayscale(1) opacity(0.6);transition:filter .2s;flex-shrink:0}
.logo-ticker__track img:hover{filter:grayscale(0) opacity(1)}
.logo-ticker:hover .logo-ticker__track{animation-play-state:paused}
@keyframes ticker{0%{transform:translateX(0)}100%{transform:translateX(-50%)}}

/* cards grid */
.grid{display:grid;gap:20px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
@media(max-width:760px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}}
.service-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px}
.service-card--featured{border-top:3px solid var(--accent)}
.service-card h3{margin-bottom:8px}
.work-card img{width:100%;height:180px;object-fit:cover;border-radius:var(--radius)}
.work-card .result{color:var(--accent);font-weight:600;font-size:.9rem}
.testimonial-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px}
.testimonial-card blockquote{font-size:1.05rem;margin-bottom:14px}
.process-step{padding:18px;border-left:3px solid var(--accent)}

/* CTA band (dark) */
.cta-band{background:var(--hero-bg);color:#fff;text-align:center;padding:80px 20px;position:relative;overflow:hidden}
.cta-band::after{content:"";position:absolute;bottom:-120px;left:50%;transform:translateX(-50%);width:520px;height:320px;background:radial-gradient(circle,var(--accent),transparent 70%);opacity:.4;z-index:0}
.cta-band .section-inner{position:relative;z-index:1}
.cta-band .hero-actions{justify-content:center}

/* footer */
.site-footer{background:#0a0f1f;color:#9aa3b2;padding:56px 20px 0}
.footer-inner{max-width:var(--maxw);margin:0 auto;display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px}
@media(max-width:760px){.footer-inner{grid-template-columns:1fr 1fr}}
.footer-col h4{color:#fff;margin-bottom:12px;font-size:.95rem}
.footer-col a{display:block;color:#9aa3b2;text-decoration:none;margin-bottom:8px}
.footer-bottom{max-width:var(--maxw);margin:40px auto 0;padding:20px 0;border-top:1px solid rgba(255,255,255,.08);font-size:.85rem}

/* forms + flash (see Task 7) */
.flash{padding:14px 16px;border-radius:var(--radius);margin-bottom:20px}
.flash--success{background:#ecfdf5;color:#065f46}
.flash--error{background:#fef2f2;color:#991b1b}
.form-group{margin-bottom:18px}
.form-group label{display:block;font-weight:600;margin-bottom:6px}
.form-group input,.form-group textarea,.form-group select{width:100%;padding:12px;border:1px solid var(--line);border-radius:var(--radius);font:inherit}
.field-error{color:#991b1b;font-size:.85rem}
.form-honeypot{position:absolute;left:-9999px}
.btn-submit{background:var(--accent-grad-btn);color:#fff;border:0;padding:14px 22px;border-radius:var(--radius);font-weight:600;cursor:pointer}
.form-group select{appearance:none;-webkit-appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23999' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 14px center;padding-right:38px}

/* motion */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .5s,transform .5s}
.reveal.is-in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.reveal{opacity:1;transform:none;transition:none}}