:root {
  --bg: #1f1f1f;
  --surface: #2a2a2a;
  --text: #f5f5f5;
  --muted: #c5c5c5;
  --line: #3a3a3a;
  --accent-red: #f14f44;
  --accent-blue: #386bb7;
  --max: 900px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--text); background: radial-gradient(circle at 8% 0, rgba(241, 79, 68, 0.16), transparent 32%), radial-gradient(circle at 96% 10%, rgba(56, 107, 183, 0.17), transparent 35%), #1b1b1b; font-family: "Manrope", Arial, sans-serif; line-height: 1.75; }
a { color: inherit; }
.container { width: min(1160px, calc(100% - 2rem)); margin: 0 auto; }
.site-header { position: sticky; top: 0; z-index: 5; background: rgba(27, 27, 27, 0.88); border-bottom: 1px solid rgba(255, 255, 255, 0.09); backdrop-filter: blur(9px); }
.nav { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.brand img { display: block; width: auto; height: 48px; }
.nav-link { color: var(--muted); font-weight: 700; text-decoration: none; }
.nav-link:hover { color: var(--text); }
main { padding: 3rem 0 4rem; }
article { width: min(var(--max), 100%); margin: 0 auto; }
.eyebrow { margin: 0 0 .8rem; color: var(--accent-red); font-size: .78rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
h1, h2 { font-family: "Sora", Arial, sans-serif; line-height: 1.2; letter-spacing: 0; }
h1 { margin: 0; font-size: clamp(2rem, 5vw, 3.7rem); }
h2 { margin: 2.1rem 0 .65rem; font-size: clamp(1.25rem, 2.5vw, 1.65rem); }
.lead { margin: 1.2rem 0 1.8rem; max-width: 68ch; color: var(--muted); font-size: clamp(1.05rem, 1.8vw, 1.22rem); }
.hero-image { display: block; width: 100%; height: auto; margin: 1.6rem 0 2.1rem; border: 1px solid rgba(255, 255, 255, 0.13); border-radius: 10px; background: #151515; }
p { margin: .8rem 0; color: var(--muted); font-size: 1.04rem; }
.problem { margin-top: 2rem; padding: 1.35rem; border: 1px solid rgba(241, 79, 68, 0.3); border-radius: 8px; background: rgba(241, 79, 68, 0.08); }
.problem h2 { margin-top: 0; color: var(--text); }
.tags { display: flex; flex-wrap: wrap; gap: .5rem; margin: 1.4rem 0; }
.tag { padding: .3rem .65rem; color: var(--muted); border: 1px solid rgba(255, 255, 255, 0.16); border-radius: 999px; font-size: .8rem; font-weight: 700; }
.tech-note { margin-top: 2rem; padding: 1.35rem; border-left: 3px solid var(--accent-blue); background: rgba(56, 107, 183, 0.12); }
.tech-note h2 { margin-top: 0; }
.cta { margin-top: 2.2rem; padding: 1.6rem; border: 1px solid rgba(255, 255, 255, 0.15); border-radius: 8px; background: rgba(255, 255, 255, 0.04); }
.cta h2 { margin-top: 0; }
.btn { display: inline-flex; align-items: center; justify-content: center; margin-top: .4rem; padding: .78rem 1.1rem; border-radius: 999px; background: var(--accent-red); color: #fff; font-weight: 800; text-decoration: none; }
.btn:hover { background: #d94138; }
footer { padding: 1.5rem 0 2.5rem; color: var(--muted); border-top: 1px solid rgba(255,255,255,.1); font-size: .9rem; }
@media (max-width: 620px) { main { padding-top: 2rem; } .nav-link { font-size: .86rem; } .brand img { height: 40px; } p { font-size: 1rem; } .problem, .tech-note, .cta { padding: 1.1rem; } }