:root{
  --accent:#d32f2f;
  --accent-dark:#a31f1f;
  --bg-light:#eef2f6;
  --bg-dark:#070707;
  --text-light:#0f1724;
  --text-dark:#e6eef6;

  --card-bg: linear-gradient(180deg,#ffffff,#fbfbfd);
  --card-border: rgba(15,23,36,0.04);
  --card-muted:#6b7280;
  --glass: rgba(255,255,255,0.06);
  --container:1200px;
  --shadow: 0 12px 36px rgba(16,24,40,0.08);
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;font-family:Inter,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial;background:var(--bg-light);color:var(--text-light);-webkit-font-smoothing:antialiased;transition:background .25s,color .25s}
body.dark{
  background:var(--bg-dark);
  color:var(--text-dark);
  --card-bg: linear-gradient(180deg,#0d0d0d,#111);
  --card-border: rgba(255,255,255,0.06);
  --card-muted:#9aa0a6;
  --glass: rgba(255,255,255,0.03);
}
.container{max-width:var(--container);margin:0 auto;padding:28px}
.site-header{position:sticky;top:0;z-index:60}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:12px 18px;background:linear-gradient(90deg,rgba(211,47,47,0.06),transparent);backdrop-filter:blur(6px);border-bottom:1px solid rgba(0,0,0,0.06)}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:inherit}
.brand-logo{width:48px;height:48px;object-fit:contain}
.brand-name{font-weight:800;font-size:20px;color:var(--accent-dark)}
.main-nav{display:flex;align-items:center;gap:18px}
.nav-list{display:flex;gap:16px;list-style:none;padding:0;margin:0}
.nav-list a{color:inherit;text-decoration:none;padding:8px 10px;border-radius:8px;font-weight:700;position:relative;overflow:hidden}
.nav-list a::after{content:'';position:absolute;left:10px;right:10px;bottom:6px;height:2px;background:transparent;transition:all .22s}
.nav-list a:hover::after{background:var(--accent);height:3px;left:6px;right:6px}
.theme-toggle{background:transparent;border:1px solid rgba(0,0,0,0.06);padding:8px 10px;border-radius:10px;cursor:pointer}
.hero{padding:48px 0;position:relative;overflow:hidden}
.hero-inner{display:grid;grid-template-columns:1fr 520px;gap:32px;align-items:center;max-width:1200px;margin:0 auto;position:relative}
.hero-text h1{font-size:34px;margin:0 0 12px;color:var(--accent-dark);line-height:1.02}
.hero-sub{margin:0 0 18px;color:var(--card-muted)}
.hero-media{display:flex;justify-content:flex-end;align-items:center}
.hero-card{width:520px;border-radius:14px;overflow:hidden;background:var(--card-bg);padding:0;box-shadow:var(--shadow);border:1px solid var(--card-border);transition:transform .36s,box-shadow .36s}
.hero-image{width:100%;aspect-ratio:16/9;object-fit:cover;object-position:center;display:block}
.hero-meta{padding:12px 16px;font-size:13px;color:var(--card-muted)}
.hero-cta{position:absolute;right:40px;top:36px;z-index:70}
.btn{display:inline-block;padding:12px 18px;border-radius:12px;text-decoration:none;border:1px solid transparent;font-weight:800;transition:transform .18s,box-shadow .18s}
.btn.primary{background:linear-gradient(90deg,var(--accent),var(--accent-dark));color:#fff;box-shadow:0 8px 30px rgba(211,47,47,0.16)}
.btn.primary:active{transform:scale(.98)}
.btn:focus{outline:3px solid rgba(211,47,47,0.12);outline-offset:2px}
.section{padding:48px 0}
.features-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.feature{background:var(--card-bg);padding:18px;border-radius:12px;border:1px solid var(--card-border);box-shadow:var(--shadow);transition:transform .26s,box-shadow .26s}
.feature:hover{transform:translateY(-10px);box-shadow:0 30px 80px rgba(16,24,40,0.14)}
.download-grid{display:grid;grid-template-columns:2fr 1fr;gap:18px}
.download-card{background:var(--card-bg);padding:18px;border-radius:12px;border:1px solid var(--card-border);box-shadow:var(--shadow);transition:transform .26s}
.download-card:hover{transform:translateY(-8px)}
.projects-list{display:flex;gap:16px;flex-wrap:wrap}
.project-card{background:var(--card-bg);padding:16px;border-radius:12px;flex:1;min-width:260px;border:1px solid var(--card-border);box-shadow:var(--shadow);transition:transform .22s}
.project-card:hover{transform:translateY(-6px)}
.section .card{background:var(--glass);padding:16px;border-radius:12px;border:1px solid rgba(255,255,255,0.04)}
.site-footer{border-top:1px solid rgba(15,23,36,0.04);padding:20px 0;background:transparent}
.footer-inner{display:flex;justify-content:space-between;align-items:center}
.small{font-size:13px;color:#9aa0a6}

/* animations */
@keyframes float {0%{transform:translateY(0)}50%{transform:translateY(-8px)}100%{transform:translateY(0)}}
.float{animation:float 6s ease-in-out infinite}
.btn.primary:hover{transform:translateY(-4px);box-shadow:0 18px 50px rgba(211,47,47,0.18)}

/* reveal via class */
.card-anim{opacity:0;transform:translateY(20px);transition:opacity .6s ease, transform .6s ease}
.card-anim.in-view{opacity:1;transform:translateY(0)}

/* button click micro-animation */
@keyframes pulse {0%{transform:scale(1)}50%{transform:scale(0.96)}100%{transform:scale(1)}}
.btn.animate-click{animation:pulse .28s ease}

/* responsive */
@media(max-width:980px){.hero-inner{grid-template-columns:1fr}.features-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.features-grid{grid-template-columns:1fr}.header-inner{padding:8px}.hero-cta{right:20px;top:20px}}

.btn-get-started {
  display: inline-block;
  padding: 12px 28px;
  background: var(--accent-color);
  color: #fff;
  font-weight: bold;
  border-radius: 8px;
  transition: transform 0.3s, box-shadow 0.3s;
}
.btn-get-started:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.3);
}