:root {
	--bg: #0f172a;
	--surface: #1e293b;
	--accent: #0ea5e9;
	--accent-alt: #38bdf8;
	--text: #f1f5f9;
	--text-dim: #cbd5e1;
	--radius: 10px;
	--transition: 0.25s ease;
	--gradient: linear-gradient(135deg,#0ea5e9,#6366f1);
}

* { box-sizing: border-box; margin:0; padding:0; }
body { font-family: 'Inter', Arial, sans-serif; background: var(--bg); color: var(--text); line-height:1.5; }
a { color: var(--accent-alt); text-decoration: none; }
a:hover { text-decoration: underline; }

.top-nav { position: sticky; top:0; z-index:100; background: var(--surface); display:flex; align-items:center; justify-content:space-between; padding: 12px 24px; box-shadow:0 4px 12px rgba(0,0,0,0.3); }
.brand { font-weight:700; font-size:1.25rem; letter-spacing:0.5px; background: var(--gradient); -webkit-background-clip:text; color:transparent; }
.brand .logo { height:32px; width:auto; display:block; margin-right:8px; }
.brand { display:flex; align-items:center; gap:8px; }
.nav-links { list-style:none; display:flex; gap:14px; }
.nav-links a { padding:8px 14px; border-radius: var(--radius); font-size:0.9rem; font-weight:500; color: var(--text-dim); transition: var(--transition); }
.nav-links a:hover { background: rgba(255,255,255,0.08); color: var(--text); }
.nav-links a.active { background: var(--accent); color:#fff; }

.lang-toggle { display:flex; gap:6px; }
.lang-btn { background: var(--surface); color: var(--text-dim); border:1px solid #334155; padding:6px 12px; border-radius: var(--radius); cursor:pointer; font-size:0.75rem; font-weight:600; letter-spacing:0.5px; transition: var(--transition); }
.lang-btn.active { background: var(--accent); color:#fff; border-color: var(--accent); }
.lang-btn:hover:not(.active) { background:#334155; }
.theme-btn { background: var(--surface); color: var(--accent); border:1px solid #334155; padding:6px 12px; border-radius: var(--radius); cursor:pointer; font-size:0.85rem; font-weight:600; transition: var(--transition); display:flex; align-items:center; }
.theme-btn:hover { background:#334155; }
.theme-btn.active { background: var(--accent); color:#fff; border-color: var(--accent); }

.hero { padding: 120px 24px 80px; text-align:center; background: radial-gradient(circle at 30% 30%, #1e3a8a 0%, #0f172a 60%); }
.hero-inner { max-width: 900px; margin:0 auto; }
.hero-title { font-size: clamp(1.9rem,5vw,3.2rem); font-weight:700; margin-bottom: 18px; }
.hero-sub { font-size:1.05rem; color: var(--text-dim); margin-bottom:28px; }
.cta-btn { display:inline-block; background: var(--gradient); color:#fff; padding:14px 28px; border-radius: var(--radius); font-weight:600; letter-spacing:0.5px; box-shadow:0 8px 24px rgba(0,0,0,0.35); transition: var(--transition); }
.cta-btn:hover { transform: translateY(-3px); box-shadow:0 12px 32px rgba(0,0,0,0.5); }

main { max-width: 980px; margin:0 auto; padding:40px 24px 80px; }
.protocol { margin-bottom:50px; background: var(--surface); padding:24px 26px 26px; border-radius: var(--radius); box-shadow:0 6px 18px rgba(0,0,0,0.25); }
.protocol h2 { font-size:1.4rem; margin-bottom:12px; font-weight:600; }
.protocol p { font-size:0.95rem; color: var(--text-dim); }
.protocol a { color: var(--accent-alt); }

.contact { background: linear-gradient(125deg,#1e293b,#0f172a); border:1px solid #334155; }

.site-footer { text-align:center; padding:30px 24px; background:#0b1220; font-size:0.75rem; color: var(--text-dim); }

@media (max-width: 840px) {
	.nav-links { flex-wrap:wrap; gap:6px; }
	.hero { padding: 100px 20px 60px; }
	.protocol { padding:20px; }
	.nav-links a { font-size:0.8rem; }
}

/* Smooth anchor scroll */
html { scroll-behavior:smooth; }

/* Language visibility helper (JS toggles [hidden]) */
.lang[hidden] { display:none !important; }

/* Light mode overrides */
body.light-mode {
	--bg:#f5f7fa;
	--surface:#ffffff;
	--accent:#0ea5e9;
	--accent-alt:#0369a1;
	--text:#0f172a;
	--text-dim:#475569;
	--gradient: linear-gradient(135deg,#0ea5e9,#6366f1);
}
body.light-mode .top-nav { box-shadow:0 4px 14px rgba(0,0,0,0.08); }
body.light-mode .protocol { box-shadow:0 6px 18px rgba(0,0,0,0.08); }
body.light-mode .hero { background: radial-gradient(circle at 30% 30%, #e0f2fe 0%, #f5f7fa 70%); }
body.light-mode .site-footer { background:#e2e8f0; color:#475569; }