/* === Sereno Futuristic UI Refresh (clean build) === */
:root {
  --primary: #4ECDC4;
  --accent1: #B19CD9;
  --accent2: #FFB6A3;
  --ink: #0f172a;
  --ink-2: #334155;
  --bg: #0b1020;
  --card: rgba(255,255,255,0.08);
  --glass: rgba(255,255,255,0.14);
  --border: rgba(255,255,255,0.18);
  --shadow: 0 10px 30px rgba(0,0,0,0.35);
  --radius: 16px;
  --radius-lg: 22px;
  --grad: linear-gradient(135deg, #4ECDC4 0%, #B19CD9 50%, #FFB6A3 100%);
  --grad-soft: radial-gradient(1200px 600px at 10% -20%, #4ECDC4 0%, transparent 60%),
               radial-gradient(1000px 500px at 110% 20%, #B19CD9 0%, transparent 60%),
               radial-gradient(900px 600px at 50% 120%, #FFB6A3 0%, transparent 60%);
  --font: "Plus Jakarta Sans", system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0; color: #e5e7eb;
  background:
    radial-gradient(1200px 800px at -10% -20%, rgba(78,205,196,0.25), transparent 60%),
    radial-gradient(1200px 800px at 120% 10%, rgba(177,156,217,0.25), transparent 60%),
    radial-gradient(1400px 900px at 30% 130%, rgba(255,182,163,0.22), transparent 60%),
    var(--bg);
  font: 500 16px/1.65 var(--font);
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
}

a { color: #f8fafc; text-decoration: none; }
a:hover { opacity: .9; }

/* --- Top Navigation (glass) --- */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(10, 15, 30, 0.55);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1080px; margin: 0 auto;
  padding: 10px 20px;
  display: flex; align-items: center; justify-content: space-between;
}
.brand { display: flex; align-items: center; }
.brand-logo { height: 20px; width: auto; display:block; filter: drop-shadow(0 4px 8px rgba(0,0,0,0.35)); }
@media (min-width: 768px) { .brand-logo { height: 26px; } }

.menu a { margin: 0 8px; color: #cbd5e1; font-weight: 600; }
.menu a:hover { color: #ffffff; }
.menu .btn { margin-left: 10px; }

/* --- Buttons --- */
.btn {
  --btn-bg: var(--grad);
  display: inline-block;
  padding: 10px 16px;
  border-radius: 999px;
  color: #0b1220;
  font-weight: 700;
  background: var(--btn-bg);
  border: 1px solid rgba(255,255,255,0.25);
  box-shadow: 0 6px 18px rgba(78,205,196,0.25), 0 2px 6px rgba(0,0,0,0.3);
  transition: transform .08s ease, box-shadow .2s ease, opacity .2s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn.alt {
  background: transparent;
  color: #e5e7eb;
  border: 1px solid transparent;
  background:
    linear-gradient(rgba(255,255,255,0.08), rgba(255,255,255,0.08)) padding-box,
    linear-gradient(135deg, #4ECDC4, #B19CD9, #FFB6A3) border-box;
  box-shadow: 0 6px 18px rgba(0,0,0,0.25);
}

/* --- Layout --- */
.container { max-width: 1080px; margin: 0 auto; padding: 32px 20px; }
.hero {
  text-align: center;
  padding: 96px 20px 56px;
  background: var(--grad-soft);
}
.hero h1 {
  margin: 10px auto 12px;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.12; letter-spacing: -0.02em; color: #ffffff;
}
.hero p {
  margin: 0 auto; max-width: 720px;
  font-size: clamp(16px, 2.1vw, 18px); color: #cbd5e1;
}
.benefits { display:flex; flex-wrap:wrap; gap:10px; justify-content:center; margin-top: 18px; }
.benefits span {
  background: rgba(255,255,255,0.09);
  border: 1px solid var(--border);
  color:#e2e8f0; padding: 6px 10px; border-radius: 999px; font-size: 13px; backdrop-filter: blur(8px);
}

/* Grid & cards (glassmorphism) */
.grid { display: grid; gap: 18px; }
.grid.cols-3 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 18px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}
.card h3 { margin: 6px 0 8px; color: #fff; letter-spacing: -0.01em; }
.card p { color: #cbd5e1; }

/* Forms */
label { color: #e2e8f0; font-size: 13px; font-weight: 600; }
.input, select, textarea {
  width: 100%; padding: 12px 12px; margin-top: 6px;
  border-radius: 12px; border: 1px solid var(--border);
  background: var(--glass); color: #f8fafc;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.06);
  outline: none;
}
.input::placeholder { color: #94a3b8; }
.form-row { display: flex; gap: 12px; }
.form-row > * { flex: 1; }

/* Footer */
footer {
  margin-top: 40px; padding: 22px 20px;
  background: rgba(10, 15, 30, 0.75);
  border-top: 1px solid var(--border);
  backdrop-filter: blur(10px);
}
.footer-inner {
  max-width: 1080px; margin: 0 auto;
  display:flex; flex-wrap:wrap; gap:10px; justify-content:space-between; align-items:center;
}
.small { font-size: 13px; color: #94a3b8; }

/* Utilities */
h1,h2,h3 { letter-spacing: -0.02em; }
h2 { color: #fff; font-size: clamp(22px, 3vw, 30px); }
section.container .card h2 { margin-top: 0; }

/* QR overlay */
.qr-overlay {
  display: none; position: fixed; inset: 0;
  background: rgba(0,0,0,.6); z-index: 1200;
  align-items: center; justify-content: center; padding: 16px;
}
.qr-box {
  max-width: 380px; width: 92%;
  background: rgba(16,20,35,0.9);
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: 18px; box-shadow: 0 12px 30px rgba(0,0,0,.45);
  padding: 18px; text-align: center; color: #e5e7eb;
}
.qr-box img { width: 240px; height: auto; display:block; margin: 10px auto 16px; border-radius: 12px; }
.qr-actions { display:flex; gap:10px; justify-content:center; flex-wrap:wrap; }
.qr-actions .btn { padding: 10px 14px; }