/* ========= THEME ========= */
:root {
  --bg:#0b0f14;
  --card:#111826;
  --ink:#eef3fb;
  --muted:#9fb0c5;
  --line:#1e2a3c;
  --accent:#4dd1a7;

  --anim-fast:160ms;
  --anim-med:220ms;
  --easing:cubic-bezier(.2,.65,.2,1);
}

*{box-sizing:border-box;margin:0;padding:0}
img{max-width:100%;display:block}

/* ========= BASE ========= */
body {
  background:var(--bg);
  color:var(--ink);
  font:16px/1.55 Inter, system-ui, Segoe UI, Roboto, Ubuntu, sans-serif;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  margin:0;
}

a {color:var(--accent);text-decoration:none}
a:hover {text-decoration:underline}
a.btn {text-decoration:none;display:inline-block;color:inherit}

/* Layout */
.wrap {max-width:860px;margin:28px auto;padding:0 14px}
.stack {display:grid;gap:12px}
.row {display:flex;gap:10px;align-items:center;flex-wrap:wrap}

/* ========= CARDS ========= */
.card {
  background:var(--card);
  border:1px solid var(--line);
  border-radius:14px;
  padding:16px;
  box-shadow:0 6px 18px rgba(0,0,0,.28);
  transition:transform var(--anim-med) var(--easing),
             opacity var(--anim-med) var(--easing);
}
.reveal {opacity:0;transform:translateY(8px)}
.reveal.show {opacity:1;transform:translateY(0)}

/* ========= TEXT ========= */
h1 {font-size:28px;line-height:1.2;margin:0 0 8px}
h2 {font-size:22px;margin:0 0 6px}
h3 {font-size:18px;margin:0 0 6px}
p.lead {color:var(--muted);margin:0 0 16px}
.muted {color:var(--muted)}

/* ========= BUTTONS ========= */
.btn {
  cursor:pointer;
  border:1px solid var(--line);
  background:#0f1621;
  color:var(--ink);
  padding:10px 14px;
  border-radius:10px;
  position:relative;
  overflow:hidden;
  transition:transform var(--anim-fast) var(--easing),
             box-shadow var(--anim-fast) var(--easing),
             border-color var(--anim-fast) var(--easing),
             background var(--anim-fast) var(--easing);
}
.btn.primary {
  background:var(--accent);
  color:#00120e;
  border-color:transparent;
  font-weight:600;
}
.btn:hover {transform:translateY(-1px);box-shadow:0 6px 16px rgba(0,0,0,.25)}
.btn:active {transform:translateY(0);box-shadow:none}
.btn::after {
  content:"";
  position:absolute;inset:0;
  background:radial-gradient(circle at var(--x,50%) var(--y,50%),rgba(255,255,255,.18),transparent 45%);
  opacity:0;transform:scale(.9);
  transition:opacity 300ms var(--easing),transform 300ms var(--easing);
  pointer-events:none;
}
.btn.rippling::after {opacity:1;transform:scale(1)}

/* ========= INPUTS ========= */
input, select {
  width:100%;
  min-height:44px;
  display:block;
  padding:10px 12px;
  border-radius:10px;
  border:1px solid var(--line);
  background:#0f1621;
  color:var(--ink);
  font:inherit;
  transition:border var(--anim-fast) var(--easing),
             box-shadow var(--anim-fast) var(--easing),
             background var(--anim-fast) var(--easing);
}
input::placeholder {color:var(--muted)}
input:focus, select:focus {
  outline:none;
  border-color:var(--accent);
  box-shadow:0 0 0 2px rgba(77,209,167,.28);
}

/* Custom dropdown arrow */
select {
  appearance:none;
  -webkit-appearance:none;
  -moz-appearance:none;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='white'%3E%3Cpath d='M7 10l5 5 5-5'/%3E%3C/svg%3E");
  background-repeat:no-repeat;
  background-position:right 10px center;
  background-size:16px;
  padding-right:36px;
}

/* ========= CODE / BADGE ========= */
code.badge {
  display:inline-block;
  padding:10px 12px;
  border:1px solid var(--line);
  background:#0a111b;
  border-radius:10px;
  font-family:ui-monospace,Menlo,Consolas,monospace;
  word-break:break-all;
}

/* ========= QR ========= */
.qr {
  width:220px;
  height:220px;
  border-radius:12px;
  border:1px solid var(--line);
  background:linear-gradient(100deg,rgba(255,255,255,.08) 20%,rgba(255,255,255,.18) 30%,rgba(255,255,255,.08) 40%) #0a111b;
  background-size:200% 100%;
  animation:shimmer 1200ms var(--easing) infinite;
}
.qr.ready {animation:none;background:#0a111b}
@keyframes shimmer {
  0% {background-position:180% 0}
  100% {background-position:-20% 0}
}

/* ========= GRID ========= */
.two {display:grid;gap:14px}
@media(min-width:720px){.two{grid-template-columns:220px 1fr}}

/* ========= FOOTER ========= */
footer {margin:20px 0;color:var(--muted);text-align:center}

/* ========= MOBILE ========= */
@media(max-width:480px){
  body{font-size:15px}
  .qr{width:180px;height:180px}
  .btn{padding:8px 10px;font-size:14px}
  code.badge{font-size:14px;word-break:break-word}
}