:root {
  --bg1: #050505;
  --bg2: #0f0f0f;
  --accent: #ffcc00;
  --muted: #bfbfbf;
}

* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
  margin: 0;
  font-family: Inter, system-ui, Arial, Helvetica, sans-serif;
  background: linear-gradient(90deg, var(--bg1), #0b0b0b 50%, #070707 100%);
  color: #fff;
}

/* Header */
header {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  background: transparent;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo img {
  height: 38px;
  filter: drop-shadow(0 2px 10px rgba(0, 0, 0, .6));
  border-radius: 6px;
}

/* Nav */
nav {
  display: flex;
  gap: 18px;
  align-items: center;
}

nav a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

/* HERO */
.hero {
  height: calc(100vh - 72px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 24px;
}

.hero h1 {
  font-size: 56px;
  margin: 0 0 8px;
  color: var(--accent);
  letter-spacing: 1px;
}

.hero p {
  color: var(--muted);
  font-size: 18px;
  margin: 0 0 30px;
  max-width: 760px;
}

/* CHECK Button */
.check-wrap {
  position: relative;
}

.btn-check {
  background: linear-gradient(180deg, var(--accent), #e6b800);
  color: #091014;
  font-weight: 800;
  padding: 16px 46px;
  font-size: 18px;
  border-radius: 12px;
  border: none;
  cursor: pointer;
  box-shadow: 0 18px 40px rgba(0,0,0,.6), 0 6px 18px rgba(0,0,0,.4);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.btn-check .dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #000;
  opacity: .85;
}

.glow {
  position: absolute;
  inset: -16px;
  z-index: -1;
  border-radius: 16px;
  background: linear-gradient(180deg, rgba(255, 204, 0, 0.08), transparent);
  filter: blur(22px);
  opacity: 0.95;
}

.spinner {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 3px solid rgba(0,0,0,0.2);
  border-top-color: #000;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Screen reader hidden area */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  left: 0; top: 0;
  width: 100%; height: 100%;
  z-index: 9999;
  align-items: center;
  justify-content: center;
  background: linear-gradient(180deg, rgba(0,0,0,0.45), rgba(0,0,0,0.6));
}

.modal-card {
  background: linear-gradient(180deg, #0f0f0f, #131313);
  border-radius: 12px;
  padding: 20px 22px;
  text-align: center;
  max-width: 420px;
  width: 90%;
  box-shadow: 0 12px 30px rgba(0,0,0,.6);
  border: 1px solid rgba(255, 255, 255, 0.03);
}

.modal-card h3 {
  margin: 8px 0 6px;
  color: var(--accent);
  font-size: 18px;
}

.modal-card p {
  color: var(--muted);
  margin: 0 0 12px;
  font-size: 14px;
}

.ok-btn {
  background: transparent;
  color: var(--accent);
  border: 1px solid rgba(255, 204, 0, 0.12);
  padding: 8px 12px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 700;
}

/* Mobile */
@media(max-width: 720px) {
  .hero h1 { font-size: 34px; }
  .btn-check { padding: 12px 18px; font-size: 16px; }
}