:root {
  --bg-top: #f8fafc;      /* light top */
  --bg-bottom: #0f172a;   /* dark bottom */

  --card-bg: rgba(255, 255, 255, 0.85);
  --text-main: #0f172a;
  --text-muted: #334155;
  --accent: #2563eb;
}

* { box-sizing: border-box; }
html, body { height: 100%; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color: var(--text-main);
  background: linear-gradient(
    to bottom,
    var(--bg-top) 0%,
    var(--bg-bottom) 100%
  );
}

.page {
  min-height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px 20px;
}

.card {
  width: 100%;
  max-width: 1100px;
  background: var(--card-bg);
  border-radius: 16px;
  padding: 32px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.25);
}

/* GRID */
.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: center;
}

/* LEFT */
.left {
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo {
  width: 100%;
  max-width: 480px;
  height: auto;
}

/* RIGHT */
.right {
  max-width: 520px;
}

h1 {
  margin: 0 0 12px;
  font-size: clamp(24px, 2.5vw, 34px);
  font-weight: 700;
}

.lead {
  margin: 0 0 14px;
  font-size: 18px;
  line-height: 1.6;
}

.sub {
  margin: 0 0 22px;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-muted);
}

/* BUTTON */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 20px;
  border-radius: 10px;
  background: var(--accent);
  color: #ffffff;
  text-decoration: none;
  font-weight: 700;
  box-shadow: 0 8px 18px rgba(37, 99, 235, 0.25);
}

.btn:hover { filter: brightness(0.95); }
.btn:active { transform: translateY(1px); }

/* RESPONSIVE */
@media (max-width: 860px) {
  .grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .right {
    margin: 0 auto;
  }
}