:root {
  --green-dark: #4A7729;
  --green-light: #8CC63F;
  --yellow: #F6E652;
  --orange: #F7941D;
  --black: #000000;

  --bg: var(--green-dark);
  --card-bg: #ffffff10;
  --text: #f1f5f9;
  --muted: #d1d5db;
  --accent: var(--yellow);
  --border: rgba(255, 255, 255, 0.15);
  --radius: 14px;
  --shadow: 0 18px 45px rgba(0, 0, 0, 0.4);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: linear-gradient(160deg, var(--green-dark), var(--green-light));
  color: var(--text);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* HEADER + NAV */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 28px;
  background: rgba(0, 0, 0, 0.25);
  backdrop-filter: blur(6px);
}

.logo {
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: 0.05em;
  color: var(--yellow);
}

.logo span {
  color: var(--orange);
}

.nav a {
  margin-left: 18px;
  text-decoration: none;
  color: var(--text);
  font-weight: 500;
  transition: 0.2s;
}

.nav a:hover {
  color: var(--yellow);
}

/* MAIN */
.main {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 24px;
}

.card {
  background: rgba(0, 0, 0, 0.25);
  border-radius: var(--radius);
  padding: 32px 28px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  max-width: 520px;
  width: 100%;
  text-align: center;
}

.card h1 {
  margin: 0 0 12px;
  font-size: 1.8rem;
  color: var(--yellow);
}

.card .note {
  margin-top: 12px;
  font-size: 0.95rem;
  color: var(--muted);
}

/* FOOTER */
.footer {
  text-align: center;
  padding: 16px;
  color: var(--muted);
  font-size: 0.85rem;
}

@media (max-width: 600px) {
  .nav a {
    margin-left: 12px;
  }

  .card {
    padding: 24px 20px;
  }

  .card h1 {
    font-size: 1.5rem;
  }
}