*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Nunito', 'Helvetica Neue', sans-serif;
  background: #fff;
  color: #1a1a1a;
  min-height: 100vh;
}

/* ── HEADER ── */
header {
  border-bottom: 3px solid #1a1a1a;
  padding: 18px 28px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.logo {
  font-size: 1.4rem;
  font-weight: 900;
  letter-spacing: -0.5px;
  user-select: none;
  text-decoration: none;
  color: inherit;
}
.logo-box {
  background: #1a1a1a;
  color: #fff;
  padding: 3px 10px;
  border-radius: 6px;
}

/* ── FOOTER ── */
footer {
  text-align: center;
  padding: 20px;
  font-size: 0.8rem;
  color: #ccc;
  font-weight: 600;
}

/* ── BUTTON BASE ── */
.btn {
  padding: 14px 52px;
  background: #1a1a1a;
  color: #fff;
  border: 3px solid #1a1a1a;
  border-radius: 50px;
  font-size: 1.15rem;
  font-family: inherit;
  font-weight: 800;
  cursor: pointer;
  box-shadow: 4px 4px 0 #1a1a1a;
  transition: transform 0.1s ease, box-shadow 0.1s ease;
  user-select: none;
  text-decoration: none;
  display: inline-block;
}
.btn:hover:not(:disabled) {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 #1a1a1a;
}
.btn:active:not(:disabled) {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 #1a1a1a;
}
.btn:disabled {
  background: #bbb;
  border-color: #bbb;
  cursor: not-allowed;
  box-shadow: 4px 4px 0 #bbb;
  transform: none;
}