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

body {
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #1a2a6c 0%, #2a4d9b 50%, #1a2a6c 100%);
  padding: 20px;
}

.card {
  background: #ffffff;
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
  width: 100%;
  max-width: 440px;
  padding: 40px 36px;
}

.logo {
  display: block;
  margin: 0 auto 18px;
  max-width: 200px;
  height: auto;
}

.card h1 {
  font-size: 1.5rem;
  color: #1a2a6c;
  text-align: center;
  margin-bottom: 6px;
}

.card p.subtitle {
  text-align: center;
  color: #6b7280;
  font-size: 0.92rem;
  margin-bottom: 28px;
}

.field {
  margin-bottom: 18px;
}

.field label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: #374151;
  margin-bottom: 6px;
}

.field input {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid #d1d5db;
  border-radius: 10px;
  font-size: 0.95rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.field input:focus {
  outline: none;
  border-color: #2a4d9b;
  box-shadow: 0 0 0 3px rgba(42, 77, 155, 0.15);
}

.btn {
  display: block;
  width: 100%;
  padding: 13px;
  border: none;
  border-radius: 10px;
  background: linear-gradient(135deg, #1a2a6c, #2a4d9b);
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  transition: transform 0.15s, box-shadow 0.15s;
  margin-top: 8px;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(26, 42, 108, 0.35);
}

.error {
  background: #fef2f2;
  color: #b91c1c;
  border: 1px solid #fecaca;
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 0.88rem;
  margin-bottom: 18px;
  display: none;
}

/* join page */
.choices {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 24px;
}

.choice {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 20px;
  border-radius: 12px;
  text-decoration: none;
  color: #fff;
  font-weight: 600;
  font-size: 1.05rem;
  transition: transform 0.15s, box-shadow 0.15s;
}

.choice:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.25);
}

.choice.zoom {
  background: linear-gradient(135deg, #2d8cff, #0b5cce);
}

.choice.youtube {
  background: linear-gradient(135deg, #ff4e45, #cc0000);
}

.choice .icon {
  font-size: 1.6rem;
}

.greeting {
  text-align: center;
  color: #374151;
  font-size: 1rem;
  margin-bottom: 4px;
}