* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  color: #0f172a;
}

/* full-page gradient background */
.page {
  min-height: 100vh;
  padding: 24px 16px 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  background: linear-gradient(135deg,
    #ff9a9e 0%,
    #fad0c4 20%,
    #fbc2eb 40%,
    #a6c0fe 60%,
    #ffd3a5 80%,
    #fda085 100%);
}

/* layout containers */
.header,
.main,
.footer {
  width: 100%;
  max-width: 720px;
}

/* header */
.header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.logo-circle {
  width: 44px;
  height: 44px;
  border-radius: 999px;
  background: radial-gradient(circle at 30% 30%, #ffffff, #ff6a88);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #111827;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.25);
}

.app-title {
  margin: 0;
  font-size: 1.6rem;
}

.app-subtitle {
  margin: 4px 0 0;
  font-size: 0.9rem;
  opacity: 0.9;
}

/* cards */
.card {
  background: rgba(255, 255, 255, 0.95);
  border-radius: 16px;
  padding: 18px 16px 20px;
  box-shadow: 0 10px 25px rgba(15, 23, 42, 0.25);
  backdrop-filter: blur(6px);
}

.card-form {
  margin-bottom: 16px;
}

.card-results {
  margin-bottom: 16px;
}

/* text */
.note {
  margin: 0 0 10px;
  font-size: 0.92rem;
  color: #334155;
}

.note.small {
  font-size: 0.8rem;
  opacity: 0.9;
}

.field-label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  color: #0f172a;
}

/* form layout */
.form {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.field-row {
  display: flex;
  gap: 8px;
}

/* input */
.input {
  flex: 1;
  padding: 10px 12px;
  border-radius: 999px;
  border: 1px solid #cbd5f5;
  font-size: 0.95rem;
  outline: none;
  transition: box-shadow 0.15s ease, border-color 0.15s ease, background-color 0.15s ease;
  background-color: #f8fafc;
}

.input:focus {
  border-color: #6366f1;
  box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.35);
  background-color: #ffffff;
}

/* primary button */
.btn {
  border: none;
  cursor: pointer;
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  color: #ffffff;
  background-image: linear-gradient(135deg, #6366f1, #ec4899, #f97316);
  background-size: 200% 200%;
  box-shadow: 0 8px 18px rgba(148, 63, 255, 0.4);
  white-space: nowrap;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.12s ease, box-shadow 0.12s ease, background-position 0.25s ease;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 22px rgba(148, 63, 255, 0.5);
  background-position: 100% 0;
}

.btn:active {
  transform: translateY(1px);
  box-shadow: 0 4px 10px rgba(148, 63, 255, 0.35);
}

/* ghost button */
.btn.ghost {
  background: transparent;
  color: #0f172a;
  border: 1px solid rgba(15, 23, 42, 0.25);
  box-shadow: none;
}

.btn.ghost:hover {
  background: rgba(255, 255, 255, 0.7);
  transform: translateY(-1px);
}

/* alerts */
.alert {
  padding: 10px 12px;
  border-radius: 10px;
  margin-bottom: 12px;
  font-size: 0.9rem;
}

.alert.error {
  background: #fee2e2;
  color: #b91c1c;
  border: 1px solid #fecaca;
}

.alert.ok {
  background: #dcfce7;
  color: #166534;
  border: 1px solid #bbf7d0;
}

/* footer */
.footer {
  margin-top: auto;
  padding-top: 8px;
  text-align: center;
}

.footer-text {
  margin: 2px 0;
  color: #0f172a;
}

.footer-text.small {
  font-size: 0.8rem;
  opacity: 0.9;
}

/* responsive for small screens */
@media (max-width: 600px) {
  .page {
    padding: 16px 10px 24px;
  }

  .field-row {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }
}