/* === Global === */
html {
  color-scheme: light;
}

body {
  font-family: 'Segoe UI', sans-serif;
  margin: 0;
  padding: 0;
  background: linear-gradient(120deg, #f0f9ff, #cfe0fc);
  color: #333;
}

/* === Navbar === */
nav {
  background: #026aa7;
  color: white;
  padding: 1rem 2rem;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-links a {
  color: white;
  text-decoration: none;
  margin-left: 1.5rem;
  font-weight: bold;
}

.nav-links a:hover {
  text-decoration: underline;
}

/* === Main Layout === */
main {
  padding: 2rem;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  min-height: 80vh;
}

/* === Footer === */
footer {
  background: #f4f4f4;
  padding: 1rem;
  text-align: center;
  font-size: 0.9rem;
  color: #666;
}

/* === Flash Messages === */
.flash {
  background: #ffebeb;
  border: 1px solid #ff5a5a;
  padding: 1rem;
  color: #a94442;
  border-radius: 8px;
  margin-bottom: 1rem;
  width: 100%;
  text-align: center;
}

/* === Card === */
.card, .form-card {
  background: white;
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 8px 20px rgba(0,0,0,0.1);
  max-width: 500px;
  width: 100%;
  text-align: center;
  animation: fadeIn 0.5s ease-in-out;
}

/* === Form Elements === */
.sample-picker {
  margin: 1rem 0 1.25rem;
  padding: 1rem;
  background: #f7fbff;
  border: 1px solid #d6e8f7;
  border-radius: 8px;
  text-align: left;
}

.sample-picker label,
.form-card form label {
  display: block;
  margin-top: 0.35rem;
  color: #21485c;
  font-weight: 700;
  text-align: left;
}

input, select {
  width: 100%;
  padding: 0.75rem;
  margin: 0.6rem 0;
  border: 1px solid #ccc;
  border-radius: 8px;
  background-color: #ffffff;
  color: #243746;
  font-size: 1rem;
  box-sizing: border-box;
  transition: 0.3s border-color;
}

select {
  appearance: auto;
}

option {
  background-color: #ffffff;
  color: #243746;
}

input::placeholder {
  color: #6b7c89;
  opacity: 1;
}

input:focus, select:focus {
  border-color: #007acc;
  outline: none;
}

/* === Buttons === */
button, .btn, .btn-outline {
  padding: 0.75rem 1.5rem;
  margin: 0.5rem auto;
  border-radius: 8px;
  border: none;
  font-weight: bold;
  cursor: pointer;
  transition: 0.3s;
}

button {
  background: #007acc;
  color: white;
}

button:hover {
  background: #005fa3;
}

.btn {
  background: #026aa7;
  color: white;
  text-decoration: none;
}

.btn:hover {
  background: #004f86;
}

.btn-outline {
  background: transparent;
  color: #026aa7;
  border: 2px solid #026aa7;
  text-decoration: none;
}

.btn-outline:hover {
  background: #026aa7;
  color: white;
}

/* === Prediction Results === */
.results {
  margin-top: 1.5rem;
  padding: 1rem;
  background: #e6f9f0;
  border-left: 5px solid #1abc9c;
  border-radius: 8px;
  text-align: left;
}

/* === Animation === */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}