/* =========================
   Reset & Base
========================= */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  background: radial-gradient(
      1200px 600px at 50% -200px,
      #e8f5f3 0%,
      transparent 60%
    ),
    linear-gradient(180deg, #f7faf9 0%, #eef2f1 100%);
  color: #0f172a;
  line-height: 1.5;
}

/* =========================
   Header / Navigation
========================= */
header {
  background: transparent;
}

header nav {
  padding: 1.25rem;
  display: flex;
  justify-content: center;
  gap: 2.25rem;
}

header nav a {
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  color: #0f766e;
  transition: color 0.2s ease, transform 0.2s ease;
}

header nav a:hover {
  color: #0d9488;
  transform: translateY(-1px);
}

/* =========================
   Layout
========================= */
.login-interface {
  min-height: calc(100vh - 80px);
  display: grid;
  place-items: center;
  padding: 2rem 1rem;
}

/* =========================
   Login Card
========================= */
.login-frame {
  width: 100%;
  max-width: 420px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  padding: 2.75rem 2.25rem;
  border-radius: 18px;
  box-shadow:
    0 30px 60px rgba(0, 0, 0, 0.08),
    0 0 0 1px rgba(15, 118, 110, 0.08);
}

/* =========================
   Headings
========================= */
.login-frame h1 {
  margin: 0 0 0.4rem;
  font-size: 1.75rem;
  font-weight: 700;
  text-align: center;
  color: #0f766e;
  letter-spacing: -0.02em;
}

.login-frame .subtitle {
  margin: 0 0 2.25rem;
  font-size: 0.95rem;
  text-align: center;
  color: #475569;
}

/* =========================
   Form
========================= */
form {
  display: grid;
  gap: 1.4rem;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

label {
  font-size: 0.8rem;
  font-weight: 500;
  color: #334155;
}

/* Inputs feel soft & friendly */
input {
  padding: 0.75rem 0.9rem;
  font-size: 0.95rem;
  border-radius: 12px;
  border: 1px solid #d1fae5;
  background: #ffffff;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input:focus {
  outline: none;
  border-color: #0d9488;
  box-shadow: 0 0 0 4px rgba(13, 148, 136, 0.18);
}

/* =========================
   Submit Button
========================= */
button[type="submit"] {
  margin-top: 0.75rem;
  padding: 0.8rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: #ffffff;
  background: linear-gradient(
    135deg,
    #0d9488 0%,
    #14b8a6 100%
  );
  border: none;
  border-radius: 999px;
  cursor: pointer;
  transition:
    transform 0.15s ease,
    box-shadow 0.15s ease,
    opacity 0.15s ease;
}

button[type="submit"]:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 25px rgba(13, 148, 136, 0.35);
}

button[type="submit"]:active {
  transform: translateY(0);
  opacity: 0.9;
}

/* =========================
   Signup Prompt
========================= */
.signup-prompt {
  margin-top: 1.75rem;
  font-size: 0.9rem;
  text-align: center;
  color: #475569;
}

.signup-prompt a {
  margin-left: 0.3rem;
  font-weight: 600;
  color: #0d9488;
  text-decoration: none;
}

.signup-prompt a:hover {
  text-decoration: underline;
}

/* =========================
   Responsive Tweaks
========================= */
@media (max-width: 480px) {
  .login-frame {
    padding: 2.25rem 1.75rem;
  }
}