:root {
  --container-bg-start: rgba(220, 233, 247, 0.85);
  --container-bg-end: rgba(245, 248, 252, 0.85);
  --text-color: #003366;
  --accent: #0077cc;

  --btn-width: 220px;
  --btn-radius: 25px;
  --btn-text: #ffffff;

  --patient-btn: #2d9cdb;
  --patient-btn-hover: #238ac3;

  --staff-btn: #27ae60;
  --staff-btn-hover: #219150;

  --admin-btn: #9b51e0;
  --admin-btn-hover: #894dd4;

  --toggle-bg: rgba(255,255,255,0.85);
  --toggle-color: #003366;

  --shadow: 0 6px 18px rgba(12, 30, 60, 0.08);
  --transition: 0.25s ease-in-out;
}


.dark {
  --container-bg-start: rgba(11, 18, 32, 0.85);
  --container-bg-end: rgba(7, 16, 34, 0.85);
  --text-color: #e6eef9;
  --accent: #3aa0ff;

  --patient-btn: #135f81;
  --patient-btn-hover: #0f4f69;

  --staff-btn: #1f7a3b;
  --staff-btn-hover: #18602f;

  --admin-btn: #6f3a9b;
  --admin-btn-hover: #5a3080;

  --toggle-bg: rgba(255,255,255,0.08);
  --toggle-color: #e6eef9;

  --shadow: 0 6px 18px rgba(0,0,0,0.5);
}


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

html, body {
  height: 100%;
}

body {
  font-family: "Poppins", Arial, sans-serif;
  background: url("../../uploads/backgroundindex.png") center/cover no-repeat fixed;
  color: var(--text-color);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  transition: color var(--transition);
}


.container {
  background: linear-gradient(135deg, var(--container-bg-start), var(--container-bg-end));
  box-shadow: var(--shadow);
  border-radius: 14px;
  padding: 40px;
  max-width: 600px;
  width: 90%;
  text-align: center;
  backdrop-filter: blur(6px);
  transition: background var(--transition), color var(--transition);
}


header h1 {
  font-size: 2rem;
  color: var(--text-color);
  letter-spacing: 1px;
  margin-bottom: 25px;
  text-shadow: 0 2px 6px rgba(0,0,0,0.1);
}


.theme-toggle {
  position: fixed;
  right: 24px;
  top: 24px;
  z-index: 1000;
}

#theme-toggle {
  background: var(--toggle-bg);
  color: var(--toggle-color);
  border: none;
  padding: 10px 14px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 1.05rem;
  box-shadow: var(--shadow);
  transition: transform var(--transition), background var(--transition), color var(--transition);
}

#theme-toggle:hover {
  transform: translateY(-3px);
}


main {
  display: flex;
  flex-direction: column;
  gap: 15px;
  align-items: center;
}

.btn {
  display: inline-block;
  padding: 12px 30px;
  color: var(--btn-text);
  text-decoration: none;
  font-size: 1rem;
  border-radius: var(--btn-radius);
  transition: transform var(--transition), background var(--transition);
  width: var(--btn-width);
  text-align: center;
  font-weight: 500;
}

/* Role-specific button colors */
main a:nth-child(1) { background-color: var(--patient-btn); }
main a:nth-child(1):hover { background-color: var(--patient-btn-hover); }

main a:nth-child(2) { background-color: var(--staff-btn); }
main a:nth-child(2):hover { background-color: var(--staff-btn-hover); }

main a:nth-child(3) { background-color: var(--admin-btn); }
main a:nth-child(3):hover { background-color: var(--admin-btn-hover); }

.btn:hover {
  transform: translateY(-4px);
}

/* ==============================
   RESPONSIVE
   ============================== */
@media (max-width: 600px) {
  header h1 { font-size: 1.5rem; }
  .btn { width: 80%; }
  .theme-toggle { right: 14px; top: 14px; }
  .container { padding: 25px; border-radius: 12px; }
}