* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 20px;
  font-family: "Tahoma", sans-serif;
  background: linear-gradient(135deg, #102a43, #176b68);
}

.login-card {
  width: 100%;
  max-width: 430px;
  padding: 36px;
  background: white;
  border-radius: 20px;
  box-shadow: 0 18px 55px #0003;
}

.logo {
  font-size: 38px;
  color: #16846b;
  text-align: center;
}

h1 {
  font-size: 24px;
  color: #16324f;
  text-align: center;
  margin-bottom: 8px;
}

.subtitle {
  color: #64748b;
  text-align: center;
  margin-bottom: 30px;
}

label {
  display: block;
  margin: 16px 0 7px;
  font-weight: bold;
  color: #334155;
}

input {
  width: 100%;
  padding: 13px;
  border: 1px solid #cbd5e1;
  border-radius: 9px;
  font-size: 16px;
}

button {
  width: 100%;
  margin-top: 24px;
  padding: 14px;
  border: 0;
  border-radius: 9px;
  background: #16846b;
  color: white;
  font-size: 17px;
  font-weight: bold;
  cursor: pointer;
}

button:disabled { opacity: .65; cursor: wait; }

#message {
  text-align: center;
  color: #b91c1c;
  min-height: 24px;
}

footer {
  text-align: center;
  color: #94a3b8;
  font-size: 12px;
  margin-top: 20px;
}

#dashboard h2 {
  color: #16324f;
  margin-top: 28px;
}

#dashboard .stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 20px 0;
}

.stats > div {
  padding: 16px;
  background: #eef7f4;
  border-radius: 12px;
}

.stats small {
  display: block;
  color: #64748b;
  margin-bottom: 8px;
}

.stats strong {
  font-size: 22px;
  color: #176b68;
}

#progressBar {
  width: 100%;
  height: 20px;
  accent-color: #16846b;
}

.history-item {
  padding: 12px;
  border-bottom: 1px solid #e2e8f0;
}

[hidden] {
  display: none !important;
}

#attendancePanel {
  margin: 24px 0;
  padding: 18px;
  background: #f1f5f9;
  border-radius: 12px;
}

#sessionSelect {
  width: 100%;
  padding: 12px;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  font-size: 15px;
}

.attendance-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

#checkinButton { background: #16846b; }
#checkoutButton { background: #dc2626; }

#attendanceMessage {
  min-height: 22px;
  margin-top: 14px;
}

/* LAB 7.48: automatic daily session */
#sessionSelect {
    display: none;
}

/* LAB 7.50: hide obsolete session label */
label[for="sessionSelect"] {
    display: none;
}