/* 🌈 Smart Attendance App - Professional UI CSS */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', sans-serif;
}

body {
  display: flex;
  height: 100vh;
  overflow: hidden;
  background: #f4f6fa;
  color: #333;
  transition: background-color 0.3s, color 0.3s;
}

.app {
  display: flex;
  width: 100%;
  height: 100vh;
}

.sidebar {
  width: 240px;
  background: linear-gradient(135deg, #00c6ff, #0072ff);
  padding: 1.5rem 1rem;
  color: white;
  display: flex;
  flex-direction: column;
  border-top-right-radius: 20px;
  border-bottom-right-radius: 20px;
  transition: background 0.3s;
}

.login-page {
  background: url('login-bg.jpg') no-repeat center center / cover;
  position: fixed;
  inset: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 10;
  flex-direction: column;
}

.login-content {
  backdrop-filter: blur(8px);
  background: rgba(255, 255, 255, 0.85);
  padding: 4rem;
  border-radius: 30px;
  text-align: center;
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
  max-width: 550px;
  width: 100%;
}

.login-content h1 {
  font-size: 2rem;
  color: #333;
  margin-bottom: 1rem;
}

.login-content input,
.login-content button {
  margin-top: 0.75rem;
  font-size: 1rem;
}

.sidebar .brand {
  font-size: 1.6rem;
  font-weight: bold;
  margin-bottom: 2rem;
  text-align: center;
}

.sidebar nav {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.sidebar nav button {
  background: transparent;
  border: none;
  color: white;
  font-size: 1rem;
  padding: 0.8rem 1rem;
  text-align: left;
  border-radius: 12px;
  transition: background 0.3s, transform 0.2s;
  cursor: pointer;
  height: 40px;
  display: flex;
  align-items: center;
}

.sidebar nav button:hover,
.sidebar nav button:focus {
  background: rgba(255, 255, 255, 0.2);
  outline: none;
  transform: translateX(5px);
}

main {
  flex-grow: 1;
  padding: 2rem;
  background: #ffffff;
  overflow-y: auto;
  border-radius: 20px;
  margin: 1rem;
  display: flex;
  flex-direction: column;
  transition: background-color 0.3s, color 0.3s;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  font-weight: 600;
  font-size: 1rem;
}

.view {
  display: none;
}

.view.active {
  display: block;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.card {
  padding: 1.5rem;
  border-radius: 16px;
  color: #fff;
  font-weight: bold;
  font-size: 1rem;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s ease-in-out;
}

.card span {
  font-size: 2rem;
  display: block;
  margin-top: 0.5rem;
}

.card:hover {
  transform: translateY(-5px);
}

.card.blue { background: #007bff; }
.card.green { background: #28a745; }
.card.orange { background: #fd7e14; }
.card.red { background: #dc3545; }

button {
  padding: 0.6rem 1.2rem;
  border: none;
  border-radius: 8px;
  background: #007bff;
  color: #fff;
  cursor: pointer;
  font-size: 0.9rem;
  margin-top: 1rem;
  transition: background 0.3s;
}

button:hover,
button:focus {
  background: #0056b3;
  outline: none;
}

input, select {
  padding: 0.6rem;
  margin: 0.6rem 0;
  width: 100%;
  max-width: 300px;
  border: 1px solid #ccc;
  border-radius: 8px;
  font-size: 1rem;
}

#reader {
  width: 100%;
  max-width: 500px;
  height: 300px;
  margin-top: 1rem;
  border: 1px solid #ddd;
  border-radius: 8px;
}

ul#logList {
  list-style: none;
  padding: 0;
}

ul#logList li {
  padding: 0.8rem;
  border-bottom: 1px solid #ccc;
  font-size: 0.95rem;
}

#attendanceSheet {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
  font-size: 0.95rem;
}

#attendanceSheet th, #attendanceSheet td {
  padding: 0.75rem;
  border: 1px solid #ddd;
  text-align: center;
}

#attendanceSheet th {
  background: #f1f3f5;
}

.dark {
  background-color: #1e1e2f;
  color: #f1f1f1;
}

.dark main {
  background-color: #292940;
}

.dark .sidebar {
  background: linear-gradient(135deg, #444, #666);
  color: #fff;
}

.dark .sidebar nav button {
  color: #fff;
}

.dark .card {
  box-shadow: none;
}

/* Responsive Mobile */
@media (max-width: 768px) {
  .app {
    flex-direction: column;
    height: auto;
  }
  .sidebar {
    flex-direction: row;
    overflow-x: auto;
    width: 100%;
    border-radius: 0;
    padding: 0.5rem 0.75rem;
  }
  .sidebar nav {
    display: flex;
    gap: 0.5rem;
  }
  .sidebar nav button {
    white-space: nowrap;
    height: 40px;
    padding: 0 1rem;
  }
  main {
    margin: 0;
    border-radius: 0;
    padding: 1rem;
  }
}