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

/* Body styling */
body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #f0f4f8;
  color: #333;
  line-height: 1.6;
  padding: 20px;
}

/* Header styling */
header {
  text-align: center;
  margin-bottom: 30px;
}

header h1 {
  color: #1a73e8;
  font-size: 2.5rem;
  margin-bottom: 10px;
}

header p {
  color: #555;
  font-size: 1.1rem;
}

/* Grid layout for sessions */
.sessions-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr); /* 3 columns */
  grid-template-rows: repeat(4, auto);   /* 4 rows */
  gap: 20px;                             /* spacing between cards */
  width: 100%;
}

@media (max-width: 768px) {
  .sessions-grid {
    grid-template-columns: 1fr; /* 1 column on mobile */
    grid-template-rows: auto;   /* as many rows as needed */
  }
}

/* Session card styling */
.session {
  border-radius: 12px;
  padding: 20px;
  transition: transform 0.2s, box-shadow 0.2s;
}

.session:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.15);
}

/* Session headings */
.session h2 {
  margin-bottom: 15px;
}

/* Project list styling */
ul {
  list-style: none;
  display: grid;
  grid-template-rows: repeat(4, auto); /* only 2 rows */
  grid-auto-flow: column;              /* fill down, then move right */
  gap: 10px;
  padding: 0;
}
ul li {
  margin: 0;
}

ul li a {
  text-decoration: none;
  color: inherit;
  font-weight: bold;
  padding: 6px 10px;
  display: inline-block;
  border-radius: 6px;
  transition: background 0.2s, color 0.2s;
}

ul li a:hover {
  background: rgba(255,255,255,0.3);
}

/* Session color schemes */
.session-1 { background: linear-gradient(135deg, #1a73e8, #4285f4); color: #fff; }
.session-2 { background: linear-gradient(135deg, #34a853, #81c784); color: #fff; }
.session-3 { background: linear-gradient(135deg, #fbbc05, #fdd663); color: #fff; }
.session-4 { background: linear-gradient(135deg, #ea4335, #f48b84); color: #fff; }
.session-5 { background: linear-gradient(135deg, #9c27b0, #ba68c8); color: #fff; }
.session-6 { background: linear-gradient(135deg, #00bcd4, #4dd0e1); color: #fff; }
.session-7 { background: linear-gradient(135deg, #ff9800, #ffb74d); color: #fff; }
.session-8 { background: linear-gradient(135deg, #8bc34a, #aed581); color: #fff; }
.session-9 { background: linear-gradient(135deg, #03a9f4, #29b6f6); color: #fff; }
.session-10 { background: linear-gradient(135deg, #e91e63, #f06292); color: #fff; }
.session-11 { background: linear-gradient(135deg, #795548, #a1887f); color: #fff; }
.session-12 { background: linear-gradient(135deg, #607d8b, #90a4ae); color: #fff; }