/* CH7 add: universal box sizing */
* { box-sizing: border-box; }

/* --- existing (kept) --- */
body {
  background-color: #40407A; 
  max-width: 1600px; 
  min-width: 900px; 
  margin: 0; 
  font-family: Verdana, Arial, sans-serif; 
}

#wrapper {
  width: 80%;
  margin-left: auto;
  margin-right: auto;
  background-color: #F5F5F5; 
  padding: 2em;
}

header {
  background-color: #40407A; 
  color: #FFFFFF; 
  background-image: url(sunrise.jpg);
  background-size: 100% 100%; 
  /* CH7 add: leave space for fixed nav */
  margin-top: 50px;
}

/* CH7: header link styles */
header a { text-decoration: none; }
header a:link,
header a:visited { color: #FFFFFF; }
header a:hover { color: #EDF5F5; }

header.home {
  /* CH7 change: 40vh -> 50vh */
  height: 50vh; 
  min-height: 300px;
  padding-top: 6em;
  padding-left: 8em;
  font-size: 120%;
}

header.content {
  /* CH7 change: 200px -> 250px */
  height: 250px;
  padding-top: 2em;
  padding-left: 8em;
  padding-bottom: 2em;
}

/* CH7: make nav fixed top bar */
nav {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 9999;
  width: 100%;
  height: 50px;

  text-align: right; 
  background-color: #FFFFFF;
  margin: 0; 
  padding-top: 0.5em; 
  padding-bottom: 1em; 
  padding-right: 1em;  
  font-weight: bold; 
}

/* CH7: list-based nav styling */
nav ul {
  list-style-type: none;
  margin: 0;               /* requirement: zero margin */
  padding-right: 2em;      /* requirement: 2em right padding */
  font-size: 1.2em;        /* requirement */
}
nav li {
  display: inline;         /* requirement */
  padding-left: 2em;       /* requirement */
}

/* CH7: nav link states (colors) */
nav a:link    { color: #3F2860; }
nav a:visited { color: #497777; }
nav a:hover   { color: #A26100; }

/* keep your base nav anchor (no underline) */
nav a {
  text-decoration: none; 
  margin-left: 1em;
}

#mathero {
  height: 300px;
  background-image: url(yogamat.jpg);
  background-repeat: no-repeat;
  background-size: 100% 100%;
  /* CH7 add: ensure it drops below floated columns */
  clear: both;
}

#loungehero {
  height: 300px;
  background-image: url(yogalounge.jpg);
  background-repeat: no-repeat;
  background-size: 100% 100%;
  /* CH7 add: ensure it drops below floated columns */
  clear: both;
}

h2 { margin: 0; } 

footer {
  color: #40407A;
  text-align: center;
  font-style: italic;
  font-size: 0.9em;
  padding-top: 1em;
  /* CH7 add: clear right float */
  clear: right;
}

li, dd {
  font-size: 90%; 
}

/* CH7: column helpers */
.onethird {
  float: left;
  width: 33%;
  padding-left: 2em;
  padding-right: 2em;
}
.onehalf {
  float: left;
  width: 50%;
  padding-left: 2em;
  padding-right: 2em;
}