/* ==============================
   Global variables & reset
   ============================== */
:root{
  /* Backgrounds */
  --bg: #eef7fb;              /* soft cyan page background */
  --card: #ffffff;            /* content cards */
  --border: #d1d5db;           /* light gray borders */

  /* Text */
  --text: #1f2933;             /* primary text */
  --muted: #4b5563;            /* secondary text */

  /* Navigation */
  --nav: #2f8fb3;              /* dark teal */
  --navText: #ffffff;
  --navHover: #4fb3d8;         /* lighter teal */

  /* Accent */
  --accent: #4fb3d8;

  /* Layout */
  --radius: 14px;
  --shadow: 0 10px 25px rgba(0,0,0,.08);
  --maxw: 980px;
}

*{
  box-sizing: border-box;
}

html, body{
  height: 100%;
}

body{
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial,
               "Apple Color Emoji","Segoe UI Emoji";
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ==============================
   Layout container
   ============================== */
.container{
  width: min(100% - 2rem, var(--maxw));
  margin: 0 auto;
  padding: 1.5rem 0 2.5rem;
}

/* ==============================
   Navigation bar
   ============================== */
.topnav{
  background: var(--nav);
  border-bottom: 1px solid rgba(255,255,255,.2);
  position: sticky;
  top: 0;
  z-index: 100;
}

.topnav .inner{
  width: min(100% - 2rem, var(--maxw));
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: .25rem;
  align-items: center;
  padding: .65rem 0;
}

.topnav a{
  color: var(--navText);
  text-decoration: none;
  padding: .55rem .75rem;
  border-radius: 10px;
  font-size: 0.98rem;
  line-height: 1.1;
  transition: background .2s ease;
}

.topnav a:hover{
  background: var(--navHover);
}

.topnav a.active{
  background: rgba(79,179,216,.35);
  border: 1px solid rgba(255,255,255,.45);
}

/* ==============================
   Content card
   ============================== */
.card{
  background: linear-gradient(
    180deg,
    #ffffff 0%,
    #f4fbfe 100%
  );
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: clamp(1rem, 2vw, 1.5rem);
  margin-top: 1.25rem;
}

/* ==============================
   Images
   ============================== */
.headshot{
  display: block;
  width: clamp(120px, 22vw, 190px);
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 999px;
  border: 2px solid var(--accent);
  box-shadow: 0 8px 20px rgba(0,0,0,.10);
  margin: 0 auto 1rem;
}

/* ==============================
   Typography
   ============================== */
h1{
  color: var(--nav);
}

h2, h3{
  background: var(--accent);
  color: #ffffff;
  padding: .35rem .75rem;
  border-radius: 6px;
  line-height: 1.3;
  margin: 0 0 .85rem;
}

p{
  margin: 0 0 1rem;
  text-align: justify;
  text-justify: inter-word;
  hyphens: auto;
}

a{
  color: var(--nav);
}

a:hover{
  text-decoration: underline;
}

/* ==============================
   Footer
   ============================== */
footer{
  margin-top: 1.25rem;
  text-align: center;
  color: var(--muted);
  font-size: .92rem;
  padding-top: 1rem;
}

/* ==============================
   Small screen adjustments
   ============================== */
@media (max-width: 420px){
  .container{
    width: min(100% - 1.25rem, var(--maxw));
  }

  .topnav a{
    padding: .5rem .6rem;
    font-size: .95rem;
  }

  h2, h3{
    font-size: 1.05rem;
  }
}


.algorithm-box {
  max-width: 800px;
  margin: 40px auto;              /* centers the box */
  padding: 24px 32px;
  border: 1px solid #d0d0d0;      /* light grey border */
  border-radius: 6px;
  background-color: #fafafa;     /* very light neutral background */
  font-family: "Helvetica Neue", Arial, sans-serif;
}

.algorithm-box pre {
  background-color: #f4f4f4;
  padding: 12px 16px;
  border-radius: 4px;
  font-size: 0.6rem;
  overflow-x: auto;
}

.grey {
  color: #6f6f6f;
  text-align: center;
}