/* =====================================================================
   Internet of Habits (IoH) - stylesheet
   Brand palette inspired by KTU "ivaizdis" (KTU green + white + ink).
   --------------------------------------------------------------------- */

:root {
  --ktu-green:        #005c46;   /* primary */
  --ktu-green-dark:   #003d2e;
  --ktu-green-light:  #1aa37a;
  --ktu-mint:         #d8efe6;
  --ktu-yellow:       #fcd34d;   /* accent for impostor / risk */
  --ink:              #0e1a17;
  --slate:            #4a5a55;
  --line:             #cfd9d5;
  --bg:               #f7faf8;
  --card:             #ffffff;
  --shadow:           0 6px 24px rgba(0, 60, 45, .08);
  --radius:           14px;
  --maxw:             1180px;
  --mono: ui-monospace, SFMono-Regular, "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto,
          "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
img, canvas, svg { display: block; max-width: 100%; }
a { color: var(--ktu-green); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- header ---------- */
.ioh-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.92);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.ioh-header .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.brand { display: flex; align-items: center; gap: 12px; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand-text strong { font-size: 17px; letter-spacing: .2px; display: block; }
.brand-text em     { font-style: normal; font-size: 12px; color: var(--slate); letter-spacing: 1.2px; text-transform: uppercase; }
.ioh-nav a {
  margin-left: 22px;
  color: var(--ink);
  font-weight: 500;
  font-size: 14px;
}
.ioh-nav a:hover { color: var(--ktu-green); text-decoration: none; }

/* ---------- hero ---------- */
.hero {
  padding: 80px 0 60px;
  background:
    radial-gradient(ellipse at 80% 20%, rgba(26, 163, 122, .12), transparent 60%),
    radial-gradient(ellipse at 10% 90%, rgba(0, 92, 70, .08),  transparent 60%),
    linear-gradient(180deg, #ffffff 0%, var(--bg) 100%);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 56px;
  align-items: center;
}
.kicker {
  display: inline-block;
  margin: 0 0 18px;
  padding: 4px 12px;
  border: 1px solid var(--ktu-green);
  border-radius: 999px;
  color: var(--ktu-green);
  font-size: 12px;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  background: var(--ktu-mint);
}
.hero h1 {
  font-size: clamp(30px, 4.4vw, 50px);
  line-height: 1.1;
  letter-spacing: -.5px;
  margin: 8px 0 18px;
}
.hero .lead { font-size: 18px; color: var(--slate); max-width: 540px; }
.cta-row { display: flex; gap: 12px; margin-top: 26px; flex-wrap: wrap; }

.btn {
  display: inline-block; cursor: pointer;
  padding: 12px 22px;
  border-radius: 999px;
  border: 1px solid var(--ktu-green);
  font-weight: 600;
  font-family: inherit;
  font-size: 14px;
  letter-spacing: .2px;
  transition: transform .12s ease, box-shadow .2s ease, background .2s ease;
}
.btn.primary { background: var(--ktu-green); color: #fff; }
.btn.primary:hover { background: var(--ktu-green-dark); text-decoration: none; box-shadow: var(--shadow); transform: translateY(-1px); }
.btn.ghost { background: transparent; color: var(--ktu-green); }
.btn.ghost:hover { background: var(--ktu-mint); text-decoration: none; }

.hero-tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 28px 0 0; padding: 0; list-style: none; }
.hero-tags li {
  font-size: 12px; padding: 6px 10px;
  background: #fff; border: 1px solid var(--line); border-radius: 999px;
  color: var(--slate); letter-spacing: .4px;
}
.hero-art {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
}

/* ---------- generic section ---------- */
.section { padding: 72px 0; }
.section.alt { background: #fff; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section h2 { font-size: clamp(24px, 2.6vw, 32px); margin: 0 0 8px; }
.section .sub { color: var(--slate); max-width: 800px; margin: 0 0 28px; }
.section.two-col .container { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }

/* ---------- four-layer cards ---------- */
.layers {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}
.layer {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
  position: relative;
  transition: transform .15s ease, box-shadow .2s ease;
}
.layer:hover { transform: translateY(-2px); box-shadow: 0 14px 32px rgba(0,60,45,.12); }
.layer .badge {
  position: absolute; top: 18px; right: 18px;
  background: var(--ktu-green); color: #fff;
  font-weight: 700; font-size: 12px; letter-spacing: 1px;
  padding: 4px 8px; border-radius: 6px;
}
.layer h3 { margin: 0 0 12px; font-size: 18px; color: var(--ktu-green-dark); }
.layer ul { margin: 0; padding-left: 18px; color: var(--slate); }

/* ---------- simulator ---------- */
.sim-grid {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 32px;
  align-items: start;
}
.controls {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
  position: sticky; top: 80px;
}
.controls fieldset { border: none; padding: 0; margin: 0 0 18px; }
.controls legend {
  font-size: 11px; font-weight: 700; letter-spacing: 1.2px;
  color: var(--ktu-green); text-transform: uppercase;
  margin-bottom: 8px;
}
.controls label {
  display: block; font-size: 13px; color: var(--slate);
  margin-bottom: 12px;
}
.controls input[type="range"] {
  width: 100%; accent-color: var(--ktu-green); margin-top: 4px;
}
.controls input[type="number"], .controls select {
  width: 100%; padding: 6px 8px; margin-top: 4px;
  border: 1px solid var(--line); border-radius: 8px; font-family: inherit;
  background: #fff;
}
.controls output {
  float: right; font-family: var(--mono); font-size: 12px;
  color: var(--ktu-green-dark);
}
.control-actions { display: flex; gap: 8px; margin-top: 8px; }
.control-actions .btn { flex: 1; padding: 10px 14px; }

.outputs { min-width: 0; }

.kpis {
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px;
  margin-bottom: 18px;
}
.kpi {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 14px 16px; text-align: left;
  box-shadow: var(--shadow);
}
.kpi .lbl { display: block; font-size: 11px; letter-spacing: 1.2px;
            color: var(--slate); text-transform: uppercase; }
.kpi .val { display: block; font-family: var(--mono); font-size: 22px;
            color: var(--ktu-green-dark); margin-top: 4px; }

.chart-row { display: grid; grid-template-columns: 1.6fr 1fr; gap: 16px; margin-bottom: 16px; }
.chart-row .card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 14px; box-shadow: var(--shadow); margin: 0;
}
.chart-row figcaption {
  font-size: 12px; letter-spacing: 1.2px; text-transform: uppercase;
  color: var(--slate); margin-bottom: 8px;
}
.chart-row canvas { width: 100% !important; height: auto !important; }

.legend { font-size: 12px; color: var(--slate); margin: 8px 0 0; }
.dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; vertical-align: middle; margin-right: 4px; }
.c-normal   { background: var(--ktu-green-light); }
.c-impostor { background: var(--ktu-yellow); }
.c-thr      { background: var(--ktu-green-dark); }
.c-subject  { background: var(--ktu-green); }

.permalink { margin-top: 12px; font-size: 13px; }
.permalink summary { cursor: pointer; color: var(--ktu-green); }
.permalink pre {
  background: #fff; border: 1px solid var(--line); border-radius: 8px;
  padding: 10px; font-size: 12px; overflow-x: auto;
}

/* ---------- results / paper ---------- */
.results-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px;
}
.result {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 26px; text-align: center;
  box-shadow: var(--shadow);
}
.result .big { font-size: 42px; font-weight: 700; color: var(--ktu-green); letter-spacing: -.5px; }
.result .small { font-size: 13px; color: var(--slate); margin-top: 6px; }

.cite {
  background: #0e1a17; color: #cce8de; border-radius: var(--radius);
  padding: 16px 18px; font-family: var(--mono); font-size: 13px;
  overflow-x: auto;
}
.cite code { background: transparent; padding: 0; color: inherit; }
.links .btn { margin-right: 8px; margin-top: 8px; }

/* ---------- footer ---------- */
.ioh-footer {
  background: var(--ktu-green-dark); color: #cce8de;
  padding: 22px 0;
  font-size: 13px;
}
.ioh-footer .container { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.ioh-footer a { color: #ffffff; }

/* ---------- responsive ---------- */
@media (max-width: 980px) {
  .hero-grid, .sim-grid, .section.two-col .container { grid-template-columns: 1fr; gap: 28px; }
  .layers { grid-template-columns: repeat(2, 1fr); }
  .results-grid { grid-template-columns: repeat(2, 1fr); }
  .kpis { grid-template-columns: repeat(2, 1fr); }
  .chart-row { grid-template-columns: 1fr; }
  .controls { position: static; }
  .ioh-nav a { margin-left: 12px; font-size: 13px; }
}