/* =========================================================
   Databoratory — Bright Yellow & Soft Grey Theme
   ========================================================= */

/* ---------- Design tokens ---------- */
:root {
  /* Core colours */
  --dark: #333333;          /* 80% grey replacing black */
  --text: #1a1a1a;
  --muted-text: #666666;

  /* Accent */
  --yellow: #ffff00;        /* bright yellow */
  --yellow-soft: #fffde6;   /* softened yellow wash */

  /* Surfaces */
  --bg: #f3f3f3;
  --card-bg: #ffffff;
  --border: #e2e2e2;

  /* Layout */
  --max: 980px;
  --grid-gap: 28px;
  --grid-line: rgba(255, 255, 0, 0.12);
  --grid-fade: rgba(255, 255, 0, 0);
}

/* ---------- Reset ---------- */
* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
}

/* ---------- Base ---------- */
body {
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Subtle vertical rhythm grid */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    repeating-linear-gradient(
      to bottom,
      var(--grid-fade) 0px,
      var(--grid-fade) calc(var(--grid-gap) - 1px),
      var(--grid-line) var(--grid-gap)
    );
}

.site-header, main, .site-footer {
  position: relative;
  z-index: 1;
}

/* ---------- Layout ---------- */
.container {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2.75rem 1.25rem;
}

main.container {
  padding-top: 2.25rem;
  padding-bottom: 3.25rem;
}

/* ---------- Header ---------- */
.site-header {
  background: var(--dark);
  border-bottom: 12px solid var(--yellow);
}

.site-header .container {
  padding-top: 1.1rem;
  padding-bottom: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: #ffffff;
}

.brand img {
  height: 80px;
}

.brand span {
  font-weight: 750;
  letter-spacing: 0.3px;
}

/* ---------- Navigation ---------- */
nav a {
  text-decoration: none;
  color: rgba(255, 255, 255, 0.9);
  margin-left: 1.5rem;
  font-weight: 520;
  position: relative;
  padding-bottom: 0.25rem;
}

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

nav a[aria-current="page"] {
  color: var(--yellow);
}

nav a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.15rem;
  height: 2px;
  background: var(--yellow);
  border-radius: 999px;
}

/* ---------- Typography ---------- */
h1 {
  font-size: 2.25rem;
  line-height: 1.18;
  margin: 0 0 0.6rem;
  letter-spacing: -0.018em;
}

h1::after {
  content: "";
  display: block;
  width: 56px;
  height: 4px;
  background: var(--yellow);
  border-radius: 999px;
  margin-top: 0.65rem;
}

h2 {
  font-size: 1.25rem;
  margin: 2.75rem 0 0.75rem;
  letter-spacing: -0.01em;
  position: relative;
}

h2::before {
  content: "";
  position: absolute;
  left: -1.25rem;
  top: 0.35em;
  width: 6px;
  height: 0.9em;
  background: var(--yellow);
  border-radius: 2px;
}

p {
  margin: 0 0 1rem;
}

/* ---------- Tagline ---------- */
.tagline {
  color: var(--muted-text);
  font-size: 1.05rem;
  margin-bottom: 2rem;
  padding-left: 0.9rem;
  border-left: 4px solid var(--yellow);
}

/* ---------- Cards ---------- */
.card {
  background:
    linear-gradient(
      to right,
      var(--yellow-soft),
      var(--card-bg) 70%
    );
  border: 1px solid var(--border);
  border-left: 8px solid var(--yellow);
  border-radius: 10px;
  padding: 1.75rem 2rem;
  margin: 0 0 2rem;
  box-shadow: 0 1px 0 rgba(0,0,0,0.03);
  transition: box-shadow 160ms ease, transform 160ms ease, border-color 160ms ease;
}

.card:hover {
  border-color: #d8d8d8;
  box-shadow: 0 6px 18px rgba(0,0,0,0.06);
  transform: translateY(-1px);
}

/* ---------- Lists ---------- */
ul {
  margin: 0.5rem 0 0;
  padding-left: 1.25rem;
}

li {
  margin: 0.35rem 0;
}

/* ---------- Links ---------- */
a {
  color: var(--text);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--yellow);
}

/* ---------- Button ---------- */
.button {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.68rem 1.4rem;
  background: var(--dark);
  color: #ffffff;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 650;
  border: 1px solid var(--dark);
  transition: background 160ms ease, color 160ms ease, border-color 160ms ease;
}

.button:hover {
  background: var(--yellow);
  border-color: var(--yellow);
  color: var(--dark);
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--dark);
  color: #e0e0e0;
  border-top: 8px solid var(--yellow);
}

.site-footer .container {
  padding-top: 1.75rem;
  padding-bottom: 1.75rem;
  font-size: 0.92rem;
}

.site-footer a {
  color: #e0e0e0;
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--yellow);
}

/* ---------- Responsive ---------- */
@media (max-width: 700px) {
  .site-header .container {
    flex-direction: column;
    align-items: flex-start;
  }

  nav a {
    margin-left: 0;
    margin-right: 1.25rem;
  }

  h1 {
    font-size: 1.95rem;
  }

  h2::before {
    left: -0.75rem;
  }

  .card {
    padding: 1.35rem 1.25rem;
  }
}