/* ============================================================
   salauddin.net — design tokens
   Palette carried over from FOREWARN / Start Bangladesh Hub brand
   ============================================================ */
:root {
  --navy: #033243;
  --navy-light: #0a4a63;
  --teal: #1fa087;
  --teal-dark: #167a68;
  --amber: #d68c1f;
  --amber-light: #f0a83a;
  --bg: #f6f8f8;
  --surface: #ffffff;
  --ink: #1b2a2f;
  --ink-soft: #4d5c60;
  --border: #e0e6e6;

  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'IBM Plex Sans', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  --radius: 10px;
  --max-w: 1120px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation: none !important; transition: none !important; }
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--navy);
  line-height: 1.15;
  margin: 0 0 0.5em;
}

h1 { font-size: clamp(2.2rem, 5vw, 3.4rem); letter-spacing: -0.01em; }
h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); }
h3 { font-size: 1.25rem; }

p { margin: 0 0 1em; color: var(--ink-soft); }

a { color: var(--teal-dark); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

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

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--teal-dark);
  display: inline-block;
  margin-bottom: 0.6em;
}

/* ---------- Header ---------- */
header.site {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(246, 248, 248, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  max-width: var(--max-w);
  margin: 0 auto;
}
.brand {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--navy);
  text-decoration: none;
}
.brand:hover { text-decoration: none; }
.brand span { color: var(--teal); }

.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.94rem;
  font-weight: 500;
}
.nav-links a {
  color: var(--ink);
  padding: 4px 0;
  border-bottom: 2px solid transparent;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--navy);
  border-bottom-color: var(--amber);
  text-decoration: none;
}
.nav-toggle { display: none; }

@media (max-width: 780px) {
  .nav-links {
    position: fixed;
    top: 64px; left: 0; right: 0;
    flex-direction: column;
    background: var(--surface);
    padding: 20px 24px 28px;
    gap: 16px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-140%);
    transition: transform 0.25s ease;
  }
  .nav-links.open { transform: translateY(0); }
  .nav-toggle {
    display: block;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--navy);
    cursor: pointer;
  }
}

/* ---------- Hero (with contour signature) ---------- */
.hero {
  position: relative;
  overflow: hidden;
  background: var(--navy);
  color: #fff;
  padding: 90px 0 70px;
}
.hero .contour-field {
  position: absolute;
  inset: 0;
  opacity: 0.35;
  pointer-events: none;
}
.hero-inner {
  position: relative;
  z-index: 2;
  max-width: 760px;
}
.hero .eyebrow { color: var(--amber-light); }
.hero h1 { color: #fff; }
.hero p.lead {
  color: #cfe3e3;
  font-size: 1.15rem;
  max-width: 620px;
}
.hero-actions {
  display: flex;
  gap: 14px;
  margin-top: 1.8em;
  flex-wrap: wrap;
}

.btn {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 12px 22px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  display: inline-block;
}
.btn-primary { background: var(--amber); color: var(--navy); }
.btn-primary:hover { background: var(--amber-light); text-decoration: none; }
.btn-ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,0.4); }
.btn-ghost:hover { border-color: #fff; text-decoration: none; }
.btn-outline { background: transparent; color: var(--navy); border-color: var(--navy); }
.btn-outline:hover { background: var(--navy); color: #fff; text-decoration: none; }

/* ---------- Sections ---------- */
section { padding: 68px 0; }
section.alt { background: var(--surface); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-head { max-width: 640px; margin-bottom: 2.4em; }

/* ---------- Cards ---------- */
.grid {
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.card h3 { margin-bottom: 0.2em; }
.card p { font-size: 0.95rem; margin-bottom: 0.6em; }
.card .tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: auto; }

.tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--ink-soft);
}
.tag.status-operational { background: #e6f6f2; color: var(--teal-dark); border-color: #bfe8dd; }
.tag.status-pilot { background: #fdf1de; color: #93610f; border-color: #f2dbb0; }
.tag.status-roadmap { background: #eef1f1; color: var(--ink-soft); border-color: var(--border); }

/* ---------- About / bio ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: start;
}
@media (max-width: 800px) { .about-grid { grid-template-columns: 1fr; } }
.stat-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.stat-list li {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--ink-soft);
  border-left: 2px solid var(--teal);
  padding-left: 12px;
}
.stat-list strong { display: block; font-family: var(--font-display); font-size: 1.4rem; color: var(--navy); }

/* ---------- Blog / teaching list ---------- */
.post-row {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.post-row:last-child { border-bottom: none; }
.post-row time { font-family: var(--font-mono); font-size: 0.8rem; color: var(--ink-soft); white-space: nowrap; }
.post-row h3 { margin: 0 0 4px; }
.post-row .excerpt { margin: 0; font-size: 0.92rem; }

/* ---------- Contact ---------- */
.contact-form { display: grid; gap: 16px; max-width: 560px; }
.contact-form label { font-size: 0.85rem; font-weight: 600; color: var(--navy); }
.contact-form input, .contact-form textarea {
  width: 100%;
  padding: 11px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  font-family: var(--font-body);
  font-size: 0.95rem;
  background: var(--surface);
}
.contact-form textarea { min-height: 130px; resize: vertical; }
.form-status { font-family: var(--font-mono); font-size: 0.85rem; min-height: 1.2em; }
.form-status.ok { color: var(--teal-dark); }
.form-status.err { color: #b3401f; }

/* ---------- Footer ---------- */
footer.site {
  background: var(--navy);
  color: #cfe3e3;
  padding: 40px 0 30px;
  font-size: 0.9rem;
}
footer.site a { color: #fff; }
.footer-grid {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}
.footer-links { display: flex; gap: 18px; list-style: none; padding: 0; margin: 0; }

/* ---------- Utility ---------- */
.muted { color: var(--ink-soft); }
.center { text-align: center; }
.mt-lg { margin-top: 2.4em; }