/* ============================================================
   CSI — Cognitive Standards Institute
   Global Stylesheet
   ============================================================ */

/* ── Google Fonts ── */
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@400;600;700&family=Inter:wght@300;400;500;600&display=swap');

/* ── CSS Variables ── */
:root {
  --navy:     #1B2A4A;
  --gold:     #C9A84C;
  --gold-light: #d9b86a;
  --bg:       #F5F4F0;
  --white:    #ffffff;
  --text:     #1A1A1A;
  --secondary:#5A5A72;
  --border:   #e0ddd6;
  --shadow:   0 4px 24px rgba(27,42,74,0.10);
  --radius:   10px;
  --transition: 0.3s ease;
}

/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: 'Playfair Display', serif;
  line-height: 1.2;
}

a { color: inherit; text-decoration: none; }

img { max-width: 100%; display: block; }

/* ── Utility Classes ── */
.container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 96px 0;
}

.section--dark {
  background: var(--navy);
  color: var(--white);
}

.section-label {
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  color: var(--navy);
  margin-bottom: 16px;
}

.section--dark .section-title {
  color: var(--white);
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--secondary);
  max-width: 640px;
  margin-bottom: 48px;
  line-height: 1.7;
}

.section--dark .section-subtitle {
  color: rgba(255,255,255,0.7);
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 6px;
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: var(--transition);
  text-decoration: none;
}

.btn-gold {
  background: var(--gold);
  color: var(--navy);
  border-color: var(--gold);
}

.btn-gold:hover {
  background: var(--gold-light);
  border-color: var(--gold-light);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(201,168,76,0.35);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,0.5);
}

.btn-outline:hover {
  background: rgba(255,255,255,0.1);
  border-color: var(--white);
}

.btn-outline--dark {
  color: var(--navy);
  border-color: var(--navy);
}

.btn-outline--dark:hover {
  background: var(--navy);
  color: var(--white);
}

/* ── Navigation ── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(245,244,240,0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: all var(--transition);
  padding: 0;
}

.nav.scrolled {
  border-bottom-color: var(--border);
  box-shadow: 0 2px 20px rgba(27,42,74,0.08);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  transition: height var(--transition);
}

.nav.scrolled .nav__inner {
  height: 60px;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.nav__logo-text {
  display: flex;
  flex-direction: column;
}

.nav__logo-name {
  font-family: 'Playfair Display', serif;
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
  line-height: 1.2;
}

.nav__logo-sub {
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--secondary);
  font-weight: 500;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav__links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--secondary);
  transition: color var(--transition);
}

.nav__links a:hover { color: var(--navy); }

.nav__cta { margin-left: 8px; }

.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}

.nav__hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--navy);
  border-radius: 2px;
  transition: var(--transition);
}

/* ── Footer ── */
.footer {
  background: var(--navy);
  color: var(--white);
  padding: 64px 0 32px;
}

.footer__inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer__brand p {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.6);
  margin-top: 12px;
  max-width: 280px;
}

.footer__col h4 {
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 16px;
}

.footer__col ul {
  list-style: none;
}

.footer__col ul li {
  margin-bottom: 10px;
}

.footer__col ul li a {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.65);
  transition: color var(--transition);
}

.footer__col ul li a:hover { color: var(--white); }

.footer__bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.4);
}

/* ── SVG Logo ── */
.logo-svg { width: 40px; height: 40px; flex-shrink: 0; }

/* ── Cards ── */
.card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

/* ── Tag / Badge ── */
.tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.tag--research  { background: rgba(27,42,74,0.08); color: var(--navy); }
.tag--education { background: rgba(201,168,76,0.15); color: #8a6c1e; }
.tag--neuro     { background: rgba(90,90,114,0.10); color: var(--secondary); }
.tag--psychology{ background: rgba(120,60,60,0.10); color: #783c3c; }
.tag--health    { background: rgba(40,140,90,0.10); color: #287a50; }
.tag--technology{ background: rgba(40,90,160,0.10); color: #285aa0; }
.tag--history   { background: rgba(120,90,40,0.10); color: #785a28; }

/* ── Responsive: Mobile ── */
@media (max-width: 768px) {
  .section { padding: 64px 0; }

  .nav__links { display: none; }
  .nav__cta.desktop-only { display: none; }
  .nav__hamburger { display: flex; }

  .nav__links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg);
    padding: 24px;
    gap: 20px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
  }

  .footer__inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer__bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
}