/* =====================================================================
   VEL LIFE SCIENCES — Design Tokens & Base Styles
   ===================================================================== */

:root {
  /* Color */
  --blue-900: #063A66;
  --blue-800: #08497D;
  --blue-700: #0B4F8A;
  --blue-600: #1467AC;
  --blue-50:  #EAF3FA;
  --green-600: #1FA35C;
  --green-500: #29BE6C;
  --grey-900: #1A2027;
  --grey-600: #5B6472;
  --grey-300: #D7DDE3;
  --grey-100: #F4F7FA;
  --white: #FFFFFF;

  /* Type */
  --font-display: 'Sora', 'Segoe UI', sans-serif;
  --font-body: 'IBM Plex Sans', 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  /* Layout */
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-card: 0 8px 30px rgba(6, 58, 102, 0.08);
  --shadow-card-hover: 0 16px 40px rgba(6, 58, 102, 0.14);
  --container-max: 1240px;
  --transition: 220ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--grey-900);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--blue-900);
  line-height: 1.2;
  margin: 0 0 0.5em;
}

a { color: var(--blue-700); text-decoration: none; }
img { max-width: 100%; display: block; }

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

/* -----------------------------------------------------------------
   Signature motif: thin hex-grid line pattern (brand-derived), used
   as a very low-opacity background texture, never as decoration for
   its own sake.
------------------------------------------------------------------ */
.hex-pattern {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.08;
  background-image:
    linear-gradient(30deg, var(--white) 12%, transparent 12.5%, transparent 87%, var(--white) 87.5%, var(--white)),
    linear-gradient(150deg, var(--white) 12%, transparent 12.5%, transparent 87%, var(--white) 87.5%, var(--white)),
    linear-gradient(30deg, var(--white) 12%, transparent 12.5%, transparent 87%, var(--white) 87.5%, var(--white)),
    linear-gradient(150deg, var(--white) 12%, transparent 12.5%, transparent 87%, var(--white) 87.5%, var(--white)),
    linear-gradient(60deg, rgba(255,255,255,0.5) 25%, transparent 25.5%, transparent 75%, rgba(255,255,255,0.5) 75%, rgba(255,255,255,0.5));
  background-size: 64px 112px;
  background-position: 0 0, 0 0, 32px 56px, 32px 56px, 0 0;
}

/* -----------------------------------------------------------------
   Buttons
------------------------------------------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 14px 28px;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--green-600); color: var(--white); }
.btn-primary:hover { background: var(--green-500); box-shadow: 0 10px 24px rgba(31,163,92,0.3); }
.btn-outline { background: transparent; border-color: var(--white); color: var(--white); }
.btn-outline:hover { background: rgba(255,255,255,0.12); }
.btn:focus-visible { outline: 3px solid var(--blue-600); outline-offset: 2px; }

/* -----------------------------------------------------------------
   Header
------------------------------------------------------------------ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--white);
  box-shadow: 0 2px 16px rgba(6,58,102,0.06);
  transition: background var(--transition), box-shadow var(--transition);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 84px;
}
.site-header .logo { display: flex; align-items: center; gap: 12px; }
.site-header .logo img { height: 48px; width: auto; }
.site-header .logo-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--blue-900);
  letter-spacing: 0.02em;
}

.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  color: var(--grey-900);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 10px 16px;
  border-radius: 8px;
  transition: color var(--transition), background var(--transition);
}
.main-nav a:hover, .main-nav a.active { color: var(--blue-700); background: var(--blue-50); }

.header-actions { display: flex; align-items: center; gap: 16px; }
.header-cta {
  background: var(--blue-700);
  color: var(--white);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  transition: background var(--transition), transform var(--transition);
}
.header-cta:hover { background: var(--blue-800); transform: translateY(-2px); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span { width: 26px; height: 2px; background: var(--blue-900); border-radius: 2px; transition: transform var(--transition), opacity var(--transition); }

@media (max-width: 960px) {
  .main-nav { position: fixed; top: 84px; left: 0; right: 0; bottom: 0; background: var(--white);
    flex-direction: column; align-items: stretch; padding: 24px; gap: 4px;
    transform: translateX(100%); transition: transform var(--transition); overflow-y: auto; }
  .main-nav.open { transform: translateX(0); }
  .main-nav a { padding: 16px; font-size: 1.05rem; }
  .header-cta { display: none; }
  .main-nav .mobile-cta { display: inline-flex; margin-top: 12px; }
  .nav-toggle { display: flex; }
  .nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle.open span:nth-child(2) { opacity: 0; }
  .nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}

/* -----------------------------------------------------------------
   Footer
------------------------------------------------------------------ */
.site-footer { background: var(--blue-900); color: rgba(255,255,255,0.85); position: relative; overflow: hidden; }
.site-footer .container { position: relative; z-index: 1; padding-top: 64px; padding-bottom: 32px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 40px; padding-bottom: 40px; }
.footer-grid h4 { color: var(--white); font-size: 1rem; margin-bottom: 18px; }
.footer-grid a { color: rgba(255,255,255,0.75); display: block; padding: 6px 0; transition: color var(--transition); }
.footer-grid a:hover { color: var(--green-500); }
.footer-brand .logo-text { color: var(--white); font-family: var(--font-display); font-weight: 700; font-size: 1.1rem; }
.footer-brand p { color: rgba(255,255,255,0.65); font-size: 0.92rem; max-width: 320px; }
.footer-social { display: flex; gap: 12px; margin-top: 16px; }
.footer-social a { width: 38px; height: 38px; border-radius: 50%; border: 1px solid rgba(255,255,255,0.25);
  display: flex; align-items: center; justify-content: center; padding: 0; }
.footer-social a:hover { background: var(--green-600); border-color: var(--green-600); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.12); padding-top: 24px; display: flex;
  justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; font-size: 0.85rem; color: rgba(255,255,255,0.6); }
.footer-bottom a { color: rgba(255,255,255,0.6); padding: 0; }
.footer-bottom-links { display: flex; gap: 20px; }

@media (max-width: 860px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* -----------------------------------------------------------------
   WhatsApp floating button
------------------------------------------------------------------ */
.whatsapp-float {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 999;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: #25D366;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 24px rgba(37,211,102,0.4);
  transition: transform var(--transition);
}
.whatsapp-float:hover { transform: scale(1.08); }
.whatsapp-float svg { width: 30px; height: 30px; fill: var(--white); }