/* ========================================================
   SALVOR PHARMACEUTICALS — Design System & Styles
   ======================================================== */

/* ---------- CSS Variables / Design Tokens ---------- */
:root {
  /* Brand Colors */
  --brand-primary: #2196F3;
  --brand-primary-dark: #1565C0;
  --brand-primary-deeper: #0D47A1;
  --brand-primary-light: #BBDEFB;
  --brand-accent: #00BCD4;

  /* Neutrals */
  --white: #FFFFFF;
  --gray-50: #F8FAFC;
  --gray-100: #F1F5F9;
  --gray-200: #E2E8F0;
  --gray-300: #CBD5E1;
  --gray-500: #64748B;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1E293B;
  --gray-900: #0F172A;

  /* Gradients */
  --gradient-brand: linear-gradient(135deg, #2196F3 0%, #0D47A1 100%);
  --gradient-hero: linear-gradient(135deg, rgba(13,71,161,.92) 0%, rgba(33,150,243,.80) 100%);
  --gradient-card: linear-gradient(135deg, rgba(255,255,255,.08) 0%, rgba(255,255,255,.02) 100%);
  --gradient-text: linear-gradient(135deg, #2196F3 0%, #00BCD4 100%);

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,.07);
  --shadow-lg: 0 10px 40px rgba(0,0,0,.10);
  --shadow-xl: 0 20px 60px rgba(0,0,0,.12);
  --shadow-glow: 0 0 30px rgba(33,150,243,.25);

  /* Typography */
  --font-heading: 'Outfit', sans-serif;
  --font-body: 'Inter', sans-serif;

  /* Spacing */
  --section-py: 100px;
  --container-max: 1200px;

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 50%;

  /* Transitions */
  --ease: cubic-bezier(.4, 0, .2, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--gray-700);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; transition: color .3s var(--ease); }
ul { list-style: none; }

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Utility ---------- */
.text-gradient {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-tag {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--brand-primary);
  background: var(--brand-primary-light);
  padding: 6px 16px;
  border-radius: 50px;
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 16px;
  line-height: 1.2;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--gray-500);
  max-width: 620px;
  margin: 0 auto 48px;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section {
  padding: var(--section-py) 0;
  position: relative;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: .95rem;
  padding: 14px 32px;
  border-radius: 50px;
  border: none;
  cursor: pointer;
  transition: all .35s var(--ease);
  letter-spacing: .3px;
}

.btn-primary {
  background: var(--gradient-brand);
  color: var(--white);
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 40px rgba(33,150,243,.4);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border: 2px solid rgba(255,255,255,.5);
}

.btn-outline:hover {
  background: rgba(255,255,255,.12);
  border-color: var(--white);
  transform: translateY(-2px);
}

.btn-full { width: 100%; justify-content: center; }

/* ===============================================
   NAVBAR
   =============================================== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: all .4s var(--ease);
}

.navbar.scrolled {
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow-md);
  padding: 10px 0;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ---- Brand Mark (shared navbar + footer) ---- */
.logo-mark {
  width: 44px;
  height: 32px;
  overflow: hidden;
  border-radius: 50%;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo-mark img {
  width: 56px;
  height: auto;
  clip-path: ellipse(48% 46% at 50% 50%);
  display: block;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.logo-name {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: .5px;
}

.logo-sub {
  font-family: var(--font-body);
  font-size: .6rem;
  font-weight: 500;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  opacity: .7;
}

/* ---- Navbar logo ---- */
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  position: relative;
  transition: all .3s var(--ease);
}

.nav-logo:hover {
  transform: translateY(-1px);
}

/* Default (over hero): keep blue logo, white text */
.navbar:not(.scrolled) .logo-name { color: var(--white); }
.navbar:not(.scrolled) .logo-sub { color: rgba(255,255,255,.7); }
.navbar:not(.scrolled) .logo-mark img {
  filter: none;
}

/* Scrolled: blue logo on white navbar */
.navbar.scrolled .logo-name { color: var(--brand-primary-deeper); }
.navbar.scrolled .logo-sub { color: var(--gray-500); }
.navbar.scrolled .logo-mark img {
  filter: none;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: .9rem;
  padding: 8px 16px;
  border-radius: 50px;
  color: rgba(255,255,255,.85);
  transition: all .3s var(--ease);
}

.nav-link:hover,
.nav-link.active {
  color: var(--white);
  background: rgba(255,255,255,.15);
}

.navbar.scrolled .nav-link {
  color: var(--gray-600);
}

.navbar.scrolled .nav-link:hover,
.navbar.scrolled .nav-link.active {
  color: var(--brand-primary);
  background: var(--brand-primary-light);
}

.nav-link--cta {
  background: var(--gradient-brand) !important;
  color: var(--white) !important;
  padding: 10px 24px;
}

.nav-link--cta:hover {
  box-shadow: var(--shadow-glow);
  transform: translateY(-1px);
}

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
}

.nav-toggle span {
  width: 26px; height: 3px;
  background: var(--white);
  border-radius: 4px;
  transition: all .3s var(--ease);
}

.navbar.scrolled .nav-toggle span { background: var(--gray-700); }

/* ===============================================
   HERO
   =============================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
}

.hero-bg img {
  width: 100%; height: 100%;
  object-fit: cover;
  transform: scale(1.05);
  animation: heroZoom 20s ease-in-out infinite alternate;
}

@keyframes heroZoom {
  0% { transform: scale(1.05); }
  100% { transform: scale(1.12); }
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: var(--gradient-hero);
}

.hero-content {
  position: relative;
  z-index: 2;
  padding-top: 80px;
}

.hero-badge {
  display: inline-block;
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--white);
  background: rgba(255,255,255,.15);
  backdrop-filter: blur(8px);
  padding: 8px 20px;
  border-radius: 50px;
  border: 1px solid rgba(255,255,255,.25);
  margin-bottom: 24px;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 6vw, 4.2rem);
  font-weight: 800;
  color: var(--white);
  line-height: 1.12;
  margin-bottom: 24px;
}

.hero-title .text-gradient {
  background: linear-gradient(135deg, #BBDEFB 0%, #00BCD4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: rgba(255,255,255,.8);
  max-width: 560px;
  margin-bottom: 36px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* Scroll Indicator */
.hero-scroll-indicator {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: rgba(255,255,255,.6);
  font-size: .75rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  z-index: 2;
}

.mouse {
  width: 26px; height: 40px;
  border: 2px solid rgba(255,255,255,.5);
  border-radius: 14px;
  position: relative;
}

.wheel {
  width: 4px; height: 8px;
  background: var(--white);
  border-radius: 4px;
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  animation: scrollWheel 2s ease infinite;
}

@keyframes scrollWheel {
  0% { opacity: 1; transform: translateX(-50%) translateY(0); }
  100% { opacity: 0; transform: translateX(-50%) translateY(14px); }
}

/* ===============================================
   ABOUT
   =============================================== */
.about { background: var(--gray-50); }

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.about-image {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.about-image img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  width: 100%;
}

.about-image-accent {
  position: absolute;
  bottom: -20px; right: -20px;
  width: 200px; height: 200px;
  background: var(--gradient-brand);
  border-radius: var(--radius-lg);
  z-index: -1;
  opacity: .3;
}

.about-text {
  font-size: 1rem;
  color: var(--gray-600);
  margin-bottom: 16px;
}

.about-values {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 28px;
}

.value-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.value-icon {
  width: 48px; height: 48px;
  min-width: 48px;
  background: var(--gradient-brand);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 1.1rem;
}

.value-item h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--gray-800);
  margin-bottom: 4px;
}

.value-item p {
  font-size: .9rem;
  color: var(--gray-500);
  line-height: 1.5;
}

/* ===============================================
   PRODUCTS
   =============================================== */
.products { background: var(--white); }

.products-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}

.product-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  text-align: center;
  transition: all .4s var(--ease);
  position: relative;
  overflow: hidden;
}

.product-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: var(--gradient-brand);
  transform: scaleX(0);
  transition: transform .4s var(--ease);
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--brand-primary-light);
}

.product-card:hover::before { transform: scaleX(1); }

.product-card-icon {
  width: 72px; height: 72px;
  margin: 0 auto 20px;
  background: linear-gradient(135deg, var(--brand-primary-light) 0%, rgba(33,150,243,.15) 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  color: var(--brand-primary);
  transition: all .4s var(--ease);
}

.product-card:hover .product-card-icon {
  background: var(--gradient-brand);
  color: var(--white);
  transform: scale(1.08);
}

.product-card h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--gray-800);
  margin-bottom: 12px;
}

.product-card p {
  font-size: .9rem;
  color: var(--gray-500);
  line-height: 1.6;
  margin-bottom: 16px;
}

.product-tag {
  display: inline-block;
  font-size: .75rem;
  font-weight: 600;
  color: var(--brand-primary);
  background: var(--brand-primary-light);
  padding: 4px 14px;
  border-radius: 50px;
}

/* ===============================================
   RESEARCH / STATS
   =============================================== */
.research {
  background: var(--gray-900);
  color: var(--white);
  overflow: hidden;
}

.research .section-tag {
  background: rgba(33,150,243,.2);
  color: var(--brand-primary-light);
}

.research .section-title { color: var(--white); }
.research .section-desc { color: rgba(255,255,255,.6); }

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
  margin-bottom: 64px;
}

.stat-card {
  text-align: center;
  padding: 32px 20px;
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(8px);
  transition: all .4s var(--ease);
}

.stat-card:hover {
  background: rgba(255,255,255,.1);
  transform: translateY(-4px);
}

.stat-number {
  font-family: var(--font-heading);
  font-size: 2.8rem;
  font-weight: 800;
  display: inline;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-suffix {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  display: inline;
  color: var(--brand-accent);
}

.stat-label {
  font-size: .9rem;
  color: rgba(255,255,255,.6);
  margin-top: 8px;
}

.research-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.research-feature {
  text-align: center;
  padding: 32px 24px;
  border: 1px solid rgba(255,255,255,.08);
  border-radius: var(--radius-lg);
  transition: all .4s var(--ease);
}

.research-feature:hover {
  background: rgba(255,255,255,.05);
  transform: translateY(-4px);
}

.research-feature i {
  font-size: 2rem;
  color: var(--brand-primary);
  margin-bottom: 16px;
}

.research-feature h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--white);
}

.research-feature p {
  font-size: .9rem;
  color: rgba(255,255,255,.55);
  line-height: 1.6;
}

/* ===============================================
   CERTIFICATIONS
   =============================================== */
.certifications { background: var(--gray-50); }

.cert-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.cert-card {
  text-align: center;
  padding: 40px 28px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  transition: all .4s var(--ease);
}

.cert-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--brand-primary-light);
}

.cert-icon {
  width: 64px; height: 64px;
  margin: 0 auto 16px;
  background: var(--gradient-brand);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 1.4rem;
}

.cert-card h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--gray-800);
  margin-bottom: 8px;
}

.cert-card p {
  font-size: .88rem;
  color: var(--gray-500);
}

/* ===============================================
   CONTACT
   =============================================== */
.contact { background: var(--white); }

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: flex-start;
}

.contact-desc {
  color: var(--gray-500);
  margin-bottom: 32px;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.contact-item-icon {
  width: 48px; height: 48px;
  min-width: 48px;
  background: var(--brand-primary-light);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--brand-primary);
  font-size: 1.1rem;
}

.contact-item h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--gray-800);
  margin-bottom: 4px;
}

.contact-item p {
  font-size: .9rem;
  color: var(--gray-500);
  line-height: 1.5;
}

/* Contact Form */
.contact-form {
  background: var(--gray-50);
  padding: 40px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: .9rem;
  color: var(--gray-700);
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  font-family: var(--font-body);
  font-size: .95rem;
  padding: 14px 18px;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  background: var(--white);
  color: var(--gray-800);
  transition: all .3s var(--ease);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 4px rgba(33,150,243,.12);
}

.form-group textarea { resize: vertical; }

/* ===============================================
   FOOTER
   =============================================== */
.footer {
  background: var(--gray-900);
  color: rgba(255,255,255,.7);
  padding-top: 64px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}

/* ---- Footer Brand Mark ---- */
.footer-logo-link {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  transition: all .3s var(--ease);
}

.footer-logo-link:hover {
  opacity: .9;
  transform: translateY(-1px);
}

.logo-mark--footer img {
  filter: none;
}

.logo-text--footer .logo-name {
  color: var(--white);
}

.logo-text--footer .logo-sub {
  color: rgba(255,255,255,.5);
}

.footer-brand p {
  font-size: .9rem;
  line-height: 1.7;
  margin-bottom: 20px;
  color: rgba(255,255,255,.5);
}

.footer-socials {
  display: flex;
  gap: 12px;
}

.footer-socials a {
  width: 40px; height: 40px;
  background: rgba(255,255,255,.08);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,.6);
  font-size: .95rem;
  transition: all .3s var(--ease);
}

.footer-socials a:hover {
  background: var(--brand-primary);
  color: var(--white);
  transform: translateY(-2px);
}

.footer-links h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--white);
  margin-bottom: 20px;
  font-size: 1rem;
}

.footer-links ul { display: flex; flex-direction: column; gap: 10px; }

.footer-links a {
  font-size: .9rem;
  color: rgba(255,255,255,.5);
  transition: all .3s var(--ease);
}

.footer-links a:hover {
  color: var(--brand-primary);
  padding-left: 4px;
}

.footer-bottom {
  padding: 20px 0;
  text-align: center;
  font-size: .85rem;
  color: rgba(255,255,255,.35);
}

/* ===============================================
   SCROLL ANIMATIONS
   =============================================== */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===============================================
   RESPONSIVE
   =============================================== */
@media (max-width: 1024px) {
  .products-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .cert-grid { grid-template-columns: repeat(2, 1fr); }
  .research-features { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 768px) {
  :root { --section-py: 72px; }

  /* Mobile nav */
  .nav-toggle { display: flex; }

  .nav-menu {
    position: fixed;
    top: 0; right: -100%;
    width: 280px;
    height: 100vh;
    flex-direction: column;
    background: var(--white);
    padding: 80px 32px 32px;
    gap: 4px;
    box-shadow: var(--shadow-xl);
    transition: right .4s var(--ease);
  }

  .nav-menu.open { right: 0; }

  .nav-menu .nav-link {
    color: var(--gray-700);
    width: 100%;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
  }

  .nav-menu .nav-link:hover,
  .nav-menu .nav-link.active {
    color: var(--brand-primary);
    background: var(--brand-primary-light);
  }

  /* About */
  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-image { order: -1; }

  /* Products */
  .products-grid { grid-template-columns: 1fr; }

  /* Stats */
  .stats-grid { grid-template-columns: 1fr 1fr; }

  /* Research */
  .research-features { grid-template-columns: 1fr; }

  /* Certs */
  .cert-grid { grid-template-columns: 1fr; }

  /* Contact */
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  /* Footer */
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

@media (max-width: 480px) {
  .hero-title { font-size: 2rem; }
  .hero-subtitle { font-size: 1rem; }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .hero-actions .btn { width: 100%; justify-content: center; }

  .stats-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
  .stat-number { font-size: 2rem; }

  .contact-form { padding: 24px; }
}