/* ===========================================================
   MSC NUTRA — Enhanced B2B Website
   Scientific + Premium + Modern + Multi-page
   =========================================================== */

:root {
  --color-primary: #2b3fb7;
  --color-primary-dark: #1f2e85;
  --color-primary-darker: #16205c;
  --color-accent: #c32832;
  --color-accent-dark: #9c1f29;
  --color-accent-light: #e74c56;
  --color-bg: #ffffff;
  --color-soft: #f5f6fb;
  --color-soft-dark: #eef0f9;
  --color-text: #1a1a2e;
  --color-muted: #5b6378;
  --color-border: #e5e7f0;
  --color-success: #10b981;

  --font-sans: "Poppins", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --max-w: 1200px;
  --radius: 8px;
  --shadow-sm: 0 1px 3px rgba(43, 63, 183, 0.06);
  --shadow-md: 0 12px 32px rgba(43, 63, 183, 0.1);
  --shadow-lg: 0 20px 48px rgba(43, 63, 183, 0.15);
  --shadow-xl: 0 32px 64px rgba(43, 63, 183, 0.2);

  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  overflow-x: hidden;
}

/* ========== ANIMATIONS ========== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.7;
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-8px);
  }
}

/* ========== HEADER & NAVIGATION ========== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
  transition: box-shadow 0.3s;
}

.site-header.scrolled {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.nav {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  animation: slideInLeft 0.6s ease-out;
}

.logo-img {
  height: 45px;
  width: auto;
  object-fit: contain;
}

.brand-text {
  font-weight: 700;
  color: var(--color-primary);
  font-size: 1.1rem;
  letter-spacing: -0.5px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
}

.nav-links a {
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.95rem;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  transition: var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 1rem;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width 0.3s ease;
}

.nav-links a:hover::after {
  width: calc(100% - 2rem);
}

.nav-links a:hover {
  color: var(--color-primary);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-primary);
}

.btn-red-nav {
  background: var(--color-accent) !important;
  color: var(--color-bg) !important;
  padding: 0.75rem 1.5rem !important;
  border-radius: 6px;
  font-weight: 600;
  transition: var(--transition);
}

.btn-red-nav:hover {
  background: var(--color-accent-dark) !important;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-bg);
    padding: 1rem;
    border-top: 1px solid var(--color-border);
    gap: 0;
    box-shadow: var(--shadow-md);
  }

  .nav-links.active {
    display: flex;
  }

  .nav-toggle {
    display: block;
  }

  .nav-links a {
    padding: 1rem;
    width: 100%;
  }

  .nav-links a::after {
    display: none;
  }
}

/* ========== CONTAINER ========== */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ========== HERO SECTION ========== */
.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  padding: 8rem 1.5rem 4rem;
  margin-top: 72px;
  min-height: 600px;
}

.hero-content {
  animation: fadeInUp 0.8s ease-out;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  color: var(--color-primary);
  margin-bottom: 1.5rem;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--color-muted);
  margin-bottom: 2rem;
  line-height: 1.7;
}

.hero-ctas {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.hero-image {
  width: 100%;
  height: 100%;
  min-height: 500px;
  border-radius: 12px;
  object-fit: cover;
  animation: fadeInUp 0.8s ease-out 0.2s backwards;
  box-shadow: var(--shadow-xl);
}

@media (max-width: 768px) {
  .hero {
    grid-template-columns: 1fr;
    padding: 5rem 1.5rem 3rem;
    min-height: auto;
  }

  .hero-image {
    min-height: 300px;
  }
}

/* ========== BUTTONS ========== */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  text-align: center;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  font-family: inherit;
}

.btn-red {
  background: var(--color-accent);
  color: var(--color-bg);
}

.btn-red:hover {
  background: var(--color-accent-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-soft);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: 1rem;
}

.btn-sm {
  padding: 0.6rem 1.2rem;
  font-size: 0.9rem;
}

/* ========== SECTION HEADERS ========== */
.section-header {
  text-align: center;
  margin-bottom: 3rem;
  animation: fadeInUp 0.6s ease-out;
}

.section-header h2 {
  color: var(--color-primary);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--color-muted);
  max-width: 600px;
  margin: 0 auto;
}

.section-center-title {
  text-align: center;
  color: var(--color-primary);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  margin-bottom: 2rem;
  animation: fadeInUp 0.6s ease-out;
}

/* ========== VALUE PROPOSITION CARDS ========== */
.value-prop {
  padding: 4rem 1.5rem;
  background: var(--color-soft);
}

.value-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.value-card {
  background: var(--color-bg);
  padding: 2rem;
  border-radius: 12px;
  border-left: 4px solid var(--color-accent);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  animation: fadeInUp 0.6s ease-out;
}

.value-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.value-number {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
  opacity: 0.9;
}

.value-card h3 {
  color: var(--color-primary);
  margin-bottom: 0.5rem;
  font-size: 1.2rem;
}

.value-card p {
  color: var(--color-muted);
  font-size: 0.95rem;
  margin: 0.5rem 0;
}

/* ========== INGREDIENT CARDS ========== */
.ingredient-card {
  background: var(--color-soft);
  padding: 1.5rem;
  border-radius: 8px;
  text-align: center;
  transition: var(--transition);
  cursor: pointer;
  border: 1px solid transparent;
  animation: scaleIn 0.4s ease-out;
}

.ingredient-card:hover {
  transform: translateY(-6px);
  background: var(--color-bg);
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
}

.ingredient-card h3 {
  color: var(--color-primary);
  font-size: 1rem;
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.ingredient-badge {
  display: inline-block;
  background: var(--color-accent);
  color: var(--color-bg);
  font-size: 0.75rem;
  padding: 0.4rem 0.9rem;
  border-radius: 12px;
  margin-top: 0.75rem;
  font-weight: 600;
  animation: fadeInUp 0.4s ease-out;
}

/* ========== SECTION BACKGROUNDS ========== */
.alt-bg {
  background: var(--color-soft);
}

.dark-bg {
  background: var(--color-primary-darker);
  color: var(--color-bg);
}

.dark-bg h2,
.dark-bg h3 {
  color: var(--color-bg);
}

/* ========== CLINICAL INGREDIENTS SECTION ========== */
.clinical-showcase {
  padding: 4rem 1.5rem;
  background: linear-gradient(135deg, var(--color-soft) 0%, var(--color-soft-dark) 100%);
  border-top: 3px solid var(--color-accent);
}

.clinical-header {
  text-align: center;
  margin-bottom: 1rem;
}

.clinical-header h2 {
  color: var(--color-accent);
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  margin-bottom: 0.5rem;
}

.clinical-tagline {
  color: var(--color-muted);
  font-size: 1.05rem;
  max-width: 700px;
  margin: 0 auto;
}

.clinical-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.clinical-card {
  background: var(--color-bg);
  padding: 2.5rem;
  border-radius: 12px;
  border-top: 4px solid var(--color-accent);
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  animation: fadeInUp 0.6s ease-out;
}

.clinical-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.clinical-card h3 {
  color: var(--color-primary);
  font-size: 1.3rem;
  margin-bottom: 0.5rem;
  font-weight: 700;
}

.clinical-benefits {
  color: var(--color-accent);
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 1rem;
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.benefit-tag {
  background: var(--color-soft);
  padding: 0.4rem 0.9rem;
  border-radius: 12px;
  font-size: 0.8rem;
}

.clinical-card p {
  color: var(--color-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ========== INGREDIENT FILTERS ========== */
.filter-tabs {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
  animation: fadeInUp 0.6s ease-out;
}

.filter-tab {
  background: var(--color-soft);
  color: var(--color-text);
  border: 2px solid transparent;
  padding: 0.75rem 1.5rem;
  border-radius: 20px;
  cursor: pointer;
  transition: var(--transition);
  font-weight: 600;
  font-size: 0.95rem;
}

.filter-tab:hover {
  border-color: var(--color-accent);
  background: var(--color-bg);
}

.filter-tab.active {
  background: var(--color-accent);
  color: var(--color-bg);
  border-color: var(--color-accent);
}

/* ========== INGREDIENT GRID ========== */
.ingredient-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1.5rem;
  animation: fadeInUp 0.6s ease-out;
}

.ingredient-item {
  background: var(--color-soft);
  padding: 1.5rem;
  border-radius: 8px;
  text-align: center;
  border: 1px solid var(--color-border);
  transition: var(--transition);
  animation: scaleIn 0.3s ease-out;
}

.ingredient-item:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent);
  background: var(--color-bg);
  box-shadow: var(--shadow-sm);
}

.ingredient-item h4 {
  color: var(--color-primary);
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.ingredient-item p {
  color: var(--color-muted);
  font-size: 0.85rem;
  margin: 0;
}

/* ========== PROCESS STEPS ========== */
.process-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.process-step {
  background: var(--color-soft);
  padding: 2rem;
  border-radius: 12px;
  text-align: center;
  border-top: 3px solid var(--color-accent);
  transition: var(--transition);
  animation: fadeInUp 0.6s ease-out;
  position: relative;
}

.process-step:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 60px;
  background: var(--color-primary);
  color: var(--color-bg);
  border-radius: 50%;
  font-weight: 700;
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.process-step h3 {
  color: var(--color-primary);
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.process-step p {
  color: var(--color-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ========== FEATURE GRID ========== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.feature-item {
  background: var(--color-soft);
  padding: 2rem;
  border-radius: 12px;
  border-left: 4px solid var(--color-accent);
  transition: var(--transition);
  animation: fadeInUp 0.6s ease-out;
}

.feature-item:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-sm);
}

.feature-item h3 {
  color: var(--color-primary);
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.feature-item p {
  color: var(--color-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ========== FORMAT CARDS ========== */
.formats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.format-card {
  background: var(--color-soft);
  padding: 1.5rem;
  border-radius: 8px;
  text-align: center;
  font-weight: 600;
  color: var(--color-primary);
  border: 2px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  animation: scaleIn 0.3s ease-out;
}

.format-card:hover {
  border-color: var(--color-accent);
  background: var(--color-bg);
  transform: scale(1.05);
  box-shadow: var(--shadow-sm);
}

/* ========== APPLICATIONS/PILLS ========== */
.app-grid {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-top: 2rem;
}

.app-pill {
  display: inline-block;
  background: var(--color-soft);
  padding: 0.75rem 1.5rem;
  border-radius: 20px;
  border: 1px solid var(--color-border);
  color: var(--color-primary);
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition);
  animation: scaleIn 0.3s ease-out;
}

.app-pill:hover {
  background: var(--color-accent);
  color: var(--color-bg);
  border-color: var(--color-accent);
  transform: scale(1.05);
}

/* ========== FOOTER ========== */
.footer {
  background: var(--color-primary);
  color: var(--color-bg);
  padding: 3rem 1.5rem 1rem;
  margin-top: 4rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
  max-width: var(--max-w);
  margin-left: auto;
  margin-right: auto;
}

.footer-col h3,
.footer-col h4 {
  color: var(--color-bg);
  font-size: 1rem;
  margin-bottom: 1rem;
}

.footer-col p {
  font-size: 0.9rem;
  line-height: 1.6;
  opacity: 0.9;
  margin-bottom: 0.5rem;
}

.footer-col ul {
  list-style: none;
  padding: 0;
}

.footer-col ul li {
  margin-bottom: 0.75rem;
}

.footer-col a {
  color: var(--color-bg);
  text-decoration: none;
  font-size: 0.9rem;
  opacity: 0.9;
  transition: opacity var(--transition);
}

.footer-col a:hover {
  opacity: 1;
  text-decoration: underline;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 1rem;
  text-align: center;
  font-size: 0.85rem;
  opacity: 0.8;
  max-width: var(--max-w);
  margin: 0 auto;
}

/* ========== TYPOGRAPHY ========== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

h1 {
  font-size: clamp(2rem, 4vw, 3rem);
}

h2 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
}

h3 {
  font-size: clamp(1rem, 2vw, 1.4rem);
}

p {
  line-height: 1.6;
  margin-bottom: 1rem;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}

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

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

/* ========== FORMS ========== */
.contact-form {
  max-width: 600px;
  margin: 0 auto;
  background: var(--color-soft);
  padding: 2.5rem;
  border-radius: 12px;
  animation: fadeInUp 0.6s ease-out;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--color-text);
  transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(195, 40, 50, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 1024px) {
  .value-grid,
  .clinical-grid,
  .process-steps,
  .feature-grid,
  .formats-grid,
  .ingredient-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .hero-ctas {
    flex-direction: column;
  }

  .contact-form {
    padding: 1.5rem;
  }

  .app-grid {
    gap: 1rem;
  }

  .app-pill {
    padding: 0.6rem 1.2rem;
    font-size: 0.9rem;
  }
}

@media (max-width: 480px) {
  .filter-tabs {
    gap: 0.5rem;
  }

  .filter-tab {
    padding: 0.6rem 1rem;
    font-size: 0.85rem;
  }

  .ingredient-grid {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 1rem;
  }
}

/* ========== UTILITY ========== */
.text-center {
  text-align: center;
}

.text-muted {
  color: var(--color-muted);
}

.mt-2 {
  margin-top: 2rem;
}

.mb-2 {
  margin-bottom: 2rem;
}

.section {
  padding: 4rem 1.5rem;
}

.section.alt-bg {
  background: var(--color-soft);
}

/* ===== FINAL DEPLOYMENT IMAGE FIX ===== */
.hero-image {
  display: block;
  width: 100%;
  min-height: 500px;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  object-position: center;
  background: #eef2f7;
}
.logo-img {
  display: block;
  width: auto;
  height: 46px;
  max-width: 52px;
  object-fit: contain;
}
@media (max-width: 768px) {
  .hero-image { min-height: 300px; aspect-ratio: 16 / 10; }
}