/* ==========================================
   MODERN LUXURY STONE WEBSITE
   Metropol Granite Marble Limited
   ========================================== */

/* CSS Variables */
:root {
  /* Colors - Elegant neutral palette with gold accents */
  --color-primary: #B8935F;
  --color-primary-dark: #9A7A4A;
  --color-primary-light: #D4B88D;

  --color-dark: #1A1A1A;
  --color-dark-2: #2A2A2A;
  --color-gray: #5A5A5A;
  --color-gray-light: #8A8A8A;
  --color-light: #F5F5F5;
  --color-white: #FFFFFF;

  --color-overlay: rgba(26, 26, 26, 0.7);

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

  /* Spacing */
  --section-padding: clamp(4rem, 8vw, 8rem);
  --container-padding: clamp(1.5rem, 5vw, 3rem);

  /* Transitions */
  --transition-smooth: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: all 0.2s ease;

  /* Effects */
  --shadow-soft: 0 10px 40px rgba(0, 0, 0, 0.1);
  --shadow-medium: 0 20px 60px rgba(0, 0, 0, 0.15);
  --shadow-strong: 0 30px 80px rgba(0, 0, 0, 0.25);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.7;
  color: var(--color-gray);
  background: var(--color-white);
  overflow-x: hidden;
}

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

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

button {
  border: none;
  background: none;
  cursor: pointer;
  font-family: inherit;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-dark);
}

/* Container */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.container-fluid {
  max-width: 100%;
  padding: 0 var(--container-padding);
}

/* Section Styles */
.section {
  padding: var(--section-padding) 0;
}

.section-label {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.section-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 600;
  margin-bottom: 1.5rem;
  line-height: 1.1;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--color-gray-light);
  max-width: 600px;
  margin: 0 auto;
}

.section-text {
  font-size: 1.0625rem;
  line-height: 1.8;
  margin-bottom: 1.5rem;
  color: var(--color-gray);
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

/* ==========================================
   NAVIGATION
   ========================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: transparent;
  transition: var(--transition-smooth);
  padding: 1.5rem 0;
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(10px);
  box-shadow: 0 5px 30px rgba(0, 0, 0, 0.08);
  padding: 1rem 0;
}

.navbar__container {
  max-width: 1600px;
  margin: 0 auto;
  padding: 0 var(--container-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.brand-logo__icon {
  font-size: 2rem;
  color: var(--color-primary);
  font-weight: 300;
}

.brand-logo__text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-dark);
  letter-spacing: 0.05em;
}

.navbar.scrolled .brand-name {
  color: var(--color-dark);
}

.brand-tagline {
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--color-gray-light);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.navbar__menu {
  display: flex;
  align-items: center;
  gap: 3rem;
  list-style: none;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-dark);
  position: relative;
  padding: 0.5rem 0;
  transition: var(--transition-fast);
}

.navbar:not(.scrolled) .nav-link {
  color: var(--color-white);
}

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

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.navbar__toggle {
  display: none;
  flex-direction: column;
  gap: 0.4rem;
  padding: 0.5rem;
}

.navbar__toggle span {
  display: block;
  width: 28px;
  height: 2px;
  background: var(--color-dark);
  transition: var(--transition-fast);
}

.navbar:not(.scrolled) .navbar__toggle span {
  background: var(--color-white);
}

/* ==========================================
   HERO SECTION
   ========================================== */
.hero {
  position: relative;
  height: 100vh;
  min-height: 700px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero__background {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #2A2A2A 0%, #1A1A1A 100%),
              url('https://images.unsplash.com/photo-1615971677499-5467cbab01c0?q=80&w=2000') center/cover;
  background-blend-mode: overlay;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(26, 26, 26, 0.4), rgba(26, 26, 26, 0.7));
}

.hero__content {
  position: relative;
  z-index: 10;
  color: var(--color-white);
  text-align: center;
  padding: 2rem 0;
}

.hero__subtitle {
  display: inline-block;
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-primary-light);
  margin-bottom: 1.5rem;
}

.hero__title {
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 600;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  color: var(--color-white);
}

.hero__description {
  font-size: clamp(1.125rem, 2vw, 1.375rem);
  line-height: 1.6;
  max-width: 700px;
  margin: 0 auto 3rem;
  color: rgba(255, 255, 255, 0.9);
}

.hero__buttons {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  flex-wrap: wrap;
}

.hero__scroll {
  position: absolute;
  bottom: 3rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-white);
  font-size: 0.875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  opacity: 0.7;
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--color-white), transparent);
  animation: scrollAnimation 2s infinite;
}

@keyframes scrollAnimation {
  0%, 100% { opacity: 0; transform: translateY(0); }
  50% { opacity: 1; transform: translateY(10px); }
}

/* ==========================================
   BUTTONS
   ========================================== */
.btn {
  display: inline-block;
  padding: 1rem 2.5rem;
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-radius: 2px;
  transition: var(--transition-smooth);
  cursor: pointer;
  border: 2px solid transparent;
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

.btn--primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(184, 147, 95, 0.3);
}

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

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

.btn--full {
  width: 100%;
}

/* ==========================================
   ABOUT SECTION
   ========================================== */
.about {
  background: var(--color-white);
}

.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: center;
}

.about__image {
  position: relative;
}

.about__image-wrapper {
  position: relative;
  border-radius: 4px;
  overflow: hidden;
  box-shadow: var(--shadow-medium);
}

.about__image-wrapper img {
  width: 100%;
  height: 600px;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.about__image-wrapper:hover img {
  transform: scale(1.05);
}

.about__stat {
  position: absolute;
  bottom: -30px;
  right: -30px;
  background: var(--color-primary);
  color: var(--color-white);
  padding: 2rem 2.5rem;
  border-radius: 4px;
  text-align: center;
  box-shadow: var(--shadow-strong);
}

.stat-number {
  display: block;
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 700;
  line-height: 1;
  margin-bottom: 0.5rem;
}

.stat-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  opacity: 0.9;
}

.about__features {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-top: 2.5rem;
}

.feature-item {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
}

.feature-icon {
  flex-shrink: 0;
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: 50%;
  font-size: 1.5rem;
  font-weight: 700;
}

.feature-text h4 {
  font-size: 1.125rem;
  margin-bottom: 0.5rem;
}

.feature-text p {
  font-size: 0.9375rem;
  color: var(--color-gray-light);
  margin: 0;
}

/* ==========================================
   PRODUCTS SECTION
   ========================================== */
.products {
  background: var(--color-light);
}

.product-filters {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 0.75rem 2rem;
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  background: var(--color-white);
  color: var(--color-gray);
  border: 1px solid #E0E0E0;
  border-radius: 2px;
  transition: var(--transition-fast);
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(184, 147, 95, 0.3);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 2rem;
}

.product-card {
  background: var(--color-white);
  border-radius: 4px;
  overflow: hidden;
  box-shadow: var(--shadow-soft);
  transition: var(--transition-smooth);
  cursor: pointer;
}

.product-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-medium);
}

.product-card__image {
  position: relative;
  width: 100%;
  height: 350px;
  overflow: hidden;
  background: var(--color-light);
}

.product-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.product-card:hover .product-card__image img {
  transform: scale(1.1);
}

.product-card__badge {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  padding: 0.5rem 1rem;
  background: var(--color-primary);
  color: var(--color-white);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-radius: 2px;
}

.product-card__content {
  padding: 2rem;
}

.product-card__category {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
}

.product-card__title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--color-dark);
}

.product-card__description {
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--color-gray-light);
  margin-bottom: 1rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.product-card__dimensions {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-gray);
  padding: 0.75rem 1rem;
  background: var(--color-light);
  border-radius: 2px;
  margin-top: 1rem;
}

/* ==========================================
   GALLERY SECTION
   ========================================== */
.gallery-section {
  background: var(--color-white);
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-top: 3rem;
}

.gallery-item {
  position: relative;
  border-radius: 4px;
  overflow: hidden;
  aspect-ratio: 4/3;
  cursor: pointer;
}

.gallery-item--large {
  grid-column: span 2;
}

.gallery-item--wide {
  grid-column: span 2;
  aspect-ratio: 16/9;
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.gallery-item:hover img {
  transform: scale(1.1);
}

.gallery-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(26, 26, 26, 0.8), transparent);
  display: flex;
  align-items: flex-end;
  padding: 2rem;
  opacity: 0;
  transition: opacity 0.4s ease;
}

.gallery-item:hover .gallery-overlay {
  opacity: 1;
}

.gallery-title {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-white);
}

/* ==========================================
   CONTACT SECTION
   ========================================== */
.contact-section {
  background: var(--color-light);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: start;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  margin-top: 3rem;
}

.contact-item {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
}

.contact-icon {
  flex-shrink: 0;
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: 50%;
  font-size: 1.25rem;
}

.contact-text h4 {
  font-size: 1.125rem;
  margin-bottom: 0.5rem;
}

.contact-text p {
  font-size: 0.9375rem;
  color: var(--color-gray-light);
  line-height: 1.6;
  margin: 0;
}

.contact-text a {
  color: var(--color-primary);
  transition: var(--transition-fast);
}

.contact-text a:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

.contact-form-wrapper {
  background: var(--color-white);
  padding: 3rem;
  border-radius: 4px;
  box-shadow: var(--shadow-soft);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.form-group {
  display: flex;
  flex-direction: column;
}

.form-group input,
.form-group select,
.form-group textarea {
  padding: 1rem 1.25rem;
  font-size: 0.9375rem;
  font-family: var(--font-body);
  color: var(--color-dark);
  background: var(--color-light);
  border: 1px solid #E0E0E0;
  border-radius: 2px;
  transition: var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  background: var(--color-white);
}

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

/* ==========================================
   FOOTER
   ========================================== */
.footer {
  background: var(--color-dark);
  color: rgba(255, 255, 255, 0.8);
  padding: 4rem 0 2rem;
}

.footer__content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 4rem;
  margin-bottom: 3rem;
}

.footer__brand .brand-name,
.footer__brand .brand-tagline {
  color: var(--color-white);
}

.footer__text {
  margin-top: 1rem;
  font-size: 0.9375rem;
  line-height: 1.6;
  max-width: 400px;
}

.footer h4 {
  font-size: 1.125rem;
  color: var(--color-white);
  margin-bottom: 1.5rem;
}

.footer__links ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer__links a {
  font-size: 0.9375rem;
  transition: var(--transition-fast);
}

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

.footer__contact p {
  font-size: 0.9375rem;
  line-height: 1.8;
  margin-bottom: 0.5rem;
}

.footer__bottom {
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  font-size: 0.875rem;
}

/* ==========================================
   MODAL
   ========================================== */
.modal {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.modal.active {
  display: flex;
}

.modal__overlay {
  position: absolute;
  inset: 0;
  background: rgba(26, 26, 26, 0.95);
  backdrop-filter: blur(10px);
}

.modal__container {
  position: relative;
  background: var(--color-white);
  border-radius: 4px;
  max-width: 1200px;
  width: 100%;
  max-height: 90vh;
  overflow: hidden;
  box-shadow: var(--shadow-strong);
  animation: modalFadeIn 0.4s ease;
}

@keyframes modalFadeIn {
  from {
    opacity: 0;
    transform: scale(0.95) translateY(-20px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.modal__close {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-white);
  color: var(--color-dark);
  font-size: 2rem;
  border-radius: 50%;
  z-index: 10;
  transition: var(--transition-fast);
  box-shadow: var(--shadow-soft);
}

.modal__close:hover {
  background: var(--color-primary);
  color: var(--color-white);
  transform: rotate(90deg);
}

.modal__content {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  max-height: 90vh;
  overflow-y: auto;
}

.modal__gallery {
  background: var(--color-light);
  padding: 3rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.modal__main-image {
  width: 100%;
  height: 500px;
  border-radius: 4px;
  overflow: hidden;
  background: var(--color-white);
}

.modal__main-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.modal__thumbnails {
  display: flex;
  gap: 1rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
}

.modal__thumbnail {
  flex-shrink: 0;
  width: 100px;
  height: 100px;
  border-radius: 4px;
  overflow: hidden;
  cursor: pointer;
  border: 3px solid transparent;
  transition: var(--transition-fast);
}

.modal__thumbnail:hover {
  border-color: var(--color-primary);
  transform: scale(1.05);
}

.modal__thumbnail.active {
  border-color: var(--color-primary);
}

.modal__thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.modal__details {
  padding: 3rem;
  display: flex;
  flex-direction: column;
}

.modal__category {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.modal__title {
  font-size: 2.5rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  line-height: 1.2;
}

.modal__dimensions {
  padding: 1rem 1.5rem;
  background: var(--color-light);
  border-left: 4px solid var(--color-primary);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-gray);
  margin-bottom: 2rem;
}

.modal__description {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--color-gray);
  margin-bottom: 2rem;
  flex-grow: 1;
}

.modal__actions {
  padding-top: 2rem;
  border-top: 1px solid #E0E0E0;
}

/* ==========================================
   RESPONSIVE DESIGN
   ========================================== */

@media (max-width: 1024px) {
  .navbar__menu {
    gap: 2rem;
  }

  .about__grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .about__image-wrapper img {
    height: 500px;
  }

  .about__stat {
    bottom: 20px;
    right: 20px;
  }

  .product-grid {
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  }

  .modal__content {
    grid-template-columns: 1fr;
  }

  .modal__main-image {
    height: 400px;
  }

  .gallery-item--large,
  .gallery-item--wide {
    grid-column: span 1;
  }

  .footer__content {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .navbar__menu {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-white);
    padding: 2rem;
    gap: 1.5rem;
    box-shadow: var(--shadow-medium);
    transform: translateY(-150%);
    transition: transform 0.4s ease;
  }

  .navbar__menu.active {
    transform: translateY(0);
  }

  .navbar__toggle {
    display: flex;
  }

  .navbar__toggle.active span:nth-child(1) {
    transform: rotate(45deg) translateY(10px);
  }

  .navbar__toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .navbar__toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translateY(-10px);
  }

  .hero {
    min-height: 600px;
  }

  .hero__title {
    font-size: clamp(2.5rem, 10vw, 4rem);
  }

  .section-title {
    font-size: clamp(2rem, 8vw, 3rem);
  }

  .product-grid {
    grid-template-columns: 1fr;
  }

  .product-card__image {
    height: 280px;
  }

  .gallery-grid {
    grid-template-columns: 1fr;
  }

  .modal__gallery,
  .modal__details {
    padding: 2rem;
  }

  .modal__main-image {
    height: 300px;
  }

  .modal__title {
    font-size: 2rem;
  }

  .footer__content {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .contact-form-wrapper {
    padding: 2rem;
  }
}

@media (max-width: 480px) {
  :root {
    --container-padding: 1rem;
    --section-padding: 3rem;
  }

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

  .btn {
    width: 100%;
    text-align: center;
  }

  .product-filters {
    gap: 0.75rem;
  }

  .filter-btn {
    font-size: 0.8125rem;
    padding: 0.625rem 1.5rem;
  }

  .modal__gallery,
  .modal__details {
    padding: 1.5rem;
  }

  .modal__close {
    top: 1rem;
    right: 1rem;
    width: 40px;
    height: 40px;
  }
}

/* Smooth scroll */
html {
  scroll-padding-top: 100px;
}