@import url('https://fonts.googleapis.com/css2?family=Open+Sans:ital,wght@0,300..800;1,300..800&family=Roboto+Serif:ital,opsz,wght@0,8..144,100..900;1,8..144,100..900&display=swap');

:root {
  
  --c_black: #111;
  --c_blue: #0070bb;
  --c_blue-light: #4a90e2;
  --c_general: #3f3f3f;
  --c_white: #ffffff;
  --c_gray-light: #f5f5f5;
  --c_overlay: rgba(17,17,17,.85);
  
  --f_general: 'Open Sans', sans-serif;
  --f_serif: 'Roboto', serif;
  
  --fs_base: 1rem;
  --fs_nav: 1rem;
  --fs_btn: 1.15rem;
  --fs_h1: 1.75rem;
  --fs_h2: 2rem;
  --fs_h3: 1.5rem;
  --fs_small: 0.875rem;
  
  --fw_normal: 400;
  --fw_medium: 500;
  --fw_semibold: 600;
  --fw_bold: 700;
  
  --space_xs: 0.5rem;
  --space_sm: 1rem;
  --space_md: 1.5rem;
  --space_lg: 2rem;
  --space_xl: 3rem;
  --space_xxl: 4rem;
  
  --container_width: 90%;
  --container_max: 75rem;
  --nav_height: 4rem;
  --hero_logo_width: 20rem;
  
  --cols: 12;
  --gap: 1.25rem;

  --radius_sm: 4px;
  --radius_md: 8px;
}

* {
  box-sizing: border-box;
}

html {
  font-size: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--f_general);
  font-size: var(--fs_base);
  line-height: 1.6;
  color: var(--c_general);
  margin: 0;
  padding: 0;
}


h1, h2, h3, h4, h5, h6 {
  font-family: var(--f_serif);
  font-weight: var(--fw_semibold);
  color: var(--c_blue);
  line-height: 1.3;
  margin-bottom: var(--space_md);
}

h1 { font-size: var(--fs_h1); }
h2 { font-size: var(--fs_h2); }
h3 { font-size: var(--fs_h3); }

p {
  margin-bottom: var(--space_lg);
  line-height: 1.6;
}

a, a:visited {
  color: var(--c_blue);
  text-decoration: none;
  transition: all 0.3s ease;
}

a:hover, a:visited:hover {
  color: var(--c_blue-light);
}

.container {
  width: var(--container_width);
  max-width: var(--container_max);
  margin: 0 auto;
  padding: 0 var(--space_sm);
}

.layout_flex {
  display: flex;
}

.layout_flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.layout_flex-spc-btwn {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.layout_desktop {
  display: none;
}

.layout_responsive {
  display: block;
}

section {
  margin-bottom: var(--space_xxl);
}

.btn, .btn:visited {
  display: inline-block;
  font-family: var(--f_general);
  font-size: var(--fs_btn);
  font-weight: var(--fw_medium);
  color: var(--c_white);
  background-color: var(--c_blue);
  border: 2px solid var(--c_blue);
  padding: var(--space_sm) var(--space_lg);
  border-radius: var(--radius_sm);
  text-align: center;
  transition: all 0.3s ease;
  cursor: pointer;
}

.btn:hover, .btn:visited:hover {
  background-color: transparent;
  color: var(--c_blue);
}

.btn-outline, .btn-outline:visited {
  background-color: transparent;
  color: var(--c_blue);
}

.btn-outline:hover, .btn-outline:visited:hover {
  background-color: var(--c_blue);
  color: var(--c_white);
}

#how .btn, #how .btn:visited {
  background-color: transparent;
  color: var(--c_white);
  border: 2px solid var(--c_white);
  padding: 0.75rem 2.5rem;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

#how .btn:hover, #how .btn:visited:hover {
  background-color: var(--c_blue);
  border-color: var(--c_blue);
  color: var(--c_white);
}


#hero {
  background: linear-gradient(rgba(0,0,0,0.3), rgba(0,0,0,0.3)), url("https://images.unsplash.com/photo-1554224155-6726b3ff858f?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=2070&q=80");
  background-size: cover;
  background-position: center;
  padding: var(--space_xl) 0;
  text-align: center;
}

.hero_logo-wrapper {
  max-width: var(--hero_logo_width);
  margin: 0 auto;
}

.hero_logo-img {
  width: 100%;
  height: auto;
  filter: brightness(1.2);
}

#nav {
  background-color: var(--c_white);
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-utility {
  background-color: var(--c_gray-light);
  padding: var(--space_xs) 0;
  font-size: var(--fs_small);
  text-align: center;
}

.utility_container {
  padding: 0 var(--space_sm);
}

.nav-desk {
  display: none;
}

.nav-desk_logo {
  display: none;
}

.mobile-menu-checkbox {
  display: none;
}

.mobile-nav-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space_xs);
  margin-left: auto;
  display: block;
}

.mobile-nav-toggle img {
  width: 24px;
  height: 24px;
  filter: hue-rotate(220deg) saturate(2);
}

.mobile-nav-menu {
  display: none;
  background-color: var(--c_blue);
  padding: var(--space_xl) 0;
  position: fixed;
  top: 80px; 
  left: 0;
  width: 100vw;
  height: 75vh;
  z-index: 1000;
  overflow-y: auto;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-radius: 0 0 var(--space_md) var(--space_md); 
}


.mobile-menu-checkbox:checked + .nav-mobile + .mobile-nav-menu {
  display: flex;
}

.mobile-nav-menu ul {
  list-style: none;
  margin: 0;
  padding: 0;
  text-align: center;
}

.mobile-nav-menu li {
  margin-bottom: var(--space_xl);
}

.mobile-nav-menu a {
  font-size: 1.5rem;
  font-weight: var(--fw_medium);
  color: var(--c_white);
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: var(--space_md);
  display: block;
  transition: all 0.3s ease;
}

.mobile-nav-menu a:hover {
  background-color: rgba(255,255,255,0.1);
  color: var(--c_white);
}

#how {
  background: linear-gradient(rgba(17,17,17,.85), rgba(17,17,17,.85)), url("https://images.unsplash.com/photo-1460472178825-e5240623afd5?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=2069&q=80");
  background-size: cover;
  background-position: center;
  color: var(--c_white);
  text-align: center;
  padding: var(--space_xxl) 0;
}

#how h1 {
  color: var(--c_white);
  margin-bottom: var(--space_md);
  line-height: 1.2;
}

#how .about_span {
  display: block;
  font-style: italic;
  color: var(--c_blue-light);
  font-size: 1.1em;
  margin-top: var(--space_sm);
}


#welcome {
  padding: var(--space_xxl) 0;
  background-color: var(--c_gray-light);
}

.welcome_img {
  width: 100%;
  height: auto;
  border-radius: var(--radius_md);
  margin-bottom: var(--space_lg);
}

#what {
  padding: var(--space_xxl) 0;
  text-align: center;
}

#what h2 {
  margin-bottom: var(--space_xl);
}

.what-services {
  display: grid;
  gap: var(--space_xl);
  margin-bottom: var(--space_xl);
}

.what_box {
  text-align: center;
  padding: var(--space_lg);
  border-radius: var(--radius_md);
  background-color: var(--c_white);
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.what_box img {
  width: 80px;
  height: 80px;
  margin-bottom: var(--space_md);
}

.what_box h3 {
  margin-bottom: var(--space_sm);
  font-size: 1.25rem;
}

.what_box p {
  font-size: var(--fs_small);
  line-height: 1.5;
  margin-bottom: 0;
}

.guarantee-text {
  font-style: italic;
  color: var(--c_blue);
  font-weight: var(--fw_medium);
  margin-top: var(--space_lg);
}


#history {
  background-color: var(--c_gray-light);
  padding: var(--space_xxl) 0;
  text-align: center;
}

.timeline {
  position: relative;
  max-width: 600px;
  margin: 0 auto;
  padding: var(--space_lg) 0;
}

.timeline-item {
  background-color: var(--c_white);
  padding: var(--space_lg);
  border-radius: var(--radius_md);
  margin-bottom: var(--space_lg);
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.timeline-year {
  color: var(--c_blue);
  font-weight: var(--fw_bold);
  font-size: 1.25rem;
  margin-bottom: var(--space_sm);
}

#cta {
  background: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), url("https://images.unsplash.com/photo-1521791136064-7986c2920216?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=2069&q=80");
  background-size: cover;
  background-position: center;
  color: var(--c_white);
  text-align: center;
  padding: var(--space_xxl) 0;
}

#cta h2 {
  color: var(--c_white);
  margin-bottom: var(--space_sm);
}

.cta-subtitle {
  color: var(--c_blue-light);
  font-size: 1.1rem;
  margin-bottom: var(--space_lg);
}

.cta-note {
  font-style: italic;
  margin-top: var(--space_lg);
  opacity: 0.9;
}


#clients {
  padding: var(--space_xxl) 0;
  text-align: center;
}

.client-categories {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space_md);
  margin-bottom: var(--space_xl);
}

.category-tag {
  border: 2px solid var(--c_blue);
  color: var(--c_blue);
  background-color: transparent;
  padding: var(--space_sm) var(--space_lg);
  border-radius: var(--radius_sm);
  font-size: var(--fs_nav);
  font-weight: var(--fw_medium);
  transition: all 0.3s ease;
  cursor: pointer;
  min-width: 200px;
  text-align: center;
}

.category-tag.active {
  background-color: var(--c_blue);
  color: var(--c_white);
}

.category-tag:hover {
  background-color: var(--c_blue);
  color: var(--c_white);
}

.client-logos {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space_lg);
  margin-bottom: var(--space_xl);
  align-items: center;
}

.client-logo {
  background-color: var(--c_white);
  padding: var(--space_lg);
  border-radius: var(--radius_md);
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100px;
}

.client-logo img {
  max-width: 120px;
  height: auto;
}

.client-tagline {
  font-style: italic;
  color: var(--c_general);
  margin-bottom: var(--space_lg);
}
@media (max-width: 768px) {
  .client-categories {
    flex-direction: column;
    align-items: center;
  }
  
  .category-tag {
    width: 100%;
    max-width: 300px;
  }
}

@media (min-width: 576px) {
  .client-logos {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 768px) {
  .client-logos {
    grid-template-columns: repeat(4, 1fr);
  }
}

footer {
  background-color: var(--c_black);
  color: var(--c_white);
  text-align: center;
  padding: var(--space_lg) 0;
}

@media (min-width: 576px) {
  :root {
    --fs_h1: 2rem;
    --fs_h2: 2.5rem;
    --container_width: 85%;
  }
  
  .client-logos {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .what-services {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 768px) {
  :root {
    --fs_h1: 2.25rem;
    --fs_h2: 2.75rem;
    --hero_logo_width: 25rem;
  }
  
  .what-services {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .client-logos {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 1024px) {
  :root {
    --fs_h1: 2.5rem;
    --fs_h2: 3rem;
    --hero_logo_width: 30rem;
    --container_width: 85%;
  }
  
  .layout_responsive {
    display: none;
  }
  
  .layout_desktop {
    display: block;
  }
  
  .nav-desk {
    display: block;
  }
  
  .nav-desk_logo {
    display: block;
    width: 10rem;
  }
  
  .nav-desk_logo-img {
    width: 100%;
    height: auto;
  }
  
  .nav-desk ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: var(--space_lg);
  }
  
  .nav-desk a {
    font-size: var(--fs_nav);
    font-weight: var(--fw_medium);
    padding: var(--space_sm) var(--space_xs);
  }
  
  #welcome .layout_flex {
    align-items: center;
    gap: var(--space_xl);
  }
  
  .welcome_box.col-5 {
    flex: 0 0 40%;
  }
  
  .welcome_box.col-7 {
    flex: 0 0 55%;
  }
  
  .welcome_img {
    margin-bottom: 0;
  }
}

@media (min-width: 1280px) {
  :root {
    --container_width: 80%;
    --hero_logo_width: 35rem;
  }
  
  .what-services {
    grid-template-columns: repeat(4, 1fr);
  }
}


@media (min-width: 576px) {
  .contact-info {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .contact-info {
    grid-template-columns: repeat(4, 1fr);
  }
}

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--space_sm); }
.mb-md { margin-bottom: var(--space_md); }
.mb-lg { margin-bottom: var(--space_lg); }
.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--space_sm); }
.mt-md { margin-top: var(--space_md); }
.mt-lg { margin-top: var(--space_lg); }