html{
  scroll-behavior: smooth;
}

:root{
  --ink: #12213D;
  --navy: #1B2A4A;
  --navy-soft: #33456B;
  --slate: #5B6B85;
  --slate-light: #98A2B3;
  --hairline: #D6DBE3;
  --paper: #F6F7F9;
  --white: #FFFFFF;
}

*{
  box-sizing: border-box;
}

body{
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: 'Inter', sans-serif;
  -webkit-font-smoothing: antialiased;
}

/* ---- Header ---- */
.site-header{
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 28px 64px;
  border-bottom: 1px solid var(--hairline);
}

.lockup{
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.lockup .word-1{
  font-family: 'Source Serif 4', serif;
  font-size: 24px;
  font-weight: 500;
  color: var(--navy);
  letter-spacing: -0.01em;
  line-height: 1;
}

.lockup .word-2{
  font-family: 'Inter', sans-serif;
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.28em;
  color: var(--slate);
}

.nav{
  display: flex;
  gap: 32px;
}

.nav a{
  font-size: 14px;
  color: var(--slate);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* ---- Hero ---- */
.hero{
  max-width: 720px;
  margin: 0 auto;
  padding: 120px 32px 100px;
  text-align: center;
}

.hero h1{
  font-family: 'Source Serif 4', serif;
  font-weight: 500;
  font-size: 44px;
  line-height: 1.25;
  color: var(--navy);
  margin: 0 0 24px;
}

.hero-sub{
  font-size: 17px;
  color: var(--slate);
  line-height: 1.6;
  max-width: 520px;
  margin: 0 auto 36px;
}

.btn-primary{
  display: inline-block;
  background: var(--navy);
  color: var(--white);
  text-decoration: none;
  padding: 14px 32px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  transition: background 0.2s ease;
}

.btn-primary:hover{
  background: var(--navy-soft);
}

/* ---- About ---- */
.about{
  max-width: 960px;
  margin: 0 auto;
  padding: 80px 32px;
  border-top: 1px solid var(--hairline);
}

.about-grid{
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 64px;
}

.about h2{
  font-family: 'Source Serif 4', serif;
  font-weight: 500;
  font-size: 28px;
  line-height: 1.35;
  color: var(--navy);
  margin: 16px 0 0;
}

.about-points{
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.about-point h4{
  font-size: 14px;
  font-weight: 600;
  color: var(--navy);
  margin: 0 0 6px;
}

.about-point p{
  font-size: 14px;
  line-height: 1.6;
  color: var(--slate);
  margin: 0;
}

/* ---- Services ---- */
.services{
  max-width: 960px;
  margin: 0 auto;
  padding: 80px 32px;
  border-top: 1px solid var(--hairline);
}

.section-label{
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--slate-light);
  margin-bottom: 40px;
  text-align: center;
}

.services-grid{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}

.service-card{
  background: var(--white);
  padding: 40px 32px;
  transition: transform 0.2s ease;
}

.service-card:hover{
  transform: translateY(-2px);
}

.service-card.featured{
  background: var(--navy);
}

.service-card h3{
  font-family: 'Source Serif 4', serif;
  font-size: 21px;
  font-weight: 500;
  color: var(--navy);
  margin: 0 0 14px;
}

.service-card.featured h3{
  color: var(--white);
}

.service-card p{
  font-size: 14px;
  line-height: 1.6;
  color: var(--slate);
  margin: 0;
}

.service-card.featured p{
  color: #C9D2E1;
}

/* ---- Portfolio ---- */
.portfolio{
  max-width: 960px;
  margin: 0 auto;
  padding: 80px 32px;
  border-top: 1px solid var(--hairline);
}

.portfolio-grid{
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.portfolio-card h4{
  font-family: 'Source Serif 4', serif;
  font-size: 17px;
  font-weight: 500;
  color: var(--navy);
  margin: 0 0 4px;
}

.portfolio-card p{
  font-size: 13px;
  color: var(--slate-light);
  margin: 0;
}

.portfolio-placeholder{
  height: 200px;
  background: var(--paper);
  border: 1px dashed var(--hairline);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--slate-light);
  margin-bottom: 16px;
  transition: border-color 0.2s ease;
}

.portfolio-card:hover .portfolio-placeholder{
  border-color: var(--slate-light);
}

.portfolio-image{
  width: 100%;
  height: 200px;
  object-fit: cover;
  object-position: top;
  border: 1px solid var(--hairline);
  margin-bottom: 16px;
  display: block;
}

/* ---- Contact ---- */
.contact{
  max-width: 600px;
  margin: 0 auto;
  padding: 100px 32px;
  text-align: center;
  border-top: 1px solid var(--hairline);
}

.contact h2{
  font-family: 'Source Serif 4', serif;
  font-weight: 500;
  font-size: 32px;
  color: var(--navy);
  margin: 0 0 16px;
}

.contact p{
  font-size: 15px;
  color: var(--slate);
  margin: 0 0 32px;
}

/* ---- Footer ---- */
.site-footer{
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 32px 64px;
  border-top: 1px solid var(--hairline);
}

.site-footer .lockup .word-1{
  font-size: 16px;
}

.site-footer .lockup .word-2{
  font-size: 8px;
}

.site-footer p{
  font-size: 12px;
  color: var(--slate-light);
  margin: 0;
}

/* ---- Responsive ---- */
@media (max-width: 768px){

  .site-header{
    flex-direction: column;
    gap: 16px;
    padding: 24px 24px;
  }

  .nav{
    gap: 20px;
  }

  .hero{
    padding: 72px 24px 64px;
  }

  .hero h1{
    font-size: 30px;
  }

  .hero-sub{
    font-size: 15px;
  }

  .about-grid{
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .about h2{
    font-size: 23px;
  }

  .services{
    padding: 56px 24px;
  }

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

  .portfolio{
    padding: 56px 24px;
  }

  .portfolio-grid{
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .contact{
    padding: 64px 24px;
  }

  .contact h2{
    font-size: 26px;
  }

  .site-footer{
    flex-direction: column;
    gap: 12px;
    padding: 28px 24px;
    text-align: center;
  }
}
/* ---- Lightbox ---- */
.portfolio-image{
  cursor: pointer;
}

.lightbox{
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(18, 33, 61, 0.92);
  z-index: 999;
  align-items: center;
  justify-content: center;
  padding: 40px;
}

.lightbox.active{
  display: flex;
}

.lightbox-img{
  max-width: 90%;
  max-height: 90%;
  border: 1px solid var(--hairline);
}

.lightbox-close{
  position: absolute;
  top: 28px;
  right: 40px;
  color: var(--white);
  font-size: 34px;
  line-height: 1;
  cursor: pointer;
}