:root {
  --black: black;
  --white: white;
  --light-gray: #d3d3d3;
  --dark-gray: #545454;
  --border-color: #bebebe;
  --font-serif: Georgia, 'Times New Roman', serif;
  --font-sans: Helvetica, Arial, sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--black);
  background: var(--white);
  margin: 0;
  padding: 0;
  font-size: 16px;
  line-height: 1.7;
}

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
}

nav {
  background: var(--white);
  border-bottom: 1px solid var(--border-color);
  padding: 20px 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;

  & .nav-logo {
    font-size: 20px;
    font-weight: bold;
    text-decoration: none;
    color: var(--black);
  }

  & .nav-links {
    list-style: none;
    display: flex;
    gap: 32px;

    & a {
      text-decoration: none;
      color: var(--dark-gray);
      font-size: 14px;

      &:hover {
        color: var(--black);
      }

      &.current {
        color: var(--black);
        font-weight: bold;
      }
    }
  }
}

.button {
  display: inline-block;
  background: var(--black);
  color: var(--white);
  padding: 12px 28px;
  text-decoration: none;
  font-size: 14px;
  border: 2px solid var(--black);

  &:hover {
    background: var(--white);
    color: var(--black);
  }
}

.button-outline {
  display: inline-block;
  background: var(--white);
  color: var(--black);
  padding: 12px 28px;
  text-decoration: none;
  font-size: 14px;
  border: 2px solid var(--black);

  &:hover {
    background: var(--black);
    color: var(--white);
  }
}

.divider {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 0;
}

.section-label {
  font-size: 12px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--dark-gray);
  margin-bottom: 12px;
}

.page-header {
  padding: 80px 40px 60px;
  border-bottom: 1px solid var(--border-color);

  & h1 {
    font-size: 56px;
    margin-bottom: 16px;
    max-width: 600px;
  }

  & p {
    font-size: 17px;
    color: var(--dark-gray);
    max-width: 480px;
  }
}

.intro {
  padding: 100px 40px;
  border-bottom: 1px solid var(--border-color);

  & h1 {
    font-size: 64px;
    line-height: 1.1;
    margin-bottom: 24px;
    max-width: 700px;
  }

  & p {
    font-size: 18px;
    color: var(--dark-gray);
    max-width: 500px;
    margin-bottom: 40px;
  }

  & .intro-buttons {
    display: flex;
    gap: 16px;
  }
}


.selected-work {
  padding: 80px 40px;
  border-bottom: 1px solid var(--border-color);

  & h2 {
    font-size: 36px;
    margin-bottom: 48px;
  }

  & .cards {
    display: flex;
    gap: 32px;
  }
}

.card {
  flex: 1;
  border: 1px solid var(--border-color);
  padding: 32px;

  & .card-image {
    background: var(--light-gray);
    height: 180px;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--dark-gray);
    font-size: 13px;
    overflow: hidden;

    & img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      object-position: center;
      display: block;
    }
  }

  & h3 {
    font-size: 22px;
    margin-bottom: 10px;
  }

  & p {
    color: var(--dark-gray);
    font-size: 15px;
    margin-bottom: 20px;
  }

  & a {
    color: var(--black);
    font-size: 14px;
  }
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  padding: 60px 40px;
  border-bottom: 1px solid var(--border-color);
}

.project-card {
  border: 1px solid var(--border-color);
  text-decoration: none;
  color: var(--black);
  display: block;

  &:hover {
    border-color: var(--black);
  }

  & .project-card-image {
    background: var(--light-gray);
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--dark-gray);
    font-size: 13px;
    overflow: hidden;

    & img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      object-position: center;
      display: block;
    }
  }

  & .project-card-body {
    padding: 24px;

    & h3 {
      font-size: 20px;
      margin: 8px 0;
    }

    & p {
      color: var(--dark-gray);
      font-size: 14px;
      margin: 0;
    }
  }
}

.about-grid {
  display: flex;
  gap: 80px;
  padding: 80px 40px;
  border-bottom: 1px solid var(--border-color);
  align-items: flex-start;

  & .about-photo {
    width: 320px;
    flex-shrink: 0;
    background: var(--light-gray);
    aspect-ratio: 3 / 4;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--dark-gray);
    font-size: 13px;
    border: 1px solid var(--border-color);
    overflow: hidden;

    & img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      object-position: center top;
      display: block;
    }
  }

  & .about-text {
    & h2 {
      font-size: 36px;
      margin-bottom: 24px;
    }

    & p {
      color: var(--dark-gray);
      margin-bottom: 18px;
    }

    & .about-buttons {
      display: flex;
      gap: 16px;
      margin-top: 32px;
    }
  }
}

.skills {
  padding: 60px 40px;
  border-bottom: 1px solid var(--border-color);

  & h2 {
    font-size: 32px;
    margin-bottom: 40px;
  }

  & .skills-grid {
    display: flex;
    gap: 0;
  }
}

.skill-column {
  flex: 1;
  padding-right: 40px;
  border-right: 1px solid var(--border-color);
  margin-right: 40px;

  &:last-child {
    border-right: none;
    margin-right: 0;
  }

  & h4 {
    font-size: 13px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--dark-gray);
    margin-bottom: 16px;
  }

  & ul {
    list-style: none;

    & li {
      font-size: 15px;
      padding: 6px 0;
    }
  }
}

.interests {
  padding: 60px 40px;
  border-bottom: 1px solid var(--border-color);

  & h2 {
    font-size: 32px;
    margin-bottom: 40px;
  }

  & .interests-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
}

.interest-card {
  background: var(--light-gray);
  padding: 28px;

  & .interest-icon {
    font-size: 28px;
    margin-bottom: 12px;
  }

  & h4 {
    font-size: 18px;
    margin-bottom: 10px;
  }

  & p {
    font-size: 14px;
    color: var(--dark-gray);
    margin: 0;
  }
}

.resume-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  align-items: flex-start;
  max-width: 960px;
  margin: 0 auto;
  padding: 60px 40px;
  gap: 60px;
}

.resume-section {
  margin-bottom: 48px;

  & h3 {
    font-size: 11px;
    font-family: var(--font-sans);
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--dark-gray);
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
  }

  & p,
  & li {
    font-size: 15px;
    color: var(--dark-gray);
    margin-bottom: 8px;
  }

  & ul {
    padding-left: 20px;
  }
}

.job {
  margin-bottom: 36px;
  padding-bottom: 36px;
  border-bottom: 1px solid var(--light-gray);

  &:last-child {
    border-bottom: none;
  }

  & .job-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
  }

  & h4 {
    font-size: 20px;
    margin-bottom: 4px;
  }

  & .job-company {
    color: var(--dark-gray);
    font-size: 14px;
  }

  & .job-date {
    font-size: 13px;
    color: var(--dark-gray);
    white-space: nowrap;
  }

  & ul {
    padding-left: 20px;

    & li {
      font-size: 15px;
      color: var(--dark-gray);
      margin-bottom: 6px;
    }
  }
}

footer {
  padding: 32px 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border-color);

  & p {
    font-size: 13px;
    color: var(--dark-gray);
  }

  & .footer-links {
    display: flex;
    gap: 24px;

    & a {
      font-size: 13px;
      color: var(--dark-gray);
      text-decoration: none;

      &:hover {
        color: var(--black);
      }
    }
  }
}

.download-link {
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--black);
  text-decoration: none;
  border-bottom: 1px solid var(--black);
  padding-bottom: 1px;

  &:hover { opacity: 0.55; }
}

.project-section {
  padding: 80px 40px 60px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  gap: 80px;
  align-items: flex-start;
}

.project-text {
  flex: 1;

  & .section-label { margin-bottom: 12px; }

  & h1 {
    font-size: 52px;
    line-height: 1.1;
    margin-bottom: 20px;
  }

  & .project-summary {
    font-size: 17px;
    color: var(--dark-gray);
    max-width: 480px;
    margin-bottom: 32px;
  }

  & .project- {
    display: flex;
    gap: 40px;
  }
}

.project-date {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-family: var(--font-sans);
  color: var(--dark-gray);
  letter-spacing: 0.05em;
  margin-bottom: 20px;

  &::before {
    content: '';
    display: inline-block;
    width: 16px;
    height: 1px;
    background: var(--dark-gray);
    vertical-align: middle;
  }
}

.projectd-image {
  width: 380px;
  flex-shrink: 0;
  background: var(--light-gray);
  border: 1px solid var(--border-color);
  overflow: hidden;
  aspect-ratio: 4 / 3;

  & img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
  }
}

.project-summary {
  padding: 60px 40px;
  display: flex;
  gap: 80px;
  align-items: flex-start;
  max-width: 900px;
  margin: 0 auto;
}

.project-overview {
  max-width: 520px;

  & p {
    font-size: 16px;
    color: var(--dark-gray);
    margin-bottom: 16px;
    line-height: 1.75;

    &:last-child { margin-bottom: 0; }
  }
}

.project-summary-label {
  width: 160px;
  flex-shrink: 0;

  & h2 {
    font-size: 13px;
    font-family: var(--font-sans);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--dark-gray);
  }
}

.project-summary-body {
  flex: 1;
  max-width: 620px;

  & p {
    font-size: 16px;
    color: var(--dark-gray);
    margin-bottom: 16px;
    line-height: 1.75;

    &:last-child { margin-bottom: 0; }
  }
}

.project-details {
  padding: 60px 40px;
  border-bottom: 1px solid var(--border-color);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
}

.project-detail-block {
  padding-right: 40px;
  border-right: 1px solid var(--border-color);
  margin-right: 40px;

  &:last-child {
    border-right: none;
    margin-right: 0;
    padding-right: 0;
  }

  & h3 {
    font-size: 11px;
    font-family: var(--font-sans);
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--dark-gray);
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
  }

  & ul {
    list-style: none;
    padding: 0;

    & li {
      font-size: 14px;
      color: var(--dark-gray);
      padding: 5px 0;
      border-bottom: 1px solid var(--light-gray);

      &:last-child { border-bottom: none; }
    }
  }
}

.project-full-image {
  border-bottom: 1px solid var(--border-color);
  padding: 60px 40px;
  display: flex;
  justify-content: center;

  & img {
    width: 100%;
    max-width: 960px;
    height: auto;
    display: block;
  }
}

.project-nav {
  display: flex;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.project-nav-link {
  flex: 1;
  padding: 28px 40px;
  text-decoration: none;
  color: var(--black);
  font-size: 14px;
  font-family: var(--font-sans);
  border-right: 1px solid var(--border-color);

  &:last-child {
    border-right: none;
    text-align: right;
  }

  &:hover { background: var(--light-gray); }
}

@media (max-width: 1000px) {

  nav {
    padding: 16px 24px;

    & .nav-links {
      gap: 20px;
    }
  }

  .page-header {
    padding: 60px 24px 48px;

    & h1 {
      font-size: 44px;
    }
  }

  .intro {
    padding: 80px 24px;

    & h1 {
      font-size: 52px;
    }
  }

  .selected-work {
    padding: 60px 24px;

    & .cards {
      flex-wrap: wrap;
      gap: 24px;
    }
  }

  .card {
    flex: 1 1 calc(50% - 12px);
    min-width: 240px;
  }

  .project-grid {
    grid-template-columns: repeat(2, 1fr);
    padding: 48px 24px;
    gap: 24px;
  }

  .about-grid {
    gap: 48px;
    padding: 60px 24px;

    & .about-photo {
      width: 260px;
    }

    & .about-text h2 {
      font-size: 28px;
    }
  }
  .skills {
    padding: 48px 24px;

    & .skills-grid {
      flex-wrap: wrap;
      gap: 0;
    }
  }

  .skill-column {
    flex: 1 1 calc(50% - 20px);
    margin-bottom: 32px;

    &:last-child {
      border-right: none;
    }

    &:nth-child(2) {
      border-right: none;
      padding-right: 0;
      margin-right: 0;
    }
  }

  .interests {
    padding: 48px 24px;

    & .interests-grid {
      grid-template-columns: repeat(2, 1fr);
    }
  }

  .resume-layout {
    padding: 48px 24px;
    gap: 40px;
  }

  .project-section {
    padding: 60px 24px 48px;
    flex-direction: column;
    gap: 40px;

    & .project-text h1 {
      font-size: 36px;
    }
  }
  }

  .project-full-image {
    padding: 40px 24px;
  }

  .project-summary {
    padding: 48px 24px;
    flex-direction: column;
    gap: 24px;
  }

  .project-overview-label {
    width: auto;
  }

  .project-details {
    padding: 48px 24px;
    grid-template-columns: repeat(2, 1fr);
  }

  .project-detail-block:nth-child(2) {
    border-right: none;
    margin-right: 0;
    padding-right: 0;
  }

  .project-nav-link {
    padding: 24px;
  }

  footer {
    padding: 24px;
  }


/* Burger button — hidden by default */
.nav-burger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  flex-direction: column;
  gap: 5px;
}

.nav-burger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--black);
  transition: transform 0.2s, opacity 0.2s;
}

/* Animated X when open */
.nav-burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-burger.open span:nth-child(2) { opacity: 0; }
.nav-burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 768px) {

  nav {
    flex-wrap: wrap;
    padding: 16px 20px;
    position: relative;
    align-items: center;

    & .nav-logo {
      order: 1;
    }

    & .nav-burger {
      order: 2;
      display: flex;
      margin-left: auto;
    }

    & .nav-links {
      order: 3;
      flex-direction: column;
      gap: 0;
      width: 100%;
      overflow: hidden;
      max-height: 0;
      opacity: 0;
      transition: max-height 0.35s ease, opacity 0.35s ease;

      & li {
        border-bottom: 1px solid var(--border-color);

        &:first-child {
          border-top: 1px solid var(--border-color);
          margin-top: 8px;
        }
      }

      & a {
        display: block;
        padding: 14px 0;
        font-size: 15px;
      }
    }

    & .nav-links.open {
      max-height: 300px;
      opacity: 1;
    }
  }

  .page-header {
    padding: 48px 20px 36px;

    & h1 {
      font-size: 36px;
    }

    & p {
      font-size: 15px;
    }
  }

  .intro {
    padding: 60px 20px;

    & h1 {
      font-size: 40px;
    }

    & p {
      font-size: 16px;
    }

    & .intro-buttons {
      flex-direction: column;
      align-items: flex-start;
    }
  }

  .selected-work {
    padding: 48px 20px;

    & .cards {
      flex-direction: column;
      gap: 20px;
    }
  }

  .card {
    flex: 1 1 100%;
  }

  .project-grid {
    grid-template-columns: 1fr;
    padding: 40px 20px;
    gap: 20px;
  }

  .about-grid {
    flex-direction: column;
    padding: 48px 20px;
    gap: 32px;

    & .about-photo {
      width: 100%;
      max-width: 360px;
    }

    & .about-text h2 {
      font-size: 24px;
    }

    & .about-buttons {
      flex-direction: column;
      align-items: flex-start;
    }
  }

  .skills {
    padding: 40px 20px;

    & .skills-grid {
      flex-direction: column;
    }
  }

  .skill-column {
    flex: 1 1 100%;
    border-right: none;
    padding-right: 0;
    margin-right: 0;
    padding-bottom: 24px;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--border-color);

    &:last-child {
      border-bottom: none;
      margin-bottom: 0;
      padding-bottom: 0;
    }

    &:nth-child(2) {
      border-right: none;
      padding-right: 0;
      margin-right: 0;
    }
  }

  .interests {
    padding: 40px 20px;

    & .interests-grid {
      grid-template-columns: 1fr;
    }
  }

  .resume-layout {
    grid-template-columns: 1fr;
    padding: 40px 20px;
    gap: 0;
  }

  .resume-sidebar {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 40px;
    margin-bottom: 40px;
  }

  .project-section {
    padding: 48px 20px 40px;
    flex-direction: column;
    gap: 32px;

    & .project-text h1 {
      font-size: 36px;
    }
  }

  .project-full-image {
    padding: 24px 20px;
  }

  .project-summary {
    padding: 40px 20px;
    flex-direction: column;
    gap: 20px;
  }

  .project-details {
    padding: 40px 20px;
    grid-template-columns: 1fr;
  }

  .project-detail-block {
    border-right: none;
    margin-right: 0;
    padding-right: 0;
    padding-bottom: 24px;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--border-color);

    &:last-child {
      border-bottom: none;
      margin-bottom: 0;
      padding-bottom: 0;
    }
  }

  .project-nav {
    flex-direction: column;
  }

  .project-nav-link {
    padding: 20px;
    border-right: none;
    border-bottom: 1px solid var(--border-color);

    &:last-child {
      border-bottom: none;
      text-align: left;
    }
  }

  footer {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    padding: 24px 20px;
  }
}