:root {
  --color-black: #000000;
  --color-white: #ffffff;
  --color-gray-100: #f5f5f5;
  --color-gray-200: #e5e5e5;
  --color-gray-300: #d4d4d4;
  --color-gray-600: #525252;
  --color-gray-700: #404040;
  --color-gray-800: #262626;
  --color-gray-900: #171717;

  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --transition-base: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.15);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

@media (min-width: 768px) {
  html {
    scroll-padding-top: 100px;
  }
}

body {
  font-family: var(--font-primary);
  line-height: 1.5;
  color: var(--color-gray-700);
  background: var(--color-gray-100);
  overflow-x: hidden;
  font-size: 0.95rem;
}

.nav-minimal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-gray-200);
}

.nav-content {
  max-width: 1400px;
  margin: 0 auto;
  padding: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-black);
  letter-spacing: -0.02em;
}

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1rem;
  background: var(--color-black);
  color: var(--color-white);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.75rem;
  transition: var(--transition-base);
  border: 2px solid var(--color-black);
}

.btn-download:hover {
  background: var(--color-white);
  color: var(--color-black);
  transform: translateY(-2px);
}

.grid-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 80px 1.5rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.section {
  width: 100%;
}

.section-narrow {
  max-width: 800px;
  margin: 0 auto;
  padding-top: 2rem;
  border-top: 1px solid var(--color-gray-200);
}

main > .section-narrow:first-of-type {
  border-top: none;
  padding-top: 0;
}

.hero-section {
  margin-bottom: 2rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: center;
  min-height: auto;
}

.hero-section .title {
  margin-bottom: 1rem;
}

.hero-section .subtitle {
  max-width: 700px;
}

.hero-image-wrapper {
  position: relative;
}

.hero-image {
  width: 100%;
  height: 300px;
  object-fit: cover;
  filter: grayscale(100%);
  transition: filter 0.6s ease;
}

.hero-image:hover {
  filter: grayscale(0%);
}

.work-permit-notice {
  margin-top: 1.5rem;
  padding: 1rem 1.5rem;
  background: var(--color-gray-100);
  border-left: 3px solid var(--color-black);
  font-weight: 600;
}

.stats-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.section-title {
  margin-bottom: 3rem;
}

.project-item {
  margin-bottom: 3rem;
}

.project-item:last-child {
  margin-bottom: 0;
}

.project-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.project-description {
  margin-bottom: 0.75rem;
  line-height: 1.6;
  font-weight: 600;
}

.project-list {
  line-height: 1.6;
  padding-left: 1.5rem;
  margin-bottom: 1.25rem;
}

.project-images {
  width: 100%;
  max-width: 500px;
  height: 280px;
  margin: 0 auto 1rem;
  position: relative;
  overflow: hidden;
  background: var(--color-gray-100);
}

.slide-container {
  width: 100%;
  height: 100%;
  position: relative;
  display: flex;
  transition: transform 0.6s ease-in-out;
}

.project-images img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  flex-shrink: 0;
  cursor: pointer;
}

.skill-category {
  margin-bottom: 2rem;
}

.skill-category:last-child {
  margin-bottom: 0;
}

.skill-text {
  line-height: 1.6;
  margin-bottom: 0;
}

.experience-item,
.education-item {
  margin-bottom: 2.5rem;
}

.experience-item:last-child,
.education-item:last-child {
  margin-bottom: 0;
}

.job-title,
.education-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.company-name,
.education-program {
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.item-list {
  line-height: 1.6;
  padding-left: 1.5rem;
  margin-bottom: 0;
}

.languages-additional-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.languages-additional-grid .section-title {
  margin-bottom: 1.5rem;
}

.contact-section {
  text-align: center;
}

.contact-title {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 1.5rem;
  line-height: 1.2;
}

.contact-info {
  margin-bottom: 3rem;
}

.contact-email {
  font-size: 0.95rem;
  color: var(--color-black);
  text-decoration: none;
  font-weight: 600;
  display: block;
  margin-bottom: 1rem;
  word-break: break-all;
}

.contact-location {
  color: var(--color-gray-600);
}

.contact-section .social-links {
  justify-content: center;
}

.footer-text {
  text-align: center;
  padding: 2rem 0;
  border-top: 1px solid var(--color-gray-300);
  margin-top: 4rem;
  font-size: 0.875rem;
  color: var(--color-gray-600);
}

.scroll-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 50px;
  height: 50px;
  background: var(--color-black);
  color: var(--color-white);
  border: 2px solid var(--color-black);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.5rem;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  z-index: 1000;
}

.scroll-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.scroll-to-top:hover {
  background: var(--color-white);
  color: var(--color-black);
  transform: translateY(-3px);
}

.label,
.section-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-gray-600);
  display: block;
}

.label {
  margin-bottom: 1rem;
}

.title {
  font-size: 1.75rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 0.75rem;
  color: var(--color-black);
  letter-spacing: -0.02em;
}

.subtitle {
  font-size: 0.95rem;
  color: var(--color-gray-700);
  margin-bottom: 1.5rem;
  line-height: 1.5;
}

.hero-actions {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 1rem;
}

.btn-primary {
  padding: 1rem 2rem;
  background: var(--color-black);
  color: var(--color-white);
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition-base);
  border: 2px solid var(--color-black);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.btn-primary:hover {
  background: var(--color-white);
  color: var(--color-black);
  transform: translateX(4px);
}

.btn-icon {
  width: 100%;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--color-gray-300);
  color: var(--color-gray-700);
  text-decoration: none;
  font-size: 1.25rem;
  transition: var(--transition-base);
}

.btn-icon:hover {
  border-color: var(--color-black);
  color: var(--color-black);
  transform: scale(1.1);
}

.stat {
  text-align: center;
  padding: 1rem;
}

.stat h2 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-black);
  margin-bottom: 0.5rem;
  line-height: 1;
}

.tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.tech-stack span {
  padding: 0.25rem 0.75rem;
  background: var(--color-gray-100);
  border: 1px solid var(--color-gray-300);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-gray-700);
}

.btn-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-black);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.875rem;
  transition: var(--transition-base);
}

.btn-link:hover {
  transform: translateX(4px);
}

.btn-link i {
  transition: var(--transition-base);
}

.btn-link:hover i {
  transform: translateX(4px);
}

.social-links {
  display: flex;
  gap: 1rem;
}

.social-links a {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--color-gray-300);
  color: var(--color-gray-700);
  text-decoration: none;
  font-size: 1.25rem;
  transition: var(--transition-base);
}

.social-links a:hover {
  border-color: var(--color-black);
  color: var(--color-black);
  transform: translateY(-2px);
}

@media (min-width: 600px) {
  .grid-container {
    padding: 90px 2rem 2rem;
    gap: 2.5rem;
  }

  .section-narrow {
    padding-top: 2.5rem;
  }

  .title {
    font-size: 2rem;
  }

  .contact-title {
    font-size: 2rem;
    margin-bottom: 1.75rem;
  }

  .contact-email {
    font-size: 1rem;
  }

  .stats-container {
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
  }

  .stat {
    padding: 1.5rem;
  }

  .stat h2 {
    font-size: 2.25rem;
  }

  .hero-actions {
    flex-direction: row;
    align-items: center;
  }

  .btn-icon {
    width: 48px;
  }

  .project-images {
    max-width: 600px;
    height: 340px;
  }
}

@media (min-width: 768px) {
  .nav-content {
    padding: 1.5rem 2rem;
  }

  .logo {
    font-size: 1.5rem;
  }

  .btn-download {
    padding: 0.75rem 1.5rem;
    font-size: 0.875rem;
    gap: 0.5rem;
  }

  .grid-container {
    padding: 100px 2.5rem 2.5rem;
    gap: 3rem;
  }

  .section-narrow {
    padding-top: 3rem;
  }

  .title {
    font-size: 2.5rem;
  }

  .subtitle {
    font-size: 1rem;
  }

  .contact-title {
    font-size: 2.25rem;
    margin-bottom: 2rem;
  }

  .contact-email {
    font-size: 1.05rem;
  }

  .stat {
    padding: 1.75rem;
  }

  .stat h2 {
    font-size: 2.5rem;
  }

  .project-images {
    max-width: 700px;
    height: 380px;
  }

  .languages-additional-grid {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
  }
}

@media (min-width: 1024px) {
  .hero-section {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    min-height: 50vh;
  }

  .hero-image {
    height: 450px;
  }

  .title {
    font-size: 3rem;
    line-height: 1.1;
  }

  .grid-container {
    gap: 3.5rem;
  }
}

::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-gray-100);
}

::-webkit-scrollbar-thumb {
  background: var(--color-black);
}

.image-modal {
  display: none;
  position: fixed;
  z-index: 2000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.95);
  animation: fadeIn 0.3s ease;
}

.image-modal.active {
  display: block;
}

.modal-content {
  margin: auto;
  display: block;
  max-width: 90%;
  max-height: 85vh;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation: zoomIn 0.3s ease;
}

@keyframes zoomIn {
  from {
    transform: translate(-50%, -50%) scale(0.8);
    opacity: 0;
  }
  to {
    transform: translate(-50%, -50%) scale(1);
    opacity: 1;
  }
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  color: var(--color-white);
  font-size: 2.5rem;
  font-weight: 300;
  cursor: pointer;
  transition: var(--transition-base);
  z-index: 2001;
  line-height: 1;
}

.modal-close:hover {
  color: var(--color-gray-300);
}

.modal-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-white);
  border: 2px solid rgba(255, 255, 255, 0.3);
  font-size: 1.5rem;
  padding: 0.75rem 1rem;
  cursor: pointer;
  transition: var(--transition-base);
  z-index: 2001;
  backdrop-filter: blur(10px);
}

.modal-nav:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: var(--color-white);
}

.modal-prev {
  left: 1rem;
}

.modal-next {
  right: 1rem;
}

.modal-caption {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  color: var(--color-white);
  font-size: 0.875rem;
  text-align: center;
  background: rgba(0, 0, 0, 0.5);
  padding: 0.5rem 1rem;
  border-radius: 4px;
}

@media (min-width: 768px) {
  .modal-close {
    top: 2rem;
    right: 3rem;
    font-size: 3rem;
  }

  .modal-nav {
    font-size: 2rem;
    padding: 1rem 1.5rem;
  }

  .modal-prev {
    left: 2rem;
  }

  .modal-next {
    right: 2rem;
  }
}