:root {
  --font-primary: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  --font-mono: "Space Mono", "Courier New", monospace;
  --font-hero: "Anton", sans-serif;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;

  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;

  --max-width: 1200px;
  --nav-height: 60px;
}

[data-theme="dark"] {
  --color-bg: #0a0a0a;
  --color-surface: #141414;
  --color-border: #282828;
  --color-text-primary: #f5f5f5;
  --color-text-secondary: #a0a0a0;
  --color-text-tertiary: #707070;
  --color-accent: #ffffff;
  --color-hover: #1f1f1f;
}

[data-theme="light"] {
  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-border: #e5e5e5;
  --color-text-primary: #0a0a0a;
  --color-text-secondary: #525252;
  --color-text-tertiary: #a0a0a0;
  --color-accent: #0a0a0a;
  --color-hover: #f5f5f5;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg);
  transition: background-color var(--transition-base),
    color var(--transition-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

ul {
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  loading: lazy;
  decoding: async;
  display: block;
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@font-face {
  font-family: "Inter";
  font-display: swap;
}

@font-face {
  font-family: "Space Mono";
  font-display: swap;
}

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: background-color var(--transition-base),
    border-color var(--transition-base);
}

.nav-container {
  max-width: var(--max-width);
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
  letter-spacing: 0.01em;
  padding: var(--space-2) 0;
  position: relative;
}

.nav-link:hover {
  color: var(--color-text-primary);
}

.nav-link.active {
  color: var(--color-text-primary);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background-color: var(--color-text-primary);
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 4px;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  color: var(--color-text-primary);
  background-color: var(--color-hover);
}

.theme-icon {
  width: 20px;
  height: 20px;
}

[data-theme="dark"] .sun-icon {
  display: none;
}

[data-theme="light"] .moon-icon {
  display: none;
}

.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 36px;
  height: 36px;
  gap: 5px;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.hamburger:hover {
  color: var(--color-text-primary);
}

.hamburger-line {
  width: 24px;
  height: 2px;
  background-color: currentColor;
  border-radius: 1px;
  transition: all var(--transition-base);
}

.hamburger.active .hamburger-line:nth-child(1) {
  transform: rotate(45deg) translate(8px, 8px);
}

.hamburger.active .hamburger-line:nth-child(2) {
  opacity: 0;
}

.hamburger.active .hamburger-line:nth-child(3) {
  transform: rotate(-45deg) translate(3px, -3px);
}

.main {
  min-height: calc(100dvh - var(--nav-height) -80px);
  padding-top: var(--nav-height);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.content-area {
  padding-top: var(--space-16);
}

.section {
  opacity: 0;
  animation: fadeIn var(--transition-slow) forwards;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.section-title {
  font-size: var(--text-4xl);
  font-weight: 600;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-12);
  color: var(--color-text-primary);
}

.section-subtitle {
  font-size: var(--text-xl);
  font-weight: 500;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-6);
  color: var(--color-text-primary);
}

.hero {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: var(--space-12);
  align-items: center;
}

.hero-text {
  max-width: 650px;
}

.hero-image-container {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-img {
  width: 800%;
  max-width: 600px;
  height: auto;
}

.hero:hover .hero-img {
  border-color: var(--color-text-tertiary);
}

.hero-title {
  font-size: var(--text-5xl);
  font-weight: bolder;
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin-bottom: var(--space-4);
}

.hero-subtitle {
  font-size: var(--text-2xl);
  font-weight: 400;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-8);
  letter-spacing: -0.02em;
}

.hero-description {
  font-size: var(--text-lg);
  line-height: 1.7;
  color: var(--color-text-secondary);
}

.hero-description p {
  margin-bottom: var(--space-6);
}

.about-contact-links {
  display: flex;
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.about-contact-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
  font-size: 1.25rem;
}

.about-contact-link:hover {
  color: var(--color-text-primary);
  border-color: var(--color-text-primary);
  background-color: var(--color-hover);
  transform: translateY(-2px);
}

.experience-list {
  display: grid;
  gap: var(--space-12);
}

.experience-item {
  border-left: 1px solid var(--color-border);
  padding-left: var(--space-6);
  position: relative;
}

.experience-item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background-color: var(--color-text-primary);
}

.experience-header {
  margin-bottom: var(--space-3);
}

.experience-role {
  font-size: var(--text-xl);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-1);
}

.experience-company {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-1);
}

.experience-period {
  font-size: var(--text-sm);
  font-family: var(--font-mono);
  color: var(--color-text-tertiary);
}

.experience-description {
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-text-secondary);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-8);
}

.skill-category {
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: 2px;
  transition: border-color var(--transition-fast);
}

.skill-category:hover {
  border-color: var(--color-text-tertiary);
}

.skill-category-title {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-4);
  letter-spacing: -0.01em;
}

.skill-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.skill-tag {
  font-size: var(--text-sm);
  font-family: var(--font-mono);
  padding: var(--space-2) var(--space-3);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 2px;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.skill-tag i {
  font-size: 1.2em;
}

.skill-tag:hover {
  background-color: var(--color-hover);
  color: var(--color-text-primary);
}

.contact-content {
  max-width: 700px;
}

.contact-description {
  font-size: var(--text-lg);
  line-height: 1.8;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-12);
  font-weight: 400;
}

.contact-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
}

.contact-link {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: 2px;
  background-color: transparent;
  transition: all var(--transition-base);
  text-decoration: none;
  color: var(--color-text-primary);
  position: relative;
  overflow: hidden;
}

.contact-link::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background-color: var(--color-border);
  transition: all var(--transition-base);
}

.contact-link:hover {
  border-color: var(--color-text-secondary);
  background-color: var(--color-hover);
}

.contact-link:hover::before {
  height: 2px;
  background-color: var(--color-text-primary);
}

.contact-icon {
  font-size: 1.5rem;
  margin-bottom: var(--space-3);
  color: var(--color-text-secondary);
  transition: color var(--transition-base);
}

.contact-link:hover .contact-icon {
  color: var(--color-text-primary);
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  width: 100%;
}

.contact-link-label {
  font-size: var(--text-sm);
  font-family: var(--font-primary);
  font-weight: 600;
  color: var(--color-text-primary);
  letter-spacing: 0.01em;
}

.contact-link:hover .contact-link-label {
  color: var(--color-text-primary);
}

.contact-link span:not(.contact-link-label) {
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  color: var(--color-text-tertiary);
  transition: color var(--transition-base);
  word-break: break-all;
}

.contact-link:hover span:not(.contact-link-label) {
  color: var(--color-text-secondary);
}

.footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-8) 0;
  margin-top: var(--space-24);
}

.footer-text {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  text-align: center;
}

@media (max-width: 768px) {
  :root {
    --text-5xl: 2.25rem;
    --text-4xl: 1.875rem;
    --text-3xl: 1.5rem;
    --text-2xl: 1.25rem;
  }

  .nav-container {
    padding: 0 var(--space-4);
  }

  .container {
    padding: 0 var(--space-4);
  }

  .hamburger {
    display: flex;
  }

  .nav-menu {
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    gap: 0;
    padding: var(--space-4) 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
    z-index: 999;
  }

  .nav-menu.active {
    max-height: 300px;
  }

  .nav-menu li {
    width: 100%;
  }

  .nav-menu li button {
    width: 100%;
    padding: var(--space-3) var(--space-6);
    text-align: left;
    border-radius: 0;
  }

  .nav-menu li:last-child {
    display: flex;
    justify-content: center;
    padding: var(--space-3) 0;
    border-top: 1px solid var(--color-border);
  }

  .nav-link {
    font-size: var(--text-sm);
    padding: 0;
  }

  .nav-link.active::after {
    display: none;
  }

  .nav-link:hover {
    background-color: var(--color-hover);
  }

  .content-area {
    padding: var(--space-12) 0;
  }

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

  .hero {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-text {
    margin: 0 auto;
  }

  .about-contact-links {
    justify-content: center;
  }

  .contact-links {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .nav-logo {
    font-size: var(--text-base);
  }

  .nav-menu {
    gap: var(--space-2);
  }

  .contact-link {
    padding: var(--space-4);
  }

  .contact-icon {
    font-size: 1.25rem;
  }
}

@media (prefers-color-scheme: dark) {
  body {
    color-scheme: dark;
  }
}

@media (prefers-color-scheme: light) {
  body {
    color-scheme: light;
  }
}

:focus-visible {
  outline: 2px solid var(--color-text-primary);
  outline-offset: 2px;
}

button:focus-visible {
  outline: 2px solid var(--color-text-primary);
  outline-offset: 2px;
}

a:focus-visible {
  outline: 2px solid var(--color-text-primary);
  outline-offset: 2px;
}