:root {
  --bg: #000000;
  --bg-card: #111111;
  --bg-card-hover: #1a1a1a;
  --text: #ffffff;
  --text-muted: #d1d5db;
  --text-subtle: #9ca3af;
  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.18);
  --font-body: 'Signika', sans-serif;
  --font-handwritten: 'Nothing You Could Do', cursive;
  --radius: 0.25rem;
  --transition: 0.35s ease;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  min-height: 100vh;
  padding: 0 1.25rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  opacity: 0;
  transition: opacity 0.5s ease;
}

img,
video {
  display: block;
  max-width: 100%;
  height: auto;
}

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

ul {
  list-style: none;
}

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
}

.site-header {
  display: flex;
  width: 100%;
  overflow: hidden;
  padding-top: 2.5rem;
  padding-bottom: 0.25rem;
}

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

.nav-logo {
  font-size: 1.5rem;
  font-weight: 700;
  margin-right: 2rem;
  white-space: nowrap;
}

.burger {
  display: none;
  position: relative;
  width: 20px;
  height: 20px;
  margin-left: auto;
  -webkit-tap-highlight-color: transparent;
}

.burger-line {
  display: block;
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  background: var(--text);
  transition: transform 0.5s ease, opacity 0.5s ease;
}

.burger-line:nth-child(1) {
  top: 4px;
}

.burger-line:nth-child(2) {
  top: 10px;
}

.burger-line:nth-child(3) {
  top: 16px;
}

.nav-open .burger-line:nth-child(1) {
  top: 10px;
  transform: rotate(45deg);
}

.nav-open .burger-line:nth-child(2) {
  opacity: 0;
}

.nav-open .burger-line:nth-child(3) {
  top: 10px;
  transform: rotate(-45deg);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-left: auto;
}

.nav-link {
  font-size: 1.5rem;
  font-weight: 400;
  position: relative;
  -webkit-tap-highlight-color: transparent;
}

.nav-link--active::after {
  content: '';
  display: block;
  height: 2px;
  background: var(--text);
  margin-top: 2px;
}

.nav-link:not(.nav-link--active)::after {
  content: '';
  display: block;
  height: 2px;
  background: var(--text);
  max-width: 0;
  transition: max-width 0.5s ease;
  margin-top: 2px;
}

.nav-link:not(.nav-link--active):hover::after {
  max-width: 100%;
}

.page-title {
  font-size: 2.25rem;
  font-weight: 700;
  padding: 2.5rem 0 2rem;
}

.filter-bar {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 0.5rem 1.5rem;
  border: 1px solid var(--border-hover);
  border-radius: 999px;
  background: transparent;
  color: var(--text-muted);
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: all var(--transition);
  -webkit-tap-highlight-color: transparent;
}

.filter-btn:hover {
  border-color: rgba(255, 255, 255, 0.45);
  color: var(--text);
}

.filter-btn.active {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}

.site-footer {
  max-width: 1280px;
  padding: 4rem 0;
  margin: 0 auto;
  text-align: center;
}

.footer-name {
  font-weight: 700;
}

.footer-contact {
  margin-top: 1rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.8;
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-top: 2rem;
  color: var(--text-muted);
}

.social-links a {
  transition: opacity var(--transition);
}

.social-links a:hover {
  opacity: 0.7;
}

.social-links svg {
  width: 24px;
  height: 24px;
}

.footer-copy {
  margin-top: 2rem;
  font-size: 0.75rem;
  color: var(--text-subtle);
}

.footer-copy a {
  text-decoration: underline;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: center;
}

.avatar-card {
  background: var(--bg-card);
  padding: 1rem;
  padding-bottom: 5rem;
  border: 1px solid var(--border);
  margin: 2rem;
  transform: rotate(-4deg);
  transition: transform 0.5s ease;
  position: relative;
}

.avatar-card:hover {
  transform: rotate(0deg);
}

.avatar-card img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}

.avatar-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  text-align: center;
  padding-bottom: 0.75rem;
  font-family: var(--font-handwritten);
  font-size: 2.8rem;
  color: var(--text-muted);
}

.bio-section {
  font-size: 1rem;
  line-height: 1.7;
}

.bio-greeting {
  font-size: 1.875rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
}

.bio-section p {
  margin-bottom: 1rem;
  color: var(--text-muted);
}

.bio-section a.get-in-touch {
  color: var(--text);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: opacity var(--transition);
}

.bio-section a.get-in-touch:hover {
  opacity: 0.7;
}

.wave {
  animation: wave 2.5s infinite;
  transform-origin: 70% 70%;
  display: inline-block;
}

@keyframes wave {
  0%   { transform: rotate(0deg); }
  10%  { transform: rotate(14deg); }
  20%  { transform: rotate(-8deg); }
  30%  { transform: rotate(14deg); }
  40%  { transform: rotate(-4deg); }
  50%  { transform: rotate(10deg); }
  60%  { transform: rotate(0deg); }
  100% { transform: rotate(0deg); }
}

.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  text-align: center;
  padding: 4rem 0 2.5rem;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  max-width: 960px;
  margin: 0 auto;
  padding-bottom: 2rem;
}

.skill-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2.5rem 1.5rem;
  text-align: center;
  overflow: hidden;
  transition: transform 0.4s ease, border-color 0.4s ease;
}

.skill-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.06) 0%, transparent 70%);
  transform: scale(0);
  transition: transform 0.6s ease;
  border-radius: 50%;
}

.skill-card:hover::before {
  transform: scale(4);
}

.skill-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
}

.skill-card img {
  width: 36px;
  height: 36px;
  margin: 0 auto 1rem;
  filter: invert(1);
  opacity: 0.9;
}

.skill-card h3 {
  font-size: 1rem;
  font-weight: 600;
  position: relative;
}

html, body {
  overflow-x: hidden;
}

@media (min-width: 768px) {
  body {
    padding: 0 5rem;
  }
}

@media (max-width: 767px) {
  body {
    padding: 0 1rem;
  }

  .site-header {
    padding-top: 1.5rem;
  }

  .page-title {
    font-size: 1.75rem;
    padding: 1.5rem 0 1.25rem;
  }

  .burger {
    display: block;
  }

  .nav-links {
    flex-basis: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease, margin-top 0.5s ease;
  }

  .nav-links.menu-visible {
    max-height: 200px;
    margin-top: 1.25rem;
  }

  .nav-link {
    font-size: 1.25rem;
    padding: 0.25rem 0;
  }

  .nav-link::after {
    display: none !important;
  }

  .filter-bar {
    gap: 0.5rem;
    margin-bottom: 1.25rem;
  }

  .filter-btn {
    padding: 0.625rem 1.25rem;
    font-size: 0.8rem;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .avatar-card {
    max-width: 280px;
    margin: 1rem auto;
    padding-bottom: 3.5rem;
  }

  .avatar-caption {
    font-size: 2rem;
  }

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

  .bio-greeting-mobile {
    display: block;
  }

  .bio-greeting-desktop {
    display: none;
  }

  .bio-greeting {
    font-size: 1.5rem;
    margin-bottom: 1rem;
  }

  .section-title {
    font-size: 1.75rem;
    padding: 2.5rem 0 1.5rem;
  }

  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
  }

  .skill-card {
    padding: 1.75rem 1rem;
  }

  .site-footer {
    padding: 2.5rem 0;
  }
}

@media (min-width: 768px) {
  .bio-greeting-mobile {
    display: none;
  }

  .bio-greeting-desktop {
    display: block;
  }
}

@media (max-width: 380px) {
  body {
    padding: 0 0.75rem;
  }

  .nav-logo {
    font-size: 1.2rem;
  }

  .page-title {
    font-size: 1.5rem;
  }

  .filter-btn {
    padding: 0.5rem 1rem;
    font-size: 0.75rem;
  }

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