:root {
  --bg: #f7f9fb;
  --fg: #1a1a1a;
  --accent: #3a7ca5;
  --accent-light: #e3eef7;
  --divider: #d1d9e6;
  --heading: #234567;
  --focus: #ffb703;
  --font-main: 'Inter', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'Fira Mono', 'Consolas', monospace;
  --max-width: 760px;
  --radius: 12px;
  --spacing: 2.5rem;
  --transition: 0.18s cubic-bezier(.4,0,.2,1);
}

html {
  box-sizing: border-box;
  font-size: 18px;
  scroll-behavior: smooth;
  background: var(--bg);
}

*, *::before, *::after {
  box-sizing: inherit;
}

body {
  color: var(--fg);
  font-family: var(--font-main);
  margin: 0;
  padding: 0;
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--bg);
}

header, main, footer {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing) 1.5rem;
  background: #fff;
  border-radius: var(--radius);
  box-shadow: 0 2px 16px rgba(58,124,165,0.04);
}

header {
  text-align: center;
  margin-top: var(--spacing);
  margin-bottom: 1.5rem;
  background: linear-gradient(90deg, var(--accent-light) 0%, #fff 100%);
  border-bottom: 3px solid var(--accent);
  border-radius: var(--radius) var(--radius) 0 0;
}

h1, h2, h3 {
  font-family: var(--font-main);
  color: var(--heading);
  font-weight: 700;
  letter-spacing: 0.01em;
  margin-top: 0;
}

h1 {
  font-size: 2.7rem;
  margin-bottom: 0.2em;
  line-height: 1.1;
  position: relative;
  display: inline-block;
}

h1::after {
  content: '';
  display: block;
  width: 60%;
  height: 4px;
  background: linear-gradient(90deg, var(--accent) 60%, transparent 100%);
  border-radius: 2px;
  margin: 0.3em auto 0;
}

.tagline {
  color: #4a6fa5;
  font-size: 1.15rem;
  font-weight: 500;
  margin-bottom: 0.5em;
  letter-spacing: 0.01em;
}

section {
  margin: var(--spacing) 0;
  padding-bottom: var(--spacing);
  border-bottom: 1.5px solid var(--divider);
  background: transparent;
  transition: background var(--transition);
}

section:last-of-type {
  border-bottom: none;
}

h2 {
  font-size: 1.45rem;
  margin-bottom: 1.1rem;
  letter-spacing: 0.03em;
  position: relative;
  padding-left: 0.5em;
}

h2::before {
  content: '';
  display: inline-block;
  width: 0.35em;
  height: 1.2em;
  background: var(--accent);
  border-radius: 2px;
  margin-right: 0.5em;
  vertical-align: middle;
}

.profile-photo {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 1.1rem;
  border: 3px solid var(--accent);
  box-shadow: 0 2px 12px rgba(58,124,165,0.10);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.profile-photo:focus {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
  border-color: var(--focus);
}

.skills-list {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.skills-list li {
  background: var(--accent-light);
  color: var(--accent);
  padding: 0.55em 1.2em;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  box-shadow: 0 1px 4px rgba(58,124,165,0.06);
  transition: background var(--transition), color var(--transition);
}

.skills-list li:focus,
.skills-list li:hover {
  background: var(--accent);
  color: #fff;
  outline: none;
}

.project-card {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 1.5rem;
  align-items: flex-start;
  background: #fafdff;
  border-radius: var(--radius);
  box-shadow: 0 2px 10px rgba(58,124,165,0.06);
  margin-bottom: 1.7rem;
  padding: 1.2rem;
  border: 1.5px solid var(--divider);
  transition: box-shadow var(--transition), border-color var(--transition);
}

.project-card:hover,
.project-card:focus-within {
  box-shadow: 0 6px 24px rgba(58,124,165,0.13);
  border-color: var(--accent);
}

.project-card img {
  width: 100px;
  height: 100px;
  object-fit: cover;
  border-radius: var(--radius);
  border: 2px solid var(--accent-light);
  background: #fff;
  transition: border-color var(--transition);
}

.project-card img:focus {
  outline: 3px solid var(--focus);
  border-color: var(--focus);
}

.project-card h3 {
  margin: 0 0 0.5em 0;
  font-size: 1.15rem;
  color: var(--heading);
  font-weight: 600;
}

.project-card a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  border-bottom: 1.5px solid var(--accent-light);
  transition: color var(--transition), border-color var(--transition);
  outline: none;
}

.project-card a:hover,
.project-card a:focus {
  color: var(--focus);
  border-color: var(--focus);
  text-decoration: underline;
}

#contact a {
  color: var(--accent);
  text-decoration: underline;
  word-break: break-all;
  font-weight: 500;
  transition: color var(--transition), text-decoration var(--transition);
  outline: none;
}

#contact a:hover,
#contact a:focus {
  color: var(--focus);
  text-decoration: none;
  background: var(--accent-light);
  border-radius: 3px;
}

footer {
  text-align: center;
  color: #6a7a8c;
  font-size: 1rem;
  margin-bottom: 1.5rem;
  margin-top: var(--spacing);
  background: transparent;
  border-radius: 0 0 var(--radius) var(--radius);
  padding-top: 1.2rem;
  border-top: 1.5px solid var(--divider);
}

a, button, .skills-list li {
  outline: none;
}

a:focus-visible,
button:focus-visible,
.skills-list li:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

::-webkit-selection, ::selection {
  background: var(--accent-light);
  color: var(--accent);
}

@media (max-width: 800px) {
  html {
    font-size: 16px;
  }
  header, main, footer {
    padding: 1.2rem 0.7rem;
  }
  .project-card {
    grid-template-columns: 90px 1fr;
    gap: 1rem;
    padding: 1rem;
  }
  .profile-photo {
    width: 90px;
    height: 90px;
  }
}

@media (max-width: 600px) {
  html {
    font-size: 15px;
  }
  header, main, footer {
    padding: 1rem 0.3rem;
    border-radius: 0;
    box-shadow: none;
  }
  header {
    margin-top: 0.7rem;
    border-radius: 0;
  }
  .project-card {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto;
    gap: 0.7rem;
    padding: 0.7rem;
  }
  .profile-photo {
    width: 70px;
    height: 70px;
  }
  section {
    padding-bottom: 1.2rem;
    margin: 1.2rem 0;
  }
}

@media (max-width: 400px) {
  html {
    font-size: 14px;
  }
  .profile-photo {
    width: 54px;
    height: 54px;
  }
}