@import url('https://fonts.googleapis.com/css2?family=Aleo:ital,wght@0,300..900;1,300..900&display=swap');

:root {
  --color-primary: #1B3A5C;
  --color-accent: #2A9D8F;
  --color-accent-light: #E2F0EE;
  --color-bg: #F4F7F9;
  --color-white: #FFFFFF;
  --color-text: #1A2233;
  --color-text-medium: #4A5568;
  --color-border: #D1E0E8;
  --font-family: 'Aleo', Georgia, serif;
  --max-width: 800px;
  --section-padding: 60px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: 1.1rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
}

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

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-primary);
  padding: 1rem 0;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.18);
}

nav .container {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
}

nav a {
  color: var(--color-white);
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

nav a:hover {
  color: #A8DDD8;
  border-bottom-color: #A8DDD8;
}

nav a:focus-visible {
  outline: 2px solid #A8DDD8;
  outline-offset: 4px;
  border-radius: 2px;
  color: #A8DDD8;
}

header#hero {
  background-color: var(--color-white);
  padding: var(--section-padding) 0;
  text-align: center;
}

.hero-photo {
  width: 220px;
  height: 220px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center top;
  margin: 0 auto 1.5rem;
  border: 4px solid var(--color-accent-light);
  box-shadow: 0 4px 20px rgba(27, 58, 92, 0.14);
}

h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
  line-height: 1.3;
}

.tagline {
  font-size: 1rem;
  color: var(--color-text-medium);
  font-style: italic;
  margin-top: 0.25rem;
  line-height: 1.5;
}

section {
  padding: var(--section-padding) 0;
}

#about {
  background-color: var(--color-bg);
}

#skills {
  background-color: var(--color-white);
}

#projects {
  background-color: var(--color-bg);
}

#contact {
  background-color: var(--color-white);
}

h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-accent-light);
}

#about p {
  margin-bottom: 1rem;
  max-width: 720px;
}

#about p:last-child {
  margin-bottom: 0;
}

.skills-group {
  margin-bottom: 1.75rem;
}

.skills-group:last-child {
  margin-bottom: 0;
}

.skills-group h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-tag {
  display: inline-block;
  padding: 0.3rem 0.9rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 500;
  line-height: 1.5;
}

.skill-tag--technical {
  background-color: var(--color-accent);
  color: var(--color-white);
}

.skill-tag--methodology {
  background-color: var(--color-accent-light);
  color: var(--color-primary);
}

.projects-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.project-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: 0 2px 10px rgba(27, 58, 92, 0.07);
}

.project-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.6rem;
  line-height: 1.35;
}

.project-card p {
  font-size: 0.95rem;
  color: var(--color-text-medium);
  line-height: 1.65;
}

.project-tag {
  display: inline-block;
  margin-top: 0.85rem;
  padding: 0.2rem 0.7rem;
  background-color: var(--color-accent-light);
  color: var(--color-primary);
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
}

#contact p {
  margin-bottom: 1.25rem;
}

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

.contact-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.2rem;
  background-color: var(--color-primary);
  color: var(--color-white);
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  transition: background-color 0.2s ease;
}

.contact-badge:hover {
  background-color: var(--color-accent);
}

.contact-badge:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 8px;
  background-color: var(--color-accent);
}

.contact-badge svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  fill: currentColor;
}

footer {
  background-color: var(--color-primary);
  color: rgba(255, 255, 255, 0.75);
  text-align: center;
  padding: 1.25rem 0;
  font-size: 0.875rem;
}

@media (max-width: 640px) {
  .projects-grid {
    grid-template-columns: 1fr;
  }

  nav .container {
    gap: 1rem;
  }

  nav a {
    font-size: 0.85rem;
  }
}

@media (max-width: 400px) {
  nav .container {
    gap: 0.6rem;
  }

  nav a {
    font-size: 0.8rem;
  }

  h1 {
    font-size: 1.3rem;
  }
}