/* ===== Variáveis e base ===== */
:root {
  --bg: #0d1117;
  --bg-card: #161b22;
  --bg-elevated: #21262d;
  --border: #30363d;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --accent: #58a6ff;
  --accent-green: #3fb950;
  --accent-cyan: #79c0ff;
  --accent-purple: #a371f7;
  --accent-orange: #d29922;
  --font-mono: 'JetBrains Mono', monospace;
  --font-sans: 'DM Sans', system-ui, sans-serif;
  --radius: 8px;
  --radius-lg: 12px;
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Skip link (acessibilidade) */
.skip-link {
  position: absolute;
  top: -3rem;
  left: 1rem;
  z-index: 1000;
  padding: 0.5rem 1rem;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  border-radius: var(--radius);
  transition: top var(--transition);
}

.skip-link:focus {
  top: 1rem;
  outline: 2px solid var(--accent-cyan);
  outline-offset: 2px;
}

/* Ruído sutil no fundo */
.noise {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--accent-cyan);
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

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

.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* ===== Header e navegação ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 3.5rem;
}

.nav-logo {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--text);
}

.nav-logo:hover {
  color: var(--accent);
}

.nav-menu {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-menu a {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.nav-menu a:hover {
  color: var(--text);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--text);
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== Seletor de idioma ===== */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: 2px;
}

.lang-btn {
  padding: 0.35rem 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-muted);
  cursor: pointer;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}

.lang-btn:hover {
  color: var(--text);
  border-color: var(--text-muted);
}

.lang-btn.is-active,
.lang-btn[aria-current="true"] {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* ===== Hero ===== */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 6rem 0 4rem;
  position: relative;
}

.hero-inner {
  position: relative;
  z-index: 1;
}

.hero-greeting {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.hero-title {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 6vw, 3.5rem);
  font-weight: 700;
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
}

.hero-title .cursor {
  color: var(--accent-green);
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--accent-cyan);
  margin: 0 0 0.75rem;
}

.hero-tagline {
  font-style: italic;
  color: var(--text-muted);
  margin: 0 0 2rem;
  max-width: 32ch;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1.25rem;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius);
  transition: background var(--transition), color var(--transition), border-color var(--transition);
  cursor: pointer;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border: 1px solid var(--accent);
}

.btn-primary:hover {
  background: var(--accent-cyan);
  border-color: var(--accent-cyan);
  color: #0d1117;
}

.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-outline:hover {
  border-color: var(--text-muted);
  background: var(--bg-elevated);
}

.hero-code {
  position: absolute;
  bottom: 2rem;
  right: 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  opacity: 0.5;
  max-width: 90%;
  overflow: hidden;
}

.hero-code pre {
  margin: 0;
}

.hero-code .comment { color: #8b949e; }
.hero-code .keyword { color: #ff7b72; }
.hero-code .var { color: #ffa657; }
.hero-code .string { color: #a5d6ff; }

/* ===== Secções genéricas ===== */
.section {
  padding: 4rem 0;
  border-top: 1px solid var(--border);
}

.section-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.section-title {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  margin: 0 0 1.5rem;
}

.grid {
  display: grid;
  gap: 2rem;
}

.grid-2 {
  grid-template-columns: 1fr 1fr;
  align-items: center;
}

/* ===== Sobre ===== */
.sobre-content p {
  margin: 0 0 1rem;
  color: var(--text-muted);
  max-width: 50ch;
}

.sobre-highlights {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
}

.sobre-highlights li {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--accent-cyan);
  padding: 0.25rem 0.5rem;
  background: rgba(121, 192, 255, 0.08);
  border-radius: var(--radius);
}

.sobre-photo {
  position: relative;
  justify-self: center;
}

.sobre-photo img {
  width: 280px;
  height: 280px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
}

.sobre-photo-frame {
  position: absolute;
  inset: -8px -8px -8px -8px;
  border: 2px solid var(--accent);
  border-radius: calc(var(--radius-lg) + 4px);
  opacity: 0.3;
  pointer-events: none;
}

/* ===== Estatísticas ===== */
.estatisticas .section-title {
  margin-bottom: 2rem;
}

.estatisticas-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1.5rem;
  max-width: 600px;
  margin: 0 auto;
}

.estatistica-item {
  text-align: center;
  padding: 1.5rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition);
}

.estatistica-item:hover {
  border-color: var(--accent);
}

.estatistica-numero {
  display: block;
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-bottom: 0.25rem;
}

.estatistica-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ===== Formação ===== */
.formacao-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.formacao-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  transition: border-color var(--transition);
}

.formacao-card:hover {
  border-color: var(--accent);
}

.formacao-card h3 {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 0.75rem;
  color: var(--text);
}

.formacao-card ul {
  margin: 0;
  padding-left: 1.25rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

.formacao-card li {
  margin-bottom: 0.35rem;
}

/* ===== Stack ===== */
.stack-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.stack-item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 0.35rem 0.6rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  transition: border-color var(--transition), color var(--transition), background var(--transition);
}

.stack-item:hover {
  border-color: var(--accent);
  color: var(--text);
  background: var(--bg-elevated);
}

.stack-item img {
  width: 18px;
  height: 18px;
  display: block;
}

/* ===== Projetos ===== */
.projetos-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  transition: border-color var(--transition), transform var(--transition);
}

.card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.card h3 {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
  color: var(--text);
}

.card p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.card-link {
  position: relative;
  padding-bottom: 2.25rem;
}

.card-link-label {
  position: absolute;
  bottom: 1rem;
  left: 1.25rem;
  font-size: 0.85rem;
  font-weight: 600;
}

.card-links {
  position: absolute;
  bottom: 1rem;
  left: 1.25rem;
  right: 1.25rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
}

.card-links .card-link-label {
  position: static;
}

/* ===== Contacto ===== */
.contacto-lead {
  color: var(--text-muted);
  margin: 0 0 1.5rem;
}

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

.contacto-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-weight: 600;
  color: var(--text);
}

.contacto-icon {
  flex-shrink: 0;
}

.contacto-link:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ===== Footer ===== */
.footer {
  padding: 2rem 0;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer-text {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 0 0 0.25rem;
}

.footer-copy {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 0;
}

/* ===== Responsivo ===== */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 3.5rem;
    left: 0;
    right: 0;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 1rem;
    gap: 0;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition), opacity var(--transition), visibility var(--transition);
  }

  .nav-menu.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-menu li {
    border-bottom: 1px solid var(--border);
  }

  .nav-menu li:last-child {
    border-bottom: none;
  }

  .nav-menu a {
    display: block;
    padding: 0.75rem;
  }

  .nav .lang-switcher {
    margin-right: 0.5rem;
  }

  .nav .lang-switcher .lang-btn {
    padding: 0.3rem 0.4rem;
    font-size: 0.7rem;
  }

  .grid-2 {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .sobre-content p {
    max-width: none;
  }

  .sobre-highlights {
    justify-content: center;
  }

  .sobre-photo {
    order: -1;
  }

  .hero-code {
    display: none;
  }

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

@media (max-width: 480px) {
  .hero-cta {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .contacto-links {
    flex-direction: column;
  }

  .contacto-link {
    justify-content: center;
  }
}

/* Animações ao scroll (quando JS ativo) */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Páginas de detalhe de projeto ===== */
.project-page {
  padding: 6rem 0 4rem;
  min-height: 60vh;
}

.project-back {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.project-back:hover {
  color: var(--accent);
}

.project-detail {
  max-width: 720px;
}

.project-title {
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  margin: 0 0 0.25rem;
  color: var(--text);
}

.project-subtitle {
  font-size: 1rem;
  color: var(--accent-cyan);
  margin: 0 0 2rem;
}

.project-section {
  margin-bottom: 2rem;
}

.project-section h2 {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 0.75rem;
  color: var(--text);
}

.project-section p {
  margin: 0 0 0.75rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.project-meta {
  list-style: none;
  margin: 0;
  padding: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.project-meta li::before {
  content: "→ ";
  color: var(--accent);
}

.project-related {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.95rem;
}

.project-related a {
  font-weight: 600;
}