/* ==========================================================================
   Gelson Marcelo — Developer homepage
   ========================================================================== */

:root {
  --bg: #0f1419;
  --bg-elevated: #1a222d;
  --bg-card: #1e2836;
  --text: #e8edf4;
  --text-muted: #9aa8b8;
  --accent: #5b9fd4;
  --accent-hover: #7eb8e8;
  --accent-rgb: 91, 159, 212;
  --accent-soft: rgba(var(--accent-rgb), 0.15);
  --accent-glow: rgba(var(--accent-rgb), 0.18);
  --accent-glow-soft: rgba(var(--accent-rgb), 0.06);
  --accent-border: rgba(var(--accent-rgb), 0.25);
  --accent-border-hover: rgba(var(--accent-rgb), 0.35);
  --border: rgba(255, 255, 255, 0.08);
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --max-width: 1080px;
  --header-h: 64px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -20%, var(--accent-glow), transparent),
    radial-gradient(ellipse 60% 40% at 100% 50%, var(--accent-glow-soft), transparent);
  min-height: 100vh;
}

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

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease;
}

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

.container {
  width: min(100% - 2rem, var(--max-width));
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  padding: 0.5rem 1rem;
  background: var(--accent);
  color: var(--bg);
  border-radius: var(--radius);
  z-index: 100;
  font-weight: 600;
}

.skip-link:focus {
  top: 1rem;
}

/* Header ------------------------------------------------------------------ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  background: rgba(15, 20, 25, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  height: auto;
  min-height: var(--header-h);
  padding: 0.5rem 0;
}

.lang-switcher {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.2rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 999px;
}

.lang-switcher__btn {
  font: inherit;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 0.35rem 0.65rem;
  border: none;
  border-radius: 999px;
  cursor: pointer;
  color: var(--text-muted);
  background: transparent;
  transition: color 0.2s ease, background 0.2s ease;
}

.lang-switcher__btn:hover {
  color: var(--text);
}

.lang-switcher__btn[aria-pressed="true"] {
  color: var(--bg);
  background: var(--accent);
}

.lang-switcher__btn[aria-pressed="true"]:hover {
  color: var(--bg);
  background: var(--accent-hover);
}

.logo {
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.02em;
}

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

.nav {
  display: flex;
  gap: 1.5rem;
}

.nav a {
  color: var(--text-muted);
  font-size: 0.9rem;
}

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

/* Hero -------------------------------------------------------------------- */

.hero {
  padding: 3rem 0 4rem;
}

.hero-grid {
  display: grid;
  gap: 2.5rem;
  align-items: center;
}

@media (min-width: 768px) {
  .hero-grid {
    grid-template-columns: 1fr auto;
    gap: 3rem;
  }
}

.eyebrow {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin: 0 0 0.75rem;
}

.hero h1 {
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 1rem;
  letter-spacing: -0.03em;
}

.highlight {
  color: var(--accent);
}

.lead {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin: 0 0 1.75rem;
  max-width: 36ch;
}

.lead strong {
  color: var(--text);
  font-weight: 600;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.15s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent);
  color: var(--bg);
}

.btn-primary:hover {
  background: var(--accent-hover);
  color: var(--bg);
}

.btn-secondary {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Avatar / placeholders --------------------------------------------------- */

.hero-visual {
  display: flex;
  justify-content: center;
}

.avatar-frame {
  width: min(280px, 70vw);
  aspect-ratio: 1;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid var(--border);
  box-shadow: var(--shadow);
  background: var(--bg-card);
  position: relative;
}

.avatar-frame .avatar-img,
.avatar-frame .avatar-placeholder {
  position: absolute;
  inset: 0;
}

.avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 1;
}

.img-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  width: 100%;
  height: 100%;
  min-height: 120px;
  padding: 1rem;
  text-align: center;
  background: repeating-linear-gradient(
    -45deg,
    var(--bg-elevated),
    var(--bg-elevated) 8px,
    var(--bg-card) 8px,
    var(--bg-card) 16px
  );
  border: 2px dashed var(--border);
  color: var(--text-muted);
  font-size: 0.75rem;
}

.img-placeholder span {
  font-family: ui-monospace, monospace;
  font-size: 0.7rem;
  word-break: break-all;
  color: var(--accent);
}

.img-placeholder small {
  font-size: 0.8rem;
  opacity: 0.85;
}

.avatar-placeholder {
  border-radius: 50%;
}

/* Sections ---------------------------------------------------------------- */

.section {
  padding: 3.5rem 0;
}

.section h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 0 1rem;
  letter-spacing: -0.02em;
}

.section-intro {
  color: var(--text-muted);
  margin: -0.5rem 0 2rem;
  max-width: 50ch;
}

.about {
  background: var(--bg-elevated);
  border-block: 1px solid var(--border);
}

.about-grid {
  display: grid;
  gap: 1.25rem;
  margin-bottom: 1.75rem;
}

@media (min-width: 640px) {
  .about-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

.about-grid p {
  margin: 0;
  color: var(--text-muted);
}

.stack-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.stack-tags li {
  padding: 0.35rem 0.85rem;
  font-size: 0.85rem;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 999px;
  border: 1px solid var(--accent-border);
}

/* Projects ---------------------------------------------------------------- */

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

@media (min-width: 720px) {
  .project-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.project-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

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

.project-media {
  aspect-ratio: 9 / 16;
  max-height: 280px;
  background: var(--bg-elevated);
  overflow: hidden;
  position: relative;
}

.project-media .project-img,
.project-media .project-placeholder {
  position: absolute;
  inset: 0;
}

.project-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  z-index: 1;
}

.project-placeholder {
  aspect-ratio: 9 / 16;
  max-height: 280px;
  width: 100%;
}

.project-body {
  padding: 1.25rem 1.5rem 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.project-body h3 {
  margin: 0 0 0.25rem;
  font-size: 1.2rem;
}

.project-tag {
  font-size: 0.8rem;
  color: var(--accent);
  margin: 0 0 0.75rem;
}

.project-body > p:not(.project-tag) {
  margin: 0 0 1rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  flex: 1;
}

.project-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 500;
}

/* Contact ----------------------------------------------------------------- */

.contact-box {
  padding: 2rem;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  text-align: center;
}

.contact-box h2 {
  margin-top: 0;
}

.contact-box > p {
  color: var(--text-muted);
  margin: 0 0 1.5rem;
}

.contact-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem 1.5rem;
}

.contact-links a {
  font-weight: 500;
}

/* Footer ------------------------------------------------------------------ */

.site-footer {
  padding: 2rem 0;
  margin-top: 2rem;
  border-top: 1px solid var(--border);
}

.footer-inner {
  text-align: center;
}

.site-footer p {
  margin: 0.35rem 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-note a {
  font-weight: 500;
}