/* ============================================
   Sergio Valverde — Personal Site
   GitHub Blog dark theme
   Single-file, no dependencies
   ============================================ */

:root {
  --bg: #0d1117;
  --bg-subtle: #161b22;
  --border: #30363d;
  --fg: #c9d1d9;
  --fg-muted: #8b949e;
  --fg-base: #f0f6fc;
  --link: #58a6ff;
  --code: #ff7b72;
  --purple: #a371f7;
  --pink: #f778ba;
  --green: #3fb950;
  --orange: #f0883e;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

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

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; color: #79c0ff; }

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

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================
   Header
   ============================================ */
.header {
  padding: 48px 0 32px;
  text-align: center;
}

.avatar-wrapper {
  position: relative;
  width: 100px;
  height: 100px;
  margin: 0 auto 20px;
}

.avatar {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  border: 3px solid var(--border);
  object-fit: cover;
}

.github-star {
  position: absolute;
  bottom: -2px;
  right: -2px;
  font-size: 20px;
  background: var(--bg);
  border-radius: 50%;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

.name {
  font-size: 28px;
  font-weight: 700;
  color: var(--fg-base);
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.roles {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 15px;
  margin-bottom: 12px;
}

.role a {
  color: var(--fg);
  text-decoration: none;
}
.role a:hover { color: var(--link); text-decoration: underline; }

.tagline {
  font-size: 13px;
  color: var(--fg-muted);
  font-style: italic;
}

/* ============================================
   Sections
   ============================================ */
main section {
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
}
main section:last-of-type { border-bottom: none; }

.section-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--fg-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

/* ============================================
   About
   ============================================ */
.about p {
  margin-bottom: 12px;
  font-size: 15px;
  line-height: 1.7;
}
.about p:last-child { margin-bottom: 0; }
.about strong { color: var(--fg-base); }

/* ============================================
   Skills
   ============================================ */
.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.skill {
  font-size: 12px;
  padding: 4px 12px;
  border-radius: 20px;
  border: 1px solid var(--border);
  color: var(--fg-muted);
  font-weight: 500;
  transition: all 0.2s;
}
.skill:hover {
  border-color: var(--fg-muted);
  color: var(--fg-base);
  text-decoration: none;
}

/* ============================================
   Content cards
   ============================================ */
.content-card {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 12px;
  transition: border-color 0.2s;
}
.content-card:last-child { margin-bottom: 0; }
.content-card:hover { border-color: var(--fg-muted); }

.card-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 8px;
  border-radius: 10px;
  display: inline-block;
  margin-bottom: 8px;
}

.label-blog { color: var(--green); background: rgba(63,185,80,0.12); }
.label-newsletter { color: var(--purple); background: rgba(163,113,247,0.12); }
.label-youtube { color: #ff0000; background: rgba(255,0,0,0.1); }
.label-talks { color: var(--pink); background: rgba(247,120,186,0.12); }

.card-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--fg-base);
  margin-bottom: 6px;
}
.card-title a { color: var(--fg-base); text-decoration: none; }
.card-title a:hover { color: var(--link); text-decoration: underline; }

.card-desc {
  font-size: 14px;
  color: var(--fg-muted);
  line-height: 1.5;
  margin-bottom: 10px;
}

.card-link {
  font-size: 13px;
  color: var(--link);
  font-weight: 500;
}
.card-link:hover { text-decoration: underline; }

/* Newsletter form */
.newsletter-form {
  display: flex;
  gap: 8px;
  margin-top: 10px;
}
.newsletter-input {
  flex: 1;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--fg-base);
  font-family: inherit;
  min-width: 0;
}
.newsletter-input:focus {
  outline: none;
  border-color: var(--purple);
  box-shadow: 0 0 0 3px rgba(163,113,247,0.2);
}
.newsletter-input::placeholder { color: var(--fg-muted); }
.subscribe-btn {
  background: linear-gradient(135deg, var(--purple), var(--pink));
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  white-space: nowrap;
  transition: opacity 0.2s;
}
.subscribe-btn:hover { opacity: 0.85; text-decoration: none; }

/* Talks list */
.talks-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.talks-list li { font-size: 14px; line-height: 1.5; }
.talks-list a {
  color: var(--fg-muted);
  text-decoration: none;
  border-bottom: 1px dotted var(--border);
}
.talks-list a:hover { color: var(--link); border-bottom-color: var(--link); text-decoration: none; }

/* ============================================
   Social links
   ============================================ */
.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.social-link {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--fg-muted);
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  transition: all 0.2s;
  text-decoration: none;
}
.social-link:hover {
  color: var(--fg-base);
  border-color: var(--fg-muted);
  text-decoration: none;
}

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

/* ============================================
   Footer
   ============================================ */
.footer {
  padding: 32px 0 48px;
  text-align: center;
  border-top: 1px solid var(--border);
  margin-top: 16px;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 12px;
}
.footer-links a {
  font-size: 13px;
  color: var(--fg-muted);
}
.footer-links a:hover { color: var(--fg-base); }

.copyright {
  font-size: 12px;
  color: var(--fg-muted);
}

/* ============================================
   Responsive — mobile first
   ============================================ */
@media (max-width: 600px) {
  .container { padding: 0 16px; }
  .header { padding: 32px 0 24px; }
  .avatar-wrapper { width: 80px; height: 80px; }
  .name { font-size: 24px; }
  .roles { font-size: 14px; }
  .about p { font-size: 14px; }
  .content-card { padding: 16px; }
  .card-title { font-size: 16px; }
  .newsletter-form { flex-direction: column; }
  .subscribe-btn { width: 100%; }
  .social-links { flex-direction: column; }
  .social-link { justify-content: center; }
  .footer-links { flex-wrap: wrap; gap: 12px; }
}

/* Smooth scroll */
html { scroll-behavior: smooth; }