/*
 * Sistema de diseño — jhonja.com
 * Variables CSS + componentes reutilizables. Mobile-first.
 */

:root {
  --color-bg: #ffffff;
  --color-surface: #f4f6f9;
  --color-surface-2: #eaeef3;
  --color-text: #16202a;
  --color-text-muted: #55636f;
  --color-border: #e2e6ea;
  --color-primary: #1d4ed8;
  --color-primary-hover: #1e40af;
  --color-primary-soft: #e8edfc;
  --color-accent: #0d9488;
  --color-danger: #dc2626;
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.06);
  --shadow-md: 0 4px 16px rgba(16, 24, 40, 0.08);
  --shadow-lg: 0 12px 32px rgba(16, 24, 40, 0.12);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --container-width: 1080px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #0b1220;
    --color-surface: #121a2c;
    --color-surface-2: #182238;
    --color-text: #e7ecf3;
    --color-text-muted: #98a4b8;
    --color-border: #24304a;
    --color-primary: #5b8def;
    --color-primary-hover: #7ba1f2;
    --color-primary-soft: #182a4d;
    --color-accent: #2dd4bf;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.45);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --color-bg: #0b1220;
  --color-surface: #121a2c;
  --color-surface-2: #182238;
  --color-text: #e7ecf3;
  --color-text-muted: #98a4b8;
  --color-border: #24304a;
  --color-primary: #5b8def;
  --color-primary-hover: #7ba1f2;
  --color-primary-soft: #182a4d;
  --color-accent: #2dd4bf;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.45);
  color-scheme: dark;
}

html {
  box-sizing: border-box;
  scroll-behavior: smooth;
}
*, *::before, *::after { box-sizing: inherit; }

body {
  margin: 0;
  font-family: var(--font-sans);
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.2s ease, color 0.2s ease;
}

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

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--color-primary);
  color: #fff;
  padding: 0.75rem 1rem;
  z-index: 100;
  border-radius: 0 0 var(--radius-sm) 0;
}
.skip-link:focus { left: 0; }

/* Header / nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--color-bg);
  background: color-mix(in srgb, var(--color-bg) 88%, transparent);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--color-border);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 0.85rem;
  padding-bottom: 0.85rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--color-primary);
  color: #fff;
  font-weight: 800;
  font-size: 1.15rem;
  line-height: 1;
}
.brand:hover { text-decoration: none; background: var(--color-primary-hover); color: #fff; }

.main-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.1rem;
  align-items: center;
}
.main-nav a {
  color: var(--color-text-muted);
  font-weight: 600;
  font-size: 0.92rem;
  padding: 0.4rem 0.2rem;
}
.main-nav a:hover, .main-nav a.active { color: var(--color-primary); text-decoration: none; }

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.4rem 0.6rem;
  color: var(--color-text);
  cursor: pointer;
}

.lang-switch, .theme-toggle {
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  padding: 0.35rem 0.55rem;
  font-size: 0.85rem;
  cursor: pointer;
}
.lang-switch select { border: none; background: transparent; color: inherit; font: inherit; }

/* Hero */
.hero {
  padding: 3.5rem 0 2.5rem;
  text-align: center;
}
.hero-avatar {
  width: 132px;
  height: 132px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 1.25rem;
  box-shadow: var(--shadow-md);
  border: 3px solid var(--color-surface);
}
.hero h1 {
  margin: 0 0 0.4rem;
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  letter-spacing: -0.02em;
}
.hero p.tagline {
  margin: 0 auto;
  max-width: 640px;
  color: var(--color-text-muted);
  font-size: 1.05rem;
}
.hero-cta {
  margin-top: 1.5rem;
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.92rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.05s ease, background-color 0.15s ease, border-color 0.15s ease;
}
.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: var(--color-primary-hover); }
.btn-outline { background: transparent; border-color: var(--color-border); color: var(--color-text); }
.btn-outline:hover { border-color: var(--color-primary); color: var(--color-primary); }
.btn-sm { padding: 0.4rem 0.75rem; font-size: 0.82rem; }
.btn-danger { background: var(--color-danger); color: #fff; }

/* Sections */
main { padding: 1rem 0 4rem; }
.section { padding: 2.75rem 0; border-top: 1px solid var(--color-border); }
.section:first-child, .section-no-border { border-top: none; }

.visually-hidden { position: absolute; left: -9999px; top: auto; }
.section-title {
  font-size: 1.5rem;
  margin: 0 0 1.75rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.section-title::after {
  content: "";
  height: 1px;
  flex: 1;
  background: var(--color-border);
}
.section-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 50%;
  background: var(--color-primary-soft);
  font-size: 1.1rem;
  flex-shrink: 0;
}
.section-header-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.75rem;
}
.section-header-row .section-title { margin-bottom: 0; }
.section-header-row .section-title::after { display: none; }

.about-lead { font-size: 1.05rem; color: var(--color-text); max-width: 760px; }

/* Timeline (experience/education) — tarjetas, no solo texto con línea */
.timeline { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 1.1rem; }
.timeline-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.15rem 1.25rem;
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}
.timeline-item:hover { box-shadow: var(--shadow-sm); transform: translateY(-1px); }
.timeline-item h3 { margin: 0 0 0.5rem; font-size: 1.02rem; line-height: 1.4; }
.timeline-at { color: var(--color-text-muted); font-weight: 500; }
.timeline-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem; margin: 0 0 0.6rem; }
.date-pill {
  display: inline-block;
  background: var(--color-primary-soft);
  color: var(--color-primary);
  font-size: 0.76rem;
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  white-space: nowrap;
}
.timeline-location { color: var(--color-text-muted); font-size: 0.8rem; }
.timeline-item p { color: var(--color-text-muted); font-size: 0.92rem; }
.timeline-item p:last-child { margin-bottom: 0; }

/* "Leer más" nativo (sin JS) para descripciones largas */
.desc-more { margin-top: -0.4rem; }
.desc-more summary {
  cursor: pointer;
  color: var(--color-primary);
  font-weight: 600;
  font-size: 0.82rem;
  list-style: none;
}
.desc-more summary::-webkit-details-marker { display: none; }
.desc-more summary::after { content: " ▾"; }
.desc-more[open] summary::after { content: " ▴"; }
.desc-more p { margin-top: 0.5rem; }

/* Tag list (skills) */
.tag-list { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.tag {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  font-size: 0.85rem;
  color: var(--color-text);
}

/* Cards grid (projects/blog) */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.5rem;
}
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}
.card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.card-img { width: 100%; aspect-ratio: 16/9; object-fit: cover; background: var(--color-surface-2); }
.card-body { padding: 1.1rem 1.15rem 1.3rem; display: flex; flex-direction: column; gap: 0.5rem; flex: 1; }
.card-body h3 { margin: 0; font-size: 1.05rem; }
.card-body p { margin: 0; color: var(--color-text-muted); font-size: 0.92rem; flex: 1; }
.card-meta { font-size: 0.78rem; color: var(--color-text-muted); }
.card-footer-links { display: flex; gap: 0.75rem; margin-top: 0.4rem; font-size: 0.85rem; font-weight: 600; }

.empty-state { color: var(--color-text-muted); font-style: italic; }

/* Certifications list */
.cert-list { display: flex; flex-direction: column; gap: 0.9rem; }
.cert-item {
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
  padding: 0.9rem 1rem; background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}
.cert-item h4 { margin: 0 0 0.15rem; font-size: 0.98rem; }
.cert-item .cert-issuer { color: var(--color-text-muted); font-size: 0.85rem; }
.cert-item .cert-date { color: var(--color-text-muted); font-size: 0.8rem; white-space: nowrap; }

/* Article / detail pages (project & blog) */
.article-header { padding: 2.5rem 0 1.5rem; text-align: center; }
.article-header h1 { font-size: clamp(1.7rem, 3.5vw, 2.3rem); margin: 0 0 0.6rem; }
.article-meta { color: var(--color-text-muted); font-size: 0.88rem; }
.article-cover { width: 100%; max-height: 420px; object-fit: cover; border-radius: var(--radius-lg); margin: 1.5rem 0; }
.article-body { max-width: 720px; margin: 0 auto; font-size: 1.02rem; }
.article-body h2 { margin-top: 2rem; }
.article-body pre { background: var(--color-surface); padding: 1rem; border-radius: var(--radius-sm); overflow-x: auto; }
.article-body code { background: var(--color-surface); padding: 0.15rem 0.35rem; border-radius: 4px; font-size: 0.9em; }
.article-body pre code { background: none; padding: 0; }
.article-body img { border-radius: var(--radius-md); margin: 1.25rem 0; }
.article-gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px,1fr)); gap: 0.75rem; max-width: 720px; margin: 1.5rem auto; }
.article-gallery img { aspect-ratio: 4/3; object-fit: cover; border-radius: var(--radius-sm); }
.article-links { display: flex; gap: 0.75rem; justify-content: center; margin-top: 1.5rem; flex-wrap: wrap; }

/* Forms */
.form-field { margin-bottom: 1.1rem; }
.form-field label { display: block; font-weight: 600; font-size: 0.88rem; margin-bottom: 0.35rem; }
.form-field input, .form-field textarea, .form-field select {
  width: 100%;
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-text);
  font: inherit;
}
.form-field input:focus, .form-field textarea:focus, .form-field select:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 1px;
}
.form-hint { font-size: 0.78rem; color: var(--color-text-muted); margin-top: 0.3rem; }
.form-error { color: var(--color-danger); font-size: 0.85rem; margin-top: 0.3rem; }

.alert { padding: 0.85rem 1rem; border-radius: var(--radius-sm); margin-bottom: 1.25rem; font-size: 0.92rem; }
.alert-success { background: #ecfdf5; color: #065f46; border: 1px solid #a7f3d0; }
.alert-error { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }
:root[data-theme="dark"] .alert-success, :root:not([data-theme="light"]) .alert-success { background: #052e21; color: #6ee7b7; border-color: #0f5132; }
:root[data-theme="dark"] .alert-error, :root:not([data-theme="light"]) .alert-error { background: #2e0a0a; color: #fca5a5; border-color: #7f1d1d; }

.contact-wrap { max-width: 560px; margin: 0 auto; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 2.25rem 0;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  text-align: center;
}
.site-footer a { color: var(--color-text-muted); font-weight: 600; }
.site-footer .footer-links { margin-top: 0.5rem; display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; }

/* 404 */
.not-found { text-align: center; padding: 4rem 0; }
.not-found h1 { font-size: 2.5rem; }

@media (max-width: 720px) {
  .main-nav { display: none; width: 100%; flex-direction: column; align-items: flex-start; gap: 0.25rem; }
  .main-nav.open { display: flex; }
  .site-header .container { flex-wrap: wrap; }
  .nav-toggle { display: inline-flex; }
}