/* ===========================================================================
   CIAO CIELO — Portal de Proyecto
   Brand: celeste (#78b0d9), Bree Serif + Inter + Caveat, warm off-white bg.
   Convention follows descaro-site / kraion-site (vanilla, no build).
   =========================================================================== */

/* ----- Reset + tokens ----- */
*, *::before, *::after { box-sizing: border-box; }

:root {
  /* brand */
  --cc-celeste:       #78b0d9;
  --cc-celeste-soft:  #c8e0ee;
  --cc-celeste-deep:  #4a85b0;
  --cc-celeste-bg:    #eaf3fa;
  --cc-black:         #1d1d1b;

  /* surfaces */
  --bg:               #faf8f3;
  --bg-warm:          #f3ede0;
  --bg-card:          #ffffff;

  /* text */
  --text:             #1d1d1b;
  --text-muted:       #6b6b66;
  --text-soft:        #9a9a92;

  /* lines */
  --border:           #e5e0d4;
  --border-strong:    #c8c2b0;

  /* type */
  --font-display:     'Bree Serif', Georgia, serif;
  --font-body:        'Inter', system-ui, -apple-system, sans-serif;
  --font-script:      'Caveat', 'Bradley Hand', cursive;

  /* layout */
  --sidebar-w:        300px;
  --header-h:         72px;
  --max-content:      820px;

  /* motion */
  --ease:             cubic-bezier(0.22, 1, 0.36, 1);
}

html, body {
  margin: 0;
  padding: 0;
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--cc-celeste-deep); text-decoration: none; transition: color .2s var(--ease); }
a:hover { color: var(--cc-celeste); }

/* ----- Ambient background ----- */
.ambience {
  position: fixed; inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}
.ambience__sky {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 1200px 700px at 80% -10%, rgba(120, 176, 217, 0.25), transparent 60%),
    radial-gradient(ellipse 900px 500px at 20% 110%, rgba(243, 237, 224, 0.6), transparent 70%),
    var(--bg);
}
.ambience__cloud {
  position: absolute;
  width: 600px; height: 200px;
  background: radial-gradient(ellipse, rgba(255,255,255,0.7), transparent 70%);
  filter: blur(40px);
  opacity: 0.6;
  animation: drift 60s var(--ease) infinite;
}
.ambience__cloud--a { top: 8%;  left: -10%; animation-delay: 0s; }
.ambience__cloud--b { top: 60%; right: -10%; animation-delay: -30s; }
@keyframes drift {
  0%, 100% { transform: translateX(0) translateY(0); }
  50%      { transform: translateX(80px) translateY(-20px); }
}
.ambience__grain {
  position: absolute; inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E");
  opacity: 0.04;
  mix-blend-mode: multiply;
}

/* ----- Header ----- */
.site-header {
  position: sticky; top: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(250, 248, 243, 0.85);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--border);
}
.site-header__inner {
  max-width: 1400px;
  height: 100%;
  margin: 0 auto;
  padding: 0 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  color: inherit;
  text-decoration: none;
  flex-shrink: 0;
}
.brand-logo {
  width: 44px; height: 44px;
  object-fit: contain;
  flex-shrink: 0;
}
.brand-meta {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}
.brand-name {
  font-family: var(--font-display);
  font-size: 20px;
  letter-spacing: 0.01em;
  color: var(--cc-black);
}
.brand-sub {
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

.header-tools { display: flex; align-items: center; gap: 16px; }
.lang-toggle {
  display: flex;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px;
  gap: 2px;
}
.lang-toggle__btn {
  border: 0;
  background: transparent;
  padding: 6px 12px;
  border-radius: 999px;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  cursor: pointer;
  transition: all .2s var(--ease);
  display: inline-flex; align-items: center; gap: 6px;
}
.lang-toggle__btn.is-active {
  background: var(--cc-celeste);
  color: white;
  box-shadow: 0 1px 4px rgba(120,176,217,0.4);
}
.lang-toggle__btn:hover:not(.is-active) {
  background: var(--cc-celeste-bg);
  color: var(--cc-celeste-deep);
}
.lang-flag { font-size: 14px; }

.nav-toggle {
  display: none;
  width: 40px; height: 40px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-card);
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 4px;
}
.nav-toggle span {
  width: 18px; height: 2px;
  background: var(--cc-black);
  border-radius: 2px;
}

/* ----- Layout ----- */
.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  max-width: 1400px;
  margin: 0 auto;
  min-height: calc(100vh - var(--header-h));
}

/* ----- Sidebar ----- */
.sidebar {
  border-right: 1px solid var(--border);
  padding: 32px 24px 32px 28px;
  position: sticky;
  top: var(--header-h);
  align-self: start;
  height: calc(100vh - var(--header-h));
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}
.sidebar__nav { flex: 1; }

.nav-group {
  margin-bottom: 28px;
}
.nav-group__label {
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-soft);
  margin: 0 0 10px;
  padding: 0 8px;
}
.nav-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 14px;
  color: var(--text);
  margin: 1px 0;
  transition: all .15s var(--ease);
  position: relative;
}
.nav-link:hover {
  background: var(--cc-celeste-bg);
  color: var(--cc-celeste-deep);
}
.nav-link.is-active {
  background: var(--cc-celeste);
  color: white;
  font-weight: 500;
}
.nav-link.is-active::before {
  content: '';
  position: absolute;
  left: -28px; top: 50%;
  width: 3px; height: 60%;
  background: var(--cc-celeste);
  border-radius: 0 3px 3px 0;
  transform: translateY(-50%);
}
.nav-link__lang-hint {
  margin-left: auto;
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.08em;
  padding: 2px 6px;
  border-radius: 999px;
  background: rgba(154, 154, 146, 0.15);
  color: var(--text-soft);
  opacity: 0.7;
}
.nav-link.is-active .nav-link__lang-hint {
  background: rgba(255,255,255,0.25);
  color: white;
  opacity: 1;
}

.sidebar__footer {
  padding-top: 24px;
  border-top: 1px solid var(--border);
  margin-top: 16px;
}
.sidebar__pulse {
  font-size: 12px;
  color: var(--text-muted);
  margin: 0 0 12px;
  padding: 0 8px;
  line-height: 1.5;
}
.sidebar__credit {
  font-size: 13px;
  color: var(--text-muted);
  margin: 0;
  padding: 0 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.heart { font-size: 14px; }

/* ----- Content area ----- */
.content {
  padding: 56px 56px 80px;
  min-width: 0;
}

.markdown-body {
  max-width: var(--max-content);
  margin: 0 auto;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
}

.markdown-body h1 {
  font-family: var(--font-display);
  font-size: 42px;
  font-weight: 400;
  line-height: 1.15;
  margin: 0 0 12px;
  color: var(--cc-black);
  letter-spacing: -0.005em;
}
.markdown-body h1 + p,
.markdown-body h1 + blockquote { margin-top: 0; }

.markdown-body h2 {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 400;
  margin: 56px 0 14px;
  color: var(--cc-black);
  letter-spacing: -0.003em;
  border-bottom: 1px solid var(--border);
  padding-bottom: 10px;
}
.markdown-body h3 {
  font-family: var(--font-body);
  font-size: 18px;
  font-weight: 700;
  margin: 32px 0 8px;
  color: var(--cc-celeste-deep);
  letter-spacing: 0.005em;
}
.markdown-body h4 {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  margin: 24px 0 6px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.markdown-body p {
  margin: 0 0 16px;
}

.markdown-body strong { font-weight: 700; color: var(--cc-black); }
.markdown-body em     { font-style: italic; color: var(--cc-celeste-deep); }

.markdown-body blockquote {
  margin: 24px 0;
  padding: 18px 24px;
  border-left: 3px solid var(--cc-celeste);
  background: var(--cc-celeste-bg);
  border-radius: 0 12px 12px 0;
  color: var(--text);
  font-size: 15.5px;
}
.markdown-body blockquote p:last-child { margin: 0; }

.markdown-body ul, .markdown-body ol {
  padding-left: 28px;
  margin: 0 0 16px;
}
.markdown-body li {
  margin: 4px 0;
}
.markdown-body li::marker { color: var(--cc-celeste); }

.markdown-body code {
  font-family: 'JetBrains Mono', Menlo, monospace;
  font-size: 0.9em;
  background: var(--bg-warm);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--cc-celeste-deep);
}
.markdown-body pre {
  background: var(--cc-black);
  color: #f5f5f0;
  padding: 18px 22px;
  border-radius: 10px;
  overflow-x: auto;
  font-size: 13.5px;
  line-height: 1.6;
  margin: 20px 0;
}
.markdown-body pre code {
  background: transparent;
  color: inherit;
  padding: 0;
}

.markdown-body hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 40px 0;
}

.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 14px;
}
.markdown-body th, .markdown-body td {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
}
.markdown-body th {
  font-weight: 700;
  background: var(--bg-warm);
  color: var(--cc-black);
}
.markdown-body tr:hover td { background: rgba(120, 176, 217, 0.04); }

.markdown-body img {
  max-width: 100%;
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.08);
  margin: 16px 0;
}

/* ----- Lang fallback banner ----- */
.lang-banner {
  background: linear-gradient(90deg, var(--cc-celeste-bg), transparent);
  border-left: 3px solid var(--cc-celeste);
  padding: 12px 18px;
  margin: 0 0 24px;
  border-radius: 0 8px 8px 0;
  font-size: 13.5px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 10px;
}
.lang-banner strong { color: var(--cc-celeste-deep); }

/* ----- Loading ----- */
.loading {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-soft);
  font-size: 14px;
  padding: 40px 0;
}
.loading__pulse {
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--cc-celeste);
  animation: pulse 1.6s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 0.3; transform: scale(0.85); }
  50%      { opacity: 1;    transform: scale(1.1); }
}

/* ----- Content footer ----- */
.content-footer {
  max-width: var(--max-content);
  margin: 80px auto 0;
  padding: 32px 0 0;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-muted);
}
.content-footer__line {
  font-size: 15px;
  margin: 0 0 4px;
}
.caveat {
  font-family: var(--font-script);
  font-size: 24px;
  color: var(--cc-celeste-deep);
  font-weight: 700;
  vertical-align: middle;
}
.dot { margin: 0 8px; color: var(--text-soft); }
.content-footer__credit {
  font-size: 12px;
  margin: 0;
  letter-spacing: 0.02em;
  line-height: 1.55;
}
.footer__kraion {
  color: var(--cc-celeste-deep);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px dashed rgba(74, 133, 176, 0.35);
  transition: color .2s, border-color .2s;
}
.footer__kraion:hover {
  color: var(--cc-celeste);
  border-bottom-color: var(--cc-celeste);
}
.footer__heart-link {
  text-decoration: none;
  display: inline-block;
  transition: transform .25s cubic-bezier(0.34, 1.56, 0.64, 1);
  vertical-align: -1px;
}
.footer__heart-link:hover { transform: scale(1.25); }

/* ----- Responsive ----- */
@media (max-width: 900px) {
  .nav-toggle { display: flex; }
  .layout { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed;
    top: var(--header-h);
    left: 0;
    width: 280px;
    height: calc(100vh - var(--header-h));
    background: var(--bg);
    border-right: 1px solid var(--border);
    transform: translateX(-100%);
    transition: transform .3s var(--ease);
    z-index: 50;
    box-shadow: 0 0 24px rgba(0,0,0,0.1);
  }
  .sidebar.is-open { transform: translateX(0); }
  .content { padding: 32px 24px 60px; }
  .markdown-body h1 { font-size: 32px; }
  .markdown-body h2 { font-size: 22px; }
  .brand-meta { display: none; }
}

@media (max-width: 480px) {
  .site-header__inner { padding: 0 16px; }
  .lang-toggle__btn { padding: 5px 9px; font-size: 12px; }
  .lang-toggle__btn span:not(.lang-flag) { display: none; }
  .content { padding: 24px 18px 50px; }
  .markdown-body h1 { font-size: 28px; }
}