:root {
  --color-fondo: #0f0f0f;
  --color-superficie: #1a1a1a;
  --color-borde: #2a2a2a;
  --color-texto: #e8e8e8;
  --color-texto-suave: #888888;
  --color-acento: #2563eb;
  --color-acento-hover: #1d4ed8;
  --fuente: 'Inter', Arial, sans-serif;
}

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

body {
  background-color: var(--color-fondo);
  color: var(--color-texto);
  font-family: var(--fuente);
  font-size: 16px;
  line-height: 1.6;
}

/* SCROLLBAR */
* {
  scrollbar-width: thin;
  scrollbar-color: #333333 transparent;
}

::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background-color: #333333;
  border-radius: 999px;
}

::-webkit-scrollbar-thumb:hover {
  background-color: #444444;
}

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

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

/* SIDEBAR FIJO */
#sidebar {
  position: fixed;
  top: 56px;
  left: 0;
  width: 240px;
  height: calc(100vh - 56px);
  overflow-y: auto;
  border-right: 1px solid var(--color-borde);
  padding: 20px 16px;
  background-color: var(--color-fondo);
}

.search-box input {
  width: 100%;
  background-color: var(--color-superficie);
  border: 1px solid var(--color-borde);
  border-radius: 6px;
  padding: 8px 12px;
  font-size: 13px;
  color: var(--color-texto);
  outline: none;
  margin-bottom: 16px;
}

.search-box input::placeholder { color: var(--color-texto-suave); }
.search-box input:focus { border-color: var(--color-acento); }

.sidebar-inicio {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-texto-suave);
  padding: 4px 0;
  margin-bottom: 12px;
}

.sidebar-inicio:hover,
.sidebar-inicio.activo { color: var(--color-texto); }

.sidebar-cat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  padding: 5px 0;
  margin-top: 4px;
}

.sidebar-cat-nombre {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-texto-suave);
}

.sidebar-cat-chevron {
  font-size: 10px;
  color: var(--color-texto-suave);
  transition: transform 0.15s;
}

.sidebar-cat-header.expandido .sidebar-cat-chevron {
  transform: rotate(90deg);
}

.sidebar-cat-posts {
  display: none;
  flex-direction: column;
  margin-bottom: 4px;
}

.sidebar-cat-posts.visible { display: flex; }

.sidebar-post-link {
  display: block;
  font-size: 13px;
  color: var(--color-texto-suave);
  padding: 4px 0 4px 10px;
  border-left: 2px solid transparent;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-post-link:hover { color: var(--color-texto); }

.sidebar-post-link.activo {
  color: var(--color-texto);
  border-left-color: var(--color-acento);
}

/* ─── OS TOGGLE ──────────────────────────────────────────────────────────── */
#os-toggle {
  display: flex;
  gap: 6px;
  margin-bottom: 16px;
}

.topnav-os-toggle {
  display: none;
  gap: 6px;
}

.os-btn {
  flex: 1;
  padding: 5px 10px;
  font-size: 12px;
  font-weight: 500;
  background-color: var(--color-superficie);
  border: 1px solid var(--color-borde);
  border-radius: 6px;
  color: var(--color-texto-suave);
  cursor: pointer;
}

.os-btn.activo {
  background-color: var(--color-superficie);
  border-color: var(--color-texto-suave);
  color: var(--color-texto);
}

/* ─── RESPONSIVE ──────────────────────────────────────────────────────────── */
@media (max-width: 900px) {
  .menu-btn { display: block; }

  #sidebar {
    transform: translateX(-100%);
    transition: transform 0.2s ease;
    z-index: 100;
  }

  #sidebar.abierto { transform: translateX(0); }

  .topnav-links a:not(:first-child) { display: none; }

  #os-toggle { display: none; }

  .topnav-os-toggle { display: flex; }
}

/* OVERLAY MÓVIL */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 99;
}

.sidebar-overlay.visible { display: block; }

/* HAMBURGUESA */
.menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-texto);
  padding: 4px;
  margin-right: 12px;
}

/* NAV */
nav.topnav {
  background-color: var(--color-superficie);
  border-bottom: 1px solid var(--color-borde);
  padding: 0 32px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

.topnav-logo {
  font-weight: 600;
  font-size: 15px;
  color: var(--color-texto);
}

.topnav-links {
  display: flex;
  gap: 24px;
  font-size: 13px;
  color: var(--color-texto-suave);
}

.topnav-links a {
  color: var(--color-texto-suave);
}

.topnav-links a:hover {
  color: var(--color-texto);
}