/* ============================================================
   Security+ SY0-701 Study Hub — hoja de estilo compartida
   Estilo cyber oscuro, consistente con el portfolio.
   ============================================================ */

:root {
  --bg: #0a0a0f;
  --bg-alt: #0e0e15;
  --bg-card: #12121c;
  --border: #1f1f2e;
  --text: #e0e0e0;
  --text-strong: #ffffff;
  --muted: #9a9ab0;
  --accent: #00ffcc;
  --accent-2: #ff0055;
  --accent-soft: rgba(0, 255, 204, .10);
  --accent-2-soft: rgba(255, 0, 85, .10);
  --accent-ink: #032420;
  --warn: #ffb800;
  --ok: #2ee6a8;
  --mono: "JetBrains Mono", "Fira Code", Consolas, monospace;
  --sans: "Inter", system-ui, -apple-system, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
}

/* ---------- Navegación superior ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 10, 15, .95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.topbar-inner {
  max-width: 1150px;
  margin: 0 auto;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.logo-mark {
  font-family: var(--mono);
  font-weight: 700;
  color: var(--accent-ink);
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  border-radius: 6px;
  padding: 3px 8px;
  font-size: 14px;
  flex-shrink: 0;
}
.brand { font-size: 15px; flex-shrink: 0; }
.brand b { color: var(--text-strong); }
.brand span { color: var(--accent); }
.nav {
  display: flex;
  gap: 3px;
  flex-wrap: wrap;
  margin-left: auto;
}
.nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 12.5px;
  padding: 6px 10px;
  border-radius: 8px;
  border: 1px solid transparent;
  transition: .2s;
  white-space: nowrap;
}
.nav a:hover { color: var(--text-strong); border-color: var(--border); }
.nav a.active {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-soft);
}

/* ---------- Hero ---------- */
.hero {
  text-align: center;
  padding: 48px 16px 32px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(500px 250px at 20% 0%, var(--accent-soft), transparent 70%),
    radial-gradient(500px 250px at 80% 0%, var(--accent-2-soft), transparent 70%);
  pointer-events: none;
}
.hero h1 {
  font-size: clamp(26px, 5vw, 46px);
  color: var(--text-strong);
  letter-spacing: -.5px;
}
.hero h1 .grad { background: linear-gradient(90deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero .sub { color: var(--muted); max-width: 720px; margin: 12px auto 0; font-size: 15px; }
.hero .meta { margin-top: 18px; display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; }

/* ---------- Contenedor principal ---------- */
.container { max-width: 1150px; margin: 0 auto; padding: 0 16px; }
.wrap { max-width: 900px; margin: 0 auto; }

/* ---------- Tarjetas / grid ---------- */
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; margin: 22px 0; }
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  transition: transform .2s, border-color .2s;
}
.card:hover { transform: translateY(-3px); border-color: var(--accent); }
.card h3 { color: var(--text-strong); font-size: 16px; margin-bottom: 6px; }
.card h3 .num { color: var(--accent); font-family: var(--mono); margin-right: 6px; }
.card p { color: var(--muted); font-size: 14px; }
.card .tag {
  display: inline-block;
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid rgba(0,255,204,.3);
  padding: 3px 10px;
  border-radius: 99px;
}
.card .tag.warn { color: var(--warn); background: rgba(255,184,0,.08); border-color: rgba(255,184,0,.3); }

/* ---------- Secciones de contenido ---------- */
section.block { padding: 32px 0; border-top: 1px solid var(--border); }
.block-title {
  font-size: clamp(20px, 3.5vw, 30px);
  color: var(--text-strong);
  margin-bottom: 6px;
  letter-spacing: -.3px;
}
.block-sub { color: var(--muted); margin-bottom: 18px; }
h3.sub { color: var(--accent); font-size: 18px; margin: 24px 0 10px; letter-spacing: .2px; }
h4.mini { color: var(--text-strong); font-size: 15px; margin: 18px 0 6px; }

/* ---------- Tablas ---------- */
.table-wrap { overflow-x: auto; margin: 14px 0; border: 1px solid var(--border); border-radius: 12px; -webkit-overflow-scrolling: touch; }
table { width: 100%; border-collapse: collapse; background: var(--bg-card); font-size: 14px; min-width: 480px; }
th {
  text-align: left;
  padding: 10px 12px;
  color: var(--accent);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .5px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-alt);
  font-family: var(--mono);
}
td { padding: 10px 12px; border-bottom: 1px solid var(--border); color: var(--text); vertical-align: top; }
tr:last-child td { border-bottom: none; }
tbody tr:hover { background: rgba(255,255,255,.02); }

/* ---------- Cajas especiales ---------- */
.note, .tip, .warnbox, .exam {
  border-radius: 12px;
  padding: 14px 16px;
  margin: 16px 0;
  font-size: 14px;
  border-left: 4px solid;
}
.note { background: var(--accent-soft); border-color: var(--accent); }
.tip { background: var(--accent-2-soft); border-color: var(--accent-2); }
.warnbox { background: rgba(255,184,0,.07); border-color: var(--warn); }
.exam { background: rgba(150,110,255,.08); border-color: #966eff; }
.note b, .tip b, .warnbox b, .exam b { color: var(--text-strong); }
.note .ic, .tip .ic, .warnbox .ic, .exam .ic { font-family: var(--mono); font-size: 12px; }

/* ---------- Listas ---------- */
ul.clean, ol.clean { margin: 8px 0 8px 20px; }
li { margin: 5px 0; }
li b, p b { color: var(--text-strong); font-weight: 600; }
code {
  font-family: var(--mono);
  font-size: .85em;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  color: var(--accent);
  padding: 1px 5px;
  border-radius: 6px;
}
.kbd {
  font-family: var(--mono);
  font-size: 11px;
  border: 1px solid var(--border);
  border-bottom-width: 3px;
  border-radius: 6px;
  padding: 2px 6px;
  background: var(--bg-alt);
  color: var(--text-strong);
}

/* ---------- Chequeos (checklists) ---------- */
.check { list-style: none; margin: 8px 0; }
.check li { padding-left: 28px; position: relative; margin: 8px 0; font-size: 14.5px; }
.check li::before {
  content: "▹";
  position: absolute;
  left: 6px;
  color: var(--accent);
  font-weight: 700;
}

/* ---------- Timeline plan de estudio ---------- */
.timeline { position: relative; margin: 24px 0 8px; padding-left: 26px; }
.timeline::before { content: ""; position: absolute; left: 8px; top: 4px; bottom: 4px; width: 2px; background: linear-gradient(var(--accent), var(--accent-2)); opacity: .4; }
.tl-item { position: relative; margin-bottom: 16px; }
.tl-item::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
}
.tl-item.done::before { background: var(--ok); box-shadow: 0 0 10px var(--ok); }
.tl-day {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent-2);
  letter-spacing: .7px;
}
.tl-item h4 { color: var(--text-strong); font-size: 15px; margin: 2px 0 4px; }
.tl-item p { color: var(--muted); font-size: 13.5px; }

/* ---------- Acrónimos ---------- */
.acro { display: inline-block; }
.acro-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 8px; margin: 14px 0; }
.acro-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 9px 12px;
  font-size: 13px;
}
.acro-item b { font-family: var(--mono); color: var(--accent); display: block; font-size: 12.5px; }
.acro-item span { color: var(--muted); }
.acro-item span em { color: var(--text); font-style: normal; }

/* ---------- Flashcards ---------- */
.flash-wrap { display: flex; flex-direction: column; align-items: center; gap: 16px; padding: 8px 0 24px; }
.flash-card {
  width: 100%;
  max-width: 600px;
  min-height: 200px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px 20px;
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 12px;
  cursor: pointer;
  user-select: none;
  transition: border-color .2s;
  position: relative;
}
.flash-card:hover { border-color: var(--accent); }
.flash-card .fl-cat { font-family: var(--mono); font-size: 11px; color: var(--accent-2); letter-spacing: 1px; text-transform: uppercase; }
.flash-card .fl-q { font-size: 18px; color: var(--text-strong); font-weight: 600; }
.flash-card .fl-a { font-size: 15px; color: var(--accent); display: none; }
.flash-card.flipped { border-color: var(--accent); background: linear-gradient(160deg, var(--bg-card), rgba(0,255,204,.05)); }
.flash-card.flipped .fl-a { display: block; }
.flash-card .hint { position: absolute; bottom: 12px; width: 100%; left: 0; color: var(--muted); font-size: 11.5px; }
.flash-actions { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; }
.btn {
  font-family: var(--sans);
  font-size: 13.5px;
  font-weight: 600;
  padding: 9px 18px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-alt);
  color: var(--text-strong);
  cursor: pointer;
  transition: .2s;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn.primary { background: linear-gradient(90deg, var(--accent), var(--accent-2)); color: var(--accent-ink); border: none; }
.btn.primary:hover { filter: brightness(1.1); color: #00100c; }
.btn.ok { background: rgba(46,230,168,.12); border-color: var(--ok); color: var(--ok); }
.btn.no { background: var(--accent-2-soft); border-color: var(--accent-2); color: var(--accent-2); }
.counter { font-family: var(--mono); font-size: 12.5px; color: var(--muted); }

/* ---------- Breadcrumb y pie ---------- */
.crumb { font-family: var(--mono); font-size: 12px; color: var(--muted); padding: 14px 0 0; }
.crumb a { color: var(--accent); text-decoration: none; }
.crumb a:hover { text-decoration: underline; }
.footer { border-top: 1px solid var(--border); padding: 24px 16px; text-align: center; color: var(--muted); font-size: 13px; margin-top: 32px; }
.footer b { color: var(--text-strong); }

/* ---------- Pills / badges ---------- */
.pill {
  display: inline-block;
  font-family: var(--mono);
  font-size: 11px;
  padding: 4px 10px;
  border-radius: 99px;
  border: 1px solid var(--border);
  color: var(--muted);
  background: var(--bg-alt);
}
.pill.grad { border: none; background: linear-gradient(90deg, var(--accent), var(--accent-2)); color: var(--accent-ink); font-weight: 700; }

/* ---------- Utilidades ---------- */
.muted { color: var(--muted); }
.small { font-size: 13px; }
.mt { margin-top: 16px; }
.center { text-align: center; }
.accent { color: var(--accent); }
.strong { color: var(--text-strong); }

/* ====================================================================
   RESPONSIVE — Mobile first
   ==================================================================== */
@media (max-width: 900px) {
  .topbar-inner { padding: 8px 12px; gap: 8px; }
  .nav { margin-left: 0; width: 100%; justify-content: flex-start; }
  .nav a { font-size: 12px; padding: 5px 8px; }
  .hero { padding: 36px 12px 24px; }
  .hero h1 { font-size: clamp(22px, 6vw, 34px); }
  .hero .sub { font-size: 14px; }
  .hero .meta { gap: 6px; }
  .block-title { font-size: clamp(18px, 4vw, 24px); }
  .grid { grid-template-columns: 1fr; gap: 12px; }
  .table-wrap { margin: 10px 0; }
  table { min-width: 400px; font-size: 13px; }
  th, td { padding: 8px 10px; }
  .note, .tip, .warnbox, .exam { padding: 12px 14px; font-size: 13px; }
  .container { padding: 0 12px; }
  .wrap { padding: 0; }
  .flash-card { min-height: 180px; padding: 22px 16px; }
  .flash-card .fl-q { font-size: 16px; }
  .flash-card .fl-a { font-size: 14px; }
  .flash-card .fl-cat { font-size: 10px; }
  .acro-grid { grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); }
}

@media (max-width: 520px) {
  .topbar-inner { padding: 6px 10px; gap: 4px; }
  .brand { font-size: 13px; }
  .logo-mark { font-size: 12px; padding: 2px 6px; }
  .nav { gap: 2px; }
  .nav a { font-size: 11px; padding: 4px 6px; }
  .hero { padding: 28px 10px 20px; }
  .hero h1 { font-size: clamp(20px, 7vw, 26px); }
  .hero .sub { font-size: 13px; }
  .hero .meta .pill { font-size: 10px; padding: 3px 8px; }
  .block-title { font-size: clamp(17px, 5vw, 20px); }
  .card { padding: 16px; }
  .card h3 { font-size: 15px; }
  .card p { font-size: 13px; }
  table { min-width: 300px; font-size: 12px; }
  th, td { padding: 6px 8px; }
  th { font-size: 10px; }
  .btn { font-size: 12.5px; padding: 8px 14px; }
  .flash-card { min-height: 160px; padding: 18px 14px; }
  .flash-card .fl-q { font-size: 14px; }
  .flash-card .fl-a { font-size: 13px; }
  .tl-item h4 { font-size: 14px; }
  .tl-item p { font-size: 12.5px; }
  .check li { font-size: 13px; }
  .crumb { font-size: 11px; }
  .footer { font-size: 12px; }
}