/* ===========================
   LIBROS.ORG.ES — Global CSS
   =========================== */

@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;600;800&family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  --primary: #4318ff;
  --primary-light: #868cff;
  --secondary: #01b574;
  --accent: #ffb547;
  --danger: #e53e3e;
  --bg: #ffffff;
  --bg-secondary: #f4f7fe;
  --text: #4a5568;
  --heading: #1a202c;
  --card-bg: rgba(255,255,255,0.85);
  --card-border: rgba(255,255,255,0.5);
  --shadow: rgba(112,144,176,0.15);
  --nav-h: 72px;
  --radius: 20px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}

/* Animated background blobs */
body::before, body::after {
  content:''; position:fixed; border-radius:50%; z-index:-1;
  filter:blur(120px); opacity:0.4;
  animation: blob 20s infinite alternate ease-in-out;
  pointer-events: none;
}
body::before {
  width:600px; height:600px;
  background: linear-gradient(135deg, #4318ff, #868cff);
  top:-150px; left:-200px;
}
body::after {
  width:500px; height:500px;
  background: linear-gradient(135deg, #01b574, #34d399);
  top:40%; right:-150px; animation-duration:25s; animation-direction:alternate-reverse;
}
@keyframes blob {
  0%   { transform: translate(0,0) scale(1); }
  50%  { transform: translate(40px,80px) scale(1.08); }
  100% { transform: translate(-40px,40px) scale(0.93); }
}

h1,h2,h3,h4 { font-family:'Outfit',sans-serif; color:var(--heading); }
a { text-decoration:none; color:var(--primary); transition:color .2s; }

/* ===========================
   NAVBAR — No hamburger
   =========================== */
.navbar {
  position: fixed; top:0; left:0; width:100%; z-index:1000;
  display: flex; align-items: center;
  background: rgba(255,255,255,0.82);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255,255,255,0.4);
  box-shadow: 0 4px 30px rgba(0,0,0,0.06);
  height: var(--nav-h);
  padding: 0 4%;
  gap: 1.5rem;
}

.logo {
  font-family:'Outfit',sans-serif; font-weight:800;
  font-size:1.55rem; color:var(--heading);
  letter-spacing:-0.5px; flex-shrink:0;
  white-space: nowrap;
}
.logo span { color:var(--primary); }

/* Nav menu — horizontal, scrollable on mobile */
.nav-menu {
  display: flex; list-style:none; gap:0;
  overflow-x: auto; overflow-y: visible;
  scrollbar-width: none; -ms-overflow-style: none;
  flex:1;
}
.nav-menu::-webkit-scrollbar { display:none; }

.nav-item { position:static; flex-shrink:0; }

.nav-link {
  display: block;
  padding: 0 1rem;
  height: var(--nav-h);
  line-height: var(--nav-h);
  font-weight: 600; font-size:.95rem;
  color: var(--text); white-space:nowrap;
  position: relative;
  transition: color .2s;
}
.nav-link::after {
  content:''; position:absolute; bottom:0; left:1rem; right:1rem;
  height:3px; background:linear-gradient(90deg,var(--primary),var(--secondary));
  border-radius:2px; transform:scaleX(0); transform-origin:left; transition:.3s ease;
}
.nav-item:hover .nav-link,
.nav-item:focus-within .nav-link { color:var(--primary); }
.nav-item:hover .nav-link::after,
.nav-item:focus-within .nav-link::after { transform:scaleX(1); }

/* Dropdown — PC (fixed/absolute) and Mobile (static accordion) */
.dropdown {
  display:none;
  position: absolute;
  top: 100%;
  left: 0;
  background:rgba(255,255,255,0.97);
  backdrop-filter:blur(20px);
  -webkit-backdrop-filter:blur(20px);
  border:1px solid rgba(67,24,255,0.1);
  border-top: none;
  border-radius: 0 0 var(--radius) var(--radius);
  box-shadow:0 20px 50px rgba(0,0,0,0.12);
  min-width:220px; list-style:none;
  padding:.6rem 0;
  animation: dropDown .18s ease;
  z-index:1001;
}
.dropdown.is-open { display:block; }
@keyframes dropDown {
  from { opacity:0; transform:translateY(-8px); }
  to   { opacity:1; transform:translateY(0); }
}

.dropdown li a {
  display:block; padding:.7rem 1.3rem;
  font-size:.9rem; font-weight:500; color:var(--text);
  transition: all .15s;
  border-left: 3px solid transparent;
}
.dropdown li a:hover {
  color:var(--primary); background:rgba(67,24,255,0.04);
  border-left-color:var(--primary);
  padding-left:1.6rem;
}

/* --- GLOBAL MENU (Hamburger always visible) --- */
.burger { display:flex; cursor:pointer; flex-direction:column; gap:8px; z-index:1002; margin-left:auto; }
.burger div { width:35px; height:4px; background:var(--heading); border-radius:4px; transition:.3s; }
.burger.toggle .line1 { transform:rotate(-45deg) translate(-8px,8px); }
.burger.toggle .line2 { opacity:0; }
.burger.toggle .line3 { transform:rotate(45deg) translate(-8px,-8px); }

.nav-menu {
  position:fixed; top:var(--nav-h); right:-100%; width:100%; max-width:400px; height:calc(100vh - var(--nav-h));
  background:rgba(255,255,255,0.98); flex-direction:column; align-items:flex-start;
  padding:2rem 5%; transition:.4s ease-in-out; overflow-y:auto; overflow-x:hidden;
  box-shadow:-10px 0 30px rgba(0,0,0,0.1);
}
.nav-menu.nav-active { right:0; }
.nav-item { width:100%; border-bottom:1px solid rgba(0,0,0,0.05); }
.nav-link { font-size:1.2rem; height:auto; padding:1.2rem 0; display:flex; justify-content:space-between; align-items:center; }
.nav-link::after { display:none; }

.dropdown {
  position:static; box-shadow:none; border:none; background:transparent;
  border-radius:0; padding:0 0 1rem 1.5rem; width:100%;
  animation:none;
}
.dropdown li a { padding:.8rem 1rem; font-size:1.05rem; }



/* Active nav item */
.nav-link.active { color:var(--primary); }
.nav-link.active::after { transform:scaleX(1); }

/* ===========================
   HERO
   =========================== */
.hero {
  min-height:100vh; display:flex; align-items:center;
  justify-content:center; text-align:center;
  padding: calc(var(--nav-h) + 2rem) 5% 4rem;
  position:relative;
}
.hero-small {
  min-height:42vh; padding:calc(var(--nav-h) + 1rem) 5% 3rem;
  text-align:left;
}

.hero-content { max-width:900px; z-index:2; animation:slideUp .9s cubic-bezier(.2,.8,.2,1) forwards; opacity:0; transform:translateY(35px); }

.badge {
  display:inline-block; padding:.5rem 1.2rem;
  background:linear-gradient(135deg,rgba(67,24,255,.1),rgba(1,181,116,.1));
  color:var(--primary); border:1px solid rgba(67,24,255,.2);
  border-radius:50px; font-size:.85rem; font-weight:700;
  letter-spacing:1.5px; text-transform:uppercase; margin-bottom:1.5rem;
}

.hero h1 { font-size:clamp(2.5rem,5vw,4.5rem); line-height:1.1; margin-bottom:1.5rem; letter-spacing:-2px; }

.gradient-text {
  background:linear-gradient(135deg,var(--primary),var(--secondary));
  -webkit-background-clip:text; -webkit-text-fill-color:transparent; display:inline-block;
}

.hero p { font-size:clamp(1rem,2vw,1.25rem); color:var(--text); max-width:750px; margin:0 auto 2.5rem; }

.cta-button {
  display:inline-block; padding:1rem 2.5rem;
  background:linear-gradient(135deg,var(--primary),#6841ff);
  color:#fff; font-size:1.05rem; font-weight:700;
  border-radius:50px; transition:all .3s cubic-bezier(.175,.885,.32,1.275);
  box-shadow:0 10px 25px rgba(67,24,255,.3);
}
.cta-button:hover { transform:translateY(-4px) scale(1.02); box-shadow:0 15px 35px rgba(67,24,255,.4); color:#fff; }

/* Breadcrumb */
.breadcrumb {
  display:flex; gap:.5rem; align-items:center;
  font-size:.88rem; color:#a0aec0; margin-bottom:1.2rem; flex-wrap:wrap;
}
.breadcrumb a { color:var(--primary); font-weight:500; }
.breadcrumb span { color:#cbd5e0; }

/* ===========================
   CONTAINERS & GRID
   =========================== */
.container { padding:5rem 5%; max-width:1250px; margin:0 auto; position:relative; z-index:2; }
.container-sm { max-width:1050px; margin:0 auto; padding:3rem 5%; position:relative; z-index:2; }

.section-header { text-align:center; margin-bottom:4rem; }
.section-header h2 { font-size:clamp(2rem,4vw,3rem); margin-bottom:1rem; letter-spacing:-1px; }
.section-header p { font-size:1.1rem; color:var(--text); }

.grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(300px,1fr)); gap:2rem; }
.grid-5 { display:grid; grid-template-columns:repeat(auto-fit,minmax(200px,1fr)); gap:1.5rem; }

/* ===========================
   CARDS
   =========================== */
.card {
  background:var(--card-bg); border:1px solid var(--card-border);
  border-radius:var(--radius); padding:2.5rem 2rem;
  transition:all .4s cubic-bezier(.175,.885,.32,1.275);
  backdrop-filter:blur(20px); -webkit-backdrop-filter:blur(20px);
  box-shadow:0 15px 35px var(--shadow); position:relative; overflow:hidden;
}
.card:hover { transform:translateY(-12px); box-shadow:0 25px 50px rgba(67,24,255,.15); border-color:rgba(67,24,255,.2); }
.card::before {
  content:''; position:absolute; top:0; left:0; width:100%; height:3px;
  background:linear-gradient(90deg,var(--primary),var(--secondary));
  transform:scaleX(0); transform-origin:left; transition:.4s ease;
}
.card:hover::before { transform:scaleX(1); }

.card-icon {
  font-size:2.5rem; margin-bottom:1.5rem;
  background:rgba(67,24,255,.06); width:72px; height:72px;
  display:flex; align-items:center; justify-content:center;
  border-radius:18px; box-shadow:0 8px 20px rgba(67,24,255,.1);
  transition:all .3s ease;
}
.card:hover .card-icon { transform:scale(1.1) rotate(-5deg); background:linear-gradient(135deg,var(--primary),var(--secondary)); }

.card h3 { font-size:1.35rem; margin-bottom:.8rem; color:var(--heading); }
.card p  { color:var(--text); font-size:.98rem; line-height:1.65; margin-bottom:1.2rem; }

.card-link {
  display:inline-flex; align-items:center; gap:.4rem;
  font-size:.9rem; font-weight:600; color:var(--primary);
}
.card-link::after { content:'→'; transition:transform .2s; }
.card:hover .card-link::after { transform:translateX(4px); }

.card.featured {
  grid-column:1/-1; display:flex; gap:2.5rem; align-items:center;
  background:#fff; box-shadow:0 25px 55px rgba(67,24,255,.1);
  border:1px solid rgba(67,24,255,.1);
}
@media(max-width:650px){.card.featured{flex-direction:column;gap:1.5rem;}}

.tags { display:flex; flex-wrap:wrap; gap:.6rem; }
.tags span {
  font-size:.8rem; font-weight:600; padding:.4rem 1rem;
  background:var(--bg-secondary); border-radius:50px; color:var(--primary);
}

/* ===========================
   ARTICLE PAGE LAYOUT
   =========================== */
.article-layout {
  display:grid; grid-template-columns:1fr 320px; gap:3rem; align-items:start;
  max-width:1200px; margin:0 auto; padding:2rem 5% 5rem;
  position:relative; z-index:2;
}
@media(max-width:960px){ .article-layout { grid-template-columns:1fr; } }

.article-content h2 { font-size:1.8rem; margin:2.5rem 0 1rem; color:var(--heading); letter-spacing:-.5px; }
.article-content h3 { font-size:1.35rem; margin:2rem 0 .8rem; color:var(--heading); }
.article-content p  { margin-bottom:1.3rem; font-size:1.05rem; line-height:1.8; color:var(--text); }
.article-content ul, .article-content ol { padding-left:1.5rem; margin-bottom:1.3rem; }
.article-content li { margin-bottom:.6rem; font-size:1.05rem; line-height:1.7; }
.article-content strong { color:var(--heading); }
.article-content a { color:var(--primary); font-weight:500; }
.article-content a:hover { text-decoration:underline; }

/* Warning box */
.warning-box {
  background:linear-gradient(135deg,#fff5f5,#fff0f0);
  border:1px solid rgba(229,62,62,.25); border-left:4px solid var(--danger);
  border-radius:12px; padding:1.5rem 1.8rem; margin:2rem 0;
}
.warning-box .warning-title {
  font-family:'Outfit',sans-serif; font-weight:700;
  color:var(--danger); font-size:1.05rem; margin-bottom:.6rem;
  display:flex; align-items:center; gap:.5rem;
}
.warning-box p { color:#742a2a; font-size:.97rem; margin:0; }

/* Tip box */
.tip-box {
  background:linear-gradient(135deg,rgba(1,181,116,.08),rgba(52,211,153,.05));
  border:1px solid rgba(1,181,116,.25); border-left:4px solid var(--secondary);
  border-radius:12px; padding:1.5rem 1.8rem; margin:2rem 0;
}
.tip-box .tip-title {
  font-family:'Outfit',sans-serif; font-weight:700;
  color:var(--secondary); font-size:1.05rem; margin-bottom:.6rem;
  display:flex; align-items:center; gap:.5rem;
}
.tip-box p { color:#1a4731; font-size:.97rem; margin:0; }

/* Highlight box (booktok etc) */
.highlight-box {
  background:linear-gradient(135deg,rgba(67,24,255,.06),rgba(134,140,255,.04));
  border:1px solid rgba(67,24,255,.15); border-radius:16px;
  padding:2rem; margin:2rem 0;
  position:relative; overflow:hidden;
}
.highlight-box::before {
  content:''; position:absolute; top:0; left:0; right:0; height:3px;
  background:linear-gradient(90deg,var(--primary),var(--secondary));
}
.highlight-box h3 { color:var(--primary); margin-bottom:.8rem; }
.highlight-box p { margin:0; color:var(--text); }

/* Stat strip */
.stat-strip {
  display:grid; grid-template-columns:repeat(auto-fit,minmax(140px,1fr));
  gap:1.2rem; background:var(--bg-secondary); border-radius:16px;
  padding:1.8rem; margin:2rem 0;
}
.stat { text-align:center; }
.stat-number { font-family:'Outfit',sans-serif; font-size:2rem; font-weight:800; color:var(--primary); }
.stat-label { font-size:.82rem; color:var(--text); margin-top:.2rem; }

/* ===========================
   SIDEBAR
   =========================== */
.sidebar { position:sticky; top:calc(var(--nav-h) + 1.5rem); display:flex; flex-direction:column; gap:1.5rem; }

.sidebar-box {
  background:rgba(255,255,255,0.9); border:1px solid rgba(255,255,255,0.5);
  border-radius:var(--radius); padding:1.5rem;
  backdrop-filter:blur(20px); box-shadow:0 15px 35px var(--shadow);
  position:relative; overflow:hidden;
}
.sidebar-box::before {
  content:''; position:absolute; top:0; left:0; right:0; height:3px;
  background:linear-gradient(90deg,var(--primary),var(--secondary));
}
.sidebar-box h4 { font-size:1rem; margin-bottom:1rem; color:var(--heading); }
.sidebar-box ul { list-style:none; display:flex; flex-direction:column; gap:.5rem; }
.sidebar-box ul li a {
  font-size:.88rem; color:var(--text); font-weight:500;
  display:flex; align-items:center; gap:.5rem; padding:.3rem 0;
  border-bottom:1px solid rgba(0,0,0,.04); transition:color .2s;
}
.sidebar-box ul li a:hover { color:var(--primary); }
.sidebar-box ul li a::before { content:'›'; color:var(--primary); font-weight:700; }

.cta-sidebar {
  background:linear-gradient(135deg,var(--primary),#6841ff);
  border-radius:var(--radius); padding:1.8rem; text-align:center; color:#fff;
}
.cta-sidebar h4 { color:#fff; font-size:1.05rem; margin-bottom:.7rem; }
.cta-sidebar p { font-size:.88rem; color:rgba(255,255,255,.85); margin-bottom:1.2rem; }
.cta-sidebar a {
  display:inline-block; background:#fff; color:var(--primary);
  font-weight:700; font-size:.9rem; padding:.7rem 1.4rem;
  border-radius:50px; transition:all .2s;
}
.cta-sidebar a:hover { transform:translateY(-2px); box-shadow:0 8px 20px rgba(0,0,0,.15); }

/* ===========================
   FOOTER
   =========================== */
footer {
  background:#fff; border-top:1px solid rgba(0,0,0,.06);
  padding:3rem 5%; text-align:center; position:relative; z-index:2;
}
.footer-grid {
  display:grid; grid-template-columns:repeat(auto-fit,minmax(200px,1fr));
  gap:2rem; max-width:1100px; margin:0 auto 2rem; text-align:left;
}
.footer-col h5 { font-family:'Outfit',sans-serif; font-weight:700; font-size:.95rem; margin-bottom:1rem; color:var(--heading); }
.footer-col ul { list-style:none; display:flex; flex-direction:column; gap:.5rem; }
.footer-col ul li a { font-size:.85rem; color:var(--text); transition:color .2s; }
.footer-col ul li a:hover { color:var(--primary); }
.footer-bottom { font-size:.85rem; color:#a0aec0; border-top:1px solid rgba(0,0,0,.05); padding-top:1.5rem; margin-top:1rem; }

/* ===========================
   ANIMATIONS
   =========================== */
@keyframes slideUp {
  from { opacity:0; transform:translateY(35px); }
  to   { opacity:1; transform:translateY(0); }
}

/* ===========================
   UTILITIES
   =========================== */
.mt-1 { margin-top:1rem; }
.text-center { text-align:center; }
.visually-hidden { position:absolute; width:1px; height:1px; overflow:hidden; clip:rect(0,0,0,0); }