/* ============================================================
   PaperLab — estilos compartidos (multi-página)
   Cambia colores/tipografías aquí y se actualiza todo el sitio.
   ============================================================ */
:root{
  --ink:#0b2a2a; --teal:#0d9488; --teal-d:#0a6f66; --lime:#84cc16; --amber:#f59e0b;
  --paper:#d4ece4; --card:#ffffff; --muted:#5b6b6a; --line:#b6d8ce;
  --shadow:0 6px 18px rgba(11,42,42,.12); --shadow-lg:0 20px 48px rgba(11,42,42,.18); --radius:18px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:'Inter',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--ink);background:var(--paper);line-height:1.6}
h1,h2,h3,.logo,.btn,.chip,.station-num{font-family:'Plus Jakarta Sans',system-ui,sans-serif}
a{color:inherit;text-decoration:none}
/* DOI clickeable en las referencias: hereda el color del texto (legible en claro y oscuro) y se subraya */
.doi-link{text-decoration:underline;text-underline-offset:2px;word-break:break-all;cursor:pointer}
.doi-link:hover{color:var(--teal)}
.wrap{width:100%;max-width:1900px;margin:0 auto;padding:0 clamp(20px,3vw,56px)}
.eyebrow{font-family:'Plus Jakarta Sans';font-weight:700;letter-spacing:.14em;text-transform:uppercase;font-size:.72rem;color:var(--teal)}
.center{text-align:center}

/* Header */
header{position:sticky;top:0;z-index:50;background:rgba(247,250,249,.85);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo{display:flex;align-items:center;gap:0;font-weight:800;font-size:1.25rem;color:var(--ink)}  /* gap:0 -> el nombre va junto: PaperLab, no Paper Lab */
.logo .mark{width:34px;height:34px;margin-right:10px;border-radius:10px;display:grid;place-items:center;color:#fff;font-size:1.05rem;background:linear-gradient(135deg,var(--teal),var(--lime));box-shadow:var(--shadow)}
.logo b{color:var(--teal)}
.nav-links{display:flex;align-items:center;gap:22px;font-weight:500;font-size:.95rem}
.nav-links a{cursor:pointer}
.nav-links a:hover{color:var(--teal)}
.nav-links a.active{color:var(--teal);font-weight:700}
.lock-ic{font-size:.78rem;opacity:.6}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:700;border-radius:999px;padding:11px 20px;cursor:pointer;border:0;font-size:.95rem;transition:transform .15s ease,box-shadow .15s ease;font-family:'Plus Jakarta Sans'}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:var(--amber);color:#3a2400;box-shadow:0 8px 20px rgba(245,158,11,.35)}
.btn-ghost{background:transparent;color:var(--ink);border:1.5px solid var(--line)}
.btn-ghost:hover{border-color:var(--teal);color:var(--teal)}
.btn-teal{background:var(--teal);color:#fff;box-shadow:0 8px 20px rgba(13,148,136,.3)}
.btn-sm{padding:8px 15px;font-size:.85rem}
.hamb{display:none;background:none;border:0;font-size:1.6rem;cursor:pointer;color:var(--ink)}

/* Hero (landing) */
.hero{position:relative;overflow:hidden;padding:74px 0 58px}
.hero:before{content:none}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:46px;align-items:center}
.hero h1{font-size:clamp(2.1rem,4.4vw,3.4rem);line-height:1.08;margin:.5rem 0 .8rem;font-weight:800;letter-spacing:-.02em}
.hero h1 .hl{color:var(--teal)}
.hero p.lead{font-size:1.12rem;color:var(--muted);max-width:none}
.cta-row{display:flex;flex-wrap:wrap;gap:14px;margin-top:26px}
.chips{display:flex;flex-wrap:wrap;gap:10px;margin-top:30px}
.chip{background:var(--card);border:1px solid var(--line);border-radius:999px;padding:8px 15px;font-weight:600;font-size:.85rem;display:flex;align-items:center;gap:7px;box-shadow:var(--shadow)}
.chip b{color:var(--teal)}
.hero-card{background:var(--card);border-radius:24px;box-shadow:var(--shadow-lg);padding:26px;border:1px solid var(--line);transform:rotate(-1.2deg)}
.hero-card h4{margin:0 0 4px;font-family:'Plus Jakarta Sans';font-size:.95rem}
.hero-card .ribbon{font-size:.72rem;font-weight:700;color:var(--teal);text-transform:uppercase;letter-spacing:.1em}
.mini-step{display:flex;gap:12px;align-items:flex-start;padding:11px 0;border-top:1px dashed var(--line)}
.mini-step:first-of-type{border-top:0}
.mini-step .dot{flex:0 0 26px;height:26px;border-radius:8px;background:linear-gradient(135deg,var(--teal),var(--lime));color:#fff;display:grid;place-items:center;font-weight:700;font-size:.8rem;font-family:'Plus Jakarta Sans'}
.mini-step small{color:var(--muted)}

/* Page hero (interior) */
.page-hero{position:relative;overflow:hidden;padding:52px 0 26px;text-align:center}
.page-hero:before{content:none}
.page-hero h1{font-size:clamp(1.9rem,3.8vw,2.7rem);line-height:1.1;margin:.4rem 0 .6rem;font-weight:800;letter-spacing:-.02em}
.page-hero p.lead{font-size:1.08rem;color:var(--muted);max-width:none;margin-left:auto;margin-right:auto}
.crumb{font-size:.85rem;color:var(--muted)}
.crumb a:hover{color:var(--teal)}

/* Sections */
section{padding:46px 0}
.sec-head{text-align:center;max-width:min(1150px,100%);margin:0 auto 36px}
.sec-head h2{font-size:clamp(1.5rem,3vw,2.2rem);margin:.4rem 0 .4rem;font-weight:800;letter-spacing:-.01em}
.sec-head p{color:var(--muted);margin:0}
.grid{display:flex;flex-wrap:wrap;gap:22px;justify-content:center;align-items:stretch}
.g2>*{flex:0 1 360px} .g3>*{flex:0 1 320px} .g4>*{flex:0 1 250px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}
.card.hov{transition:transform .18s ease,box-shadow .18s ease}
.card.hov:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg)}
.cards3{display:flex;flex-wrap:wrap;gap:22px;justify-content:center;align-items:stretch}
.cards3>*{flex:0 1 340px}
.vcard{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow);transition:transform .18s ease,box-shadow .18s ease}
.vcard:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg)}
.vcard .ic{width:48px;height:48px;border-radius:13px;display:grid;place-items:center;font-size:1.5rem;margin-bottom:14px;background:#eafaf6}
.vcard h3{margin:.1rem 0 .4rem;font-size:1.15rem}
.vcard p{margin:0;color:var(--muted);font-size:.96rem}
.bg-soft{background:#c6e4da}

.road{display:flex;flex-wrap:wrap;gap:18px;justify-content:center;align-items:stretch}
.road>*{flex:0 1 200px}
.station{position:relative;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:20px 18px;box-shadow:var(--shadow);transition:transform .18s ease,border-color .18s ease;cursor:pointer}
.station:hover{transform:translateY(-5px);border-color:var(--teal)}
.station-num{position:absolute;top:-14px;left:18px;width:30px;height:30px;border-radius:9px;background:var(--ink);color:#fff;display:grid;place-items:center;font-weight:800;font-size:.9rem}
.station .ic{font-size:1.7rem;margin:6px 0 8px}
.station h3{font-size:1.04rem;margin:0 0 4px}
.station p{margin:0 0 12px;color:var(--muted);font-size:.88rem}
.reto{display:inline-flex;align-items:center;gap:6px;font-weight:700;font-size:.76rem;color:var(--teal-d);background:#e7f7f3;border-radius:999px;padding:5px 11px}

.tagpill{display:inline-block;font-weight:700;font-size:.72rem;letter-spacing:.06em;text-transform:uppercase;padding:5px 11px;border-radius:999px}
.tagpill.tagpill-lg{font-size:clamp(1.4rem,2.6vw,2.1rem);letter-spacing:.02em;padding:8px 26px;margin-bottom:6px}
.t-teal{background:#e7f7f3;color:var(--teal-d)} .t-lime{background:#eef6dc;color:#5b7a10} .t-amber{background:#fdeccd;color:#9a6300}
.note{font-size:.9rem;color:var(--ink);background:#fff7e8;border-left:3px solid var(--amber);padding:12px 16px;border-radius:0 8px 8px 0;text-align:center;text-wrap:balance}
.note.teal{background:#e9f7f4;border-left-color:var(--teal)}

.capas{display:flex;flex-wrap:wrap;gap:22px;justify-content:center;align-items:stretch}
.capas>*{flex:0 1 340px}
.capa{border-radius:var(--radius);padding:24px;border:1px solid var(--line);background:var(--card);box-shadow:var(--shadow)}
.capa h3{margin:.2rem 0 .5rem;font-size:1.08rem}
.capa ul{margin:.4rem 0 0;padding-left:18px;color:var(--muted);font-size:.92rem}
.capa li{margin:5px 0}

.cta-band{background:linear-gradient(135deg,var(--teal),var(--teal-d));color:#fff;border-radius:26px;padding:46px;text-align:center;box-shadow:var(--shadow-lg)}
.cta-band h2{color:#fff;font-size:clamp(1.5rem,2.6vw,2.1rem);margin:0 0 .5rem}
.cta-band p{color:#d7f1ec;max-width:52ch;margin:0 auto 24px}

footer{padding:46px 0 30px;border-top:1px solid var(--line);color:var(--muted);font-size:.92rem;background:#fff}
.foot-grid{display:flex;justify-content:space-between;flex-wrap:wrap;gap:30px;max-width:1080px;margin:0 auto}
.foot-brand .logo{font-size:1.1rem;margin-bottom:8px}
.foot-cols{display:flex;gap:54px;flex-wrap:wrap}
.foot-cols h4{font-family:'Plus Jakarta Sans';font-size:.8rem;text-transform:uppercase;letter-spacing:.1em;color:var(--ink);margin:0 0 10px}
.foot-cols a{display:block;margin:6px 0;color:var(--muted);cursor:pointer}
.foot-cols a:hover{color:var(--teal)}
.foot-base{max-width:1080px;margin:26px auto 0;padding-top:18px;border-top:1px solid var(--line);display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}

/* Ruta detalle */
.station-full{display:grid;grid-template-columns:64px 1fr;gap:20px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px;margin-bottom:22px}
.station-full .num{width:54px;height:54px;border-radius:14px;background:linear-gradient(135deg,var(--teal),var(--lime));color:#fff;display:grid;place-items:center;font-weight:800;font-size:1.4rem;font-family:'Plus Jakarta Sans'}
.station-full h3{margin:0 0 4px;font-size:1.25rem}
.station-full .learn{font-weight:600;color:var(--ink);margin:.2rem 0}
.station-full p{margin:.2rem 0;color:var(--muted)}
.station-full .meta-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px;align-items:center}
.tool-link{font-weight:600;font-size:.82rem;color:var(--teal-d);background:#eef6f4;border:1px solid var(--line);border-radius:999px;padding:5px 12px;cursor:pointer}
.tool-link:hover{border-color:var(--teal)}

/* Herramientas */
.need-grid{display:flex;flex-wrap:wrap;gap:16px;justify-content:center;align-items:stretch}
.need-grid>*{flex:0 1 220px}
.need{display:block;text-align:center;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px 14px;box-shadow:var(--shadow);transition:.18s;cursor:pointer}
.need:hover{transform:translateY(-4px);border-color:var(--teal)}
.need .e{font-size:1.7rem}
.need b{display:block;margin-top:6px;font-family:'Plus Jakarta Sans'}
.tool{display:flex;gap:14px;padding:16px 0;border-top:1px solid var(--line)}
.tool:first-of-type{border-top:0}
.tool .e{flex:0 0 40px;height:40px;border-radius:10px;display:grid;place-items:center;font-size:1.2rem;background:#f0f7f5}
.tool h4{margin:0 0 2px;font-size:1.02rem;font-family:'Plus Jakarta Sans'}
.tool p{margin:0;color:var(--muted);font-size:.9rem}
.tool .tip{font-size:.82rem;color:var(--teal-d);margin-top:3px}
.tool a.go{align-self:center;margin-left:auto;white-space:nowrap}

/* Plantillas */
.tpl{display:flex;flex-direction:column}
.tpl .top{display:flex;gap:14px;align-items:flex-start}
.tpl .e{flex:0 0 52px;height:52px;border-radius:13px;display:grid;place-items:center;font-size:1.6rem;background:#f0f7f5}
.tpl h3{margin:.1rem 0 .2rem;font-size:1.12rem}
.tpl .badge-rec{font-size:.7rem;font-weight:800;color:#fff;background:var(--teal);padding:3px 9px;border-radius:999px;text-transform:uppercase;letter-spacing:.05em}
.tpl ul{margin:14px 0;padding-left:18px;color:var(--muted);font-size:.92rem}
.tpl ul li{margin:4px 0}
.tpl .actions{margin-top:auto;display:flex;gap:10px;flex-wrap:wrap;padding-top:8px}

/* Checklist */
.check-block{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;margin-bottom:22px}
.check-head{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:18px 22px;background:#eaf6f2;border-bottom:1px solid var(--line)}
.check-head h3{margin:0;font-size:1.12rem}
.progress{height:8px;border-radius:999px;background:#e6efed;overflow:hidden;flex:1;max-width:200px}
.progress span{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--teal),var(--lime));transition:width .3s ease}
.check-item{display:flex;gap:13px;align-items:flex-start;padding:13px 22px;border-top:1px solid var(--line);cursor:pointer}
.check-item:first-child{border-top:0}
.check-item input{margin-top:4px;width:19px;height:19px;accent-color:var(--teal);cursor:pointer;flex:0 0 auto}
.check-item.done label{color:var(--muted);text-decoration:line-through}
.check-item label{cursor:pointer}

/* Quiz */
.quiz{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:28px}
.q-ref{background:#fbfdfc;border:1px dashed var(--line);border-radius:12px;padding:14px 16px;font-size:.92rem;margin:10px 0;cursor:pointer;transition:border-color .15s,background .15s;display:flex;gap:12px;align-items:flex-start}
.q-ref:hover{border-color:var(--teal);background:#f3faf8}
.q-ref .n{font-weight:800;color:var(--teal);font-family:'Plus Jakarta Sans'}
.q-ref.correct{border-color:var(--teal);background:#e9f7f4}
.q-ref.wrong{border-color:#e57373;background:#fdeded}
.q-feedback{margin-top:16px;padding:16px;border-radius:12px;display:none}
.q-feedback.show{display:block}
.q-feedback.ok{background:#e9f7f4;border-left:4px solid var(--teal)}
.q-feedback.no{background:#fdeded;border-left:4px solid #e57373}

/* Vitrina */
.filter-bar{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin-bottom:30px}
.filter{border:1.5px solid var(--line);background:#fff;border-radius:999px;padding:8px 18px;font-weight:600;font-size:.9rem;cursor:pointer;font-family:'Plus Jakarta Sans';transition:.15s}
.filter:hover{border-color:var(--teal)}
.filter.active{background:var(--teal);color:#fff;border-color:var(--teal)}
.work{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .18s ease;display:block;cursor:pointer}
.work:hover{transform:translateY(-5px)}
.work .thumb{height:140px;display:grid;place-items:center;font-size:2.4rem;background:linear-gradient(135deg,#e7f7f3,#eef6dc)}
.work .body{padding:18px}
.work .type{font-weight:700;font-size:.72rem;text-transform:uppercase;letter-spacing:.08em;color:var(--teal)}
.work h3{margin:.25rem 0 .3rem;font-size:1.02rem;line-height:1.3}
.work small{color:var(--muted)}

/* Comunidad */
.layout{display:grid;grid-template-columns:1.6fr 1fr;gap:28px;align-items:start;max-width:1320px;margin:0 auto}
.post{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px 18px;box-shadow:var(--shadow);display:flex;gap:14px;margin-bottom:14px}
.post .av{flex:0 0 42px;height:42px;border-radius:50%;display:grid;place-items:center;font-weight:700;color:#fff;background:linear-gradient(135deg,var(--teal),var(--lime));font-family:'Plus Jakarta Sans'}
.post .meta{font-size:.82rem;color:var(--muted)}
.ptag{font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;padding:3px 9px;border-radius:999px;margin-left:8px}
.ptag.logro{background:#eef6dc;color:#5b7a10} .ptag.duda{background:#fdeccd;color:#9a6300} .ptag.aviso{background:#e7f7f3;color:var(--teal-d)}
.badges{display:flex;flex-wrap:wrap;gap:18px;justify-content:center;align-items:stretch}
.badges>*{flex:0 1 250px}
.badge{display:flex;flex-direction:column;align-items:center;gap:8px;text-align:center}
.badge .b-ic{width:62px;height:62px;border-radius:50%;display:grid;place-items:center;font-size:1.7rem;background:linear-gradient(135deg,#e7f7f3,#eef6dc);border:2px solid var(--line)}
.badge small{color:var(--muted)}
.badge.locked .b-ic{filter:grayscale(1);opacity:.45}

/* Form */
.field{margin-bottom:16px}
.field label{display:block;font-weight:600;font-size:.9rem;margin-bottom:6px}
.field input,.field select,.field textarea{width:100%;padding:12px 14px;border:1.5px solid var(--line);border-radius:12px;font-family:inherit;font-size:.95rem;background:#fff}
.field input:focus,.field textarea:focus{outline:0;border-color:var(--teal)}
.how{display:flex;flex-wrap:wrap;gap:18px;justify-content:center;align-items:stretch}
.how>*{flex:0 1 240px}
.how .step{text-align:center}
.how .n{width:44px;height:44px;border-radius:12px;background:var(--ink);color:#fff;display:grid;place-items:center;font-weight:800;margin:0 auto 10px;font-family:'Plus Jakarta Sans'}
.join-grid{display:grid;grid-template-columns:1fr 1fr;gap:30px;align-items:center}

/* ===== Candado de acceso (login privado) ===== */
.pl-lock{position:fixed;inset:0;z-index:9999;background:linear-gradient(135deg,#0b2a2a,#0a6f66);display:grid;place-items:center;padding:22px}
.pl-lock-card{background:#fff;border-radius:22px;box-shadow:var(--shadow-lg);max-width:400px;width:100%;padding:34px;text-align:center}
.pl-lock-card .logo{justify-content:center;font-size:1.4rem;margin-bottom:10px}
.pl-lock-card h2{margin:.2rem 0 .3rem;font-size:1.4rem}
.pl-lock-card p{color:var(--muted);margin:0 0 18px;font-size:.95rem}
.pl-lock-card input{width:100%;padding:13px 15px;border:1.5px solid var(--line);border-radius:12px;font-size:1rem;text-align:center;letter-spacing:.05em}
.pl-lock-card input:focus{outline:0;border-color:var(--teal)}
.pl-lock-card button{margin-top:14px;width:100%}
.pl-err{color:#c0392b;font-weight:600;font-size:.9rem;margin-top:12px;min-height:1.2em}
.pl-logout{cursor:pointer}
.pl-logout:hover{color:var(--teal)}
body.pl-locked{overflow:hidden}

/* Responsive */
@media(max-width:920px){
  /* Las grillas de tarjetas (.g2/.g3/.g4/.cards3/.capas/.road/.need-grid/.how/.badges) ya se
     reacomodan solas con auto-fit según el ancho; aquí solo apilamos los layouts de 2 columnas. */
  .hero-grid{grid-template-columns:1fr;gap:34px}
  .hero-card{transform:none;max-width:430px}
  .layout,.join-grid{grid-template-columns:1fr}
  /* Menú del hamburguesa: compacto, para que quepan todas las secciones (hasta Comunidad)
     sin tener que desplazarse. Si aun así no cabe, el propio menú hace scroll. */
  .nav-links{position:fixed;inset:68px 0 auto 0;flex-direction:column;align-items:flex-start;background:var(--paper);border-bottom:1px solid var(--line);padding:12px 22px 16px;gap:5px;display:none;
             max-height:calc(100vh - 68px);overflow-y:auto;-webkit-overflow-scrolling:touch}
  .nav-links>a,.nav-group>.nav-top{padding:7px 0;line-height:1.25}
  .nav-links.open{display:flex}
  .hamb{display:block}
  .foot-grid{flex-direction:column}
  .tool a.go{display:none}
}
@media(max-width:560px){ .station-full{grid-template-columns:1fr} }

/* ===== Menú con desplegables ===== */
.nav-group{position:relative}
.nav-group>.nav-top{display:flex;align-items:center;gap:5px;cursor:pointer;font-weight:500}
.nav-group>.nav-top:hover{color:var(--teal)}
.nav-group.here>.nav-top{color:var(--teal);font-weight:700}
.nav-group .caret{font-size:.62rem;opacity:.6}
.dropdown{position:absolute;top:calc(100% + 8px);left:0;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow-lg);padding:8px;min-width:215px;display:none;flex-direction:column;gap:2px;z-index:60}
/* Desktop: el dropdown se abre al pasar el mouse por el grupo. El ::after es un puente invisible
   para que al bajar el mouse hacia el dropdown no se cierre en el espacio entre ambos. */
.nav-group:hover .dropdown,.nav-group.open .dropdown{display:flex}
.nav-group:hover>.nav-top{color:var(--teal)}
.nav-group::after{content:"";position:absolute;left:0;top:100%;width:100%;height:10px}
.dropdown a{padding:9px 12px;border-radius:8px;font-size:.9rem;white-space:nowrap;font-weight:500}
.dropdown a:hover{background:#eef6f4;color:var(--teal-d)}
.dropdown a.active{background:#e7f7f3;color:var(--teal-d);font-weight:700}
@media(max-width:920px){
  /* Móvil: sin hover. El menú del hamburguesa muestra cada grupo con sus enlaces ya expandidos. */
  .dropdown{position:static;box-shadow:none;border:0;padding:0 0 4px 12px;min-width:0;display:flex;background:transparent;gap:0}
  .dropdown a{padding:6px 8px;font-size:.88rem}
  .nav-group{width:100%}
  .nav-group::after{display:none}
}