/* =========================
   RESET + TOKENS (PALETA GRIS)
========================= */
*{ box-sizing:border-box; margin:0; padding:0; }
html{ scrollbar-width:none; scroll-behavior:smooth; }

:root{
  --color-50:  #F0F3F4;
  --color-100: #D6DDE0;
  --color-200: #BCC7CD;
  --color-300: #A2B1B9;
  --color-400: #889BA5;
  --color-500: #6E8591;
  --color-600: #5A6D77;
  --color-700: #46555D;
  --color-800: #323D43;
  --color-900: #1B2124;
  --color-950: #0B0D0F;

  --bg: var(--color-950);
  --surface: rgba(27,33,36,0.86);
  --card: rgba(27,33,36,0.70);

  --text: var(--color-50);
  --muted: rgba(240,243,244,0.72);
  --muted2: rgba(240,243,244,0.56);

  --line: rgba(240,243,244,0.10);
  --line2: rgba(240,243,244,0.16);

  --shadow: 0 18px 48px rgba(0,0,0,0.45);
  --shadow2: 0 10px 24px rgba(0,0,0,0.35);

  --r12: 12px;
  --r16: 16px;
  --r20: 20px;

  --ease: cubic-bezier(.2,.8,.2,1);
}

@keyframes enterUp{
  from{ opacity:0; transform: translateY(12px); }
  to{ opacity:1; transform: translateY(0); }
}

body{
  font-family: "Open Sans", system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  opacity:.10;
  background-image:
    linear-gradient(90deg, rgba(240,243,244,0.03) 1px, transparent 1px),
    linear-gradient(0deg, rgba(240,243,244,0.02) 1px, transparent 1px);
  background-size: 52px 52px;
}

.page{
  width:min(1000px, calc(100% - 28px));
  margin:0 auto;
}

/* =========================
   HEADER
========================= */
header{
  position: sticky;
  top: 0;
  z-index: 999;
  backdrop-filter: blur(10px);
  background: linear-gradient(180deg, rgba(11,13,15,0.92), rgba(11,13,15,0.62));
  border-bottom: 1px solid var(--line);
}

.header-inner{
  height: 74px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 12px;
}

.back{
  display:flex;
  align-items:center;
  gap:10px;
  text-decoration:none;
  color: var(--text);
  padding: 10px 12px;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: transform .16s var(--ease), background .16s var(--ease), border-color .16s var(--ease);
}
.back:hover{
  transform: translateY(-1px);
  background: rgba(240,243,244,0.04);
  border-color: var(--line2);
}
.back__icon{
  width:38px;
  height:38px;
  display:grid;
  place-items:center;
  border-radius: 999px;
  background: rgba(240,243,244,0.04);
  border: 1px solid var(--line);
}
.back__text{
  font-weight: 900;
  color: rgba(240,243,244,0.90);
}

.mini-profile{
  display:flex;
  align-items:center;
  justify-content:center;
}
.mini-profile__avatar{
  width:40px;
  height:40px;
  border-radius: 999px;
  border: 1px solid var(--line2);
  background: rgba(240,243,244,0.05);
  display:grid;
  place-items:center;
  font-weight: 900;
  color: rgba(240,243,244,0.86);
}

/* =========================
   MAIN
========================= */
.contenido{
  padding: 22px 0 50px;
  display:flex;
  flex-direction:column;
  gap: 14px;
}

.hero{
  border: 1px solid var(--line);
  background: rgba(27,33,36,0.55);
  border-radius: var(--r20);
  padding: 18px 16px;
  box-shadow: var(--shadow2);
  animation: enterUp .55s var(--ease) both;
}

.hero__badge{
  display:inline-flex;
  align-items:center;
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(240,243,244,0.04);
  color: rgba(240,243,244,0.86);
  font-weight: 900;
  width: fit-content;
}

#username{
  margin-top: 10px;
  font-size: clamp(1.35rem, 2.8vw, 2.0rem);
  font-weight: 900;
  letter-spacing: .2px;
}

.hero__sub{
  margin-top: 8px;
  color: var(--muted);
  font-weight: 700;
  line-height: 1.6;
}

.hero__stats{
  margin-top: 14px;
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}
.stat{
  border: 1px solid var(--line);
  background: rgba(27,33,36,0.55);
  border-radius: var(--r16);
  padding: 12px;
}
.stat__label{
  display:block;
  color: var(--muted2);
  font-weight: 800;
  font-size: .92rem;
}
.stat__value{
  display:block;
  margin-top: 6px;
  font-size: 1.35rem;
  font-weight: 1000;
}

/* Panel */
.panel{
  border: 1px solid var(--line);
  background: rgba(27,33,36,0.55);
  border-radius: var(--r20);
  padding: 16px;
  box-shadow: var(--shadow2);
  animation: enterUp .55s var(--ease) .06s both;
}

.panel__head{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap: 10px;
  margin-bottom: 12px;
}
.panel__head h2{
  font-size: 1.15rem;
  font-weight: 1000;
  color: rgba(240,243,244,0.92);
}
.hint{
  color: var(--muted2);
  font-weight: 800;
  font-size: .92rem;
}

/* Grid de progreso */
.progreso{
  display:grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.leccion{
  border: 1px solid var(--line);
  background: rgba(27,33,36,0.62);
  border-radius: var(--r16);
  padding: 12px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 10px;
  transition: transform .16s var(--ease), border-color .16s var(--ease), background .16s var(--ease);
}
.leccion:hover{
  transform: translateY(-2px);
  border-color: rgba(240,243,244,0.18);
  background: rgba(27,33,36,0.74);
}
.leccion .txt{
  display:flex;
  flex-direction:column;
  gap: 2px;
}
.leccion .txt strong{
  font-weight: 1000;
}
.leccion .txt span{
  color: var(--muted2);
  font-weight: 800;
  font-size: .92rem;
}
.leccion .badge{
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid rgba(240,243,244,0.12);
  background: rgba(240,243,244,0.05);
  color: rgba(240,243,244,0.86);
  font-weight: 1000;
  font-size: .92rem;
}

/* Certificado */
.cert{
  margin-top: 12px;
}
.cert__box{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 12px;
  border: 1px solid var(--line);
  background: rgba(240,243,244,0.04);
  border-radius: var(--r16);
  padding: 14px;
}
.cert__left h3{
  margin:0;
  font-weight: 1000;
}
.cert__left p{
  margin-top: 6px;
  color: var(--muted);
  font-weight: 700;
  line-height: 1.5;
}

.btn{
  text-decoration:none;
  color: var(--text);
  border: 1px solid rgba(240,243,244,0.16);
  background: rgba(240,243,244,0.06);
  padding: 10px 12px;
  border-radius: 999px;
  font-weight: 1000;
  transition: transform .16s var(--ease), background .16s var(--ease), border-color .16s var(--ease);
  white-space: nowrap;
}
.btn:hover{
  transform: translateY(-2px);
  background: rgba(240,243,244,0.08);
  border-color: rgba(240,243,244,0.22);
}

/* Subir */
.subir{
  display:flex;
  justify-content:center;
}
.subir a{
  text-decoration:none;
  color: rgba(240,243,244,0.86);
  border: 1px solid var(--line);
  background: rgba(240,243,244,0.04);
  padding: 10px 14px;
  border-radius: 999px;
  font-weight: 900;
  transition: transform .16s var(--ease), background .16s var(--ease), border-color .16s var(--ease);
}
.subir a:hover{
  transform: translateY(-2px);
  background: rgba(240,243,244,0.06);
  border-color: rgba(240,243,244,0.18);
}

/* =========================
   RESPONSIVE
========================= */
@media (max-width: 820px){
  .progreso{ grid-template-columns: 1fr; }
  .hero__stats{ grid-template-columns: 1fr; }
  .cert__box{ flex-direction: column; align-items: stretch; }
  .btn{ justify-content:center; text-align:center; }
}

@media (max-width: 520px){
  .back__text{ display:none; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce){
  *{ animation:none !important; transition:none !important; scroll-behavior:auto !important; }
}