*{margin:0;padding:0;box-sizing:border-box}
body{font-family:'Segoe UI',Arial,sans-serif;background:#0d1117;color:#e6edf3;line-height:1.6}
a{color:#58a6ff;text-decoration:none}
a:hover{text-decoration:underline}

/* ---- TOP BAR ---- */
.topbar{
  background:#161b22;
  border-bottom:1px solid #30363d;
  position:sticky;top:0;z-index:100;
  display:flex;align-items:center;flex-wrap:wrap;gap:8px;
  padding:0 20px;min-height:56px;
}
.topbar .brand{display:flex;align-items:center;gap:8px;margin-right:16px}
.topbar .brand img{width:36px;height:36px;object-fit:contain}
.topbar .brand span{font-size:16px;font-weight:700;color:#fff;letter-spacing:1px}
.topbar .nav-links{display:flex;flex-wrap:wrap;gap:4px}
.topbar .nav-links a{
  color:#8b949e;font-size:13px;font-weight:600;padding:6px 12px;
  border-radius:6px;transition:.15s
}
.topbar .nav-links a:hover{color:#fff;background:#21262d;text-decoration:none}
.topbar .nav-links a.active{color:#fff;background:#238636}
.topbar .nav-right{margin-left:auto;display:flex;align-items:center;gap:10px}
.lang-btn{
  background:transparent;border:1px solid #30363d;color:#8b949e;
  padding:4px 10px;border-radius:6px;font-size:12px;font-weight:700;
  cursor:pointer;transition:.15s;letter-spacing:1px
}
.lang-btn:hover{border-color:#58a6ff;color:#fff}
.topbar .back-colibri{
  display:inline-flex;align-items:center;gap:5px;
  background:#8b5cf6;color:#fff;padding:6px 14px;border-radius:6px;
  font-size:12px;font-weight:700;white-space:nowrap
}

/* ---- HERO ---- */
.hero{
  text-align:center;padding:48px 20px 32px;
  background:
    linear-gradient(rgba(13,17,23,0.75), rgba(13,17,23,0.85)),
    url("assets/fondo_hero.png");
  background-size:cover;background-position:center;background-repeat:no-repeat;
}
.hero h1{font-size:28px;margin-bottom:8px;color:#58a6ff}
.hero p{font-size:15px;color:#8b949e;max-width:600px;margin:0 auto 16px}
.hero .btn-primary{
  background:#238636;color:#fff;border:none;padding:12px 28px;
  font-size:15px;font-weight:700;border-radius:8px;cursor:pointer;transition:.15s
}
.hero .btn-primary:hover{background:#2ea043}

/* ---- LEVEL NAV ---- */
.level-nav{
  display:flex;flex-wrap:wrap;justify-content:center;gap:6px;
  padding:12px 20px;background:#161b22;border-bottom:1px solid #30363d;
  position:sticky;top:56px;z-index:99;
}
.level-pill{
  padding:7px 16px;border-radius:20px;font-size:13px;font-weight:600;
  border:1px solid #30363d;background:#0d1117;color:#8b949e;
  transition:.15s;white-space:nowrap;text-decoration:none
}
.level-pill:hover{color:#e6edf3;border-color:#58a6ff;text-decoration:none}
.level-pill.active{background:#238636;border-color:#238636;color:#fff}
.level-pill.l1{border-left:3px solid #3fb950}
.level-pill.l2{border-left:3px solid #58a6ff}
.level-pill.l3{border-left:3px solid #bc8cff}
.level-pill.l4{border-left:3px solid #f0883e}

/* ---- SEARCH ---- */
.search-wrap{max-width:560px;margin:0 auto 28px auto;position:relative}
.search-wrap input{
  width:100%;padding:12px 40px 12px 16px;border:1px solid #30363d;
  border-radius:8px;background:#0d1117;color:#e6edf3;font-size:15px;outline:none
}
.search-wrap input:focus{border-color:#58a6ff}
.search-wrap .search-icon{
  position:absolute;right:14px;top:50%;transform:translateY(-50%);
  color:#8b949e;font-size:16px;pointer-events:none
}

/* ---- SECTION ---- */
.section{padding:32px 20px;max-width:1200px;margin:0 auto}
.section-title{font-size:22px;font-weight:700;margin-bottom:20px;text-align:center}
.level-header{
  display:flex;align-items:center;gap:10px;
  font-size:14px;font-weight:700;padding:8px 16px;border-radius:8px;
  margin:28px 0 16px 0;border:1px solid #30363d;background:#161b22
}
.level-header .badge{
  display:inline-block;padding:2px 10px;border-radius:12px;
  font-size:11px;font-weight:700
}
.l1 .badge{background:#3fb95033;color:#3fb950;border:1px solid #3fb95055}
.l2 .badge{background:#58a6ff33;color:#58a6ff;border:1px solid #58a6ff55}
.l3 .badge{background:#bc8cff33;color:#bc8cff;border:1px solid #bc8cff55}
.l4 .badge{background:#f0883e33;color:#f0883e;border:1px solid #f0883e55}
.l1 .level-header{border-left:4px solid #3fb950}
.l2 .level-header{border-left:4px solid #58a6ff}
.l3 .level-header{border-left:4px solid #bc8cff}
.l4 .level-header{border-left:4px solid #f0883e}

/* ---- COURSE CARD GRID ---- */
.courses-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(140px,1fr));
  gap:10px;
}
.course-card{
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:6px;padding:16px 8px;border-radius:8px;text-align:center;
  font-size:13px;font-weight:600;color:#e6edf3;
  border:1px solid #30363d;background:#161b22;transition:.15s;
  text-decoration:none
}
.course-card:hover{
  background:#1c2128;border-color:#58a6ff;transform:translateY(-2px);text-decoration:none
}
.course-card .icon{font-size:24px;line-height:1}
.course-card .name{font-size:12px;line-height:1.2}
.course-card .caps{font-size:10px;color:#8b949e}
.course-card.n1{border-top:3px solid #3fb950}
.course-card.n2{border-top:3px solid #58a6ff}
.course-card.n3{border-top:3px solid #bc8cff}
.course-card.n4{border-top:3px solid #f0883e}
.course-card.n1:hover{border-color:#3fb950}
.course-card.n2:hover{border-color:#58a6ff}
.course-card.n3:hover{border-color:#bc8cff}
.course-card.n4:hover{border-color:#f0883e}

/* ---- PROFESOR BUHO ---- */
.buho-section{background:#161b22;border:1px solid #30363d;border-radius:12px;padding:24px;margin-top:32px}
.buho-section h2{font-size:20px;margin-bottom:12px}
.buho-section .buho-box{
  background:#21262d;padding:16px 20px;border-radius:8px;
  border-left:4px solid #d29922;font-size:14px;color:#d29922
}

/* ---- PROGRESS ---- */
.progress-wrap{max-width:500px;margin:0 auto;background:#161b22;border:1px solid #30363d;border-radius:12px;padding:24px}
.progress-wrap p{margin:6px 0;font-size:14px;color:#8b949e}
.progress-wrap strong{color:#e6edf3}
.bar{background:#30363d;height:20px;border-radius:10px;overflow:hidden;margin:12px 0}
.bar-fill{height:100%;background:#2ea043;border-radius:10px;transition:width .4s}

/* ---- FOOTER ---- */
footer{background:#161b22;border-top:1px solid #30363d;padding:24px;text-align:center;margin-top:40px;font-size:13px;color:#8b949e}
footer p{margin:4px 0}

/* ---- AUTH MODAL ---- */
#authModal{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.7);z-index:999;justify-content:center;align-items:center}
#authModal .modal-box{background:#161b22;padding:28px;border-radius:12px;width:360px;max-width:90%;border:1px solid #30363d}
#authModal .modal-box input{width:100%;padding:10px;margin:6px 0;border:1px solid #30363d;border-radius:6px;background:#0d1117;color:#fff;box-sizing:border-box;font-size:14px}
#authModal .modal-box input:focus{outline:none;border-color:#58a6ff}
#authModal .modal-box button{width:100%;padding:12px;background:#238636;color:#fff;border:none;border-radius:8px;font-weight:700;cursor:pointer;margin-top:10px;font-size:15px}
#authModal .modal-box button:hover{background:#2ea043}
#authModal .modal-box .auth-close{float:right;color:#8b949e;font-size:18px;cursor:pointer}

/* ---- RESPONSIVE ---- */
@media(max-width:768px){
  .topbar{padding:0 12px;min-height:50px}
  .topbar .brand span{font-size:14px}
  .topbar .nav-links a{padding:4px 8px;font-size:12px}
  .hero h1{font-size:22px}
  .hero{padding:32px 16px 24px}
  .courses-grid{grid-template-columns:repeat(auto-fill,minmax(110px,1fr))}
  .section{padding:20px 12px}
}