:root{--bg:#090b08;--panel:#121710;--text:#f3eee4;--muted:#aaa899;--gold:#c8953d;--gold2:#e0b765;--olive:#74804f;--border:rgba(224,183,101,.22);--soft:rgba(255,255,255,.08);--success:#9fce8b;--danger:#e4aaa3}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:radial-gradient(circle at 85% 5%,rgba(116,128,79,.16),transparent 28%),var(--bg);color:var(--text);font-family:Tahoma,Arial,sans-serif;line-height:1.8}a{color:inherit;text-decoration:none}button,input,select{font:inherit}img{display:block;max-width:100%}.container{width:min(1180px,calc(100% - 30px));margin:auto}
header{position:sticky;top:0;z-index:40;background:rgba(9,11,8,.9);backdrop-filter:blur(14px);border-bottom:1px solid var(--soft)}.nav{min-height:74px;display:flex;align-items:center;gap:22px}.brand{margin-left:auto;display:flex;align-items:center;gap:12px}.logo{width:48px;height:48px;border-radius:14px;border:1px solid var(--border);display:grid;place-items:center;color:var(--gold2);font-family:Georgia,serif}.brand small{display:block;color:var(--muted);font-size:11px}.nav a{font-size:14px;color:#dad7cc}
.hero{padding:80px 0 55px}.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:center}.pill{display:inline-flex;align-items:center;padding:7px 12px;border:1px solid var(--border);border-radius:999px;background:rgba(200,149,61,.06);color:var(--gold2);font-size:13px}.hero h1{font-size:clamp(36px,5vw,68px);line-height:1.15;margin:18px 0}.hero h1 span{display:block;background:linear-gradient(90deg,var(--gold2),#a8b27a);-webkit-background-clip:text;background-clip:text;color:transparent}.lead{color:#c7c5ba;font-size:18px}.actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:26px}.btn{min-height:50px;padding:0 22px;border-radius:14px;border:1px solid var(--border);background:transparent;color:var(--text);display:inline-flex;align-items:center;justify-content:center;cursor:pointer}.btn.primary{background:linear-gradient(135deg,var(--gold2),var(--gold));color:#181307;border:0;font-weight:700}
.hero-image{height:620px;overflow:hidden;border-radius:80px 18px 80px 18px;border:1px solid var(--border)}.hero-image img{width:100%;height:100%;object-fit:cover;object-position:52% 30%}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:34px}.stat{padding:16px;border:1px solid var(--soft);border-radius:14px;background:rgba(255,255,255,.02)}.stat strong{display:block;color:var(--gold2);font-size:24px}.stat small{color:var(--muted)}
.section{padding:90px 0}.section-head{text-align:center;max-width:760px;margin:0 auto 40px}.section-head h2{font-size:clamp(30px,4vw,48px);margin:12px 0}.about-grid,.price-grid,.register-grid{display:grid;grid-template-columns:.95fr 1.05fr;gap:38px;align-items:center}.about-grid img{width:100%;height:520px;object-fit:cover;object-position:52% 30%;border-radius:22px;border:1px solid var(--border)}.card{padding:26px;border:1px solid var(--soft);border-radius:20px;background:rgba(255,255,255,.025)}
.price-card{padding:30px;border:1px solid var(--border);border-radius:24px;background:linear-gradient(135deg,rgba(200,149,61,.08),rgba(116,128,79,.05))}.badge{display:inline-block;padding:7px 12px;border-radius:999px;background:rgba(200,149,61,.12);color:var(--gold2);font-size:13px;margin-bottom:10px}.old{color:#9d9c92;text-decoration:line-through;font-size:22px}.new{font-size:44px;color:var(--gold2);font-weight:700;margin:6px 0 10px}
.register-panel{padding:26px;border:1px solid var(--border);border-radius:22px;background:rgba(255,255,255,.03)}.form-row{margin-bottom:14px}.form-row label{display:block;margin-bottom:6px;color:#d8d5ca;font-size:13px}.form-row input,.form-row select{width:100%;min-height:50px;border:1px solid var(--soft);border-radius:12px;background:#0d100c;color:var(--text);padding:0 14px}.form-note{font-size:12px;color:var(--muted);margin-top:12px}#registerMessage{margin-top:12px;min-height:24px}
.login-box{max-width:720px;margin:45px auto 0;padding:24px;border:1px solid var(--border);border-radius:20px;background:rgba(255,255,255,.03);text-align:center}.login-box input{width:100%;max-width:370px;min-height:52px;padding:0 14px;border:1px solid var(--soft);border-radius:12px;background:#0d100c;color:var(--text);margin:16px auto 12px;display:block}.login-message{margin-top:10px;color:var(--danger);min-height:24px}
.student-platform{display:none}.student-open .student-platform{display:block}.progress-card{padding:18px;border:1px solid var(--soft);border-radius:16px;background:rgba(255,255,255,.02);margin-bottom:24px}.progress-head{display:flex;justify-content:space-between;margin-bottom:10px}.progress-head span{color:var(--muted)}.progress-track{height:10px;border-radius:999px;background:#20251d;overflow:hidden}.progress-track span{display:block;width:0;height:100%;background:linear-gradient(90deg,var(--gold),var(--gold2));transition:.3s}
.course-layout{display:grid;grid-template-columns:285px 1fr;gap:22px;align-items:start}.course-sidebar{position:sticky;top:92px;padding:18px;border:1px solid var(--soft);border-radius:18px;background:rgba(18,23,16,.94)}.course-sidebar h3{margin:0 0 12px}.lesson-menu{display:grid;gap:8px}.lesson-button{width:100%;display:flex;gap:10px;align-items:center;padding:10px 12px;border-radius:10px;border:1px solid transparent;background:transparent;color:#ddd9cf;text-align:right;cursor:pointer}.lesson-button span{width:34px;height:34px;border-radius:10px;border:1px solid var(--border);display:grid;place-items:center;color:var(--gold2)}.lesson-button.active{background:rgba(200,149,61,.08);border-color:var(--border);color:#fff}
.lesson-page{display:none}.lesson-page.active{display:block}.lesson-heading{display:grid;grid-template-columns:70px 1fr auto;gap:16px;align-items:start;margin-bottom:18px}.lesson-number{width:66px;height:66px;border-radius:17px;border:1px solid var(--border);display:grid;place-items:center;color:var(--gold2);font-size:23px;background:rgba(200,149,61,.06)}.lesson-heading h2{margin:8px 0 5px;font-size:34px}.lesson-heading p{margin:0;color:var(--muted)}.done-button{padding:10px 14px;border:1px solid var(--border);border-radius:11px;background:transparent;color:var(--text);cursor:pointer}.done-button.done{border-color:rgba(159,206,139,.45);background:rgba(159,206,139,.1);color:#d8eed0}
.diagram-box{padding:14px;border:1px solid var(--soft);border-radius:20px;background:rgba(255,255,255,.02);margin-bottom:18px}.diagram-box svg{width:100%;height:auto;display:block}.student-callout{padding:18px 20px;border-right:4px solid var(--gold);border-radius:14px;background:rgba(200,149,61,.05);margin-bottom:18px}.student-callout p{margin:4px 0 0;color:#cbc8bc}.section-title{margin:24px 0 12px;color:var(--gold2);font-weight:700}.topics-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.topic-card{padding:18px;border:1px solid var(--soft);border-radius:16px;background:rgba(255,255,255,.018)}.topic-card h4{margin:0 0 8px;font-size:18px}.topic-card ul{margin:0;padding-right:20px;color:#c8c5b9}.practice-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:18px}.practice-card,.homework-card{padding:20px;border:1px solid var(--soft);border-radius:18px}.practice-card{background:rgba(116,128,79,.06)}.homework-card{background:rgba(200,149,61,.05)}.practice-card h3,.homework-card h3{margin:0 0 10px}.practice-card ol,.homework-card ul{margin:0;padding-right:20px}
.extra-section{margin-top:28px;padding:30px;border:1px solid var(--border);border-radius:22px;background:linear-gradient(135deg,rgba(200,149,61,.07),rgba(116,128,79,.04))}.project-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.project-grid article{padding:18px;border:1px solid var(--soft);border-radius:15px;background:rgba(0,0,0,.12)}.project-grid span{color:var(--gold)}.evaluation-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:10px;margin-top:18px}.evaluation-grid div{padding:14px;border:1px solid var(--soft);border-radius:13px;text-align:center}.evaluation-grid strong{display:block;color:var(--gold2);font-size:23px}.terms-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.term-card{padding:14px;border:1px solid var(--soft);border-radius:13px;background:rgba(0,0,0,.12)}.term-card strong{display:block;color:var(--gold2)}.term-card span{color:var(--muted);font-size:13px}.footer{padding:28px 0;border-top:1px solid var(--soft);text-align:center;color:#8f8d84}
.whatsapp-float{
  position:fixed;left:18px;bottom:18px;z-index:60;width:56px;height:56px;
  display:grid;place-items:center;border-radius:50%;background:#25D366;color:white;
  font-size:25px;text-decoration:none;border:3px solid rgba(255,255,255,.18);
  box-shadow:0 12px 30px rgba(0,0,0,.35)
}
.whatsapp-float:hover{transform:translateY(-2px)}
.social-links{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
.social-link{padding:10px 14px;border:1px solid var(--border);border-radius:12px;background:rgba(255,255,255,.02)}
@media(max-width:980px){.hero-grid,.about-grid,.price-grid,.register-grid{grid-template-columns:1fr}.course-layout{grid-template-columns:1fr}.course-sidebar{position:static}.lesson-menu{grid-template-columns:1fr 1fr}.topics-grid,.practice-grid{grid-template-columns:1fr}.terms-grid{grid-template-columns:1fr 1fr}.evaluation-grid{grid-template-columns:repeat(3,1fr)}}
@media(max-width:680px){.nav{gap:12px;flex-wrap:wrap;padding:10px 0}.hero-image{height:430px}.stats,.project-grid,.terms-grid,.evaluation-grid,.lesson-menu{grid-template-columns:1fr}.lesson-heading{grid-template-columns:55px 1fr}.lesson-number{width:55px;height:55px}.done-button{grid-column:1/-1}.lesson-heading h2{font-size:27px}}

.alert{padding:14px 16px;border:1px solid var(--border);border-radius:13px;margin:14px 0}.alert.error{color:#ffd3ce;background:rgba(228,170,163,.08)}.alert.success{color:#d9f0cf;background:rgba(159,206,139,.08)}
.form-row textarea{width:100%;min-height:100px;border:1px solid var(--soft);border-radius:12px;background:#0d100c;color:var(--text);padding:12px 14px}
.code-note{font-size:13px;color:var(--muted)}