:root{--dh64-indigo:#5757e8;--dh64-purple:#7c4dff;--dh64-ink:#20213a;--dh64-muted:#6f7287;--dh64-bg:#f6f7fc;--dh64-card:#fff;--dh64-green:#24b47e;--dh64-shadow:0 18px 50px rgba(35,38,80,.14)}
.dh64-launcher{position:fixed;right:22px;bottom:164px;z-index:11000;border:0;border-radius:18px;padding:12px 18px;background:linear-gradient(135deg,var(--dh64-indigo),var(--dh64-purple));color:#fff;box-shadow:0 14px 30px rgba(87,87,232,.35);display:flex;align-items:center;gap:9px;font:700 14px/1.2 system-ui;cursor:pointer}.dh64-launcher span{font-size:20px}
.dh64-shell{position:fixed;inset:0;z-index:20000;background:var(--dh64-bg);display:grid;grid-template-columns:240px 1fr;color:var(--dh64-ink);font-family:Inter,ui-rounded,"Segoe UI",system-ui,sans-serif}.dh64-shell[hidden]{display:none}.dh64-open{overflow:hidden!important}.dh64-sidebar{background:#fff;border-right:1px solid #e9eaf3;padding:24px 16px;display:flex;flex-direction:column}.dh64-brand{display:flex;gap:12px;align-items:center;padding:0 10px 28px}.dh64-brand>span{display:grid;place-items:center;width:44px;height:44px;border-radius:14px;background:#eef0ff;font-size:24px}.dh64-brand b{display:block;font-size:18px}.dh64-brand small{color:var(--dh64-muted)}.dh64-sidebar nav{display:grid;gap:8px}.dh64-nav-item{border:0;background:transparent;border-radius:14px;padding:13px 14px;display:flex;align-items:center;gap:12px;color:#5f6277;text-align:left;cursor:pointer}.dh64-nav-item span{font-size:20px}.dh64-nav-item.active,.dh64-nav-item:hover{background:#eef0ff;color:var(--dh64-indigo)}.dh64-side-note{margin-top:auto;background:linear-gradient(145deg,#23254a,#3b3f78);color:#fff;border-radius:18px;padding:16px}.dh64-side-note span{display:inline-grid;place-items:center;width:36px;height:36px;border-radius:11px;background:#8d79ff;font-weight:900}.dh64-side-note p{margin:10px 0 0;font-size:12px;opacity:.85}.dh64-main{min-width:0;overflow:auto}.dh64-topbar{height:76px;background:#fff;border-bottom:1px solid #e9eaf3;display:flex;align-items:center;padding:0 30px;gap:14px;position:sticky;top:0;z-index:2}.dh64-topbar b,.dh64-topbar small{display:block}.dh64-topbar small{color:var(--dh64-muted)}.dh64-top-actions{margin-left:auto;display:flex;gap:10px}.dh64-top-actions button,.dh64-section-head button{border:1px solid #e2e4ee;background:#fff;border-radius:12px;padding:10px 13px;cursor:pointer}.dh64-mobile-menu{display:none}.dh64-content{max-width:1280px;margin:auto;padding:30px}.dh64-page{display:grid;gap:26px}.dh64-hero{background:linear-gradient(135deg,#5b5ee8 0%,#8c5cf5 62%,#b777ff 100%);border-radius:28px;padding:42px;color:#fff;display:grid;grid-template-columns:1fr 220px;align-items:center;box-shadow:var(--dh64-shadow);overflow:hidden}.dh64-eyebrow,.dh64-page-title span,.dh64-section-head span,.dh64-lesson-hero span,.dh64-activity-card small{font-size:11px;font-weight:900;letter-spacing:.16em;opacity:.78}.dh64-hero h1,.dh64-page-title h1,.dh64-lesson-hero h1{font-size:clamp(30px,4vw,48px);margin:8px 0 12px}.dh64-hero p{font-size:17px;max-width:680px;opacity:.9}.dh64-hero-actions{display:flex;gap:12px;margin-top:24px}.dh64-primary,.dh64-ghost{border:0;border-radius:14px;padding:13px 18px;font-weight:800;cursor:pointer}.dh64-primary{background:#fff;color:var(--dh64-indigo)}.dh64-primary:disabled{opacity:.4;cursor:not-allowed}.dh64-ghost{background:rgba(255,255,255,.15);color:#fff;border:1px solid rgba(255,255,255,.3)}.dh64-hero-mascot{text-align:center}.dh64-hero-mascot span{display:block;font-size:100px;filter:drop-shadow(0 14px 16px rgba(0,0,0,.15))}.dh64-hero-mascot small{display:inline-block;background:rgba(255,255,255,.18);padding:7px 12px;border-radius:99px}.dh64-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.dh64-stats article{background:#fff;border-radius:20px;padding:20px;display:grid;grid-template-columns:auto 1fr;column-gap:12px;box-shadow:0 8px 24px rgba(30,34,70,.07)}.dh64-stats article>span{grid-row:1/3;font-size:32px}.dh64-stats strong{font-size:25px}.dh64-stats small{color:var(--dh64-muted)}.dh64-section-head{display:flex;justify-content:space-between;align-items:end}.dh64-section-head h2{margin:5px 0 0;font-size:25px}.dh64-section-head span{color:var(--dh64-indigo)}.dh64-continue-card{background:#fff;border-radius:22px;padding:22px;display:grid;grid-template-columns:72px 1fr 50px;gap:18px;align-items:center;box-shadow:0 8px 24px rgba(30,34,70,.07)}.dh64-lesson-icon{display:grid;place-items:center;width:64px;height:64px;border-radius:18px;background:#fff4df;font-size:34px}.dh64-continue-copy span,.dh64-lesson-row span{font-size:11px;font-weight:900;color:var(--dh64-indigo);letter-spacing:.08em}.dh64-continue-copy h3,.dh64-lesson-row h3{margin:5px 0}.dh64-continue-copy p,.dh64-lesson-row p{margin:0 0 10px;color:var(--dh64-muted)}.dh64-progress,.dh64-mini{height:8px;background:#ebedf5;border-radius:99px;overflow:hidden}.dh64-progress i,.dh64-mini i{display:block;height:100%;background:linear-gradient(90deg,var(--dh64-indigo),#9d68ff);border-radius:inherit}.dh64-round{width:48px;height:48px;border:0;border-radius:50%;background:var(--dh64-indigo);color:#fff;font-size:22px;cursor:pointer}.dh64-skill-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:14px}.dh64-skill-grid article{background:#fff;border-radius:18px;padding:18px;display:grid;grid-template-columns:auto 1fr;gap:10px;align-items:center}.dh64-skill-grid article>span{font-size:25px}.dh64-skill-grid strong{grid-column:2;font-size:18px}.dh64-mini{margin-top:7px;height:6px}.dh64-page-title{padding:10px 0}.dh64-page-title h1{font-size:38px}.dh64-page-title p{color:var(--dh64-muted)}.dh64-course-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.dh64-course-card{background:#fff;border-radius:24px;overflow:hidden;box-shadow:0 8px 24px rgba(30,34,70,.07)}.dh64-course-cover{height:170px;background:linear-gradient(135deg,#e9eaff,#f7e9ff);display:flex;align-items:center;justify-content:center;position:relative}.dh64-course-cover span{font-size:78px}.dh64-course-cover em{position:absolute;top:16px;right:16px;background:#fff;padding:7px 10px;border-radius:99px;font-style:normal;font-weight:800;color:var(--dh64-indigo)}.dh64-course-body{padding:22px}.dh64-course-body h2{margin:0}.dh64-course-body p{color:var(--dh64-muted)}.dh64-course-body button,.dh64-lesson-row button,.dh64-activity-card button{margin-top:15px;border:0;border-radius:12px;padding:11px 15px;background:var(--dh64-indigo);color:#fff;font-weight:800;cursor:pointer}.dh64-back{justify-self:start;border:0;background:transparent;color:var(--dh64-indigo);font-weight:800;cursor:pointer}.dh64-course-banner,.dh64-lesson-hero{background:linear-gradient(135deg,#eef0ff,#fff);border-radius:24px;padding:28px;display:flex;gap:24px;align-items:center}.dh64-course-banner>span,.dh64-big-icon{font-size:72px}.dh64-course-banner h1{margin:4px 0}.dh64-course-banner em{font-style:normal;color:var(--dh64-indigo);font-weight:900}.dh64-lesson-list{display:grid;gap:12px}.dh64-lesson-row{background:#fff;border-radius:18px;padding:16px;display:grid;grid-template-columns:44px 64px 1fr auto;gap:14px;align-items:center;border:2px solid transparent}.dh64-lesson-row.current{border-color:#a6a8ff}.dh64-lesson-row.complete{opacity:.72}.dh64-step{display:grid;place-items:center;width:38px;height:38px;border-radius:50%;background:#eef0ff;color:var(--dh64-indigo);font-weight:900}.dh64-activity-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}.dh64-activity-card{background:#fff;border-radius:22px;padding:22px;border:2px solid transparent}.dh64-activity-card.complete{border-color:#8be0be;background:#f5fffb}.dh64-activity-card>span{font-size:42px}.dh64-activity-card h3{font-size:21px;margin:8px 0}.dh64-activity-card p{color:var(--dh64-muted);min-height:64px}.dh64-lesson-footer{background:#fff;border-radius:20px;padding:20px;display:flex;align-items:center;gap:24px;justify-content:space-between}.dh64-lesson-footer>div{flex:1}.dh64-lesson-footer .dh64-primary{background:var(--dh64-indigo);color:#fff}
@media(max-width:900px){.dh64-shell{grid-template-columns:1fr}.dh64-sidebar{display:none}.dh64-content{padding:18px}.dh64-hero{grid-template-columns:1fr;padding:28px}.dh64-hero-mascot{display:none}.dh64-stats{grid-template-columns:repeat(2,1fr)}.dh64-skill-grid{grid-template-columns:repeat(2,1fr)}.dh64-course-grid{grid-template-columns:1fr}.dh64-activity-grid{grid-template-columns:repeat(2,1fr)}.dh64-top-actions button:first-child{display:none}.dh64-mobile-menu{display:block;border:0;background:none;font-size:22px}.dh64-launcher{right:12px;bottom:142px}.dh64-lesson-row{grid-template-columns:40px 52px 1fr}.dh64-lesson-row button{grid-column:3;justify-self:start}.dh64-lesson-footer{align-items:stretch;flex-direction:column}}
@media(max-width:560px){.dh64-topbar{padding:0 14px}.dh64-content{padding:12px}.dh64-hero{border-radius:20px}.dh64-hero h1{font-size:30px}.dh64-hero-actions{flex-direction:column}.dh64-stats{grid-template-columns:1fr 1fr}.dh64-skill-grid,.dh64-activity-grid{grid-template-columns:1fr}.dh64-continue-card{grid-template-columns:58px 1fr}.dh64-round{grid-column:2}.dh64-course-banner,.dh64-lesson-hero{align-items:flex-start}.dh64-course-banner>span,.dh64-big-icon{font-size:50px}}