:root{color-scheme:light;--navy:#0b1024;--navy2:#111831;--ink:#151a2d;--muted:#646d81;--accent:#8e72ff;--accent2:#6553f5;--border:#e5e7ee;--surface:#fff;--offwhite:#f7f8fc;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#fff;color:var(--ink);font-size:15px;line-height:1.55}a{color:inherit;text-decoration:none}button{font:inherit;cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #94b8ff;outline-offset:3px}.container{width:min(1180px,calc(100% - 72px));margin-inline:auto}.skip-link{position:absolute;z-index:99;left:20px;top:-100px;background:white;padding:12px}.skip-link:focus{top:10px}.demo-banner{display:flex;align-items:center;justify-content:center;gap:9px;min-height:29px;padding:5px 16px;font-size:11px;letter-spacing:.02em;background:#e7e1ff;color:#382b80;font-weight:700;text-align:center}.demo-dot{height:7px;width:7px;border-radius:50%;background:#6d55de}.hero-wrap{background:radial-gradient(ellipse 45% 70% at 96% 50%,#292358 0%,transparent 80%),linear-gradient(130deg,#0a1023 0%,#111531 61%,#141037 100%);color:white;overflow:hidden}.site-header{min-height:83px;display:flex;align-items:center;justify-content:space-between;gap:22px}.brand{display:inline-flex;gap:10px;align-items:center;font-weight:800;letter-spacing:-.07em;font-size:25px;white-space:nowrap}.brand-mark{font-size:27px;font-weight:950;line-height:1;border:3px solid #9777ff;border-left:8px solid #9777ff;border-radius:6px;padding:3px 5px;transform:skewX(-7deg);color:#b097ff}.brand-dot{color:#a58bff}.navigation,.header-actions{display:flex;align-items:center;gap:31px}.navigation a{font-size:13px;font-weight:650;color:#d3d5e2;transition:color .15s}.navigation a:hover{color:#fff}.header-actions{gap:12px}.header-login{border:0;background:none;color:#fff;padding:10px 14px;font-size:13px;font-weight:700}.button{display:inline-flex;justify-content:center;align-items:center;gap:20px;padding:14px 23px;border-radius:11px;min-height:48px;border:1px solid transparent;font-weight:750;font-size:13px;transition:transform .2s,background .2s,color .2s}.button:hover{transform:translateY(-2px)}.button-primary{background:linear-gradient(120deg,#9574ff,#7054f6);color:white;box-shadow:0 12px 30px #6755ff35}.button-ghost{border-color:#777596;background:#ffffff05;color:white}.button-small{min-height:39px;padding:10px 16px;white-space:nowrap}.mobile-menu-button{display:none;background:transparent;color:white;border:1px solid #6b688b;border-radius:7px;padding:7px 12px}.hero{display:grid;grid-template-columns:1fr 1.05fr;gap:65px;min-height:550px;align-items:center;padding-top:45px;padding-bottom:72px}.eyebrow{font-size:12px;letter-spacing:.11em;font-weight:800;color:#beb5ff;text-transform:uppercase;display:flex;align-items:center;gap:10px}.eyebrow-line{display:inline-block;width:26px;height:2px;background:#a78bff}.hero h1{font-size:clamp(42px,4.6vw,69px);line-height:1.10;letter-spacing:-.064em;margin:26px 0 22px;max-width:650px}.hero h1 em{font-style:normal;background:linear-gradient(105deg,#aea0ff,#a78aff 60%,#d2b9fc);color:transparent;background-clip:text}.hero-description{font-size:16px;line-height:1.83;color:#bbc2dc;max-width:495px}.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:29px}.hero-proof{display:flex;align-items:center;gap:13px;margin-top:44px;font-size:12px;color:#b6bed9}.hero-proof p{margin:0}.hero-proof strong{color:#fff}.proof-icon{display:grid;place-items:center;background:#6858d5;border-radius:50%;height:37px;width:37px;font-size:20px}.hero-visual{min-width:0;position:relative}.visual-top{display:flex;justify-content:space-between;align-items:center;margin:0 0 15px;color:#adadd3;font-size:10px;font-weight:700;letter-spacing:.11em;gap:10px}.visual-status{display:flex;align-items:center;gap:7px;color:#b0a5ff}.status-dot,.mini-dot{display:inline-block;height:7px;width:7px;background:#70d5a7;border-radius:50%}.editor-shell{border:1px solid #4b4d83;border-radius:15px;background:#11162b;box-shadow:0 35px 70px #0007,0 0 35px #7e59df30;padding:0 0 3px;overflow:hidden;transform:perspective(1600px) rotateY(-3deg)}.editor-tabs{display:flex;align-items:center;gap:24px;padding:13px 17px;border-bottom:1px solid #343951;color:#8a92b2;font-size:11px}.window-dots{display:flex;gap:6px}.window-dots span{width:8px;height:8px;background:#ec7276;border-radius:50%}.window-dots span:nth-child(2){background:#f7bd58}.window-dots span:nth-child(3){background:#5dce93}.active-tab{color:#d7caff;border-bottom:2px solid #9574ff;padding-bottom:12px;margin-bottom:-13px}.editor-demo-badge{margin-left:auto;color:#c1b7ee;font-size:10px}.editor-main{display:grid;grid-template-columns:1.38fr .95fr;min-height:275px}.code-view{padding:25px 14px;font-size:12px;line-height:2.65;white-space:nowrap;overflow:auto;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;color:#e5e8f3}.line-no{color:#57617e;display:inline-block;width:30px}.code-violet{color:#b2a1ff}.code-yellow{color:#e6c582}.code-green{color:#90e0ad}.code-muted{color:#8994a9}.output-view{border-left:1px solid #343951;padding:15px;background:#151a30}.output-label{font-size:10px;color:#9aa2c3;letter-spacing:.12em;font-weight:750}.output-card{margin-top:10px;height:211px;background:#fff;color:#151a2d;border-radius:9px;padding:22px 19px;overflow:hidden;position:relative}.output-card h3{font-size:27px;line-height:1.06;letter-spacing:-.055em;margin:15px 0 7px;position:relative;z-index:1}.output-card p{font-size:12px;position:relative;z-index:1}.output-orb{color:#745ee6;font-size:22px}.output-stripe{position:absolute;bottom:-40px;right:-30px;background:linear-gradient(90deg,#e6dfff,#a98cff);border-radius:50%;height:105px;width:175px;transform:rotate(-25deg)}.editor-footer{border-top:1px solid #343951;padding:9px 16px;display:flex;justify-content:space-between;gap:8px;font-size:10px;color:#838aa8}.editor-footer span:first-child{display:flex;align-items:center;gap:7px}.visual-side-note{position:absolute;bottom:-34px;right:10px;font-size:11px;color:#a39bcb}.feature-strip{background:#f7f6ff;border-bottom:1px solid #e7e5f5}.strip-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;padding-block:23px}.strip-grid>span{font-size:19px;color:#775ae4;display:grid;grid-template-columns:24px 1fr;align-items:center;column-gap:8px}.strip-grid strong{color:#262642;font-size:12px}.strip-grid small{grid-column:2;color:#797e98;font-size:11px}.catalog-section{padding-top:100px;padding-bottom:110px}.section-heading{display:flex;justify-content:space-between;gap:30px;align-items:end;margin-bottom:32px}.section-kicker{font-weight:850;font-size:11px;letter-spacing:.13em;color:#7557da}.section-heading h2,.business-section h2{letter-spacing:-.045em;font-size:clamp(31px,3.2vw,45px);margin:13px 0 6px;line-height:1.15}.heading-period{color:#886cff}.section-heading p:not(.section-kicker),.business-section p:not(.section-kicker){color:var(--muted);margin:0}.catalog-filters{display:flex;flex-wrap:wrap;gap:6px;border:1px solid #e7e6ef;padding:5px;border-radius:13px;flex-shrink:0}.filter{border:0;padding:9px 15px;border-radius:9px;background:transparent;font-size:12px;font-weight:700;color:#525a6d}.filter.active{background:#221b48;color:white}.course-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}.course-card{border:1px solid #e6e7f0;background:#fff;border-radius:15px;padding:21px;min-height:243px;display:flex;flex-direction:column;transition:box-shadow .2s,transform .2s}.course-card:hover{box-shadow:0 18px 35px #2e316010;transform:translateY(-3px)}.course-top{display:flex;align-items:start;justify-content:space-between}.course-symbol{height:48px;width:48px;display:grid;place-items:center;border-radius:12px;font-size:20px;font-weight:900}.symbol-html{color:#cf5b33;background:#fff1ea}.symbol-js{color:#735e00;background:#fff5b0}.symbol-python{color:#2666a7;background:#eaf4ff}.symbol-react{color:#3185b8;background:#e7faff}.course-badge{border-radius:99px;padding:4px 10px;font-weight:800;font-size:10px}.badge-free{background:#e7f7ed;color:#137244}.badge-premium{background:#fff2df;color:#956018}.course-card h3{font-size:19px;letter-spacing:-.035em;line-height:1.3;margin:22px 0 5px}.course-card p{font-size:12px;color:#6c7486;margin:0}.course-meta{margin-top:7px;font-size:11px;color:#777e91}.course-link{margin-top:auto;padding-top:23px;border:0;background:transparent;color:#6651d5;text-align:left;font-weight:800;font-size:12px}.course-link span{margin-left:5px}.catalog-disclaimer{font-size:11px;color:#777e92;margin-top:24px}.learning-band{background:#13172d;color:#fff;padding:92px 0}.learning-grid{display:grid;grid-template-columns:1fr 1fr;gap:85px;align-items:center}.section-kicker-light{color:#b4a6ff}.learning-grid h2{font-size:clamp(36px,3.5vw,52px);letter-spacing:-.05em;line-height:1.15;margin:16px 0}.learning-grid>div:first-child>p:not(.section-kicker){color:#b5bdd4;max-width:465px;line-height:1.75}.button-light{background:#fff;color:#36276d;margin-top:18px}.lesson-preview{border:1px solid #4c5075;border-radius:15px;background:#1b213d;box-shadow:0 26px 48px #0004;overflow:hidden}.lesson-preview-top{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:17px;border-bottom:1px solid #444767;font-size:10px;letter-spacing:.08em;font-weight:700;color:#c0c5da}.lesson-preview-top>div{display:flex;background:#12182e;border-radius:9px;padding:3px}.language-tab{border:0;color:#aaaec5;background:transparent;padding:7px 10px;border-radius:7px;font-size:11px;letter-spacing:0;font-weight:750}.language-tab.active{background:#7855ed;color:white}.lesson-preview-body{padding:27px}.lesson-preview-body h3{margin:0;font-size:24px}.lesson-preview-body p{min-height:85px;line-height:1.65;color:#c5cbe0;font-size:14px}.lesson-code{background:#0b1024;border-radius:8px;padding:19px;font-size:12px;color:#a5eac5;font-family:ui-monospace,Consolas,monospace;overflow:auto}.lesson-preview-body small{display:block;color:#9da7c4;margin-top:14px}.business-section{padding-top:100px;padding-bottom:100px;display:grid;grid-template-columns:1fr 1fr;gap:70px;align-items:center}.business-art{min-height:280px;background:radial-gradient(circle at 85% 25%,#a999fe 0%,transparent 40%),linear-gradient(135deg,#f0edff,#d9e2ff);border-radius:20px;padding:28px;display:grid;place-items:center}.business-art-inner{border:1px solid #bab4f5;background:#ffffffa6;border-radius:12px;padding:28px;width:75%;min-height:195px;display:flex;flex-direction:column;justify-content:space-between;box-shadow:0 18px 45px #423f9030}.business-art-inner span{font-size:10px;letter-spacing:.19em;color:#745ece;font-weight:800}.business-art-inner strong{font-size:38px;line-height:1.1;letter-spacing:-.06em;color:#26205c}.footer{background:#0b1024;color:#fff}.footer-inner{padding:65px 0;display:grid;grid-template-columns:2fr 1fr 1fr;gap:45px}.footer-brand{font-size:23px}.footer-inner p{color:#9da5bc;font-size:13px}.footer-inner>div:not(:first-child){display:flex;flex-direction:column;gap:10px}.footer-inner>div:not(:first-child) strong{font-size:12px;margin-bottom:6px}.footer-inner>div:not(:first-child) a{font-size:12px;color:#a9afc4}.footer-bottom{display:flex;justify-content:space-between;gap:20px;border-top:1px solid #303750;padding:22px 0;color:#858eab;font-size:11px}dialog{border:1px solid #dddaf1;border-radius:18px;padding:0;width:min(440px,calc(100% - 40px));box-shadow:0 30px 100px #0006;color:var(--ink)}dialog::backdrop{background:#070b22ad}.dialog-inner{padding:32px;position:relative}.dialog-inner h2{font-size:27px;letter-spacing:-.045em;margin:7px 0 12px}.dialog-message,.dialog-note{color:var(--muted);font-size:13px}.dialog-note{font-size:11px}.dialog-close{position:absolute;right:15px;top:10px;border:0;background:none;font-size:29px;color:#6f7087}.preference-fieldset{display:flex;gap:20px;border:1px solid #e6e5ee;border-radius:11px;margin:22px 0 15px;padding:15px;font-size:13px}.preference-fieldset legend{font-weight:800;padding:0 7px}.preference-fieldset label{display:flex;gap:6px;align-items:center}.dialog-confirm{margin-top:12px;width:100%}
@media(max-width:1050px){.container{width:min(100% - 48px,1180px)}.navigation{gap:17px}.hero{gap:30px}.course-grid{grid-template-columns:repeat(2,1fr)}.learning-grid{gap:40px}}
@media(max-width:760px){.container{width:calc(100% - 36px)}.site-header{min-height:71px;flex-wrap:wrap}.brand{font-size:22px}.mobile-menu-button{display:block;margin-left:auto}.navigation{display:none;flex-basis:100%;order:3;flex-direction:column;align-items:start;padding-bottom:15px;gap:14px}.navigation.open{display:flex}.header-actions{gap:3px}.header-login{padding:9px;font-size:12px}.button-small{padding:8px 11px;font-size:11px}.hero{grid-template-columns:1fr;padding-top:47px;padding-bottom:72px;min-height:0;gap:63px}.hero h1{font-size:clamp(42px,10vw,65px)}.hero-visual{max-width:600px;width:100%}.strip-grid{grid-template-columns:repeat(2,1fr)}.section-heading{align-items:start;flex-direction:column}.catalog-section{padding-top:65px;padding-bottom:75px}.learning-grid,.business-section{grid-template-columns:1fr;gap:32px}.learning-band{padding:66px 0}.business-section{padding-top:70px;padding-bottom:70px}.footer-inner{grid-template-columns:1.5fr 1fr 1fr;gap:20px}.editor-shell{transform:none}}
@media(max-width:470px){.header-actions{order:4;width:100%;justify-content:space-between;padding-bottom:12px}.hero{padding-top:30px}.hero h1{font-size:42px}.hero-actions{flex-direction:column}.hero-actions .button{width:100%}.editor-main{grid-template-columns:1fr}.code-view{min-height:175px;padding:15px 10px;font-size:11px}.output-view{border-left:0;border-top:1px solid #343951}.output-card{height:145px}.output-card h3{font-size:23px;margin:4px 0}.output-stripe{height:65px}.visual-top{font-size:9px}.strip-grid{gap:15px}.course-grid{grid-template-columns:1fr}.catalog-filters{width:100%}.filter{flex:1;padding:8px 10px}.lesson-preview-top{align-items:start;flex-direction:column}.footer-inner{grid-template-columns:1fr 1fr}.footer-inner>div:first-child{grid-column:1/-1}.footer-bottom{flex-direction:column;gap:5px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.button,.course-card{transition:none}.button:hover,.course-card:hover{transform:none}}


/* V2 Unified Sticky Header — global across marketing, catalog, course, lesson and profile. */
.site-header-global{position:sticky;top:0;z-index:1000;width:100%;min-height:0;background:#0b1024;color:#fff;border-bottom:1px solid rgba(180,176,239,.17);box-shadow:0 8px 28px rgba(7,10,24,.16);isolation:isolate}
.site-header-inner{height:76px;display:flex;align-items:center;justify-content:space-between;gap:28px;position:relative}
.site-header-global .brand{font-size:23px;letter-spacing:-.055em;flex-shrink:0;gap:11px}
.site-header-global .brand-mark{width:35px;height:35px;display:grid;place-items:center;font-size:24px;border:0;border-left:6px solid #a18aff;border-radius:9px;background:linear-gradient(145deg,#6043b9,#9d7eff);color:white;padding:0;transform:none;line-height:1;box-shadow:0 0 0 1px #a28cff30}
.site-header-global .site-nav{display:flex;align-items:center;justify-content:center;gap:clamp(13px,1.7vw,27px);margin-left:auto;margin-right:auto}
.site-header-global .site-nav a{color:#bac3df;font-size:12px;font-weight:700;padding:27px 0 23px;white-space:nowrap;border-bottom:2px solid transparent;transition:color .15s,border-color .15s}
.site-header-global .site-nav a:hover,.site-header-global .site-nav a[aria-current="page"]{color:#fff;border-bottom-color:#9b82ff}
.site-header-actions{display:flex;align-items:center;gap:12px;flex-shrink:0}
.site-signin{padding:10px 13px;font-size:12px;font-weight:800;color:#eeeafa;white-space:nowrap}
.site-signup{display:inline-flex;align-items:center;gap:14px;min-height:40px;padding:10px 17px;background:linear-gradient(110deg,#9372ff,#6e50ed);border-radius:10px;color:#fff;font-size:12px;font-weight:850;white-space:nowrap;box-shadow:0 7px 17px #7156e63a}
.site-signup:hover{background:#805ff7}
.site-header-global .mobile-menu-button{display:none;border:1px solid #585278;background:#181936;border-radius:9px;min-height:41px;width:44px;align-items:center;justify-content:center;font-size:20px;padding:3px;color:#eeeaff}
.site-header-global .mobile-menu-button:hover{background:#25214c}
.catalog-page-header,.course-dark-head,.lesson-header-wrap{position:relative}
.site-header-global .site-nav a:focus-visible,.site-header-global .site-signin:focus-visible,.site-header-global .site-signup:focus-visible,.site-header-global button:focus-visible{outline:3px solid #cebaff;outline-offset:4px}
@media(max-width:1100px){.site-header-inner{gap:15px}.site-header-global .site-nav{gap:13px}.site-header-global .site-nav a{font-size:11px}.site-header-global .brand{font-size:21px}.site-signup{padding:10px 12px;gap:8px}}
@media(max-width:980px){
  .site-header-inner{height:68px;gap:12px;flex-wrap:nowrap;justify-content:space-between}
  .site-header-global .site-nav{display:none;position:absolute;top:calc(100% + 1px);left:0;right:0;background:#0e132b;box-shadow:0 18px 28px #0508175c;border:1px solid #383553;border-top:0;border-radius:0 0 14px 14px;margin:0;padding:12px 16px 17px;max-height:calc(100vh - 110px);overflow:auto;flex-direction:column;align-items:stretch;gap:0}
  .site-header-global .site-nav.is-open{display:flex}
  .site-header-global .site-nav a{display:block;padding:12px 9px;border:0;border-radius:7px;font-size:14px}
  .site-header-global .site-nav a:hover,.site-header-global .site-nav a[aria-current="page"]{background:#24204c;color:#fff}
  .site-header-global .mobile-menu-button{display:inline-flex}
  .site-header-actions{margin-left:auto}
}
@media(max-width:560px){
  .site-header-global .brand{font-size:19px}.site-header-global .brand-mark{width:31px;height:31px;font-size:21px}
  .site-header-inner{height:62px;gap:8px}
  .site-header-global .site-signin{display:none}
  .site-signup{min-height:37px;padding:9px 12px;gap:6px;font-size:11px}
  .site-header-global .mobile-menu-button{height:38px;width:40px;min-height:38px}
  .site-header-global .site-nav{max-height:calc(100dvh - 85px)}
}
@media(prefers-reduced-motion:reduce){.site-header-global .site-nav a{transition:none}}

/* On narrow screens the header Login control moves into the menu. */
.site-header-global .site-mobile-login{display:none}
@media(max-width:560px){.site-header-global .site-nav .site-mobile-login{display:block;border-top:1px solid #393554;margin-top:8px;padding-top:16px}}