/* INFORMATYK.EDU.PL — PROTOTYP V02. Stateless UI, no external assets. */
:root {
  --ink:#112039;--navy:#101e35;--navy-deep:#0a1729;--blue:#2866ee;--blue-dark:#1853d1;
  --muted:#64738c;--muted-light:#8b98ac;--line:#e4eaf2;--mist:#f6f8fc;
  --paper:#fff;--ice:#eaf3ff;--cyan:#a5deff;--lilac:#efedff;--teal:#dff6f0;
  --shadow:0 32px 65px -36px rgba(27,52,100,.24);--radius:20px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:96px}
body{margin:0;background:#fff;color:var(--ink);font-family:Inter,"Segoe UI","Helvetica Neue",Arial,sans-serif;line-height:1.5;-webkit-font-smoothing:antialiased}
button,input,select{font:inherit}button{cursor:pointer}button:disabled{cursor:default}a{text-decoration:none;color:inherit}img,svg{display:block;max-width:100%}p,h1,h2,h3{margin-top:0}h1,h2,h3{line-height:1.15}section{min-width:0}[hidden]{display:none!important}
.container{width:min(100% - 88px,1250px);margin-inline:auto}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
:focus-visible{outline:3px solid #6dbbff;outline-offset:4px}::selection{background:#2866ee;color:#fff}
.skip-link{position:fixed;top:-120px;left:15px;background:#fff;color:#0e203c;padding:13px 18px;border:2px solid #2b67ea;border-radius:10px;z-index:1000}.skip-link:focus{top:12px}
.preview-banner{height:34px;background:#101e34;color:#a9bad0;font-weight:760;font-size:10px;letter-spacing:1.3px}
.preview-banner__inner{height:100%;display:flex;align-items:center;justify-content:space-between;gap:20px}.preview-banner__inner>span:first-child{color:#d6e7ff;display:flex;align-items:center;gap:10px;white-space:nowrap}.preview-separator{color:#7287a4}.preview-secondary{font-size:10px;font-weight:550;color:#8fa2be;letter-spacing:.4px}
.status-dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:#62e0b9;box-shadow:0 0 0 3px rgba(98,224,185,.12)}
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.97);border-bottom:1px solid #edf0f5;backdrop-filter:blur(15px)}
.header-grid{display:flex;align-items:center;min-height:86px;gap:25px}.brand{display:inline-flex;align-items:center;gap:12px;white-space:nowrap;flex:0 0 auto}.brand-symbol{width:43px;height:43px;display:grid;place-items:center}.brand-symbol svg{width:43px;height:43px}.brand-type{font-size:19.5px;font-weight:870;letter-spacing:-.95px;line-height:1.15;color:#13233b}.brand-type>span{color:#2866ee}.brand-type small{display:block;margin-top:4px;font-size:8.8px;font-weight:760;letter-spacing:1.05px;text-transform:uppercase;color:#8c9ab0}
.desktop-nav{display:flex;align-items:center;justify-content:center;gap:27px;margin-left:auto}.nav-item{font-size:12.3px;color:#526179;font-weight:730;white-space:nowrap;position:relative;padding:9px 0;transition:color .16s}.nav-item:hover,.nav-item.is-current{color:var(--blue)}.desktop-nav .nav-item.is-current::after{content:"";position:absolute;height:2px;background:#2866ee;bottom:2px;left:0;right:0;border-radius:3px}
.header-tools{display:flex;align-items:center;gap:12px}.icon-button{height:43px;width:43px;display:grid;place-items:center;background:#f7f9fc;border:1px solid #e5ebf3;border-radius:11px;color:#334862;transition:color .2s,background .2s}.icon-button:hover{color:#2866ee;background:#eaf2ff}
.button{display:inline-flex;align-items:center;justify-content:center;gap:22px;min-height:54px;padding:14px 20px;border-radius:11px;font-size:12.5px;font-weight:830;white-space:nowrap;border:1px solid transparent;transition:background .22s,color .22s,box-shadow .22s,transform .22s}.button:hover{transform:translateY(-2px)}.button svg{flex:0 0 18px;transition:transform .2s}.button:hover svg{transform:translate(2px,-2px)}.button--primary{background:var(--blue);color:#fff;box-shadow:0 14px 29px rgba(40,102,238,.17)}.button--primary:hover{background:#1554d8;box-shadow:0 16px 33px rgba(40,102,238,.26)}.button--dark{background:#111f36;color:#fff}.button--dark:hover{background:#2358bd}.button--light{background:#3576f1;color:#fff}.button--light:hover{background:#4881fb}.button--white{background:#fff;color:#1c4dbe}.button--white:hover{background:#eaf2ff}.button--outline{background:#fff;color:#18283f;border-color:#dde5f0}.button--outline:hover{border-color:#93b7ee;color:#1957c8}.button--ghost{background:transparent;border-color:#dce5f1;color:#273951}.button--ghost:hover{background:#f2f6ff;border-color:#b9d4ff}
.header-button{min-height:43px;padding:12px 15px;border-radius:10px;gap:13px}.header-button svg{width:16px;height:16px}.menu-toggle,.mobile-menu{display:none}
/* hero */
.hero{background:linear-gradient(106deg,#fff 0%,#fbfdff 44%,#eff5ff 100%);position:relative;overflow:hidden}.hero-grid-bg{position:absolute;right:-40px;top:-10px;width:47%;height:100%;background-image:linear-gradient(rgba(58,110,195,.042) 1px,transparent 1px),linear-gradient(90deg,rgba(58,110,195,.042) 1px,transparent 1px);background-size:42px 42px;mask-image:linear-gradient(90deg,transparent,#000);pointer-events:none}
.hero-layout{display:grid;grid-template-columns:51% 49%;align-items:center;gap:0;min-height:670px;padding-top:55px;padding-bottom:45px;position:relative;z-index:2}
.hero-text{position:relative;z-index:4;max-width:665px;padding-bottom:22px}.eyebrow{display:inline-flex;align-items:center;gap:10px;font-size:10px;font-weight:860;letter-spacing:1.34px}.eyebrow--blue{border-radius:100px;border:1px solid #dde9ff;background:#f0f6ff;color:#2764d6;padding:10px 14px}.eyebrow-spark{font-size:16px;line-height:10px}
.hero h1{font-size:clamp(49px,5vw,74px);font-weight:870;letter-spacing:-3.6px;line-height:1.13;color:#101f36;margin:26px 0 26px;white-space:nowrap}.hero h1 span{color:#2866ed}.hero-description{font-size:16.3px;line-height:1.8;color:#65748a;max-width:495px;margin-bottom:0}.hero-actions{display:flex;gap:13px;flex-wrap:wrap;align-items:center;margin-top:34px}.hero-trust{margin-top:48px;display:flex;gap:12px;align-items:center}.hero-trust__symbol{width:39px;height:39px;display:grid;place-items:center;color:#176bc6;font-size:16px;font-weight:850;background:#ecf4ff;border:1px solid #d9e8ff;border-radius:12px}.hero-trust b{display:block;font-size:11.8px;color:#33445e}.hero-trust span{display:block;font-size:11px;color:#8896ab;margin-top:3px}
.hero-demo{min-height:515px;display:grid;place-items:center;position:relative;isolation:isolate;transform:translateX(12px)}.hero-demo__halo{position:absolute;z-index:-1;width:530px;height:530px;top:-15px;left:6%;border-radius:50%;background:radial-gradient(circle,rgba(107,159,245,.23),rgba(211,230,255,.1) 50%,transparent 70%)}
.practice-window{width:min(100%,535px);border:1px solid #273b58;background:#101e35;border-radius:18px;color:#fff;box-shadow:0 30px 78px rgba(18,40,82,.28);overflow:hidden;transform:rotate(-2deg);transition:transform .5s}.hero-demo:hover .practice-window{transform:rotate(0)}
.practice-window__header{min-height:48px;padding:0 18px;border-bottom:1px solid #2a3b55;background:#172840;display:flex;align-items:center;gap:16px;color:#8399b9;font-size:10px;letter-spacing:.3px}.practice-window__header>span:nth-child(2){margin-inline:auto}.window-dots{display:flex;gap:5px}.window-dots i{width:7px;height:7px;border-radius:50%;background:#f58c8e}.window-dots i:nth-child(2){background:#f2bd71}.window-dots i:nth-child(3){background:#53c99a}.window-badge{font-size:9px;letter-spacing:1.1px;color:#81e6b5;font-weight:840;white-space:nowrap}
.practice-window__main{padding:26px 30px 26px}.window-eyebrow{display:flex;justify-content:space-between;gap:10px;font-size:9px;letter-spacing:1.17px;color:#9fbedf;font-weight:840}.window-progress{height:4px;margin:14px 0 24px;background:#2b3d55;border-radius:9px;overflow:hidden}.window-progress i{display:block;width:33%;height:100%;background:#53b5ff;border-radius:9px}.window-question-meta{display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:10px;color:#91a4bd}.question-topic{color:#81bfff;font-weight:830;letter-spacing:1.1px}.question-type{font-size:9px}.practice-window h2{font-size:22.6px;letter-spacing:-.7px;line-height:1.34;margin:17px 0 20px;font-weight:800}.practice-window h2 span{color:#89c7ff}.home-answers{display:grid;gap:8px}.home-answer{display:flex;align-items:center;gap:11px;text-align:left;min-height:51px;border:1px solid #2d405d;border-radius:9px;background:#192b45;padding:9px 11px;color:#c5d5ea;font-size:11.3px;transition:border .16s,background .16s}.home-answer:hover:not(:disabled){background:#263b59;border-color:#6fb8ff}.home-answer>b{display:grid;place-items:center;flex:0 0 29px;height:29px;border-radius:7px;background:#2d405e;color:#acc5e8;font-size:11px}.home-answer>span:nth-child(2){flex:1}.answer-ring{width:15px;height:15px;flex:0 0 15px;border-radius:50%;border:1px solid #607995}.home-answer.is-correct{background:#174339;border-color:#55c6a6;color:#edfff9}.home-answer.is-correct>b{background:#248a72;color:#fff}.home-answer.is-wrong{background:#4a303f;border-color:#de8497}.home-answer.is-wrong>b{background:#955b6a;color:#fff}.home-answer:disabled{opacity:1}.home-answer.is-correct .answer-ring{background:#51d2a0;border-color:#51d2a0;box-shadow:inset 0 0 0 3px #174339}.home-answer.is-wrong .answer-ring{background:#ed7d8c;border-color:#ed7d8c}
.home-demo-feedback{display:flex;align-items:center;justify-content:space-between;gap:10px;min-height:28px;margin-top:16px}.home-demo-feedback p{font-size:10px;line-height:1.45;margin:0;color:#91a6c1}.home-demo-feedback p.correct{color:#7ae3b5}.home-demo-feedback p.wrong{color:#ffaab9}.home-demo-feedback button{border:0;background:none;color:#8ac4ff;font-size:11px;font-weight:750;white-space:nowrap}.home-demo-feedback button:hover{color:#fff}
.floating-fact{position:absolute;z-index:5;background:#fff;border:1px solid #ebeff6;box-shadow:0 14px 44px rgba(27,49,94,.16);border-radius:14px;padding:11px 15px 11px 11px;display:flex;align-items:center;gap:11px}.floating-fact--top{right:-16px;top:24px;transform:rotate(7deg)}.floating-fact--bottom{left:-35px;bottom:13px;transform:rotate(4deg)}.floating-fact__icon,.floating-fact__check{display:grid;place-items:center;height:33px;width:33px;border-radius:10px;background:#ebf3ff;color:#2866ee;font-size:20px}.floating-fact__check{background:#e1f9ed;color:#16855c;font-size:18px}.floating-fact b{font-size:10.3px;display:block;color:#243451}.floating-fact small{font-size:9px;color:#7b8da5;display:block;margin-top:2px}
.hero-bottom{display:flex;align-items:center;justify-content:space-between;gap:18px;padding-bottom:22px;font-size:9.2px;letter-spacing:1.35px;color:#9aa7b8;font-weight:850}.hero-bottom b{font-size:18px;color:#2866ed;vertical-align:-3px;padding-left:10px}
/* quick nav */
.quick-nav{background:#0f1e35;color:#fff}.quick-grid{display:grid;grid-template-columns:repeat(4,1fr)}.quick-grid>a{position:relative;min-height:102px;display:flex;align-items:center;gap:13px;padding:17px 14px 17px 0;transition:background .2s,transform .2s}.quick-grid>a:not(:last-child)::after{content:"";position:absolute;right:14px;height:37px;width:1px;background:#2c3e5b}.quick-grid>a:hover{transform:translateY(-3px)}.quick-number{color:#5e779a;font-size:9px;font-weight:860;align-self:center}.quick-icon{width:35px;height:35px;display:grid;place-items:center;border-radius:10px;flex:0 0 35px}.quick-icon svg{width:17px;height:17px}.quick-icon--blue{background:#1f4785;color:#9cc9ff}.quick-icon--violet{background:#46406d;color:#d8c7ff}.quick-icon--mint{background:#26565a;color:#9be7d2}.quick-icon--peach{background:#624439;color:#ffcfb1}.quick-content b{font-size:11.4px;display:block;white-space:nowrap}.quick-content small{font-size:10px;color:#95a5c0;display:block;margin-top:5px;white-space:nowrap}
/* sections & cards */
.section{padding:111px 0}.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:60px;margin-bottom:39px}.section-head>div{flex:1 1 auto}.section-head>p{max-width:346px;margin:0 0 7px;color:#77859b;font-size:13.2px;line-height:1.9}.section-overline{display:inline-flex;align-items:center;gap:10px;color:#2768d9;font-size:10px;font-weight:880;letter-spacing:1.35px}.section-overline i{width:22px;height:2px;background:#3374e7;display:block;border-radius:3px}.section-head h2,.faq-intro h2{margin:20px 0 0;font-size:clamp(38px,3.65vw,52px);font-weight:850;letter-spacing:-2.4px;line-height:1.18}.section-head h2 span,.faq-intro h2 span{color:#7c899d}.qualifications{background:#fff}.qualification-grid{display:grid;grid-template-columns:1fr 1fr;gap:21px}.qualification-card{overflow:hidden;border-radius:21px;position:relative;min-height:405px;border:1px solid transparent;display:flex;flex-direction:column}.qualification-card--02{background:#e9f3ff;border-color:#dfeafe}.qualification-card--03{background:#f0ecff;border-color:#e9e1ff}.qual-card__top{padding:27px 30px 0;display:flex;justify-content:space-between;align-items:center;font-size:9px;font-weight:860;letter-spacing:1.12px;color:#5e85b5}.qualification-card--03 .qual-card__top{color:#8875b6}.qual-card__top span{display:inline-flex;align-items:center;gap:7px}.qual-card__top i{height:6px;width:6px;border-radius:100%;background:#2866ee}.qualification-card--03 .qual-card__top i{background:#7c5fda}.qual-card__body{flex:1;display:flex;align-items:center;position:relative;min-height:292px;padding:10px 30px 28px}.qual-card__copy{position:relative;z-index:2;width:min(66%,370px)}.qual-big{display:block;color:#2967cd;font-size:40px;font-weight:900;letter-spacing:-2px;line-height:1;margin:16px 0 12px}.qualification-card--03 .qual-big{color:#7656d2}.qual-card__copy h3{font-size:27px;letter-spacing:-1.1px;line-height:1.19;margin:0 0 10px;font-weight:830}.qual-card__copy p{max-width:318px;color:#61738e;font-size:12px;line-height:1.7;margin-bottom:14px}.tag-list{display:flex;flex-wrap:wrap;gap:6px}.tag-list span{font-size:9.4px;font-weight:760;color:#567ba6;background:rgba(255,255,255,.65);border:1px solid #d3e2f7;border-radius:6px;padding:6px 9px}.qualification-card--03 .tag-list span{color:#8065ba;border-color:#e1d6f9}.qual-card__footer{display:flex;align-items:center;justify-content:space-between;gap:12px;border-top:1px solid rgba(84,125,195,.2);margin:0 30px;padding:17px 0 21px;font-size:11px;font-weight:850;color:#1f509f}.qual-card__footer>a:first-child{display:inline-flex;align-items:center;gap:9px}.qual-card__footer svg{width:15px;height:15px}.qual-card__footer a:hover{color:#003c9c}.qual-details{font-size:10.5px;color:#65819f;font-weight:750}.qualification-card--03 .qual-card__footer{border-color:rgba(113,86,178,.22);color:#6041a8}.qualification-card--03 .qual-details{color:#9180b4}
.qual-diagram{position:absolute;z-index:0;pointer-events:none;right:8px;top:23px;width:240px;height:230px}.qual-diagram--network{opacity:.88}.net-center{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:61px;height:61px;display:grid;place-items:center;background:#2866ed;border-radius:17px;color:#fff;font-size:19px;font-weight:850;box-shadow:0 10px 26px #2e6de23c}.net-orbit{position:absolute;inset:23px;border-radius:50%;border:1px solid #a5c7fa}.net-orbit--two{inset:47px;border-style:dashed}.net-node{position:absolute;display:grid;place-items:center;width:29px;height:29px;border-radius:10px;border:1px solid #bad6fb;background:#fff;color:#3e80df;font-size:15px;box-shadow:0 5px 17px #2866ed13}.net-node.n1{top:8px;left:102px}.net-node.n2{top:99px;right:0}.net-node.n3{bottom:8px;left:105px}.net-node.n4{top:103px;left:0}.qual-diagram--code{width:231px;height:194px;border-radius:14px;background:#fff;box-shadow:0 19px 38px #49328f17;top:68px;right:-38px;border:1px solid #e0d8fa;transform:rotate(4deg);overflow:hidden;padding:23px}.mock-code__bar{height:22px;border-bottom:1px solid #eee9fe;margin:-23px -23px 21px;padding:8px 10px;display:flex;gap:4px;background:#d7caff}.mock-code__bar i{width:5px;height:5px;border-radius:50%;background:#ab98e6}.mock-code__line{height:6px;background:#e4ddf7;border-radius:4px;margin-bottom:12px}.mock-code__line.long{width:75%}.mock-code__line.short{width:42%;background:#8c75e8}.mock-code__line.medium{width:64%}.mock-code__line.med-blue{width:51%;background:#b7bdff}.mock-code__symbol{display:grid;place-items:center;position:absolute;bottom:13px;right:13px;width:50px;height:50px;background:#e1d9ff;border-radius:9px;color:#8268dc;font-size:18px;font-weight:900}
/* Learning panel */
.learning-section{background:#0e1c32;padding:111px 0;overflow:hidden;position:relative}.learning-section::before{content:"";position:absolute;width:720px;height:720px;left:-490px;top:-260px;border-radius:50%;border:1px solid #ffffff12;box-shadow:0 0 0 85px #ffffff07,0 0 0 170px #ffffff04}.learning-grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:115px;align-items:center;position:relative;z-index:1}.section-overline--light{color:#82c0ff}.section-overline--light i{background:#67b7ff}.learning-intro h2{color:#fff;font-size:clamp(42px,4vw,56px);letter-spacing:-2.35px;line-height:1.14;margin:20px 0}.learning-intro h2 span{color:#85c3ff}.learning-intro p{color:#a4b3ca;font-size:13.3px;line-height:1.95;max-width:420px;margin-bottom:26px}.learning-detail{display:flex;align-items:center;gap:13px;margin-top:35px;max-width:350px;color:#7e93b0;font-size:10px;line-height:1.65}.learning-detail__star{color:#8ec6ff;font-size:24px}.learning-steps{overflow:hidden;border:1px solid #30415e;background:#132640;border-radius:19px;box-shadow:0 20px 42px #050d1b33}.learning-step{display:grid;grid-template-columns:45px 1fr 20px;gap:9px;padding:25px 25px;border-bottom:1px solid #2c405d;align-items:start}.learning-step:last-child{border-bottom:0}.step-index{color:#70b6fc;font-weight:870;font-size:15px;letter-spacing:.3px}.step-label{color:#667f9e;font-size:9px;letter-spacing:1.4px;font-weight:800}.learning-step h3{color:#edf5ff;font-size:17.5px;line-height:1.3;margin:5px 0 6px;letter-spacing:-.35px}.learning-step p{margin:0;color:#97a9c1;font-size:11.5px;line-height:1.65}.step-arrow{font-size:15px;color:#53799e}
/* Article cards */
.materials-section{background:#f7f9fd}.materials-tools{display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap;margin-bottom:22px}.filter-row,.library-categories{display:flex;gap:7px;flex-wrap:wrap}.filter-button,.library-filter{display:inline-flex;align-items:center;gap:11px;padding:12px 16px;font-size:11px;font-weight:830;color:#697891;background:#fff;border:1px solid #e4ebf4;border-radius:8px;transition:color .2s,background .2s,border .2s}.filter-button span{font-size:9px;color:#a8b3c1}.filter-button:hover,.library-filter:hover{color:#1a5dd0;border-color:#aacaf9}.filter-button.active,.library-filter.active{color:#fff;background:#2866ee;border-color:#2866ee;box-shadow:0 9px 18px #2866ee23}.filter-button.active span{color:#c7ddff}.text-link{display:inline-flex;align-items:center;gap:10px;color:#275fcb;font-weight:830;font-size:11px}.text-link:hover{color:#153d90}.text-link svg{width:17px}
.articles-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.article-card{min-width:0;background:#fff;border:1px solid #e6ebf4;border-radius:16px;overflow:hidden;transition:transform .25s,box-shadow .25s,border-color .25s}.article-card:hover{transform:translateY(-5px);box-shadow:0 17px 36px rgba(35,58,99,.10);border-color:#d9e3f3}.article-link{display:block;height:100%}.article-art{position:relative;height:173px;overflow:hidden;display:grid;place-items:center}.article-art__label{position:absolute;z-index:2;left:19px;top:17px;color:#456b98;font-size:9px;font-weight:850;letter-spacing:1.25px}.article-art__arrow{position:absolute;right:16px;top:13px;display:grid;place-items:center;background:#ffffffb9;width:29px;height:29px;border-radius:50%;color:#4269a4}.article-art__arrow svg{width:16px;height:16px}
.article-art--ip{background:#dcecff}.article-art--python{background:#122a4a}.article-art--python .article-art__label{color:#a7c7ef}.article-art--python .article-art__arrow{background:#345273;color:#eaf4ff}.article-art--osi{background:#e9e3ff}.article-art--osi .article-art__label{color:#7866ae}.article-art--bios{background:#ffece0}.article-art--router{background:#dff2ed}.article-art--dns{background:#e1eaff}.article-art--dhcp{background:#dff0ff}.article-art--variables{background:#e9ebfa}.article-art--variables .article-art__label{color:#6c6e9a}
.visual-ip{position:relative;width:225px;text-align:center}.vis-ip-main{background:#fff;color:#2767d1;border:1px solid #aacbff;display:inline-flex;gap:14px;align-items:center;padding:10px 12px;font-size:18px;transform:rotate(-6deg);border-radius:7px;box-shadow:0 10px 16px #4081d117;font-weight:850}.vis-ip-main span{background:#2e6ce5;color:#fff;border-radius:5px;font-size:13px;padding:5px}.vis-ip-line{height:22px;width:1px;display:block;background:#83b4ef;margin:5px auto}.vis-ip-nodes{display:flex;justify-content:space-between}.vis-ip-nodes i{font-size:10px;font-style:normal;color:#628bb8;font-weight:800;padding:5px 8px;border:1px solid #b8d4f6;border-radius:7px;background:#fff9}
.visual-python{width:78%;max-width:280px;background:#0d1c32;border:1px solid #3d567c;transform:rotate(-4deg);box-shadow:0 15px 30px #0002;border-radius:9px;padding:25px 18px 18px;color:#d0e4ff;font:12px/2 Consolas,monospace}.visual-python>span{display:block;white-space:nowrap}.visual-python i{color:#e2a3f9;font-style:normal}.visual-python b{color:#81b5ff}.visual-python em{color:#ffc783;font-style:normal}.visual-python .term-cursor{color:#fff}
.visual-osi{display:flex;gap:6px;transform:rotate(-7deg);align-items:center}.visual-osi span{display:grid;place-items:center;width:30px;height:48px;border-radius:6px;color:#fff;font-weight:850;font-size:12px;background:#765be0;box-shadow:0 9px 13px #654acd36}.visual-osi span:nth-child(2n){transform:translateY(-10px);background:#aa93f4}.visual-osi span:nth-child(3n){transform:translateY(7px)}
.visual-bios{width:175px;height:116px;background:#fff;border:2px solid #edc6a8;transform:rotate(-8deg);box-shadow:0 13px 28px #bd946c33;position:relative;padding:21px 15px}.bios-chip{display:block;color:#aa6437;font-size:17px;font-weight:900;letter-spacing:3px}.bios-lines i{display:block;background:#f1dbcd;width:80%;height:5px;border-radius:6px;margin-top:8px}.bios-lines i:nth-child(2){width:55%}.bios-lines i:nth-child(3){width:67%}.bios-corner{position:absolute;right:10px;bottom:9px;font-size:10px;color:#bf8c66;font-weight:850}
.visual-router{position:relative;width:190px;height:110px;margin-top:40px;transform:rotate(-7deg)}.antenna{position:absolute;bottom:53px;width:5px;height:67px;background:#294d60;border-radius:4px;transform-origin:bottom}.ant-left{left:30px;transform:rotate(-19deg)}.ant-right{right:35px;transform:rotate(17deg)}.router-box{position:absolute;bottom:15px;width:100%;height:62px;background:#234c50;border-radius:14px;box-shadow:0 12px 5px #233d4530;display:flex;align-items:flex-end;gap:8px;padding:0 17px 18px}.router-box i{height:6px;width:6px;border-radius:50%;background:#80ead0}.router-box i:nth-child(2){background:#fff6b2}.router-signal{position:absolute;right:-23px;top:-5px;color:#5c9e8a;font-weight:800;transform:rotate(70deg);font-size:18px}
.visual-variables{background:#1b284e;transform:rotate(-5deg);border-radius:9px;padding:18px 20px;width:230px;color:#e7ecff;box-shadow:0 17px 30px #3f497a42;font:12px/2.15 Consolas,monospace}.visual-variables span{display:block;white-space:nowrap}.visual-variables b{color:#8899f2}.visual-variables i{font-style:normal;color:#9be6d7}.visual-variables em{font-style:normal;color:#fbc27c}.visual-variables strong{color:#b5a6ff}
.visual-dns{display:flex;flex-direction:column;align-items:center;gap:6px;transform:rotate(-5deg)}.visual-dns span{font-size:15px;font-weight:800;color:#305fa6;background:#fff;border:1px solid #bad0f4;border-radius:7px;padding:8px 15px}.visual-dns span:last-child{background:#4f73cd;color:#fff}.visual-dns b{font-size:16px;color:#467bd6}.visual-dhcp{width:190px;display:flex;justify-content:space-between;align-items:center;position:relative;transform:rotate(-4deg)}.dhcp-server{padding:12px;background:#1c548a;border-radius:8px;color:#fff;font-size:15px;font-weight:900}.dhcp-server span{display:block;font-size:8px;font-weight:800;letter-spacing:1px;color:#aad5ff}.dhcp-path{height:3px;width:38px;background:repeating-linear-gradient(90deg,#4e8bbd 0 6px,transparent 6px 12px)}.dhcp-client{border:2px solid #5798cd;background:#fff;color:#3475b2;border-radius:7px;padding:14px 11px;font-size:14px;font-weight:850}
.article-body{padding:22px 23px 21px}.article-meta{display:flex;gap:11px;align-items:center;color:#8b9aaf;font-size:9px;font-weight:810;letter-spacing:.6px}.article-meta>span:first-child{color:#2866ee}.article-body h3{font-size:18px;line-height:1.33;letter-spacing:-.48px;font-weight:820;min-height:48px;margin:10px 0 8px}.article-body p{color:#748299;font-size:11.5px;line-height:1.7;margin-bottom:17px;min-height:40px}.article-more{display:flex;align-items:center;justify-content:space-between;border-top:1px solid #edf0f6;padding-top:15px;color:#255ec8;font-size:11px;font-weight:840}.article-more>span{font-size:17px}
.materials-bottom{margin-top:20px;display:flex;align-items:center;gap:16px;padding:15px 20px;border:1px solid #e5ebf3;border-radius:12px;background:#fff}.materials-bottom__icon{font-size:24px;color:#3779e9}.materials-bottom p{flex:1;margin:0;color:#76849a;font-size:11.6px;line-height:1.7}.materials-bottom a{font-size:11px;font-weight:810;color:#2866d6;white-space:nowrap;display:inline-flex;gap:10px;align-items:center}.materials-bottom svg{width:15px}
/* CTA and faq */
.cta-section{padding:5px 0 97px;background:#f7f9fd}.cta-card{border-radius:19px;min-height:360px;overflow:hidden;background:linear-gradient(115deg,#285ed7,#2053bc 70%,#17439c);position:relative;color:#fff;display:flex;align-items:center}.cta-content{z-index:2;position:relative;padding:60px 70px;max-width:780px}.cta-content h2{font-size:clamp(35px,3.4vw,47px);letter-spacing:-1.9px;line-height:1.15;margin:17px 0}.cta-content p{max-width:500px;color:#d4e4ff;font-size:12.5px;line-height:1.85;margin-bottom:24px}.cta-card__decor{position:absolute;right:30px;top:0;bottom:0;width:370px;display:grid;place-items:center}.cta-orbit{position:absolute;width:300px;height:300px;border:1px dashed #ffffff32;border-radius:50%}.cta-orbit--inner{width:205px;height:205px}.cta-code{display:grid;place-items:center;width:100px;height:100px;background:#fff;border-radius:23px;color:#245ee3;font-size:31px;font-weight:950;transform:rotate(-11deg);box-shadow:0 18px 40px #152b7333}.cta-dot{position:absolute;display:grid;place-items:center;background:#7aa8ff;border-radius:50%;font-size:10px;font-weight:810;width:38px;height:38px}.cta-dot--one{top:55px;left:110px}.cta-dot--two{right:21px;top:160px}.cta-dot--three{bottom:52px;left:113px}
.faq-section{padding:102px 0 117px;background:#fff}.faq-layout{display:grid;grid-template-columns:.8fr 1.2fr;gap:120px;align-items:start}.faq-intro h2{font-size:clamp(37px,3.3vw,50px)}.faq-intro p{font-size:13px;color:#758399;max-width:290px;line-height:1.9;margin-top:18px}.faq-list{border-top:1px solid #dfe6ef}.faq-list details{border-bottom:1px solid #dfe6ef}.faq-list summary{display:flex;align-items:center;justify-content:space-between;gap:15px;cursor:pointer;list-style:none;padding:25px 2px 25px 0;font-weight:800;font-size:14px;line-height:1.5;color:#1b2d47}.faq-list summary::-webkit-details-marker{display:none}.faq-list summary span{display:grid;place-items:center;color:#316de4;background:#eef4ff;border-radius:50%;width:28px;height:28px;flex:0 0 28px;font-size:20px;font-weight:500;transition:transform .2s}.faq-list details[open] summary span{transform:rotate(45deg)}.faq-list details p{font-size:12.5px;color:#697991;line-height:1.85;margin:-9px 45px 24px 0}
/* Footer */
.footer{background:#0e1b30;color:#aabbd2}.footer-main{padding:63px 0 60px;display:grid;grid-template-columns:1.65fr .75fr .95fr 1.05fr;gap:55px}.brand--footer .brand-type{color:#fff}.brand--footer .brand-type small{color:#748aa8}.footer-brand p{font-size:11.5px;line-height:1.86;max-width:285px;margin:20px 0;color:#8296b2}.foot-demo{font-size:9px;letter-spacing:1px;font-weight:800;color:#6591c1}.footer-column{display:flex;flex-direction:column;align-items:flex-start;gap:12px}.footer-column h2{font-size:11.2px;color:#f1f5ff;margin:2px 0 11px;letter-spacing:.3px}.footer-column>a{font-size:11px;color:#96a9c1}.footer-column>a:hover{color:#fff}.footer-column p{font-size:11px;line-height:1.85;margin:0 0 4px;color:#8297b2}.footer-column--last>a{display:inline-flex;align-items:center;gap:8px;color:#d6e6fb;font-weight:780}.footer-column--last svg{width:16px}.footer-bottom{display:flex;align-items:center;justify-content:space-between;gap:18px;border-top:1px solid #293954;padding:18px 0 23px;color:#7589a4;font-size:9.8px}.footer-bottom a{color:#aac7e5;font-weight:750}
/* Search UI */
.search-overlay{position:fixed;inset:0;z-index:300;display:grid;place-items:start center;padding:14vh 18px 20px}.search-shade{background:#081529bb;position:absolute;inset:0;backdrop-filter:blur(6px)}.search-dialog{position:relative;z-index:1;width:min(100%,640px);border:1px solid #dbe4f0;border-radius:17px;overflow:hidden;background:#fff;box-shadow:0 42px 120px #040b1966}.search-dialog__head{display:flex;justify-content:space-between;align-items:center;padding:17px 24px;border-bottom:1px solid #e4eaf3}.search-dialog__head>span{font-size:12px;font-weight:850}.search-close{border:1px solid #e0e6ef;border-radius:7px;background:#f6f8fc;color:#687a94;padding:6px 10px;font-size:10px;font-weight:750}.search-dialog form{position:relative;display:flex;align-items:center;gap:9px;padding:17px 23px;border-bottom:1px solid #eef2f7}.search-form-icon{color:#2866e9}.search-dialog input{flex:1;min-width:0;border:none;outline:none;font-size:15px;color:#17283f}.search-dialog form button{border:0;background:#2866ee;color:white;font-weight:820;font-size:11px;border-radius:8px;padding:11px 13px;display:flex;align-items:center;gap:5px}.search-dialog form button svg{width:15px}.search-helper{font-size:9.5px;color:#92a0b3;letter-spacing:1.15px;font-weight:860;margin:17px 24px 9px}.search-suggestions{padding:0 11px 12px}.search-suggestions a{display:flex;justify-content:space-between;align-items:center;padding:12px 13px;border-radius:9px;font-size:12px;font-weight:750;color:#30455f}.search-suggestions a:hover{background:#f0f5fd;color:#2866ee}.search-suggestions a span{color:#8296b0}.search-foot{text-align:center;padding:11px 0;border-top:1px solid #edf1f7;font-size:10px;color:#94a2b6;margin:0}
/* Secondary pages */
.subhero{background:#101f38;color:#fff;overflow:hidden;position:relative}.subhero::after{content:"";position:absolute;width:540px;height:540px;border-radius:50%;border:1px solid #6f9fe318;box-shadow:0 0 0 80px #6f9fe308,0 0 0 160px #6f9fe305;right:-135px;top:-260px;pointer-events:none}.subhero-grid{position:relative;z-index:1;min-height:318px;padding:73px 0 68px;display:grid;grid-template-columns:1.15fr .85fr;gap:60px;align-items:center}.subhero h1{font-size:clamp(49px,5vw,72px);letter-spacing:-3.6px;line-height:1.1;margin:20px 0 0}.subhero h1 span{color:#88bdff}.subhero-side{padding-top:43px}.subhero-side p{max-width:465px;font-size:14px;color:#b0c1d8;line-height:1.9;margin:0 0 23px}.subhero-tags{display:flex;gap:7px;flex-wrap:wrap}.subhero-tags span{display:inline-flex;padding:8px 11px;font-size:10px;font-weight:850;letter-spacing:.5px;color:#bcd4f3;background:#233957;border:1px solid #395472;border-radius:6px}
/* Exam page */
.exam-section{background:#f7f9fc;padding:36px 0 110px}.demo-notice{background:#eaf2ff;border:1px solid #d8e7fd;display:flex;align-items:flex-start;gap:13px;padding:15px 18px;border-radius:11px;margin:0 0 23px}.demo-notice__icon{width:22px;height:22px;flex:0 0 22px;background:#cfe1ff;color:#265ec4;border-radius:50%;display:grid;place-items:center;font-size:12px;font-weight:850}.demo-notice p{font-size:11.8px;color:#526c90;line-height:1.7;margin:0}.demo-notice b{color:#264e85}.exam-layout{display:grid;grid-template-columns:minmax(0,1fr) 304px;gap:24px;align-items:start}.exam-panel{border:1px solid #e3e9f2;background:#fff;border-radius:18px;overflow:hidden;box-shadow:0 19px 48px -35px #17325952}.exam-setup{padding:28px 34px 0}.exam-setup__header{display:flex;justify-content:space-between;gap:10px;margin-bottom:15px}.exam-overline{font-size:9.7px;font-weight:870;letter-spacing:1px;color:#7d8ea5}.exam-qual-tabs{display:grid;grid-template-columns:1fr 1fr;gap:12px}.exam-qual{display:flex;align-items:center;gap:12px;text-align:left;border-radius:11px;border:1px solid #e2e8f1;background:#f9fbfe;padding:13px;min-height:80px;color:#283a53;transition:background .2s,border .2s}.exam-qual:hover{border-color:#9fbee9}.exam-qual.active{background:#eaf3ff;border-color:#75a7f2;box-shadow:0 0 0 2px #2866ee09}.exam-qual__icon{display:grid;place-items:center;flex:0 0 37px;height:37px;background:#e4edfa;border-radius:10px;color:#5979ad;font-size:12px;font-weight:870}.exam-qual.active .exam-qual__icon{background:#2866ee;color:#fff}.exam-qual b{display:block;font-size:14px}.exam-qual small{display:block;font-size:10px;color:#7b8aa1;margin-top:4px}.exam-qual__check{margin-left:auto;color:#2866ee;font-size:16px;opacity:0}.exam-qual.active .exam-qual__check{opacity:1}.exam-mode-row{padding:25px 0;border-bottom:1px solid #e9edf5;display:flex;align-items:center;justify-content:space-between;gap:15px}.exam-mode-row p{font-size:10.6px;color:#9aa5b5;margin:5px 0 0}.exam-mode-tabs{display:flex;padding:4px;background:#f0f3f9;border:1px solid #e4e9f2;border-radius:9px}.exam-mode{white-space:nowrap;border:0;background:transparent;border-radius:7px;font-size:11px;font-weight:790;padding:9px 13px;color:#748398}.exam-mode.active{background:#fff;color:#275fd0;box-shadow:0 2px 7px #19325714}.exam-quiz{padding:28px 34px 31px}.exam-progress-head{display:flex;justify-content:space-between;gap:16px;font-size:10px;font-weight:860;letter-spacing:.8px;color:#3976d5}.exam-progress-head>span:last-child{color:#8797ad}.exam-progress{height:6px;border-radius:20px;background:#e6ecf5;overflow:hidden;margin:12px 0 33px}.exam-progress span{width:12.5%;height:100%;background:#2866ee;display:block;transition:width .3s}.exam-question{font-size:26px;line-height:1.35;letter-spacing:-.83px;font-weight:850;max-width:610px;margin:0 0 6px}.exam-question-guide{color:#8290a4;font-size:11.5px;margin:0 0 21px}.exam-options{display:grid;gap:11px}.exam-option{min-height:61px;background:#fff;text-align:left;display:flex;align-items:center;gap:15px;padding:12px 16px;border:1px solid #e3e9f3;border-radius:10px;transition:background .17s,border .17s;line-height:1.5;color:#43536b;font-size:12.5px}.exam-option:hover:not(:disabled){background:#f5f9ff;border-color:#91b9f1}.exam-option>b{width:34px;height:34px;flex:0 0 34px;background:#f2f5f9;color:#667f9e;border-radius:8px;display:grid;place-items:center;font-size:11px}.exam-option>span{flex:1;min-width:0}.exam-option i{width:17px;height:17px;border-radius:50%;border:1.5px solid #aebbd0;flex:0 0 17px}.exam-option.selected{border-color:#5e95ed;background:#eef5ff}.exam-option.selected>b{color:#fff;background:#2866ee}.exam-option.selected i{border-color:#2866ee;box-shadow:inset 0 0 0 4px #eef5ff;background:#2866ee}.exam-option.correct{background:#ebf9f3;border-color:#5cc89d}.exam-option.correct>b{background:#239d76;color:#fff}.exam-option.correct i{border-color:#26a478;background:#26a478;box-shadow:inset 0 0 0 4px #ebf9f3}.exam-option.incorrect{background:#fff1f2;border-color:#ec93a0}.exam-option.incorrect>b{background:#d66e7d;color:#fff}.exam-option.incorrect i{border-color:#e2798b;background:#e2798b;box-shadow:inset 0 0 0 4px #fff1f2}.exam-option:disabled{opacity:1}.exam-feedback{padding:16px 18px;margin-top:15px;background:#e7f8f1;border:1px solid #bfead9;border-radius:9px;color:#22694d;font-size:11.6px;line-height:1.75}.exam-feedback[data-status="wrong"]{background:#fff0f1;border-color:#f4cdd1;color:#8b4651}.exam-feedback b{display:block;margin-bottom:2px}.exam-nav{margin-top:29px;padding-top:22px;border-top:1px solid #edf0f6;display:flex;align-items:center;justify-content:space-between;gap:12px}.exam-nav>span{font-size:11px;color:#96a4b7;font-weight:720}.exam-nav .button{min-height:44px;padding:11px 15px;font-size:11.2px}.exam-nav button:disabled{opacity:.46;cursor:not-allowed;transform:none}
.exam-results{padding:42px 38px}.exam-results__eyebrow{font-size:10px;letter-spacing:1.4px;font-weight:870;color:#2866ee}.exam-score{font-size:75px;font-weight:880;letter-spacing:-4px;line-height:1.1;margin:14px 0 5px;color:#255fdb}.exam-score span{font-size:32px;letter-spacing:-2px;color:#9baec9}.exam-results h2{font-size:30px;letter-spacing:-1px;margin:10px 0}.exam-results>p{color:#65738b;font-size:13px;line-height:1.75}.exam-review{display:grid;gap:10px;margin:27px 0}.review-item{padding:15px 16px;border:1px solid #e1e8f2;border-radius:10px}.review-item>div{display:flex;align-items:center;gap:9px;margin-bottom:7px}.review-item b{font-size:12px}.review-item p{margin:0;color:#687891;font-size:11.3px;line-height:1.65}.review-icon{font-size:12px;font-weight:850;color:#178c69}.review-item.review-wrong .review-icon{color:#c45b65}.exam-result-buttons{display:flex;gap:11px;flex-wrap:wrap}.exam-result-buttons .button{min-height:47px;font-size:11.3px}
.exam-sidebar{display:grid;gap:18px;position:sticky;top:111px}.sidebar-card{background:#11233d;border-radius:17px;padding:28px 26px;color:#fff}.sidebar-eyebrow{font-size:9.5px;letter-spacing:1.2px;color:#91bced;font-weight:830}.sidebar-stat{display:flex;gap:14px;align-items:center;margin:18px 0 20px}.sidebar-stat strong{font-size:55px;line-height:1;color:#fff;letter-spacing:-3px}.sidebar-stat span{font-size:11px;color:#a4bad2;line-height:1.55}.sidebar-divider{height:1px;background:#31415b}.sidebar-list{margin-top:20px;display:grid;gap:18px}.sidebar-list>div{display:flex;gap:12px}.sidebar-list span{font-size:11px;font-weight:860;color:#80b7f9}.sidebar-list p{color:#c1cfe0;font-size:11px;line-height:1.65;margin:0}.sidebar-muted{font-size:10.3px;color:#819bb6;line-height:1.8;margin:24px 0 0}.sidebar-help{background:#e8f1ff;border:1px solid #dce9fb;padding:26px;border-radius:17px}.sidebar-help>span{font-size:9.5px;color:#316bce;letter-spacing:1.3px;font-weight:850}.sidebar-help h3{font-size:20px;letter-spacing:-.6px;margin:14px 0 8px;line-height:1.35}.sidebar-help p{font-size:11px;color:#6a82a4;line-height:1.8}.sidebar-help a{color:#255fca;display:inline-flex;align-items:center;gap:8px;font-size:11px;font-weight:840}.sidebar-help svg{width:15px}
/* Library page */
.library-section{background:#f7f9fc;padding:43px 0 108px}.library-search{padding:26px;background:#fff;border:1px solid #e3eaf3;border-radius:15px}.library-search>label{display:block;font-weight:840;color:#213553;font-size:14px;margin-bottom:14px}.library-search__input{display:flex;align-items:center;gap:15px;border:1px solid #dce5f0;border-radius:10px;padding:0 17px;min-height:58px;color:#2866e0;background:#fcfdff}.library-search__input:focus-within{outline:2px solid #a6c6f7}.library-search__input input{border:0;outline:none;flex:1;background:transparent;font-size:14px;color:#132844;min-width:0}.library-search__input input::placeholder{color:#a4b0c0}.library-search__input button{background:#eef3fb;border:0;color:#657997;font-size:13px;border-radius:6px;padding:4px 8px}.library-toolbar{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:26px 0 18px}.library-filter{padding:11px 16px}.qualification-select{display:flex;align-items:center;gap:12px;color:#8190a5;font-size:10.5px;font-weight:770;white-space:nowrap}.qualification-select select{padding:10px 27px 10px 12px;border-radius:8px;border:1px solid #dce5f0;color:#2b466c;background:#fff;font-size:11px;font-weight:800;cursor:pointer}.library-info{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:21px}.library-info p{font-size:12px;font-weight:680;color:#455c78;margin:0}.library-info strong{font-size:16px;color:#205fd3}.library-info>span{color:#8997aa;font-size:10.5px}.articles-grid--library{gap:20px}.library-empty{background:#fff;border:1px dashed #b5c9e4;padding:55px 20px;text-align:center;border-radius:15px}.library-empty>span{font-size:42px;color:#3476e2}.library-empty h2{font-size:27px;letter-spacing:-1px;margin:8px 0}.library-empty p{color:#74839a;font-size:12px}.library-empty .button{margin-top:13px}.library-note{margin-top:26px;display:flex;align-items:center;justify-content:space-between;gap:22px;background:#fff;border:1px solid #e3eaf3;border-radius:12px;padding:18px 22px}.library-note>div{display:flex;align-items:center;gap:15px}.library-note>div>span{font-size:22px;color:#2866ee}.library-note p{color:#7b8aa0;font-size:11px;max-width:770px;line-height:1.7;margin:0}.library-note>a{white-space:nowrap;display:inline-flex;gap:8px;align-items:center;font-size:11px;font-weight:810;color:#2866d8}.library-note svg{width:16px}
.notfound{padding:100px 0 160px}.notfound h1{font-size:clamp(43px,6vw,75px);letter-spacing:-2.5px;line-height:1.14;margin:20px 0}.notfound p{font-size:14px;line-height:1.8;color:#72819a;max-width:450px}
/* Tablet and laptop */
@media(max-width:1190px){.container{width:min(100% - 64px,1250px)}.desktop-nav{gap:17px}.nav-item{font-size:11.7px}.header-grid{gap:16px}.hero h1{font-size:clamp(46px,5.1vw,63px);letter-spacing:-2.7px}.hero-layout{grid-template-columns:49% 51%}.hero-demo{transform:translateX(12px)}.floating-fact--top{right:-4px}.floating-fact--bottom{left:-5px}.quick-content b{font-size:10.8px}.quick-content small{font-size:9.2px}.quick-grid>a{gap:9px}.learning-grid{gap:65px}.faq-layout{gap:65px}.footer-main{gap:29px}.qual-diagram{opacity:.65;right:-19px}}
@media(max-width:1030px){.desktop-nav{display:none}.header-grid{min-height:75px}.header-tools{margin-left:auto}.menu-toggle{height:43px;width:45px;display:flex;flex-direction:column;justify-content:center;gap:5px;align-items:center;border-radius:10px;border:1px solid #dce5f1;background:#fff}.menu-toggle span{display:block;width:19px;height:2px;border-radius:2px;background:#152941;transition:transform .2s,opacity .2s}.menu-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}.menu-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}.menu-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}.mobile-menu:not([hidden]){display:flex;flex-direction:column;gap:2px;padding:10px 32px 22px;border-top:1px solid #eef1f6;background:#fff;box-shadow:0 20px 30px #17305412}.mobile-menu a{display:flex;align-items:center;justify-content:space-between;padding:13px 6px;font-size:13px;font-weight:750;color:#30435d}.mobile-menu a.is-current{color:#2866ee}.mobile-menu a.mobile-cta{color:#fff;background:#2866ee;border-radius:9px;padding:13px 16px;margin-top:8px}.mobile-menu svg{width:16px}}
@media(max-width:900px){.container{width:min(100% - 48px,1250px)}.hero-layout{grid-template-columns:1fr;padding-top:63px;padding-bottom:32px}.hero-text{max-width:720px;padding-bottom:0}.hero h1{font-size:clamp(49px,7vw,68px)}.hero-description{max-width:590px}.hero-trust{margin-top:30px}.hero-demo{margin-top:32px;min-height:490px;transform:none}.practice-window{width:min(100%,560px);transform:rotate(-1deg)}.floating-fact--top{right:max(0px,calc((100% - 600px)/2))}.floating-fact--bottom{left:max(0px,calc((100% - 600px)/2))}.hero-bottom{margin-top:5px}.quick-grid{grid-template-columns:repeat(2,1fr)}.quick-grid>a{min-height:91px}.quick-grid>a:nth-child(2)::after{display:none}.quick-grid>a:not(:last-child)::after{right:20px}.qualification-grid{gap:14px}.qual-card__copy{width:72%}.qual-card__copy h3{font-size:23px}.qual-card__body{padding:10px 22px 20px;min-height:310px}.qual-card__top{padding:24px 22px 0}.qual-card__footer{margin:0 22px}.qual-diagram{opacity:.35}.learning-grid{grid-template-columns:1fr;gap:37px}.learning-intro h2{max-width:670px}.learning-intro p{max-width:620px}.learning-detail{margin-top:22px}.articles-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.faq-layout{grid-template-columns:1fr;gap:32px}.footer-main{grid-template-columns:1.6fr 1fr 1fr;gap:26px}.footer-column--last{grid-column:1/-1;border-top:1px solid #253853;padding-top:24px}.subhero-grid{gap:25px}.exam-layout{grid-template-columns:minmax(0,1fr)}.exam-sidebar{position:static;display:grid;grid-template-columns:1fr 1fr}.sidebar-card,.sidebar-help{height:100%}}
@media(max-width:660px){.container{width:calc(100% - 38px)}.preview-secondary{display:none}.preview-banner{height:30px}.preview-banner__inner>span:first-child{font-size:8.5px;letter-spacing:.8px}.header-grid{min-height:70px}.brand-symbol,.brand-symbol svg{width:38px;height:38px}.brand-type{font-size:17px}.brand-type small{font-size:7.5px;letter-spacing:.75px}.header-button{display:none}.header-tools{gap:8px}.icon-button{width:39px;height:39px}.menu-toggle{height:39px;width:41px}.mobile-menu:not([hidden]){padding:10px 19px 20px}.hero-layout{padding-top:49px;padding-bottom:25px}.hero h1{font-size:clamp(38px,8.7vw,55px);letter-spacing:-2.3px;white-space:normal;line-height:1.15;margin:22px 0 17px}.hero-description{font-size:14px;line-height:1.82}.eyebrow--blue{font-size:9px;letter-spacing:.7px;padding:9px 11px}.hero-actions{margin-top:25px;gap:10px}.hero-actions .button{font-size:11.2px;gap:13px;min-height:47px;padding:12px 14px}.hero-trust{margin-top:26px}.hero-demo{min-height:415px;margin-top:20px}.practice-window{width:calc(100% - 5px);transform:none;border-radius:13px}.practice-window__main{padding:21px 19px 20px}.practice-window__header{min-height:41px;padding:0 13px;font-size:9px}.window-badge{font-size:8px}.window-eyebrow{font-size:8px}.window-progress{margin:10px 0 16px}.practice-window h2{font-size:18px;margin:12px 0 16px}.home-answer{font-size:10px;padding:8px 10px;min-height:43px}.home-answer>b{flex:0 0 25px;height:25px}.home-demo-feedback{margin-top:10px}.floating-fact{padding:7px 8px;gap:6px;border-radius:9px}.floating-fact--top{right:-4px;top:-8px;transform:rotate(5deg)}.floating-fact--bottom{left:-4px;bottom:-5px;transform:rotate(2deg)}.floating-fact__icon,.floating-fact__check{width:27px;height:27px}.floating-fact b{font-size:8px}.floating-fact small{font-size:7.5px}.hero-bottom{font-size:8px;letter-spacing:.7px;padding-bottom:16px}.hero-bottom>span:first-child{max-width:160px}.hero-bottom b{padding-left:4px}.quick-grid>a{min-height:80px}.quick-icon{width:28px;height:28px;flex:0 0 28px}.quick-number{font-size:8px}.quick-content b{font-size:10.2px}.quick-content small{font-size:8.9px;white-space:normal}.quick-grid>a:not(:last-child)::after{right:6px}.section{padding:75px 0}.section-head{display:block;margin-bottom:26px}.section-head h2,.faq-intro h2{font-size:clamp(35px,8vw,43px);letter-spacing:-1.75px;margin-top:14px}.section-head>p{margin:17px 0 0;max-width:500px;font-size:12.5px}.qualification-grid{grid-template-columns:1fr}.qualification-card{min-height:370px}.qual-card__body{min-height:260px}.qual-card__copy{width:70%}.qual-diagram{opacity:.68;right:2px}.qual-card__copy h3{font-size:26px}.learning-section{padding:76px 0}.learning-intro h2{font-size:41px}.learning-grid{gap:25px}.learning-step{grid-template-columns:35px 1fr 16px;padding:19px 16px}.learning-step h3{font-size:15px}.learning-step p{font-size:10.5px}.materials-section{padding:78px 0}.materials-tools{gap:14px}.filter-button{padding:10px 11px;font-size:10px}.articles-grid{gap:12px}.article-art{height:145px}.article-body{padding:17px}.article-body h3{font-size:16px;min-height:41px}.article-body p{font-size:10.5px}.visual-python{width:88%;font-size:9px;padding:22px 10px 14px}.visual-variables{width:190px;font-size:10px}.vis-ip-main{font-size:13px;gap:5px}.visual-ip{width:178px}.visual-osi span{width:24px;height:42px}.materials-bottom{flex-wrap:wrap;padding:15px}.materials-bottom a{width:100%;justify-content:flex-end}.cta-section{padding:0 0 75px}.cta-card{min-height:355px}.cta-content{padding:43px 26px}.cta-content h2{font-size:35px}.cta-content p{font-size:11.5px;max-width:340px}.cta-card__decor{opacity:.12;right:-115px}.faq-section{padding:70px 0 85px}.faq-intro p{font-size:12px}.faq-list summary{font-size:12.4px;padding:19px 0}.faq-list details p{font-size:11.5px}.footer-main{grid-template-columns:1fr 1fr;gap:35px;padding:52px 0 38px}.footer-brand{grid-column:1/-1}.footer-column--last{grid-column:1/-1}.footer-bottom{flex-wrap:wrap;font-size:9px;padding:20px 0}.footer-bottom>span:nth-child(2){width:100%;order:3}.subhero-grid{grid-template-columns:1fr;gap:10px;padding:62px 0 50px}.subhero h1{font-size:clamp(47px,10.5vw,63px);letter-spacing:-2px}.subhero-side{padding:8px 0 0}.subhero-side p{font-size:12.5px;max-width:500px;margin-bottom:16px}.exam-section{padding:22px 0 65px}.exam-setup{padding:23px 18px 0}.exam-qual-tabs{gap:8px}.exam-qual{gap:8px;min-height:75px;padding:9px}.exam-qual__icon{flex:0 0 29px;height:29px;font-size:10px}.exam-qual b{font-size:12px}.exam-qual small{font-size:9px}.exam-qual__check{display:none}.exam-mode-row{display:block;padding:22px 0}.exam-mode-tabs{display:inline-flex;margin-top:12px}.exam-quiz{padding:24px 18px}.exam-question{font-size:23px}.exam-option{font-size:11.7px;padding:10px;gap:9px;min-height:55px}.exam-option>b{width:29px;height:29px;flex:0 0 29px}.exam-nav{flex-wrap:wrap}.exam-nav .button{font-size:10.2px}.exam-nav>span{order:-1;width:100%;text-align:center}.exam-sidebar{grid-template-columns:1fr}.exam-results{padding:30px 20px}.exam-score{font-size:65px}.library-section{padding:23px 0 75px}.library-search{padding:18px}.library-search__input{min-height:50px}.library-search__input input{font-size:12px}.library-toolbar{align-items:flex-start;flex-direction:column;gap:15px;padding:21px 0 15px}.library-info{display:block}.library-info>span{display:block;margin-top:5px;font-size:9.3px}.library-note{align-items:flex-start;flex-direction:column}.search-overlay{padding:9vh 12px}.search-dialog form{padding:13px 12px}.search-dialog input{font-size:12px}.search-dialog form button{font-size:10px}.notfound{padding:80px 0 120px}}
@media(max-width:390px){.container{width:calc(100% - 28px)}.brand-type{font-size:15px}.brand-type small{font-size:7px}.brand-symbol,.brand-symbol svg{width:35px;height:35px}.header-tools{gap:5px}.hero h1{font-size:37px;letter-spacing:-2px}.hero-actions{display:grid;grid-template-columns:1fr 1fr;gap:6px}.hero-actions .button{font-size:10px;white-space:normal;text-align:center;gap:5px}.hero-actions .button svg{display:none}.hero-demo{min-height:390px}.practice-window__main{padding:17px 13px}.practice-window h2{font-size:17px}.window-eyebrow{font-size:7.3px}.floating-fact--bottom{bottom:-7px}.quick-number{display:none}.quick-grid>a{padding-right:4px}.quick-icon{display:none}.quick-grid{gap:0}.quick-grid>a{padding-left:6px}.quick-grid>a:not(:last-child)::after{right:3px}.qual-card__copy{width:80%}.qual-diagram{opacity:.25}.qual-card__footer{gap:5px}.qual-card__footer a{font-size:10px}.qual-details{font-size:9px!important}.articles-grid{grid-template-columns:1fr}.article-art{height:185px}.article-body h3{min-height:0}.article-body p{min-height:0}.filter-button{font-size:9.5px;padding:10px 8px;gap:5px}.visual-python{font-size:12px}.exam-qual small{display:none}.exam-qual{min-height:55px}.exam-quiz{padding:23px 14px}.exam-nav .button{padding:10px 8px}.exam-nav svg{display:none}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}.practice-window{transform:none!important}}
@media(max-width:390px){
  .preview-banner__inner>span:first-child{font-size:7.9px;letter-spacing:.5px;gap:6px}
}
/* Micro-interactions: intentionally subtle and automatically disabled for reduced-motion users. */
@media(prefers-reduced-motion:no-preference){
  @keyframes hover-note-top {0%,100%{transform:rotate(7deg) translateY(0)}50%{transform:rotate(5deg) translateY(-7px)}}
  @keyframes hover-note-bottom {0%,100%{transform:rotate(4deg) translateY(0)}50%{transform:rotate(2deg) translateY(7px)}}
  @keyframes terminal-caret {0%,49%{opacity:1}50%,100%{opacity:.2}}
  .floating-fact--top{animation:hover-note-top 7s ease-in-out infinite}
  .floating-fact--bottom{animation:hover-note-bottom 9s ease-in-out infinite}
  .term-cursor{animation:terminal-caret 1.25s step-end infinite}
}


/* V03: editorial course and knowledge templates; no external fonts required */
.v3-subhero h1{font-size:clamp(2.3rem,4.1vw,4.5rem);max-width:900px;line-height:1.08;letter-spacing:-.04em}
.v3-subhero .subhero-side{align-self:center}
.v3-subhero p{max-width:36rem}
.v3-course-section{background:#f7f9fd}
.v3-course-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin-top:30px}
.v3-course{min-width:0;background:white;border:1px solid #e5eaf4;border-radius:24px;box-shadow:0 8px 26px rgba(18,39,69,.035);transition:transform .2s,box-shadow .2s}
.v3-course:hover{transform:translateY(-4px);box-shadow:0 16px 34px rgba(18,39,69,.075)}
.v3-course-link{display:flex;flex-direction:column;min-height:278px;padding:26px;text-decoration:none;color:#10223e}
.v3-course-top,.v3-course-bottom{display:flex;justify-content:space-between;align-items:center;gap:10px}
.v3-course-symbol{display:inline-flex;align-items:center;justify-content:center;width:61px;height:61px;border-radius:17px;background:#e9f1ff;color:#175fdb;font-weight:900;font-size:20px;letter-spacing:-.03em}
.v3-course:nth-child(2n) .v3-course-symbol{background:#f1ecff;color:#7352bf}
.v3-course:nth-child(3n) .v3-course-symbol{background:#e2f9f3;color:#127b60}
.v3-pill{padding:8px 12px;border-radius:99px;background:#f3f6fa;color:#506481;font-size:12px;font-weight:800}
.v3-course h3{font-size:24px;letter-spacing:-.045em;line-height:1.19;margin:23px 0 10px}
.v3-course p{font-size:15px;line-height:1.65;color:#61708a;margin:0 0 24px;flex:1}
.v3-course-bottom{border-top:1px solid #e9eef5;padding-top:17px;font-size:12px;color:#8090a7}
.v3-course-bottom b{color:#1c64e9;white-space:nowrap}
.v3-info{padding:20px 24px;border-radius:14px;background:#eef4ff;color:#30496d;border-left:4px solid #2e72f4;line-height:1.65;margin:0 0 26px}
.v3-split{display:grid;grid-template-columns:minmax(0,1.75fr) minmax(240px,.75fr);gap:clamp(25px,6vw,92px);align-items:start}
.v3-split h2{font-size:clamp(2rem,3.3vw,3.5rem);letter-spacing:-.045em;color:#0f2343;line-height:1.12;margin:16px 0 20px}
.v3-intro{color:#546680;line-height:1.75;font-size:17px;margin-bottom:20px}
.v3-lesson-list{margin:20px 0 30px;padding:0;list-style:none;border-top:1px solid #dfe7f1}
.v3-lesson-list li{margin:0}
.v3-lesson-list li a{display:flex;align-items:center;gap:17px;border-bottom:1px solid #dfe7f1;padding:22px 4px;color:#0b2140;text-decoration:none}
.v3-lesson-list li a:hover{background:#f5f8ff}
.v3-lesson-list li a span:first-child{font-size:14px;color:#1a64eb;font-weight:900;min-width:38px}
.v3-lesson-list li a b{font-size:16px;flex:1;line-height:1.4}
.v3-lesson-list li a span:last-child{font-size:13px;color:#557395}
.v3-side{background:#0d203c;color:#fff;border-radius:22px;padding:32px;position:sticky;top:108px}
.v3-side h3{font-size:26px;letter-spacing:-.04em;margin:24px 0 8px;color:white}
.v3-side p{color:#bcc9df;line-height:1.65;margin-bottom:28px}
.v3-side-symbol{display:inline-grid;place-items:center;padding:12px;min-width:60px;height:60px;background:#2563eb;border-radius:16px;font-weight:900;font-size:21px}
.v3-side a:not(.button){color:#bfd8ff}
.v3-listing{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin:24px 0}
.v3-feature{display:flex;gap:16px;align-items:center;padding:22px;border:1px solid #e4eaf3;border-radius:16px;background:#fff}
.v3-feature b{background:#eaf2ff;color:#175bd5;border-radius:12px;width:45px;height:45px;display:grid;place-items:center;flex-shrink:0}
.v3-feature p{margin:0;color:#253956;font-weight:750;line-height:1.35}
.v3-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}
.v3-post-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.v3-post{border:1px solid #e5eaf4;background:#fff;border-radius:20px;padding:24px;min-height:220px;display:flex;flex-direction:column;box-shadow:0 6px 19px rgba(17,38,65,.025)}
.v3-post h3{font-size:22px;letter-spacing:-.035em;line-height:1.25;margin:14px 0}
.v3-post h3 a{color:#142743;text-decoration:none}
.v3-post h3 a:hover{color:#2264ea}
.v3-post p{color:#677892;font-size:14px;line-height:1.6;flex:1}
.v3-post-meta{font-size:11px;font-weight:900;letter-spacing:.08em;color:#3671e0;text-transform:uppercase}
.v3-text-link{font-size:13px;font-weight:850;color:#2765df;text-decoration:none}
.v3-reading{max-width:850px}
.v3-reading h2,.v3-article h2{font-size:clamp(1.7rem,2.4vw,2.4rem);letter-spacing:-.035em;color:#10223e;margin:35px 0 16px}
.v3-reading p,.v3-article p,.v3-article li{font-size:17px;line-height:1.84;color:#3e506c}
.v3-reading a{color:#1e63e8}
.v3-faq details{border-bottom:1px solid #e3e9f2;padding:22px 0}
.v3-faq summary{font-weight:800;color:#102441;cursor:pointer;font-size:19px}
.v3-faq p{margin:15px 0 4px}
.v3-article{max-width:870px;margin-inline:auto;overflow-wrap:anywhere}
.v3-article img{max-width:100%;height:auto;border-radius:12px}
.v3-article pre{overflow:auto;background:#0d213c;color:#e9f3ff;padding:20px;border-radius:16px;line-height:1.6}
.v3-article table{display:block;overflow-x:auto;width:100%}
.v3-article code{overflow-wrap:anywhere}
.v3-article ul,.v3-article ol{padding-left:24px}
.v3-article a{color:#1762dd}
.v3-breadcrumbs{font-size:13px;color:#65758e;margin-bottom:20px}
.v3-breadcrumbs a{color:#2666d9;text-decoration:none}
.v3-page-intro{max-width:810px;font-size:18px;line-height:1.7;color:#4d5e79}
.v3-tag{display:inline-block;background:#edf3fe;color:#2563eb;border-radius:99px;padding:8px 13px;font-size:12px;font-weight:800;margin:0 7px 9px 0;text-decoration:none}
.v3-meta{color:#657895;font-size:14px;margin-bottom:30px}
.v3-pagination{margin:30px auto;display:flex;gap:8px;flex-wrap:wrap;justify-content:center}
.v3-pagination .page-numbers{padding:12px 16px;border:1px solid #d9e5f2;border-radius:10px;color:#1e62e2;text-decoration:none}
.v3-pagination .current{color:#fff;background:#1e62e2}
.v3-search{display:flex;gap:10px;flex-wrap:wrap;margin:20px 0 32px}
.v3-search input,.v3-search select{border:1px solid #cbd8ea;border-radius:12px;padding:14px 16px;font:inherit;background:white;min-width:0}
.v3-search input{flex:1;min-width:190px}
.v3-search button{cursor:pointer}
.v3-narrow{max-width:1000px;margin:0 auto}
.v3-foot-note{font-size:12px;line-height:1.6;color:#8292a8}
@media(max-width:1050px){.v3-course-grid,.v3-post-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:760px){.v3-course-grid,.v3-post-grid,.v3-split,.v3-listing{grid-template-columns:1fr}.v3-course-link{min-height:auto}.v3-side{position:static}.v3-lesson-list li a{flex-wrap:wrap}.v3-lesson-list li a span:last-child{margin-left:53px}.v3-course-section .section-head{display:block}.v3-course-section .section-head a{display:inline-flex;margin-top:18px}}
@media(prefers-reduced-motion:reduce){.v3-course{transition:none}.v3-course:hover{transform:none}}

/* Seven-item nav: switch to mobile layout slightly earlier to prevent collisions. */
@media(max-width:1330px){.desktop-nav{display:none}.header-tools{margin-left:auto}.menu-toggle{height:43px;width:45px;display:flex;flex-direction:column;justify-content:center;gap:5px;align-items:center;border-radius:10px;border:1px solid #dce5f1;background:#fff}.menu-toggle span{display:block;width:19px;height:2px;border-radius:2px;background:#152941}.menu-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}.menu-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}.menu-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}.mobile-menu:not([hidden]){display:flex;flex-direction:column;gap:2px;padding:10px 32px 22px;border-top:1px solid #eef1f6;background:#fff;box-shadow:0 20px 30px #17305412}.mobile-menu a{display:flex;align-items:center;justify-content:space-between;padding:13px 6px;font-size:13px;font-weight:750;color:#30435d}.mobile-menu a.is-current{color:#2866ee}}