:root {
  --ink: #061b44;
  --ink-2: #0b2b59;
  --blue: #0868ef;
  --blue-2: #0758c7;
  --cyan: #13bde3;
  --amber: #f2a900;
  --green: #137a43;
  --red: #c9363e;
  --paper: #fff;
  --mist: #f5f8fc;
  --line: #d6e0ed;
  --muted: #586982;
  --terminal: #07111f;
  --shadow: 0 16px 40px rgba(6, 27, 68, .10);
  --radius: 10px;
  --max: 1180px;
  --sidebar: 260px;
  color-scheme: light;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); line-height: 1.55; }
body, button, input, textarea, select { font: inherit; }
img, svg { max-width: 100%; }
a { color: var(--blue); text-decoration-thickness: .08em; text-underline-offset: .18em; }
button, a { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }
:focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; box-shadow: 0 0 0 2px #fff; }
.skip-link { position: fixed; z-index: 9999; left: 1rem; top: -5rem; background: var(--ink); color: #fff; padding: .7rem 1rem; }
.skip-link:focus { top: 1rem; }
.container { width: min(calc(100% - 2rem), var(--max)); margin-inline: auto; }
.muted { color: var(--muted); }
.small { font-size: .875rem; }
.mono { font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; }
.text-center { text-align: center; }
.metric-value { display: block; font-size: 2rem; font-weight: 850; }
.big-number { font-size: 2.4rem; font-weight: 850; }
.section-page-title { margin: 0; font-size: clamp(2.6rem,6vw,5rem); line-height: 1; letter-spacing: -.055em; }
.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; }
.visually-hidden { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.narrow { width: min(100%, 820px); margin-inline: auto; }
.eyebrow { color: var(--blue); font-size: .78rem; font-weight: 850; letter-spacing: .08em; text-transform: uppercase; }
.stack { display: grid; gap: 1rem; }
.row { display: flex; align-items: center; gap: .75rem; flex-wrap: wrap; }
.spread { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.rule { height: 1px; background: var(--line); border: 0; margin: 1.5rem 0; }

.site-header { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.96); border-bottom: 1px solid var(--line); backdrop-filter: blur(12px); }
.nav { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
.brand { color: var(--ink); text-decoration: none; display: inline-flex; flex-direction: column; line-height: 1; letter-spacing: -.035em; }
.brand strong { font-size: 1.75rem; font-weight: 850; }
.brand small { margin-top: .38rem; font-size: .72rem; letter-spacing: .04em; text-transform: uppercase; }
.nav-links { display: flex; align-items: center; gap: 1.35rem; }
.nav-links a { color: var(--ink); text-decoration: none; font-weight: 650; font-size: .93rem; }
.nav-toggle { display: none; border: 1px solid var(--line); background: #fff; border-radius: 8px; padding: .55rem .7rem; color: var(--ink); }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: .5rem; min-height: 46px; border: 1px solid transparent; border-radius: 7px; padding: .68rem 1.08rem; font-weight: 750; text-decoration: none; transition: transform .18s ease, background .18s ease, box-shadow .18s ease; }
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--blue); color: #fff; box-shadow: 0 8px 18px rgba(8,104,239,.22); }
.btn-primary:hover { background: var(--blue-2); }
.btn-secondary { background: #fff; border-color: var(--blue); color: var(--blue); }
.btn-quiet { background: var(--mist); border-color: var(--line); color: var(--ink); }
.btn-danger { background: #fff; border-color: #e6a6aa; color: var(--red); }
.btn-sm { min-height: 36px; padding: .43rem .75rem; font-size: .88rem; }
.btn[disabled], button[disabled] { opacity: .55; cursor: not-allowed; transform: none; }

.hero { overflow: hidden; padding: clamp(3.25rem, 7vw, 6.4rem) 0 4.5rem; background: radial-gradient(circle at 18% 82%, rgba(19,189,227,.09), transparent 26%), #fff; }
.hero-grid { display: grid; grid-template-columns: minmax(0,.86fr) minmax(520px,1.14fr); align-items: center; gap: clamp(2rem, 5vw, 5rem); }
.hero h1 { margin: 0 0 1.3rem; max-width: 620px; font-size: 5rem; font-size: clamp(3rem, 6.2vw, 5.5rem); letter-spacing: -.065em; line-height: .98; }
.hero .lede { max-width: 610px; font-size: 1.35rem; font-size: clamp(1.15rem, 2vw, 1.45rem); color: #263b5b; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .85rem; margin-top: 2rem; }
.hero-proof { display: grid; grid-template-columns: repeat(4,1fr); gap: 0; margin-top: 3.2rem; border-top: 1px solid var(--line); }
.proof-item { padding: 1.2rem .9rem 0 0; }
.proof-item strong { display: block; font-size: .98rem; }
.proof-item span { color: var(--muted); font-size: .82rem; }

.topology-window { background: #fff; border: 1px solid #b9c9dc; border-radius: 12px; overflow: hidden; box-shadow: var(--shadow); }
.window-bar { min-height: 43px; background: var(--ink); color: #fff; display: flex; align-items: center; justify-content: space-between; padding: 0 .85rem; font-size: .8rem; }
.window-tabs { display: flex; gap: 1rem; }
.window-tabs span:first-child { color: #56dcff; border-bottom: 2px solid #56dcff; padding-block: .75rem; }
.topology-canvas { min-height: 365px; padding: 1rem; background-color: #fff; background-image: radial-gradient(#dce5ef .75px, transparent .75px); background-size: 15px 15px; }
.topology-map { position: relative; min-height: 325px; }
.device { position: absolute; z-index: 3; min-width: 72px; padding: .45rem .55rem; text-align: center; background: #fff; border: 2px solid #19a9cb; border-radius: 8px; font-size: .7rem; box-shadow: 0 4px 12px rgba(6,27,68,.08); }
.device::before { content: ""; display: block; width: 28px; height: 14px; margin: 0 auto .25rem; background: var(--ink-2); border-radius: 4px; box-shadow: inset 0 -3px 0 var(--cyan); }
.device.r1 { left: 44%; top: 3%; }
.device.sw1 { left: 18%; top: 42%; }
.device.sw2 { right: 18%; top: 42%; }
.device.pc1 { left: 4%; top: 76%; }
.device.pc2 { left: 30%; top: 76%; }
.device.pc3 { right: 30%; top: 76%; }
.device.pc4 { right: 4%; top: 76%; }
.net-line { position: absolute; z-index: 1; height: 2px; background: #36a45b; transform-origin: left center; }
.net-line.l1 { width: 31%; left: 47%; top: 19%; transform: rotate(145deg); }
.net-line.l2 { width: 31%; left: 50%; top: 19%; transform: rotate(35deg); }
.net-line.l3 { width: 48%; left: 27%; top: 51%; background: var(--amber); }
.net-line.l4 { width: 29%; left: 23%; top: 56%; transform: rotate(112deg); }
.net-line.l5 { width: 29%; left: 24%; top: 56%; transform: rotate(68deg); }
.net-line.l6 { width: 29%; right: 22%; top: 56%; transform: rotate(68deg); transform-origin: right center; }
.net-line.l7 { width: 29%; right: 23%; top: 56%; transform: rotate(112deg); transform-origin: right center; }
.terminal-mini { background: var(--terminal); color: #d6e8f4; padding: 1rem; min-height: 145px; font: .75rem/1.55 "SFMono-Regular", Consolas, monospace; }
.terminal-mini .ok { color: #63de86; }

.section { padding: clamp(4rem, 8vw, 7.5rem) 0; }
.section-alt { background: var(--mist); border-block: 1px solid var(--line); }
.section-dark { color: #fff; background: var(--ink); }
.section-heading { max-width: 760px; margin-bottom: 2.5rem; }
.section-heading.center { margin-inline: auto; text-align: center; }
.section h2 { margin: 0 0 .8rem; font-size: 3rem; font-size: clamp(2rem, 4vw, 3.5rem); line-height: 1.08; letter-spacing: -.045em; }
.section-lede { margin: 0; color: var(--muted); font-size: 1.13rem; }
.section-dark .section-lede { color: #c0cee0; }
.method-grid { display: grid; grid-template-columns: repeat(4,1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.method { padding: 2rem clamp(1rem,3vw,2.3rem); border-right: 1px solid var(--line); }
.method:last-child { border: 0; }
.method .number { display: block; font-size: 2.4rem; font-weight: 850; color: var(--blue); letter-spacing: -.06em; }
.method h3 { margin: .6rem 0; font-size: 1.18rem; }
.method p { margin: 0; color: var(--muted); font-size: .93rem; }
.method-grid-dark { border-color: rgba(255,255,255,.22); }
.method-grid-dark .method { border-color: rgba(255,255,255,.22); }
.method-grid-dark .method p { color: #c0cee0; }
.seo-highlights { grid-template-columns: repeat(3,1fr); margin: 2rem 0; }
.plan-comparison .number { font-size: clamp(1.65rem,3vw,2.4rem); }
.domains { display: grid; gap: .7rem; }
.domain-row { display: grid; grid-template-columns: 52px 1fr 56px; align-items: center; gap: 1rem; padding: 1.15rem 0; border-bottom: 1px solid var(--line); }
.domain-number { font-weight: 850; color: var(--blue); }
.domain-row strong { display: block; }
.domain-row small { color: var(--muted); }
.domain-weight { text-align: right; font-size: 1.2rem; font-weight: 800; }
.curriculum { columns: 2; column-gap: 3.5rem; counter-reset: module; }
.curriculum li { break-inside: avoid; list-style: none; display: grid; grid-template-columns: 38px 1fr; gap: .75rem; padding: .8rem 0; border-bottom: 1px solid var(--line); counter-increment: module; }
.curriculum li::before { content: counter(module, decimal-leading-zero); color: var(--blue); font-weight: 850; }
.price-panel { display: grid; grid-template-columns: .72fr 1fr .8fr; align-items: center; gap: 2rem; border: 1px solid #9fbae0; padding: clamp(1.5rem,4vw,3rem); box-shadow: var(--shadow); }
.price { font-size: 7rem; font-size: clamp(4rem,9vw,7.5rem); line-height: .8; letter-spacing: -.08em; font-weight: 900; }
.price-label { color: var(--blue); font-size: 1.35rem; font-weight: 850; }
.check-list { list-style: none; padding: 0; margin: 0; display: grid; gap: .72rem; }
.check-list li::before { content: "✓"; display: inline-grid; place-items: center; width: 1.35rem; height: 1.35rem; margin-right: .55rem; color: var(--blue); border: 1px solid var(--blue); border-radius: 50%; font-size: .8rem; }
.legal-note { padding: 1rem; border-left: 3px solid var(--amber); background: #fff8e8; color: #49380d; font-size: .9rem; }
.legal-note-spaced { margin-top: 1.2rem; }
.faq { border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); padding: 1.1rem 0; }
.faq summary { cursor: pointer; font-size: 1.03rem; font-weight: 750; }
.faq p { max-width: 780px; color: var(--muted); }
.site-footer { background: #041534; color: #d9e5f4; padding: 3.3rem 0 2rem; }
.footer-brand { color: #fff; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: 3rem; }
.site-footer a { color: #d9e5f4; }
.footer-links { display: grid; gap: .55rem; }
.footer-bottom { margin-top: 2.5rem; padding-top: 1.5rem; border-top: 1px solid rgba(255,255,255,.18); font-size: .82rem; color: #abbad0; }

.form-shell { min-height: 75vh; display: grid; place-items: center; padding: 3rem 1rem; background: var(--mist); }
.form-card { width: min(100%, 480px); padding: clamp(1.5rem,5vw,2.5rem); background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow); }
.form-card h1 { font-size: 2rem; margin: 0 0 .5rem; letter-spacing: -.04em; }
.field { display: grid; gap: .35rem; margin: 1rem 0; }
.field label { font-weight: 700; font-size: .9rem; }
.field input, .field textarea, .field select { width: 100%; min-height: 45px; border: 1px solid #aebdd0; border-radius: 6px; padding: .65rem .75rem; background: #fff; color: var(--ink); }
.field textarea { min-height: 120px; resize: vertical; }
.field-help { font-size: .78rem; color: var(--muted); }
.form-error { color: #8f1e27; background: #fff0f1; border: 1px solid #efb8bd; padding: .8rem; }
.form-success { color: #0f6a3a; background: #effaf4; border: 1px solid #a8dfc2; padding: .8rem; }
.checkout-price { font-size: 1.5rem; color: var(--blue); }

.app-body { background: var(--mist); }
.app-layout { min-height: 100vh; display: grid; grid-template-columns: var(--sidebar) 1fr; }
.sidebar { position: sticky; top: 0; height: 100vh; overflow-y: auto; background: linear-gradient(180deg,#07245a,#031a42); color: #fff; padding: 1.4rem 1rem; }
.sidebar .brand { color: #fff; padding: 0 .65rem 1.5rem; }
.sidebar nav { display: grid; gap: .2rem; }
.sidebar nav a { display: flex; align-items: center; gap: .75rem; color: #e9f1fc; text-decoration: none; padding: .67rem .75rem; border-radius: 6px; font-weight: 650; font-size: .92rem; }
.sidebar nav a:hover, .sidebar nav a.active { background: var(--blue); color: #fff; }
.nav-icon { width: 1.15rem; text-align: center; opacity: .9; }
.sidebar-foot { margin-top: 1.6rem; padding: 1.2rem .7rem 0; border-top: 1px solid rgba(255,255,255,.28); font-size: .75rem; color: #afbed5; }
.app-main { min-width: 0; padding: 1.5rem clamp(1rem,3vw,2.2rem) 3rem; }
.app-top { min-height: 58px; display: flex; justify-content: space-between; align-items: flex-start; gap: 1rem; margin-bottom: 1.3rem; }
.app-top h1 { margin: 0; font-size: clamp(1.7rem,3vw,2.4rem); letter-spacing: -.04em; }
.app-actions { display: flex; align-items: center; gap: .7rem; }
.avatar { display: grid; place-items: center; width: 38px; height: 38px; border: 0; border-radius: 50%; background: var(--ink); color: #fff; font-weight: 800; }
.mobile-sidebar { display: none; }
.dashboard-grid { display: grid; grid-template-columns: 1.05fr 1.25fr .75fr; gap: .85rem; }
.panel { background: #fff; border: 1px solid var(--line); border-radius: 7px; padding: 1.05rem; }
.panel h2, .panel h3 { margin: 0 0 .85rem; font-size: .85rem; letter-spacing: .025em; text-transform: uppercase; }
.panel-wide { grid-column: span 2; }
.panel-full { grid-column: 1 / -1; }
.progress-row { display: grid; grid-template-columns: 1fr 46px; gap: .6rem; align-items: center; margin: .72rem 0; font-size: .83rem; }
.domain-progress { display: block; width: 100%; height: 7px; margin-top: .35rem; border: 0; border-radius: 9px; overflow: hidden; background: #e9eef5; }
.domain-progress::-webkit-progress-bar { background: #e9eef5; }
.domain-progress::-webkit-progress-value { background: var(--blue); }
.domain-progress::-moz-progress-bar { background: var(--blue); }
.progress-track { height: 7px; margin-top: .35rem; background: #e9eef5; border-radius: 9px; overflow: hidden; }
.progress-bar { height: 100%; width: 0; background: var(--blue); }
.progress-5 { width: 25%; }
.week-heading { margin-top: 1rem !important; }
.task-row { align-items: flex-start; }
.review-topic { flex: 1; }
.timeline { display: grid; grid-template-columns: repeat(8,1fr); gap: .25rem; border-bottom: 1px solid var(--line); padding-bottom: .8rem; }
.timeline span { display: grid; place-items: center; color: var(--ink); border-radius: 5px; padding: .45rem .2rem; font-size: .72rem; }
.timeline span.active { background: var(--blue); color: #fff; }
.task-list, .result-list, .review-list { list-style: none; padding: 0; margin: 0; display: grid; gap: .55rem; }
.task-list li, .result-list li, .review-list li { display: flex; justify-content: space-between; gap: .7rem; padding-block: .25rem; font-size: .82rem; }
.dot { width: .78rem; height: .78rem; flex: 0 0 auto; margin-top: .22rem; border: 2px solid var(--blue); border-radius: 50%; }
.dot.done { background: var(--green); border-color: var(--green); }
.result-good { color: var(--green); font-weight: 800; }
.result-low { color: var(--red); font-weight: 800; }
.score-ring { width: 132px; aspect-ratio: 1; margin: 1rem auto; border: 12px solid var(--blue); border-radius: 50%; display: grid; place-items: center; background: #e8edf4; }
.score-ring::before { content: attr(data-score); display: grid; place-items: center; width: 98px; aspect-ratio: 1; border-radius: 50%; background: #fff; font-size: 2rem; font-weight: 850; }
.ticket { display: grid; grid-template-columns: repeat(5,auto); gap: 1rem; align-items: center; font-size: .78rem; }
.definition-list { display: grid; grid-template-columns: minmax(110px,.7fr) 1.3fr; gap: .45rem 1rem; margin: 0; }
.definition-list dt { color: var(--muted); font-size: .83rem; font-weight: 700; }
.definition-list dd { margin: 0; word-break: break-word; }
.status { display: inline-flex; align-items: center; min-height: 24px; border-radius: 3px; padding: .1rem .4rem; font-weight: 750; font-size: .72rem; }
.status-high { background: #ffeaec; color: #9e212b; }
.status-medium { background: #fff3db; color: #8b5e00; }
.status-low { background: #eaf9f0; color: #146b3c; }

.content-layout { display: grid; grid-template-columns: minmax(0,1fr) 280px; gap: 1rem; }
.lesson { background: #fff; border: 1px solid var(--line); padding: clamp(1.25rem,4vw,3rem); }
.lesson h1 { font-size: clamp(2rem,4vw,3.5rem); line-height: 1.08; letter-spacing: -.05em; }
.lesson h2 { margin-top: 2.4rem; font-size: 1.55rem; }
.lesson p, .lesson li { max-width: 75ch; }
.callout { margin: 1.3rem 0; padding: 1rem 1.2rem; border-left: 4px solid var(--cyan); background: #edfaff; }
.command { display: block; background: var(--terminal); color: #ddecf7; border-radius: 6px; padding: 1rem; overflow-x: auto; font: .86rem/1.6 "SFMono-Regular", Consolas, monospace; }
.lesson-aside { align-self: start; position: sticky; top: 1rem; }
.toc { list-style: none; padding: 0; margin: 0; display: grid; gap: .45rem; font-size: .85rem; }

.lab-layout { display: grid; grid-template-columns: 250px minmax(400px,1fr) 310px; gap: .8rem; }
.lab-topology, .lab-instructions { color: #fff; background: var(--ink); border: 1px solid #173d6e; border-radius: 7px; padding: 1rem; }
.lab-device { width: 100%; border: 1px solid #2c648f; background: #0a2a58; color: #fff; padding: .7rem; margin-bottom: .55rem; border-radius: 5px; text-align: left; }
.lab-device.active { border-color: var(--cyan); box-shadow: 0 0 0 2px rgba(19,189,227,.22); }
.demo-link { height: 75px; margin-left: 50%; border-left: 2px solid #65e082; position: relative; }
.demo-link-label { position: absolute; left: 8px; top: 25px; font-size: .75rem; }
.cli { display: flex; flex-direction: column; min-height: 580px; background: #050b12; color: #e5edf5; border: 1px solid #173d6e; border-radius: 7px; overflow: hidden; }
.cli-head { background: #081c34; padding: .75rem 1rem; border-bottom: 1px solid #274563; }
.cli-output { flex: 1; overflow: auto; padding: 1rem; white-space: pre-wrap; font: .86rem/1.55 "SFMono-Regular", Consolas, monospace; }
.cli-input-row { display: flex; align-items: center; gap: .5rem; padding: .65rem 1rem; border-top: 1px solid #28435f; }
.cli-prompt { color: #7ee08e; font: .86rem "SFMono-Regular", Consolas, monospace; }
.cli-input { flex: 1; border: 0; outline: 0; background: transparent; color: #fff; font: .86rem "SFMono-Regular", Consolas, monospace; }
.cli-safe { padding: .6rem 1rem; background: #09213c; color: #bcd1e5; font-size: .75rem; }
.lab-instructions h2, .lab-instructions h3 { margin-top: 0; }
.lab-instructions ol { padding-left: 1.25rem; }
.validation-list { list-style: none; padding: 0; }
.validation-list li { display: flex; gap: .5rem; margin: .5rem 0; }
.validation-list .pass::before { content: "✓"; color: #70e287; }
.validation-list .pending::before { content: "○"; color: #fff; }
.trainer { grid-column: 1 / -1; background: #fff; border: 1px solid var(--line); padding: 1rem; }
.trainer-grid { display: grid; grid-template-columns: .7fr 1.5fr .65fr; gap: 1.2rem; align-items: center; }
.trainer-fields { display: grid; grid-template-columns: repeat(2,1fr); gap: .65rem; }
.trainer .field { margin: 0; }
.feedback { min-height: 1.5rem; font-weight: 700; }
.feedback.ok { color: var(--green); }
.feedback.bad { color: var(--red); }

.question-shell { display: grid; grid-template-columns: minmax(0,760px) 260px; justify-content: center; gap: 1rem; }
.question-card { background: #fff; border: 1px solid var(--line); padding: clamp(1.2rem,4vw,2.4rem); }
.question-card h1 { font-size: 1.5rem; line-height: 1.35; }
.question-list-card { margin-bottom: 1rem; }
.question-list-card h2 { font-size: 1.25rem; }
.options { display: grid; gap: .6rem; margin: 1.3rem 0; }
.option { display: flex; gap: .75rem; width: 100%; text-align: left; border: 1px solid #b6c4d5; background: #fff; color: var(--ink); border-radius: 6px; padding: .8rem; }
.option:hover, .option.selected { border-color: var(--blue); background: #eef5ff; }
.option.correct { border-color: var(--green); background: #effaf4; }
.option.incorrect { border-color: var(--red); background: #fff1f2; }
.explanation { padding: 1rem; background: #f3f8ff; border-left: 4px solid var(--blue); }
.question-nav { display: grid; grid-template-columns: repeat(5,1fr); gap: .35rem; }
.question-nav button { aspect-ratio: 1; border: 1px solid var(--line); border-radius: 4px; background: #fff; font-size: .72rem; }
.question-nav button.active { color: #fff; background: var(--blue); border-color: var(--blue); }
.score-summary { display: flex; align-items: center; gap: 1.4rem; margin: 1.5rem 0; }

.admin-layout { display: grid; grid-template-columns: var(--sidebar) 1fr; min-height: 100vh; }
.admin-table-wrap { overflow-x: auto; border: 1px solid var(--line); background: #fff; }
.admin-table { width: 100%; border-collapse: collapse; font-size: .84rem; }
.admin-table th, .admin-table td { text-align: left; padding: .72rem .8rem; border-bottom: 1px solid var(--line); white-space: nowrap; }
.admin-table th { color: var(--muted); background: #f8fafd; font-size: .74rem; text-transform: uppercase; letter-spacing: .035em; }
.catalog-filter { margin: 0; }
.metric-strip { display: grid; grid-template-columns: repeat(4,1fr); border: 1px solid var(--line); background: #fff; margin-bottom: 1rem; }
.metric { padding: 1.1rem; border-right: 1px solid var(--line); }
.metric:last-child { border: 0; }
.metric strong { display: block; font-size: 1.7rem; }
.admin-actions { display: flex; flex-wrap: wrap; gap: .65rem; margin-bottom: 1rem; }
.admin-form-panel { margin-top: 1rem; }
.mock-shell { display: grid; gap: 1rem; }
.mock-toolbar { position: sticky; z-index: 20; top: .5rem; display: flex; align-items: center; justify-content: space-between; gap: 1rem; box-shadow: var(--shadow); }
.mock-timer { font-size: 1.35rem; font-weight: 850; }
.mock-question.is-marked { border-color: #b56a00; box-shadow: inset 4px 0 0 #b56a00; }
.mock-review-mark { width: fit-content; margin-bottom: .6rem; }
.checkpoint-card.is-complete { border-color: var(--green); }
.topology-text, .solution-block { white-space: pre-line; }
.plan-columns { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 1rem; }
.subnav { display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: 1rem; }
.subnav a { padding: .45rem .7rem; border: 1px solid var(--line); border-radius: 5px; background: #fff; text-decoration: none; }
.certificate-sheet { max-width: 900px; margin-inline: auto; text-align: center; border: 8px double var(--ink); }
.certificate-kicker { color: var(--blue); font-weight: 850; letter-spacing: .08em; text-transform: uppercase; }
.certificate-disclaimer { margin-top: 2rem; text-align: left; }
.certificate-actions { justify-content: center; }
.notes-area { width: 100%; min-height: 180px; padding: .65rem; border: 1px solid var(--line); border-radius: 5px; resize: vertical; }
.tutor-answer { display: block; white-space: pre-wrap; margin-top: 1rem; padding: 1rem; border-left: 4px solid var(--blue); background: #f3f8ff; }

.seo-article { width: min(calc(100% - 2rem), 820px); margin: 0 auto; padding: 4rem 0; }
.seo-article h1 { font-size: clamp(2.5rem,6vw,4.8rem); line-height: 1.02; letter-spacing: -.055em; }
.seo-article h2 { margin-top: 2.7rem; font-size: 1.8rem; }
.seo-article p, .seo-article li { color: #263b5b; font-size: 1.05rem; }
.source-list { font-size: .86rem; word-break: break-word; }
.cookie-banner { position: fixed; z-index: 60; left: 1rem; right: 1rem; bottom: 1rem; max-width: 720px; margin-inline: auto; padding: 1rem; background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow); }

@media (max-width: 1050px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-copy { max-width: 760px; }
  .topology-window { max-width: 760px; }
  .dashboard-grid { grid-template-columns: 1fr 1fr; }
  .panel-wide { grid-column: auto; }
  .lab-layout { grid-template-columns: 220px 1fr; }
  .lab-instructions { grid-column: 1 / -1; }
  .trainer-grid { grid-template-columns: 1fr 1.6fr; }
  .trainer-grid > :last-child { grid-column: 1 / -1; }
}

@media (max-width: 820px) {
  .nav-toggle { display: inline-flex; }
  .nav-links { display: none; position: absolute; inset: 76px 0 auto; padding: 1rem; background: #fff; border-bottom: 1px solid var(--line); flex-direction: column; align-items: stretch; }
  .nav-links.open { display: flex; }
  .method-grid { grid-template-columns: 1fr 1fr; }
  .method:nth-child(2) { border-right: 0; }
  .method:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .price-panel { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .app-layout, .admin-layout { grid-template-columns: 1fr; }
  .sidebar { position: fixed; z-index: 80; inset: 0 auto 0 0; width: min(88vw,var(--sidebar)); transform: translateX(-105%); transition: transform .2s ease; box-shadow: var(--shadow); }
  .sidebar.open { transform: translateX(0); }
  .mobile-sidebar { display: inline-flex; }
  .content-layout { grid-template-columns: 1fr; }
  .lesson-aside { position: static; }
  .lab-layout { grid-template-columns: 1fr; }
  .lab-topology, .lab-instructions { grid-column: auto; }
  .question-shell { grid-template-columns: 1fr; }
  .metric-strip { grid-template-columns: 1fr 1fr; }
  .metric:nth-child(2) { border-right: 0; }
  .metric:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .seo-highlights, .plan-columns { grid-template-columns: 1fr; }
  .mock-toolbar { position: static; flex-wrap: wrap; }
}

@media (max-width: 580px) {
  .container { width: min(calc(100% - 1.25rem),var(--max)); }
  .brand strong { font-size: 1.4rem; }
  .brand small { display: none; }
  .hero { padding-top: 2.7rem; }
  .hero h1 { font-size: clamp(2.65rem,14vw,4rem); }
  .hero-actions .btn { width: 100%; }
  .hero-proof { grid-template-columns: 1fr 1fr; }
  .topology-canvas { min-height: 310px; padding: .4rem; }
  .topology-map { min-height: 300px; transform: scale(.88); transform-origin: center; }
  .method-grid, .dashboard-grid, .metric-strip { grid-template-columns: 1fr; }
  .method { border-right: 0; border-bottom: 1px solid var(--line); }
  .method:last-child { border-bottom: 0; }
  .curriculum { columns: 1; }
  .panel, .panel-wide, .panel-full { grid-column: 1; }
  .timeline { grid-template-columns: repeat(4,1fr); }
  .ticket { grid-template-columns: 1fr 1fr; }
  .trainer-grid, .trainer-fields { grid-template-columns: 1fr; }
  .trainer-grid > :last-child { grid-column: auto; }
  .app-main { padding-inline: .7rem; }
  .app-top { align-items: center; }
}

@media print {
  .site-header, .site-footer, .sidebar, .app-actions, .btn, .cookie-banner { display: none !important; }
  .app-layout, .admin-layout { display: block; }
  .app-main { padding: 0; }
  body { background: #fff; color: #000; }
  a { color: #000; text-decoration: none; }
  .panel, .lesson { border-color: #aaa; break-inside: avoid; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
}

@media (forced-colors: active) {
  :focus-visible { outline: 3px solid Highlight; box-shadow: none; }
}