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12px)}body{margin:0;background:var(--color-bg);color:var(--color-text);font-family:var(--font-text);font-size:var(--fs-body);line-height:var(--lh-body);overflow-x:hidden}img,svg{max-width:100%}a{color:var(--color-primary);text-underline-offset:3px}a:hover{color:var(--color-primary-hover)}h1,h2,h3,h4{font-family:var(--font-display);line-height:var(--lh-tight);margin:0 0 var(--space-3);color:var(--color-heading);font-weight:var(--fw-bold);letter-spacing:-.015em}h1{font-weight:var(--fw-heavy);letter-spacing:-.025em}h1{font-size:var(--fs-h1)}h2{font-size:var(--fs-h2)}h3{font-size:var(--fs-h3)}p{margin:0 0 var(--space-4)}ul,ol{padding-left:1.3em;margin:0 0 var(--space-4)}li+li{margin-top:6px}:focus-visible{outline:3px solid 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16px}.container-narrow{max-width:var(--container-narrow)}.section{padding:var(--space-7) 0}.section-tight{padding:var(--space-6) 0}.section-alt{background:var(--color-surface);border-top:1px solid var(--color-divider);border-bottom:1px solid var(--color-divider)}.stack>*+*{margin-top:var(--space-4)}.grid{display:grid;gap:var(--space-4)}.grid-2{grid-template-columns:repeat(auto-fit,minmax(min(100%,300px),1fr))}.grid-3{grid-template-columns:repeat(auto-fit,minmax(min(100%,280px),1fr))}.grid-4{grid-template-columns:repeat(auto-fit,minmax(min(100%,240px),1fr))}.row{display:flex;flex-wrap:wrap;gap:var(--space-3);align-items:center}.row-between{justify-content:space-between}.section-head{margin-bottom:var(--space-5);max-width:720px}.section-head p{color:var(--color-text-secondary);font-size:var(--fs-body-lg)}.eyebrow{display:inline-flex;gap:8px;align-items:center;font-size:var(--fs-label);font-weight:var(--fw-bold);color:var(--color-primary);text-transform:uppercase;letter-spacing:.06em;margin-bottom:var(--space-2)}.eyebrow:before{content:"";width:18px;height:3px;border-radius:2px;background:var(--color-accent)}.eyebrow-plain:before{display:none}.site-header{position:sticky;top:0;z-index:50;background:#fffffffa;border-bottom:1px solid var(--color-divider);box-shadow:var(--shadow-sm)}.header-inner{display:flex;align-items:center;gap:var(--space-4);min-height:var(--header-h)}.logo{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--color-heading);font-weight:var(--fw-heavy);font-size:1.2rem;letter-spacing:-.02em;white-space:nowrap}.logo-mark{width:36px;height:36px;flex:none}.logo b{color:var(--color-primary);font-weight:var(--fw-heavy)}.logo-inverse{color:#fff}.logo-inverse b{color:#a9c6ea}.nav{display:none;flex:1;align-items:center;justify-content:space-between;gap:var(--space-3)}.nav-list{display:flex;gap:2px;list-style:none;margin:0;padding:0}.nav-list li+li{margin-top:0}.nav-link{position:relative;display:inline-flex;align-items:center;gap:6px;min-height:44px;padding:8px 10px;border-radius:var(--radius-sm);color:var(--color-text-secondary);text-decoration:none;font-weight:var(--fw-semibold);font-size:var(--fs-body-sm);white-space:nowrap}.nav-link:hover{background:var(--color-surface-hover);color:var(--color-heading)}.nav-link[aria-current=page],.nav-link.is-active{color:var(--color-primary)}.nav-link[aria-current=page]:after{content:"";position:absolute;left:10px;right:10px;bottom:4px;height:2px;border-radius:2px;background:var(--color-primary)}.nav-cta{white-space:nowrap}.nav-actions{display:flex;align-items:center;gap:var(--space-2)}.lang-switch{display:inline-flex;align-items:center;gap:6px;min-height:44px;padding:6px 12px;border:1px solid var(--color-border);border-radius:var(--radius-pill);color:var(--color-heading);text-decoration:none;font-weight:var(--fw-semibold);font-size:var(--fs-body-sm);background:var(--color-surface);font-family:inherit;cursor:pointer}.lang-switch:hover{border-color:var(--color-border-strong)}.menu-toggle{margin-left:auto;display:inline-flex;align-items:center;gap:8px;min-height:var(--tap);padding:8px 14px;border:1px solid var(--color-border);border-radius:var(--radius);background:var(--color-surface);font:inherit;font-weight:700;color:var(--color-text);cursor:pointer}.mobile-nav{border-top:1px solid var(--color-divider);background:var(--color-surface);max-height:calc(100vh - var(--header-h));overflow-y:auto}.mobile-nav ul{list-style:none;margin:0;padding:var(--space-3) 16px var(--space-5);display:grid;gap:4px}.mobile-nav li+li{margin-top:0}.mobile-nav a{display:flex;align-items:center;gap:12px;min-height:var(--tap);padding:10px 12px;border-radius:var(--radius-sm);text-decoration:none;color:var(--color-text);font-weight:700}.mobile-nav a:hover,.mobile-nav a[aria-current=page]{background:var(--color-primary-softer);color:var(--color-primary)}.mobile-nav .m-tile{width:36px;height:36px;border-radius:10px;background:var(--color-primary-soft);color:var(--color-primary);display:inline-grid;place-items:center}.mobile-nav .m-extra{display:flex;flex-wrap:wrap;gap:var(--space-2);padding:0 16px var(--space-5)}@media(min-width:1280px){.nav{display:flex}.menu-toggle,.mobile-nav{display:none!important}}.tabbar{position:fixed;left:0;right:0;bottom:0;z-index:40;display:grid;grid-template-columns:repeat(4,1fr);background:var(--color-surface);border-top:1px solid var(--color-divider);padding-bottom:env(safe-area-inset-bottom)}.tabbar a{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;min-height:58px;font-size:.78rem;font-weight:700;color:var(--color-text-secondary);text-decoration:none}.tabbar a[aria-current=page]{color:var(--color-primary)}.tabbar .icon{width:22px;height:22px}body{padding-bottom:64px}@media(min-width:1280px){.tabbar{display:none}body{padding-bottom:0}}body[data-focus-mode] .tabbar{display:none}body[data-focus-mode]{padding-bottom:0}.breadcrumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;margin:0;padding:var(--space-3) 0 0;font-size:var(--fs-label);color:var(--color-text-muted)}.breadcrumbs li+li{margin-top:0}.breadcrumbs li+li:before{content:"/";margin-right:6px;color:var(--color-border-strong)}.breadcrumbs a{color:var(--color-text-secondary)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:var(--tap);padding:10px 20px;border-radius:var(--radius);border:2px solid transparent;font:inherit;font-weight:var(--fw-semibold);font-size:1rem;line-height:1.2;text-decoration:none;cursor:pointer;transition:background-color .15s,border-color .15s,color .15s;text-align:center}.btn-primary{background:var(--color-primary);color:#fff}.btn-primary:hover{background:var(--color-primary-hover);color:#fff}.btn-primary:active{background:var(--color-primary-active)}.btn-secondary{background:var(--color-surface);color:var(--color-primary);border-color:var(--color-primary)}.btn-secondary:hover{background:var(--color-primary-softer);color:var(--color-primary-hover)}.btn-ghost{background:var(--color-surface);color:var(--color-text-secondary);border-color:var(--color-border)}.btn-ghost:hover{background:var(--color-surface-hover);color:var(--color-text)}.btn-success{background:var(--color-success);color:#fff}.btn-success:hover{background:#12603b;color:#fff}.btn-danger{background:var(--color-surface);color:var(--color-error);border-color:var(--color-error-line)}.btn-danger:hover{background:var(--color-error-soft)}.btn-warning{background:var(--color-surface);color:var(--color-warning);border-color:var(--color-warning-line)}.btn-miss{background:var(--color-surface);color:var(--color-error);border-color:var(--color-error-line)}.btn-miss:hover{background:var(--color-error-soft);color:var(--color-error)}.btn-inverse{background:#fff;color:var(--color-navy)}.btn-inverse:hover{background:var(--blue-50);color:var(--color-navy)}.btn-outline-inverse{background:transparent;color:#fff;border-color:#ffffffb3}.btn-outline-inverse:hover{background:#ffffff1a;color:#fff}.btn-warning:hover{background:var(--color-warning-soft)}.btn-lg{min-height:56px;padding:14px 26px;font-size:1.1rem}.btn-sm{min-height:40px;padding:6px 14px;font-size:var(--fs-body-sm)}.btn-block{width:100%}.btn[disabled],.btn[aria-disabled=true]{background:var(--color-disabled-bg);color:var(--color-disabled-text);border-color:var(--color-border);cursor:not-allowed}.btn-row{display:flex;flex-wrap:wrap;gap:var(--space-3)}.link-btn{background:none;border:0;padding:0;font:inherit;color:var(--color-primary);text-decoration:underline;cursor:pointer}.hero{position:relative;overflow:hidden;padding:var(--space-8) 0 var(--space-7);background:var(--color-ink-band);color:var(--color-text-inverse)}.hero h1{font-size:var(--fs-display);max-width:16ch;color:#fff}.hero .eyebrow{color:#c9d5e6}.hero-lead{font-size:var(--fs-body-lg);color:var(--color-text-inverse-muted);max-width:56ch}.hero a:not(.btn){color:#fff}.hero-grid{position:relative;z-index:1;display:grid;gap:var(--space-6);align-items:center}@media(min-width:900px){.hero-grid{grid-template-columns:1.35fr 1fr}}.hero-panel{background:var(--color-surface);color:var(--color-text);border-radius:var(--radius-lg);padding:var(--space-5);box-shadow:0 10px 30px #0814284d}.hero-panel h2{color:var(--color-heading)}.hero-stars{position:absolute;right:-40px;top:-30px;width:420px;height:420px;opacity:.09;color:#fff;pointer-events:none}.hero-stripes{position:absolute;left:0;right:0;bottom:0;height:8px;background:repeating-linear-gradient(90deg,var(--color-accent) 0 48px,#fff 48px 64px);opacity:.9}.trust-list{list-style:none;padding:0;margin-top:var(--space-5);display:flex;flex-wrap:wrap;gap:10px 20px;color:#dbe5f1;font-weight:var(--fw-semibold);font-size:var(--fs-body-sm)}.trust-list li{display:inline-flex;gap:6px;align-items:center;margin:0}.trust-list .icon{color:#8fd6a8}.page-head{padding:var(--space-6) 0 var(--space-4)}.page-head p.lead{font-size:var(--fs-body-lg);color:var(--color-text-secondary);max-width:65ch}.card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:var(--space-5);box-shadow:var(--shadow-sm)}.card-accent{border-top:3px solid var(--color-accent)}.card h2,.card h3{margin-bottom:var(--space-2)}.card>:last-child{margin-bottom:0}.card-link{display:flex;flex-direction:column;gap:var(--space-2);text-decoration:none;color:var(--color-text);transition:border-color .15s,box-shadow .15s}.card-link:hover{border-color:var(--color-primary);box-shadow:var(--shadow);color:var(--color-text)}.card-link p{color:var(--color-text-secondary);margin:0}.card-link .go{margin-top:auto;padding-top:var(--space-2);font-weight:700;color:var(--color-primary);display:inline-flex;gap:6px;align-items:center}.tile{width:44px;height:44px;border-radius:12px;display:inline-grid;place-items:center;background:var(--color-primary-soft);color:var(--color-primary);flex:none}.tile .icon{width:24px;height:24px}.tile-gold{background:var(--color-accent-soft);color:var(--color-accent)}.tile-green{background:var(--color-success-soft);color:var(--color-success)}.tile-red{background:var(--color-accent-soft);color:var(--color-accent)}.card-featured{border:2px solid var(--color-primary)}.course-card .meta{display:flex;flex-wrap:wrap;gap:8px}.badge{display:inline-flex;align-items:center;gap:4px;padding:3px 10px;border-radius:var(--radius-pill);font-size:var(--fs-caption);font-weight:700;background:var(--color-surface-sunken);color:var(--color-text-secondary);border:1px solid 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14px;border:2px solid var(--color-border);border-radius:var(--radius);font:inherit;background:var(--color-surface);color:var(--color-text)}input:focus,select:focus,textarea:focus{border-color:var(--color-focus);outline:none;box-shadow:0 0 0 4px var(--color-focus-ring)}textarea{min-height:110px;resize:vertical}fieldset{border:0;padding:0;margin:0 0 var(--space-5)}legend{font-weight:700;font-size:var(--fs-h3);margin-bottom:var(--space-3);padding:0}.choice-list{display:grid;gap:var(--space-2)}.choice{display:flex;gap:var(--space-3);align-items:flex-start;padding:14px 16px;border:2px solid var(--color-border);border-radius:var(--radius);background:var(--color-surface);cursor:pointer;font-weight:700;min-height:var(--tap)}.choice input{width:22px;height:22px;margin-top:2px;flex:none;accent-color:var(--color-primary)}.choice:hover{border-color:var(--color-border-strong)}.choice:has(input:checked){border-color:var(--color-primary);background:var(--color-primary-softer)}.choice small{display:block;font-weight:400;color:var(--color-text-muted)}.chips{display:flex;flex-wrap:wrap;gap:var(--space-2)}.chip{display:inline-flex;align-items:center;gap:6px;min-height:40px;padding:6px 14px;border:1px solid var(--color-border);border-radius:var(--radius-pill);background:var(--color-surface);font:inherit;font-size:var(--fs-body-sm);font-weight:700;color:var(--color-text-secondary);cursor:pointer;text-decoration:none}.chip[aria-pressed=true],.chip.is-active{background:var(--color-primary);color:#fff;border-color:var(--color-primary)}.toolbar{display:flex;flex-wrap:wrap;gap:var(--space-3);align-items:end;margin-bottom:var(--space-4)}.toolbar .field{margin:0;flex:1 1 200px}.bar{height:12px;border-radius:var(--radius-pill);background:var(--color-bg-soft);overflow:hidden;border:1px solid var(--color-divider)}.bar>span{display:block;height:100%;background:var(--color-primary);border-radius:inherit;transition:width 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#e2e9f6}}body{overflow-wrap:break-word}select{max-width:100%}.q-list>li,.q-item{min-width:0}@media(max-width:400px){.topic-question-nav{flex-wrap:wrap;justify-content:space-between}.topic-q-numbers{order:-1;width:100%}}[data-app=flashcards]:has(>[data-loading]){min-height:930px}[data-app=topic-practice]:has(>[data-loading]){min-height:1450px}[data-app=mock-test]:has(>[data-loading]){min-height:755px}@media(min-width:768px){[data-app=flashcards]:has(>[data-loading]){min-height:730px}[data-app=topic-practice]:has(>[data-loading]){min-height:1010px}[data-app=mock-test]:has(>[data-loading]){min-height:615px}}@media(min-width:1024px){[data-app=topic-practice]:has(>[data-loading]){min-height:675px}}.contact-form{margin-top:var(--space-4)}.contact-form [aria-invalid=true]{border-color:var(--color-error, #b42318)}.contact-hp{position:absolute;left:-10000px;width:1px;height:1px;overflow:hidden}.contact-status{margin:12px 0 0;min-height:1.5em;font-weight:600}.contact-status.is-success{color:var(--color-success, #067647)}.contact-status.is-error{color:var(--color-error, #b42318)}.contact-form input[type=file]{max-width:100%;padding:8px;cursor:pointer}.contact-files{margin:8px 0 0;padding-left:1.2em;overflow-wrap:anywhere}