/* Grarvumfel · Hallmark: macrostructure=ruled exercise book (one paper column with red margin, subject sheets, grade-target calculator, tips), nav=register tabs fixed at the right edge, palette=paper/line blue/margin red/highlighter yellow, type=Figtree + Kalam */
:root{--bg:#EEF1F6;--paper:#FFFDF7;--line:#C7D7F0;--margin:#E26B5D;--ink:#1F2A44;--ink2:#4C5670;--ink3:#8089A0;--yel:#FFF1A8;--yel2:#F7D95B;--blue:#2F5DA8;--rule:rgba(31,42,68,.14);--sans:"Figtree","Segoe UI",sans-serif;--hand:"Kalam","Comic Sans MS",cursive;--w:860px;
--cmp-bg:#FFFDF7;--cmp-ink:#1F2A44;--cmp-accent:#2F5DA8;--cmp-on-accent:#fff;--cmp-line:rgba(31,42,68,.22)}
*{box-sizing:border-box}html{scroll-behavior:smooth}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:17px;line-height:1.68;overflow-x:clip}
img{max-width:100%;height:auto;display:block}a{color:var(--blue)}h1,h2,h3{font-weight:800;line-height:1.2;margin:0 0 .5em;letter-spacing:-.01em}h2{font-size:clamp(1.55rem,3vw,2.15rem)}h3{font-size:1.2rem}
.gf-visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}.gf-skip{position:absolute;left:-999px;top:8px;background:var(--ink);color:#fff;padding:.5rem 1rem;z-index:2000}.gf-skip:focus{left:8px}
.gf-hand{font-family:var(--hand);color:var(--margin);font-weight:700}.gf-lead{font-size:1.08rem;color:var(--ink2)}
.gf-btn{display:inline-flex;align-items:center;min-height:48px;padding:0 1.4rem;border-radius:10px;background:var(--ink);color:#fff;text-decoration:none;font-weight:700;border:2px solid var(--ink);box-shadow:3px 3px 0 var(--yel2)}.gf-btn:hover{transform:translate(1px,1px);box-shadow:2px 2px 0 var(--yel2)}.gf-btn:focus-visible{outline:3px solid var(--margin);outline-offset:2px}.gf-btn--line{background:transparent;color:var(--ink);box-shadow:none}
figure{margin:0}figcaption{font-size:.84rem;color:var(--ink3);margin-top:.5rem;font-family:var(--hand)}
/* top */
.gf-top{background:var(--ink);color:#fff}.gf-top__in{max-width:var(--w);margin:0 auto;padding:.7rem 24px;display:flex;justify-content:space-between;align-items:center;gap:1rem;flex-wrap:wrap}
.gf-top__brand{margin:0;font-size:1.3rem}.gf-top__brand a{display:inline-grid;grid-template-columns:auto auto;gap:0 .6rem;align-items:center;color:#fff;text-decoration:none;font-weight:800}.gf-top__brand svg{grid-row:1/3}.gf-top__brand small{font-size:.7rem;font-weight:500;color:#B9C4DC;letter-spacing:.03em}
.gf-top__tel{margin:0;text-align:right;display:grid;line-height:1.2}.gf-top__tel a{color:#fff;font-weight:800;text-decoration:none;font-size:1.05rem}.gf-top__tel small{font-size:.72rem;color:#B9C4DC}
/* register tabs */
.gf-tabs{position:fixed;right:0;top:120px;z-index:800;display:grid;gap:4px}.gf-tabs a{display:block;background:var(--paper);color:var(--ink);text-decoration:none;font-weight:700;font-size:.8rem;padding:.45rem .8rem .45rem .9rem;border:1px solid var(--rule);border-right:0;border-radius:10px 0 0 10px;box-shadow:-2px 2px 6px rgba(31,42,68,.12);transform:translateX(6px);transition:transform .2s,background .2s;min-height:36px}
.gf-tabs a:nth-child(odd){background:#FDF5D8}.gf-tabs a:hover,.gf-tabs a.is-current{transform:translateX(0);background:var(--yel)}.gf-tabs a:focus-visible{outline:3px solid var(--margin);transform:translateX(0)}
/* paper */
.gf-paper{max-width:var(--w);margin:2rem auto 3rem;background:var(--paper);background-image:linear-gradient(transparent 31px,var(--line) 31px,var(--line) 32px);background-size:100% 32px;background-position:0 12px;border:1px solid var(--rule);border-radius:4px;box-shadow:0 20px 40px -30px rgba(31,42,68,.5);position:relative;padding:2.5rem 3rem 3rem 4.2rem}
.gf-paper::before{content:"";position:absolute;top:0;bottom:0;left:3.2rem;width:2px;background:var(--margin);opacity:.7}.gf-paper::after{content:"";position:absolute;top:0;bottom:0;left:0;width:1.6rem;background:radial-gradient(circle,var(--bg) 5px,transparent 6px) 50% 0/16px 96px repeat-y;opacity:.9}
.gf-paper p,.gf-paper li{background:transparent}
/* cover */
.gf-cover{padding-bottom:2rem;border-bottom:2px dashed var(--rule)}.gf-cover__lines{display:grid;gap:.2rem;margin:0 0 1.6rem;font-size:.9rem}.gf-cover__lines p{margin:0;display:flex;gap:.6rem;align-items:baseline;border-bottom:1px solid var(--ink);padding-bottom:.1rem;max-width:520px}.gf-cover__lines span{color:var(--ink3);font-size:.78rem;letter-spacing:.08em;text-transform:uppercase;flex:none}.gf-cover__lines b{font-size:1.15rem;font-weight:400}
.gf-cover h2{font-size:clamp(1.8rem,3.6vw,2.6rem);background:linear-gradient(transparent 55%,var(--yel) 55%,var(--yel) 92%,transparent 92%);display:inline;line-height:1.35;padding:0 .2em;box-decoration-break:clone;-webkit-box-decoration-break:clone}.gf-cover .gf-lead{margin-top:1.2rem}
.gf-cover__cta{display:flex;gap:1rem;flex-wrap:wrap;margin:1.2rem 0 1.6rem}.gf-cover__fig img{width:100%;aspect-ratio:16/9;object-fit:cover;border:1px solid var(--rule);transform:rotate(-.6deg);box-shadow:0 10px 24px -16px rgba(31,42,68,.6)}
/* why */
.gf-why{padding:2rem 0;border-bottom:2px dashed var(--rule)}.gf-why__grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1.4rem}.gf-why__grid h3{font-size:1.05rem}.gf-why__grid p{margin:0;font-size:.95rem;color:var(--ink2)}
/* subjects */
.gf-subjects{padding:2rem 0 1rem}.gf-sec__lead{color:var(--ink2);max-width:62ch}
.gf-sheet{margin:1.6rem 0 0;padding:1.4rem 1.5rem 1.2rem;background:#fff;border:1px solid var(--rule);border-radius:3px 3px 3px 14px;box-shadow:0 10px 24px -20px rgba(31,42,68,.5);position:relative;scroll-margin-top:16px}.gf-sheet::after{content:"";position:absolute;right:-1px;bottom:-1px;width:28px;height:28px;background:linear-gradient(225deg,var(--paper) 50%,#E7E2D4 50%);border-radius:14px 0 3px 0}
.gf-sheet__tab{margin:0 0 .3rem;font-family:var(--hand);color:var(--margin);font-size:.95rem}.gf-sheet__lead{color:var(--ink2);margin:0 0 1rem}
.gf-sheet__grid{display:grid;grid-template-columns:minmax(0,1fr) 220px;gap:1.5rem;align-items:start}.gf-sheet__list{margin:0;padding-left:1.1rem;color:var(--ink2);font-size:.96rem}.gf-sheet__list li{margin:.35rem 0}.gf-sheet__fig img{width:100%;aspect-ratio:4/3;object-fit:cover;border:1px solid var(--rule);transform:rotate(1.2deg)}.gf-sheet__fig figcaption{font-size:.76rem}
.gf-sheet__note{margin:1.1rem 0 0;padding:.7rem 1rem;background:var(--yel);font-size:.93rem;border-left:4px solid var(--yel2)}
/* sections */
.gf-sec{padding:2.2rem 0 1rem;border-top:2px dashed var(--rule);margin-top:1.6rem;scroll-margin-top:16px}.gf-sec--yellow{background:var(--yel);margin:1.6rem -3rem 0 -4.2rem;padding:2.2rem 3rem 2.2rem 4.2rem;border-top:0}.gf-sec--yellow h2{background:none}
/* calc */
.gf-calc{background:#fff;border:1px solid var(--rule);border-radius:12px;padding:1.4rem;margin-top:1.2rem;display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:1.5rem}
.gf-calc__grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.8rem}.gf-field{display:grid;gap:.3rem;font-size:.78rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--ink3)}.gf-field--wide{grid-column:1/-1}.gf-field select{font:inherit;font-size:1rem;text-transform:none;letter-spacing:0;font-weight:600;color:var(--ink);min-height:46px;border:2px solid var(--ink);border-radius:8px;background:var(--paper);padding:0 .6rem;width:100%;min-width:0}.gf-field input[type=range]{width:100%;accent-color:var(--blue);height:30px}.gf-field output{color:var(--ink);font-size:1rem}
.gf-calc__out{background:var(--paper);border:2px dashed var(--rule);border-radius:10px;padding:1.2rem 1.3rem;display:grid;align-content:start;gap:.6rem}.gf-calc__big{margin:0;font-size:1.3rem;font-weight:700}.gf-calc__big b{font-size:2.6rem;font-family:var(--hand);color:var(--margin);line-height:1;margin-right:.2rem}.gf-calc__big small{display:block;font-size:.9rem;font-weight:500;color:var(--ink2)}
.gf-calc__msg{margin:0;font-size:.95rem;color:var(--ink);min-height:4.5em}.gf-calc__hint{margin:0;font-size:.8rem;color:var(--ink3)}
/* steps */
.gf-steps{list-style:none;counter-reset:s;margin:0 0 1.5rem;padding:0;display:grid;gap:.6rem}.gf-steps li{counter-increment:s;display:grid;grid-template-columns:44px minmax(0,1fr);gap:0 .9rem;padding:.6rem 0;border-bottom:1px solid var(--rule)}.gf-steps li::before{content:counter(s) ".";grid-row:1/3;font-family:var(--hand);font-size:1.8rem;color:var(--margin);line-height:1.1}.gf-steps b{grid-column:2;font-size:1.05rem}.gf-steps span{grid-column:2;color:var(--ink2);font-size:.96rem}
.gf-wide img{width:100%;aspect-ratio:16/8;object-fit:cover;border:1px solid var(--rule)}
/* prices */
.gf-prices{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--rule)}.gf-prices th,.gf-prices td{padding:.65rem .9rem;border-bottom:1px solid var(--rule);text-align:left;vertical-align:top}.gf-prices th{font-weight:700}.gf-prices th small{display:block;font-weight:400;font-size:.82rem;color:var(--ink3)}.gf-prices td{text-align:right;font-family:var(--hand);font-size:1.35rem;color:var(--ink);white-space:nowrap;width:1%}.gf-prices tr:nth-child(even){background:#FBF8EE}
.gf-example{margin:1.2rem 0 0;background:#fff;border:1px solid var(--rule);padding:.9rem 1.1rem;font-size:.95rem;color:var(--ink2)}
/* tips */
.gf-tips{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.9rem;margin-bottom:1.5rem}.gf-tip{background:#fff;border:1px solid var(--rule);padding:1rem 1.1rem;border-top:4px solid var(--yel2)}.gf-tip h3{font-size:1.02rem}.gf-tip p{margin:0;font-size:.92rem;color:var(--ink2)}.gf-tip:last-child{grid-column:1/-1}
.gf-duo{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1.2rem}.gf-duo img{width:100%;aspect-ratio:4/3;object-fit:cover;border:1px solid var(--rule)}
/* faq */
.gf-faq{display:grid;gap:.4rem}.gf-faq__item{background:#fff;border:1px solid var(--rule);padding:0 1.1rem}.gf-faq__item summary{cursor:pointer;padding:.85rem 0;font-weight:700;list-style:none;display:flex;justify-content:space-between;gap:1rem}.gf-faq__item summary::-webkit-details-marker{display:none}.gf-faq__item summary::after{content:"+";font-family:var(--hand);color:var(--margin);font-size:1.3rem;line-height:1}.gf-faq__item[open] summary::after{content:"−"}.gf-faq__item p{margin:0 0 1rem;color:var(--ink2);font-size:.96rem}
/* abo */
.gf-sec--abo{padding-bottom:0}.gf-form{background:#fff;border:2px solid var(--ink);padding:1.4rem;margin-top:1.2rem;min-width:0;box-shadow:5px 5px 0 var(--yel2)}.gf-form__trap{position:absolute;left:-9999px}.gf-form__row{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:.6rem;align-items:end}.gf-form__label{grid-column:1/-1;font-size:.78rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--ink3)}
.gf-form__input{min-width:0;width:100%;min-height:50px;border:0;border-bottom:2px solid var(--ink);background:transparent;color:var(--ink);padding:0 .3rem;font:inherit;font-size:1.05rem;border-radius:0}.gf-form__input:focus{outline:0;border-color:var(--blue);background:var(--yel)}.gf-form__input[aria-invalid=true]{border-color:var(--margin)}
.gf-form__btn{min-height:50px;border:2px solid var(--ink);background:var(--ink);color:#fff;font:inherit;font-weight:700;padding:0 1.2rem;cursor:pointer;border-radius:10px}.gf-form__btn:hover{background:var(--blue);border-color:var(--blue)}.gf-form__btn[disabled]{opacity:.6;cursor:wait}
.gf-form__status{min-height:1.4em;font-size:.92rem;margin:.6rem 0 0}.gf-form__status[data-state=error]{color:var(--margin);font-weight:700}.gf-form__note{font-size:.82rem;color:var(--ink3);margin:.4rem 0 0}
/* foot */
.gf-foot{background:var(--ink);color:#C9D1E3;padding:3rem 0 2rem}.gf-foot__in{max-width:var(--w);margin:0 auto;padding:0 24px;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:2.5rem}.gf-foot h2{font-size:1.15rem;color:#fff}.gf-foot p{font-size:.92rem}.gf-foot a{color:#fff}
.gf-foot__brand{display:flex;align-items:center;gap:.5rem;font-weight:800;color:#fff;font-size:1.2rem!important}.gf-foot__legal{display:flex;flex-wrap:wrap;gap:.3rem 1rem;margin:1rem 0}.gf-foot__legal a,.gf-foot__legal button{color:#fff;font:inherit;font-size:.9rem;background:none;border:0;padding:0;cursor:pointer;text-decoration:underline}.gf-foot__small{font-size:.8rem!important;color:#94A0BF}
.gf-map{margin-top:1rem;aspect-ratio:16/10;border-radius:10px;background:var(--paper);color:var(--ink);position:relative;overflow:hidden}.gf-map iframe{position:absolute;inset:0;width:100%;height:100%;border:0}.gf-map [data-map-placeholder]{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:center;gap:.5rem;padding:1.2rem;font-size:.9rem}.gf-map [data-map-placeholder] p{margin:0}.gf-map a{color:var(--blue)}.gf-map button{align-self:flex-start;min-height:42px;padding:0 1rem;border-radius:8px;border:0;background:var(--ink);color:#fff;font:inherit;font-weight:700;cursor:pointer}.gf-map small{color:var(--ink3);font-size:.76rem}
/* doc/done */
.gf-doc h1{font-size:2rem}.gf-doc h2{font-size:1.3rem;margin-top:2rem}.gf-doc .lead{color:var(--ink2);font-size:1.05rem}.gf-doc table{width:100%;border-collapse:collapse;font-size:.92rem;margin:1rem 0;background:#fff}.gf-doc th,.gf-doc td{border:1px solid var(--rule);padding:.6rem .8rem;text-align:left;vertical-align:top}.gf-doc th{background:#FBF8EE}.gf-doc .meta{color:var(--ink3);font-size:.88rem}.gf-doc code{background:var(--yel);padding:.1em .4em}
.gf-done{padding:2rem 0}.gf-done h1{font-size:clamp(1.9rem,4vw,2.6rem)}
@media(max-width:1100px){.gf-tabs{position:static;display:flex;flex-wrap:wrap;gap:.3rem;max-width:var(--w);margin:1rem auto 0;padding:0 24px}.gf-tabs a{transform:none;border-radius:999px;border:1px solid var(--rule);box-shadow:none;padding:.35rem .8rem}}
@media(max-width:760px){body{font-size:16.5px}.gf-paper{margin:1rem 12px 2rem;padding:1.6rem 1.1rem 2rem 2.4rem}.gf-paper::before{left:1.8rem}.gf-paper::after{width:1.1rem;background-size:12px 80px}.gf-why__grid,.gf-sheet__grid,.gf-calc,.gf-calc__grid,.gf-tips,.gf-duo,.gf-foot__in{grid-template-columns:minmax(0,1fr)}.gf-sec--yellow{margin:1.6rem -1.1rem 0 -2.4rem;padding:1.8rem 1.1rem 1.8rem 2.4rem}.gf-sheet{padding:1.1rem 1rem}.gf-sheet__fig img{aspect-ratio:16/9}.gf-form__row{grid-template-columns:minmax(0,1fr)}.gf-prices td{font-size:1.15rem}.gf-doc table{display:block;overflow-x:auto}.gf-top__tel{text-align:left}}

/* consent manager */
.gf-bar{position:fixed;left:0;right:0;bottom:0;z-index:1300;background:var(--cmp-bg,#fff);color:var(--cmp-ink,#111);border-top:3px solid var(--cmp-accent,#111);box-shadow:0 -20px 50px -30px rgba(0,0,0,.5);font-size:.92rem;line-height:1.5}.gf-bar[hidden]{display:none}
.gf-bar__in{max-width:1200px;margin:0 auto;padding:1rem 1.25rem;display:flex;gap:1.5rem;align-items:center;flex-wrap:wrap}.gf-bar__text{flex:1 1 32rem}.gf-bar__text a{color:inherit;text-decoration:underline}
.gf-bar__btns{display:flex;gap:.5rem;flex-wrap:wrap}.gf-bar__btns button,.gf-bar__panelbtns button{min-height:44px;padding:0 1.1rem;border-radius:6px;border:2px solid var(--cmp-accent,#111);background:var(--cmp-accent,#111);color:var(--cmp-on-accent,#fff);font:inherit;font-weight:700;cursor:pointer}
.gf-bar__btns .gf-bar__more,.gf-bar__link{background:transparent!important;color:var(--cmp-ink,#111)!important;border-color:var(--cmp-line,rgba(0,0,0,.3))!important}.gf-bar__link{border:0!important;text-decoration:underline;font-weight:500!important}
.gf-bar__panel{max-width:1200px;margin:0 auto;padding:0 1.25rem 1.2rem;display:grid;gap:.8rem}.gf-bar__panel[hidden]{display:none}.gf-bar__panel fieldset{border:1px solid var(--cmp-line,rgba(0,0,0,.15));border-radius:8px;padding:.7rem 1rem;margin:0}.gf-bar__panel legend{font-weight:700;padding:0 .4rem}.gf-bar__panel legend label{display:flex;gap:.5rem;align-items:center;cursor:pointer}.gf-bar__panel input{width:18px;height:18px;accent-color:var(--cmp-accent,#111)}.gf-bar__panel p{margin:.3rem 0 0;font-size:.86rem;opacity:.85}
.gf-bar__panelbtns{display:flex;gap:1rem;align-items:center;flex-wrap:wrap}.gf-bar__panelbtns small{flex-basis:100%;opacity:.7}
@media(max-width:640px){.gf-bar__in{padding:.8rem 1rem}.gf-bar__btns button{min-height:40px;padding:0 .8rem;font-size:.85rem}}