@font-face{font-family:Caveat;font-style:normal;font-display:swap;font-weight:500;src:url(../media/caveat-cyrillic-ext-500-normal.0gw8hcvt601.h.woff2)format("woff2"),url(../media/caveat-cyrillic-ext-500-normal.0mln2uqhj6n0x.woff)format("woff");unicode-range:U+460-52F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:Caveat;font-style:normal;font-display:swap;font-weight:500;src:url(../media/caveat-cyrillic-500-normal.06.vx5jo24n1_.woff2)format("woff2"),url(../media/caveat-cyrillic-500-normal.0unj1g1-kro-d.woff)format("woff");unicode-range:U+301,U+400-45F,U+490-491,U+4B0-4B1,U+2116}@font-face{font-family:Caveat;font-style:normal;font-display:swap;font-weight:500;src:url(../media/caveat-latin-ext-500-normal.0i.n~p~8g-8gq.woff2)format("woff2"),url(../media/caveat-latin-ext-500-normal.0mle2f4mz4hf2.woff)format("woff");unicode-range:U+100-2BA,U+2BD-2C5,U+2C7-2CC,U+2CE-2D7,U+2DD-2FF,U+304,U+308,U+329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:Caveat;font-style:normal;font-display:swap;font-weight:500;src:url(../media/caveat-latin-500-normal.0v0p4mjalx3aw.woff2)format("woff2"),url(../media/caveat-latin-500-normal.0-s96w88g8kb_.woff)format("woff");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:Caveat;font-style:normal;font-display:swap;font-weight:600;src:url(../media/caveat-cyrillic-ext-600-normal.0xv33hytsyv7s.woff2)format("woff2"),url(../media/caveat-cyrillic-ext-600-normal.0.175l4kpc99h.woff)format("woff");unicode-range:U+460-52F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:Caveat;font-style:normal;font-display:swap;font-weight:600;src:url(../media/caveat-cyrillic-600-normal.0wsrtp~bm4wy~.woff2)format("woff2"),url(../media/caveat-cyrillic-600-normal.10kqqtsfjpkve.woff)format("woff");unicode-range:U+301,U+400-45F,U+490-491,U+4B0-4B1,U+2116}@font-face{font-family:Caveat;font-style:normal;font-display:swap;font-weight:600;src:url(../media/caveat-latin-ext-600-normal.17e1je9cawzd_.woff2)format("woff2"),url(../media/caveat-latin-ext-600-normal.12yg28rxly1gi.woff)format("woff");unicode-range:U+100-2BA,U+2BD-2C5,U+2C7-2CC,U+2CE-2D7,U+2DD-2FF,U+304,U+308,U+329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:Caveat;font-style:normal;font-display:swap;font-weight:600;src:url(../media/caveat-latin-600-normal.0rcm8jv-~bijd.woff2)format("woff2"),url(../media/caveat-latin-600-normal.0nky59sc7.q2h.woff)format("woff");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@layer theme{:root,:host{--font-sans:ui-sans-serif, system-ui, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";--font-mono:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;--spacing:.25rem;--default-font-family:var(--font-sans);--default-mono-font-family:var(--font-mono)}}@layer base{*,:after,:before,::backdrop{box-sizing:border-box;border:0 solid;margin:0;padding:0}::file-selector-button{box-sizing:border-box;border:0 solid;margin:0;padding:0}html,:host{-webkit-text-size-adjust:100%;tab-size:4;line-height:1.5;font-family:var(--default-font-family,ui-sans-serif, system-ui, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji");font-feature-settings:var(--default-font-feature-settings,normal);font-variation-settings:var(--default-font-variation-settings,normal);-webkit-tap-highlight-color:transparent}hr{height:0;color:inherit;border-top-width:1px}abbr:where([title]){-webkit-text-decoration:underline dotted;text-decoration:underline dotted}h1,h2,h3,h4,h5,h6{font-size:inherit;font-weight:inherit}a{color:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;text-decoration:inherit}b,strong{font-weight:bolder}code,kbd,samp,pre{font-family:var(--default-mono-font-family,ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace);font-feature-settings:var(--default-mono-font-feature-settings,normal);font-variation-settings:var(--default-mono-font-variation-settings,normal);font-size:1em}small{font-size:80%}sub,sup{vertical-align:baseline;font-size:75%;line-height:0;position:relative}sub{bottom:-.25em}sup{top:-.5em}table{text-indent:0;border-color:inherit;border-collapse:collapse}:-moz-focusring{outline:auto}progress{vertical-align:baseline}summary{display:list-item}ol,ul,menu{list-style:none}img,svg,video,canvas,audio,iframe,embed,object{vertical-align:middle;display:block}img,video{max-width:100%;height:auto}button,input,select,optgroup,textarea{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}::file-selector-button{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}:where(select:is([multiple],[size])) optgroup{font-weight:bolder}:where(select:is([multiple],[size])) optgroup option{padding-inline-start:20px}::file-selector-button{margin-inline-end:4px}::placeholder{opacity:1}@supports (not ((-webkit-appearance:-apple-pay-button))) or (contain-intrinsic-size:1px){::placeholder{color:currentColor}@supports (color:color-mix(in lab, red, red)){::placeholder{color:color-mix(in oklab, currentcolor 50%, transparent)}}}textarea{resize:vertical}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-date-and-time-value{min-height:1lh;text-align:inherit}::-webkit-datetime-edit{display:inline-flex}::-webkit-datetime-edit-fields-wrapper{padding:0}::-webkit-datetime-edit{padding-block:0}::-webkit-datetime-edit-year-field{padding-block:0}::-webkit-datetime-edit-month-field{padding-block:0}::-webkit-datetime-edit-day-field{padding-block:0}::-webkit-datetime-edit-hour-field{padding-block:0}::-webkit-datetime-edit-minute-field{padding-block:0}::-webkit-datetime-edit-second-field{padding-block:0}::-webkit-datetime-edit-millisecond-field{padding-block:0}::-webkit-datetime-edit-meridiem-field{padding-block:0}::-webkit-calendar-picker-indicator{line-height:1}:-moz-ui-invalid{box-shadow:none}button,input:where([type=button],[type=reset],[type=submit]){appearance:button}::file-selector-button{appearance:button}::-webkit-inner-spin-button{height:auto}::-webkit-outer-spin-button{height:auto}[hidden]:where(:not([hidden=until-found])){display:none!important}}@layer components;@layer utilities{.visible{visibility:visible}.relative{position:relative}.start{inset-inline-start:var(--spacing)}.end{inset-inline-end:var(--spacing)}.table{display:table}}:root{--paper:#f8f5ec;--paper-strong:#fffdf7;--ink:#071d4a;--blue:#0758ff;--blue-soft:#e9f0ff;--line:#0a4dd3;--muted:#5e6b86;--lime:#b7ff16;--green:#137a45;--red:#c5323a;--shadow:7px 7px 0 #0758ff}*{box-sizing:border-box}html{scroll-behavior:smooth}body{color:var(--ink);background-color:var(--paper);font-family:var(--font-geist-sans), "Segoe UI", Arial, sans-serif;background-image:linear-gradient(#0758ff11 1px,#0000 1px),linear-gradient(90deg,#0758ff11 1px,#0000 1px),linear-gradient(#0758ff07 1px,#0000 1px),linear-gradient(90deg,#0758ff07 1px,#0000 1px);background-size:32px 32px,32px 32px,8px 8px,8px 8px;margin:0}button,input,textarea{font:inherit}button{color:inherit}.site-shell{min-height:100vh}.topbar{-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);z-index:20;background:#fffdf7ed;border-bottom:1px solid #0758ffb3;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:18px;min-height:82px;padding:0 2.5vw;display:grid;position:sticky;top:0}.brand{letter-spacing:.04em;cursor:pointer;background:0 0;border:0;justify-self:start;padding:0;font-family:Arial Narrow,Roboto Condensed,Impact,sans-serif;font-size:clamp(1.35rem,2.1vw,2rem);font-weight:900;font-stretch:75%}nav{justify-content:center;align-items:center;gap:5px;display:flex}nav button{cursor:pointer;background:0 0;border:0;padding:12px;font-weight:740;position:relative}nav button:not(:last-child):after{content:"·";color:var(--blue);position:absolute;right:-8px}nav button:hover,nav button.nav-active{color:var(--blue)}.exam-chip{border:1.5px solid var(--blue);background:var(--paper-strong);color:var(--blue);cursor:pointer;border-radius:7px;justify-self:end;padding:11px 20px;font-weight:740;box-shadow:2px 2px #0758ff21}.training-layout{grid-template-columns:minmax(0,1fr) 360px;align-items:start;gap:54px;width:min(1380px,94vw);margin:0 auto;padding:42px 0 70px;display:grid}.eyebrow{color:var(--blue);letter-spacing:.06em;text-transform:uppercase;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.86rem;font-weight:800}.eyebrow span{padding:0 8px}h1{letter-spacing:-.02em;max-width:940px;margin:14px 0 24px;font-family:Arial Narrow,Roboto Condensed,Impact,sans-serif;font-size:clamp(2.25rem,4vw,4.4rem);line-height:1.02}.problem-card{border:1.7px solid var(--line);box-shadow:var(--shadow);background:#fffdf7e8;border-radius:10px;margin-bottom:32px;padding:20px 28px 18px}.problem-meta{color:var(--muted);justify-content:space-between;align-items:baseline;gap:24px;font-size:.78rem;display:flex}.problem-meta strong{color:var(--ink);text-align:right;font-size:.95rem}.problem-card>svg{width:100%;max-height:175px;color:var(--ink);margin:6px 0;display:block}.problem-card svg text{fill:currentColor;font:600 18px ui-monospace,monospace}.problem-card svg .diagram-blue{fill:var(--blue);font-style:italic}.diagram-point{fill:var(--blue);stroke:var(--blue)}.givens{letter-spacing:.02em;border-top:1px solid #0758ff2e;padding-top:13px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:clamp(.9rem,1.4vw,1.08rem)}.concept-graphic{background-color:#fffef9;background-image:linear-gradient(#0758ff09 1px,#0000 1px),linear-gradient(90deg,#0758ff09 1px,#0000 1px),none;background-position:0 0,0 0,0 0;background-repeat:repeat,repeat,repeat;background-size:16px 16px;background-attachment:scroll,scroll,scroll;background-origin:padding-box,padding-box,padding-box;background-clip:border-box,border-box,border-box;border:1px solid #0758ff52;border-radius:8px;margin:18px 0 0;padding:15px 17px 13px}.concept-head{justify-content:space-between;align-items:baseline;gap:18px;margin-bottom:4px;display:flex}.concept-head span{color:var(--blue);letter-spacing:.07em;font:850 .68rem ui-monospace,monospace}.concept-head strong{text-align:right;font-size:.95rem}.concept-graphic svg{width:100%;height:auto;max-height:230px;color:var(--ink);margin:3px 0;display:block;overflow:visible}.concept-graphic figcaption{color:var(--muted);margin:2px 0 0;font-size:.84rem;line-height:1.45}.concept-graphic svg text{font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.concept-graphic .axis-label{fill:var(--ink);font-size:15px;font-weight:800}.concept-graphic .graph-label,.concept-graphic .flow-text,.concept-graphic .critical-label,.concept-graphic .region-label{fill:var(--ink);font-size:13px;font-weight:700}.concept-graphic .flow-title{fill:var(--ink);font-size:14px;font-weight:900}.concept-graphic .matrix-text{fill:var(--ink);font-size:16px;font-weight:800}.concept-graphic .note-text{fill:var(--ink);font-size:12px;font-weight:800}.concept-graphic .mass-label{fill:#fff;font-size:15px;font-weight:850}.concept-graphic .eigen-line{fill:none;stroke:var(--ink);stroke-width:3px}.concept-graphic .order-line{fill:none;stroke:#7596d8;stroke-width:2.4px;stroke-dasharray:8 5}.concept-graphic .second-order{opacity:.72}.concept-graphic .active-graph,.concept-graphic .response-line,.concept-graphic .decay-line,.concept-graphic .sin-line,.concept-graphic .mode-arrow,.concept-graphic .force-vector{fill:none;stroke:var(--blue);stroke-width:3.4px}.concept-graphic .order-label{fill:var(--blue);font-size:14px;font-weight:900}.concept-graphic .critical-point,.concept-graphic .peak-point,.concept-graphic .sin-point{fill:var(--lime);stroke:var(--ink);stroke-width:2px}.concept-graphic .critical-guide,.concept-graphic .resonance-guide,.concept-graphic .measure-line,.concept-graphic .component-line{fill:none;stroke:var(--blue);stroke-width:1.8px;stroke-dasharray:6 5}.concept-graphic .graph-note,.concept-graphic .sin-note{fill:var(--blue-soft);stroke:var(--blue);stroke-width:1.2px}.concept-graphic .danger-note{fill:#fff1ef;stroke:var(--red);stroke-width:1.3px}.concept-graphic .danger-text{fill:var(--red);font-size:13px;font-weight:900}.concept-graphic .envelope-line{fill:none;stroke:#8290aa;stroke-width:1.8px;stroke-dasharray:7 5}.concept-graphic .cos-line{fill:none;stroke:var(--ink);stroke-width:2.8px}.concept-graphic .cos-point{fill:var(--paper-strong);stroke:var(--ink);stroke-width:2px}.concept-graphic .cos-note{fill:#f0f2f7;stroke:var(--ink);stroke-width:1.1px}.concept-graphic .flow-box{fill:#fffdf7f5;stroke:#5275ba;stroke-width:1.7px}.concept-graphic .accent-box{fill:var(--blue-soft);stroke:var(--blue);stroke-width:2px}.concept-graphic .flow-arrow{fill:none;stroke:var(--blue);stroke-width:2.5px}.concept-graphic .mode-mass{fill:var(--ink);stroke:var(--blue);stroke-width:2px}.concept-graphic .gear-wheel,.concept-graphic .rotor-circle,.concept-graphic .lever-line{fill:none;stroke:var(--ink);stroke-width:2.8px}.concept-graphic .gear-wheel{stroke-dasharray:10 4}.concept-graphic .force-vector{stroke-width:4px}.pulse-point{transform-box:fill-box;transform-origin:50%;animation:1.7s ease-in-out infinite pulse-point}@keyframes pulse-point{50%{opacity:.72;transform:scale(1.65)}}.answers{gap:14px;display:grid}.answer{text-align:left;cursor:pointer;background:#fffdf7eb;border:1.5px solid #315caa;border-radius:9px;grid-template-columns:52px 1fr;align-items:center;gap:20px;width:100%;min-height:72px;padding:10px 24px;font-size:1.06rem;font-weight:680;transition:transform .15s,border-color .15s,box-shadow .15s;display:grid;box-shadow:0 3px 8px #071d4a0d}.answer:hover{border-color:var(--blue);transform:translate(3px);box-shadow:3px 3px #0758ff2e}.answer-number{border:1.5px solid;border-radius:50%;place-items:center;width:42px;height:42px;font-family:ui-monospace,monospace;font-weight:700;display:grid}.answer-correct,.answer-reveal{border-color:var(--green);background:#effaf2}.answer-wrong{border-color:var(--red);background:#fff1ef}.feedback{background:var(--paper-strong);border:1.5px solid;border-radius:8px;justify-content:space-between;align-items:center;gap:20px;margin-top:18px;padding:18px 20px;display:flex}.feedback-correct{border-color:var(--green)}.feedback-wrong{border-color:var(--red)}.feedback-label{text-transform:uppercase;letter-spacing:.06em;font-family:ui-monospace,monospace;font-size:.78rem;font-weight:900}.feedback p{margin:5px 0 0;line-height:1.55}.feedback button,.professor-section form button,.exam-panel>button{border:1.5px solid var(--blue);background:var(--blue);color:#fff;cursor:pointer;white-space:nowrap;border-radius:6px;padding:12px 18px;font-weight:800}.session-card{border:1.7px solid var(--line);background:#fffdf7eb;border-radius:10px;padding:28px;position:sticky;top:116px}.training-side{align-self:start;gap:20px;min-width:0;display:grid}.training-side .session-card{position:static}.session-head span{margin-bottom:8px;font-size:1.2rem;display:block}.session-head strong{letter-spacing:.05em;font-family:ui-monospace,monospace;font-size:3rem}.progress-track,.mastery-track{background:var(--ink);border-radius:999px;height:18px;margin:18px 0;overflow:hidden}.progress-track span,.mastery-track span{background:linear-gradient(90deg, #9cff16, var(--lime));height:100%;transition:width .4s;display:block}.hearts{gap:13px;font-size:2.5rem;line-height:1;display:flex}.heart-full{color:var(--blue)}.heart-empty{color:#0000;-webkit-text-stroke:1.5px var(--ink)}.session-divider{border-top:1px solid #0758ff3d;margin:28px 0}.session-card h2{margin:0 0 16px;font-size:1.1rem}.tag-list{flex-wrap:wrap;gap:9px;display:flex}.tag-list span{border:1.3px solid var(--blue);background:#fff;border-radius:7px;padding:8px 12px;font-size:.83rem;font-weight:700}.points{justify-content:space-between;align-items:end;display:flex}.points span{font-weight:720}.points strong{color:var(--blue);font:800 1.7rem ui-monospace,monospace}.hint-text{border-left:4px solid var(--lime);background:#f2fcdc;padding:12px;font-size:.9rem;line-height:1.45}.hint-button,.skip-button{border:1.5px solid var(--blue);cursor:pointer;background:0 0;border-radius:6px;width:100%;margin-top:15px;padding:11px;font-weight:750}.hint-button:hover{background:var(--blue);color:#fff}.skip-button{color:var(--muted);border-color:#0000;font-size:.82rem}.ai-question-button{border:1.5px solid var(--ink);background:var(--lime);width:100%;color:var(--ink);cursor:pointer;box-shadow:3px 3px 0 var(--ink);border-radius:7px;margin-top:20px;padding:13px 16px;font-weight:900;transition:transform .14s,box-shadow .14s}.ai-question-button:hover{box-shadow:5px 5px 0 var(--ink);transform:translate(-1px,-1px)}.ai-question-button span{color:var(--blue);margin-right:7px}.learning-hint{border:1.7px solid var(--blue);background:#fffdf7f5;border-radius:10px;margin:-4px 0 30px;padding:22px;box-shadow:5px 5px #0758ff33}.learning-hint-copy{border-left:5px solid var(--lime);padding:3px 0 3px 16px}.learning-hint-label{color:var(--blue);letter-spacing:.08em;text-transform:uppercase;font:900 .74rem ui-monospace,monospace}.learning-hint-copy p{margin:7px 0 0;font-weight:720;line-height:1.55}.learning-hint .concept-graphic{margin-top:18px}.learning-hint-side{margin:0;padding:20px;position:relative}.learning-hint-side .concept-graphic{margin-top:14px}.learning-hint-side .book-note{padding:14px 15px}.learning-hint-side .book-note ul{padding-left:17px;font-size:.88rem}.side-hint-close{width:30px;height:30px;color:var(--blue);cursor:pointer;background:#fff;border:1px solid #0758ff59;border-radius:50%;font-size:1.25rem;line-height:1;position:absolute;top:9px;right:10px}.book-note{border:1.5px solid var(--ink);background:#f2fcdc;border-radius:8px;margin-top:17px;padding:18px 20px}.book-note>span{color:var(--blue);letter-spacing:.08em;text-transform:uppercase;font:900 .72rem ui-monospace,monospace;display:block}.book-note>strong{margin-top:7px;display:block}.book-note ul{color:#253557;margin:10px 0 0;padding-left:20px;line-height:1.55}.book-note li+li{margin-top:6px}.ai-backdrop{z-index:60;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);background:#071d4a94;place-items:center;padding:24px;display:grid;position:fixed;inset:0}.ai-dialog{border:2px solid var(--blue);background:linear-gradient(#0758ff0a 1px, transparent 1px), linear-gradient(90deg, #0758ff0a 1px, transparent 1px), var(--paper-strong);width:min(720px,96vw);max-height:min(820px,92vh);box-shadow:10px 10px 0 var(--blue);background-size:24px 24px;border-radius:12px;padding:34px;position:relative;overflow:auto}.ai-dialog h2{margin:10px 42px 9px 0;font-family:Arial Narrow,Impact,sans-serif;font-size:clamp(2rem,5vw,3rem);line-height:1}.ai-dialog>p{color:var(--muted);line-height:1.55}.ai-dialog label{text-transform:uppercase;gap:8px;margin-top:22px;font:850 .78rem ui-monospace,monospace;display:grid}.ai-dialog textarea{min-height:112px;font-family:var(--font-geist-sans), "Segoe UI", sans-serif;text-transform:none;font-size:1rem}.ai-close{border:1.5px solid var(--ink);cursor:pointer;background:#fff;border-radius:50%;width:38px;height:38px;font-size:1.6rem;line-height:1;position:absolute;top:16px;right:18px}.ai-context{background:#fffc;border:1px solid #bdc8dd;border-radius:7px;margin:17px 0}.ai-context summary{cursor:pointer;padding:12px 14px;font-weight:800}.ai-context pre{white-space:pre-wrap;max-height:210px;color:var(--muted);border-top:1px solid #d7deeb;margin:0;padding:14px;font:650 .76rem/1.5 ui-monospace,monospace;overflow:auto}.ai-actions{justify-content:flex-end;gap:12px;margin-top:18px;display:flex}.ai-actions button{border:1.5px solid var(--blue);cursor:pointer;border-radius:7px;padding:12px 17px;font-weight:850}.ai-copy-button{color:var(--blue);background:#fff}.ai-open-button{background:var(--blue);color:#fff}.ai-dialog small{color:var(--muted);margin-top:15px;line-height:1.45;display:block}.content-page{width:min(1260px,92vw);margin:0 auto;padding:60px 0 90px}.content-page .lead{max-width:760px;color:var(--muted);margin:-6px 0 35px;font-size:1.1rem;line-height:1.7}.type-grid{grid-template-columns:repeat(2,1fr);gap:18px;display:grid}.type-card{border:1.5px solid var(--line);background:#fffdf7eb;border-radius:9px;grid-template-columns:48px 1fr auto;align-items:start;gap:18px;padding:24px;display:grid}.type-index{color:var(--blue);font:800 1.1rem ui-monospace,monospace}.type-card h2{margin:0 0 9px;font-size:1.3rem}.type-card p{color:var(--muted);margin:0 0 13px;line-height:1.55}.type-card small{color:var(--blue);font:700 .75rem ui-monospace,monospace}.type-card button{color:var(--blue);cursor:pointer;background:0 0;border:0;align-self:center;font-weight:800}.visual-page{width:min(1380px,94vw)}.visual-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;display:grid}.visual-card{border:1.5px solid var(--line);background:#fffdf7f0;border-radius:10px;padding:18px;box-shadow:4px 4px #0758ff26}.visual-card .concept-graphic{margin-top:0}.visual-card .concept-head,.visual-card .concept-graphic figcaption{display:none}.visual-card-copy{padding:15px 8px 5px}.visual-card-copy h2{margin:0 0 8px;font-size:1.35rem}.visual-card-copy p{color:var(--muted);margin:0 0 14px;line-height:1.55}.visual-card-copy button{color:var(--blue);cursor:pointer;background:0 0;border:0;padding:0;font-weight:850}.quiz-page{width:min(1320px,94vw);margin:0 auto;padding:52px 0 90px}.quiz-topline{justify-content:space-between;align-items:flex-start;gap:40px;display:flex}.quiz-topline h1{max-width:980px;margin-bottom:16px}.quiz-counter{border:1.5px solid var(--blue);background:var(--paper-strong);min-width:180px;box-shadow:4px 4px 0 var(--blue);border-radius:9px;padding:18px}.quiz-counter span,.quiz-counter small{display:block}.quiz-counter span{text-transform:uppercase;color:var(--blue);font:850 .72rem ui-monospace,monospace}.quiz-counter strong{margin:5px 0;font:900 1.8rem ui-monospace,monospace;display:block}.quiz-counter small{color:var(--muted);line-height:1.4}.quiz-progress{background:#cfd8e9;border-radius:999px;height:8px;margin:10px 0 32px;overflow:hidden}.quiz-progress span{background:var(--blue);height:100%;transition:width .3s;display:block}.quiz-layout{grid-template-columns:minmax(0,1fr) 285px;align-items:start;gap:34px;display:grid}.quiz-statements{gap:15px;display:grid}.quiz-statement{background:#fffdf7f0;border:1.5px solid #315caa;border-radius:9px;padding:20px;transition:border-color .15s,background .15s}.quiz-statement-head{grid-template-columns:38px 1fr;align-items:start;gap:14px;display:grid}.quiz-statement-head p{margin:4px 0 14px;font-weight:720;line-height:1.55}.quiz-number{border:1.5px solid var(--ink);border-radius:50%;place-items:center;width:34px;height:34px;font:850 .85rem ui-monospace,monospace;display:grid}.truth-buttons{gap:10px;padding-left:52px;display:flex}.truth-buttons button{border:1.5px solid var(--blue);min-width:112px;color:var(--blue);cursor:pointer;background:#fff;border-radius:6px;padding:10px 17px;font-weight:850}.truth-buttons button:hover:not(:disabled),.truth-buttons button.truth-selected{background:var(--blue);color:#fff}.truth-buttons button:disabled{cursor:default}.quiz-statement-correct{border-color:var(--green);background:#effaf2}.quiz-statement-wrong{border-color:var(--red);background:#fff1ef}.quiz-explanation{border-top:1px solid #071d4a29;margin:16px 0 0 52px;padding-top:13px}.quiz-explanation strong{color:var(--blue);font-size:.88rem}.quiz-statement-wrong .quiz-explanation strong{color:var(--red)}.quiz-explanation p{color:var(--muted);margin:6px 0 0;line-height:1.5}.quiz-actions{justify-content:flex-end;margin-top:5px;display:flex}.quiz-check{border:1.5px solid var(--blue);background:var(--blue);color:#fff;cursor:pointer;border-radius:7px;min-width:210px;padding:13px 19px;font-weight:900}.quiz-check:disabled{cursor:not-allowed;background:#aab5c9;border-color:#aab5c9}.quiz-side{border:1.7px solid var(--blue);background:#fffdf7f0;border-radius:10px;padding:24px;position:sticky;top:116px}.quiz-side>span,.quiz-side>small{display:block}.quiz-side>span{font-weight:760}.quiz-side>strong{margin-top:6px;font:900 2.2rem ui-monospace,monospace;display:block}.quiz-side>small{color:var(--muted);line-height:1.45}.quiz-learning-hint{margin:2px 0 0}.professor-section{border:1.5px solid var(--line);background:var(--paper-strong);box-shadow:var(--shadow);border-radius:10px;grid-template-columns:.8fr 1.2fr;gap:40px;margin-top:60px;padding:34px;display:grid}.professor-section h2{margin:10px 0;font-family:Arial Narrow,Impact,sans-serif;font-size:2.2rem}.professor-section p{color:var(--muted);line-height:1.6}.professor-section form{gap:14px;display:grid}.professor-section label,.exam-panel label{text-transform:uppercase;gap:7px;font-family:ui-monospace,monospace;font-size:.8rem;font-weight:800;display:grid}textarea,input[type=date]{color:var(--ink);resize:vertical;background:#fff;border:1.3px solid #6d83ad;border-radius:6px;min-height:76px;padding:12px}input[type=date]{min-height:44px}.custom-questions{grid-column:1/-1;gap:8px;display:grid}.custom-questions details{border-top:1px solid #c3cee0;padding:14px 4px}.custom-questions summary{cursor:pointer;font-weight:750}.stats-grid{grid-template-columns:repeat(3,1fr);gap:18px;margin:34px 0;display:grid}.stats-grid article{border:1.5px solid var(--line);background:var(--paper-strong);border-radius:8px;padding:24px}.stats-grid span,.stats-grid small{display:block}.stats-grid span{font-weight:760}.stats-grid strong{color:var(--blue);margin:12px 0 5px;font:850 3rem ui-monospace,monospace;display:block}.stats-grid small{color:var(--muted)}.progress-panel{grid-template-columns:1.3fr .7fr;gap:22px;display:grid}.progress-list,.exam-panel{border:1.5px solid var(--line);background:#fffdf7f0;border-radius:8px;padding:28px}.progress-list h2,.exam-panel h2{margin:0 0 24px}.mastery-row{margin-bottom:19px}.mastery-row>div:first-child{justify-content:space-between;font-weight:720;display:flex}.mastery-track{height:10px;margin:8px 0 0}.exam-panel p{color:var(--muted);line-height:1.55}.exam-panel label{margin:22px 0}.reset-button{width:100%;margin-top:10px;color:var(--red)!important;border-color:var(--red)!important;background:0 0!important}footer{width:min(1380px,94vw);color:var(--muted);border-top:1px solid #0758ff47;justify-content:space-between;gap:20px;margin:0 auto;padding:24px 0 34px;font:650 .76rem ui-monospace,monospace;display:flex}.training-mode-switch{justify-content:space-between;align-items:center;gap:20px;width:min(1380px,94vw);margin:27px auto -16px;display:flex}.training-mode-switch>span{color:var(--muted);letter-spacing:.07em;text-transform:uppercase;font:800 .74rem ui-monospace,monospace}.training-mode-switch>div{border:1.5px solid var(--blue);background:#fffdf7f0;border-radius:9px;padding:4px;display:flex}.training-mode-switch button{text-align:left;cursor:pointer;background:0 0;border:0;border-radius:6px;min-width:215px;padding:9px 16px}.training-mode-switch button strong,.training-mode-switch button small{display:block}.training-mode-switch button strong{font-size:.9rem}.training-mode-switch button small{color:var(--muted);margin-top:2px;font-size:.7rem}.training-mode-switch button.mode-active{background:var(--blue);color:#fff}.training-mode-switch button.mode-active small{color:#dfe8ff}.calculation-page{width:min(1380px,94vw);margin:0 auto;padding:52px 0 90px}.calculation-heading{grid-template-columns:1fr 190px;align-items:end;gap:40px;display:grid}.calculation-heading h1{margin-bottom:13px}.calculation-heading p{max-width:780px;color:var(--muted);margin:0;font-size:1.05rem;line-height:1.6}.calculation-score{border:1.5px solid var(--blue);background:var(--paper-strong);box-shadow:4px 4px 0 var(--blue);border-radius:9px;padding:18px 20px}.calculation-score span,.calculation-score small{display:block}.calculation-score span{color:var(--blue);text-transform:uppercase;font:850 .72rem ui-monospace,monospace}.calculation-score strong{margin:4px 0;font:900 1.8rem ui-monospace,monospace;display:block}.calculation-score small{color:var(--muted)}.calculation-progress{background:#cfd8e9;border-radius:999px;height:8px;margin:28px 0 32px;overflow:hidden}.calculation-progress span{background:linear-gradient(90deg, var(--blue), #5e91ff);height:100%;transition:width .3s;display:block}.calculation-layout{grid-template-columns:minmax(0,1fr) 330px;align-items:start;gap:34px;display:grid}.calculation-main{gap:22px;display:grid}.calc-problem-card,.calc-step-card,.calc-sidebar{border:1.7px solid var(--line);background:#fffdf7f2;border-radius:10px}.calc-problem-card{padding:21px 25px;box-shadow:5px 5px #0758ff2e}.calc-problem-card>div:first-child{color:var(--muted);justify-content:space-between;gap:18px;font-size:.78rem;display:flex}.calc-problem-card>div:first-child strong{color:var(--blue)}.calc-problem-card h2{margin:17px 0 14px;font-size:1.35rem}.calc-givens{flex-wrap:wrap;gap:8px;display:flex}.calc-givens span{background:#fff;border:1px solid #a7b7d5;border-radius:6px;padding:8px 11px;font:750 .87rem ui-monospace,monospace}.calc-step-card{padding:28px}.calc-step-head{border-bottom:1px solid #c9d4e6;padding-bottom:20px}.calc-step-head span{color:var(--blue);letter-spacing:.06em;text-transform:uppercase;margin-bottom:7px;font:850 .74rem ui-monospace,monospace;display:block}.calc-step-head strong{font-size:clamp(1.25rem,2vw,1.65rem);line-height:1.35;display:block}.scratch-field{text-transform:uppercase;gap:8px;margin-top:22px;font:850 .76rem ui-monospace,monospace;display:grid}.scratch-field textarea{text-transform:none;background-image:linear-gradient(#0000 31px,#0758ff1c 32px);background-size:100% 32px;min-height:105px;font:600 1rem/1.6 ui-monospace,monospace}.result-form{grid-template-columns:1fr 180px auto;align-items:end;gap:12px;margin-top:19px;display:grid}.result-form>label{text-transform:uppercase;gap:7px;font:850 .75rem ui-monospace,monospace;display:grid}.result-form>label>div{background:#fff;border:1.5px solid #6d83ad;border-radius:7px;align-items:center;min-height:50px;display:flex;overflow:hidden}.result-form>label>div span{color:var(--blue);white-space:nowrap;padding-left:13px;font:900 1.05rem ui-monospace,monospace}.result-form input,.result-form select{width:100%;min-height:50px;color:var(--ink);background:#fff;border:1.5px solid #6d83ad;border-radius:7px;padding:0 13px}.result-form>label>div input{border:0;outline:0}.result-form button{border:1.5px solid var(--blue);background:var(--blue);color:#fff;cursor:pointer;border-radius:7px;min-height:50px;padding:0 20px;font-weight:900}.calc-feedback{border:1.5px solid;border-radius:8px;justify-content:space-between;align-items:center;gap:20px;margin-top:18px;padding:17px 18px;display:flex}.calc-feedback span{letter-spacing:.06em;text-transform:uppercase;font:900 .73rem ui-monospace,monospace}.calc-feedback p{margin:5px 0 0;line-height:1.52}.calc-feedback-correct{border-color:var(--green);background:#effaf2}.calc-feedback-wrong,.calc-feedback-empty{border-color:var(--red);background:#fff1ef}.calc-feedback-unit{background:#fff9e9;border-color:#d39400}.calc-feedback button{background:var(--green);color:#fff;cursor:pointer;white-space:nowrap;border:0;border-radius:6px;padding:11px 15px;font-weight:850}.calc-help{border-top:1px dashed #9fb1d2;margin-top:25px;padding-top:22px}.calc-help-buttons{flex-wrap:wrap;gap:8px;display:flex}.calc-help-buttons button{border:1.3px solid var(--blue);color:var(--blue);cursor:pointer;background:#fff;border-radius:999px;padding:8px 12px;font-size:.78rem;font-weight:800}.calc-help-buttons button.help-open{background:var(--blue-soft)}.calc-help-content{gap:10px;margin-top:15px;display:grid}.calc-help-content>div{border-left:4px solid var(--lime);background:#f2fcdc;padding:14px 16px}.calc-help-content span{color:var(--blue);letter-spacing:.06em;text-transform:uppercase;font:900 .68rem ui-monospace,monospace;display:block}.calc-help-content p{margin:5px 0 0;line-height:1.5}.calc-help-content strong{margin-top:7px;font:800 1.02rem ui-monospace,monospace;display:block}.calc-help-content .calc-full-solution{border-left-color:var(--blue);background:var(--blue-soft)}.calc-sidebar{padding:20px;position:sticky;top:116px}.calc-sidebar-title{border-bottom:1px solid #c9d4e6;justify-content:space-between;gap:12px;padding:3px 2px 15px;display:flex}.calc-sidebar-title span{font-weight:900}.calc-sidebar-title small{color:var(--muted);text-align:right}.calc-exercise-list{max-height:520px;padding:9px 0;overflow:auto}.calc-exercise-list>button{text-align:left;cursor:pointer;background:0 0;border:0;border-radius:7px;grid-template-columns:34px 1fr 20px;align-items:center;gap:8px;width:100%;padding:11px 8px;display:grid}.calc-exercise-list>button:hover,.calc-exercise-list>button.calc-active{background:var(--blue-soft)}.calc-exercise-list>button>span{color:var(--blue);font:800 .75rem ui-monospace,monospace}.calc-exercise-list strong,.calc-exercise-list small{display:block}.calc-exercise-list strong{font-size:.82rem;line-height:1.3}.calc-exercise-list small{color:var(--muted);margin-top:2px;font-size:.7rem}.calc-exercise-list b{color:var(--green)}.calc-ai{border:1.5px solid var(--ink);background:var(--lime);width:100%;box-shadow:3px 3px 0 var(--ink);cursor:pointer;border-radius:7px;margin-top:12px;padding:12px;font-weight:900}.calc-ai span{color:var(--blue)}.formula-page{width:min(1380px,94vw);margin:0 auto;padding:58px 0 90px}.formula-intro{grid-template-columns:1fr 190px;align-items:end;gap:42px;display:grid}.formula-intro h1{margin-bottom:16px}.formula-intro p{max-width:820px;color:var(--muted);margin:0;font-size:1.08rem;line-height:1.65}.formula-count{border:1.5px solid var(--blue);background:var(--paper-strong);box-shadow:4px 4px 0 var(--blue);border-radius:9px;padding:18px 20px}.formula-count span,.formula-count small{display:block}.formula-count span{color:var(--blue);text-transform:uppercase;font:850 .72rem ui-monospace,monospace}.formula-count strong{margin:5px 0;font:900 2rem ui-monospace,monospace;display:block}.formula-count small{color:var(--muted);line-height:1.4}.formula-workspace{grid-template-columns:minmax(0,1.4fr) minmax(300px,.6fr);align-items:start;gap:25px;margin-top:38px;display:grid}.formula-editor,.template-panel{border:1.7px solid var(--line);background:#fffdf7f5;border-radius:10px}.formula-editor{padding:27px;box-shadow:6px 6px #0758ff30}.formula-editor-head,.template-panel>div:first-child{justify-content:space-between;align-items:center;gap:18px;display:flex}.formula-editor-head>div,.template-panel>div:first-child{justify-content:flex-start}.formula-editor-head>div{align-items:center;gap:12px;display:flex}.formula-editor-head span,.template-panel>div:first-child span{color:var(--blue);font:900 .82rem ui-monospace,monospace}.formula-editor-head h2,.template-panel h2{margin:0;font-size:1.35rem}.formula-editor-head>button{border:1.3px solid var(--blue);background:var(--blue-soft);color:var(--blue);cursor:pointer;border-radius:999px;padding:8px 12px;font-size:.8rem;font-weight:850}.formula-field-row{grid-template-columns:repeat(2,1fr);gap:13px;margin-top:23px;display:grid}.formula-field-row label,.formula-main-input,.formula-note-input{text-transform:uppercase;gap:7px;font:850 .74rem ui-monospace,monospace;display:grid}.formula-field-row label span,.formula-note-input span{color:var(--muted);text-transform:none;font-weight:650}.formula-field-row input,.formula-field-row select,.formula-note-input input{width:100%;min-height:46px;color:var(--ink);text-transform:none;background:#fff;border:1.3px solid #6d83ad;border-radius:6px;padding:10px 12px}.formula-main-input{margin-top:15px}.formula-main-input textarea{letter-spacing:.02em;text-transform:none;min-height:90px;font:600 1.25rem/1.45 Caveat,Segoe Print,Comic Sans MS,cursive}.symbol-palette{gap:12px;margin-top:16px;display:grid}.symbol-group{grid-template-columns:130px 1fr;align-items:start;gap:12px;display:grid}.symbol-group>strong{color:var(--muted);text-transform:uppercase;padding-top:7px;font:850 .68rem ui-monospace,monospace}.symbol-group>div{flex-wrap:wrap;gap:6px;display:flex}.symbol-group button{cursor:pointer;background:#fff;border:1.2px solid #6e8ac1;border-radius:6px;min-width:39px;min-height:36px;padding:5px 9px;font:650 1rem Caveat,Segoe Print,cursive}.symbol-group button:hover{border-color:var(--blue);background:var(--blue-soft);transform:translateY(-1px)}.shortcut-note{border-left:4px solid var(--lime);color:#35415a;background:#f2fcdc;margin-top:16px;padding:12px 14px;font-size:.82rem;line-height:1.55}.shortcut-note code{color:var(--blue);background:#fff;border-radius:4px;padding:1px 4px}.formula-note-input{margin-top:15px}.formula-live-preview{background:#fffef9;border:1px dashed #8fa5cf;border-radius:7px;margin-top:15px;padding:14px 16px}.formula-live-preview span{color:var(--muted);text-transform:uppercase;font:800 .66rem ui-monospace,monospace;display:block}.formula-live-preview strong{margin-top:4px;font:600 1.55rem Caveat,Segoe Print,Comic Sans MS,cursive;display:block}.formula-add{border:1.5px solid var(--blue);background:var(--blue);color:#fff;cursor:pointer;border-radius:7px;width:100%;min-height:49px;margin-top:16px;font-weight:900}.formula-add:disabled{cursor:not-allowed;background:#aab5c9;border-color:#aab5c9}.template-panel{padding:22px;position:sticky;top:112px}.template-panel>div:first-child{gap:10px;display:flex}.template-panel>p{color:var(--muted);margin:13px 0 16px;font-size:.86rem;line-height:1.5}.template-list{gap:7px;max-height:650px;padding-right:4px;display:grid;overflow:auto}.template-list button{text-align:left;cursor:pointer;background:#fff;border:1px solid #b4c2dc;border-radius:7px;padding:11px 12px}.template-list button:hover{border-color:var(--blue);background:var(--blue-soft)}.template-list span,.template-list strong,.template-list small{display:block}.template-list span{color:var(--blue);text-transform:uppercase;font:800 .62rem ui-monospace,monospace}.template-list strong{margin:5px 0 2px;font:600 1.05rem Caveat,Segoe Print,cursive}.template-list small{color:var(--muted)}.formula-output{margin-top:46px}.formula-output-head{justify-content:space-between;align-items:end;gap:28px;margin-bottom:18px;display:flex}.formula-output-head h2{margin:8px 0 0;font-size:1.45rem}.formula-capacity{color:var(--muted);align-items:center;gap:10px;margin-top:10px;font-size:.78rem;display:flex}.formula-capacity strong{border:1px solid var(--blue);color:var(--blue);border-radius:999px;padding:5px 9px;font:850 .7rem ui-monospace,monospace}.formula-capacity-over{color:var(--red)}.formula-capacity-over strong{border-color:var(--red);color:var(--red)}.formula-output-head>div:last-child{gap:9px;display:flex}.formula-output-head button,.formula-pdf-link{cursor:pointer;border-radius:7px;min-height:43px;padding:0 15px;font-weight:850}.formula-clear{border:1.3px solid var(--red);color:var(--red);background:#fff}.formula-download{border:1.3px solid var(--blue);background:var(--blue);color:#fff}.formula-download:disabled{opacity:.55;cursor:not-allowed}.formula-pdf-link{border:1.3px solid var(--ink);background:var(--lime);color:var(--ink);box-shadow:3px 3px 0 var(--ink);justify-content:center;align-items:center;text-decoration:none;display:inline-flex}.formula-export-error{border-left:4px solid var(--red);color:var(--red);background:#fff1ef;margin:-8px 0 14px;padding:11px 13px;font-weight:750}.formula-paper-scroll{background:#dfe5ef;border:1.5px solid #9eb0d1;border-radius:10px;padding:16px;overflow:auto}.formula-paper-stack{gap:12mm;width:210mm;margin:0 auto;font-family:Caveat,Segoe Print,Comic Sans MS,cursive;display:grid}.formula-paper{color:#111827;background-color:#fffef9;background-image:linear-gradient(#205bb60e .25mm,#0000 .25mm),linear-gradient(90deg,#205bb60e .25mm,#0000 .25mm);background-size:4mm 4mm;grid-template-rows:auto minmax(0,1fr) auto;width:210mm;height:297mm;padding:3.5mm 4.5mm 3mm;display:grid;overflow:hidden;box-shadow:0 5px 18px #071d4a2e}.formula-paper>header{justify-content:space-between;align-items:center;gap:4mm;min-height:4.2mm;padding:0 1mm .25mm;display:flex}.formula-paper>header strong{color:#111827;letter-spacing:.04em;font:850 7px ui-monospace,monospace}.formula-paper>header span{color:#364152;font:600 7.2px Caveat,cursive}.formula-page-columns{grid-template-columns:repeat(3,minmax(0,1fr));gap:2.2mm;min-height:0;padding-top:1.5mm;display:grid}.formula-column{border-right:.2mm solid #1118272e;min-width:0;padding-right:2.2mm}.formula-column:last-child{border-right:0;padding-right:0}.formula-paper-group{margin:0 0 1.45mm;padding:0}.formula-paper-group h3{color:#263852;letter-spacing:-.015em;background:linear-gradient(#0000 48%,#ffdc486b 48% 88%,#0000 88%);border:0;width:fit-content;max-width:100%;margin:0 0 .65mm;padding:.15mm .65mm .2mm;font-size:8.4px;font-weight:600;line-height:1}.formula-paper-group article{border-bottom:.18mm solid #11182724;margin:0 0 .6mm;padding:0 3.3mm .45mm .7mm;position:relative}.formula-paper-group article:nth-of-type(2n) strong{transform:rotate(-.08deg)}.formula-paper-group article:nth-of-type(3n) strong{transform:rotate(.08deg)}.formula-paper-group article button{color:#c5323a;cursor:pointer;background:#fff0ef;border:0;border-radius:50%;width:3mm;height:3mm;padding:0;font:700 8px/1 Arial,sans-serif;position:absolute;top:-.2mm;right:0}.formula-paper-group article span,.formula-paper-group article strong,.formula-paper-group article small{display:block}.formula-paper-group article span{color:#4b5563;letter-spacing:-.015em;font-size:6.1px;line-height:1}.formula-paper-group article strong{color:#090c12;letter-spacing:-.045em;overflow-wrap:anywhere;white-space:pre-wrap;transform-origin:0;margin:.12mm 0;font-size:9.2px;font-weight:500;line-height:1.02}.formula-paper-group article small{color:#343b47;letter-spacing:-.025em;font-size:6.2px;font-weight:500;line-height:1.02}.formula-paper>footer{color:#596273;text-align:right;letter-spacing:-.02em;border-top:.2mm solid #11182740;margin:1mm 0 0;padding:.7mm .5mm 0;font:500 5.5px Caveat,cursive}.formula-empty{color:#7d8ba5;place-items:center;font-size:16px;display:grid}.formula-density-tight .formula-paper-group{margin-bottom:1.05mm}.formula-density-tight .formula-paper-group h3{margin-bottom:.45mm;font-size:7.8px}.formula-density-tight .formula-paper-group article{margin-bottom:.42mm;padding-bottom:.3mm}.formula-density-tight .formula-paper-group article strong{font-size:8.4px}.formula-density-tight .formula-paper-group article span,.formula-density-tight .formula-paper-group article small{font-size:5.8px}.formula-density-ultra .formula-paper-group{margin-bottom:.75mm}.formula-density-ultra .formula-paper-group h3{margin-bottom:.35mm;padding-top:.3mm;font-size:7.2px}.formula-density-ultra .formula-paper-group article{margin-bottom:.25mm;padding-bottom:.2mm}.formula-density-ultra .formula-paper-group article strong{font-size:7.6px;line-height:.98}.formula-density-ultra .formula-paper-group article span,.formula-density-ultra .formula-paper-group article small{font-size:5.3px;line-height:.98}.formula-exporting{gap:0}.formula-exporting .formula-paper{box-shadow:none}.formula-exporting .formula-paper-group article button{display:none}.formula-exporting .formula-paper-group article{padding-right:.7mm}@media (max-width:1000px){.topbar{grid-template-columns:1fr auto}nav{border-top:1px solid #0758ff1f;grid-area:2/1/auto/-1;justify-content:center;padding:7px 0}.training-layout{grid-template-columns:1fr}.training-side{grid-row:1}.learning-hint-side{grid-row:2}.session-card{grid-row:1;grid-template-columns:1fr 1fr;gap:16px 28px;display:grid;position:static}.session-divider{display:none}.session-card .hint-button,.session-card .skip-button,.hint-text,.session-card .ai-question-button{grid-column:1/-1}.type-grid,.visual-grid,.quiz-layout{grid-template-columns:1fr}.quiz-side{grid-row:1;position:static}.progress-panel{grid-template-columns:1fr}.training-mode-switch{flex-direction:column;align-items:flex-start;margin-bottom:-6px}.calculation-layout{grid-template-columns:1fr}.calc-sidebar{grid-row:1;position:static}.calc-exercise-list{grid-template-columns:repeat(2,1fr);max-height:none;display:grid}.formula-workspace{grid-template-columns:1fr}.template-panel{position:static}.template-list{grid-template-columns:repeat(2,1fr);max-height:440px}}@media (max-width:680px){.topbar{gap:12px;padding:14px 4vw 0}.brand{font-size:1.25rem}.exam-chip{padding:9px 10px;font-size:.72rem}nav{justify-content:flex-start;overflow-x:auto}nav button{padding:9px 12px;font-size:.86rem}.training-layout{width:92vw;padding-top:28px}h1{font-size:2.25rem}.problem-card{box-shadow:4px 4px 0 var(--blue);padding:15px}.problem-meta{flex-direction:column;align-items:flex-start;gap:4px}.problem-meta strong{text-align:left}.problem-card>svg{min-height:145px}.concept-graphic{padding:11px}.concept-head{flex-direction:column;align-items:flex-start;gap:3px}.concept-head strong{text-align:left}.concept-graphic svg{min-height:170px}.learning-hint{padding:15px;box-shadow:3px 3px #0758ff33}.answer{grid-template-columns:40px 1fr;gap:13px;padding:10px 13px;font-size:.92rem}.answer-number{width:36px;height:36px}.feedback{flex-direction:column;align-items:stretch}.session-card{grid-template-columns:1fr;padding:20px}.session-card .hint-button,.session-card .skip-button,.hint-text,.session-card .ai-question-button{grid-column:auto}.type-card{grid-template-columns:38px 1fr}.type-card button{grid-column:2;justify-self:start}.quiz-page{width:92vw;padding-top:30px}.quiz-topline{flex-direction:column;gap:8px}.quiz-counter{width:100%}.quiz-statement{padding:15px}.truth-buttons{padding-left:0}.truth-buttons button{flex:1;min-width:0}.quiz-explanation{margin-left:0}.quiz-actions,.quiz-check{width:100%}.professor-section{grid-template-columns:1fr;padding:22px}.stats-grid{grid-template-columns:1fr}.ai-backdrop{padding:10px}.ai-dialog{box-shadow:5px 5px 0 var(--blue);padding:25px 18px}.ai-actions{flex-direction:column;align-items:stretch}.ai-actions button{width:100%}footer{flex-direction:column}.training-mode-switch{width:92vw}.training-mode-switch>div{width:100%}.training-mode-switch button{flex:1;min-width:0;padding:9px 10px}.training-mode-switch button small{display:none}.calculation-page,.formula-page{width:92vw;padding-top:36px}.calculation-heading,.formula-intro{grid-template-columns:1fr;gap:18px}.calculation-score,.formula-count{width:100%}.calc-step-card,.formula-editor{padding:18px}.result-form{grid-template-columns:1fr 1fr}.result-form>button{grid-column:1/-1}.calc-feedback{flex-direction:column;align-items:stretch}.calc-exercise-list,.formula-field-row{grid-template-columns:1fr}.symbol-group{grid-template-columns:1fr;gap:5px}.symbol-group>strong{padding-top:0}.template-list{grid-template-columns:1fr}.formula-output-head{flex-direction:column;align-items:stretch}.formula-output-head>div:last-child{flex-direction:column}.formula-output-head button{width:100%}}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition:none!important}}