:root{--geo:#155d9c;--geo-dark:#103f70;--geo-soft:#e8f3fb;--geo-green:#11786d;--geo-orange:#e79025;--geo-line:#cadde8}
.geometry-page{background:#f8fbfd}.geometry-page [hidden]{display:none!important}.geometry-hero{overflow:hidden;border-bottom:1px solid var(--geo-line);background:radial-gradient(circle at 84% 18%,rgba(231,144,37,.2),transparent 27%),linear-gradient(135deg,#e9f5fb,#fafcfd 56%,#fff8ec)}.geometry-hero-grid{display:grid;grid-template-columns:minmax(0,1.06fr) minmax(350px,.94fr);gap:clamp(36px,7vw,88px);align-items:center}.grade-line{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:20px}.grade-line span{padding:6px 11px;border:1px solid #bed6e3;border-radius:999px;background:rgba(255,255,255,.8);color:var(--geo-dark);font-size:.78rem;font-weight:900;letter-spacing:.06em;text-transform:uppercase}.grade-line span:first-child{border-color:var(--geo);background:var(--geo);color:#fff}.geometry-hero h1{max-width:760px;margin:0;font-size:clamp(2.5rem,5.8vw,5rem);letter-spacing:-.045em}.geometry-hero p{max-width:710px;color:var(--muted);font-size:clamp(1.04rem,2vw,1.23rem)}.hero-board{overflow:hidden;border:1px solid #b9cfd8;border-radius:26px;background:rgba(255,255,255,.95);box-shadow:0 24px 60px rgba(19,75,111,.15);transform:rotate(1deg)}.hero-board svg{display:block;width:100%}.board-label{display:flex;justify-content:space-between;gap:15px;padding:13px 20px;border-top:1px solid #d9e7ed;background:#fff}.board-label span{color:var(--geo-green);font-size:.72rem;font-weight:900;letter-spacing:.08em}.board-label strong{color:var(--geo-dark);font-size:.83rem}
.geometry-heading{max-width:800px}.lab-section{background:#fff}.lab-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}.lab-grid article{padding:22px;border:1px solid var(--line);border-radius:19px;background:#fff;box-shadow:0 10px 28px rgba(16,42,67,.06)}.lab-icon{display:grid;width:49px;height:49px;margin-bottom:15px;place-items:center;border-radius:14px;background:var(--geo-soft);color:var(--geo-dark);font-family:"Cambria Math",Cambria,serif;font-size:1.6rem;font-weight:900}.lab-grid article>span{color:var(--geo-green);font-size:.75rem;font-weight:900;letter-spacing:.07em;text-transform:uppercase}.lab-grid h3{margin:5px 0 9px}.lab-grid p{color:var(--muted);font-size:.93rem}.tool-tags{display:flex;gap:6px;flex-wrap:wrap;margin-top:15px}.tool-tags b{padding:4px 8px;border-radius:7px;background:#f0f5f8;color:var(--geo-dark);font-size:.72rem}
.training-section{position:relative;border-block:1px solid var(--geo-line);background:#edf5f9}.training-layout{display:grid;grid-template-columns:280px minmax(0,1fr);gap:22px;align-items:start}.training-sidebar{display:grid;gap:14px}.builder-card,.level-picker,.session-card,.formula-card{padding:18px;border:1px solid var(--geo-line);border-radius:17px;background:#fff}.builder-card{display:grid;grid-template-columns:48px 1fr;gap:11px 13px;align-items:center}.builder-avatar{display:grid;grid-row:span 2;width:48px;height:48px;place-items:center;border-radius:15px;background:linear-gradient(135deg,var(--geo),#4d9ac0);color:#fff;font-size:1.5rem;font-weight:900;box-shadow:0 8px 18px rgba(21,93,156,.22)}.sidebar-label{display:block;margin-bottom:10px;color:var(--muted);font-size:.75rem;font-weight:900;letter-spacing:.07em;text-transform:uppercase}.builder-card .sidebar-label{margin:0}.builder-card strong{color:var(--geo-dark)}.builder-card small{grid-column:1/-1;color:var(--muted);font-size:.76rem}.xp-line{grid-column:1/-1;height:7px;overflow:hidden;border-radius:999px;background:#e5edf2}.xp-line span{display:block;width:0;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--geo-orange),#ffd06c);transition:width .35s ease}.segmented-control{display:grid;grid-template-columns:repeat(3,1fr);gap:4px;padding:4px;border-radius:11px;background:#edf2f5}.segmented-control button{padding:8px 4px;border:0;border-radius:8px;background:transparent;color:var(--muted);font-size:.86rem;font-weight:850;cursor:pointer}.segmented-control button.is-active{background:#fff;color:var(--geo-dark);box-shadow:0 2px 7px rgba(16,42,67,.12)}.session-head{display:flex;justify-content:space-between;gap:12px;font-weight:850}.progress-track{height:9px;margin:13px 0 15px;overflow:hidden;border-radius:999px;background:#e5edf2}.progress-track span{display:block;width:0;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--geo),#59a4c8);transition:width .3s ease}.game-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:5px;text-align:center}.game-stats div{display:grid;grid-template-columns:auto auto;justify-content:center;gap:3px;padding:7px 3px;border-radius:9px;background:#f3f7f9;color:var(--geo-dark)}.game-stats small{grid-column:1/-1;color:var(--muted);font-size:.66rem}.hearts{grid-column:1/-1;color:#df4c59;font-size:.82rem;white-space:nowrap}.formula-card{border-color:#e9cf9e;background:#fff9ed}.formula-card>strong{color:#75490a}.formula-card p{margin:8px 0 0;color:#66553d;font-size:.83rem;line-height:1.45}
.challenge-card{min-height:710px;padding:clamp(22px,4vw,38px);border:1px solid #c3d9e5;border-radius:23px;background:#fff;box-shadow:0 18px 45px rgba(16,69,109,.09)}.challenge-topline{display:flex;justify-content:space-between;align-items:center;gap:12px;color:var(--muted);font-size:.82rem;font-weight:900;letter-spacing:.06em;text-transform:uppercase}.topic-badge{padding:5px 11px;border-radius:999px;background:var(--geo-soft);color:var(--geo-dark)}.challenge-icon{display:grid;width:54px;height:54px;margin:28px auto 10px;place-items:center;border-radius:16px;background:var(--geo-soft);color:var(--geo-dark);font-family:"Cambria Math",Cambria,serif;font-size:1.7rem;font-weight:900}.challenge-card>h3{margin:0;text-align:center;font-size:clamp(1.55rem,3vw,2.15rem)}.challenge-question{max-width:720px;margin:10px auto 0;color:var(--muted);font-weight:700;text-align:center}.task-visual{max-width:680px;margin:20px auto 0}.task-visual svg{display:block;width:100%;max-height:230px}.figure-sketch{display:grid;grid-template-columns:auto 1fr;gap:18px;align-items:center;max-width:540px;margin-inline:auto;padding:18px;border-radius:16px;background:#f4f9fb}.figure-shape{display:grid;place-items:center;border:4px solid var(--geo);background:rgba(21,93,156,.07);color:var(--geo-dark);font-weight:900}.figure-facts{display:grid;gap:6px;color:var(--geo-dark)}.choice-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;max-width:700px;margin:25px auto 0}.choice-button{min-height:59px;padding:11px;border:2px solid #cfdee6;border-radius:12px;background:#fff;color:var(--ink);font-weight:850;cursor:pointer}.choice-button:hover{border-color:var(--geo);background:#f7fbfd}.choice-button.is-correct{border-color:#389580;background:#e9f7f3;color:#075e51}.choice-button.is-wrong{border-color:#d66c64;background:#fff0ef;color:#99261d}.number-entry{max-width:610px;margin:25px auto 0}.number-entry>label{display:block;margin-bottom:7px;color:var(--muted);font-size:.78rem;font-weight:900;letter-spacing:.06em;text-transform:uppercase}.number-row{display:grid;grid-template-columns:minmax(0,1fr) auto auto;gap:8px}.number-row input{min-width:0;width:100%;padding:13px 15px;border:2px solid #b8ceda;border-radius:12px;color:var(--ink);font-size:1.2rem;font-weight:850}.number-row input:focus{border-color:var(--geo);outline:3px solid rgba(21,93,156,.14)}.number-row input.is-wrong{border-color:#d45d54;animation:shake .24s ease}.number-row span{display:grid;min-width:65px;place-items:center;border-radius:10px;background:var(--geo-soft);color:var(--geo-dark);font-family:"Cambria Math",Cambria,serif;font-weight:900}.keyboard-hint{margin:7px 2px 0;color:var(--muted);font-size:.79rem}.number-pad{display:none}
.drawing-entry,.angle-entry,.solid-entry{max-width:720px;margin:24px auto 0;text-align:center}.drawing-board,.angle-board,.solid-board{overflow:hidden;border:1px solid #bcd2dd;border-radius:16px;background:#fbfdfe;touch-action:none}.drawing-board svg,.angle-board svg,.solid-board svg{display:block;width:100%;min-height:300px;touch-action:none}.geo-grid-line{stroke:#dce8ed;stroke-width:1}.geo-grid-major{stroke:#bfd2db;stroke-width:1.5}.geo-base{stroke:#526f80;stroke-width:5;stroke-linecap:round}.geo-user{stroke:var(--geo);stroke-width:6;stroke-linecap:round}.geo-point{fill:#fff;stroke:var(--geo-orange);stroke-width:4}.geo-point-label{fill:#7c4a08;font-size:20px;font-weight:900}.geo-selection{fill:var(--geo-orange);opacity:.26}.drawing-status{margin:10px 0 0;color:var(--muted);font-weight:750}.drawing-buttons{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;margin-top:13px}.angle-entry label{display:block;margin:13px 0 5px;color:var(--geo-dark);font-weight:800}.angle-entry input[type=range]{width:min(100%,520px);accent-color:var(--geo);touch-action:pan-x}.angle-entry>.button{display:block;margin:16px auto 0}.solid-node{fill:#fff;stroke:var(--geo-orange);stroke-width:4;cursor:pointer}.solid-node.is-selected{fill:#ffd28f}.solid-existing{stroke:#526f80;stroke-width:5;fill:none}.solid-user{stroke:var(--geo);stroke-width:5;fill:none}.solid-label{fill:#704709;font-size:17px;font-weight:900}
.feedback-box,.solution-box{margin-top:18px;padding:14px 16px;border-radius:12px;font-weight:760}.feedback-box.success{background:#e8f7f3;color:#075e51}.feedback-box.error{background:#fff0ef;color:#9c251c}.feedback-box.hint{background:#fff5e7;color:#704100}.solution-box{border-left:4px solid var(--geo);background:#edf6fb;color:var(--ink);white-space:pre-line}.challenge-actions{display:flex;justify-content:space-between;gap:10px;align-items:center;flex-wrap:wrap;margin-top:22px}.hint-button{padding:9px 12px;border:0;background:transparent;color:var(--geo-dark);font-weight:900;cursor:pointer}.reward-pop{position:fixed;z-index:40;top:45%;left:50%;padding:11px 18px;border-radius:999px;background:#103f70;color:#fff;font-weight:900;pointer-events:none;transform:translate(-50%,-50%);animation:reward .8s ease both}.confetti-layer{position:fixed;z-index:35;inset:0;overflow:hidden;pointer-events:none}.confetti-piece{position:absolute;top:-20px;width:9px;height:16px;border-radius:3px;animation:fall 1.2s ease-in forwards}
.method-section{background:#fff}.method-card{padding:clamp(24px,5vw,48px);border:1px solid #c3d9e5;border-radius:25px;background:linear-gradient(135deg,#f8fcfd,#eaf4f9)}.method-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:13px;margin-top:28px}.method-steps div{position:relative;padding:20px 14px 20px 62px;border-radius:15px;background:#fff}.method-steps span{position:absolute;top:17px;left:15px;display:grid;width:36px;height:36px;place-items:center;border-radius:50%;background:var(--geo);color:#fff;font-weight:900}.method-steps strong,.method-steps small{display:block}.method-steps small{margin-top:4px;color:var(--muted);line-height:1.4}
@keyframes shake{25%{transform:translateX(-4px)}75%{transform:translateX(4px)}}@keyframes reward{0%{opacity:0;transform:translate(-50%,-20%) scale(.75)}25%{opacity:1;transform:translate(-50%,-50%) scale(1.08)}100%{opacity:0;transform:translate(-50%,-85%)}}@keyframes fall{to{transform:translateY(105vh) rotate(520deg);opacity:.2}}
@media(max-width:980px){.geometry-hero-grid,.training-layout{grid-template-columns:1fr}.hero-board{max-width:650px}.lab-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:680px){.lab-grid,.method-steps{grid-template-columns:1fr}.challenge-card{min-height:720px;padding-inline:15px}.choice-grid{grid-template-columns:1fr}.number-row{grid-template-columns:minmax(0,1fr) auto}.number-row .button,.keyboard-hint{display:none}.number-pad{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:7px;margin-top:11px;padding:10px;border-radius:15px;background:#19354a}.number-pad button{min-height:47px;border:0;border-radius:9px;background:#fff;color:#19354a;font-weight:900;box-shadow:0 2px 0 #adbec8}.number-pad .pad-back,.number-pad .pad-clear{background:#e6edf1}.number-pad .pad-clear{grid-column:span 2}.number-pad .pad-submit{grid-column:span 2;background:var(--geo);color:#fff;box-shadow:0 2px 0 var(--geo-dark)}.drawing-board svg,.angle-board svg,.solid-board svg{min-height:245px}.figure-sketch{grid-template-columns:1fr}.figure-shape{margin:auto}}
@media(prefers-reduced-motion:reduce){.reward-pop,.confetti-piece,.number-row input.is-wrong{animation:none}}