/* matematik.biz — Akıllı Tahta */
.mbt{--mbt-a:#1F6F5F;--mbt-aa:#E9F8F4;--mbt-c:#dfe5e8;position:relative;display:flex;flex-direction:column;height:calc(100vh - 90px);min-height:540px;background:#eef1f3;border:1px solid var(--mbt-c);border-radius:14px;overflow:hidden;font:500 14px/1.3 Poppins,"Segoe UI",Arial,sans-serif;color:#1f2d27;user-select:none;-webkit-user-select:none}
.mbt:fullscreen,.mbt.mbt-tam{height:100vh;border-radius:0;border:0}
.mbt.mbt-tam{position:fixed;inset:0;z-index:999999}
.mbt *{box-sizing:border-box}
.mbt button{font:inherit;cursor:pointer}
.mbt svg{display:block}
/* üst çubuk */
.mbt-ust{display:flex;align-items:center;gap:6px;padding:6px 8px;background:#fff;border-bottom:1px solid var(--mbt-c);flex-wrap:wrap}
.mbt-sec{height:40px;border:1px solid var(--mbt-c);border-radius:10px;padding:0 8px;background:#fff;font:600 14px Poppins,Arial,sans-serif;max-width:260px;color:#1f2d27}
.mbt-tema{max-width:190px}
.mbt-nav{display:flex;align-items:center;gap:2px;background:#f3f6f7;border-radius:12px;padding:2px}
.mbt-ub{width:40px;height:40px;border:0;border-radius:10px;background:transparent;display:flex;align-items:center;justify-content:center;color:#2b3a40}
.mbt-ub:hover{background:#e5ecee}
.mbt-ub svg,.mbt-d svg{width:24px;height:24px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.mbt-no{width:64px;height:36px;border:1px solid var(--mbt-c);border-radius:8px;text-align:center;font:700 15px Poppins,Arial,sans-serif;-moz-appearance:textfield}
.mbt-no::-webkit-inner-spin-button{display:none}
.mbt-top{color:#5f6d73;padding:0 6px 0 4px;white-space:nowrap}
.mbt-bas{color:var(--mbt-a);font-weight:700;white-space:nowrap;padding:0 4px}
.mbt-ay{flex:1}
.mbt-prof{height:40px;border:2px solid var(--mbt-a);color:var(--mbt-a);background:var(--mbt-aa);border-radius:999px;padding:0 14px;font-weight:700!important}
/* gövde */
.mbt-govde{flex:1;display:flex;min-height:0}
.mbt-dok{width:150px;flex:0 0 150px;background:#fff;border-right:1px solid var(--mbt-c);overflow-y:auto;overflow-x:hidden;padding:6px;display:grid;grid-template-columns:1fr 1fr;align-content:start;gap:3px;scrollbar-width:thin}
.mbt-d{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;border:0;background:transparent;border-radius:12px;padding:6px 2px 4px;color:#2b3a40;min-height:56px}
.mbt-d svg{flex:0 0 auto}.mbt-d span{font-size:11px;white-space:nowrap;line-height:1.1;text-align:center;font-weight:600;color:#55656b}
.mbt-d:hover{background:#f0f4f5}
.mbt-d.on{background:var(--mbt-a);color:#fff}.mbt-d.on span{color:#fff}
.mbt-d:disabled{opacity:.35;cursor:default}
.mbt-ayr{display:block;height:1px;background:var(--mbt-c);margin:3px 6px;grid-column:1/-1}
.mbt-pal{grid-column:1/-1;display:grid;grid-template-columns:repeat(4,1fr);gap:6px;padding:8px 2px 2px;border-top:1px solid var(--mbt-c);margin-top:4px}.mbt-pal .mbt-k:first-of-type{grid-column:1}
.mbt-r{width:30px;height:30px;border-radius:50%;border:2px solid #fff;box-shadow:0 0 0 1px #c9d2d6;justify-self:center}
.mbt-r.on{box-shadow:0 0 0 3px var(--mbt-a)}
.mbt-k{height:30px;border:1px solid var(--mbt-c);border-radius:8px;background:#fff;display:flex;align-items:center;justify-content:center}
.mbt-k i{display:block;border-radius:50%}
.mbt-k.on{border:2px solid var(--mbt-a);background:var(--mbt-aa)}
/* sahne */
.mbt-sahne{position:relative;flex:1;overflow:hidden;touch-action:none;background:#e4e8eb;cursor:crosshair}
.mbt-sahne[data-arac=gez]{cursor:grab}.mbt-sahne[data-arac=silgi]{cursor:cell}.mbt-sahne[data-arac=yazi]{cursor:text}
.mbt-kagit{position:absolute;left:0;top:0;transform-origin:0 0;background:#fff;box-shadow:0 2px 18px rgba(0,0,0,.18)}
.mbt-img{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}
.mbt-zem,.mbt-svg{position:absolute;inset:0;pointer-events:none;overflow:visible}
.mbt-secr{fill:rgba(255,213,79,.18);stroke:#f9a825;stroke-width:4;stroke-dasharray:14 8}
.mbt-olcu{fill:#c62828;font-weight:700;font-family:Poppins,Arial,sans-serif;paint-order:stroke;stroke:#fff;stroke-width:5px}
.mbt-coz{position:absolute;overflow:hidden;border:3px solid #f9a825;border-radius:10px;background:#fff}
.mbt-coz img{position:absolute;max-width:none;pointer-events:none}
.mbt-yuk{position:absolute;left:50%;top:14px;transform:translateX(-50%);background:#fff;padding:6px 14px;border-radius:999px;box-shadow:0 2px 10px rgba(0,0,0,.15);display:none;color:#55656b}
.mbt-yuk.on{display:block}
.mbt-ipucu{position:absolute;left:50%;bottom:16px;transform:translate(-50%,20px);background:#1f2d27;color:#fff;padding:9px 16px;border-radius:12px;opacity:0;transition:.25s;pointer-events:none;max-width:90%;text-align:center;z-index:30}
.mbt-ipucu.on{opacity:.94;transform:translate(-50%,0)}
.mbt-ekran{position:absolute;inset:0;pointer-events:none;z-index:10}
.mbt-ekran>*{pointer-events:auto}
.mbt-al-svg{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;overflow:visible}
.mbt-al{pointer-events:auto;cursor:move}
.mbt-al-g{fill:rgba(225,240,255,.55);stroke:#5b8db8;stroke-width:1.5}
.mbt-al-c{stroke:#2c4a63;stroke-width:1}
.mbt-al-t{font:600 11px Poppins,Arial,sans-serif;fill:#2c4a63;text-anchor:middle;pointer-events:none}
.mbt-al-ts{font-size:10px}.mbt-al-ts2{font-size:8.5px;fill:#8a3b3b}
.mbt-al-m{fill:#c62828}
.mbt-al-don{fill:#1F6F5F;stroke:#fff;stroke-width:2;cursor:grab}
.mbt-al-kap{fill:#fff;stroke:#9aa8ad;stroke-width:1.5;cursor:pointer}
.mbt-al-dt{font:700 17px Arial,sans-serif;fill:#fff;text-anchor:middle;pointer-events:none}
.mbt-al-kap+.mbt-al-dt{fill:#55656b}
.mbt-al-aci{font:800 18px Poppins,Arial,sans-serif;fill:#1F6F5F;text-anchor:middle;paint-order:stroke;stroke:#fff;stroke-width:4px}
.mbt-perde{position:absolute;left:0;right:0;top:0;background:repeating-linear-gradient(90deg,#3d4b52 0 22px,#46565e 22px 44px);box-shadow:0 6px 18px rgba(0,0,0,.35)}
.mbt-perde-t{position:absolute;left:0;right:0;bottom:0;height:46px;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;cursor:ns-resize;background:linear-gradient(transparent,rgba(0,0,0,.25));touch-action:none}
.mbt-perde-t:after{content:"";position:absolute;bottom:8px;width:70px;height:6px;border-radius:3px;background:rgba(255,255,255,.7)}
.mbt-perde-x,.mbt-spot-x{position:absolute;right:10px;top:10px;width:40px;height:40px;border-radius:50%;border:0;background:#fff;font-size:24px!important;line-height:1;color:#333}
.mbt-spot{position:absolute;inset:0;touch-action:none;cursor:move}
.mbt-spot-b{position:absolute;width:32px;height:32px;border-radius:50%;background:#fff;border:3px solid #1F6F5F;cursor:nwse-resize}
.mbt-spot-x{width:32px;height:32px;font-size:20px!important}
.mbt-ysz{position:absolute;z-index:20;min-width:220px;min-height:60px;background:rgba(255,255,255,.92);border:2px dashed #1F6F5F;border-radius:8px;padding:2px 6px;font-family:Poppins,Arial,sans-serif;font-weight:600;line-height:1.25;resize:both;outline:none}
.mbt-secim-m{position:absolute;z-index:25;background:#fff;border-radius:14px;box-shadow:0 8px 28px rgba(0,0,0,.22);padding:6px;display:flex;flex-direction:column;min-width:230px}
.mbt-secim-m button{border:0;background:transparent;text-align:left;padding:12px 14px;border-radius:10px;font-weight:600!important}
.mbt-secim-m button:hover{background:#f0f4f5}
.mbt-acilir{position:absolute;z-index:40;background:#fff;border-radius:14px;box-shadow:0 8px 28px rgba(0,0,0,.22);padding:6px;display:flex;flex-direction:column;min-width:180px}
.mbt-acilir button{border:0;background:transparent;text-align:left;padding:11px 14px;border-radius:10px;font-weight:600!important}
.mbt-acilir button:hover{background:#f0f4f5}
.mbt-kro{position:absolute;right:16px;top:16px;z-index:22;background:#1f2d27;color:#fff;border-radius:16px;padding:10px 12px;box-shadow:0 8px 24px rgba(0,0,0,.3);cursor:move;touch-action:none}
.mbt-kro-e{font:800 44px/1 Poppins,Arial,sans-serif;text-align:center;font-variant-numeric:tabular-nums;padding:2px 6px 8px}
.mbt-kro.bitti .mbt-kro-e{color:#ff8a80;animation:mbtyan .6s infinite alternate}
@keyframes mbtyan{to{opacity:.35}}
.mbt-kro-s{display:flex;gap:4px;flex-wrap:wrap;justify-content:center;max-width:240px}
.mbt-kro-s button{border:0;border-radius:8px;background:rgba(255,255,255,.14);color:#fff;padding:7px 9px;font-weight:700!important;min-width:40px}
/* pencere */
.mbt-modal{position:absolute;inset:0;z-index:60;background:rgba(15,22,26,.45);display:flex;align-items:center;justify-content:center;padding:16px}
.mbt-modal-k{background:#fff;border-radius:18px;width:min(460px,100%);max-height:100%;display:flex;flex-direction:column;box-shadow:0 18px 50px rgba(0,0,0,.3)}
.mbt-modal-k.mbt-genis{width:min(980px,100%);height:min(86%,900px)}
.mbt-modal-b{display:flex;align-items:center;justify-content:space-between;padding:14px 16px 8px;font-size:17px}
.mbt-modal-x{width:40px;height:40px;border:0;border-radius:50%;background:#f0f4f5;font-size:24px!important;line-height:1}
.mbt-modal-i{padding:4px 16px 16px;overflow:auto;user-select:text}
.mbt-modal-i p{margin:4px 0 12px;color:#4a5960;line-height:1.5}
.mbt-satir{display:flex;gap:8px;margin:8px 0}
.mbt-satir input,.mbt-modal-i input:not([type=range]){flex:1;height:44px;border:1px solid var(--mbt-c);border-radius:10px;padding:0 12px;font:600 16px Poppins,Arial,sans-serif;min-width:0}
.mbt-btn{height:44px;border:0;border-radius:10px;background:var(--mbt-a);color:#fff;padding:0 18px;font-weight:700!important;margin-top:6px}
.mbt-link{border:0;background:none;color:#5f6d73;text-decoration:underline;margin-top:10px;padding:6px 0}
.mbt-prof-l{display:flex;flex-wrap:wrap;gap:8px;margin:6px 0 10px}
.mbt-prof-l button{min-width:64px;height:44px;border:2px solid var(--mbt-c);border-radius:12px;background:#fff;font-weight:700!important;padding:0 12px}
.mbt-prof-l button:hover{border-color:var(--mbt-a);background:var(--mbt-aa)}
.mbt-olc-c{height:26px;background:repeating-linear-gradient(90deg,#1F6F5F 0 10%,#7cc8b5 10% 20%);border-radius:4px;margin:10px 0}
.mbt-modal-i input[type=range]{width:100%}
.mbt-olc-y{font-weight:700;color:#1F6F5F!important}
.mbt-kucuk{display:grid;grid-template-columns:repeat(auto-fill,minmax(118px,1fr));gap:10px}
.mbt-kucuk button{border:2px solid transparent;border-radius:10px;background:#f3f6f7;padding:4px;display:flex;flex-direction:column;align-items:center;gap:4px}
.mbt-kucuk button.on{border-color:var(--mbt-a);background:var(--mbt-aa)}
.mbt-kucuk img{width:100%;aspect-ratio:.71;object-fit:cover;background:#fff;border-radius:6px}
.mbt-kucuk span{font-size:12px;color:#55656b;font-weight:600}
.mbt-kucuk-b{grid-column:1/-1;font-weight:800;color:var(--mbt-a);padding:10px 0 2px;border-bottom:2px solid var(--mbt-aa);scroll-margin-top:6px}
/* telefon / dar ekran: araçlar altta */
@media (max-width:760px){
  .mbt{height:calc(100vh - 70px)}
  .mbt-govde{flex-direction:column-reverse}
  .mbt-dok{width:auto;flex:0 0 auto;display:flex;flex-direction:row;border-right:0;border-top:1px solid var(--mbt-c);overflow-x:auto;overflow-y:hidden;padding:4px}
  .mbt-d{min-width:62px;min-height:54px}
  .mbt-ayr{width:1px;height:auto;margin:6px 2px}
  .mbt-pal{display:flex;border-top:0;border-left:1px solid var(--mbt-c);margin:0;padding:4px 6px;align-items:center}
  .mbt-tema,.mbt-bas{display:none}
  .mbt-sec{max-width:46vw}
}
/* büyük dokunmatik tahta */
@media (min-width:1700px){.mbt-d{min-height:66px}.mbt-dok{width:176px;flex-basis:176px}.mbt-ub{width:48px;height:48px}.mbt-sec,.mbt-prof{height:48px;font-size:16px}}
/* 2.36: cevaplar, bu hafta, materyaller, soru büyüt, lazer */
.mbt-cvb,.mbt-bhb,.mbt-matb{display:inline-flex;align-items:center;gap:6px;height:40px;border:0;border-radius:12px;padding:0 12px;font-weight:700!important;text-decoration:none!important;white-space:nowrap}
.mbt-cvb svg,.mbt-bhb svg,.mbt-matb svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.mbt-cvb{background:#E8F5E9;color:#1b5e20}.mbt-cvb.on{background:#2e7d32;color:#fff}.mbt-cvb.bos{opacity:.55}
.mbt-cvb i{font-style:normal;background:#2e7d32;color:#fff;border-radius:999px;min-width:22px;height:22px;display:inline-flex;align-items:center;justify-content:center;font-size:12px}
.mbt-cvb.on i{background:#fff;color:#2e7d32}.mbt-cvb i:empty{display:none}
.mbt-bhb{background:#FFF4E5;color:#9A5216}.mbt-matb{background:#EDF4F8;color:#3B6A85!important}
.mbt-cvp{position:absolute;right:12px;top:12px;bottom:12px;width:min(440px,46%);z-index:24;background:#fff;border-radius:16px;box-shadow:0 10px 34px rgba(0,0,0,.25);display:flex;flex-direction:column;overflow:hidden}
.mbt-cvp-b{display:flex;align-items:center;justify-content:space-between;padding:10px 12px;background:#2e7d32;color:#fff;font-size:15px}
.mbt-cvp-x{width:36px;height:36px;border:0;border-radius:50%;background:rgba(255,255,255,.2);color:#fff;font-size:22px!important;line-height:1}
.mbt-cvp-i{overflow:auto;padding:10px;display:flex;flex-direction:column;gap:10px}
.mbt-cvp-not{margin:0;color:#55656b;font-size:13px}.mbt-cvp-yok{color:#55656b}
.mbt-cvp-k{position:relative;border:2px solid #c8e6c9;border-radius:12px;background:#fff;padding:6px;cursor:pointer;min-height:70px}
.mbt-cvp-k img{width:100%;display:block;filter:blur(9px);opacity:.55;transition:.25s}
.mbt-cvp-k span{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-weight:800;color:#1b5e20;font-size:16px}
.mbt-cvp-k.acik img{filter:none;opacity:1}.mbt-cvp-k.acik span{display:none}
.mbt-cvp-buyuk{width:100%;display:block}
.mbt-lazer{fill:none;stroke:#ff1744;stroke-linecap:round;stroke-linejoin:round;filter:drop-shadow(0 0 6px #ff1744);opacity:.95}
.mbt-lazer-son{transition:opacity 1.2s;opacity:0}
.mbt-odak-x{position:absolute;left:50%;transform:translateX(-50%);top:14px;z-index:26;height:46px;border:0;border-radius:999px;padding:0 18px;background:#FFD54F;color:#1f2d27;font-weight:800!important;box-shadow:0 4px 14px rgba(0,0,0,.25)}
.mbt-sahne[data-arac=buyut]{cursor:zoom-in}
@media (max-width:760px){.mbt-cvb span,.mbt-bhb span,.mbt-matb span{display:none}.mbt-cvp{width:auto;left:8px;right:8px;top:auto;height:60%}}
@media (max-width:1750px){.mbt-bhb span,.mbt-matb span{display:none}.mbt-bhb,.mbt-matb{padding:0 10px}}