.has-edu-calculator .lesson-page { padding-bottom: 96px; }
.calculator-is-open { overflow: hidden; }
.edu-calculator { --calculator-blue:#173b63; --calculator-teal:#0f9d91; --calculator-violet:#7557c9; --calculator-yellow:#f2b946; --calculator-red:#b93848; --calculator-border:#cddde6; }
.edu-calculator [hidden] { display:none!important; }
.edu-calculator__trigger { position:fixed; right:24px; bottom:max(24px,env(safe-area-inset-bottom)); z-index:70; display:inline-flex; min-height:58px; align-items:center; gap:.65rem; padding:.8rem 1.15rem; color:#fff; background:linear-gradient(135deg,var(--calculator-blue),var(--calculator-teal)); border:0; border-radius:999px; box-shadow:0 14px 34px rgba(23,59,99,.28); font:inherit; font-weight:850; cursor:pointer; transition:transform .16s,box-shadow .16s; }
.edu-calculator__trigger:hover,.edu-calculator__trigger:focus-visible { transform:translateY(-2px); box-shadow:0 18px 38px rgba(23,59,99,.34); }
.edu-calculator__trigger:focus-visible,.edu-calculator__panel button:focus-visible,.edu-calculator__history summary:focus-visible { outline:4px solid rgba(242,185,70,.72); outline-offset:3px; }
.edu-calculator__trigger>span:first-child { font-size:1.45rem; }
.edu-calculator__backdrop { position:fixed; inset:0; z-index:80; background:rgba(11,30,49,.5); backdrop-filter:blur(2px); }
.edu-calculator__panel { position:fixed; right:24px; bottom:16px; z-index:90; width:min(410px,calc(100vw - 32px)); max-height:calc(100dvh - 32px); padding:1.25rem; overflow:auto; color:var(--calculator-blue); background:#f8fbfc; border:1px solid var(--calculator-border); border-radius:24px; box-shadow:0 24px 70px rgba(11,30,49,.32); }
.edu-calculator__header { display:flex; align-items:flex-start; justify-content:space-between; gap:1rem; margin-bottom:.75rem; }
.edu-calculator__header p { margin:0 0 .15rem; color:var(--calculator-teal); font-size:.75rem; font-weight:900; letter-spacing:.08em; text-transform:uppercase; }
.edu-calculator__header h2 { margin:0; color:var(--calculator-blue); font-size:1.55rem; }
.edu-calculator__close { display:grid; flex:0 0 44px; width:44px; height:44px; place-items:center; color:var(--calculator-blue); background:#fff; border:1px solid var(--calculator-border); border-radius:50%; font-size:1.8rem; cursor:pointer; }
.edu-calculator__mode { margin:0 0 .9rem; color:#536a7f; font-size:.88rem; line-height:1.45; }
.edu-calculator__screen { display:block; padding:1rem; background:linear-gradient(145deg,#102d4d,#1b4e68); border-radius:17px; box-shadow:inset 0 0 0 1px rgba(255,255,255,.08); }
.edu-calculator__screen input { width:100%; padding:0; color:#fff; background:transparent; border:0; outline:0; font:inherit; font-size:clamp(1.35rem,5vw,2rem); font-weight:850; text-align:right; }
.edu-calculator__screen output { display:block; min-height:1.35rem; margin-top:.4rem; color:#c9eee9; font-size:.9rem; text-align:right; }
.edu-calculator__screen output.is-error { color:#ffd1d6; }
.edu-calculator__scientific,.edu-calculator__keys { display:grid; grid-template-columns:repeat(3,1fr); gap:.55rem; margin-top:.8rem; }
.edu-calculator__keys { grid-template-columns:repeat(4,1fr); }
.edu-calculator__scientific button,.edu-calculator__keys button { min-height:48px; padding:.55rem .35rem; color:var(--calculator-blue); background:#fff; border:1px solid var(--calculator-border); border-radius:11px; font:inherit; font-weight:800; cursor:pointer; transition:background .14s,border-color .14s,transform .14s; }
.edu-calculator__scientific button:hover,.edu-calculator__keys button:hover { background:#edf7f5; border-color:var(--calculator-teal); transform:translateY(-1px); }
.edu-calculator__scientific button { color:#573ba2; background:#f3efff; border-color:#ddd3f4; }
.edu-calculator__keys .is-control { color:#8b2f3b; background:#fff0f2; border-color:#f0c8ce; }
.edu-calculator__keys .is-operator { color:#fff; background:var(--calculator-violet); border-color:var(--calculator-violet); font-size:1.25rem; }
.edu-calculator__keys .is-equals { grid-column:1 / -1; color:#fff; background:linear-gradient(135deg,var(--calculator-teal),#087a72); border-color:transparent; }
.edu-calculator__history { margin-top:.9rem; padding:.8rem .9rem; background:#fff; border:1px solid var(--calculator-border); border-radius:12px; }
.edu-calculator__history summary { color:var(--calculator-blue); font-weight:800; cursor:pointer; }
.edu-calculator__history ol { display:grid; gap:.35rem; padding-left:1.4rem; margin:.65rem 0 0; color:#536a7f; font-size:.88rem; }
@media(max-width:600px){.has-edu-calculator .lesson-page{padding-bottom:105px}.edu-calculator__trigger{right:16px;bottom:max(16px,env(safe-area-inset-bottom));min-width:58px;justify-content:center;padding:.75rem}.edu-calculator__trigger>span:last-child{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.edu-calculator__panel{right:0;bottom:0;width:100%;max-height:88dvh;padding:1rem 1rem calc(1rem + env(safe-area-inset-bottom));border-radius:22px 22px 0 0}.edu-calculator__scientific button,.edu-calculator__keys button{min-height:46px}}
@media(prefers-reduced-motion:reduce){.edu-calculator__trigger,.edu-calculator__scientific button,.edu-calculator__keys button{transition:none}}

@media(max-height:1100px) and (min-width:601px){.edu-calculator__panel{padding:.8rem}.edu-calculator__header{margin-bottom:.35rem}.edu-calculator__header h2{font-size:1.3rem}.edu-calculator__mode{margin-bottom:.45rem;line-height:1.25}.edu-calculator__screen{padding:.65rem}.edu-calculator__scientific,.edu-calculator__keys{gap:.35rem;margin-top:.45rem}.edu-calculator__scientific button,.edu-calculator__keys button{min-height:38px;padding:.25rem}.edu-calculator__history{margin-top:.5rem;padding:.55rem .7rem}}

@media(max-width:600px){.edu-calculator__panel{max-height:96dvh;padding:.7rem}.edu-calculator__header{margin-bottom:.25rem}.edu-calculator__header h2{font-size:1.25rem}.edu-calculator__close{width:38px;height:38px;flex-basis:38px}.edu-calculator__mode{margin-bottom:.35rem;font-size:.78rem;line-height:1.25}.edu-calculator__screen{padding:.55rem}.edu-calculator__screen output{margin-top:.2rem}.edu-calculator__scientific{grid-template-columns:repeat(5,1fr)}.edu-calculator__scientific,.edu-calculator__keys{gap:.3rem;margin-top:.35rem}.edu-calculator__scientific button,.edu-calculator__keys button{min-height:40px;padding:.2rem;font-size:.88rem}.edu-calculator__history{margin-top:.4rem;padding:.45rem .6rem}.edu-calculator__history summary{font-size:.82rem}}