.bac-section{background:linear-gradient(145deg,#eff8f8,#fff8e8);border-block:1px solid #d5e9e5;padding:clamp(32px,5vw,68px) 0}
.bac-section .bac-head{max-width:1100px;margin:0 auto 24px;padding:0 24px}
.bac-section .bac-head h2{font-size:clamp(1.9rem,3.4vw,3.1rem);line-height:1.15;margin:.25em 0;color:#10364a}
.bac-section .bac-head h3{font-size:clamp(1.1rem,2vw,1.5rem);margin:.4em 0;color:#165c66}
.bac-section .bac-head p{max-width:65ch;font-size:1.05rem;line-height:1.7}
.bac-grid{max-width:1100px;margin:auto;padding:0 24px;display:grid;grid-template-columns:minmax(0,1.12fr) minmax(0,1fr);align-items:start;gap:24px}
.bac-video-card,.bac-learning{min-width:0;background:#fff;border:1px solid #d8e8e6;border-radius:22px;box-shadow:0 14px 36px rgba(17,63,75,.09);overflow:hidden}
.bac-video-card{padding:12px}.bac-frame{position:relative;aspect-ratio:16/9;background:#102e4a;border-radius:14px;overflow:hidden}
.bac-frame iframe,.bac-frame button,.bac-frame img{width:100%;height:100%;border:0}.bac-frame iframe{display:block}.bac-frame button{display:block;position:relative;padding:0;background:#102e4a;cursor:pointer}.bac-frame img{object-fit:cover;display:block}.bac-frame button:focus-visible,.bac-learning button:focus-visible,.bac-learning input:focus-visible{outline:3px solid #ecaa39;outline-offset:3px}.bac-play{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);display:grid;place-items:center;width:70px;height:70px;border-radius:50%;background:#fff;color:#134658;font-size:26px;box-shadow:0 6px 26px #102e4a80}.bac-video-card p{font-size:.92rem;line-height:1.5;color:#355967;margin:14px 7px 5px}.bac-video-card a{color:#135c75;text-decoration:underline}.bac-learning{padding:22px;min-height:320px;color:#173848}.bac-learning h3{font-size:1.35rem;line-height:1.4;margin:14px 0}.bac-tabs{display:flex;gap:8px;border-bottom:1px solid #dbe8e6;margin:-3px 0 18px;padding-bottom:10px}.bac-tabs button{border:0;border-radius:30px;padding:10px 15px;background:#edf5f4;color:#315c63;font-weight:700;cursor:pointer}.bac-tabs button.is-active{background:#13495a;color:#fff}.bac-eyebrow{letter-spacing:.1em;font-size:.75rem;font-weight:800;color:#28737b}.bac-course,.bac-buttons{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.bac-primary,.bac-secondary,.bac-hint{border-radius:10px;padding:11px 16px;font-weight:700;line-height:1.4;cursor:pointer}.bac-primary{background:#135d67;color:#fff;border:1px solid #135d67}.bac-secondary,.bac-hint{background:#fff;color:#135d67;border:1px solid #8ab4b2}.bac-primary:hover{background:#0d4752}.bac-note{color:#4b666e;font-size:.88rem;line-height:1.5}.bac-progress{display:flex;justify-content:space-between;font-size:.9rem;color:#29656c}.bac-progress-bar{height:6px;border-radius:9px;background:#e3eeec;margin:9px 0 20px;overflow:hidden}.bac-progress-bar span{display:block;height:100%;background:#25a29a;transition:width .2s}.bac-learning fieldset{padding:0;border:0;margin:0}.bac-learning legend{font-size:1.13rem;font-weight:800;line-height:1.55;margin-bottom:12px}.bac-term{font-size:1.3rem;font-weight:800;color:#135d67}.bac-option{display:flex;align-items:flex-start;gap:10px;border:1px solid #d4e5e2;border-radius:10px;margin:8px 0;padding:11px;line-height:1.5;cursor:pointer}.bac-option:has(input:checked){background:#e8f7f4;border-color:#278d89}.bac-option input{margin-top:.36em;accent-color:#135d67}.bac-feedback{margin-top:18px;padding:14px 16px;border-radius:12px;background:#edf8f2;border:1px solid #c6e4d3;line-height:1.55}.bac-feedback p{margin:.45em 0}.bac-feedback blockquote{border-left:3px solid #4da093;margin:.4em 0;padding-left:12px;font-size:.95rem}.bac-next{margin-top:14px}.bac-result{text-align:center;padding:20px 0}.bac-result strong{display:block;font-size:3rem;color:#176b70}.bac-select-label{display:block;font-weight:700}.bac-select-label span{display:block;margin-bottom:8px}.bac-select-label select{width:100%;padding:11px;border:1px solid #abc9c7;border-radius:10px;background:white;font:inherit}.bac-lines{max-height:510px;overflow:auto;margin-top:12px}.bac-line{display:block;width:100%;text-align:left;border:0;border-bottom:1px solid #e3eeeb;background:#fff;color:#183f4b;padding:12px 6px;line-height:1.55;cursor:pointer}.bac-line:hover{background:#f0f9f7}.bac-line span,.bac-line small{display:block}.bac-line small{font-size:.92rem;color:#4a6870;margin-top:3px}.bac-note[hidden],.bac-next[hidden],.bac-feedback[hidden]{display:none}
@media(max-width:760px){.bac-grid{grid-template-columns:1fr;padding:0 16px;gap:16px}.bac-section .bac-head{padding:0 16px}.bac-learning{padding:18px;min-height:0}.bac-tabs button{flex:1}.bac-play{width:58px;height:58px}.bac-section{padding:32px 0}}