.science-main{min-width:0}.science-hero{padding:28px 32px;background:linear-gradient(135deg,#fff 0%,#fff7ed 70%,#ffedd5 100%);border:1px solid #fed7aa;border-radius:20px;box-shadow:0 8px 24px rgba(234,88,12,.06)}
.science-eyebrow{color:#c2410c;font-size:11px;font-weight:900;letter-spacing:.13em}.science-hero h1{margin:7px 0 8px;font-size:34px;line-height:1.15;letter-spacing:-.03em;color:#172033}.science-hero>p{margin:0;color:#667085;font-size:14px;line-height:1.7}.science-controls{display:flex;align-items:end;flex-wrap:wrap;gap:12px;margin-top:21px}.science-controls label{display:grid;gap:5px;color:#667085;font-size:11px;font-weight:800}.science-controls select{min-width:142px;padding:10px 12px;border:1px solid #e5eaf0;border-radius:10px;background:#fff;color:#25334a;font:inherit;font-size:13px}.language-switch{display:flex;gap:3px;padding:4px;margin-left:auto;border:1px solid #f2dfcc;background:#fff;border-radius:11px}.language-switch button{border:0;border-radius:8px;padding:8px 10px;background:transparent;color:#667085;font:inherit;font-size:11px;font-weight:800;cursor:pointer}.language-switch button.active{background:linear-gradient(135deg,#ea580c,#f59e0b);color:#fff}
.science-unit{display:grid;gap:15px;margin-top:17px}.science-unit-heading{padding:21px 25px;background:#fff;border:1px solid #e5eaf0;border-radius:16px}.science-unit-heading small{color:#c2410c;font-size:11px;font-weight:900;letter-spacing:.1em}.science-unit-heading h2{margin:4px 0 0;color:#1d2939;font-size:24px;line-height:1.3}.science-lesson{overflow:hidden;border:1px solid #e5eaf0;border-radius:15px;background:#fff;box-shadow:0 4px 15px rgba(15,23,42,.03)}.science-lesson>summary{display:flex;align-items:center;gap:12px;padding:17px 20px;cursor:pointer;list-style:none}.science-lesson>summary::-webkit-details-marker{display:none}.science-lesson>summary:after{content:'⌄';margin-left:auto;color:#9a3412;font-size:18px}.science-lesson[open]>summary:after{content:'⌃'}.science-lesson>summary:hover{background:#fffaf5}.lesson-number{display:grid;place-items:center;flex:0 0 38px;height:38px;border-radius:11px;background:#fff7ed;color:#c2410c;font-size:12px;font-weight:900}.science-lesson-title{font-size:15px;font-weight:850;color:#25334a;line-height:1.4}.lesson-content{padding:0 20px 20px}.science-section{padding:15px 0;border-top:1px solid #f0f2f5}.science-section h3{margin:0 0 10px;font-size:14px;color:#344054}.science-block{margin:7px 0;color:#475467;font-size:13.5px;line-height:1.75;white-space:pre-wrap}.science-block[data-lang="en"]:before{content:'EN';display:inline-block;margin-right:7px;color:#c2410c;font-size:9px;font-weight:900;vertical-align:2px}.science-block[data-lang="vi"]:before{content:'VI';display:inline-block;margin-right:7px;color:#0f766e;font-size:9px;font-weight:900;vertical-align:2px}.science-block.hidden-language{display:none}.vocab-title{margin:15px 0 8px;color:#344054;font-size:12px;font-weight:900}.science-vocab-wrap{overflow:auto;border:1px solid #e8edf2;border-radius:11px}.science-vocab{width:100%;border-collapse:collapse;font-size:12px}.science-vocab th,.science-vocab td{padding:10px 12px;border-bottom:1px solid #eef1f4;text-align:left;vertical-align:top}.science-vocab th{background:#fffaf5;color:#9a3412;font-size:10px;letter-spacing:.04em}.science-vocab tr:last-child td{border-bottom:0}.science-vocab td:first-child{font-weight:800;color:#25334a}.science-vocab td:nth-child(2){font-family:Georgia,serif;color:#475467;white-space:nowrap}.science-done{display:flex;align-items:center;gap:8px;margin:14px 0 0;padding:10px 12px;border-radius:10px;background:#f8fafc;color:#475467;font-size:12px;font-weight:750}.science-done input{accent-color:#ea580c;width:16px;height:16px}.science-source-note{margin:13px 2px 0;color:#8b95a5;font-size:11px;line-height:1.6}.science-loading,.science-error{padding:25px;background:#fff;border:1px solid #e5eaf0;border-radius:14px;color:#667085}
@media(max-width:900px){.science-controls{align-items:stretch}.science-controls label{flex:1}.science-controls select{width:100%}.language-switch{margin-left:0}}@media(max-width:620px){.science-hero{padding:23px 19px}.science-hero h1{font-size:28px}.science-controls{display:grid;grid-template-columns:1fr 1fr}.language-switch{grid-column:1/-1;justify-content:stretch}.language-switch button{flex:1}.science-lesson>summary{padding:14px}.lesson-content{padding:0 14px 15px}.science-unit-heading{padding:18px}.science-unit-heading h2{font-size:21px}}