/* Isolated light interface for the tRNA and amino-acid introduction. */
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.gti__choices{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:8px}.gti__choices>button{position:relative;display:grid;min-height:186px;place-items:center;padding:9px 3px;background:#fff;border:1px solid #cfdedc;border-radius:12px;box-shadow:0 5px 12px rgba(42,78,82,.07);cursor:pointer}.gti__choices>button:hover{background:#f5faf8;border-color:#6db9a2;transform:translateY(-2px)}.gti__choices .gti__trna{transform:scale(.84)}.gti__choices em{position:absolute;top:7px;right:9px;color:#71878c;font-size:.62rem;font-style:normal;font-weight:900}
.gti__lesson--complete .gti__ribosome-card{min-height:340px}.gti__trna--paired{position:absolute;top:38px;left:50%;z-index:6;transform:translateX(-50%) scale(.88)}.gti__hydrogen-bonds{position:absolute;bottom:76px;left:50%;z-index:7;display:flex;gap:5px;transform:translateX(-50%)}.gti__hydrogen-bonds i{width:3px;height:18px;background:repeating-linear-gradient(to bottom,#34aee9 0 4px,transparent 4px 7px)}.gti__summary{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}.gti__summary p{margin:0;padding:13px;color:#52686e;background:#f5f9f8;border:1px solid var(--gti-line);border-radius:10px;font-size:.74rem;line-height:1.45}.gti__summary strong{color:#2c8c72}.gti__ready{margin:0!important;color:#226b59!important;font-weight:850;text-align:center}
.gti__feedback{min-height:1.4em;margin:2px 0 0!important;color:#5c7076!important;font-size:.75rem!important;font-weight:800;text-align:center}.gti__feedback[data-type="correct"]{color:#218366!important}.gti__feedback[data-type="wrong"]{color:#c35750!important}.gti__footer{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:11px 15px;color:#60777d;background:#f5f9f8;border-top:1px solid var(--gti-line);font-size:.72rem}.gti__footer button{padding:7px 10px;color:#45636a;background:#fff;border:1px solid #bdd5d1;border-radius:8px;cursor:pointer}
@container (max-width:700px){.gti__stage{min-height:600px}.gti__choices{grid-template-columns:repeat(3,minmax(0,1fr))}.gti__choices>button{min-height:166px}.gti__fact,.gti__protein-fact{grid-template-columns:1fr}.gti__summary{grid-template-columns:1fr}.gti__hotspot--amino{left:3%}.gti__hotspot--anticodon{right:3%}.gti__protein-ready{align-items:flex-start;flex-direction:column}.gti__protein-ready button{width:100%}.gti__codon-task{align-items:flex-start;flex-direction:column}.gti__codon-task>div:last-child{justify-content:flex-start}.gti__code-facts{grid-template-columns:1fr}.gti__codon-result{gap:8px}.gti__result-amino{min-width:140px}}
@container (max-width:470px){.gti__header{padding-inline:10px}.gti__header h3{font-size:.9rem}.gti__stage{min-height:640px;padding:16px 10px}.gti__explore-card{min-height:350px}.gti__trna--large{top:47%}.gti__hotspot{min-width:126px;padding:7px}.gti__hotspot--amino{top:12px;left:8px}.gti__hotspot--anticodon{right:8px;bottom:12px}.gti__hotspot::after{display:none}.gti__choices,.gti__amino-builder{grid-template-columns:repeat(2,minmax(0,1fr))}.gti__choices>button:last-child,.gti__amino-builder>button:last-child{grid-column:1/-1}.gti__ribosome{width:350px}.gti__ribosome-large{width:280px}.gti__protein-chain{justify-content:flex-start}.gti__protein-chain>span{width:52px;height:52px}.gti__codon-result{flex-direction:column}.gti__codon-result>i{transform:rotate(90deg)}.gti__result-amino{width:100%}.gti__footer{align-items:flex-start;flex-direction:column}.gti__footer button{align-self:flex-end}}
@keyframes gti-amino-join{from{opacity:.35;transform:translateY(-12px) scale(.8)}to{opacity:1;transform:none}}
/* Guided genetic-code lesson and compact 20-amino-acid library. */
.gti__amino-library-heading,.gti__trna-pool-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:12px;color:#51676d}.gti__amino-library-heading strong,.gti__trna-pool-heading strong{color:#2b6558;font-size:.76rem}.gti__amino-library-heading span,.gti__trna-pool-heading span{font-size:.64rem}.gti__amino-builder{grid-template-columns:repeat(5,minmax(0,1fr));gap:6px}.gti__amino-builder button{min-height:54px;grid-template-columns:35px 1fr;place-content:unset;align-items:center;gap:6px;padding:7px 9px;text-align:left}.gti__amino-builder button strong{display:grid;width:34px;height:34px;place-items:center;background:rgba(255,255,255,.55);border:1px solid rgba(38,56,61,.15);border-radius:50%;font-size:.72rem}.gti__amino-builder button span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.gti__decode-guide{display:flex;align-items:center;justify-content:center;gap:9px;padding:9px 12px;color:#435a60;background:#eef8f5;border:1px solid #bcded4;border-radius:12px}.gti__decode-guide>span{display:grid;min-width:128px;grid-template-columns:25px 1fr 28px;align-items:center;gap:6px;padding:6px 8px;background:#fff;border:1px solid #cadfdb;border-radius:9px}.gti__decode-guide b{display:grid;width:23px;height:23px;place-items:center;color:#fff;background:#328d74;border-radius:50%;font-size:.64rem}.gti__decode-guide small{font-size:.58rem}.gti__decode-guide strong{font:900 .9rem Consolas,"Courier New",monospace;text-align:right}.gti__decode-guide>i{color:#4c9b86;font-style:normal;font-weight:900}.gti__codon-task>div:last-child span.is-current{color:#76581a;background:#fff4cf;border-color:#e3b94e;box-shadow:0 0 0 2px rgba(227,185,78,.14)}.gti__codon-column.is-guide,.gti__codon-row.is-guide{outline:4px solid #43a98d;outline-offset:1px;box-shadow:0 0 0 7px rgba(67,169,141,.15)}.gti__codon-cell.is-guide-cell{background:#e8f7f2;border:2px solid #5ab499}.gti__codon-cell button{grid-template-columns:38px minmax(0,1fr) auto}.gti__codon-cell button small{display:flex;align-items:center;gap:3px;color:#73868b;font-size:.43rem;white-space:nowrap}.gti__codon-cell button small b{display:grid;width:17px;height:17px;place-items:center;color:#2f6256;background:#e7f4f0;border-radius:50%;font-size:.52rem}.gti__codon-cell button.is-target{outline:3px solid rgba(228,175,46,.24)}.gti__trna-pool-heading{padding-top:2px}.gti__trna-pool{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:7px}.gti__trna-choice{display:grid;min-height:82px;grid-template-columns:38px 1fr;grid-template-rows:38px auto;align-items:center;gap:4px 6px;padding:6px;color:#31474d;background:#fff;border:2px solid #d3e1df;border-radius:12px;box-shadow:0 4px 10px rgba(42,78,82,.06);cursor:pointer}.gti__trna-choice:hover{border-color:#65b89f;box-shadow:0 7px 14px rgba(42,78,82,.11);transform:translateY(-2px)}.gti__choice-amino{display:grid;width:36px;height:36px;place-items:center;align-content:center;background:var(--gti-amino);border:1px solid rgba(65,79,83,.2);border-radius:50%}.gti__choice-amino b{font-size:.6rem}.gti__choice-amino small{max-width:33px;overflow:hidden;font-size:.36rem;text-overflow:ellipsis;white-space:nowrap}.gti__choice-trna{display:grid;height:34px;place-items:center;color:#76599d;background:#e9e0f7;border:2px solid #a688cf;border-radius:10px 10px 18px 18px;font-size:.48rem;font-weight:900}.gti__choice-anticodon{display:grid;grid-column:1/-1;gap:2px;text-align:center}.gti__choice-anticodon>small{color:#75878c;font-size:.42rem;font-weight:900;letter-spacing:.07em}.gti__choice-anticodon>strong{display:flex;align-items:center;justify-content:center;gap:2px;color:#61747a;font:800 .5rem Consolas,"Courier New",monospace}.gti__trna-choice .gti__anti-base{width:18px;height:19px;border-width:1px;font-size:.52rem}
@container (max-width:760px){.gti__amino-builder,.gti__trna-pool{grid-template-columns:repeat(4,minmax(0,1fr))}.gti__decode-guide{align-items:stretch;gap:5px}.gti__decode-guide>span{min-width:0;grid-template-columns:22px 1fr;flex:1}.gti__decode-guide>span strong{grid-column:1/-1;text-align:center}.gti__decode-guide>i{align-self:center}.gti__codon-cell button small{display:none}}
@container (max-width:470px){.gti__amino-library-heading,.gti__trna-pool-heading{align-items:flex-start;flex-direction:column;gap:3px}.gti__amino-builder,.gti__trna-pool{grid-template-columns:repeat(2,minmax(0,1fr))}.gti__amino-builder>button:last-child,.gti__trna-pool>button:last-child{grid-column:auto}.gti__decode-guide{display:grid;grid-template-columns:1fr}.gti__decode-guide>i{transform:rotate(90deg);text-align:center}.gti__decode-guide>span{grid-template-columns:25px 1fr 28px}.gti__decode-guide>span strong{grid-column:auto}.gti__codon-map{min-width:800px}}
.gti__codon-cell{grid-template-columns:1fr}.gti__codon-cell button{min-height:24px}
/* Reading-frame bridge: amino-acid chain -> mRNA codons -> genetic code. */
.gti__lesson--frame{max-width:1050px;gap:14px}.gti__frame-task{display:grid;gap:14px;padding:16px;background:linear-gradient(135deg,#f4faf8,#f5f1fb);border:1px solid #c9ded9;border-radius:16px;box-shadow:0 10px 24px rgba(42,78,82,.07)}.gti__frame-task.is-found{background:linear-gradient(135deg,#edf9f4,#f4effc);border-color:#82c7b2}.gti__frame-prompt{display:flex;align-items:flex-end;justify-content:space-between;gap:12px;color:#536970}.gti__frame-prompt strong{color:#256b59;font-size:.8rem}.gti__frame-prompt span{font-size:.67rem}.gti__frame-flat{display:grid;grid-template-columns:30px 1fr 30px;align-items:center;gap:8px;overflow-x:auto;padding:8px 5px}.gti__frame-flat>strong,.gti__frame-grouped>strong{color:#2f7765;font:900 .76rem Consolas,"Courier New",monospace}.gti__frame-flat>div{display:flex;min-width:780px;justify-content:center;gap:2px;padding:9px;background:#fff;border:1px solid #d5e4e1;border-radius:10px}.gti__frame-base{display:grid;width:34px;height:38px;place-items:center;color:#24383d;background:#eef3f2;border:1px solid #bfd2cf;border-radius:6px;font:900 .74rem Consolas,"Courier New",monospace}.gti__frame-flat button{cursor:pointer}.gti__frame-flat button:hover{z-index:2;border-color:#3fa384;box-shadow:0 0 0 3px rgba(63,163,132,.16);transform:translateY(-2px)}.gti__frame-base[data-base="A"]{background:#ffd477;border-color:#dfa93d}.gti__frame-base[data-base="U"]{color:#fff;background:#9861d4;border-color:#7844ad}.gti__frame-base[data-base="C"]{background:#68d5a6;border-color:#3daf80}.gti__frame-base[data-base="G"]{background:#b69ae6;border-color:#876ac1}.gti__frame-grouped{display:grid;min-width:900px;grid-template-columns:30px minmax(205px,2fr) repeat(5,minmax(94px,1fr)) 30px;align-items:stretch;gap:8px;overflow-x:auto;padding:8px 5px}.gti__frame-grouped>strong{align-self:center}.gti__frame-utr,.gti__frame-codon{display:grid;align-content:center;justify-content:center;gap:4px;padding:8px;background:#fff;border:2px solid #cadcd9;border-radius:10px}.gti__frame-utr{grid-template-columns:repeat(6,34px);background:#f3f6f5;border-style:dashed}.gti__frame-codon{grid-template-columns:repeat(3,34px)}.gti__frame-utr small,.gti__frame-codon small{grid-column:1/-1;color:#677c81;font-size:.48rem;font-weight:900;letter-spacing:.04em;text-align:center}.gti__frame-codon.is-start{background:#fff8df;border-color:#e3b74c;box-shadow:0 0 0 4px rgba(227,183,76,.13)}.gti__frame-codon.is-start small{color:#8a6819}.gti__frame-codon.is-stop{background:#fff0ef;border-color:#df8a82}.gti__frame-codon.is-stop small{color:#a34f49}.gti__frame-hint{display:grid;grid-template-columns:220px 1fr;gap:12px;padding:13px 15px;color:#52686e;background:#fff8e7;border:1px solid #ead09a;border-left:5px solid #edbd55;border-radius:10px;font-size:.72rem;line-height:1.45}.gti__frame-hint strong{color:#5c4b26}.gti__frame-explanation{display:grid;grid-template-columns:minmax(220px,.7fr) 1.3fr;gap:10px}.gti__frame-explanation>div:first-child{display:grid;align-content:center;gap:4px;padding:13px 15px;color:#52686e;background:#eef8f5;border:1px solid #bdded4;border-radius:11px;font-size:.7rem;line-height:1.45}.gti__frame-explanation>div:first-child strong{color:#276b5b}.gti__frame-protein{display:grid;grid-template-columns:64px repeat(5,minmax(0,1fr));gap:4px;padding:9px;background:#fff;border:1px solid #d1e1de;border-radius:11px}.gti__frame-protein>span{display:grid;place-items:center;color:#61767b;font-size:.55rem;font-weight:900}.gti__frame-protein>b{display:grid;min-height:32px;place-items:center;color:#42585e;background:#edf5f3;border-radius:6px;font:900 .62rem Consolas,"Courier New",monospace}.gti__frame-protein>b:nth-last-child(-n+5){background:#f0eafb}.gti__direction-check{display:grid;grid-template-columns:1fr 140px 140px;align-items:center;gap:9px;padding:11px 13px;background:#fff;border:1px solid #cbdedb;border-radius:11px}.gti__direction-check>div{display:grid;gap:2px;color:#52686e;font-size:.66rem}.gti__direction-check>div strong{color:#344f55;font-size:.73rem}.gti__direction-check button{min-height:42px;color:#34565a;background:#f8fbfa;border:2px solid #b8d3ce;border-radius:9px;cursor:pointer;font:900 .75rem Consolas,"Courier New",monospace}.gti__direction-check button:hover{border-color:#5bad95}.gti__direction-check button.is-correct{color:#17664f;background:#dcf4ea;border-color:#58b493}
@container (max-width:700px){.gti__frame-prompt{align-items:flex-start;flex-direction:column}.gti__frame-hint,.gti__frame-explanation{grid-template-columns:1fr}.gti__direction-check{grid-template-columns:1fr 1fr}.gti__direction-check>div{grid-column:1/-1}}
@container (max-width:470px){.gti__frame-task{padding:11px 8px}.gti__frame-flat{grid-template-columns:24px 1fr 24px}.gti__frame-base{width:30px;height:34px}.gti__direction-check{grid-template-columns:1fr 1fr}.gti__frame-protein{grid-template-columns:52px repeat(5,minmax(42px,1fr));overflow-x:auto}.gti__frame-protein>b{min-width:42px}}
.gti__frame-grouped{width:100%;min-width:0;grid-template-columns:30px 205px repeat(5,94px) 30px}.gti__frame-explanation{min-width:0;grid-template-columns:minmax(220px,.7fr) minmax(0,1.3fr)}.gti__frame-protein,.gti__direction-check{min-width:0}
@container (max-width:700px){.gti__frame-explanation{grid-template-columns:1fr}}
/* Alphabetical groups make the 20 tRNA choices easier to scan without hiding any distractors. */
.gti__trna-groups{display:grid;gap:7px}.gti__trna-group{display:grid;grid-template-columns:34px minmax(0,1fr);align-items:stretch;gap:7px}.gti__trna-group>strong{display:grid;place-items:center;color:#397263;background:#e4f3ee;border:1px solid #b9d9d0;border-radius:10px;font:900 .59rem Consolas,"Courier New",monospace;letter-spacing:.04em;writing-mode:vertical-rl;transform:rotate(180deg)}
@container (max-width:760px){.gti__trna-group .gti__trna-pool{grid-template-columns:repeat(5,minmax(0,1fr))}}
@container (max-width:600px){.gti__trna-group .gti__trna-pool{grid-template-columns:repeat(3,minmax(0,1fr))}}
@container (max-width:470px){.gti__trna-group{grid-template-columns:28px minmax(0,1fr);gap:5px}.gti__trna-group .gti__trna-pool{grid-template-columns:repeat(2,minmax(0,1fr));gap:5px}.gti__trna-group>strong{font-size:.53rem}}
@media (prefers-reduced-motion:reduce){.gb-translation-intro *,.gb-translation-intro *::before,.gb-translation-intro *::after{animation-duration:.01ms!important;transition-duration:.01ms!important}}

/* The introduction now uses the exact same codon-table language as Level 3. */
.gti__code-table{box-shadow:0 8px 20px rgba(42,78,82,.07)}
.gti__code-table .gt3__code-cell>button.is-found{z-index:2;color:#174c3b;background:#d9f5e9;border:2px solid #46a986;box-shadow:0 3px 9px rgba(42,120,93,.14)}
.gti__code-table .gt3__code-cell>button.is-found::after{justify-self:end;content:"✓";color:#278d72;font-size:.62rem;font-weight:900}
.gti__code-insight{display:grid;grid-template-columns:260px 1fr;gap:14px;padding:12px 14px;color:#52686e;background:#fff8e7;border:1px solid #ead09a;border-left:5px solid #edbd55;border-radius:11px;font-size:.72rem;line-height:1.45}
.gti__code-insight strong{color:#5c4b26}
.gti__lesson--pairing .gti__trna-pool{grid-template-columns:repeat(4,minmax(0,1fr));max-width:780px;width:100%;margin-inline:auto}
.gti__lesson--pairing .gti__trna-choice{min-height:96px}
@container (max-width:700px){.gti__code-insight{grid-template-columns:1fr}.gti__lesson--codons .gti__code-facts{grid-template-columns:repeat(3,minmax(0,1fr))}}
@container (max-width:470px){.gti__lesson--codons .gti__code-facts{grid-template-columns:1fr}.gti__lesson--pairing .gti__trna-pool{grid-template-columns:repeat(2,minmax(0,1fr))}}