/* ==========================================================
   SimpleAIHub — Lesson 29
   Semantic Similarity
========================================================== */

.lesson29-page,.lesson29-page *{box-sizing:border-box}
.lesson29-page{min-width:0;overflow-x:clip}
.lesson29-content{width:100%;min-width:0;padding:0 0 60px;color:#172033}
.lesson29-breadcrumb{margin-bottom:18px;color:#667085;font-size:14px}
.lesson29-breadcrumb a{color:#5b21b6;text-decoration:none}
.lesson29-breadcrumb span{padding:0 7px}
.lesson29-hero{padding-bottom:28px;border-bottom:1px solid #e7eaf0}
.lesson29-label,.lesson29-practice-label,.lesson29-quiz-label,.lesson29-recap-label{color:#5b21b6;font-size:14px;font-weight:800;letter-spacing:.07em}
.lesson29-hero h1{margin:7px 0 12px;color:#172033;font-size:46px;line-height:1.08}
.lesson29-hero p{max-width:850px;margin:0;color:#475467;font-size:18px;line-height:1.7}
.lesson29-meta{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px;color:#667085;font-size:14px}
.lesson29-objectives{margin:24px 0;padding:20px;border:1px solid #e4e7ec;border-radius:12px;background:#f8fafc}
.lesson29-objectives h2{margin:0 0 10px;font-size:21px}
.lesson29-objectives ul{margin:0;padding-left:20px}
.lesson29-objectives li{margin:7px 0;color:#475467;font-size:15px;line-height:1.6}
.lesson29-section{display:grid;grid-template-columns:36px minmax(0,1fr);gap:14px;width:100%;margin:38px 0}
.lesson29-number{width:34px;height:34px;display:flex;align-items:center;justify-content:center;border-radius:50%;background:#eee8ff;color:#5b21b6;font-size:14px;font-weight:800}
.lesson29-body{min-width:0}
.lesson29-body h2{margin:0 0 10px;font-size:28px;line-height:1.25}
.lesson29-body h3{margin:8px 0;font-size:18px}
.lesson29-body p{margin:9px 0;color:#475467;font-size:16px;line-height:1.75}
.lesson29-body code{padding:2px 5px;border-radius:4px;background:#f2f4f7;font-size:.9em}

.lesson29-meaning-card{margin:20px 0;padding:22px;border:1px solid #d8c7f7;border-radius:12px;background:#faf8ff}
.lesson29-meaning-row{display:grid;grid-template-columns:1fr auto 1fr;gap:14px;align-items:center}
.lesson29-text{padding:16px;border:1px solid #e4e7ec;border-radius:10px;background:#fff}
.lesson29-text span{display:block;color:#667085;font-size:11px;font-weight:800;letter-spacing:.07em;margin-bottom:8px}
.lesson29-text strong{display:block;color:#24163e;font-size:16px;line-height:1.55}
.lesson29-similarity-pill{padding:9px 12px;border-radius:999px;background:#eee8ff;color:#5b21b6;font-size:11px;font-weight:800;letter-spacing:.06em;text-align:center}

.lesson29-callout{display:grid;grid-template-columns:max-content minmax(0,1fr);gap:10px;align-items:start;min-width:0;margin:17px 0;padding:15px 16px;border-left:3px solid #7c3aed;border-radius:0 9px 9px 0;background:#faf8ff}
.lesson29-callout strong{color:#5b21b6;font-size:15px;line-height:1.6}
.lesson29-callout span{min-width:0;color:#475467;font-size:15px;line-height:1.6;overflow-wrap:anywhere}
.lesson29-callout--green{border-left-color:#147a55;background:#f5fbf8}
.lesson29-callout--green strong{color:#147a55}
.lesson29-callout--amber{border-left-color:#b7791f;background:#fffaf0}
.lesson29-callout--amber strong{color:#9a6700}

.lesson29-compare{display:grid;grid-template-columns:1fr auto 1fr;gap:12px;align-items:center;margin:20px 0}
.lesson29-compare-card{min-width:0;padding:18px;border:1px solid #e4e7ec;border-radius:11px;background:#fff}
.lesson29-compare-card--purple{border-color:#d8c7f7;background:#faf8ff}
.lesson29-compare-card>span{color:#667085;font-size:11px;font-weight:800;letter-spacing:.07em}
.lesson29-compare-card--purple>span{color:#5b21b6}
.lesson29-compare-card h3{font-size:18px}
.lesson29-compare-card p{font-size:14px}
.lesson29-result{margin-top:13px;padding:9px 10px;border-radius:8px;background:#f8fafc;color:#475467;font-size:13px;font-weight:700}
.lesson29-vs{color:#7c3aed;font-weight:800}

.lesson29-flow{display:grid;grid-template-columns:1fr auto 1fr auto 1fr auto 1fr auto 1fr;gap:8px;align-items:center;margin:22px 0}
.lesson29-flow>div{min-width:0;min-height:105px;padding:14px;border:1px solid #e4e7ec;border-radius:10px;background:#fff;text-align:center}
.lesson29-flow>div span{display:block;color:#5b21b6;font-size:11px;font-weight:800}
.lesson29-flow>div b{display:block;margin:7px 0 5px;font-size:14px}
.lesson29-flow>div small{display:block;color:#667085;font-size:12px;line-height:1.4}
.lesson29-flow>i,.lesson29-search-flow>i,.lesson29-rag>i{color:#7c3aed;font-style:normal;font-weight:800}
.lesson29-flow-compare{border-color:#d8c7f7!important;background:#faf8ff!important}

.lesson29-example-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:20px 0}
.lesson29-example{padding:18px;border:1px solid #b9dfcf;border-radius:11px;background:#f5fbf8}
.lesson29-example--low{border-color:#e4e7ec;background:#f8fafc}
.lesson29-example-score{display:inline-block;margin-bottom:10px;padding:5px 8px;border-radius:6px;background:#e8f6ef;color:#147a55;font-size:10px;font-weight:800;letter-spacing:.07em}
.lesson29-example--low .lesson29-example-score{background:#eef1f5;color:#667085}
.lesson29-example b,.lesson29-example span{display:block;font-size:14px;line-height:1.55}
.lesson29-example span{margin-top:8px;color:#475467}

.lesson29-score-board{margin:20px 0;padding:20px;border:1px solid #e4e7ec;border-radius:12px;background:#fff}
.lesson29-score-title{margin-bottom:14px;color:#667085;font-size:11px;font-weight:800;letter-spacing:.08em}
.lesson29-score-row{display:grid;grid-template-columns:minmax(0,1fr) 50px;gap:8px;margin:14px 0;align-items:center}
.lesson29-score-row>span{font-size:14px;color:#344054}
.lesson29-score-row>b{text-align:right;color:#5b21b6;font-size:14px}
.lesson29-score-row>div{grid-column:1 / -1;height:8px;border-radius:99px;background:#edf0f3;overflow:hidden}
.lesson29-score-row i{display:block;height:100%;border-radius:99px;background:#7c3aed}

.lesson29-formula{margin:20px 0;padding:22px;border:1px solid #d8c7f7;border-radius:12px;background:#faf8ff;text-align:center}
.lesson29-formula span{display:block;color:#667085;font-size:11px;font-weight:800;letter-spacing:.08em}
.lesson29-formula strong{display:block;margin:12px 0;color:#5b21b6;font:700 22px/1.5 ui-monospace,SFMono-Regular,Menlo,monospace;overflow-wrap:anywhere}
.lesson29-formula small{display:block;color:#667085;font-size:13px}

.lesson29-geometry{position:relative;height:285px;margin:22px 0;border:1px solid #e4e7ec;border-radius:12px;background:#fff;overflow:hidden}
.lesson29-axis-x{position:absolute;left:10%;right:10%;top:68%;height:1px;background:#d9dee5}
.lesson29-axis-y{position:absolute;top:12%;bottom:14%;left:30%;width:1px;background:#d9dee5}
.lesson29-origin{position:absolute;left:30%;top:68%;width:8px;height:8px;border-radius:50%;background:#344054;transform:translate(-50%,-50%)}
.lesson29-vector-line{position:absolute;left:30%;top:68%;height:3px;transform-origin:left center;border-radius:4px;background:#7c3aed}
.lesson29-vector-a{width:245px;transform:rotate(-28deg)}
.lesson29-vector-b{width:215px;transform:rotate(-13deg)}
.lesson29-vector-label{position:absolute;color:#5b21b6;font-weight:800;font-size:14px}
.lesson29-vector-label-a{left:71%;top:29%}
.lesson29-vector-label-b{left:72%;top:48%}
.lesson29-angle{position:absolute;left:36%;top:57%;color:#667085;font-size:13px;font-weight:800}

.lesson29-code{margin:20px 0;border:1px solid #202938;border-radius:11px;overflow:hidden;background:#111827}
.lesson29-codebar{display:flex;justify-content:space-between;gap:10px;padding:10px 14px;background:#1f2937;color:#e5e7eb;font-size:12px;font-weight:800}
.lesson29-code pre{margin:0;padding:18px;overflow:auto;color:#f3f4f6;font:14px/1.65 ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace}
.lesson29-code-note{display:grid;grid-template-columns:max-content minmax(0,1fr);gap:10px;margin:14px 0;padding:13px 15px;border-radius:9px;background:#f8fafc}
.lesson29-code-note b{color:#344054;font-size:14px}
.lesson29-code-note span{color:#475467;font-size:14px;line-height:1.6}

.lesson29-warning-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:20px 0}
.lesson29-warning-grid div{padding:16px;border:1px solid #e4e7ec;border-radius:10px;background:#fff}
.lesson29-warning-grid b,.lesson29-warning-grid span{display:block}
.lesson29-warning-grid b{color:#344054;font-size:15px}
.lesson29-warning-grid span{margin-top:6px;color:#667085;font-size:13px;line-height:1.5}

.lesson29-threshold{margin:22px 0;padding:20px;border:1px solid #e4e7ec;border-radius:12px;background:#fff}
.lesson29-threshold-track{position:relative;height:48px;margin:8px 0 22px;border-radius:99px;background:linear-gradient(90deg,#eef1f5 0 45%,#eee8ff 45% 72%,#e8f6ef 72% 100%)}
.lesson29-marker{position:absolute;top:15px;font-size:10px;font-weight:800;letter-spacing:.05em;color:#667085}
.marker-low{left:4%}.marker-target{left:49%;color:#5b21b6}.marker-high{right:4%;color:#147a55}
.lesson29-threshold-cards{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.lesson29-threshold-cards div{padding:14px;border:1px solid #e4e7ec;border-radius:9px;background:#f8fafc}
.lesson29-threshold-cards b,.lesson29-threshold-cards span{display:block}
.lesson29-threshold-cards b{font-size:14px}.lesson29-threshold-cards span{margin-top:5px;color:#667085;font-size:13px;line-height:1.5}

.lesson29-search-flow{display:grid;grid-template-columns:1fr auto 1fr auto 1fr auto 1fr;gap:8px;align-items:center;margin:22px 0}
.lesson29-search-flow>div,.lesson29-rag>div{min-width:0;padding:16px;border:1px solid #e4e7ec;border-radius:10px;background:#fff;text-align:center}
.lesson29-search-flow span{display:block;color:#5b21b6;font-size:11px;font-weight:800}
.lesson29-search-flow b,.lesson29-rag b{display:block;margin:6px 0;font-size:14px}
.lesson29-search-flow small,.lesson29-rag small{display:block;color:#667085;font-size:12px;line-height:1.45}

.lesson29-rag{display:grid;grid-template-columns:1fr auto 1fr auto 1fr auto 1fr auto 1fr;gap:7px;align-items:center;margin:22px 0}
.lesson29-rag-highlight{border-color:#d8c7f7!important;background:#faf8ff!important}

.lesson29-usecases{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.lesson29-usecases>div{padding:17px;border:1px solid #e4e7ec;border-radius:10px;background:#fff}
.lesson29-usecases span{display:block;color:#5b21b6;font-size:11px;font-weight:800}
.lesson29-usecases b{display:block;margin:6px 0;font-size:16px}
.lesson29-usecases p{margin:0;font-size:14px}

.lesson29-mistakes{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
.lesson29-mistakes>div{padding:16px;border:1px solid #e4e7ec;border-radius:10px;background:#fff}
.lesson29-mistakes b{display:block;font-size:15px}
.lesson29-mistakes p{margin:6px 0 0;font-size:14px}

.lesson29-practice{margin:42px 0;padding:25px;border:1px solid #d8c7f7;border-radius:14px;background:#faf8ff}
.lesson29-practice h2{margin:6px 0 10px;font-size:28px}
.lesson29-practice>p{color:#475467;font-size:16px;line-height:1.7}
.lesson29-practice ol{padding-left:22px}
.lesson29-practice li{margin:8px 0;color:#475467;font-size:15px;line-height:1.6}
.lesson29-practice-box{margin-top:18px;padding:15px;border-radius:9px;background:#fff;border:1px solid #e4e7ec;color:#475467;font-size:14px;line-height:1.6}
.lesson29-practice-box strong{color:#5b21b6}

.lesson29-quiz{margin:42px 0;padding:25px;border:1px solid #e4e7ec;border-radius:14px;background:#fff}
.lesson29-quiz h2{margin:6px 0 20px;font-size:28px}
.lesson29-question{padding:15px 0;border-top:1px solid #e7eaf0}
.lesson29-question strong{font-size:15px;color:#172033}
.lesson29-question p{margin:6px 0 0;color:#475467;font-size:15px;line-height:1.65}

.lesson29-recap{margin:42px 0;padding:25px;border-radius:14px;background:#172033;color:#fff}
.lesson29-recap h2{margin:6px 0 20px;font-size:28px;color:#fff}
.lesson29-recap-flow{display:grid;grid-template-columns:1fr auto 1fr auto 1fr auto 1fr auto 1fr;gap:8px;align-items:center}
.lesson29-recap-flow>div{padding:15px;border:1px solid rgba(255,255,255,.16);border-radius:9px;background:rgba(255,255,255,.05)}
.lesson29-recap-flow b,.lesson29-recap-flow span{display:block}
.lesson29-recap-flow b{font-size:14px}.lesson29-recap-flow span{margin-top:5px;color:#cbd5e1;font-size:12px;line-height:1.4}
.lesson29-recap-flow i{font-style:normal;color:#c4b5fd;font-weight:800}

.lesson29-takeaways{margin:42px 0;padding:22px;border:1px solid #e4e7ec;border-radius:12px;background:#f8fafc}
.lesson29-takeaways h2{margin:0 0 10px;font-size:24px}
.lesson29-takeaways ul{margin:0;padding-left:21px}
.lesson29-takeaways li{margin:8px 0;color:#475467;font-size:15px;line-height:1.6}

.lesson29-bottom-nav{display:flex;justify-content:space-between;gap:12px;margin-top:35px}
.lesson29-bottom-nav a{display:block;max-width:48%;padding:13px 15px;border:1px solid #e4e7ec;border-radius:9px;background:#fff;color:#5b21b6;text-decoration:none;font-size:14px;font-weight:700}
.lesson29-bottom-nav a:hover{border-color:#d8c7f7;background:#faf8ff}

@media (max-width:900px){
.lesson29-flow,.lesson29-rag{grid-template-columns:1fr;gap:8px}
.lesson29-flow>i,.lesson29-rag>i{display:none}
.lesson29-search-flow{grid-template-columns:1fr}
.lesson29-search-flow>i{display:none}
.lesson29-recap-flow{grid-template-columns:1fr;gap:8px}
.lesson29-recap-flow>i{display:none}
}
@media (max-width:760px){
.lesson29-hero h1{font-size:36px}
.lesson29-hero p{font-size:17px}
.lesson29-section{grid-template-columns:30px minmax(0,1fr);gap:10px;margin:32px 0}
.lesson29-number{width:30px;height:30px;font-size:12px}
.lesson29-body h2,.lesson29-practice h2,.lesson29-quiz h2,.lesson29-recap h2{font-size:24px}
.lesson29-meaning-row,.lesson29-compare{grid-template-columns:1fr}
.lesson29-similarity-pill,.lesson29-vs{justify-self:center}
.lesson29-example-grid,.lesson29-warning-grid,.lesson29-usecases,.lesson29-mistakes{grid-template-columns:1fr}
.lesson29-threshold-cards{grid-template-columns:1fr}
.lesson29-bottom-nav{flex-direction:column}
.lesson29-bottom-nav a{max-width:100%}
.lesson29-code pre{font-size:13px}
.lesson29-geometry{height:245px}
.lesson29-vector-a{width:185px}.lesson29-vector-b{width:165px}
}
@media (max-width:480px){
.lesson29-hero h1{font-size:32px}
.lesson29-body p,.lesson29-practice>p{font-size:16px}
.lesson29-callout{grid-template-columns:1fr;gap:3px}
.lesson29-score-row{grid-template-columns:minmax(0,1fr) 44px}
.lesson29-score-row>span{font-size:13px}
.lesson29-codebar{font-size:11px}
.lesson29-code pre{padding:14px;font-size:12px}
.lesson29-formula strong{font-size:17px}
.lesson29-geometry{height:220px}
.lesson29-vector-a{width:145px}.lesson29-vector-b{width:130px}
}


/* Shared code-block toolbar fix — Lessons 24–29 */
.lesson29-code.sah-code { overflow: hidden; }
.lesson29-code .sah-codebar { display:flex; align-items:center; justify-content:space-between; gap:12px; min-height:58px; padding:10px 12px; box-sizing:border-box; background:#f1f3f5; border-bottom:1px solid #dfe3e8; color:#344054; }
.lesson29-code .sah-codebar__language { display:flex; align-items:center; gap:7px; font-size:15px; font-weight:800; line-height:1; white-space:nowrap; flex-shrink:0; }
.lesson29-code .sah-codebar__icon { font-size:13px; font-weight:900; letter-spacing:-.05em; }
.lesson29-code .sah-codebar__title { display:none; }
.lesson29-code .sah-codebar__actions { display:flex; align-items:center; gap:8px; margin-left:auto; flex-shrink:0; }
.lesson29-code .sah-codebar__button { appearance:none; border:1px solid #cbd3dc; border-radius:8px; background:#fff; color:#344054; min-height:36px; padding:0 12px; font:700 13px/1 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif; cursor:pointer; box-shadow:0 1px 1px rgba(16,24,40,.03); transition:background .15s,border-color .15s,transform .05s; white-space:nowrap; text-decoration:none; }
.lesson29-code .sah-codebar__button:hover { background:#f8fafc; border-color:#98a2b3; }
.lesson29-code .sah-codebar__button:active { transform:translateY(1px); }
.lesson29-code .sah-codebar__button.is-copied { background:#f0fdf4; border-color:#86efac; color:#166534; }
.lesson29-code pre { margin:0; background:#f8fafc; color:#344054; border:0; border-radius:0; overflow:auto; -webkit-overflow-scrolling:touch; white-space:pre; tab-size:4; font:14px/1.65 ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace; }
@media (max-width:600px) { .lesson29-code .sah-codebar { min-height:54px; padding:8px 9px; gap:8px; } .lesson29-code .sah-codebar__language { font-size:14px; } .lesson29-code .sah-codebar__button { min-height:34px; padding:0 9px; font-size:12px; } .lesson29-code .sah-codebar__actions { gap:6px; } .lesson29-code pre { padding:14px; font-size:13px; line-height:1.6; } }
@media (max-width:400px) { .lesson29-code .sah-codebar__button { padding:0 8px; font-size:11px; } }