.concept-section{padding:76px 0;background:#fff}.concept-card{position:relative;overflow:hidden;padding:48px;border:1px solid #e0e6f1;border-radius:28px;background:radial-gradient(ellipse at 95% 0%,#e9e5ff,transparent 58%),linear-gradient(125deg,#f7faff,#eef4fc);box-shadow:0 20px 60px #273e6510}.concept-heading{max-width:850px;margin:14px 0 36px;font-size:clamp(25px,3.1vw,39px);line-height:1.5;letter-spacing:-1px;font-weight:750;color:#18243c}.concept-heading em{font-style:normal;color:#386cdb}.concept-slide{display:grid;grid-template-columns:.8fr 1.2fr;gap:48px;align-items:center}.concept-slide[hidden]{display:none}.concept-index{font-size:12px;letter-spacing:2px;color:#6179a4}.concept-slide h3{font-size:26px;margin:14px 0 12px;color:#20304d}.concept-slide p{font-size:15px;line-height:1.9;color:#61718b;margin:0;max-width:350px}.concept-art{width:100%;height:auto;display:block;border-radius:22px;background:#ffffff70;border:1px solid #fff;box-shadow:0 16px 36px #3952820c}.concept-controls{display:flex;align-items:center;gap:10px;margin-top:28px;padding-top:22px;border-top:1px solid #dbe3f1}.concept-selectors{display:flex;gap:6px;margin-right:auto}.concept-controls button{min-height:40px;min-width:40px;border:1px solid #d7e0ef;background:#ffffffa8;border-radius:10px;color:#536580;font:inherit;cursor:pointer;padding:8px 12px}.concept-selectors button[aria-pressed="true"]{color:#fff;background:#366fe2;border-color:#366fe2}.concept-controls button:hover{border-color:#7498dc}.concept-controls button:focus-visible{outline:3px solid #77a1f0;outline-offset:3px}.concept-status{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}@media(max-width:700px){.concept-section{padding:48px 0}.concept-card{padding:26px 20px;border-radius:20px}.concept-heading{margin-bottom:26px}.concept-slide{grid-template-columns:1fr;gap:22px}.concept-slide h3{font-size:22px;margin:9px 0}.concept-slide p{max-width:none}.concept-controls{gap:6px;flex-wrap:wrap}.concept-controls button{padding:7px 10px}.concept-selectors{gap:5px}.concept-art{border-radius:15px}}

/* Small visual dots with generous keyboard and pointer targets. */
.concept-selectors button,.concept-selectors button[aria-pressed="true"]{display:grid;place-items:center;min-width:32px;min-height:40px;padding:0;border:0;background:transparent;border-radius:999px}.concept-selectors button:before{content:"";width:8px;height:8px;border-radius:50%;background:#bdcae1;transition:background .2s,transform .2s}.concept-selectors button[aria-pressed="true"]:before{background:#366fe2;transform:scale(1.25)}.concept-selectors button:hover:before{background:#7295d8}.concept-selectors button[aria-pressed="true"]:hover:before{background:#366fe2}