.lean-tools-hub{max-width:1180px;margin:0 auto;color:#26364c}
.lean-hub-hero{display:block;position:relative;overflow:hidden;padding:54px clamp(24px,5vw,64px);border-radius:16px;background:#102a43;color:#fff}
.lean-hub-hero::after{content:"";position:absolute;width:240px;height:240px;right:-55px;top:-75px;border:34px solid #f47b2a;border-radius:50%;opacity:.95}
.lean-hub-hero>*{position:relative;z-index:1}
.lean-hub-hero .eyebrow{color:#9fc2ff;margin:0 0 18px}
.lean-hub-hero h1{max-width:780px;margin:0 0 18px;color:#fff;font-size:clamp(2.35rem,5vw,4.25rem);line-height:1.04;letter-spacing:-.05em}
.lean-hub-hero>p:not(.eyebrow){max-width:700px;margin:0;color:#e1e9f2;font-size:1.125rem;line-height:1.65}
.lean-hub-principle{display:flex;flex-wrap:wrap;gap:10px;margin-top:30px}
.lean-hub-principle strong{display:block;padding:9px 13px;border:1px solid #ffffff3d;border-radius:999px;background:#ffffff12;font-size:.875rem}
.lean-hub-controls{position:relative;margin:-22px auto 34px;width:min(1040px,calc(100% - 32px));padding:24px;border:1px solid #d8e1eb;border-radius:12px;background:#fff;box-shadow:0 14px 36px #102a4314}
.lean-hub-controls label{display:block;margin-bottom:8px;color:#102a43;font-weight:750}
.lean-hub-controls input{width:100%;min-height:52px;padding:12px 16px;border:1px solid #b8c6d5;border-radius:8px;background:#fff;color:#102a43;font:inherit;font-size:1rem}
.lean-hub-controls input:focus{outline:3px solid #2f6fe4;outline-offset:2px}
.lean-filter-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}
.lean-filter-row button{min-height:42px;padding:8px 12px;border:1px solid #ccd7e2;border-radius:999px;background:#f5f8fb;color:#23405e;font:inherit;font-size:.875rem;font-weight:650;cursor:pointer}
.lean-filter-row button[aria-pressed="true"]{border-color:#1e5fcd;background:#1e5fcd;color:#fff}
#lean-result-count{margin:14px 0 0;color:#5a6878;font-size:.875rem}
.lean-alpha{margin:0 0 44px;border:1px solid #d8e1eb;border-radius:10px;background:#fff}
.lean-alpha summary{min-height:50px;padding:14px 18px;font-weight:750;cursor:pointer}
.lean-alpha nav{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px 20px;padding:4px 18px 20px}
.lean-alpha a{color:#2454b5;text-underline-offset:3px;font-size:.9rem;line-height:1.5}
.lean-concept-groups{display:grid;gap:56px}
.lean-group-heading{display:grid;grid-template-columns:170px 1fr;gap:24px;align-items:end;padding-bottom:14px;border-bottom:1px solid #d8e1eb}
.lean-group-heading p{margin:0;color:#e05f13;font-size:.75rem;font-weight:800;letter-spacing:.09em;text-transform:uppercase}
.lean-group-heading h2{margin:0;color:#102a43;font-size:clamp(1.8rem,3vw,2.4rem);letter-spacing:-.035em}
.lean-concept-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;margin-top:20px}
.lean-concept{scroll-margin-top:24px;display:flex;flex-direction:column;min-width:0;border:1px solid #d8e1eb;border-radius:12px;background:#fff;box-shadow:0 5px 18px #102a4308}
.lean-concept[hidden],.lean-concept-groups>[hidden]{display:none}
.lean-concept header{padding:22px 24px 17px;border-top:4px solid #2668d8;border-bottom:1px solid #e6ecf2;border-radius:12px 12px 0 0}
.lean-concept header p{margin:0 0 6px;color:#637387;font-size:.75rem;font-weight:750;letter-spacing:.06em;text-transform:uppercase}
.lean-concept h2{margin:0;color:#102a43;font-size:1.35rem;line-height:1.25;letter-spacing:-.02em}
.lean-concept-body{display:grid;grid-template-columns:1fr 1fr;gap:0;padding:10px 24px 18px}
.lean-concept-body>div{padding:13px 14px 13px 0;border-bottom:1px solid #edf1f5}
.lean-concept-body>div:nth-child(even){padding-left:14px;padding-right:0;border-left:1px solid #edf1f5}
.lean-concept-body h3{margin:0 0 5px;color:#24415e;font-size:.8rem;letter-spacing:.03em;text-transform:uppercase}
.lean-concept-body p{margin:0;color:#4c5d6f;font-size:.9375rem;line-height:1.58}
.lean-concept-body .lean-watch h3{color:#c65311}
.lean-concept footer{margin-top:auto;padding:0 24px 22px}
.lean-concept footer a{display:inline-flex;align-items:center;gap:8px;min-height:44px;color:#1e5fcd;font-weight:750;text-underline-offset:4px}
.lean-hub-next{display:grid;grid-template-columns:1.5fr .7fr;gap:36px;align-items:center;margin-top:64px;padding:34px;border-radius:12px;background:#edf4ff}
.lean-hub-next h2{margin:.3rem 0 .6rem;color:#102a43;font-size:1.8rem}
.lean-hub-next p{margin:.4rem 0;line-height:1.65}
.lean-hub-next>div:last-child{display:flex;flex-direction:column;align-items:flex-start;gap:12px}
.lean-hub-callout{margin-top:42px;padding:28px;border:1px solid #ccd9e8;border-left:5px solid #f47b2a;border-radius:10px;background:#f7faff}
.lean-hub-callout h2{margin-bottom:.5rem}
@media(max-width:820px){.lean-alpha nav{grid-template-columns:repeat(2,minmax(0,1fr))}.lean-concept-grid{grid-template-columns:1fr}.lean-group-heading{grid-template-columns:1fr;gap:5px}.lean-hub-next{grid-template-columns:1fr}}
@media(max-width:520px){.lean-hub-hero{padding:38px 22px}.lean-hub-hero::after{width:150px;height:150px;border-width:22px}.lean-hub-controls{padding:18px}.lean-alpha nav{grid-template-columns:1fr}.lean-concept-body{grid-template-columns:1fr}.lean-concept-body>div:nth-child(even){padding-left:0;border-left:0}.lean-concept header,.lean-concept footer{padding-left:20px;padding-right:20px}.lean-concept-body{padding-left:20px;padding-right:20px}.lean-hub-next{padding:24px 20px}}
@media(prefers-reduced-motion:reduce){.lean-concept{scroll-behavior:auto}}
@media print{.lean-hub-controls,.lean-alpha{display:none}.lean-concept-grid{display:block}.lean-concept{break-inside:avoid;margin-bottom:16px}.lean-hub-hero{background:#fff;color:#000;border:1px solid #999}.lean-hub-hero h1,.lean-hub-hero>p:not(.eyebrow){color:#000}}