/* RHM editorial perspective: static content first, one optional client-side interaction. */
.rhf{--rhf-ink:#132b31;--rhf-muted:#43616a;--rhf-accent:#0b5963;--rhf-line:#d6e3e0;--rhf-cloud:#f4f8f6;color:var(--rhf-ink);background:#fff}
.rhf *, .rhf *::before, .rhf *::after{box-sizing:border-box}
.rhf .rhf-wrap{width:min(calc(100% - 80px),1120px);margin-inline:auto}
.rhf a{overflow-wrap:anywhere}
.rhf .rhf-eyebrow{font-size:11px;font-weight:750;letter-spacing:.16em;text-transform:uppercase;color:var(--rhf-accent)}
.rhf .rhf-hero{position:relative;background:#eef5f2;overflow:hidden;padding:clamp(54px,6.8vw,92px) 0 clamp(65px,8vw,116px)}
.rhf .rhf-hero::after{content:"";position:absolute;z-index:0;width:36vw;height:36vw;max-width:620px;max-height:620px;border:1px solid #c9dbd6;border-radius:50%;right:-14%;top:13%;opacity:.48;pointer-events:none}
.rhf .rhf-hero::before{content:"";position:absolute;z-index:0;width:48vw;height:48vw;max-width:790px;max-height:790px;border:1px solid #c9dbd6;border-radius:50%;right:-24%;top:-20%;opacity:.48;pointer-events:none}
.rhf .rhf-hero .rhf-wrap{position:relative;z-index:1}
.rhf .rhf-breadcrumb{display:flex;align-items:center;gap:11px;font-size:13px;color:#3f5e64;margin-bottom:clamp(55px,7vw,100px)}
.rhf .rhf-breadcrumb a{color:#245960;text-decoration:underline;text-underline-offset:4px}
.rhf .rhf-hero-text{max-width:850px}
.rhf .rhf-hero h1{font-family:Georgia,'Times New Roman',serif;font-size:clamp(46px,6.2vw,84px);line-height:1.07;letter-spacing:-.052em;font-weight:400;color:var(--rhf-ink);margin:20px 0 29px;text-wrap:balance}
.rhf .rhf-hero p{color:#36545c;font-size:clamp(17px,1.7vw,22px);line-height:1.57;max-width:770px;margin:0 0 15px}
.rhf .rhf-hero p strong{color:var(--rhf-ink);font-weight:670}
.rhf .rhf-hero-actions{display:flex;align-items:center;gap:25px;flex-wrap:wrap;margin-top:34px}
.rhf .rhf-button{display:inline-flex;align-items:center;justify-content:center;gap:26px;padding:16px 22px;border-radius:7px;background:var(--rhf-accent);color:#fff!important;font-size:15px;font-weight:690;text-decoration:none;min-height:52px;transition:background .18s ease,transform .18s ease}
.rhf .rhf-button:hover{background:#084950;transform:translateY(-2px)}
.rhf .rhf-button:focus-visible,.rhf a:focus-visible,.rhf button:focus-visible{outline:3px solid #a77e28;outline-offset:3px}
.rhf .rhf-quiet-link{font-size:14px;color:#175d66;text-decoration:underline;text-underline-offset:5px;font-weight:650}
.rhf .rhf-hero-line{position:absolute;bottom:0;left:0;width:100%;height:4px;background:linear-gradient(90deg,#0b5963 0%,#7bb0a8 44%,#e3efec 100%)}
.rhf .rhf-discover{padding:clamp(72px,8.5vw,118px) 0 98px}
.rhf .rhf-section-heading{max-width:790px;margin-bottom:37px}
.rhf h2{font-family:Georgia,'Times New Roman',serif;font-weight:400;letter-spacing:-.048em;line-height:1.16;font-size:clamp(33px,4.5vw,57px);margin:14px 0 20px;color:var(--rhf-ink);text-wrap:balance}
.rhf .rhf-section-heading p{font-size:18px;line-height:1.65;color:var(--rhf-muted);margin:0}
.rhf .rhf-tabs{display:none;grid-template-columns:repeat(4,minmax(0,1fr));gap:13px;margin-bottom:15px}
.rhf .rhf-tabs.rhf-ready{display:grid}
.rhf .rhf-discovery-panel + .rhf-discovery-panel{margin-top:16px}
.rhf .rhf-perspective{appearance:none;border:1px solid var(--rhf-line);background:#fff;text-align:left;border-radius:12px;padding:24px 20px 22px;display:flex;flex-direction:column;align-items:flex-start;justify-content:flex-start;gap:11px;min-height:190px;cursor:pointer;color:var(--rhf-ink);font:inherit;box-shadow:none;transition:border-color .2s,background .2s,transform .2s}
.rhf .rhf-perspective:hover{border-color:#639b9d;transform:translateY(-2px)}
.rhf .rhf-perspective[aria-selected="true"]{border:2px solid var(--rhf-accent);background:#ecf5f2;padding:23px 19px 21px}
.rhf .rhf-icon{display:inline-flex;width:36px;height:36px;color:#0b5963}
.rhf .rhf-icon svg{width:100%;height:100%}
.rhf .rhf-tab-number{color:#61777b;letter-spacing:.1em;font-size:10px;font-weight:670}
.rhf .rhf-tab-label{font-size:clamp(15px,1.55vw,19px);line-height:1.25;font-weight:660;letter-spacing:-.02em}
.rhf .rhf-panel-shell{padding:0}
.rhf .rhf-discovery-panel{background:#f2f7f5;border:1px solid #dce7e3;border-radius:13px;padding:clamp(27px,5vw,56px);min-height:335px}
.rhf .rhf-discovery-panel[hidden]{display:none!important}
.rhf .rhf-discovery-panel h3{font-family:Georgia,'Times New Roman',serif;font-weight:400;font-size:clamp(27px,3.25vw,43px);line-height:1.17;letter-spacing:-.04em;max-width:800px;margin:14px 0 23px}
.rhf .rhf-discovery-panel p{font-size:clamp(16px,1.45vw,18px);line-height:1.72;color:#3e5860;max-width:930px;margin:0 0 13px}
.rhf .rhf-discovery-panel p strong{color:var(--rhf-ink);font-weight:675}
.rhf .rhf-text-link{font-size:15px;font-weight:670;color:#0b5963;text-underline-offset:5px;text-decoration:underline;display:inline-block;margin-top:14px}
.rhf .rhf-quotation{background:var(--rhf-ink);color:white;padding:clamp(65px,7vw,105px) 0}
.rhf .rhf-quotation-layout{display:grid;grid-template-columns:200px minmax(0,1fr);gap:45px}
.rhf .rhf-quotation .rhf-eyebrow{color:#b2d9d2}
.rhf .rhf-quote-mark{font-family:Georgia,serif;font-size:118px;color:#82b3a8;line-height:1;display:block;margin-top:30px}
.rhf .rhf-quotation blockquote{font-family:Georgia,'Times New Roman',serif;font-size:clamp(27px,3.45vw,48px);letter-spacing:-.036em;line-height:1.25;margin:0 0 24px;color:#fff;font-weight:400}
.rhf .rhf-quotation p{font-size:17px;line-height:1.68;color:#b9cdce;max-width:740px;margin:0}
.rhf .rhf-scene,.rhf .rhf-other{padding:clamp(75px,8vw,110px) 0}
.rhf .rhf-scene-layout,.rhf .rhf-other-layout{display:grid;grid-template-columns:.9fr 1.1fr;gap:clamp(30px,7.5vw,100px);align-items:start}
.rhf .rhf-scene p,.rhf .rhf-other p{font-size:clamp(17px,1.5vw,19px);line-height:1.77;color:#3f5960;margin:0 0 18px}
.rhf .rhf-scene-prose{padding-top:7px}
.rhf .rhf-scene-prose a{color:#0b5963;text-underline-offset:4px;font-weight:640}
.rhf .rhf-scene-links{display:flex;flex-direction:column;align-items:flex-start;gap:10px;margin-top:12px}
.rhf .rhf-evidence{background:#f6f9f8;padding:clamp(75px,8vw,118px) 0}
.rhf .rhf-source-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.rhf .rhf-source{background:#fff;border:1px solid var(--rhf-line);border-radius:12px;padding:clamp(25px,3.4vw,40px);display:flex;flex-direction:column;align-items:flex-start;min-height:288px}
.rhf .rhf-source h3{font-size:clamp(22px,2.25vw,29px);line-height:1.22;letter-spacing:-.035em;font-weight:660;color:var(--rhf-ink);margin:15px 0 17px}
.rhf .rhf-source p{font-size:16px;line-height:1.69;color:#48616a;margin:0 0 18px}
.rhf .rhf-source a{margin-top:auto;color:#0b5963;font-weight:690;text-decoration:underline;text-underline-offset:4px;font-size:14px}
.rhf .rhf-sector-links{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}
.rhf .rhf-sector-links a{padding:12px 17px;border:1px solid #d4e5e0;border-radius:9px;color:#0b5963;text-decoration:none;font-size:14px;font-weight:670;background:#f7faf9}
.rhf .rhf-sector-links a:hover{background:#e8f3ef}
.rhf .rhf-book{background:#0b5963;color:white;padding:clamp(70px,7.8vw,114px) 0}
.rhf .rhf-book .rhf-eyebrow{color:#b6dad5}
.rhf .rhf-book h2{color:#fff;max-width:510px}
.rhf .rhf-book-layout{display:grid;grid-template-columns:1fr 1fr;gap:clamp(35px,7.5vw,95px);align-items:center}
.rhf .rhf-book p{font-size:19px;line-height:1.75;color:#e0eeeb;margin:0 0 26px}
.rhf .rhf-button-light{background:#fff!important;color:#0b5963!important}
.rhf .rhf-button-light:hover{background:#eaf2ee!important}
.rhf .rhf-back{padding:28px 0 40px}
.rhf .rhf-back a{color:#0b5963;font-weight:690;font-size:14px}
.rhf-learn-bridge{background:#edf5f2;padding:clamp(36px,5vw,67px) 0}
.rhf-learn-bridge-layout{display:flex;gap:35px;justify-content:space-between;align-items:center}
.rhf-learn-bridge h2{font-family:Georgia,'Times New Roman',serif;font-weight:400;font-size:clamp(26px,3vw,39px);color:#162d32;line-height:1.18;letter-spacing:-.042em;margin:10px 0 13px}
.rhf-learn-bridge p{font-size:16px;line-height:1.6;color:#456068;max-width:720px;margin:0}
.rhf-learn-bridge .rh-purchase-button{flex-shrink:0;text-align:center}
@media(max-width:960px){.rhf .rhf-tabs{grid-template-columns:repeat(2,minmax(0,1fr))}.rhf .rhf-perspective{min-height:159px}.rhf .rhf-quotation-layout{grid-template-columns:1fr;gap:12px}.rhf .rhf-quote-mark{display:none}.rhf .rhf-book-layout{grid-template-columns:1fr;gap:14px}.rhf-learn-bridge-layout{align-items:flex-start;flex-direction:column;gap:17px}}
@media(max-width:660px){.rhf .rhf-wrap{width:min(calc(100% - 36px),1120px)}.rhf .rhf-hero{padding:40px 0 66px}.rhf .rhf-breadcrumb{margin-bottom:47px}.rhf .rhf-hero h1{font-size:clamp(41px,9vw,55px)}.rhf .rhf-hero p{font-size:17px}.rhf .rhf-hero-actions{align-items:flex-start;gap:21px;flex-direction:column}.rhf .rhf-discover{padding:65px 0}.rhf .rhf-tabs{gap:9px}.rhf .rhf-perspective{min-height:155px;padding:17px 13px 14px;gap:8px}.rhf .rhf-perspective[aria-selected="true"]{padding:16px 12px 13px}.rhf .rhf-icon{height:30px;width:30px}.rhf .rhf-tab-label{font-size:15px}.rhf .rhf-discovery-panel{padding:27px 20px;min-height:0}.rhf .rhf-discovery-panel h3{font-size:28px}.rhf .rhf-quotation{padding:61px 0}.rhf .rhf-scene-layout,.rhf .rhf-other-layout{grid-template-columns:1fr;gap:13px}.rhf .rhf-source-grid{grid-template-columns:1fr}.rhf .rhf-source{min-height:0}.rhf .rhf-book p{font-size:17px}.rhf-learn-bridge-layout{width:min(calc(100% - 36px),1120px)!important}}
@media(prefers-reduced-motion:reduce){.rhf .rhf-perspective,.rhf .rhf-button{transition:none}}

/* V23.8.5 editorial depth: readable knowledge, unchanged interactive mechanism. */
.rhf-deep .rhf-lede{max-width:920px;font-size:clamp(17px,1.55vw,20px);line-height:1.75;color:#3f5960;margin:0 0 35px}
.rhf-deep .rhf-discovery-panel p{max-width:950px}
.rhf-deep .rhf-discovery-panel p a{color:#0b5963;text-decoration:underline;text-underline-offset:4px}
.rhf-deep .rhf-discovery-panel{min-height:0}
.rhf-deep .rhf-core,.rhf-deep .rhf-relations,.rhf-deep .rhf-cases,.rhf-deep .rhf-learning,.rhf-deep .rhf-faq{padding:clamp(72px,8vw,115px) 0}
.rhf-deep .rhf-signals{background:#f4f8f6;padding:clamp(72px,8vw,115px) 0}
.rhf-deep .rhf-method-intro{display:grid;grid-template-columns:1fr 1fr;gap:clamp(25px,7vw,92px);align-items:start;margin-bottom:28px}
.rhf-deep .rhf-method-intro h2{margin-top:14px}
.rhf-deep .rhf-method-lead p{font-size:18px;line-height:1.8;color:#3e5961;margin:0 0 19px}
.rhf-deep .rhf-core a,.rhf-deep .rhf-signals a,.rhf-deep .rhf-relations a,.rhf-deep .rhf-case a,.rhf-deep .rhf-faq a{color:#0b5963;text-underline-offset:4px}
.rhf-deep .rhf-engine-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.rhf-deep .rhf-engine{border:1px solid #dbe9e6;background:#f7faf9;border-radius:14px;padding:clamp(24px,3.4vw,43px)}
.rhf-deep .rhf-engine-social{background:#e6f1ed}
.rhf-deep .rhf-engine h3{font-family:Georgia,serif;font-size:clamp(25px,2.5vw,34px);font-weight:400;letter-spacing:-.035em;line-height:1.23;margin:16px 0}
.rhf-deep .rhf-engine p{font-size:17px;line-height:1.7;color:#3b5860;margin:0 0 22px}
.rhf-deep .rhf-engine a{font-weight:680;font-size:15px}
.rhf-deep .rhf-method-conclusion{margin-top:26px;border-left:3px solid #0b5963;padding:14px 0 11px clamp(20px,3vw,38px);max-width:930px}
.rhf-deep .rhf-method-conclusion p{font-size:clamp(18px,1.7vw,21px);line-height:1.7;color:#344f58;margin:14px 0 12px}
.rhf-deep .rhf-signal-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.rhf-deep .rhf-signal-grid article{background:#fff;border:1px solid #dae5e2;border-radius:12px;padding:28px 25px}
.rhf-deep .rhf-signal-tag,.rhf-deep .rhf-concept-number{color:#0b5963;font-size:12px;font-weight:750;letter-spacing:.105em}
.rhf-deep .rhf-signal-grid h3{font-size:clamp(21px,2.1vw,28px);line-height:1.23;margin:17px 0 14px;letter-spacing:-.03em;color:#183037}
.rhf-deep .rhf-signal-grid p{font-size:16px;line-height:1.72;color:#415d65;margin:0}
.rhf-deep .rhf-signals-close{margin:28px 0 0;max-width:940px;font-size:18px;line-height:1.75;color:#3c565e}
.rhf-deep .rhf-concept-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:13px}
.rhf-deep .rhf-concept-grid article{padding:27px 24px 23px;border:1px solid #dfebe8;border-radius:12px;background:#f7faf9}
.rhf-deep .rhf-concept-grid h3{font-size:clamp(19px,1.9vw,25px);line-height:1.22;margin:17px 0 13px;letter-spacing:-.03em}
.rhf-deep .rhf-concept-grid h3 a{text-decoration:none;border-bottom:1px solid #649d9c}
.rhf-deep .rhf-concept-grid p{font-size:16px;line-height:1.67;color:#445e65;margin:0}
.rhf-deep .rhf-cases{background:#f8faf9}
.rhf-deep .rhf-case-list{border-top:1px solid #d8e3df}
.rhf-deep .rhf-case{display:grid;grid-template-columns:.83fr 1.17fr;gap:clamp(28px,6vw,80px);padding:34px 0;border-bottom:1px solid #d8e3df}
.rhf-deep .rhf-case h3{font-family:Georgia,serif;font-size:clamp(26px,2.9vw,38px);font-weight:400;letter-spacing:-.035em;line-height:1.2;margin:14px 0}
.rhf-deep .rhf-case .rhf-case-metric{font-size:15px;line-height:1.62;font-weight:630;color:#4e7176;margin:0}
.rhf-deep .rhf-case div:nth-child(2) p{font-size:17px;line-height:1.77;color:#3b5760;margin:0 0 18px}
.rhf-deep .rhf-case a{font-size:15px;font-weight:700;text-decoration:underline}
.rhf-deep .rhf-source{min-height:0}
.rhf-deep .rhf-source h3{font-size:clamp(20px,2vw,27px)}
.rhf-deep .rhf-reading-map{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:11px}
.rhf-deep .rhf-reading-map article{border-top:3px solid #0b5963;background:#f2f7f5;padding:22px 17px}
.rhf-deep .rhf-reading-map span{color:#0b5963;font-size:11px;font-weight:750;letter-spacing:.09em}
.rhf-deep .rhf-reading-map h3{font-size:18px;line-height:1.32;margin:17px 0 14px;letter-spacing:-.025em;color:#193138}
.rhf-deep .rhf-reading-map p{font-size:14px;line-height:1.65;color:#435d65;margin:0}
.rhf-deep .rhf-learning-links{display:flex;gap:25px;flex-wrap:wrap;margin-top:28px}
.rhf-deep .rhf-faq{background:#f6f9f8}
.rhf-deep .rhf-faq-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 45px}
.rhf-deep .rhf-faq-grid article{border-top:1px solid #d5e4df;padding:21px 0 28px}
.rhf-deep .rhf-faq-grid h3{font-size:20px;line-height:1.35;color:#183039;letter-spacing:-.025em;margin:0 0 13px}
.rhf-deep .rhf-faq-grid p{font-size:16px;line-height:1.72;color:#415d64;margin:0}
@media(max-width:1000px){.rhf-deep .rhf-concept-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.rhf-deep .rhf-reading-map{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:740px){.rhf-deep .rhf-method-intro,.rhf-deep .rhf-engine-grid,.rhf-deep .rhf-case,.rhf-deep .rhf-faq-grid{grid-template-columns:1fr}.rhf-deep .rhf-signal-grid,.rhf-deep .rhf-concept-grid{grid-template-columns:1fr}.rhf-deep .rhf-reading-map{grid-template-columns:repeat(2,minmax(0,1fr))}.rhf-deep .rhf-method-intro{gap:6px}.rhf-deep .rhf-source-grid{grid-template-columns:1fr}.rhf-deep .rhf-case{gap:10px}.rhf-deep .rhf-faq-grid{gap:0}}
@media(max-width:460px){.rhf-deep .rhf-reading-map{grid-template-columns:1fr}.rhf-deep .rhf-reading-map article{padding:22px}.rhf-deep .rhf-concept-grid article{padding:24px 22px}}