.learn-page{max-width:860px;padding-block:30px 64px;overflow-wrap:anywhere}.learn-breadcrumb ol{display:flex;flex-wrap:wrap;gap:6px 12px;list-style:none;padding:0;color:var(--muted);font-size:13px}.learn-breadcrumb li+li:before{content:'›';margin-right:12px}.learn-header{border-bottom:1px solid var(--line);padding:28px 0;margin-bottom:28px}.learn-eyebrow{font-size:12px;font-weight:700;letter-spacing:.06em;color:var(--blue)}.learn-header h1{font-size:clamp(26px,4vw,38px);line-height:1.5;margin:12px 0 20px}.learn-dates,.learn-byline{font-size:13px;color:var(--muted);line-height:1.8;margin:4px 0}.learn-body{font-size:17px;line-height:1.95}.learn-body p{margin:18px 0}.learn-page h2{font-size:24px;line-height:1.6;margin:44px 0 18px}.learn-page h3{font-size:20px;line-height:1.6;margin:26px 0 12px}.learn-page a{color:var(--blue);text-underline-offset:3px}.learn-body ul,.learn-body ol{padding-left:1.5em}.learn-body li{margin:10px 0}.learn-lead{font-size:19px;font-weight:600}.learn-note{padding:18px 22px;background:var(--pale,#f4f7fa);border-left:4px solid var(--blue)}.learn-note p{margin:8px 0 0}.learn-table{max-width:100%;margin:24px 0}.learn-table table{border-collapse:collapse;width:100%;table-layout:fixed;font-size:16px;line-height:1.75}.learn-table caption{text-align:left;font-weight:700;margin-bottom:10px}.learn-table th,.learn-table td{border:1px solid var(--line);padding:12px;text-align:left;vertical-align:top;overflow-wrap:anywhere}.learn-table th{background:var(--pale,#f4f7fa)}.learn-table th:first-child{width:32%}.learn-body .learn-cta{display:inline-block;padding:14px 20px;border-radius:7px;background:var(--blue);color:white;font-weight:700;text-decoration:none;line-height:1.7}.learn-links{display:grid;gap:18px}.learn-links a{border:1px solid var(--line);padding:20px;border-radius:8px;text-decoration:none}.learn-links span{display:block;color:var(--muted);margin-top:8px;line-height:1.8}.learn-return{margin-top:40px}@media(max-width:600px){.learn-page{padding-block:20px 45px}.learn-header{padding-top:18px}.learn-body{font-size:16px}.learn-lead{font-size:18px}.learn-page h2{font-size:22px;margin-top:34px}.learn-table th,.learn-table td{padding:9px;font-size:14px}.learn-note{padding:14px 16px}.learn-body .learn-cta{display:block;text-align:center}}
.learn-diagram{margin:24px 0;padding:20px;border:1px solid var(--line);border-radius:10px;background:white}.learn-diagram figcaption{font-weight:700;font-size:20px;color:var(--navy);line-height:1.6;margin-bottom:20px}.learn-diagram-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.learn-diagram-grid>div{min-width:0;text-align:center;background:var(--pale,#f4f7fa);padding:14px 8px;border-radius:6px}.learn-diagram-grid strong{font-size:16px;line-height:1.6;display:block}.learn-diagram svg{display:block;width:100%;height:auto;color:var(--blue);font-family:inherit}.learn-diagram svg text{fill:var(--navy);font-size:16px;font-weight:600}.learn-diagram .tube,.learn-diagram .label{fill:white;stroke:var(--blue);stroke-width:2}.learn-diagram .base{fill:var(--line);stroke:var(--muted);stroke-width:1.5}.learn-diagram .line,.learn-diagram .print{fill:none;stroke:var(--navy);stroke-width:2}.learn-diagram .arrow{fill:none;stroke:var(--blue);stroke-width:2.5;stroke-linecap:round;stroke-linejoin:round}.learn-diagram .ring{fill:none;stroke:var(--blue);stroke-width:14}.learn-diagram .fold{fill:none;stroke:var(--blue);stroke-width:16;stroke-linejoin:round}.learn-diagram .learn-diagram-note{font-size:14px;color:var(--muted);line-height:1.8;margin:16px 0 0}.learn-diagram-pair{grid-template-columns:repeat(2,minmax(0,1fr))}.learn-diagram-pair p{font-size:14px;line-height:1.7;margin:0}.learn-related{border-top:1px solid var(--line);margin-top:32px}.learn-related span{font-size:14px;color:var(--muted)}@media(max-width:600px){.learn-diagram{padding:16px}.learn-diagram-grid{grid-template-columns:1fr}.learn-diagram svg{max-width:290px;margin-inline:auto}.learn-diagram figcaption{font-size:18px}.learn-diagram-grid>div{padding:14px 10px}}
.learn-check-steps>li{margin-block:22px}.learn-check-steps>li>p{margin:6px 0 0}.learn-body .learn-source-note{font-size:15px;line-height:1.85;color:var(--muted)}.learn-body .learn-source-note a,.learn-source-list a{color:var(--muted);text-decoration:underline;text-underline-offset:3px}.learn-source-list{font-size:16px;line-height:1.85}
.learn-timeline .learn-timeline-steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:28px;list-style:none;padding:0;margin:0}.learn-timeline-steps>li{position:relative;min-width:0;margin:0;padding:16px 12px;border:1px solid var(--line);border-top:4px solid var(--blue);border-radius:6px;text-align:center;color:var(--navy);line-height:1.7}.learn-timeline-steps strong{display:block;color:var(--blue);font-size:21px;margin-bottom:8px}.learn-timeline-steps span{display:block;font-size:16px}.learn-timeline-steps>li+li:before{content:'';position:absolute;left:-22px;top:50%;width:10px;height:10px;border-top:2px solid var(--blue);border-right:2px solid var(--blue);transform:rotate(45deg)}@media(max-width:600px){.learn-timeline .learn-timeline-steps{grid-template-columns:1fr;gap:26px}.learn-timeline-steps>li+li:before{left:calc(50% - 5px);top:-21px;transform:rotate(135deg)}}
.learn-glow svg{max-width:600px;margin-inline:auto}.learn-glow svg text{font-size:26px}.learn-method-flow .learn-method-question{padding:14px;border-radius:6px;background:var(--blue);color:white;text-align:center;margin:0 0 30px}.learn-method-branches{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.learn-method-branches section{min-width:0;position:relative;padding:16px;border:1px solid var(--line);border-radius:6px}.learn-method-branches section:before,.learn-method-branches li:before{content:'';position:absolute;width:9px;height:9px;border-right:2px solid var(--blue);border-bottom:2px solid var(--blue);transform:rotate(45deg);left:calc(50% - 5px);top:-23px}.learn-method-branches h3{font-size:19px;color:var(--blue);text-align:center;margin:0 0 28px}.learn-method-branches ol{list-style:none;padding:0;margin:0}.learn-method-branches li{position:relative;margin:26px 0 0;padding:14px 10px;background:var(--pale,#f4f7fa);border-radius:5px;text-align:center;line-height:1.8;font-size:16px;color:var(--navy)}.learn-method-branches li:before{top:-20px}@media(max-width:600px){.learn-method-branches{grid-template-columns:1fr;gap:30px}.learn-method-branches section{padding:14px}.learn-glow svg text{font-size:28px}}
@media(max-width:600px){.learn-method-branches section+section:before{display:none}}
.learn-method-definitions{display:grid;grid-template-columns:max-content 1fr;gap:8px 16px;margin:20px 0 0;font-size:14px;line-height:1.8;color:var(--muted)}.learn-method-definitions dt{font-weight:700}.learn-method-definitions dd{margin:0}#methods+p+p+.learn-table{overflow-x:auto}#methods+p+p+.learn-table table{min-width:720px}#methods+p+p+.learn-table th:first-child{width:18%}#methods+p+p+.learn-table th:nth-child(2){width:12%}#methods+p+p+.learn-table th:nth-child(3){width:42%}#methods+p+p+.learn-table th:nth-child(4){width:28%}@media(max-width:600px){.learn-method-definitions{grid-template-columns:1fr;gap:4px}.learn-method-definitions dd+dt{margin-top:8px}}
.learn-label-clues{margin:12px 0 0;text-align:left;font-size:14px;line-height:1.8}.learn-label-clues dt{font-weight:700;border-top:1px solid var(--line);padding-top:10px}.learn-label-clues dd{margin:3px 0 12px}.learn-label-clues dd:last-child{margin-bottom:0}



/* Post 40 visual guide: every selector is scoped to br40 components. */
.br40-quick,.br40-methods,.br40-flow,.br40-glow,.br40-age{box-sizing:border-box;color:#18344c}
.br40-quick *,.br40-methods *,.br40-flow *,.br40-glow *,.br40-age *{box-sizing:border-box}
.br40-section-kicker{display:block;margin:0 0 1rem;color:#183b61;font-size:.82rem;font-weight:800;letter-spacing:.08em}
.br40-quick{margin:1.4rem 0 1.8rem;padding:1.25rem;border-radius:20px;background:#eaf3f9;border:1px solid #cbdfe9}
.br40-quick>strong{display:block;margin:0 0 1rem;font-size:1.12rem;color:#122e4e}
.br40-quick-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:.65rem}
.br40-quick-card{--accent:#246da9;--wash:#eef7ff;min-width:0;min-height:166px;padding:.9rem;border-radius:15px;border-top:6px solid var(--accent);background:var(--wash);box-shadow:0 3px 12px #173c5b12}
.br40-quick-card.is-orange{--accent:#ba621a;--wash:#fff2e5}.br40-quick-card.is-navy{--accent:#16395b;--wash:#e9eff7}.br40-quick-card.is-red{--accent:#bc3941;--wash:#fff0f0}
.br40-quick-icon{display:grid;place-items:center;width:39px;height:39px;margin-bottom:.55rem;border-radius:50%;background:var(--accent);color:#fff;font-size:1.3rem;font-weight:900;line-height:1}
.br40-quick-card b{display:block;color:var(--accent);font-size:1.04rem;line-height:1.35}.br40-quick-card span:last-child{display:block;margin-top:.45rem;font-size:.91rem;line-height:1.5;font-weight:650}
.br40-methods{margin:1.2rem 0 1.5rem;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:.8rem}
.br40-method{--accent:#226da9;--wash:#edf7ff;position:relative;min-width:0;padding:1.1rem 1rem 1.15rem;border:1px solid #cbdce7;border-bottom:5px solid var(--accent);border-radius:18px;background:var(--wash)}
.br40-method.is-orange{--accent:#ad5f1b;--wash:#fff3e8}.br40-method.is-navy{--accent:#193f67;--wash:#edf1f8}
.br40-method-name{display:block;font-weight:850;color:var(--accent);font-size:1.17rem;line-height:1.35}.br40-method-signal{display:flex;align-items:center;gap:.5rem;margin:.75rem 0;font-weight:800;color:#18344c}.br40-method-signal i{display:grid;place-items:center;flex:none;width:34px;height:34px;border-radius:50%;background:var(--accent);color:#fff;font-style:normal;font-size:1.25rem}.br40-method p{margin:0;font-size:.94rem;line-height:1.6}
.br40-flow{margin:1.6rem 0;padding:1.3rem 1.2rem 1.5rem;border-radius:22px;background:#eff5fa;border:1px solid #c7d9e7}
.br40-flow-title{margin:0 0 1.25rem;font-size:1.16rem;font-weight:850;color:#153b5c}
.br40-flow-question{position:relative;width:min(100%,430px);margin:0 auto;padding:.9rem 1rem;text-align:center;color:#fff;background:#183b61;border-radius:13px;font-weight:850;box-shadow:0 5px 12px #153b5c26}
.br40-flow-question:after{content:"";position:absolute;left:50%;bottom:-24px;width:3px;height:24px;background:#87a6be}
.br40-fork{height:26px;width:56%;margin:24px auto 0;border-top:3px solid #87a6be;position:relative}
.br40-fork:before,.br40-fork:after{content:"";position:absolute;top:0;width:3px;height:26px;background:#87a6be}.br40-fork:before{left:0}.br40-fork:after{right:0}
.br40-flow-lanes{display:grid;grid-template-columns:1fr 1fr;gap:1rem;align-items:start}
.br40-lane{--accent:#226da9;--wash:#ecf6ff;min-width:0;border:2px solid var(--accent);border-radius:16px;background:var(--wash);padding:.8rem;box-shadow:0 4px 14px #123a5c10}
.br40-lane.is-orange{--accent:#ba621a;--wash:#fff2e7}
.br40-lane-label{display:inline-block;margin:0 0 .7rem;padding:.27rem .8rem;border-radius:999px;color:#fff;background:var(--accent);font-weight:850;font-size:.91rem}
.br40-flow-step{padding:.7rem .8rem;background:#fff;border:1px solid #cbdde8;border-radius:11px;line-height:1.55;font-weight:700;min-height:58px}
.br40-flow-step b{display:block;color:var(--accent)}.br40-flow-step.is-end{border-color:var(--accent);background:var(--wash)}
.br40-flow-arrow{height:30px;margin:auto;text-align:center;color:var(--accent);font-weight:900;font-size:1.32rem;line-height:30px}.br40-flow-arrow:before{content:"↓"}
.br40-flow-note{margin:1rem 0 0;font-size:.91rem;line-height:1.65;color:#3d5365}
.br40-glow{margin:1.3rem 0 1.6rem;padding:1.1rem;border-radius:20px;background:linear-gradient(145deg,#e9f4fb,#f6faff);border:1px solid #bfd8e7}
.br40-glow-label{display:flex;align-items:center;gap:.45rem;color:#153b5c;font-weight:800;font-size:.96rem}
.br40-glow-label:before{content:"";width:11px;height:11px;border-radius:50%;background:#226da9}
.br40-glow-housing{position:relative;min-height:150px;margin:.45rem 0 .9rem;border-radius:14px;border:4px solid #244767;background:#dbeaf2;box-shadow:inset 0 8px 16px #173e5a1d}
.br40-glow-tube{position:absolute;left:8%;right:8%;top:31%;height:35px;border-radius:999px;background:linear-gradient(180deg,#fff,#defaff 55%,#a9dbe9);box-shadow:0 0 0 5px #b4d8e6,0 0 22px #91d8ef}
.br40-glow-tube:before,.br40-glow-tube:after{content:"";position:absolute;top:4px;width:10px;height:27px;background:#657f92}.br40-glow-tube:before{left:-7px}.br40-glow-tube:after{right:-7px}
.br40-glow-bulb{position:absolute;left:64%;top:73%;width:29px;height:29px;border-radius:50%;background:#e8782a;border:4px solid #fff;box-shadow:0 0 0 3px #b75718,0 0 12px #e8782a}
.br40-glow-keys{display:flex;flex-wrap:wrap;gap:.5rem}.br40-glow-key{display:flex;align-items:center;gap:.4rem;padding:.3rem .6rem;border-radius:999px;background:#fff;border:1px solid #bdd4e1;font-size:.9rem;font-weight:750}.br40-glow-key i{display:inline-block;width:10px;height:10px;border-radius:50%;background:#226da9}.br40-glow-key.is-lamp i{background:#9bdbea}.br40-glow-key.is-bulb i{background:#e8782a}.br40-glow figcaption{margin-top:.75rem;color:#506477;font-size:.88rem;line-height:1.55}
.br40-age{margin:1.5rem 0;padding:1.25rem;border-radius:20px;background:#eef5fa;border:1px solid #c7dce9}
.br40-age-heading{margin:0 0 .8rem;color:#153b5c;font-size:1.13rem;font-weight:850}.br40-age-sub{margin:0 0 1rem;font-size:.92rem;color:#4d6071}
.br40-timeline{position:relative;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:.75rem;padding-top:2.1rem}
.br40-timeline:before{content:"";position:absolute;top:14px;left:14%;right:14%;height:5px;border-radius:999px;background:linear-gradient(90deg,#2b78ae 0 33%,#cf7921 33% 68%,#c7424a 68%)}
.br40-time{--accent:#2575a8;--wash:#eaf6ff;position:relative;min-width:0;padding:.9rem;border-radius:13px;background:var(--wash);border:2px solid var(--accent)}
.br40-time.is-orange{--accent:#c46a1c;--wash:#fff1e2}.br40-time.is-red{--accent:#c13e48;--wash:#fff0f1}
.br40-time:before{content:"";position:absolute;top:-29px;left:50%;width:16px;height:16px;transform:translateX(-50%);border-radius:50%;background:var(--accent);border:3px solid #fff;box-shadow:0 0 0 3px var(--accent)}
.br40-time b{display:block;color:var(--accent);font-size:1.05rem;line-height:1.4}.br40-time span{display:block;margin-top:.4rem;font-size:.92rem;font-weight:700;line-height:1.5}
.br40-age-unknown{margin:1rem 0 0;padding:.65rem .85rem;border-radius:10px;background:#fff;border-left:4px solid #627a8c;font-size:.92rem;line-height:1.55}
.br40-official{margin-top:1.2rem;padding:1rem;border-radius:13px;background:#fff;border:1px solid #c4d7e2}.br40-official>strong{display:block;color:#183b61;margin-bottom:.55rem}.br40-official-list{display:grid;grid-template-columns:1fr 1fr;gap:.55rem}.br40-official-item{border-left:4px solid #193f67;padding:.35rem .6rem;background:#f2f6fa;font-size:.9rem;line-height:1.5}.br40-official-item b{display:block;color:#193f67;font-size:1.07rem}
.br40-related{display:grid;grid-template-columns:1fr;gap:.55rem}.br40-related a{display:block;border:1px solid #d1e2e9;border-radius:10px;padding:.7rem .9rem;background:#f7fbfd;font-weight:700}
@media(max-width:850px){.br40-quick-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.br40-methods{grid-template-columns:1fr}}
@media(max-width:600px){.br40-quick,.br40-flow,.br40-age{padding:.95rem}.br40-quick-card{min-height:0;padding:.8rem}.br40-quick-card b{font-size:.98rem}.br40-quick-card span:last-child{font-size:.87rem}.br40-flow-question{font-size:1rem}.br40-fork{display:none}.br40-flow-question:after{display:block;bottom:-20px;height:20px}.br40-flow-lanes{position:relative;grid-template-columns:1fr;gap:1rem;margin-top:1.25rem;padding-left:1.15rem}.br40-flow-lanes:before{content:"";position:absolute;left:.3rem;top:1.65rem;bottom:1.65rem;width:3px;background:#87a6be}.br40-lane{position:relative;padding-left:1rem}.br40-lane:before{content:"";position:absolute;left:-1.05rem;top:1.65rem;width:1.05rem;height:3px;background:#87a6be}.br40-timeline{display:block;padding:0 0 0 1.45rem}.br40-timeline:before{top:8px;bottom:8px;left:.35rem;width:5px;height:auto;background:linear-gradient(#2b78ae,#cf7921 55%,#c7424a)}.br40-time{margin-bottom:.75rem}.br40-time:before{top:50%;left:-1.12rem;transform:translateY(-50%)}.br40-official-list{grid-template-columns:1fr}}

/* Post 39: model-number guide. Keep every selector scoped to this article. */
body.postid-39 .learn-header h1{font-size:clamp(26px,3.3vw,34px);line-height:1.45;text-wrap:balance}
.br39-mobile-break{display:none}
body.postid-39 .learn-body .br39-first,body.postid-39 .learn-body .br39-compare,body.postid-39 .learn-body .br39-positions,body.postid-39 .learn-body .br39-types,body.postid-39 .learn-body .br39-fullmodel,body.postid-39 .learn-body .br39-next,body.postid-39 .learn-body .br39-safety,body.postid-39 .learn-body .br39-stop{box-sizing:border-box;color:#19374f}
body.postid-39 .learn-body .br39-first *,body.postid-39 .learn-body .br39-compare *,body.postid-39 .learn-body .br39-positions *,body.postid-39 .learn-body .br39-types *,body.postid-39 .learn-body .br39-fullmodel *,body.postid-39 .learn-body .br39-next *{box-sizing:border-box}
.br39-first{margin:1.6rem 0 1.8rem;padding:1.3rem 1.4rem 1.5rem;border:1px solid #c5d9e7;border-radius:22px;background:linear-gradient(145deg,#e8f3fb,#f6fafe)}
.br39-first h2{margin:0 0 1.1rem!important;padding:0!important;border:0!important;color:#163a5c!important;font-size:1.2rem!important}
.br39-start{position:relative;display:grid;grid-template-columns:auto 1fr;column-gap:.75rem;align-items:center;width:min(100%,450px);margin:auto;padding:.8rem 1rem;background:#173b5c;color:#fff;border-radius:14px;box-shadow:0 5px 14px #193f6125}
.br39-step-no{grid-row:span 2;display:grid;place-items:center;width:36px;height:36px;border-radius:50%;background:#65b8e4;color:#0d314e;font-weight:900}.br39-start strong{font-size:1.07rem}.br39-start>span:last-child{font-size:.87rem;opacity:.93}
.br39-start:after{content:"";position:absolute;left:50%;bottom:-22px;height:22px;border-left:3px solid #84a8be}
.br39-question{position:relative;width:min(100%,365px);margin:22px auto 0;padding:.7rem .9rem;text-align:center;background:#fff;border:2px solid #285f88;border-radius:12px;color:#174269;font-weight:850}
.br39-question:after{content:"";position:absolute;left:50%;bottom:-25px;height:25px;border-left:3px solid #84a8be}
.br39-branches{position:relative;display:grid;grid-template-columns:1.25fr 1fr;gap:1rem;margin-top:25px;padding-top:24px}.br39-branches:before{content:"";position:absolute;top:0;left:25%;right:25%;height:3px;background:#84a8be}
.br39-branch{--accent:#246fa6;--wash:#ecf7ff;position:relative;min-width:0;padding:1rem;border:2px solid var(--accent);border-radius:15px;background:var(--wash);text-align:center;box-shadow:0 4px 14px #173d5e12}.br39-branch:before{content:"";position:absolute;left:50%;top:-24px;height:24px;border-left:3px solid #84a8be}.br39-branch.is-secondary{--accent:#b7671d;--wash:#fff3e7}
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