:root{font-family:Arial,Helvetica,sans-serif;color:#152c36;background:#f4f7f9;font-size:16px;--blue:#154fec;--ink:#142e3b;--muted:#516675}*{box-sizing:border-box}body{margin:0}header,main,footer{max-width:1200px;margin:auto}header{height:86px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #d3dfe6}.brand{color:var(--ink);text-decoration:none;font-size:30px;font-weight:800;letter-spacing:-2px}.brand-mark{color:var(--blue)}.brand>span:last-child{font-size:13px;letter-spacing:2px;margin-left:17px}.privacy,.eyebrow{font-size:12px;font-weight:700;letter-spacing:2px}.privacy{color:var(--muted)}.intro{padding:34px 0 30px}.eyebrow{color:var(--blue);margin:0 0 14px}h1{font-size:48px;letter-spacing:-2px;margin:0 0 12px;line-height:1.05}h1>span{color:var(--blue)}.intro>p:last-child{margin:0;color:var(--muted);font-size:18px}.workspace{display:grid;grid-template-columns:1.05fr 1fr;gap:24px;align-items:start}.input-panel{background:white;border:1px solid #d6e0e6;border-radius:18px;overflow:hidden}.tabs{display:flex;border-bottom:1px solid #dde5e9;background:#f8fafb}.tabs button{width:50%;border:0;border-bottom:3px solid transparent;background:none;padding:22px 8px;font-size:15px;font-weight:700;color:var(--muted);cursor:pointer}.tabs button[aria-selected=true]{border-color:var(--blue);color:var(--blue);background:white}[role=tabpanel]{padding:25px}.section-title{display:flex;align-items:center;justify-content:space-between;gap:10px}h2{margin:0;font-size:22px;letter-spacing:-.6px}.pill{display:inline-block;padding:6px 9px;border-radius:5px;background:#e8eefb;color:#264b93;font-size:11px;font-weight:700;letter-spacing:.7px}.muted{color:var(--muted);line-height:1.5;font-size:15px}.upload{position:relative;border:1px dashed #91a8bb;border-radius:12px;background:#f5f8ff;display:flex;align-items:center;flex-direction:column;gap:8px;padding:22px;cursor:pointer}.upload input{position:absolute;inset:0;opacity:0;width:100%;height:100%;cursor:pointer}.upload:focus-within{outline:3px solid #154fec}.upload-icon{font-size:30px;color:var(--blue)}.upload small{color:var(--muted);font-size:13px;margin-top:6px}.upload>span:not(.upload-icon){color:var(--muted);font-size:14px}.tips{margin-top:20px}summary{cursor:pointer;font-size:15px;font-weight:700;line-height:1.4}li{font-size:14px;color:var(--muted);line-height:1.5;margin:8px 0}ul{padding-left:20px}.result-panel{background:#112e3d;color:white;border-radius:18px;padding:28px;min-height:540px}.result-top{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-bottom:26px}.result-top .eyebrow{color:#90b8ff;margin:0}.result-top .small{color:#b9c9d2}.small{font-size:13px;line-height:1.5;color:var(--muted)}#empty-result{text-align:center;padding:20px 22px}#empty-result>p{line-height:1.6;color:#b9c9d2;font-size:16px}.measurement-art{position:relative;margin:8px auto 36px;width:200px;display:grid;grid-template-columns:20px 1fr;gap:24px;align-items:center;color:#88afff;padding-right:30px}.measurement-art i{height:1px;background:#7092a6;position:relative}.measurement-art i:after,.measurement-art i:before{content:'';width:6px;height:6px;position:absolute;top:-3px;border-radius:50%;background:#8db6ff}.measurement-art i:after{right:0}.measurement-art b{position:absolute;right:0;top:0;height:100%;border-left:1px solid #7092a6;padding-left:10px;font-weight:400}.empty-foot{margin-top:40px;line-height:2;font-size:11px;letter-spacing:2px;color:#8da7b7}.result-panel .pill{background:#254757;color:#cfddf0}#shape-name{font-size:52px;margin:10px 0 6px;font-weight:500;letter-spacing:-2px}#boundary{line-height:1.5;color:#d2dee6;font-size:15px}.measurements{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid #416071;border-left:1px solid #416071;margin-top:22px}.measurements>div{padding:13px;border-bottom:1px solid #416071;border-right:1px solid #416071}.measurements span{display:block;color:#b7c9d4;font-size:13px}.measurements strong{display:block;font-size:25px;font-weight:500;margin-top:8px}.measurements small{font-size:13px;color:#b7c9d4} .result-panel .small{color:#b7c9d4}.reason{border-top:1px solid #416071;margin-top:18px;padding-top:16px}.reason h3{font-size:16px;margin:0 0 10px}.reason p{font-size:14px;line-height:1.6}.result-panel details{margin-top:18px}#scores{display:grid;grid-template-columns:1fr 1fr;gap:8px;padding-top:16px;font-size:13px;color:#b7c9d4}.unit-row{display:flex;justify-content:space-between;align-items:center;margin:23px 0;font-size:14px}select{background:white;border:1px solid #becdd7;border-radius:6px;color:var(--ink);padding:10px;font-size:14px;max-width:100%}.fields{display:grid;grid-template-columns:1fr 1fr;gap:24px 18px}label{font-size:14px;font-weight:700}input[type=number]{display:block;width:100%;padding:13px;margin:8px 0;border:1px solid #b8cbd7;border-radius:7px;font-size:21px;color:var(--ink);background:#fcfdfe}label small{font-size:12px;font-weight:400;color:var(--muted);line-height:1.5;display:block}.primary{display:flex;align-items:center;justify-content:space-between;background:var(--blue);color:white;font-size:16px;font-weight:700;border:0;border-radius:8px;width:100%;padding:17px 20px;margin-top:26px;cursor:pointer}.primary:hover{background:#103bc6}.primary:disabled{opacity:.5;cursor:wait}.manual-note{padding-top:16px;border-top:1px solid #dbe4e8;font-size:14px;color:var(--muted);line-height:1.6}#photo-status,#manual-status{font-size:14px;line-height:1.5;color:#9d351c}#photo-status:empty,#manual-status:empty{display:none}
.photo-prep{background:#f8fafc;border:1px solid #e2e8f0;border-radius:10px;padding:12px 16px;margin:12px 0 16px}
.photo-prep-header{font-size:13px;font-weight:700;color:#1e293b;margin-bottom:6px;text-transform:uppercase;letter-spacing:.5px}
.photo-prep-list{margin:0;padding-left:18px;display:grid;grid-template-columns:1fr 1fr;gap:4px 16px}
.photo-prep-list li{font-size:13px;color:#475569;margin:2px 0;line-height:1.4}
@media (max-width: 640px){.photo-prep-list{grid-template-columns:1fr}}
.photo-alert{background:#fef2f2;border:1px solid #fecaca;border-radius:10px;padding:14px 16px;margin:12px 0;color:#991b1b}
.photo-alert[hidden]{display:none}
.photo-alert-text{font-size:14px;font-weight:600;margin:0 0 10px;line-height:1.4}
.photo-alert-actions{display:flex;gap:10px;flex-wrap:wrap}
.photo-alert-actions .btn-subtle{background:#fff;border:1px solid #fca5a5;color:#991b1b;padding:6px 12px;border-radius:6px;font-size:13px;font-weight:600;cursor:pointer;transition:background .15s}
.photo-alert-actions .btn-subtle:hover{background:#fee2e2}
.photo-status-top{font-size:14px;line-height:1.5;color:#1e40af;background:#eff6ff;border:1px solid #dbeafe;border-radius:8px;padding:10px 14px;margin:12px 0}
.photo-status-top:empty{display:none}#portrait{width:100%;max-height:355px;object-fit:contain;background:#e8edf2;border-radius:9px;cursor:crosshair;display:block;margin-top:15px;touch-action:manipulation}.photo-controls{display:flex;gap:10px;justify-content:space-between;align-items:end;margin-top:12px}.photo-controls label{font-size:12px;flex:1}.photo-controls select{display:block;width:100%;margin-top:6px}.text-button{padding:10px 0;border:0;background:none;color:var(--blue);font-size:13px;cursor:pointer}.method{display:grid;grid-template-columns:1fr 1.4fr;gap:60px;border-top:1px solid #d0dce4;margin-top:40px;padding:30px 0}.method p{color:var(--muted);line-height:1.6;font-size:14px}.method a{color:var(--blue)}#rule-list{line-height:1.8;font-size:14px}footer{border-top:1px solid #d0dce4;padding:24px 0;font-size:12px;font-weight:700;letter-spacing:1px;display:flex;justify-content:space-between;color:var(--muted)}button:focus-visible,select:focus-visible,input:focus-visible,summary:focus-visible,canvas:focus-visible{outline:3px solid #80a5ff;outline-offset:3px}[hidden]{display:none!important}@media(max-width:1250px){header,main,footer{margin-left:28px;margin-right:28px}}@media(max-width:760px){header{height:70px}.privacy{font-size:10px;letter-spacing:.5px}.brand>span:last-child{display:none}h1{font-size:37px}.intro{padding:28px 0}.workspace,.method{grid-template-columns:1fr}.result-panel{min-height:440px}.method{gap:15px;margin-top:28px}.fields{gap:18px 12px}[role=tabpanel]{padding:20px}.section-title{align-items:start}.pill{font-size:10px}.section-title h2{font-size:21px}header,main,footer{margin-left:16px;margin-right:16px}footer span{max-width:180px;text-align:right}.result-panel{padding:24px}.tabs button{font-size:13px}}@media(prefers-reduced-motion:no-preference){#result-content{animation:appear .25s ease-out}@keyframes appear{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}}
/* Home tool result summary; calculation and other pages are unchanged. */
#result-summary{scroll-margin-top:12px}#result-state,#shape-name{font-size:18px;line-height:1.3;font-weight:700;letter-spacing:0;margin:0 0 8px}#result-state{display:block;padding:8px 10px;border:1px solid #90b8ff;color:#fff;background:#254757}#boundary{font-size:14px;line-height:1.35;margin:8px 0 12px}.result-panel .measurements{margin-top:10px}.result-panel .measurements>div{padding:8px 10px}.result-panel .measurements strong{font-size:21px;margin-top:3px}.ratio-summary{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin-top:12px}.ratio-summary span{display:block;font-size:12px;color:#c7d7e1}.ratio-summary strong{display:block;font-size:18px;margin-top:3px}.candidate-heading{font-size:14px;margin:14px 0 6px}.candidate-summary{padding:0;margin:0;list-style:none;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}.candidate-summary li{margin:0;padding:7px;background:#254757;color:white;font-size:14px;line-height:1.3}.candidate-summary span,.candidate-summary strong{display:block;overflow-wrap:anywhere}.candidate-summary strong{margin-top:4px;font-size:14px}.distance-note{margin:10px 0 0;color:#fff;font-size:14px;line-height:1.4}@media(max-width:760px){.result-panel{padding:16px}.result-top{margin-bottom:14px}#result-state,#shape-name{font-size:17px}.ratio-summary{gap:5px}.candidate-summary{gap:5px}}
.endpoint-guide{margin-top:18px;padding:14px;background:#f4f7fb;border:1px solid #d6e0e6;border-radius:8px}.endpoint-guide h3{margin:0 0 10px;font-size:17px}.endpoint-guide p,.endpoint-guide dd{font-size:14px;line-height:1.5;color:#364e5b}.endpoint-guide dt{font-size:14px;font-weight:700;margin-top:12px}.endpoint-guide dd{margin:4px 0 0}.endpoint-guide dl{margin:10px 0}

/* 2026-09-23: homepage navigation; existing article styles untouched. */
.home-nav{display:flex;gap:8px;align-items:center}.home-nav a,.mobile-nav a{color:var(--ink);text-decoration:none;font-size:14px;font-weight:700;padding:13px 16px;border-radius:8px}.home-nav a:hover,.mobile-nav a:hover{background:#e8eefb;color:var(--blue)}.mobile-nav{display:none;position:relative}.tool-home #detector,.tool-home #method{scroll-margin-top:20px}.tool-home a:focus-visible{outline:3px solid #80a5ff;outline-offset:3px}
@media(max-width:760px){.home-nav{display:none}.mobile-nav{display:block}.mobile-nav summary{padding:12px 16px;border:1px solid #becdd7;border-radius:8px;list-style:none}.mobile-nav summary::-webkit-details-marker{display:none}.mobile-nav[open] summary{background:#e8eefb}.mobile-nav nav{position:absolute;right:0;top:50px;width:200px;display:grid;padding:8px;background:#fff;border:1px solid #d6e0e6;border-radius:12px;box-shadow:0 12px 32px #142e3b20;z-index:10}.mobile-nav a{min-height:44px}}

/* Clear start actions, using our existing palette and system type. */
.tool-home .intro>p:not(.eyebrow):not(.intro-trust){color:var(--muted);font-size:18px;line-height:1.5;margin:0;max-width:640px}.intro-actions{display:flex;align-items:center;gap:12px;margin-top:22px;flex-wrap:wrap}.intro-actions a{display:inline-flex;align-items:center;justify-content:center;gap:24px;min-height:48px;padding:14px 20px;border-radius:10px;text-decoration:none;font-size:15px;font-weight:700;line-height:1.35}.start-action{background:var(--blue);color:#fff;border:1px solid var(--blue);box-shadow:0 5px 14px #154fec20}.start-action:hover{background:#103bc6}.manual-action{color:var(--ink);border:1px solid #b8cbd7;background:#fff}.manual-action:hover{background:#e8eefb}.tool-home .intro>.intro-trust{font-size:10px;letter-spacing:1.4px;font-weight:700;color:var(--muted);margin:16px 0 0}.tool-home .upload strong{background:var(--blue);color:white;border-radius:8px;padding:12px 22px;min-height:44px}.tool-home .upload:hover{border-color:var(--blue);background:#edf3ff}.tool-home .input-panel{box-shadow:0 8px 24px #142e3b06}
@media(max-width:760px){.intro-actions{gap:10px;margin-top:18px}.intro-actions a{width:100%;min-height:48px}.tool-home .intro{padding:24px 0}.tool-home h1{font-size:36px;line-height:1.1;letter-spacing:-1.5px}.tool-home .upload{padding:18px}.tool-home .intro>.intro-trust{font-size:10px}}
/* P008 Landmark Guidance UX */
.guidance-panel{margin-top:14px;display:flex;flex-direction:column;gap:10px}
.group-nav{display:grid;grid-template-columns:repeat(4,1fr);gap:6px}
.group-btn{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;padding:8px 4px;background:#f0f4f8;border:1px solid #c9d8e2;border-radius:8px;font-size:13px;font-weight:700;color:var(--ink);cursor:pointer;transition:background .15s,border-color .15s}
.group-btn:hover{background:#e2ebf3}
.group-btn[aria-selected="true"]{background:#fff;border-color:var(--blue);color:var(--blue);box-shadow:0 0 0 1px var(--blue)}
.group-btn.is-complete{border-color:#52b788}
.group-btn.is-complete .group-indicator{color:#2d6a4f}
.group-indicator{font-size:11px;font-weight:bold;color:var(--muted)}
.step-card{background:#f8fafc;border:1px solid #dde5eb;border-radius:8px;padding:10px 14px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px;min-height:56px}
.step-card-text{flex:1 1 200px;display:flex;flex-direction:column;gap:3px}
.step-prompt{margin:0;font-size:14px;font-weight:600;color:var(--ink)}
.step-error{margin:0;font-size:13px;font-weight:600;color:#c94a29;line-height:1.3}
.step-error[hidden]{display:none!important}
.adjust-control{display:flex;align-items:center;gap:8px}
.adjust-control label{font-size:12px;font-weight:700;color:var(--muted);display:flex;align-items:center;gap:6px}
.adjust-control select{padding:6px 10px;font-size:13px;border-radius:6px;border:1px solid #becdd7}
.photo-actions{display:flex;justify-content:flex-end;margin-top:8px}
@media(max-width:760px){
  .group-nav{grid-template-columns:repeat(2,1fr);gap:6px}
  .group-btn{padding:8px 6px;font-size:12px}
  .step-card{flex-direction:column;align-items:stretch}
  .step-card-text{flex:0 1 auto}
}
/* PL-N1: Minimum Practical Result Wiring - Guide Cards */
.practical-guides-section{border-top:1px solid #416071;margin-top:20px;padding-top:18px}
.practical-guides-title{font-size:16px;font-weight:700;margin:0 0 12px;color:#fff}
.practical-guides-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}
.guide-card{background:#1d3d4e;border:1px solid #35586c;border-radius:8px;padding:12px;display:flex;flex-direction:column;justify-content:space-between;min-height:96px}
.guide-card-slot{font-size:11px;font-weight:700;letter-spacing:0.8px;text-transform:uppercase;color:#8da7b7;margin:0 0 4px}
.guide-card-status{font-size:13px;line-height:1.4;color:#c7d7e1;margin:0}
.guide-card-action{display:inline-flex;align-items:center;gap:4px;margin-top:8px;color:#8db6ff;text-decoration:none;font-size:13px;font-weight:700}
.guide-card-action:hover{text-decoration:underline;color:#b9d2ff}
.guide-card-action:focus-visible{outline:2px solid #80a5ff;outline-offset:2px;border-radius:4px}
.guide-card-neutral{background:#173443;border-color:#2a4859}
.guide-card-neutral .guide-card-status{color:#8da7b7;font-size:12px}
@media(max-width:760px){
  .practical-guides-grid{grid-template-columns:1fr;gap:8px}
  .guide-card{min-height:auto}
}