:root{--lg-ink:#17324d;--lg-deep:#10273b;--lg-orange:#f28c28;--lg-orange-dark:#d96f0d;--lg-teal:#138a80;--lg-cream:#fff9f1;--lg-soft:#f4f7f7;--lg-border:#dce4e7;--lg-muted:#667680}
body{font-family:'Noto Sans TC',sans-serif;color:#263238;background:#fff;line-height:1.75}
.lg-container{max-width:1120px;margin:0 auto;padding:0 1.25rem}
.lg-hero{padding:clamp(3rem,7vw,6rem) 0;background:var(--lg-cream);overflow:hidden}
.lg-hero-grid{display:grid;gap:2.5rem;align-items:center}
.lg-kicker{display:inline-flex;padding:.36rem .8rem;border:1px solid #efd8ba;background:#fff;border-radius:999px;color:var(--lg-orange-dark);font-size:.76rem;font-weight:900;letter-spacing:.08em;margin-bottom:1rem}
.lg-hero h1{max-width:12ch;color:var(--lg-ink);font-size:clamp(2.4rem,6vw,4.2rem);line-height:1.12;letter-spacing:-.055em;margin-bottom:1rem}
.lg-hero h1 em{color:var(--lg-teal);font-style:normal}
.lg-hero p{max-width:58ch;color:#53656e;font-size:1.04rem}
.lg-hero-actions{display:flex;flex-wrap:wrap;gap:.75rem;margin-top:1.4rem}
.lg-primary,.lg-secondary{min-height:48px;display:inline-flex;align-items:center;justify-content:center;border-radius:14px;padding:.8rem 1.2rem;font-weight:900;text-decoration:none;cursor:pointer}
.lg-primary{background:var(--lg-orange);color:#fff;border:1px solid var(--lg-orange)}
.lg-primary:hover{background:var(--lg-orange-dark)}
.lg-secondary{background:#fff;color:var(--lg-ink);border:1px solid #cbd7db}
.lg-hero-note{margin-top:.8rem!important;font-size:.76rem!important;color:#7b898f!important}

.lg-building-map{position:relative;min-height:330px;background:#fff;border:1px solid #ecdcc8;border-radius:28px;padding:1.4rem;box-shadow:0 22px 60px rgba(23,50,77,.1)}
.lg-building{height:100%;min-height:300px;display:grid;grid-template-columns:1fr 1fr;gap:8px;align-content:end}
.lg-unit{position:relative;min-height:76px;border-radius:13px;background:#edf4f3;border:1px solid #cddfdd;padding:.65rem;color:var(--lg-ink);font-size:.72rem;font-weight:800}
.lg-unit::before{content:'';position:absolute;left:16px;right:16px;top:32px;height:5px;background:#7ec1bb;border-radius:99px}
.lg-unit::after{content:'';position:absolute;right:24px;top:24px;width:10px;height:28px;border-left:4px solid #3b8290;border-bottom:4px solid #3b8290;border-radius:0 0 0 7px}
.lg-riser{position:absolute;left:50%;top:32px;bottom:38px;width:8px;background:var(--lg-orange);border-radius:99px;transform:translateX(-50%)}
.lg-riser::after{content:'共用立管／垂直管線';position:absolute;top:50%;left:16px;white-space:nowrap;color:#a84f0c;font-size:.68rem;font-weight:900;background:#fff8f0;padding:.25rem .5rem;border-radius:99px}
.lg-map-legend{position:absolute;left:20px;bottom:14px;font-size:.68rem;color:var(--lg-muted)}

.lg-source{padding:1rem 1.25rem;background:var(--lg-ink);color:#dbe7eb;font-size:.76rem;text-align:center}
.lg-source a{color:#ffd4a6;text-decoration:underline}
.lg-era{padding:clamp(3.5rem,7vw,5.5rem) 0;background:#fff}
.lg-era-head{max-width:760px;margin-bottom:1.4rem}
.lg-era-head h2{color:var(--lg-ink);font-size:clamp(1.7rem,4vw,2.35rem);line-height:1.3;margin-bottom:.45rem}
.lg-era-head p{color:var(--lg-muted);font-size:.88rem}
.lg-era-grid{display:grid;gap:.7rem}
.lg-era-card{position:relative;border:1px solid var(--lg-border);border-radius:16px;padding:1rem;background:#fff}
.lg-era-card::before{content:'';position:absolute;left:0;top:16px;bottom:16px;width:4px;border-radius:0 99px 99px 0;background:var(--lg-teal)}
.lg-era-year{color:var(--lg-orange-dark);font-size:.72rem;font-weight:900;letter-spacing:.08em;margin-bottom:.25rem}
.lg-era-card strong{display:block;color:var(--lg-ink);font-size:.9rem;margin-bottom:.25rem}
.lg-era-card p{color:var(--lg-muted);font-size:.74rem;line-height:1.6}

#leak-guide-tool{scroll-margin-top:130px;padding:clamp(4rem,8vw,6.5rem) 0;background:var(--lg-soft)}
.lg-tool-shell{background:#fff;border:1px solid var(--lg-border);border-radius:28px;overflow:hidden;box-shadow:0 22px 65px rgba(23,50,77,.09)}
.lg-tool-top{padding:1.1rem 1.25rem;border-bottom:1px solid var(--lg-border);display:flex;align-items:center;justify-content:space-between;gap:1rem}
.lg-progress{display:flex;align-items:center;gap:.4rem}
.lg-progress-item{width:30px;height:6px;border-radius:99px;background:#dfe7e9;transition:.2s}
.lg-progress-item.is-active{width:48px;background:var(--lg-orange)}
.lg-progress-item.is-done{background:var(--lg-teal)}
#lg-progress-label{font-size:.74rem;color:var(--lg-muted);font-weight:800}
.lg-step{padding:clamp(1.35rem,4vw,2.5rem)}
.lg-step-head{max-width:760px;margin-bottom:1.35rem}
.lg-step-number{font-size:.72rem;letter-spacing:.12em;color:var(--lg-orange-dark);font-weight:900;margin-bottom:.4rem}
.lg-step h2{font-size:clamp(1.65rem,4vw,2.25rem);color:var(--lg-ink);line-height:1.3;margin-bottom:.45rem}
.lg-step-lead{color:var(--lg-muted);font-size:.9rem}
.lg-fieldset{border:0;padding:0;margin:0 0 1.5rem}
.lg-fieldset legend{font-size:.88rem;color:var(--lg-ink);font-weight:900;margin-bottom:.7rem}
.lg-options{display:grid;gap:.75rem}
.lg-options.age{grid-template-columns:repeat(2,1fr)}
.lg-option{text-align:left;border:1px solid var(--lg-border);border-radius:16px;background:#fff;padding:1rem;cursor:pointer;transition:.18s;min-height:88px}
.lg-option:hover{border-color:#9fb6bd;transform:translateY(-1px)}
.lg-option.is-selected{border:2px solid var(--lg-teal);background:#effaf7;padding:calc(1rem - 1px)}
.lg-option-title{display:block;color:var(--lg-ink);font-size:.94rem;font-weight:900;margin-bottom:.25rem}
.lg-option-hint{display:block;color:var(--lg-muted);font-size:.74rem;line-height:1.55}
.lg-step-actions{display:flex;align-items:center;justify-content:space-between;gap:.75rem;margin-top:1.5rem}
.lg-next,.lg-back{min-height:46px;border-radius:12px;padding:.7rem 1.1rem;font-weight:900;cursor:pointer}
.lg-next{margin-left:auto;border:0;background:var(--lg-orange);color:#fff}
.lg-next:disabled{background:#ccd5d8;color:#fff;cursor:not-allowed}
.lg-back{border:1px solid var(--lg-border);background:#fff;color:var(--lg-ink)}

.lg-result-summary{display:grid;grid-template-columns:repeat(3,1fr);gap:.6rem;margin-bottom:1.25rem}
.lg-result-summary div{background:var(--lg-ink);color:#fff;padding:.8rem;border-radius:14px}
.lg-result-summary span{display:block;color:#aac0c9;font-size:.66rem;margin-bottom:.15rem}
.lg-result-summary strong{font-size:.84rem}
.lg-result-block{border-top:1px solid var(--lg-border);padding:1.5rem 0}
.lg-result-block:first-of-type{border-top:0}
.lg-result-block>h3{color:var(--lg-ink);font-size:1.2rem;margin-bottom:.35rem}
.lg-result-sub{font-size:.8rem;color:var(--lg-muted);margin-bottom:1rem}
.lg-list,.lg-cause-list{display:grid;gap:.65rem;list-style:none}
.lg-list li,.lg-cause-list li{position:relative;padding-left:1.1rem;color:#53656e;font-size:.86rem}
.lg-list li::before,.lg-cause-list li::before{content:'';position:absolute;left:0;top:.7em;width:6px;height:6px;border-radius:50%;background:var(--lg-orange)}
.lg-watch{margin-top:.9rem;padding:.75rem .85rem;background:#fff7ed;border-radius:12px;color:#805019;font-size:.78rem}
.lg-watch strong{display:block;color:#a84f0c;margin-bottom:.2rem}
.lg-age-note{background:#eff8f6;border:1px solid #c7e1dd;border-radius:16px;padding:1rem;margin-top:1rem}
.lg-age-note strong{color:var(--lg-teal)}
.lg-age-note p{font-size:.82rem;color:#45656a;margin:.25rem 0}
.lg-age-note small{display:block;color:#728388;line-height:1.6}
.lg-methods{display:grid;gap:.75rem}
.lg-method-card{display:grid;grid-template-columns:auto 1fr;gap:.8rem;border:1px solid var(--lg-border);border-radius:16px;padding:1rem}
.lg-order{width:30px;height:30px;border-radius:50%;display:grid;place-items:center;background:var(--lg-cream);color:var(--lg-orange-dark);font-weight:900;font-size:.76rem}
.lg-method-card h4,.lg-repair-card h4,.lg-case-card h4{color:var(--lg-ink);font-size:.94rem;margin-bottom:.25rem}
.lg-method-card p,.lg-repair-card p{color:#53656e;font-size:.8rem}
.lg-limit,.lg-warning{margin-top:.45rem;font-size:.72rem;color:#7a898e;line-height:1.6}
.lg-repairs,.lg-cases{display:grid;gap:.75rem}
.lg-repair-card{border:1px solid var(--lg-border);border-radius:16px;padding:1rem;background:#fff}
.lg-warning{padding:.55rem .65rem;background:#fff7ed;border-radius:9px;color:#805019}
.lg-case-card{border:1px solid var(--lg-border);border-radius:18px;padding:1rem;background:#fff}
.lg-case-meta{font-size:.68rem;color:var(--lg-teal);font-weight:800;margin-bottom:.35rem}
.lg-case-card dl{display:grid;gap:.5rem;margin:.7rem 0}
.lg-case-card dl div{display:grid;grid-template-columns:72px 1fr;gap:.45rem;font-size:.74rem}
.lg-case-card dt{font-weight:900;color:var(--lg-ink)}
.lg-case-card dd{color:var(--lg-muted)}
.lg-case-card a{font-size:.75rem;color:var(--lg-orange-dark);font-weight:900}
.lg-result-actions{display:flex;flex-wrap:wrap;gap:.7rem;margin-top:1rem}
.lg-disclaimer{margin-top:1rem;color:#7b898f;font-size:.72rem;line-height:1.65}
.lg-loading{padding:3rem;text-align:center;color:var(--lg-muted)}
.lg-loading.is-error{color:#9b3c28}

.lg-library{padding:clamp(4rem,8vw,6rem) 0;background:#fff}
.lg-library-grid{display:grid;gap:1rem;margin-top:1.5rem}
.lg-library-card{border:1px solid var(--lg-border);border-radius:18px;padding:1.15rem;color:var(--lg-ink);text-decoration:none}
.lg-library-card span{display:block;color:var(--lg-orange-dark);font-size:.7rem;font-weight:900;margin-bottom:.35rem}
.lg-library-card strong{display:block;margin-bottom:.3rem}
.lg-library-card p{color:var(--lg-muted);font-size:.78rem}
.lg-cta{padding:clamp(4rem,8vw,6rem) 1.25rem;text-align:center;background:var(--lg-ink);color:#fff}
.lg-cta h2{font-size:clamp(1.7rem,4vw,2.4rem);margin-bottom:.5rem}
.lg-cta p{color:#ccdade;margin-bottom:1.25rem}

@media(min-width:720px){
  .lg-hero-grid{grid-template-columns:1fr .9fr}
  .lg-options.housing{grid-template-columns:repeat(4,1fr)}
  .lg-options.age{grid-template-columns:repeat(3,1fr)}
  .lg-options.symptom{grid-template-columns:repeat(3,1fr)}
  .lg-methods{grid-template-columns:repeat(2,1fr)}
  .lg-repairs{grid-template-columns:repeat(3,1fr)}
  .lg-cases{grid-template-columns:repeat(3,1fr)}
  .lg-library-grid{grid-template-columns:repeat(3,1fr)}
  .lg-era-grid{grid-template-columns:repeat(5,1fr)}
}
@media(max-width:540px){
  .lg-result-summary{grid-template-columns:1fr}
  .lg-options.age{grid-template-columns:1fr}
  .lg-step-actions{align-items:stretch}
  .lg-next,.lg-back{flex:1}
}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important}}