/* 淺色紙本調：暖米紙底、墨線、淡水彩 */
:root{
  --paper:#f7f1e8; --paper2:#f1e7da; --card:rgba(255,253,249,.82); --card-solid:#fffdf9;
  --ink:#2b2621; --ink2:#6f655a; --ink3:#9a8f83; --line:rgba(43,38,33,.10); --line2:rgba(43,38,33,.18);
  --clay:#b9694a; --clay-soft:#ecc9b5; --sage:#9fb08f; --oak:#c9a77c; --soft:#f3e9de;
  --serif:"Noto Serif TC","Songti TC",serif;
  --sans:"Noto Sans TC","PingFang HK","Microsoft JhengHei",system-ui,sans-serif;
  --num:"Fraunces","Noto Serif TC",Georgia,serif;
  color-scheme: light;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
html,body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
body{background:
  radial-gradient(1200px 700px at 85% -10%,#fbf6ef 0%,transparent 60%),
  radial-gradient(900px 600px at -10% 40%,rgba(236,201,181,.22) 0%,transparent 60%),
  radial-gradient(900px 700px at 110% 75%,rgba(159,176,143,.16) 0%,transparent 60%),
  var(--paper);overflow-x:hidden}
/* 紙紋 */
.grain{position:fixed;inset:0;pointer-events:none;z-index:50;opacity:.38;mix-blend-mode:multiply;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .45 0 0 0 0 .38 0 0 0 0 .3 0 0 0 .09 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E")}

/* ───── 主視覺 ───── */
.hero{position:relative;max-width:1180px;margin:0 auto;padding:0 0 8px}
.hero-art{margin:0;position:relative}
.hero-art img{display:block;width:100%;height:auto;
  -webkit-mask-image:radial-gradient(120% 95% at 50% 40%,#000 55%,transparent 82%);
          mask-image:radial-gradient(120% 95% at 50% 40%,#000 55%,transparent 82%);
  animation:reveal 1.6s cubic-bezier(.2,.7,.2,1) both}
@keyframes reveal{from{opacity:0;transform:scale(1.035);filter:blur(3px) saturate(.6)}to{opacity:1;transform:none;filter:none}}
.hero-text{position:relative;padding:0 20px;margin-top:-18px}
.eyebrow{margin:0 0 14px;font-size:12.5px;letter-spacing:.22em;color:var(--clay);display:flex;gap:8px;align-items:center}
.eyebrow .dot{color:var(--ink3)}
h1{margin:0 0 14px;font-family:var(--serif);font-weight:700;font-size:clamp(34px,9vw,58px);line-height:1.18;letter-spacing:.02em}
.lede{margin:0 0 22px;max-width:30em;color:var(--ink2);font-size:15.5px;line-height:1.85}
.go{display:inline-flex;gap:10px;align-items:center;text-decoration:none;color:var(--ink);font-size:14.5px;letter-spacing:.08em;
  padding:11px 20px;border:1px solid var(--line2);border-radius:999px;background:rgba(255,253,249,.6);backdrop-filter:blur(6px);transition:background .2s}
.go:hover{background:var(--card-solid)}
.hero-text > *{animation:rise .9s cubic-bezier(.2,.7,.2,1) both}
.hero-text > :nth-child(2){animation-delay:.12s}.hero-text > :nth-child(3){animation-delay:.22s}.hero-text > :nth-child(4){animation-delay:.32s}
@keyframes rise{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}

@media (min-width:960px){
  .hero{display:grid;grid-template-columns:42% 58%;align-items:center;padding:28px 24px 0}
  .hero-art{order:2;margin-right:-24px}
  .hero-text{order:1;margin:0;padding:0 8px 0 24px}
}

/* ───── 版面 ───── */
.wrap{max-width:1180px;margin:0 auto;padding:28px max(16px,env(safe-area-inset-right)) 48px max(16px,env(safe-area-inset-left));scroll-margin-top:8px}
.app{display:grid;gap:16px;margin-bottom:16px}
@media (min-width:900px){
  .wrap{padding:36px 24px 64px}
  .app{grid-template-columns:minmax(0,1fr) minmax(0,1.05fr);gap:22px;align-items:start}
  .result-col{position:sticky;top:20px}
}
.card{position:relative;background:var(--card);border:1px solid var(--line);border-radius:22px;padding:22px 18px;margin:0 0 16px;
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  box-shadow:0 1px 0 rgba(255,255,255,.7) inset,0 22px 40px -32px rgba(90,60,30,.45)}
.app .card{margin:0}
@media (min-width:600px){.card{padding:28px 28px}}
h2{margin:0 0 6px;font-family:var(--serif);font-size:21px;font-weight:700;letter-spacing:.02em}
.sub{margin:0 0 14px;color:var(--ink2);font-size:14px}
.note{margin:10px 0 0;color:var(--ink2);font-size:13px;line-height:1.7}
.duo{display:grid;gap:0}
@media (min-width:900px){.duo{grid-template-columns:1fr 1fr;gap:22px}}

/* ───── 表單 ───── */
.step-h{display:flex;align-items:baseline;gap:12px;margin:26px 0 14px;font-family:var(--serif);font-size:17px;font-weight:700}
.step-h:first-child{margin-top:0}
.step-h b{font-family:var(--num);font-weight:400;font-style:italic;font-size:15px;color:var(--clay);letter-spacing:.04em}
.step-h.inline{margin:0}
.field{margin:0 0 16px}
.lab{display:flex;justify-content:space-between;align-items:baseline;margin:0 0 8px;font-size:14px;color:var(--ink2)}
.area-in{display:flex;align-items:baseline;gap:10px;border-bottom:1.5px solid var(--line2);padding:0 2px 4px;margin-bottom:10px;transition:border-color .2s}
.area-in:focus-within{border-color:var(--clay)}
.area-in input{flex:1;min-width:0;border:0;background:none;outline:none;color:var(--ink);font-family:var(--num);font-size:46px;font-weight:400;line-height:1.1;padding:0;font-variant-numeric:lining-nums tabular-nums;-moz-appearance:textfield}
.area-in input::-webkit-outer-spin-button,.area-in input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}
.area-in .unit{color:var(--ink2);font-size:15px}
.hint{margin:4px 0 0;font-size:12.5px;color:var(--ink3);line-height:1.6}
input[type=range]{-webkit-appearance:none;appearance:none;width:100%;height:28px;background:none;margin:0}
input[type=range]::-webkit-slider-runnable-track{height:4px;border-radius:4px;background:linear-gradient(90deg,var(--clay) var(--p,30%),var(--line2) var(--p,30%))}
input[type=range]::-moz-range-track{height:4px;border-radius:4px;background:var(--line2)}
input[type=range]::-moz-range-progress{height:4px;border-radius:4px;background:var(--clay)}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:24px;height:24px;margin-top:-10px;border-radius:50%;background:var(--card-solid);border:1.5px solid var(--clay);box-shadow:0 4px 10px -3px rgba(120,60,30,.4);cursor:grab}
input[type=range]::-moz-range-thumb{width:22px;height:22px;border-radius:50%;background:var(--card-solid);border:1.5px solid var(--clay);cursor:grab}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.stepper{display:flex;align-items:center;justify-content:space-between;background:var(--soft);border-radius:16px;padding:4px}
.stepper button{width:44px;height:42px;border:0;border-radius:12px;background:var(--card-solid);color:var(--ink);font-size:22px;cursor:pointer;box-shadow:0 2px 6px -4px rgba(0,0,0,.3);transition:transform .12s}
.stepper button:active{transform:scale(.93)}
.stepper output{font-family:var(--num);font-size:26px;font-variant-numeric:tabular-nums}
.seg{display:flex;gap:4px;background:var(--soft);border-radius:16px;padding:4px;flex-wrap:wrap}
.seg button{flex:1 1 0;min-width:0;border:0;background:none;color:var(--ink2);font:inherit;font-size:14px;padding:11px 6px;border-radius:12px;cursor:pointer;line-height:1.35;transition:background .2s,color .2s,box-shadow .2s}
.seg button.on{background:var(--card-solid);color:var(--ink);font-weight:500;box-shadow:0 3px 10px -5px rgba(90,50,20,.35)}
.more{border-top:1px dashed var(--line2);margin-top:22px;padding-top:18px}
.more summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;padding-bottom:6px}
.more summary::-webkit-details-marker{display:none}
.more summary i{width:12px;height:12px;position:relative}
.more summary i::before,.more summary i::after{content:'';position:absolute;left:0;top:5px;width:12px;height:1.5px;background:var(--clay);transition:transform .25s}
.more summary i::after{transform:rotate(90deg)}
.more[open] summary i::after{transform:rotate(0)}
.more[open] summary{margin-bottom:6px}
.chk{display:flex;align-items:center;gap:12px;padding:10px 0;font-size:15px;flex-wrap:wrap;cursor:pointer;border-bottom:1px solid var(--line)}
.chk input{-webkit-appearance:none;appearance:none;width:20px;height:20px;border:1.5px solid var(--line2);border-radius:6px;margin:0;display:grid;place-items:center;background:var(--card-solid);transition:background .15s,border-color .15s;cursor:pointer}
.chk input:checked{background:var(--clay);border-color:var(--clay)}
.chk input:checked::after{content:'';width:9px;height:5px;border:2px solid #fff;border-top:0;border-right:0;transform:translateY(-1px) rotate(-45deg)}
.chk small{color:var(--ink3);font-size:12px;margin-left:32px;flex-basis:100%;margin-top:-6px}
.more .field{margin-top:16px}

/* 單位類型、工程範圍、傢俬 */
.types{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-bottom:6px}
.types button{text-align:left;border:1px solid var(--line2);background:rgba(255,253,249,.6);border-radius:16px;padding:12px 12px 11px;font:inherit;color:var(--ink);cursor:pointer;transition:border-color .2s,background .2s,box-shadow .2s}
.types button b{display:block;font-weight:500;font-size:14.5px;margin-bottom:3px}
.types button span{display:block;font-size:12px;line-height:1.5;color:var(--ink3)}
.types button.on{border-color:var(--clay);background:var(--card-solid);box-shadow:0 0 0 3px rgba(185,105,74,.12)}
.types button.on b{color:var(--clay)}
.scope-note{margin:-4px 0 12px;font-size:12.5px;color:var(--ink3);line-height:1.6}
.scope-note button{border:0;background:none;color:var(--clay);font:inherit;padding:0;cursor:pointer;text-decoration:underline;text-underline-offset:3px}
.srow{display:grid;grid-template-columns:72px 1fr;align-items:center;gap:10px;margin-bottom:8px}
.srow .sl{font-size:14px;color:var(--ink2)}
.seg.sm button{padding:9px 4px;font-size:13px}
.seg button.def::after{content:'';display:inline-block;width:4px;height:4px;border-radius:50%;background:var(--clay-soft);margin-left:4px;vertical-align:middle}
.chk.dim{opacity:.5}
.scope .chk{border-bottom:0;padding:8px 0}
.scope{border-bottom:1px solid var(--line);padding-bottom:6px}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips button{border:1px solid var(--line2);background:rgba(255,253,249,.6);color:var(--ink2);border-radius:999px;padding:8px 14px;font:inherit;font-size:13.5px;cursor:pointer;transition:all .2s}
.chips button.on{background:var(--ink);border-color:var(--ink);color:#fbf6ef}
.chips button.on::before{content:'✓ ';}

/* ───── 結果 ───── */
.result{overflow:hidden;background:linear-gradient(170deg,rgba(255,253,249,.95),rgba(250,241,231,.9))}
.wash{position:absolute;inset:-40% -30% auto auto;width:360px;height:360px;pointer-events:none;opacity:.55;
  background:radial-gradient(closest-side,rgba(236,201,181,.75),rgba(236,201,181,0) 70%),
             radial-gradient(closest-side at 30% 70%,rgba(201,167,124,.35),transparent 70%);
  filter:blur(6px);animation:drift 14s ease-in-out infinite alternate}
@keyframes drift{to{transform:translate(-30px,24px) scale(1.08)}}
.result > *:not(.wash){position:relative}
.rlab{margin:0;color:var(--ink2);font-size:14px;letter-spacing:.06em}
.big{margin:6px 0 4px;font-family:var(--num);font-weight:300;font-size:clamp(40px,11vw,60px);line-height:1.08;letter-spacing:-.01em;
  font-variant-numeric:lining-nums tabular-nums;display:flex;align-items:baseline;gap:4px 12px;flex-wrap:wrap}
.big span{white-space:nowrap}
.big small{font-family:var(--serif);font-size:.48em;font-weight:500;margin-left:2px;color:var(--ink2)}
.big i{font-style:normal;font-family:var(--sans);font-size:15px;color:var(--ink3)}
.perft{margin:0 0 18px;color:var(--ink2);font-size:14.5px}
.bar{position:relative;height:8px;border-radius:6px;background:var(--line);margin:0}
.bar .fill{position:absolute;top:0;bottom:0;border-radius:6px;background:linear-gradient(90deg,var(--clay-soft),var(--clay));transition:left .5s cubic-bezier(.2,.7,.2,1),width .5s cubic-bezier(.2,.7,.2,1)}
.ends{display:flex;justify-content:space-between;margin:8px 0 24px;font-size:12px;color:var(--ink3);letter-spacing:.04em}
.mixlab{margin:0 0 8px;font-size:13px;color:var(--ink2);letter-spacing:.06em}
.mix{display:flex;height:16px;border-radius:5px;overflow:hidden;gap:2px;margin-bottom:12px}
.mix i{display:block;height:100%;transition:flex-grow .5s cubic-bezier(.2,.7,.2,1);opacity:.85}
.legend{list-style:none;margin:0 0 20px;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:6px 14px}
.legend li{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--ink2);min-width:0}
.legend li i{flex:none;width:9px;height:9px;border-radius:3px}
.legend li span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.legend li b{margin-left:auto;font-weight:500;color:var(--ink);font-variant-numeric:tabular-nums;font-family:var(--num)}
.expl{margin:0;font-size:13px;line-height:1.8;color:var(--ink2);padding-top:16px;border-top:1px dashed var(--line2)}
.share{display:flex;justify-content:center;align-items:center;gap:8px;width:100%;margin:18px 0 0;padding:14px 10px;border:0;border-radius:14px;background:var(--ink);color:#fbf6ef;font:inherit;font-size:15px;letter-spacing:.04em;cursor:pointer;transition:transform .12s,background .2s}
.share:hover{background:#3d352e}
.share:active{transform:scale(.985)}
.carry{display:flex;justify-content:space-between;align-items:center;gap:10px;margin:10px 0 0;padding:13px 16px;border:1px solid var(--line);border-radius:14px;color:var(--ink);text-decoration:none;font-size:14px;background:rgba(255,253,249,.55);transition:border-color .2s,background .2s}
.carry i{font-style:normal;color:var(--clay);transition:transform .2s}
.carry:hover{border-color:var(--clay);background:rgba(255,253,249,.85)}.carry:hover i{transform:translateX(3px)}

/* ───── 錢用喺邊 ───── */
.cats{list-style:none;margin:0;padding:0}
@media (min-width:900px){.cats{columns:2;column-gap:36px}.cat{break-inside:avoid}}
.cat{border-top:1px solid var(--line)}
.cat:first-child{border-top:0}
.cat > button{width:100%;display:grid;grid-template-columns:auto 1fr auto;gap:6px 10px;align-items:center;background:none;border:0;color:inherit;font:inherit;text-align:left;padding:14px 0;cursor:pointer}
.cat .sw{width:10px;height:10px;border-radius:3px}
.cat .nm{font-size:15px;font-weight:500}
.cat .rg{font-size:14px;font-variant-numeric:tabular-nums;color:var(--ink)}
.cat .meter{grid-column:2/-1;height:4px;border-radius:4px;background:var(--line);overflow:hidden}
.cat .meter i{display:block;height:100%;border-radius:4px;opacity:.8;transition:width .5s}
.cat .why{grid-column:2/-1;font-size:12.5px;color:var(--ink2);line-height:1.65}
.cat ul{list-style:none;margin:0 0 14px 20px;padding:10px 14px;background:var(--soft);border-radius:12px;display:none}
.cat.open ul{display:block;animation:rise .3s ease both}
.cat li{display:flex;justify-content:space-between;gap:10px;font-size:13px;padding:5px 0;line-height:1.5}
.cat li span:last-child{white-space:nowrap;color:var(--ink2);font-variant-numeric:tabular-nums}

/* ───── 其他 ───── */
.pay{margin:0;padding:0;list-style:none;position:relative}
.pay li{display:grid;grid-template-columns:auto 1fr auto;gap:12px;align-items:center;padding:11px 0;font-size:14px;position:relative}
.pay li:not(:last-child)::before{content:'';position:absolute;left:13px;top:38px;bottom:-12px;width:1px;background:var(--line2)}
.pay li b{display:inline-grid;place-items:center;width:27px;height:27px;border-radius:50%;background:var(--card-solid);border:1px solid var(--clay-soft);color:var(--clay);font-family:var(--num);font-weight:400;font-size:14px;position:relative}
.pay li span:last-child{font-variant-numeric:tabular-nums;font-family:var(--num);font-size:16px}
.dots{margin:0;padding:0;list-style:none;font-size:14px;line-height:1.75}
.dots li{position:relative;padding:5px 0 5px 18px}
.dots li::before{content:'';position:absolute;left:2px;top:15px;width:6px;height:6px;border-radius:50%;background:var(--clay-soft)}
.qs{margin:12px 0 0;padding:0;list-style:none;counter-reset:q;display:grid;gap:0 32px}
@media (min-width:700px){.qs{grid-template-columns:1fr 1fr}}
.qs li{counter-increment:q;display:flex;gap:12px;padding:9px 0;font-size:14.5px;line-height:1.6;border-bottom:1px solid var(--line)}
.qs li::before{content:counter(q,decimal-leading-zero);font-family:var(--num);font-style:italic;color:var(--clay);font-size:14px;flex:none;width:22px}
.nx{border-top:1px solid var(--line);padding:2px 0}
.nx:first-of-type{border-top:0}
.nx summary{cursor:pointer;list-style:none;font-size:15.5px;font-weight:500;padding:14px 0;display:flex;justify-content:space-between;gap:10px}
.nx summary::-webkit-details-marker{display:none}
.nx summary::after{content:'＋';color:var(--clay);font-weight:400;transition:transform .25s}
.nx[open] summary::after{transform:rotate(45deg)}
.nx p{margin:0 0 8px;font-size:14px;line-height:1.8;color:var(--ink2)}
.nx ol{margin:0 0 12px;padding-left:20px;font-size:14px;line-height:1.9}
.nx b{font-weight:500}
.buf{background:var(--soft);border-radius:12px;padding:12px 14px;color:var(--ink)!important}
.buf b{font-family:var(--num);font-weight:500}
.warn{color:var(--clay);margin:-4px 0 12px}
.next{margin:28px 0 8px}
.next h2{margin:0 0 14px 4px}
.next-grid{display:grid;gap:14px}
@media (min-width:760px){.next-grid{grid-template-columns:1fr 1fr;gap:22px}}
.ncard{display:block;text-decoration:none;color:var(--ink);border-radius:22px;padding:22px 20px;border:1px solid var(--line);
  background:linear-gradient(150deg,rgba(255,253,249,.9),rgba(243,233,222,.75));transition:transform .25s,box-shadow .25s}
a.ncard:hover{transform:translateY(-2px);box-shadow:0 22px 40px -30px rgba(90,60,30,.5)}
/* 卡頂插圖：同頁頂 hero 同一幅畫嘅局部（開工前＝設計好嘅壁龕；開工後＝梯、油漆），似同一個家嘅之前／之後。
   等 codex 恢復可以換專門畫嘅插圖（見 BRIDGE-PLAN.md） */
.ncard{overflow:hidden}
.ncard .nart{display:block;width:calc(100% + 40px);margin:-22px -20px 6px;height:150px;object-fit:cover;object-position:50% 60%;
  -webkit-mask-image:linear-gradient(180deg,#000 55%,transparent);mask-image:linear-gradient(180deg,#000 55%,transparent);
  transition:transform .6s cubic-bezier(.2,.7,.2,1)}
a.ncard:hover .nart{transform:scale(1.03)}
.ncard.soon .nart{filter:saturate(.85)}
@media (min-width:760px){.ncard .nart{height:170px}}
.ncard .nk{font-size:12px;letter-spacing:.18em;color:var(--clay)}
.ncard b{display:block;font-family:var(--serif);font-size:19px;margin:8px 0 8px}
.ncard p{margin:0 0 14px;font-size:13.5px;line-height:1.75;color:var(--ink2)}
.ncard .ngo{font-size:14px;color:var(--ink)}
.ncard.soon{background:linear-gradient(150deg,rgba(255,253,249,.7),rgba(232,239,226,.6))}
.ncard.soon .nk{color:#6f8a62}.ncard.soon .ngo{color:var(--ink3)}
.foot{padding:20px 8px 0;color:var(--ink2);font-size:13px;line-height:1.8;text-align:center}
.foot a{color:var(--clay)}
.cp{margin-top:6px}

/* 數字變動：輕輕一閃 */
.bump{animation:bump .45s ease}
@keyframes bump{40%{color:var(--clay)}}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
  html{scroll-behavior:auto}
}