:root{
  --bg:#f4f1ea; --card:#fffdf9; --ink:#2c2a26; --muted:#8c857a;
  --accent:#46617d; --accent-d:#374e66; --warm:#bf8a5b; --line:#e7e0d4;
  --soft:#eef1f4; --shadow:0 4px 22px rgba(60,50,35,.07);
  --serif:"Noto Serif JP","Noto Serif TC",serif;
  --sans:"Noto Sans JP","Noto Sans TC",system-ui,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:var(--sans);background:var(--bg);color:var(--ink);line-height:1.75;
  -webkit-font-smoothing:antialiased;letter-spacing:.02em}
a{color:var(--accent);text-decoration:none}
a:hover{color:var(--accent-d)}

header{background:rgba(255,253,249,.9);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);position:sticky;top:0;z-index:30}
.nav{max-width:1120px;margin:0 auto;padding:15px 22px;display:flex;align-items:center;gap:16px}
.logo{font-family:var(--serif);font-weight:700;font-size:21px;letter-spacing:.06em}
.logo span{color:var(--accent)}
.logo a{color:inherit}
.nav .back{font-size:14px;color:var(--muted);font-weight:600}
.nav .spacer{margin-left:auto}
.lang{display:flex;gap:2px;border:1px solid var(--line);border-radius:999px;padding:3px;background:var(--card)}
.lang button{border:none;background:none;padding:5px 11px;border-radius:999px;font-size:13px;
  color:var(--muted);cursor:pointer;font-weight:600;font-family:var(--sans);transition:.15s}
.lang button.on{background:var(--accent);color:#fff}

main{max-width:1120px;margin:0 auto;padding:26px 22px 60px}
.hero{text-align:center;padding:30px 0 10px}
.hero h1{font-family:var(--serif);font-size:32px;font-weight:700;letter-spacing:.06em}
.hero .rule{width:46px;height:3px;background:var(--warm);margin:14px auto;border-radius:3px}
.hero p{color:var(--muted);font-size:15px}

.searchbar{max-width:520px;margin:22px auto 0;position:relative}
.searchbar input{width:100%;padding:14px 18px 14px 46px;font-size:15px;border:1.5px solid var(--line);
  border-radius:999px;background:var(--card);font-family:var(--sans);transition:.15s}
.searchbar input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(70,97,125,.12)}
.searchbar::before{content:"🔍";position:absolute;left:18px;top:50%;transform:translateY(-50%);opacity:.5}

.ad{margin:26px auto;max-width:1120px;text-align:center}
.ad:empty{display:none}            /* 沒有廣告時完全隱藏，訪客看不到佔位 */
.ad ins{display:block}

.cat{margin-top:34px}
.cat h2{font-family:var(--serif);font-size:20px;font-weight:700;display:flex;align-items:center;gap:10px;
  padding-bottom:10px;border-bottom:1px solid var(--line);margin-bottom:18px}
.cat h2 .tag{font-size:12px;color:var(--muted);font-family:var(--sans);font-weight:500;margin-left:auto}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(238px,1fr));gap:16px}
.ccard{display:block;background:var(--card);border:1px solid var(--line);border-radius:15px;padding:20px;
  box-shadow:var(--shadow);transition:.18s;position:relative}
.ccard:hover{transform:translateY(-3px);border-color:var(--accent);box-shadow:0 10px 28px rgba(60,50,35,.12)}
.ccard .ico{font-size:26px;display:block;margin-bottom:10px}
.ccard .nm{font-weight:700;font-size:16px;color:var(--ink);margin-bottom:5px}
.ccard .ds{font-size:13px;color:var(--muted);line-height:1.6}
.ccard .arrow{position:absolute;right:18px;top:20px;color:var(--accent);opacity:0;transition:.18s}
.ccard:hover .arrow{opacity:1}
.empty{text-align:center;color:var(--muted);padding:50px;font-size:15px}

/* calculator page */
.grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:8px}
@media(max-width:820px){.grid{grid-template-columns:1fr}}
.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:26px;box-shadow:var(--shadow)}
.card h2{font-family:var(--serif);font-size:18px;margin-bottom:20px;display:flex;align-items:center;gap:9px;font-weight:700}
.calc-head{display:flex;align-items:center;gap:14px;margin-bottom:6px}
.calc-head .ico{font-size:34px}
.calc-head h1{font-family:var(--serif);font-size:27px;font-weight:700}
.calc-head .ds{color:var(--muted);font-size:14px;margin-top:2px}

.field{margin-bottom:18px}
.field label{display:block;font-size:13.5px;font-weight:600;color:var(--ink);margin-bottom:7px}
.input-wrap{position:relative}
.input-wrap input,.input-wrap select{width:100%;padding:13px 60px 13px 15px;font-size:16px;border:1.5px solid var(--line);
  border-radius:11px;background:#fbf9f4;transition:.15s;font-weight:600;color:var(--ink);font-family:var(--sans)}
.input-wrap select{padding-right:15px;appearance:none;cursor:pointer}
.input-wrap input:focus,.input-wrap select:focus{outline:none;border-color:var(--accent);background:#fff;box-shadow:0 0 0 3px rgba(70,97,125,.12)}
.unit{position:absolute;right:15px;top:50%;transform:translateY(-50%);color:var(--muted);font-size:13.5px;font-weight:600;pointer-events:none}
.hint{font-size:12px;color:var(--muted);margin-top:6px}
.seg{display:flex;gap:8px;flex-wrap:wrap}
.seg button{flex:1;min-width:120px;padding:11px;border:1.5px solid var(--line);background:#fbf9f4;
  border-radius:11px;font-size:13.5px;font-weight:700;color:var(--muted);cursor:pointer;transition:.15s;font-family:var(--sans)}
.seg button.on{border-color:var(--accent);background:var(--soft);color:var(--accent-d)}

.res-main{text-align:center;padding:6px 0 20px;border-bottom:1px solid var(--line);margin-bottom:20px}
.res-main .lbl{font-size:13.5px;color:var(--muted)}
.res-main .big{font-family:var(--serif);font-size:38px;font-weight:700;color:var(--accent-d);margin-top:6px;word-break:break-all}
.res-main .sub{font-size:12.5px;color:var(--muted);margin-top:5px}
.res-rows{display:grid;gap:11px}
.res-row{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:12px 15px;
  background:#faf8f2;border-radius:11px;font-size:14.5px}
.res-row b{font-size:16px;font-weight:700;text-align:right}
.res-row.hl{background:#f9efe2}
.res-row.hl b{color:var(--warm)}
.note-line{font-size:12.5px;color:var(--muted);margin-top:14px;line-height:1.7}

.charts{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.charts.one{grid-template-columns:1fr;max-width:520px;margin:0 auto}
@media(max-width:820px){.charts{grid-template-columns:1fr}}
.chart-box{position:relative;height:290px}

.table-card{margin-top:24px}
.table-tools{display:flex;align-items:center;gap:14px;margin-bottom:16px;flex-wrap:wrap}
.table-tools h2{margin:0}
.table-tools .note{font-size:13px;color:var(--muted);margin-left:auto}
.table-scroll{max-height:440px;overflow:auto;border:1px solid var(--line);border-radius:13px}
table{width:100%;border-collapse:collapse;font-size:13.5px;white-space:nowrap}
thead th{position:sticky;top:0;background:#efeadf;color:var(--ink);font-weight:700;padding:12px 15px;
  text-align:right;border-bottom:2px solid var(--line)}
thead th:first-child{text-align:center}
tbody td{padding:11px 15px;text-align:right;border-bottom:1px solid #f2ede2}
tbody td:first-child{text-align:center;color:var(--muted);font-weight:600}
tbody tr:hover{background:#faf8f2}
tbody tr.year-mark td{background:#f0f3f6;font-weight:600}

.formula-card{margin-top:24px}
.formula-card h2{font-family:var(--serif);font-size:18px;margin-bottom:12px;font-weight:700}
.formula-card p{color:#41423d;margin-bottom:10px}
.formula{background:var(--soft);border-left:3px solid var(--accent);padding:14px 18px;border-radius:9px;
  font-size:15px;margin:10px 0;font-family:"Cambria Math",Georgia,serif}

/* 導購 / affiliate 區 */
.offers-card{margin-top:24px;border-color:#e7dcc6;background:linear-gradient(180deg,#fffdf9,#fdf8ee)}
.offers-head{display:flex;align-items:baseline;gap:12px;margin-bottom:16px;flex-wrap:wrap}
.offers-head h2{font-family:var(--serif);font-size:18px;font-weight:700;margin:0}
.offers-head .spon{font-size:11.5px;color:#a99e88;margin-left:auto}
.offers{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px}
.offer{display:flex;align-items:center;gap:13px;background:#fff;border:1px solid var(--line);
  border-radius:13px;padding:15px 16px;transition:.16s;position:relative}
.offer:hover{border-color:var(--warm);box-shadow:0 8px 22px rgba(150,110,60,.13);transform:translateY(-2px)}
.offer .oico{font-size:26px;flex-shrink:0}
.offer .onm{font-weight:700;font-size:14.5px;color:var(--ink);line-height:1.4}
.offer .ods{font-size:12.5px;color:var(--muted);margin-top:3px;line-height:1.5}
.offer .octa{margin-left:auto;flex-shrink:0;font-size:13px;font-weight:700;color:var(--warm);white-space:nowrap}

.related{margin-top:34px}
.related h2{font-family:var(--serif);font-size:18px;margin-bottom:16px;font-weight:700}

footer{background:#2c2a26;color:#b3a99a;margin-top:54px}
.foot{max-width:1120px;margin:0 auto;padding:36px 22px;display:flex;flex-wrap:wrap;gap:30px}
.foot .col{flex:1;min-width:180px}
.foot h4{color:#fff;font-family:var(--serif);font-size:15px;margin-bottom:12px;font-weight:700}
.foot p,.foot a{font-size:13.5px;color:#b3a99a}
.foot a{display:block;padding:4px 0}
.foot a:hover{color:#fff}
.disclaimer{font-size:12px;color:#857c6e;text-align:center;padding:0 22px 22px;max-width:860px;margin:0 auto;line-height:1.8}
.copy{border-top:1px solid #3c3a35;text-align:center;padding:17px;font-size:13px;color:#857c6e}