/* RICHARK 電子書商城 v1 — 手機優先、暖白底＋深墨綠主色；磚紅只用於限時標示 */
:root{
  --bg:#FBFAF7; --surface:#F3F0E8; --card:#FFFFFF; --line:#E3DED3;
  --ink:#16191B; --text:#2A3034; --muted:#565E66; --caption:#666E76;
  --primary:#1E5B47; --primary-hover:#174837; --primary-soft:#E6EFEA;
  --sale:#A8321D; --sale-soft:#FBEDEA;
  --radius:12px; --tag-radius:4px;
  --shadow:0 1px 2px rgba(22,25,27,.05),0 6px 18px rgba(22,25,27,.06);
  --font:"PingFang TC","Noto Sans TC","Microsoft JhengHei",system-ui,sans-serif;
}
*{box-sizing:border-box}
html{scroll-padding-top:72px;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font);font-size:16px;line-height:1.7}
img{max-width:100%;height:auto;display:block}
a{color:var(--primary)}
a:hover{color:var(--primary-hover)}
h1,h2,h3{color:var(--ink);line-height:1.35;margin:0 0 .5em;font-weight:700;letter-spacing:.01em}
h1{font-size:28px;line-height:1.3}
h2{font-size:22px}
h3{font-size:18px;line-height:1.4}
p{margin:0 0 1em}
.wrap{max-width:1160px;margin:0 auto;padding:0 20px}
.muted{color:var(--muted)}
.small{font-size:14px;line-height:1.6}
.caption{font-size:13px;color:var(--caption);line-height:1.5}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
:focus-visible{outline:3px solid #2F7D63;outline-offset:2px}

/* header */
.site-header{position:sticky;top:0;z-index:20;background:rgba(251,250,247,.96);backdrop-filter:saturate(1.4) blur(8px);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;gap:16px;min-height:60px}
.brand{display:flex;align-items:baseline;gap:8px;text-decoration:none;color:var(--ink);font-weight:800;font-size:18px;letter-spacing:.04em;white-space:nowrap}
.brand small{font-weight:600;font-size:14px;color:var(--muted);letter-spacing:.02em}
.nav{display:flex;gap:4px;margin-left:auto;overflow-x:auto;scrollbar-width:none}
.nav::-webkit-scrollbar{display:none}
.nav a{display:inline-flex;align-items:center;min-height:44px;padding:0 12px;border-radius:8px;color:var(--text);text-decoration:none;font-size:15px;white-space:nowrap}
.nav a:hover{background:var(--surface)}
.nav a[aria-current="page"]{color:var(--primary);font-weight:700}
@media (max-width:720px){
  .site-header .wrap{flex-wrap:wrap;gap:0;padding-top:6px}
  .brand{min-height:44px;align-items:center}
  .nav{width:100%;margin:0 -8px;padding-bottom:4px}
  .nav a{padding:0 10px;font-size:15px}
}

/* buttons: 膠囊只給可點按鈕 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:48px;padding:0 24px;border-radius:999px;font:inherit;font-weight:700;font-size:16px;text-decoration:none;cursor:pointer;border:1.5px solid transparent;transition:background .15s,border-color .15s,color .15s}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-hover);color:#fff}
.btn-outline{background:transparent;color:var(--primary);border-color:var(--primary)}
.btn-outline:hover{background:var(--primary-soft)}
.btn-ghost{background:transparent;color:var(--primary);padding:0 8px;min-height:44px}
.btn-block{width:100%}
.btn[disabled],.btn[aria-disabled="true"]{background:#C9CDD0;color:#3E454B;border-color:transparent;cursor:not-allowed}
.chip{display:inline-flex;align-items:center;min-height:44px;padding:0 16px;border-radius:999px;border:1px solid var(--line);background:var(--card);color:var(--text);font:inherit;font-size:15px;cursor:pointer;text-decoration:none;white-space:nowrap}
.chip:hover{border-color:var(--primary);color:var(--primary)}
.chip[aria-pressed="true"],.chip.is-active{background:var(--primary-soft);border-color:var(--primary);color:var(--primary);font-weight:700}

/* tags: 直角小圓角 */
.tag{display:inline-block;padding:2px 8px;border-radius:var(--tag-radius);background:var(--surface);color:var(--muted);font-size:13px;line-height:1.6;font-weight:600}
.tag-sale{background:var(--sale-soft);color:var(--sale)}

/* sections */
section{padding:48px 0}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:20px}
.section-head h2{margin:0}
.section-head p{margin:4px 0 0}
.band{background:var(--surface)}

/* hero */
.hero{padding:40px 0 32px}
.hero-grid{display:grid;gap:28px}
.hero h1{font-size:28px}
.hero h1 .sub{display:block;color:var(--muted);font-weight:600;font-size:.72em;margin-top:8px;line-height:1.5}
.lead{font-size:17px;color:var(--text);max-width:40em}
.ask{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:20px;box-shadow:var(--shadow)}
.ask label{display:block;font-weight:700;color:var(--ink);margin-bottom:8px}
textarea,input[type=text],input[type=email],select{width:100%;font:inherit;font-size:16px;color:var(--ink);background:#fff;border:1px solid #CFC9BC;border-radius:10px;padding:12px 14px;line-height:1.6}
textarea{min-height:112px;resize:vertical}
textarea:focus,input:focus,select:focus{border-color:var(--primary);outline:2px solid rgba(30,91,71,.2)}
.ask .row{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0 16px}
.trust{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:24px}
.trust div{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:12px}
.trust b{display:block;color:var(--ink);font-size:18px;line-height:1.3}
.trust span{font-size:13px;color:var(--muted)}
@media (min-width:900px){
  .hero{padding:64px 0 48px}
  .hero-grid{grid-template-columns:1.1fr .9fr;align-items:center;gap:48px}
  .hero h1{font-size:40px}
  h2{font-size:28px}
}

/* category grid */
.cat-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.cat{display:block;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px;text-decoration:none;color:var(--text);min-height:104px}
.cat:hover{border-color:var(--primary);box-shadow:var(--shadow)}
.cat h3{font-size:17px;margin:0 0 4px}
.cat p{font-size:14px;color:var(--muted);margin:0;line-height:1.5}
.cat .count{display:block;font-size:13px;color:var(--primary);font-weight:700;margin-top:8px}
@media (min-width:900px){.cat-grid{grid-template-columns:repeat(3,1fr);gap:16px}}

/* book grid */
.book-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px 12px}
@media (min-width:720px){.book-grid{grid-template-columns:repeat(3,1fr);gap:24px 20px}}
@media (min-width:1080px){.book-grid{grid-template-columns:repeat(4,1fr)}}
.book{display:flex;flex-direction:column;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;text-decoration:none;color:var(--text)}
.book:hover{box-shadow:var(--shadow);border-color:#CFC9BC}
.book .cover{aspect-ratio:1/1;background:var(--surface)}
.book .cover img{width:100%;height:100%;object-fit:cover}
.book .body{padding:12px 12px 14px;display:flex;flex-direction:column;gap:6px;flex:1}
.book h3{font-size:15px;line-height:1.45;margin:0;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.book .by{font-size:13px;color:var(--muted)}
.book .meta{margin-top:auto;display:flex;align-items:center;justify-content:space-between;gap:6px;flex-wrap:wrap}
.price{font-variant-numeric:tabular-nums;font-weight:800;color:var(--ink)}
.book .price{font-size:16px}
@media (min-width:720px){.book h3{font-size:16px}.book .body{padding:14px 16px 16px}}

/* list toolbar */
.toolbar{display:flex;flex-direction:column;gap:12px;margin-bottom:20px}
.chips{display:flex;gap:8px;overflow-x:auto;padding-bottom:4px;scrollbar-width:thin}
.search{position:relative}
.search input{padding-left:40px}
.search svg{position:absolute;left:12px;top:50%;transform:translateY(-50%);color:var(--muted)}
.empty{padding:32px;text-align:center;background:var(--card);border:1px dashed #CFC9BC;border-radius:var(--radius)}

/* book detail */
.detail{display:grid;gap:24px;padding-top:24px}
.detail .cover{border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);background:var(--surface);max-width:480px}
.buybox{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:20px;display:flex;flex-direction:column;gap:12px}
.buybox .price{font-size:32px;line-height:1.1}
.buybox .price small{font-size:15px;color:var(--muted);font-weight:600;margin-left:4px}
.facts{display:flex;flex-wrap:wrap;gap:6px}
.benefits{list-style:none;padding:0;margin:0;display:grid;gap:10px}
.benefits li{display:grid;grid-template-columns:22px 1fr;gap:8px;align-items:start}
.benefits li::before{content:"";width:18px;height:18px;margin-top:4px;border-radius:50%;background:var(--primary-soft) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%231E5B47' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12l5 5L20 7'/%3E%3C/svg%3E") center/12px no-repeat}
.crumbs{font-size:14px;color:var(--muted);padding-top:16px}
.crumbs a{color:var(--muted)}
@media (min-width:900px){
  .detail{grid-template-columns:420px 1fr;gap:48px;align-items:start}
  .detail h1{font-size:32px}
  .detail .buybox{position:sticky;top:84px}
}

/* advisor */
.advisor-grid{display:grid;gap:24px}
@media (min-width:960px){.advisor-grid{grid-template-columns:420px 1fr;align-items:start}.advisor-grid .ask{position:sticky;top:84px}}
.result{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:20px;display:grid;gap:16px}
.result + .result{margin-top:16px}
.rec{display:grid;grid-template-columns:96px 1fr;gap:16px;align-items:start}
.rec img{border-radius:8px;border:1px solid var(--line)}
@media (min-width:720px){.rec{grid-template-columns:140px 1fr}}
.rec h3{margin:4px 0 6px}
.qa h4{font-size:15px;color:var(--ink);margin:0 0 4px}
.qa p,.qa ul{margin:0 0 12px;font-size:15px}
.qa ul{padding-left:1.2em}
.mini{display:flex;gap:10px;align-items:center;text-decoration:none;color:var(--text);padding:8px;border-radius:10px;border:1px solid var(--line);background:#fff}
.mini img{width:56px;height:56px;border-radius:6px;object-fit:cover;flex:none}
.mini span{font-size:14px;line-height:1.45}
.mini:hover{border-color:var(--primary)}
.mini-list{display:grid;gap:8px}
@media (min-width:720px){.mini-list{grid-template-columns:1fr 1fr}}
.note{background:var(--surface);border-radius:10px;padding:12px 14px;font-size:14px;color:var(--muted)}
.notice{background:var(--primary-soft);border-radius:10px;padding:14px 16px;color:var(--ink)}

/* steps */
.steps{display:grid;gap:12px;counter-reset:s;padding:0;margin:0;list-style:none}
.steps li{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px 16px 16px 56px;position:relative;counter-increment:s}
.steps li::before{content:counter(s);position:absolute;left:16px;top:16px;width:28px;height:28px;border-radius:50%;background:var(--ink);color:#fff;font-weight:700;display:grid;place-items:center;font-size:14px}
.steps b{display:block;color:var(--ink)}
@media (min-width:900px){.steps{grid-template-columns:repeat(4,1fr)}}

/* form */
.form{display:grid;gap:16px;max-width:640px}
.field label{display:block;font-weight:700;color:var(--ink);margin-bottom:6px}
.field .hint{font-size:13px;color:var(--muted);margin-top:4px}
.check{display:flex;gap:10px;align-items:flex-start;font-size:15px}
.check input{width:22px;height:22px;margin-top:3px;flex:none;accent-color:var(--primary)}
.hp{position:absolute;left:-9999px}
.msg-ok{background:var(--primary-soft);color:var(--ink);border-radius:10px;padding:16px}
.msg-err{background:var(--sale-soft);color:var(--sale);border-radius:10px;padding:12px 16px}

/* about */
.about{display:grid;gap:24px}
@media (min-width:900px){.about{grid-template-columns:360px 1fr;gap:48px;align-items:start}}
.photo{border-radius:16px;overflow:hidden}
figure{margin:0}
figcaption{font-size:13px;color:var(--caption);margin-top:6px}
.authors{display:grid;gap:12px}
@media (min-width:720px){.authors{grid-template-columns:repeat(3,1fr)}}
.author{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px}

/* points */
.soon{display:inline-block;background:var(--ink);color:#fff;border-radius:var(--tag-radius);padding:2px 10px;font-size:14px;font-weight:700}
.plan-grid{display:grid;gap:12px}
@media (min-width:900px){.plan-grid{grid-template-columns:repeat(3,1fr)}}
.plan{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px}
.plan h3{margin-bottom:4px}
.wallet{display:flex;gap:16px;flex-wrap:wrap;align-items:center}
.wallet b{font-size:28px;color:var(--ink);font-variant-numeric:tabular-nums}

/* faq */
details{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:0 16px;margin-bottom:8px}
summary{cursor:pointer;min-height:48px;display:flex;align-items:center;font-weight:700;color:var(--ink)}
details p{margin:0 0 14px}

/* footer */
.site-footer{border-top:1px solid var(--line);padding:32px 0 40px;margin-top:24px;font-size:14px;color:var(--muted)}
.site-footer .cols{display:grid;gap:16px}
.site-footer a{color:var(--muted)}
.site-footer nav{display:flex;flex-wrap:wrap;gap:4px 16px}
@media (min-width:900px){.site-footer .cols{grid-template-columns:2fr 1fr}}

@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
@media (max-width:480px){
  .trust{gap:8px}
  .trust div{padding:10px}
  .trust b{font-size:16px}
  .trust span{font-size:12px;line-height:1.4;display:block}
  .lead{font-size:16px}
}

[data-results]{scroll-margin-top:120px}
@media (min-width:720px){.toolbar .chips{flex-wrap:wrap;overflow:visible}}
@media (max-width:420px){.nav a{padding:0 7px;font-size:14px}}
[hidden]{display:none!important}
.btn-ghost{white-space:nowrap;flex:none}
.btn[disabled]{border-radius:8px}