/* ==========================================================================
   長順織襪 CHANG SHUN — socksmit.com
   ========================================================================== */

:root{
  --ink:#1c1b19;
  --ink-soft:#4a4741;
  --ink-mute:#7d7870;
  --line:#e3ded4;
  --line-soft:#efeae1;
  --paper:#fbf9f5;
  --paper-2:#f4f0e8;
  --white:#ffffff;
  --accent:#8a5a2b;        /* 棕金 — 棉紗、工藝 */
  --accent-deep:#6d4620;
  --accent-soft:#f3e9dc;
  --line-green:#06c755;
  --fb-blue:#1877f2;
  --maxw:1180px;
  --radius:4px;
  --shadow:0 1px 2px rgba(28,27,25,.04),0 8px 24px rgba(28,27,25,.06);
  --serif:"Noto Serif TC","Songti TC","PingFang TC","Microsoft JhengHei",serif;
  --sans:"Noto Sans TC","PingFang TC","Microsoft JhengHei","Helvetica Neue",Arial,sans-serif;
}

*,*::before,*::after{box-sizing:border-box}

html{scroll-behavior:smooth}

body{
  margin:0;
  font-family:var(--sans);
  font-size:16px;
  line-height:1.9;
  color:var(--ink);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
  letter-spacing:.02em;
}

img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.narrow{max-width:800px;margin-left:auto;margin-right:auto}

/* ---------- 標題 ---------- */
h1,h2,h3,h4{font-family:var(--serif);font-weight:600;line-height:1.4;letter-spacing:.04em;margin:0}

.eyebrow{
  font-size:12px;letter-spacing:.28em;text-transform:uppercase;
  color:var(--accent);font-weight:600;margin:0 0 14px;font-family:var(--sans);
}

.section-title{font-size:clamp(24px,3.4vw,34px);margin-bottom:16px}
.section-lead{color:var(--ink-soft);font-size:16px;margin:0 auto;max-width:640px}

.section{padding:clamp(64px,9vw,110px) 0}
.section--tint{background:var(--paper-2)}
.section--ink{background:var(--ink);color:#efe9df}
.section--ink .section-lead{color:#b9b1a4}
.section--ink .eyebrow{color:#c9a377}

.center{text-align:center}

.rule{width:44px;height:2px;background:var(--accent);margin:20px auto 0}
.rule--left{margin-left:0}

/* ---------- 頁首 ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(251,249,245,.94);
  backdrop-filter:saturate(1.4) blur(10px);
  border-bottom:1px solid var(--line);
}
.header-inner{display:flex;align-items:center;gap:24px;height:74px}

.brand{display:flex;align-items:center;gap:12px;flex-shrink:0}
.brand img{height:38px;width:auto}
.brand-text{line-height:1.15}
.brand-cn{font-family:var(--serif);font-size:18px;font-weight:600;letter-spacing:.1em;display:block}
.brand-en{font-size:9.5px;letter-spacing:.26em;color:var(--ink-mute);display:block}

.nav{margin-left:auto;display:flex;align-items:center;gap:22px;white-space:nowrap}
.nav > .btn-row{display:none}
.nav a{
  font-size:14.5px;color:var(--ink-soft);position:relative;padding:6px 0;
  transition:color .18s;
}
.nav a::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1.5px;
  background:var(--accent);transform:scaleX(0);transform-origin:left;
  transition:transform .22s ease;
}
.nav a:hover{color:var(--ink)}
.nav a:hover::after,.nav a.is-active::after{transform:scaleX(1)}
.nav a.is-active{color:var(--ink);font-weight:500}

.header-cta{display:flex;gap:8px;margin-left:8px}

.nav-toggle{
  display:none;margin-left:auto;background:none;border:1px solid var(--line);
  border-radius:var(--radius);width:42px;height:42px;cursor:pointer;
  align-items:center;justify-content:center;
}
.nav-toggle span,.nav-toggle span::before,.nav-toggle span::after{
  content:"";display:block;width:18px;height:1.5px;background:var(--ink);
  transition:transform .22s,opacity .18s;
}
.nav-toggle span{position:relative}
.nav-toggle span::before{position:absolute;top:-6px}
.nav-toggle span::after{position:absolute;top:6px}
.nav-toggle[aria-expanded="true"] span{background:transparent}
.nav-toggle[aria-expanded="true"] span::before{transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span::after{transform:translateY(-6px) rotate(-45deg)}

/* ---------- 按鈕 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:999px;font-size:14.5px;font-weight:500;
  border:1px solid transparent;cursor:pointer;transition:all .2s ease;
  font-family:var(--sans);letter-spacing:.04em;white-space:nowrap;
}
.btn svg{width:17px;height:17px;flex-shrink:0}
.btn--line{background:var(--line-green);color:#fff}
.btn--line:hover{background:#05b34c;transform:translateY(-1px)}
.btn--fb{background:var(--fb-blue);color:#fff}
.btn--fb:hover{background:#1568d8;transform:translateY(-1px)}
.btn--ghost{border-color:var(--line);color:var(--ink-soft);background:var(--white)}
.btn--ghost:hover{border-color:var(--accent);color:var(--accent)}
.btn--sm{padding:9px 16px;font-size:13px}
.btn--lg{padding:15px 30px;font-size:16px}

.btn-row{display:flex;flex-wrap:wrap;gap:12px}
.btn-row--center{justify-content:center}

/* ---------- Hero ---------- */
.hero{
  position:relative;background:var(--ink);color:#f2ece2;overflow:hidden;
  padding:clamp(80px,13vw,150px) 0 clamp(70px,11vw,120px);
}
.hero::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(120% 80% at 78% 18%,rgba(190,140,80,.20),transparent 60%);
}
.hero-inner{position:relative;z-index:1;display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.hero-en{
  font-family:var(--serif);font-size:13px;letter-spacing:.42em;
  color:#c9a377;margin:0 0 18px;
}
.hero h1{font-size:clamp(38px,5.6vw,62px);letter-spacing:.1em;margin-bottom:22px}
.hero p{color:#c3bbae;font-size:17px;max-width:30em;margin:0 0 34px}
.hero-figure{border-radius:var(--radius);overflow:hidden;box-shadow:0 30px 60px rgba(0,0,0,.35)}
.hero-figure img{width:100%;height:100%;object-fit:cover;aspect-ratio:4/3}

.hero-stats{
  display:flex;gap:40px;margin-top:38px;padding-top:30px;
  border-top:1px solid rgba(255,255,255,.14);flex-wrap:wrap;
}
.hero-stats .num{font-family:var(--serif);font-size:30px;color:#fff;display:block;line-height:1.2}
.hero-stats .lbl{font-size:12.5px;color:#a49b8d;letter-spacing:.12em}

/* ---------- 頁首橫幅（內頁） ---------- */
.page-head{background:var(--ink);color:#f2ece2;padding:clamp(56px,8vw,90px) 0 clamp(48px,7vw,72px);text-align:center}
.page-head h1{font-size:clamp(28px,4.4vw,44px);letter-spacing:.12em}
.page-head .en{font-size:11.5px;letter-spacing:.36em;color:#c9a377;margin:0 0 14px;font-family:var(--sans);text-transform:uppercase}
.page-head p{color:#b9b1a4;margin:18px auto 0;max-width:600px;font-size:15.5px}

/* ---------- 卡片與格線 ---------- */
.grid{display:grid;gap:24px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}

.card{
  background:var(--white);border:1px solid var(--line-soft);border-radius:var(--radius);
  padding:32px 28px;box-shadow:var(--shadow);
}
.card h3{font-size:19px;margin-bottom:12px}
.card p{color:var(--ink-soft);font-size:15px;margin:0}
.card .idx{
  font-family:var(--serif);font-size:13px;color:var(--accent);
  letter-spacing:.2em;display:block;margin-bottom:14px;
}

/* ---------- 圖片格 ---------- */
.tile{
  position:relative;overflow:hidden;border-radius:var(--radius);
  background:var(--paper-2);aspect-ratio:1/1;
}
.tile img{width:100%;height:100%;object-fit:cover;transition:transform .5s cubic-bezier(.2,.7,.3,1)}
.tile:hover img{transform:scale(1.05)}

.figure-caption{font-size:13px;color:var(--ink-mute);margin-top:10px;text-align:center}

/* ---------- 影片 ---------- */
.video-frame{
  position:relative;padding-bottom:56.25%;height:0;overflow:hidden;
  border-radius:var(--radius);background:#000;box-shadow:var(--shadow);
}
.video-frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0}

/* ---------- 兩欄圖文 ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:clamp(32px,5vw,64px);align-items:center}
.split--reverse .split-media{order:2}
.split-body h2{font-size:clamp(22px,3vw,30px);margin-bottom:18px}
.split-body p{color:var(--ink-soft);margin:0 0 16px}
.split-media img{border-radius:var(--radius);width:100%}

/* ---------- 文章段落 ---------- */
.prose p{color:var(--ink-soft);margin:0 0 20px;font-size:16px;line-height:2.05}
.prose p:last-child{margin-bottom:0}
.prose strong{color:var(--ink);font-weight:600}
.pull{
  font-family:var(--serif);font-size:clamp(19px,2.6vw,25px);line-height:1.8;
  color:var(--ink);border-left:2px solid var(--accent);padding:6px 0 6px 24px;
  margin:36px 0;letter-spacing:.04em;
}

/* ---------- 製程流程 ---------- */
.flow{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;align-items:center}
.flow li{
  list-style:none;background:var(--white);border:1px solid var(--line);
  border-radius:999px;padding:10px 22px;font-size:15px;letter-spacing:.08em;
}
.flow .sep{color:var(--accent);font-size:13px}

/* ---------- 年表 ---------- */
.timeline{list-style:none;margin:0;padding:0;position:relative}
.timeline::before{
  content:"";position:absolute;left:74px;top:6px;bottom:6px;width:1px;background:var(--line);
}
.timeline li{position:relative;padding:0 0 26px 108px;min-height:32px}
.timeline li:last-child{padding-bottom:0}
.timeline .yr{
  position:absolute;left:0;top:0;width:56px;text-align:right;
  font-family:var(--serif);font-size:16px;color:var(--accent);font-weight:600;
}
.timeline li::after{
  content:"";position:absolute;left:70px;top:9px;width:9px;height:9px;
  border-radius:50%;background:var(--paper);border:2px solid var(--accent);
}
.timeline .txt{color:var(--ink-soft);font-size:15.5px}
.timeline li.is-key .txt{color:var(--ink);font-weight:500}

/* ---------- FAQ ---------- */
.faq{border-top:1px solid var(--line)}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{
  list-style:none;cursor:pointer;padding:26px 44px 26px 0;position:relative;
  font-family:var(--serif);font-size:18px;letter-spacing:.04em;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{
  content:"";position:absolute;right:8px;top:50%;width:9px;height:9px;
  border-right:1.5px solid var(--accent);border-bottom:1.5px solid var(--accent);
  transform:translateY(-70%) rotate(45deg);transition:transform .22s;
}
.faq details[open] summary::after{transform:translateY(-30%) rotate(-135deg)}
.faq .answer{padding:0 0 28px;color:var(--ink-soft)}
.faq .answer p{margin:0 0 14px}
.faq .answer ol{margin:0;padding-left:20px}
.faq .answer li{margin-bottom:8px}

/* ---------- 認證條 ---------- */
.badges{display:flex;flex-wrap:wrap;gap:14px;justify-content:center}
.badge{
  border:1px solid var(--line);background:var(--white);border-radius:999px;
  padding:10px 20px;font-size:14px;color:var(--ink-soft);letter-spacing:.06em;
}
.badge b{color:var(--accent);font-weight:600}

/* ---------- 標籤 ---------- */
.tags{display:flex;flex-wrap:wrap;gap:9px}
.tag{
  background:var(--accent-soft);color:var(--accent-deep);border-radius:999px;
  padding:8px 16px;font-size:14px;letter-spacing:.05em;
}
.tag--plain{background:var(--white);border:1px solid var(--line);color:var(--ink-soft)}

/* ---------- CTA 區塊 ---------- */
.cta{background:var(--accent-soft);text-align:center}
.cta h2{font-size:clamp(22px,3.2vw,32px);margin-bottom:14px}
.cta p{color:var(--ink-soft);margin:0 auto 30px;max-width:520px}

/* ---------- 聯絡資訊 ---------- */
.info-list{list-style:none;margin:0;padding:0}
.info-list li{display:flex;gap:16px;padding:18px 0;border-bottom:1px solid var(--line-soft)}
.info-list li:last-child{border-bottom:0}
.info-list .k{
  flex:0 0 92px;font-size:13px;color:var(--ink-mute);letter-spacing:.14em;padding-top:3px;
}
.info-list .v{font-size:16px;color:var(--ink)}
.info-list .v small{display:block;font-size:13px;color:var(--ink-mute);margin-top:3px;letter-spacing:0}
.info-list a:hover{color:var(--accent)}

.qr-card{background:var(--white);border:1px solid var(--line-soft);border-radius:var(--radius);padding:28px;text-align:center;box-shadow:var(--shadow)}
.qr-card img{margin:0 auto;max-width:190px}
.qr-card p{font-size:14px;color:var(--ink-mute);margin:16px 0 0}

/* ---------- 頁尾 ---------- */
.site-footer{background:var(--ink);color:#a49b8d;padding:70px 0 34px;font-size:14.5px}
.footer-top{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:44px;padding-bottom:44px;border-bottom:1px solid rgba(255,255,255,.1)}
.site-footer h4{color:#f2ece2;font-size:15px;letter-spacing:.14em;margin-bottom:18px}
.footer-motto{font-family:var(--serif);font-size:21px;color:#f2ece2;letter-spacing:.14em;margin:0 0 14px}
.site-footer ul{list-style:none;margin:0;padding:0}
.site-footer li{margin-bottom:11px;line-height:1.7}
.site-footer a:hover{color:#f2ece2}
.footer-bottom{padding-top:26px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13px;color:#7d7568}

/* ---------- 浮動聯絡鈕（手機） ---------- */
.float-cta{display:none}

/* ---------- 動效 ---------- */
.js .reveal{opacity:0;transform:translateY(18px);transition:opacity .7s ease,transform .7s cubic-bezier(.2,.7,.3,1)}
.js .reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  .js .reveal{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
}

/* ==========================================================================
   RWD
   ========================================================================== */
@media (max-width:1080px) and (min-width:801px){
  .nav{gap:16px}
  .nav a{font-size:13.5px}
  .brand-en{display:none}
}

@media (max-width:960px){
  .hero-inner{grid-template-columns:1fr;gap:40px}
  .hero-figure{order:-1}
  .split{grid-template-columns:1fr}
  .split--reverse .split-media{order:0}
  .grid-4{grid-template-columns:repeat(3,1fr)}
  .footer-top{grid-template-columns:1fr 1fr;gap:32px}
}

@media (max-width:800px){
  .nav-toggle{display:flex}
  .header-cta{display:none}
  .nav{
    position:fixed;inset:74px 0 auto 0;background:var(--paper);
    flex-direction:column;align-items:stretch;gap:0;padding:8px 24px 24px;
    border-bottom:1px solid var(--line);
    transform:translateY(-8px);opacity:0;pointer-events:none;
    transition:opacity .2s,transform .2s;max-height:calc(100vh - 74px);overflow:auto;
  }
  .nav.is-open{opacity:1;transform:none;pointer-events:auto}
  .nav a{padding:15px 0;border-bottom:1px solid var(--line-soft);font-size:16px}
  .nav a::after{display:none}
  .nav > .btn-row{display:flex;margin-top:18px}
  .nav .btn{flex:1}

  .float-cta{
    display:flex;position:fixed;left:0;right:0;bottom:0;z-index:40;
    background:rgba(251,249,245,.96);backdrop-filter:blur(10px);
    border-top:1px solid var(--line);padding:10px 14px;gap:10px;
  }
  .float-cta .btn{flex:1;padding:13px 10px}
  body{padding-bottom:70px}

  .grid-2,.grid-3{grid-template-columns:1fr}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .hero-stats{gap:26px}
  .timeline::before{left:8px}
  .timeline li{padding-left:40px}
  .timeline .yr{position:static;display:block;width:auto;text-align:left;margin-bottom:4px}
  .timeline li::after{left:4px;top:11px}
  .footer-top{grid-template-columns:1fr;gap:30px}
  .info-list li{flex-direction:column;gap:5px}
  .info-list .k{flex:none}
}

@media (max-width:420px){
  .grid-4{grid-template-columns:1fr 1fr}
  .brand img{height:32px}
  .brand-cn{font-size:16px}
  .wrap{padding:0 18px}
}