/* 168VIP-AI 簡單版官網 — 排版參照獲客啟動營頁（大字 → 卡片 → 單一 CTA）
   品牌色依 v1.3；支援深／淺主題切換 */

:root{
  --navy:#030B16; --blue:#2D8DDA; --ice:#EAF2FA; --slate:#587086; --cloud:#F2F5F8;
  --bg:#FFFFFF; --bg-alt:#F6F9FC; --text:#12202F; --muted:#5A6B7D;
  --border:rgba(3,11,22,.10); --border-soft:rgba(3,11,22,.06);
  --card:#FFFFFF;
  --shadow:0 6px 22px rgba(3,11,22,.06);
  --shadow-lg:0 14px 40px rgba(3,11,22,.10);
  --font-zh:"Noto Sans TC","PingFang TC","Microsoft JhengHei",sans-serif;
  --font-latin:"Avenir Next","Helvetica Neue",Arial,sans-serif;
}
[data-theme="dark"]{
  --bg:#0B1119; --bg-alt:#111A24; --text:#EAF2FA; --muted:rgba(234,242,250,.66);
  --border:rgba(234,242,250,.14); --border-soft:rgba(234,242,250,.07);
  --card:#151F2B; --cloud:#16212C;
  --shadow:0 6px 22px rgba(0,0,0,.35);
  --shadow-lg:0 14px 40px rgba(0,0,0,.45);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-zh); background:var(--bg); color:var(--text);
  line-height:1.8; -webkit-font-smoothing:antialiased;
  transition:background .3s ease,color .3s ease;
}
a{color:var(--blue);text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:1080px;margin:0 auto;padding:0 28px}

h1,h2,h3,h4{font-weight:900;line-height:1.25;letter-spacing:-.01em}
.eyebrow{
  font-family:var(--font-latin); font-size:12px; font-weight:700;
  letter-spacing:.16em; text-transform:uppercase; color:var(--blue); margin-bottom:14px;
}
.section{padding:84px 0;border-top:1px solid var(--border-soft)}
.section.alt{background:var(--bg-alt)}
.h2{font-size:clamp(26px,3.6vw,38px);margin-bottom:12px}
.sub{color:var(--muted);font-size:17px;max-width:720px;margin-bottom:38px}
.turn{
  font-size:clamp(18px,2.4vw,24px); font-weight:900; color:var(--text);
  max-width:760px; margin:0 auto 14px; text-align:center;
}
.turn-sub{text-align:center;color:var(--muted);font-size:16px;max-width:700px;margin:0 auto 42px}

/* ── nav ── */
nav{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.88); backdrop-filter:saturate(1.3) blur(12px);
  border-bottom:1px solid var(--border-soft);
}
[data-theme="dark"] nav{background:rgba(11,17,25,.88)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
.brand{display:flex;align-items:center;gap:10px;font-weight:900;font-size:16px;white-space:nowrap}
.brand img{height:26px;width:auto}
.menu{display:flex;gap:20px;flex-wrap:wrap}
.menu a{color:var(--muted);font-size:14px}
.menu a:hover{color:var(--blue)}
.nav-actions{display:flex;align-items:center;gap:10px}
.theme-toggle,.menu-toggle{
  font-family:var(--font-zh); font-size:13px; color:var(--muted);
  background:transparent; border:1px solid var(--border);
  padding:7px 14px; border-radius:999px; cursor:pointer;
}
.menu-toggle{display:none;width:42px;height:38px;border-radius:10px;font-size:18px;padding:0}
/* logo 深／淺底兩版自動切換 */
.logo-dark{display:none}
[data-theme="dark"] .logo-light{display:none}
[data-theme="dark"] .logo-dark{display:block}

/* ── hero ── */
.hero{
  padding:96px 0 84px;
  background:radial-gradient(60% 70% at 85% 0%,rgba(45,141,218,.10),transparent 60%),var(--bg);
}
.hero .kicker{font-size:clamp(17px,2.2vw,21px);font-weight:700;color:var(--muted);margin-bottom:16px}
.hero h1{font-size:clamp(34px,5.4vw,58px);line-height:1.2;margin-bottom:20px}
.hero h1 .accent{color:var(--blue)}
.hero .lede{font-size:18px;color:var(--muted);max-width:680px;margin-bottom:32px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.btn{
  display:inline-block;font-size:16px;font-weight:700;padding:15px 32px;
  border-radius:13px;cursor:pointer;transition:transform .2s,box-shadow .2s;
}
.btn-primary{background:var(--blue);color:#fff;box-shadow:var(--shadow)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}
.btn-ghost{border:1.5px solid var(--border);color:var(--text)}
.btn-ghost:hover{border-color:var(--blue);color:var(--blue)}

/* ── 信任錨數據 ── */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px}
.stat{
  background:var(--card);border:1px solid var(--border-soft);border-radius:16px;
  padding:26px 24px;box-shadow:var(--shadow);
}
.stat .num{font-family:var(--font-latin);font-size:40px;font-weight:900;color:var(--blue);line-height:1.1}
.stat .num small{font-size:20px;margin-left:2px}
.stat h4{font-size:16px;margin:10px 0 8px}
.stat p{font-size:14px;color:var(--muted);line-height:1.7}
.src{
  font-size:12.5px;color:var(--muted);margin-top:26px;text-align:center;line-height:1.9;
}
.src b{color:var(--text);font-weight:700}

/* ── 痛點 ── */
.pain-group{margin-bottom:52px}
.pain-group:last-child{margin-bottom:0}
.pain-title{
  display:flex;align-items:center;gap:12px;margin-bottom:22px;
  font-size:19px;font-weight:900;
}
.pain-title .tag{
  font-size:12px;font-weight:700;color:var(--blue);
  background:rgba(45,141,218,.10);padding:5px 13px;border-radius:999px;
  white-space:nowrap;
}
.pain-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(290px,1fr));gap:18px}
.pain{
  background:var(--card);border:1px solid var(--border-soft);border-radius:16px;
  padding:22px 22px 20px;box-shadow:var(--shadow);transition:transform .2s,box-shadow .2s;
}
.pain:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.pain h4{font-size:16.5px;margin-bottom:9px;line-height:1.5}
.pain p{font-size:14.5px;color:var(--muted);line-height:1.75}
.pain .cost{
  display:block;margin-top:12px;padding-top:12px;border-top:1px dashed var(--border);
  font-size:13.5px;color:var(--slate);
}
[data-theme="dark"] .pain .cost{color:rgba(234,242,250,.60)}
.pain .cost b{color:var(--blue);font-weight:700}

/* ── 運用場景 tabs ── */
.tabs{
  display:flex;gap:10px;flex-wrap:wrap;margin-bottom:32px;
  padding-bottom:6px;overflow-x:auto;-webkit-overflow-scrolling:touch;
}
.tab{
  font-family:var(--font-zh);font-size:15px;font-weight:700;color:var(--muted);
  background:var(--card);border:1px solid var(--border);
  padding:11px 20px;border-radius:999px;cursor:pointer;white-space:nowrap;
  transition:all .2s;
}
.tab:hover{border-color:var(--blue);color:var(--blue)}
.tab.active{background:var(--blue);border-color:var(--blue);color:#fff}
.panel{display:none}
.panel.active{display:block;animation:fade .28s ease}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.use-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:18px}
.use{
  background:var(--card);border:1px solid var(--border-soft);border-radius:16px;
  padding:22px;box-shadow:var(--shadow);
}
.use h4{font-size:17px;margin-bottom:14px;padding-bottom:12px;border-bottom:1px solid var(--border-soft)}
.use dl{display:grid;gap:9px}
.use .row{display:grid;grid-template-columns:64px 1fr;gap:12px;align-items:start;font-size:14.5px}
.use .row dt{
  font-size:12px;font-weight:700;color:var(--blue);
  background:rgba(45,141,218,.10);border-radius:7px;text-align:center;padding:3px 0;
}
.use .row dd{color:var(--muted);line-height:1.7}
.use .row dd.get{color:var(--text);font-weight:500}

/* ── 步驟 ── */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:22px}
.step{
  background:var(--card);border:1px solid var(--border-soft);border-radius:18px;
  padding:30px 26px;box-shadow:var(--shadow);position:relative;
}
.step .no{
  font-family:var(--font-latin);font-size:38px;font-weight:900;
  color:rgba(45,141,218,.22);line-height:1;margin-bottom:12px;
}
.step h4{font-size:19px;margin-bottom:10px}
.step p{font-size:15px;color:var(--muted);line-height:1.8}
.note{
  margin-top:34px;padding:22px 26px;border-radius:14px;
  background:rgba(45,141,218,.06);border:1px solid rgba(45,141,218,.16);
  font-size:15px;color:var(--text);line-height:1.85;
}

/* ── footer ── */
footer{background:var(--navy);color:#EAF2FA;padding:64px 0 40px;margin-top:0}
[data-theme="dark"] footer{background:#060C14}
footer h3{font-size:24px;margin-bottom:12px}
footer .fsub{color:rgba(234,242,250,.68);font-size:15.5px;max-width:600px;margin-bottom:26px}
.f-cta{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:38px}
.f-cta .btn-primary{background:#fff;color:var(--navy)}
.f-cta .btn-ghost{border-color:rgba(234,242,250,.35);color:#EAF2FA}
.f-cta .btn-ghost:hover{border-color:#fff;color:#fff}
.f-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:24px;padding-top:30px;border-top:1px solid rgba(234,242,250,.14)}
.f-col h5{font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:rgba(234,242,250,.55);margin-bottom:12px;font-weight:700}
.f-col a,.f-col span{display:block;font-size:14.5px;color:rgba(234,242,250,.85);margin-bottom:8px}
.f-col a:hover{color:#fff}
.f-col span.soon{color:rgba(234,242,250,.42);cursor:default}
.copyright{margin-top:34px;padding-top:22px;border-top:1px solid rgba(234,242,250,.12);font-size:13px;color:rgba(234,242,250,.5)}

/* ── 響應式 ── */
@media (max-width:820px){
  .menu{
    display:none;position:absolute;top:64px;left:0;right:0;
    flex-direction:column;gap:0;background:var(--bg);
    border-bottom:1px solid var(--border);padding:8px 28px 18px;
  }
  .menu.open{display:flex}
  .menu a{padding:12px 0;border-bottom:1px solid var(--border-soft)}
  .menu-toggle{display:block}
  .hero{padding:64px 0 56px}
  .section{padding:60px 0}
  .wrap{padding:0 20px}
  .use .row{grid-template-columns:58px 1fr;gap:10px}
}

/* ── 痛點組圖與圖示 ── */
.pain-hero{
  margin:0 0 24px;border-radius:18px;overflow:hidden;
  box-shadow:var(--shadow);position:relative;background:var(--bg-alt);
  aspect-ratio:21/9;
}
.pain-hero img{width:100%;height:100%;object-fit:cover;display:block;clip-path:inset(0 0 7% 0)}

.pain-title{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:22px;font-size:19px;font-weight:900}
.pain-title .tag{margin:0}
.pain-title .ic{width:26px;height:26px;color:var(--blue);flex-shrink:0}
.pain-title .pain-label{flex:1;min-width:200px}

.pain-head{
  display:flex;align-items:center;justify-content:space-between;
  margin-bottom:10px;padding-bottom:10px;border-bottom:1px dashed var(--border);
}
.pain .ic{width:22px;height:22px;color:var(--blue);flex-shrink:0}
.pain .num{font-family:var(--font-latin);font-size:12px;font-weight:700;color:var(--muted);letter-spacing:.14em}

/* ── 怎麼開始組圖 ── */
.start-hero{margin:0 auto 36px;max-width:620px;border-radius:18px;overflow:hidden;box-shadow:var(--shadow-lg);background:var(--navy);position:relative}
/* 浮水印已在壓圖時裁掉，不需 clip-path */
.start-hero img{width:100%;display:block}
.start-hero figcaption{margin:0;padding:12px 18px;text-align:center;font-size:13.5px;color:rgba(234,242,250,.85);background:var(--navy)}

/* ── 響應式（圖示/組圖） ── */
@media (max-width:820px){
  .pain-hero{aspect-ratio:16/8;border-radius:14px;margin-bottom:18px}
  .start-hero{max-width:100%;border-radius:14px}
  .pain-title{font-size:17px;gap:10px}
  .pain-title .ic{width:22px;height:22px}
  .pain .ic{width:20px;height:20px}
  .pain-head{margin-bottom:8px;padding-bottom:8px}
}

/* ── 痛點輪播 ── */
.carousel{position:relative}
.carousel-track{
  display:flex;gap:18px;overflow-x:auto;
  scroll-snap-type:x mandatory;scroll-behavior:smooth;
  -webkit-overflow-scrolling:touch;
  padding:4px 2px 10px;scrollbar-width:none;
}
.carousel-track::-webkit-scrollbar{display:none}
.carousel-track > .pain{
  flex:0 0 calc((100% - 36px) / 3);
  scroll-snap-align:start;padding:0;overflow:hidden;
}
.carousel-track > .pain:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}

.pain-fig{margin:0;overflow:hidden;background:var(--bg-alt);aspect-ratio:16/10}
.pain-fig img{width:100%;height:100%;object-fit:cover;display:block}
.pain-body{padding:18px 20px 20px}

.carousel-arrow{
  position:absolute;top:38%;transform:translateY(-50%);z-index:2;
  width:44px;height:44px;border-radius:50%;
  border:1px solid var(--border);background:var(--card);color:var(--text);
  font-size:26px;line-height:1;cursor:pointer;box-shadow:var(--shadow);
  display:flex;align-items:center;justify-content:center;
  transition:transform .2s,border-color .2s,color .2s,opacity .2s;
}
.carousel-arrow:hover:not(:disabled){border-color:var(--blue);color:var(--blue);transform:translateY(-50%) scale(1.06)}
.carousel-arrow:disabled{opacity:.3;cursor:default}
.carousel-arrow.prev{left:-16px}
.carousel-arrow.next{right:-16px}

.carousel-dots{display:flex;justify-content:center;gap:9px;margin-top:20px}
.carousel-dot{
  width:9px;height:9px;padding:0;border-radius:50%;
  border:1px solid var(--border);background:transparent;cursor:pointer;
  transition:background .2s,border-color .2s,transform .2s;
}
.carousel-dot:hover{border-color:var(--blue)}
.carousel-dot.active{background:var(--blue);border-color:var(--blue);transform:scale(1.3)}

@media (max-width:1024px){
  .carousel-track > .pain{flex:0 0 calc((100% - 18px) / 2)}
}
@media (max-width:640px){
  .carousel-track > .pain{flex:0 0 100%}
  .carousel-arrow{display:none}
  .pain-fig{aspect-ratio:16/9}
}