/* FollowCut 追影 官網共用樣式。設計準則：Apple Design for the Web（系統字體、字距隨大小調整、
   半透明材質導覽、簡潔層次、尊重減少動態／透明度／對比設定）。 */
:root{
  --bg:#ffffff; --bg2:#f5f5f7; --card:#ffffff; --text:#1d1d1f; --muted:#6e6e73; --line:rgba(0,0,0,.10);
  --accent:#0071e3; --accent-ink:#ffffff; --nav-bg:rgba(255,255,255,.78); --shadow:0 8px 30px rgba(0,0,0,.08);
  --warm:#ff9f0a; color-scheme:light;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);
  font:400 1.0625rem/1.6 -apple-system,BlinkMacSystemFont,"SF Pro Text","PingFang TC","Noto Sans TC","Microsoft JhengHei",system-ui,sans-serif;
  -webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none} a:hover{text-decoration:underline}
:focus-visible{outline:3px solid var(--accent);outline-offset:3px;border-radius:6px}
.skip{position:absolute;left:-999px;top:8px;background:var(--accent);color:#fff;padding:8px 14px;border-radius:10px;z-index:100}
.skip:focus{left:8px}

/* 導覽：半透明材質，內容從下面捲過 */
.nav{position:sticky;top:0;z-index:50;background:var(--nav-bg);
  -webkit-backdrop-filter:saturate(180%) blur(20px);backdrop-filter:saturate(180%) blur(20px);
  border-bottom:1px solid var(--line)}
.nav-in{max-width:1080px;margin:0 auto;padding:0 22px;height:52px;display:flex;align-items:center;gap:26px}
.brand{display:flex;align-items:center;gap:9px;color:var(--text);font-weight:650;letter-spacing:-.01em}
.brand img{width:26px;height:26px;border-radius:7px}
.brand:hover{text-decoration:none}
.nav-links{display:flex;gap:22px;font-size:.875rem;margin-left:auto}
.nav-links a{color:var(--muted)} .nav-links a:hover{color:var(--text);text-decoration:none}
.pill{font-size:.78rem;font-weight:600;padding:5px 12px;border-radius:999px;background:var(--accent);color:var(--accent-ink)}
@media (max-width:720px){.nav-links a.hide-s{display:none}.nav-in{gap:14px}}
@media (prefers-reduced-transparency:reduce){.nav{background:var(--bg);-webkit-backdrop-filter:none;backdrop-filter:none}}

.wrap{max-width:1080px;margin:0 auto;padding:0 22px}
.narrow{max-width:760px;margin:0 auto;padding:0 22px}

/* 字級：大標題字距收緊、行高緊；內文字距接近 0 */
h1,h2,h3{margin:0;font-weight:700}
.nw{white-space:nowrap}
.lead,.feature li,.card p{text-wrap:pretty}
.display{font-size:clamp(2.6rem,7.2vw,5.2rem);line-height:1.04;letter-spacing:-.03em}
.h2{font-size:clamp(1.9rem,4.4vw,3rem);line-height:1.1;letter-spacing:-.022em}
.h3{font-size:1.3rem;line-height:1.25;letter-spacing:-.012em}
.lead{font-size:clamp(1.1rem,2.2vw,1.45rem);line-height:1.4;color:var(--muted);letter-spacing:-.005em}
.eyebrow{font-size:.85rem;font-weight:650;color:var(--warm);letter-spacing:.02em;margin-bottom:10px}
p{margin:0 0 1em}

/* Hero */
.hero{text-align:center;padding:72px 0 40px}
.hero .icon{width:112px;height:112px;border-radius:26px;box-shadow:var(--shadow);margin-bottom:26px}
.hero .lead{max-width:640px;margin:18px auto 0}
.badges{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:26px}
.badge{font-size:.85rem;padding:7px 14px;border-radius:999px;background:var(--bg2);color:var(--text);border:1px solid var(--line)}
.badge.strong{background:var(--accent);color:var(--accent-ink);border-color:transparent;font-weight:600}
.hero-art{margin:46px auto 0;max-width:760px}
.hero-art svg{width:100%;height:auto;display:block}

/* 區塊 */
section{padding:88px 0}
.alt{background:var(--bg2)}
.section-head{text-align:center;max-width:720px;margin:0 auto 46px}
.section-head .lead{margin-top:14px}

.grid3{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:18px}
.card{background:var(--card);border:1px solid var(--line);border-radius:22px;padding:26px;box-shadow:var(--shadow)}
.card p{color:var(--muted);margin:8px 0 0;font-size:.98rem}
.card .glyph{font-size:1.9rem;line-height:1;margin-bottom:14px;display:block}

/* 功能深入：左右並排 */
.feature{display:grid;grid-template-columns:1fr 1fr;gap:54px;align-items:center;padding:34px 0}
.feature.flip .fig{order:-1}
@media (max-width:820px){.feature,.feature.flip{grid-template-columns:1fr;gap:26px}.feature.flip .fig{order:0}}
.feature ul{margin:14px 0 0;padding:0;list-style:none}
.feature li{position:relative;padding-left:26px;margin:0 0 9px;color:var(--muted)}
.feature li::before{content:"";position:absolute;left:4px;top:.72em;width:9px;height:9px;border-radius:50%;background:var(--accent)}
.feature li b{color:var(--text);font-weight:600}
.fig{background:var(--card);border:1px solid var(--line);border-radius:26px;padding:22px;box-shadow:var(--shadow)}
.fig svg{width:100%;height:auto;display:block}

.chips{display:flex;flex-wrap:wrap;gap:9px;margin-top:16px}
.chip{font-size:.88rem;padding:7px 13px;border-radius:999px;background:var(--bg2);border:1px solid var(--line);color:var(--text)}
.alt .chip{background:var(--card)}

/* 步驟 */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px;counter-reset:s}
.step{background:var(--card);border:1px solid var(--line);border-radius:22px;padding:26px 26px 26px 26px;position:relative}
.step::before{counter-increment:s;content:counter(s);display:inline-grid;place-items:center;width:34px;height:34px;border-radius:50%;
  background:var(--accent);color:var(--accent-ink);font-weight:700;margin-bottom:14px}
.step p{color:var(--muted);margin:6px 0 0;font-size:.98rem}

/* 隱私 */
.privacy-box{background:var(--card);border:1px solid var(--line);border-radius:26px;padding:34px;box-shadow:var(--shadow);display:grid;grid-template-columns:1.1fr 1fr;gap:34px;align-items:center}
@media (max-width:820px){.privacy-box{grid-template-columns:1fr;padding:26px}}
.privacy-box ul{list-style:none;margin:0;padding:0}
.privacy-box li{display:flex;gap:12px;margin:0 0 14px;color:var(--muted)}
.privacy-box li span{flex:none;width:26px;height:26px;border-radius:50%;background:var(--accent);color:var(--accent-ink);display:grid;place-items:center;font-size:.85rem;font-weight:700}
.privacy-box li b{color:var(--text)}

/* 方案預告 */
.plans{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:18px}
.plan{background:var(--card);border:1px solid var(--line);border-radius:22px;padding:26px}
.plan.now{border:2px solid var(--accent)}
.plan .tag{font-size:.78rem;font-weight:650;color:var(--muted);letter-spacing:.02em}
.plan.now .tag{color:var(--accent)}
.plan ul{margin:14px 0 0;padding-left:1.15em;color:var(--muted)}
.fineprint{font-size:.85rem;color:var(--muted);text-align:center;margin-top:20px}

/* FAQ */
details{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:0 20px;margin:0 0 10px}
summary{cursor:pointer;list-style:none;padding:17px 0;font-weight:600;letter-spacing:-.005em;display:flex;justify-content:space-between;gap:16px}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";color:var(--muted);font-size:1.4rem;line-height:1;transition:transform .25s ease}
details[open] summary::after{transform:rotate(45deg)}
details p{color:var(--muted);padding:0 0 18px;margin:0}

/* 按鈕：按下瞬間回饋 */
.btn{display:inline-block;padding:12px 24px;border-radius:999px;background:var(--accent);color:var(--accent-ink);font-weight:600;transition:transform .1s ease-out}
.btn:hover{text-decoration:none;filter:brightness(1.05)}
.btn:active{transform:scale(.97)}
.btn.ghost{background:transparent;color:var(--accent);border:1px solid var(--accent)}
.center{text-align:center}
.cta{text-align:center;padding:88px 0}
.cta .row{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:24px}

footer.site{background:var(--bg2);border-top:1px solid var(--line);padding:34px 0;color:var(--muted);font-size:.86rem}
footer.site .cols{display:flex;gap:22px;flex-wrap:wrap;justify-content:space-between;align-items:center}
footer.site a{color:var(--muted)} footer.site a:hover{color:var(--text)}
footer.site .links a{margin-right:18px}

/* 文件頁（隱私、條款、支援） */
.doc{padding:48px 0 72px}
.doc h1{font-size:clamp(2rem,5vw,2.8rem);letter-spacing:-.025em;line-height:1.1;margin-bottom:6px}
.doc .meta{color:var(--muted);font-size:.9rem;margin-bottom:28px}
.doc h2{font-size:1.25rem;letter-spacing:-.012em;margin:2.1em 0 .5em}
.doc ul{padding-left:1.25em} .doc li{margin-bottom:.4em}
.doc p,.doc li{color:var(--text)}

/* 捲動淡入：只用 opacity／transform，尊重減少動態 */
.reveal{opacity:0;transform:translateY(14px);transition:opacity .6s ease,transform .6s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  summary::after{transition:none}
}
@media (prefers-contrast:more){
  :root{--line:rgba(0,0,0,.4)} .card,.plan,.step,details,.fig,.privacy-box{border-width:2px}
}