:root{--bg:#1c1c1e;--fg:#fff;--mut:#c7c7cc;--dim:#c7c7cc;--card:#2c2c2e;--navbg:rgba(28,28,30,.72);--line:#545458;--line2:#636366;--tag:#3a3a3c;--acc:#0a84ff;--lnk:#8ec9ff;color-scheme:dark}
html[data-theme=light]{--bg:#f5f5f7;--fg:#1d1d1f;--mut:#6e6e73;--dim:#86868b;--card:#fff;--navbg:rgba(245,245,247,.72);--line:#e8e8ed;--line2:#d2d2d7;--tag:#86868b;--acc:#0071e3;--lnk:#0071e3;color-scheme:light}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;background:var(--bg)}
body{background:var(--bg);color:var(--fg);font-family:"SF Pro TC","SF Pro Text","PingFang TC","Noto Sans CJK TC","Microsoft JhengHei","Helvetica Neue",Arial,sans-serif;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none}
nav{position:fixed;top:0;left:0;right:0;z-index:10;height:52px;display:flex;align-items:center;justify-content:space-between;padding:0 max(20px,env(safe-area-inset-left));background:var(--navbg);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid var(--line)}
nav .links{display:flex;align-items:center;gap:22px;font-size:14px;color:var(--mut)}
nav .links a.on,nav .links a:hover{color:var(--fg)}
.pill{display:inline-block;padding:11px 24px;border-radius:980px;background:var(--acc);color:#fff;font-size:15px;font-weight:500}
.pill.ghost{background:transparent;color:var(--lnk);padding:11px 8px}
.pill.sm{padding:7px 16px;font-size:13px}
.scene{min-height:100vh;padding:104px 22px 72px;display:flex;flex-direction:column;align-items:center;text-align:center}
.scene.tight{min-height:0;padding-top:96px}
.eyebrow{font-size:15px;font-weight:600;color:var(--mut);margin-bottom:10px}
h1,h2{font-weight:700;letter-spacing:-.02em;line-height:1.1}
h1{font-size:clamp(40px,9vw,88px)}
h2{font-size:clamp(32px,6.4vw,64px)}
.sub{margin-top:14px;font-size:clamp(17px,2.6vw,24px);color:var(--mut);line-height:1.4}
.ai{background:linear-gradient(90deg,#ff5e62,#ff9966,#ffd86f,#5be7a9,#4da3ff,#b07cff,#ff5e62);background-size:300% 100%;-webkit-background-clip:text;background-clip:text;color:transparent;animation:flow 6s linear infinite}
@keyframes flow{to{background-position:300% 0}}
.cta{margin-top:26px;display:flex;gap:10px;flex-wrap:wrap;justify-content:center}
.phone{margin-top:44px;width:min(300px,72vw);aspect-ratio:390/844;border-radius:46px;border:9px solid #2a2a2c;background:#1c1c1e;overflow:hidden;box-shadow:0 0 0 1px #48484a,0 40px 100px rgba(10,132,255,.25);transform:scale(.88);transition:transform .1s linear;will-change:transform}
.phone img,.phone video{display:block;width:100%;height:100%;object-fit:cover}
.pair{display:flex;gap:14px;justify-content:center;flex-wrap:nowrap}
.pair .phone{margin-top:44px;width:min(250px,42vw);border-width:6px;border-radius:34px}
@media (min-width:700px){.pair{gap:28px}.pair .phone{border-width:9px;border-radius:46px}}
.tiles{margin-top:48px;display:grid;grid-template-columns:repeat(2,1fr);gap:12px;width:min(1000px,100%)}
.tile{background:var(--card);border-radius:16px;padding:24px 18px;text-align:center;align-items:center;min-height:180px;display:flex;flex-direction:column;justify-content:flex-end}
.tile b{font-size:clamp(19px,4.6vw,26px);line-height:1.2;margin-bottom:8px}
.tile span{font-size:clamp(13px,3.6vw,15px);color:var(--mut)}
.tile i{font-style:normal;font-size:36px;margin-bottom:auto}
.cards{margin-top:48px;display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:16px;width:min(1000px,100%)}
.card{background:var(--card);border-radius:22px;padding:38px 24px 0;overflow:hidden;display:flex;flex-direction:column;align-items:center}
.card h3{font-size:34px;font-weight:700}
.card p{margin:8px 0 18px;color:var(--mut);font-size:15px}
.card .phone{margin-top:20px;width:230px;border-bottom:none;border-radius:38px 38px 0 0;transform:none;box-shadow:none}
.free{font-size:clamp(56px,14vw,140px)}
footer{padding:36px 22px 60px;text-align:center;font-size:13px;color:var(--dim)}
footer a{margin:0 10px;color:var(--mut)}
.reveal{opacity:0;transform:translateY(36px);transition:opacity .9s ease,transform .9s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}.ai{animation:none}.phone{transform:none}}
@media (min-width:900px){.phone{width:340px}}
@media (min-width:700px){.tiles{grid-template-columns:repeat(4,1fr)}.tile{padding:36px 26px;min-height:220px}}
nav .links{gap:clamp(12px,3vw,22px)}
.doc{max-width:760px;margin:0 auto;padding:96px 22px 72px;text-align:left}
.doc h1{font-size:30px;line-height:1.15;text-align:center}
.doc .sub{text-align:center;margin-bottom:26px;font-size:15px}
.chips{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin-bottom:28px}
.chip{border:1px solid var(--line2);background:transparent;color:var(--mut);border-radius:980px;padding:8px 18px;font-size:15px;cursor:pointer;font-family:inherit}
.chip.on{background:var(--acc);border-color:var(--acc);color:#fff}
.doc h2{font-size:17px;line-height:1.2;margin:32px 0 12px;letter-spacing:0}
.doc section[data-group] h2{text-align:center}
.doc .item{border-top:1px solid var(--line);padding:16px 0}
.doc .item:last-child{border-bottom:1px solid var(--line)}
.doc .item h3{font-size:15px;font-weight:600;margin-bottom:6px;display:flex;gap:8px;align-items:center}
.doc .item p,.doc .item li{color:var(--mut);font-size:15px;line-height:1.5}
.doc .item ol{padding-left:22px}
.doc details summary{cursor:pointer;font-size:15px;font-weight:600;list-style:none;display:flex;gap:8px;align-items:center}
.doc details summary::-webkit-details-marker{display:none}
.doc details summary::after{content:"+";margin-left:auto;color:var(--mut);font-size:22px}
.doc details[open] summary::after{content:"−"}
.doc details p{margin-top:8px}
.tag{font-size:12px;font-weight:500;border-radius:980px;padding:2px 9px;color:#fff;background:var(--tag);white-space:nowrap}
.tag.expense{background:#1f6f43}.tag.split{background:#8a4b12}
.empty-note{text-align:center;color:var(--mut);padding:30px 0}

.nav-r{display:flex;align-items:center;gap:10px}
.tbtn{width:32px;height:32px;border-radius:50%;border:1px solid var(--line2);background:transparent;color:var(--fg);font-size:16px;line-height:1;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;padding:0}
nav .links a,nav .pill{white-space:nowrap}
@media (max-width:520px){nav{padding:0 12px}nav .links{font-size:12.5px;gap:7px}nav .pill.sm{padding:6px 11px;font-size:12px}.nav-r{gap:6px}.tbtn{width:28px;height:28px;font-size:14px}}
nav .links a{line-height:1.4;display:inline-block;padding:4px 0}
.pill.ghost-login{background:transparent;color:var(--fg);border:1px solid var(--line2);white-space:nowrap}
@media (max-width:640px){.pill.ghost-login{padding:7px 10px}nav{padding:0 12px}.nav-r{gap:6px}}
@media (max-width:640px){.nav-r .pill.sm:not(.ghost-login){display:none}}
.doc figure{margin:14px 0 4px;text-align:center}
.doc figure img{width:min(260px,70%);height:auto;border-radius:16px;border:1px solid var(--line);display:block;margin:0 auto}
.doc figcaption{margin-top:8px;font-size:13px;line-height:1.4;color:var(--mut)}
.doc .ans p+p{margin-top:8px}.doc .ans{padding-top:8px}.doc .ans a{color:var(--lnk)}.doc details p{margin-top:0}.doc .ans ol,.doc .ans ul{margin:8px 0 0;padding-left:1.6em}.doc .ans li+li{margin-top:8px}