/* 固定導覽列使用不透明底色，不取樣捲動中的背景，避免模糊合成閃爍。
   Keep the sticky header opaque; avoid filtering moving content beneath it. */
/* 共享色彩與版面尺度 / Shared colors and layout tokens. */
:root{color-scheme:dark;--ink:#e7effa;--muted:#a3b4ca;--navy:#070e1c;--blue:#77b7ff;--cyan:#8cecf1;--line:#253148;--paper:#0c1526}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:90px}body{margin:0;font-family:Arial,"Noto Sans TC","PingFang TC","Microsoft JhengHei",sans-serif;color:var(--ink);background:var(--navy);font-size:16px;line-height:1.75}a{color:inherit;text-decoration:none}a:focus-visible{outline:3px solid #1685ef;outline-offset:6px}img{display:block;max-width:100%;height:auto}.wrap{width:min(1200px,calc(100% - 80px));margin-inline:auto}.header{position:sticky;top:0;z-index:5;isolation:isolate;background:#080f1e;border-bottom:1px solid var(--line)}.nav{min-height:88px;display:flex;align-items:center;justify-content:space-between;gap:28px}.brand{display:flex;align-items:center;gap:12px;font-weight:700;letter-spacing:-.4px}.brand img{border-radius:8px}.nav nav{display:flex;gap:28px;align-items:center;font-size:14px;font-weight:600}.nav-cta{border:1px solid var(--line);padding:9px 17px;border-radius:5px}.nav a:hover,.text-link:hover{color:var(--blue)}.hero{background:var(--navy);color:white;overflow:hidden}.hero-grid{display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:35px;min-height:740px;padding-block:60px}.eyebrow{font-size:12px;font-weight:700;letter-spacing:2px;line-height:1.6;margin:0 0 22px}.hero .eyebrow,.download .eyebrow{color:var(--cyan)}h1{font-size:clamp(46px,5.2vw,72px);line-height:1.23;letter-spacing:-2px;margin:0 0 27px;font-weight:750}h1 em{font-style:normal;color:var(--cyan)}.intro{color:#c4d6e2;font-size:18px;margin-bottom:30px}.actions{display:flex;flex-wrap:wrap;align-items:center;gap:22px}.button{display:inline-flex;align-items:center;justify-content:space-between;gap:24px;border-radius:5px;padding:14px 22px;font-weight:700;transition:background .2s}.primary{background:var(--cyan);color:#07111f}.primary:hover{background:#b0f3f7}.text-link{font-size:14px}.hero-note{font-size:12px;color:#afc6d6;margin-top:24px}.hero-note span{margin:0 8px}.hero-visual{position:relative;display:flex;align-items:center;justify-content:center;gap:18px;padding-bottom:45px}.hero-shot{width:49%;border:1px solid #446477;border-radius:13px;box-shadow:0 24px 48px #0004;z-index:1}.secondary-shot{width:42%;border:1px solid #446477;border-radius:12px;margin-top:95px;box-shadow:0 24px 48px #0004}.visual-caption{position:absolute;bottom:0;left:7%;font-size:11px;letter-spacing:2.5px;color:#9bb8c9}.capabilities{border-bottom:1px solid var(--line);background:var(--paper)}.capabilities .wrap{display:grid;grid-template-columns:repeat(4,1fr);padding-block:24px;text-align:center;font-size:14px;font-weight:600}.capabilities span+span{border-left:1px solid var(--line)}.section{padding-block:96px}.section-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:35px;margin-bottom:44px}.section-heading .eyebrow{color:var(--blue)}h2{font-size:clamp(30px,3.1vw,42px);line-height:1.4;letter-spacing:-1px;margin:0}p{margin-top:0}.section-heading>p{color:var(--muted);margin:0}.features{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.features article{padding:32px;border:1px solid var(--line);border-radius:18px;background:linear-gradient(145deg,#16233b,#0d1627);transition:transform .3s,border-color .3s,box-shadow .3s}.number{font-size:14px;color:var(--blue);font-weight:700}h3{font-size:22px;line-height:1.5;margin:22px 0 14px}.features p{color:var(--muted)}.tags{font-size:13px;font-weight:600;color:#9ab8d9}.fine-print{font-size:13px;color:var(--muted);line-height:1.8;margin:24px 0 0}.screens{background:var(--paper)}.gallery{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:32px 24px}figure{margin:0;min-width:0}figure img{width:100%;border-radius:8px;background:var(--navy);transition:transform .2s}figure a:hover img{transform:translateY(-5px)}figcaption{font-size:14px;font-weight:600;margin-top:12px}figcaption span{font-size:12px;color:var(--muted);margin-right:12px}.sideload{display:grid;grid-template-columns:1fr 1fr;gap:80px;border-top:1px solid var(--line);padding-top:54px}.sideload .eyebrow{color:var(--blue)}.sideload h2{margin-bottom:24px}.sideload p{color:var(--muted)}.dark{background:var(--navy);color:white;margin-top:8px}.dark:hover{background:#17496c}.install-notes{border-left:1px solid var(--line);padding-left:44px}.install-notes h3{margin-top:0}dt{font-weight:700;margin-top:23px}dd{margin:6px 0 0;color:var(--muted);font-size:14px}.download{background:var(--navy);color:white;padding-block:76px}.download-inner{display:flex;justify-content:space-between;align-items:center;gap:40px}.download h2{font-size:40px;margin-bottom:20px}.download p{color:#afc6d6}.store-links{min-width:300px;display:grid;gap:14px}.store{display:grid;grid-template-columns:1fr auto;gap:0 32px;background:#111f34;color:var(--ink);padding:14px 24px;border-radius:6px;transition:background .2s}.store:hover{background:#1c3451}.store-label{font-size:11px;letter-spacing:1.5px}.store strong{grid-column:1;font-size:24px;line-height:1.4}.store>span:last-child{grid-column:2;grid-row:1/3;align-self:center;font-size:25px}.store-links p{font-size:12px;margin:0}.footer{display:flex;align-items:center;justify-content:space-between;gap:20px;padding-block:30px;font-size:12px}.footer .brand{font-size:14px}.skip{position:fixed;top:-100px;left:16px;background:#0c1526;padding:12px;z-index:10}.skip:focus{top:10px}
/* 小螢幕維持自然閱讀順序，不依賴 JavaScript / Preserve reading order without JavaScript. */
@media(max-width:1000px){.wrap{width:calc(100% - 48px)}.hero-grid{min-height:auto;padding-block:60px;gap:20px}.nav nav{gap:16px}.hero-note span{display:none}.hero-note{max-width:220px}.features{gap:22px}.sideload{gap:40px}.gallery{gap:24px 18px}.footer{flex-wrap:wrap}}@media(max-width:720px){.wrap{width:calc(100% - 40px)}.nav{padding-block:16px;flex-wrap:wrap;gap:14px}.nav nav{width:100%;justify-content:space-between;gap:10px;font-size:12px}.nav-cta{padding:6px 11px}.hero-grid{grid-template-columns:1fr;padding-top:46px;gap:40px}.hero-copy{max-width:520px}h1{font-size:52px}.intro{font-size:16px}.hero-note{max-width:none}.hero-visual{width:min(100%,440px);margin:auto}.hero-shot{width:48%}.secondary-shot{width:42%;margin-top:55px}.capabilities .wrap{grid-template-columns:1fr 1fr;gap:14px;padding-block:22px;font-size:12px}.capabilities span:nth-child(3){border:0}.section{padding-block:60px}.section-heading{display:block;margin-bottom:30px}.section-heading>p{margin-top:20px}.features{grid-template-columns:1fr;gap:0}.features article{padding-block:22px}.features h3{margin-top:10px}.gallery{grid-template-columns:repeat(2,minmax(0,1fr));gap:25px 14px}figcaption{font-size:12px}figcaption span{margin-right:7px}.sideload{grid-template-columns:1fr;gap:36px;padding-top:32px}.install-notes{border-left:0;border-top:1px solid var(--line);padding:28px 0 0}.download{padding-block:55px}.download-inner{display:block}.download h2{font-size:32px}.store-links{min-width:0;margin-top:30px}.footer{align-items:flex-start;flex-direction:column;gap:14px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}

/* 科技感以幾何光線建立層次，避免影片與大型動畫套件。
   Geometric light layers keep motion lightweight, without video or animation libraries. */
.hero{position:relative;isolation:isolate;background:radial-gradient(ellipse at 78% 34%,#16325d 0,transparent 55%),#070e1c}
.hero::before{content:"";position:absolute;inset:0;z-index:-1;background-image:linear-gradient(#85b7ef09 1px,transparent 1px),linear-gradient(90deg,#85b7ef09 1px,transparent 1px);background-size:64px 64px;mask-image:linear-gradient(90deg,transparent,#000)}
.hero::after{content:"";position:absolute;z-index:-1;inset:0 0 auto 40%;height:180px;background:linear-gradient(transparent,#79dfff0b,transparent);border-bottom:1px solid #92eafa27;animation:scan 8s ease-in-out infinite;pointer-events:none}
.hero-grid{min-height:760px;padding-block:78px}.hero-copy{position:relative;z-index:1}
h1{font-weight:700;letter-spacing:-2.5px}h1 em{background:linear-gradient(100deg,#a5f4ef,#70b6ff);background-clip:text;-webkit-background-clip:text;color:transparent}
.hero .eyebrow{display:inline-block;border:1px solid #84cfff35;border-radius:30px;padding:8px 15px;background:#83cfff08;font-size:11px;letter-spacing:1.7px}
.hero-visual{perspective:1200px}.hero-shot{transform:rotateY(8deg) rotateZ(-5deg);animation:float-front 7s ease-in-out infinite;box-shadow:0 30px 70px #0008,0 0 45px #5ca7ff16;border-color:#83d6ff65}
.secondary-shot{transform:rotateY(-9deg) rotateZ(5deg);animation:float-back 8s ease-in-out infinite;box-shadow:0 30px 70px #0008;border-color:#83d6ff40}
.hero-visual::before{content:"";position:absolute;inset:17% 2%;background:radial-gradient(ellipse,#458dff38,transparent 68%);z-index:-1}
.button{position:relative;overflow:hidden;transition:transform .25s,box-shadow .25s,background .25s;border-radius:8px}.primary{background:linear-gradient(110deg,#a3f0e9,#8ec4ff);box-shadow:0 6px 28px #66cfff18}
.button::after{content:"";position:absolute;inset:-60% auto -60% -50%;width:35%;transform:skewX(-22deg);background:linear-gradient(90deg,transparent,#ffffff50,transparent);transition:left .55s;pointer-events:none}
.button:hover::after{left:120%}.button:hover{transform:translateY(-3px);box-shadow:0 10px 35px #63bfff25}
.number{display:inline-flex;align-items:center;justify-content:center;width:42px;height:42px;border-radius:12px;border:1px solid #6cafff35;background:#5997fa0d}
.features article:hover{transform:translateY(-6px);border-color:#609bd780;box-shadow:0 20px 45px #0003}
.screens{background:linear-gradient(#0c1526,#070e1c);border-block:1px solid var(--line)}
figure a{display:block;border:1px solid #2f4763;border-radius:13px;overflow:hidden;box-shadow:0 12px 32px #0004;transition:transform .35s,border-color .35s}
figure a:hover{transform:translateY(-7px);border-color:#8acbff}figure a:hover img{transform:none}figure img{border-radius:0}.gallery{gap:34px 24px}
.sideload{border:1px solid var(--line);border-radius:22px;padding:48px;background:linear-gradient(130deg,#15243c,#0c1424)}.dark{background:#172e4b;border:1px solid #517397}
.download{position:relative;background:radial-gradient(ellipse at 20% 100%,#193555,transparent 60%),#090f1e;border-block:1px solid var(--line)}.store{border:1px solid #3b536e;transition:transform .25s,background .25s}.store:hover{transform:translateX(5px)}
/* 內容預設可見；只對進入視窗的元素播放一次動畫。
   Content stays visible by default; animate each element only once on entry. */
.reveal-enter{animation:reveal .7s cubic-bezier(.2,.65,.3,1) both}
@keyframes reveal{from{opacity:.15;transform:translateY(25px)}to{opacity:1;transform:translateY(0)}}
@keyframes scan{0%,100%{transform:translateY(-190px);opacity:0}15%,70%{opacity:1}85%{transform:translateY(650px);opacity:0}}
@keyframes float-front{0%,100%{transform:translateY(0) rotateY(8deg) rotateZ(-5deg)}50%{transform:translateY(-12px) rotateY(8deg) rotateZ(-5deg)}}
@keyframes float-back{0%,100%{transform:translateY(0) rotateY(-9deg) rotateZ(5deg)}50%{transform:translateY(10px) rotateY(-9deg) rotateZ(5deg)}}
.motion-paused .hero-shot,.motion-paused .secondary-shot,.motion-paused .hero::after{animation-play-state:paused}
@media(max-width:1000px){.features article{padding:24px}.sideload{padding:32px;gap:32px}}
@media(max-width:720px){.hero-grid{min-height:0;padding-block:48px}.hero::after{display:none}.hero-shot,.secondary-shot{animation:none}.features{gap:16px}.features article{padding:26px}.sideload{padding:26px;gap:25px}.gallery{gap:26px 14px}.store:hover{transform:none}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}.hero-shot,.secondary-shot{transform:none}.hero::after{display:none}}

/* 語言切換與英文長句的 RWD / Language controls and responsive English copy. */
.nav{gap:20px;flex-wrap:wrap;padding-block:14px}.nav nav{margin-left:auto}.language-switch{display:flex;gap:3px;padding:3px;border:1px solid var(--line);border-radius:8px}.language-switch[hidden]{display:none}.language-switch button{border:0;background:transparent;color:var(--muted);font:inherit;font-size:14px;padding:7px 10px;border-radius:5px;cursor:pointer;min-height:40px}.language-switch button[aria-pressed="true"]{background:#29466b;color:#fff}.language-switch button:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}html[lang="en"] h1{font-size:clamp(40px,4.5vw,64px);letter-spacing:-1.8px}html[lang="en"] h2{font-size:clamp(28px,3vw,40px)}html[lang="en"] .hero-note{max-width:none}.features article,.hero-copy{min-width:0}h1,h2,h3{overflow-wrap:break-word}
@media(max-width:1000px){.nav nav{order:3;width:100%;justify-content:space-between;margin-left:0}.language-switch{margin-left:auto}.header .nav{gap:12px}.nav nav a{font-size:14px}}
@media(max-width:720px){.nav .brand{font-size:14px;gap:8px}.nav .brand img{width:28px;height:28px}.language-switch button{padding:6px 8px}.nav nav{gap:8px;flex-wrap:wrap}.nav nav a{font-size:14px}.hero-note{line-height:1.8}html[lang="en"] h1{font-size:42px}.nav-cta{padding:6px 8px}}

/* 保留官方徽章原始比例和顏色，旁邊預留淨空。
   Preserve official badge proportions/colors and keep surrounding clear space. */
.store-links{width:330px;max-width:100%}.store{display:flex;align-items:center;justify-content:center;padding:12px 20px;min-height:92px;background:transparent;border:0;border-radius:0}.store:hover{background:transparent;transform:translateY(-2px)}.store-badge{display:block;object-fit:contain}.google-badge{width:244px;height:auto}.apple-badge{width:210px;height:auto}.store-links>.store:nth-child(2){order:-1}.store-links .sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
/* APK 使用明確入口與高對比面板，不以動畫作為唯一提示。
   Make APK discovery explicit with prominent links and a high-contrast panel. */
.nav-apk{color:var(--cyan);border-bottom:1px solid #8cecf160}.apk-hero{border:1px solid #8cecf18c;background:#112a40;color:#b5f5f3}.apk-hero:hover{background:#1b3a50}.sideload{position:relative;border:1px solid #80dce185;border-top:3px solid var(--cyan);background:radial-gradient(ellipse at 0 0,#245b724a,transparent 65%),#101e32;box-shadow:0 16px 65px #0003}.sideload h2{font-size:clamp(30px,3.2vw,44px);margin-bottom:16px}.sideload h2 em{font-style:normal;color:var(--cyan)}.sideload .sideload-lead{font-size:18px;font-weight:600;color:#e7f7ff;margin-bottom:22px}.apk-download{width:100%;max-width:350px;min-height:58px;font-size:18px}.apk-download-link{display:flex;align-items:center;justify-content:space-between;gap:18px;color:#b5f5f3;border:1px solid #8cecf180;background:#163148;border-radius:8px;padding:14px 18px;font-weight:600;font-size:14px}.apk-download-link:hover{background:#21435c}
@media(max-width:720px){.store-links{width:100%}.apk-hero{font-size:14px}.sideload h2{font-size:30px}.sideload .sideload-lead{font-size:16px}.actions .button{width:100%;justify-content:space-between}.apk-download{max-width:none}}

.sideload > div:only-child{grid-column:1/-1;max-width:850px}