:root{--brand:#256d6a;--brand2:#d7eeec;--ink:#17201f;--muted:#5e6b69;--bg:#f7f8fa;--card:#fff;--line:#d8e1df;--shadow:0 20px 60px rgba(23,32,31,.12)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,"Noto Sans TC","Noto Sans JP",system-ui,-apple-system,sans-serif;color:var(--ink);background:var(--bg);line-height:1.65}a{color:inherit}.wrap{width:min(1160px,calc(100% - 40px));margin:auto}.topbar{position:sticky;top:0;z-index:20;background:rgba(247,248,250,.9);backdrop-filter:blur(16px);border-bottom:1px solid rgba(216,225,223,.8)}.nav{height:72px;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{display:flex;align-items:center;gap:12px;font-weight:800}.brand img{width:42px;height:42px;border-radius:12px}.nav-right{display:flex;align-items:center;gap:10px}.lang{border:1px solid var(--line);border-radius:12px;padding:8px 10px;background:#fff;color:var(--ink)}.hero{padding:76px 0 54px;overflow:hidden}.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;align-items:center;gap:56px}.eyebrow{display:inline-flex;align-items:center;gap:8px;background:var(--brand2);color:var(--brand);font-weight:800;padding:7px 12px;border-radius:999px}.hero h1{font-size:clamp(42px,6vw,76px);line-height:1.05;margin:18px 0 16px;letter-spacing:-.04em}.lead{font-size:clamp(18px,2.2vw,24px);color:var(--muted);max-width:670px}.actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:48px;padding:12px 18px;border-radius:14px;text-decoration:none;font-weight:800;border:1px solid var(--line);background:#fff}.btn.primary{background:var(--brand);color:#fff;border-color:var(--brand)}.btn.disabled{opacity:.72}.devices{position:relative;height:610px}.phone,.tablet{position:absolute;overflow:hidden;background:#111;border:10px solid #111;box-shadow:var(--shadow)}.phone{width:250px;height:544px;border-radius:42px;left:16px;top:22px;transform:rotate(-6deg)}.tablet{width:440px;height:586px;border-radius:32px;right:-100px;top:0;transform:rotate(5deg)}.phone img,.tablet img{width:100%;height:100%;object-fit:cover}.section{padding:72px 0}.section h2{font-size:clamp(30px,4vw,48px);margin:0 0 12px;letter-spacing:-.025em}.section-lead{color:var(--muted);max-width:760px;font-size:19px}.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:34px}.card{background:var(--card);border:1px solid var(--line);border-radius:22px;padding:24px;box-shadow:0 8px 30px rgba(23,32,31,.05)}.card .ico{width:48px;height:48px;border-radius:14px;background:var(--brand2);display:grid;place-items:center;color:var(--brand);font-size:24px}.card h3{margin:16px 0 8px;font-size:22px}.card p{margin:0;color:var(--muted)}.gallery-section{padding-top:36px}.gallery{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:0}.gallery img{width:100%;border-radius:22px;box-shadow:var(--shadow);border:1px solid var(--line)}.modes{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-top:32px}.mode{padding:30px;border-radius:24px;border:1px solid var(--line);background:#fff}.mode strong{font-size:24px}.storebox{background:linear-gradient(135deg,#163f3d,#256d6a);color:#fff;border-radius:32px;padding:44px;display:grid;grid-template-columns:1fr auto;align-items:center;gap:28px}.storebox p{color:rgba(255,255,255,.8);margin:8px 0 0}.storebox .btn{background:#fff;color:var(--ink);border-color:#fff}.footer{padding:38px 0 54px;color:var(--muted);border-top:1px solid var(--line)}.footer-row{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}.toast{position:fixed;left:50%;bottom:28px;transform:translateX(-50%) translateY(20px);background:#17201f;color:#fff;padding:12px 18px;border-radius:12px;opacity:0;pointer-events:none;transition:.25s;z-index:50}.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
@media(max-width:900px){.hero-grid{grid-template-columns:1fr}.devices{height:530px}.tablet{right:-160px}.feature-grid{grid-template-columns:1fr 1fr}.gallery{grid-template-columns:1fr 1fr}.storebox{grid-template-columns:1fr}}
@media(max-width:620px){.wrap{width:min(100% - 24px,1160px)}.nav{height:64px}.brand span{display:none}.hero{padding-top:44px}.devices{height:480px}.phone{width:210px;height:458px;left:0}.tablet{width:340px;height:452px;right:-170px}.feature-grid,.modes{grid-template-columns:1fr}.gallery{grid-template-columns:1fr 1fr;gap:10px}.storebox{padding:28px}.nav-right .btn{display:none}}

.footer-links{display:flex;gap:18px;flex-wrap:wrap}.brand-link{text-decoration:none}
.nav{height:96px}.brand img{width:80px;height:80px}

.feature-card-link{display:block;color:inherit;text-decoration:none;transition:transform .18s ease,box-shadow .18s ease}.feature-card-link:hover{transform:translateY(-3px);box-shadow:var(--shadow)}.feature-card-link:focus-visible{outline:4px solid var(--brand2);outline-offset:4px}
.feature-page .topbar{position:sticky}.feature-hero{padding:64px 0 34px}.feature-hero-grid{display:grid;grid-template-columns:.95fr 1.05fr;align-items:start;gap:46px}.feature-hero h1{font-size:clamp(40px,6vw,72px);line-height:1.06;margin:18px 0 16px;letter-spacing:-.035em}.feature-hero-media{display:grid;grid-template-columns:.82fr 1fr;gap:16px;align-items:end}.hero-shot{position:relative;margin:0;border:1px solid var(--line);border-radius:24px;background:#fff;overflow:hidden;box-shadow:var(--shadow)}.hero-shot.small{transform:translateY(42px)}.hero-shot img{display:block;width:100%;height:100%;object-fit:cover}.hero-shot-label{position:absolute;right:12px;top:12px;z-index:2;max-width:calc(100% - 24px);border:1px solid rgba(255,255,255,.72);border-radius:999px;background:rgba(23,32,31,.9);color:#fff;padding:5px 10px;font-size:12px;font-weight:900;line-height:1.2;box-shadow:0 6px 16px rgba(23,32,31,.2)}.hero-shot figcaption{padding:12px 14px;color:var(--muted);font-size:13px;font-weight:800}.feature-highlights{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:30px}.feature-highlights div{border:1px solid var(--line);border-radius:18px;background:#fff;padding:16px}.feature-highlights strong{display:block;margin-bottom:4px;color:var(--brand);font-size:20px}.feature-highlights span{display:block;color:var(--muted);font-size:14px}
.feature-hero-media{grid-template-columns:1fr 1fr;align-items:start;justify-self:start;width:100%;max-width:none;margin-top:60px}.hero-shot-phone img{height:clamp(390px,27vw,500px);object-position:top center}.hero-shot-wide{grid-column:1/-1}.hero-shot-wide img{height:clamp(240px,16vw,320px);object-position:center 28%}
.hero-shot-student img{object-position:center 36%}
.live-layout{display:grid;gap:28px}.live-method{border-top:1px solid var(--line);padding-top:26px}.live-method h3{font-size:clamp(24px,3vw,34px);margin:0 0 8px}.live-method>p{max-width:760px;color:var(--muted);margin:0 0 18px}.live-flow{display:grid;gap:14px}.live-flow-row{display:grid;grid-template-columns:1fr auto 1fr auto 1fr;gap:12px;align-items:stretch}.live-flow-node{min-width:0;border:1px solid var(--line);border-radius:18px;background:#fff;padding:16px}.live-flow-node .tag{display:inline-flex;margin-bottom:8px;border-radius:999px;padding:3px 9px;background:var(--brand2);color:var(--brand);font-size:12px;font-weight:900}.live-flow-node strong{display:block;line-height:1.35}.live-flow-node span:last-child{display:block;margin-top:6px;color:var(--muted);font-size:13px}.live-flow-arrow{display:grid;place-items:center;color:var(--brand);font-weight:900}.url-pill{display:inline-flex;max-width:100%;overflow-wrap:anywhere;border-radius:999px;margin-top:10px;padding:5px 9px;background:#eef5f4;color:var(--brand);font-size:12px;font-weight:900}
.device-flow-panel{border:1px solid var(--line);border-radius:28px;background:#fff;padding:28px;box-shadow:0 14px 42px rgba(23,32,31,.06)}
.device-flow-heading{display:grid;gap:8px;margin-bottom:24px}.device-flow-heading h3{margin:0;max-width:none;width:100%;font-size:clamp(24px,3vw,34px);line-height:1.25}.device-flow-heading p{max-width:none;width:100%;margin:0;color:var(--muted)}
.device-flow-map{display:grid;grid-template-columns:minmax(150px,.72fr) 74px minmax(300px,1.22fr) 82px minmax(280px,1.08fr);gap:18px;align-items:center}
.device-step{min-width:0;margin:0}.device-step figcaption{margin-bottom:12px}.device-step figcaption strong{display:block;color:var(--brand);font-size:18px;line-height:1.3}.device-step figcaption span{display:block;margin-top:3px;color:var(--muted);font-size:13px;line-height:1.45}
.phone-shell{position:relative;width:min(100%,176px);aspect-ratio:9/18.5;margin:auto;border:8px solid #14201f;border-radius:30px;background:#14201f;box-shadow:0 16px 34px rgba(23,32,31,.18);overflow:hidden}.phone-shell:before{content:"";position:absolute;left:50%;top:6px;z-index:2;width:42px;height:5px;transform:translateX(-50%);border-radius:999px;background:#314341}.phone-shell img{display:block;width:100%;height:100%;object-fit:contain;background:#edf4f2}.marked-url-phone .local-url-target{position:absolute;left:8%;right:8%;top:84%;z-index:3;height:5.5%;border:3px solid #c1121f;border-radius:6px;box-shadow:0 0 0 2px rgba(193,18,31,.16);pointer-events:none}.device-url-note{max-width:176px;margin:10px auto 0;border:1px solid rgba(193,18,31,.32);border-radius:10px;background:#fff5f5;color:#c1121f;padding:7px 9px;font-size:12px;font-weight:900;line-height:1.35;text-align:center}
.projection-rig{width:100%;max-width:440px;margin:0 auto}.projection-rig.compact{max-width:380px}.projection-composite{display:block;width:100%;height:auto}
.device-link,.device-branch{position:relative;display:flex;align-items:center;justify-content:center;min-height:220px;color:var(--brand);font-weight:900}.device-link:before,.device-branch:before{content:"";position:absolute;left:0;right:0;top:50%;z-index:0;height:2px;background:var(--brand)}.device-link:after{content:"";position:absolute;right:2px;top:50%;z-index:1;width:10px;height:10px;transform:translateY(-50%) rotate(-45deg);border-right:2px solid var(--brand);border-bottom:2px solid var(--brand)}.device-branch:after{content:"";position:absolute;right:0;top:20%;bottom:20%;width:2px;background:var(--brand)}.device-link span,.device-branch span{position:relative;z-index:2;border:1px solid var(--line);border-radius:999px;background:#fff;padding:5px 10px;font-size:12px;white-space:nowrap;box-shadow:0 6px 18px rgba(23,32,31,.08)}.device-link span:after{content:"";display:inline-block;width:7px;height:7px;margin-left:7px;vertical-align:1px;transform:rotate(-45deg);border-right:2px solid currentColor;border-bottom:2px solid currentColor}
.device-output-stack{display:grid;gap:24px}.device-student{display:grid;grid-template-columns:minmax(90px,138px) 1fr;gap:14px;align-items:center}.device-student figcaption{margin:0}.device-student .phone-shell{width:min(100%,138px)}
.device-flow-map-qr{grid-template-columns:minmax(138px,.7fr) 64px minmax(300px,1.35fr) 64px minmax(118px,.58fr) 42px minmax(118px,.58fr);grid-template-areas:"teacher input entry qr qrphone open student" "teacher . down . qrphone . student" "teacher . display . qrphone . student";align-items:start;row-gap:12px}.device-flow-map-qr .device-teacher{grid-area:teacher}.device-flow-map-qr .device-input-link{grid-area:input}.device-flow-map-qr .device-entry{grid-area:entry}.device-flow-map-qr .device-qr-link{grid-area:qr}.device-flow-map-qr .device-qr{grid-area:qrphone}.device-flow-map-qr .device-open-link{grid-area:open}.device-flow-map-qr .device-student{grid-area:student;display:block}.device-flow-map-qr .device-display{grid-area:display}.device-flow-map-qr .device-student figcaption{margin-bottom:12px}.device-flow-map-qr .device-qr .phone-shell,.device-flow-map-qr .device-student .phone-shell{width:min(100%,132px)}.device-down-link{grid-area:down;position:relative;display:flex;align-items:center;justify-content:center;min-height:52px;color:var(--brand);font-weight:900}.device-down-link:before{content:"";position:absolute;left:50%;top:0;bottom:6px;width:2px;background:var(--brand);transform:translateX(-50%)}.device-down-link:after{content:"";position:absolute;left:50%;bottom:4px;width:9px;height:9px;transform:translateX(-50%) rotate(45deg);border-right:2px solid var(--brand);border-bottom:2px solid var(--brand)}.device-down-link span{position:relative;z-index:1;transform:translateY(-8px);border:1px solid var(--line);border-radius:999px;background:#fff;padding:5px 10px;font-size:12px;white-space:nowrap;box-shadow:0 6px 18px rgba(23,32,31,.08)}.connection-note-panel{border:1px solid rgba(193,18,31,.24);border-left:6px solid #c1121f;border-radius:20px;background:#fff;padding:20px 22px;box-shadow:0 12px 32px rgba(23,32,31,.05)}.connection-note-panel ol{display:grid;gap:10px;margin:0;padding-left:1.35em}.connection-note-panel li{color:var(--ink);line-height:1.7}.connection-note-panel li::marker{color:#c1121f;font-weight:900}
.walkthrough-set{border-top:1px solid var(--line);padding-top:28px}.walkthrough-set h3{font-size:clamp(24px,3vw,34px);margin:0 0 8px}.walkthrough-set>p{max-width:760px;color:var(--muted);margin:0 0 20px}.walkthrough-set#student-ideas h3,.walkthrough-set#student-ideas>p{max-width:none;width:100%}.shot-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:16px;align-items:start}.feature-shot{margin:0;border:1px solid var(--line);border-radius:20px;background:#fff;overflow:hidden;align-self:start}.feature-shot a{display:block;text-decoration:none}.feature-shot-frame{height:310px;display:flex;align-items:center;justify-content:center;padding:10px;background:linear-gradient(180deg,rgba(255,255,255,.7),rgba(238,247,245,.7)),#eef4f2;overflow:hidden}.feature-shot-frame.phone-shot{height:430px}.feature-shot img{display:block;width:auto;height:auto;max-width:100%;max-height:100%;min-width:0;min-height:0;flex:0 1 auto;object-fit:contain;border-radius:10px;box-shadow:0 8px 24px rgba(23,32,31,.12)}.feature-shot figcaption{border-top:1px solid var(--line);padding:13px 14px 15px}.feature-shot strong{display:block;margin-bottom:5px;line-height:1.35}.feature-shot span{display:block;color:var(--muted);font-size:13px;line-height:1.45}.feature-shot-stack a+a .feature-shot-frame{border-top:1px solid var(--line)}.feature-shot-pair{grid-column:span 2}.feature-shot-pair-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr))}.feature-shot-pair-grid a+a .feature-shot-frame{border-left:1px solid var(--line)}
.decision-strip{display:grid;grid-template-columns:1fr 1fr;gap:18px}.decision-panel{border:1px solid var(--line);border-radius:24px;background:#fff;padding:24px}.decision-panel strong{display:block;margin-bottom:8px;font-size:22px}.decision-panel p{margin:0;color:var(--muted)}.decision-strip+.shot-grid{margin-top:20px}
.section[id],.walkthrough-set[id]{scroll-margin-top:112px}
@media(max-width:900px){.feature-hero-grid,.feature-highlights,.decision-strip{grid-template-columns:1fr}.feature-hero-media{max-width:620px}.live-flow-row{grid-template-columns:1fr}.live-flow-arrow{min-height:18px}.hero-shot.small{transform:none}}
@media(max-width:900px){.device-flow-map{grid-template-columns:1fr}.device-flow-map-qr{grid-template-areas:"teacher" "input" "entry" "down" "display" "qr" "qrphone" "open" "student"}.device-link,.device-branch{min-height:46px}.device-link:before,.device-branch:before{left:50%;right:auto;top:0;bottom:0;width:2px;height:auto}.device-link:after{left:50%;right:auto;top:auto;bottom:4px;width:9px;height:9px;transform:translateX(-50%) rotate(45deg);border-right:2px solid var(--brand);border-bottom:2px solid var(--brand)}.device-link span:after{transform:rotate(45deg);vertical-align:2px}.device-branch:after{display:none}.device-output-stack{grid-template-columns:1fr 1fr;align-items:start}.device-student{grid-template-columns:1fr}.device-student figcaption{margin-bottom:12px}.device-flow-panel{padding:22px}}
@media(max-width:620px){.feature-hero{padding-top:42px}.feature-hero-media{grid-template-columns:1fr}.feature-shot-frame,.feature-shot-frame.phone-shot{height:min(108vw,440px)}.live-flow-node{padding:14px}.shot-grid{grid-template-columns:1fr}.feature-shot-pair{grid-column:auto}.feature-shot-pair-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.feature-shot-pair-grid a+a .feature-shot-frame{border-left:1px solid var(--line);border-top:0}.device-flow-panel{padding:18px}.device-output-stack{grid-template-columns:1fr}.device-student .phone-shell,.phone-shell{width:min(100%,156px)}}
@media(max-width:900px){.feature-hero-media{width:100%;justify-self:stretch;margin-top:0}}
@media(max-width:620px){.feature-hero-media{grid-template-columns:1fr 1fr}.hero-shot-phone img{height:min(72vw,320px)}.hero-shot-wide img{height:min(42vw,210px)}}