:root{
  --ink:#18384d;--muted:#5d7585;--ollie:#0d7d96;--ollie-dark:#075c70;
  --aqua:#dff7f6;--coral:#ffe7e1;--cream:#fff4cc;--mint:#e4f6e9;--sky:#eaf7ff;
  --line:#d8e9ee;--white:#fff;--shadow:0 18px 50px rgba(24,70,88,.10);--soft-shadow:0 10px 30px rgba(24,70,88,.07)
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:#fbfefd;color:var(--ink);font-family:Inter,"Noto Sans TC",system-ui,sans-serif;-webkit-font-smoothing:antialiased}
a:focus-visible{outline:3px solid rgba(13,125,150,.3);outline-offset:4px;border-radius:8px}
.site-header{width:min(1120px,calc(100% - 40px));margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding:22px 0}
.brand{display:flex;align-items:center;gap:11px;color:var(--ink);text-decoration:none}
.brand span{display:grid;place-items:center;width:42px;height:42px;border-radius:14px;background:var(--ollie);color:#fff;font-weight:900;box-shadow:0 8px 20px rgba(13,125,150,.2)}
.brand strong{font-size:1.02rem;letter-spacing:-.01em}
.teacher-login{color:var(--ollie-dark);font-size:.93rem;font-weight:800;text-decoration:none}
.teacher-login:hover{text-decoration:underline}
main{overflow:hidden}
.hero,.section{width:min(1120px,calc(100% - 40px));margin:0 auto}
.hero{position:relative;display:grid;grid-template-columns:minmax(0,.92fr) minmax(440px,1.08fr);gap:clamp(42px,7vw,86px);align-items:center;padding:66px 0 94px}
.hero::before{content:"";position:absolute;z-index:-1;left:-20vw;top:-170px;width:660px;height:660px;border-radius:50%;background:radial-gradient(circle,rgba(223,247,246,.9),rgba(234,247,255,.35) 58%,transparent 70%)}
.eyebrow{margin:0 0 14px;color:var(--ollie-dark);font-size:.75rem;font-weight:900;letter-spacing:.13em;text-transform:uppercase}
.eyebrow span{color:#ef8a79;margin-right:5px}
.hero h1{max-width:610px;margin:0;font-size:clamp(2.35rem,4.2vw,4rem);font-weight:900;line-height:1.18;letter-spacing:-.04em}
.hero h1 span{display:block;margin-top:10px;color:var(--ollie);font-size:.68em;line-height:1.35;letter-spacing:-.025em}
.lead{max-width:590px;margin:24px 0 28px;color:var(--muted);font-size:clamp(1rem,1.5vw,1.16rem);font-weight:650;line-height:1.85}
.actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.button{display:inline-flex;align-items:center;justify-content:center;min-height:50px;padding:0 21px;border-radius:14px;font-size:.95rem;font-weight:900;text-decoration:none;transition:transform .18s ease,box-shadow .18s ease,background .18s ease}
.button:hover{transform:translateY(-2px)}
.button.primary{background:var(--ollie);color:#fff;box-shadow:0 12px 26px rgba(13,125,150,.2)}
.button.primary:hover{background:var(--ollie-dark);box-shadow:0 15px 30px rgba(13,125,150,.25)}
.button.secondary{border:1px solid #b4d4dc;background:rgba(255,255,255,.85);color:var(--ollie-dark)}
.button.secondary:hover{background:#fff;box-shadow:var(--soft-shadow)}
.review-note{margin:14px 0 0;color:#728792;font-size:.82rem}
.workflow-visual{position:relative;padding:0 25px 31px;border:1px solid rgba(182,215,222,.85);border-radius:30px;background:rgba(255,255,255,.95);box-shadow:var(--shadow);isolation:isolate}
.workflow-visual::before,.workflow-visual::after{content:"";position:absolute;z-index:-1;border-radius:50%}
.workflow-visual::before{right:-42px;top:-38px;width:130px;height:130px;background:var(--cream);opacity:.68}
.workflow-visual::after{left:-30px;bottom:-33px;width:104px;height:104px;background:var(--coral);opacity:.65}
.visual-window-bar{height:54px;margin:0 -25px 22px;padding:0 20px;display:flex;align-items:center;gap:7px;border-bottom:1px solid #e7f0f2;color:#78909e;font-size:.72rem;font-weight:800;letter-spacing:.04em}
.visual-window-bar i{width:9px;height:9px;border-radius:50%;background:#bfdde2}
.visual-window-bar i:first-child{background:#f1a99d}.visual-window-bar i:nth-child(2){background:#f0d277}.visual-window-bar i:nth-child(3){background:#8ed5c0}
.visual-window-bar span{margin-left:auto}
.teacher-brief{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:12px;margin-bottom:15px}
.person{display:grid;place-items:center;width:43px;height:43px;border-radius:15px;font-size:.82rem;font-weight:950}
.teacher-person{background:var(--sky);color:#2c7195}.student-person{background:var(--coral);color:#af574a}
.teacher-brief div,.visual-node div{display:grid;gap:3px}.teacher-brief small,.visual-node small,.assignment-note small{color:#708895;font-size:.7rem;font-weight:750}.teacher-brief strong,.visual-node strong{font-size:.89rem}
.sent-pill{padding:6px 10px;border-radius:99px;background:var(--mint);color:#35785f;font-size:.7rem;font-weight:900}
.assignment-note{position:relative;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:12px;margin:0 10px 21px;padding:19px 18px;border:1px solid #cbe6eb;border-radius:20px;background:linear-gradient(135deg,#f1fbff,#effbf8);box-shadow:0 8px 22px rgba(31,95,113,.07)}
.assignment-note div{display:grid;gap:5px}.assignment-note strong{font-size:1.16rem;color:var(--ollie-dark)}
.quote-mark{align-self:start;color:#65b5c4;font-family:Georgia,serif;font-size:2.4rem;line-height:.8}.sparkle{color:#ef8a79;font-size:1.1rem}
.visual-flow{display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr) auto auto;align-items:center;gap:9px}
.visual-node{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:9px;min-height:70px;padding:12px;border-radius:18px;background:#f8fbfc}
.record-dot{width:10px;height:10px;border-radius:50%;background:#ee7468;box-shadow:0 0 0 5px rgba(238,116,104,.13)}
.voice-icon{display:flex;align-items:center;justify-content:center;gap:2px;width:42px;height:42px;border-radius:14px;background:var(--cream)}
.voice-icon i{display:block;width:3px;border-radius:99px;background:#ba8a28}.voice-icon i:first-child{height:10px}.voice-icon i:nth-child(2){height:20px}.voice-icon i:nth-child(3){height:15px}.voice-icon i:last-child{height:7px}
.flow-arrow{color:#87abb5;font-weight:900}.complete-badge{display:grid;justify-items:center;gap:4px;color:#347b61;font-size:.72rem}.complete-badge span{display:grid;place-items:center;width:37px;height:37px;border-radius:50%;background:var(--mint);font-size:1rem;font-weight:950}
.ocean-wave{position:absolute;right:34px;bottom:-13px;display:flex;gap:5px;padding:8px 12px;border-radius:99px;background:#fff;box-shadow:0 7px 20px rgba(24,70,88,.09)}
.ocean-wave i{width:18px;height:7px;border-bottom:2px solid #7ccbd2;border-radius:50%}
.section{padding:78px 0}
.workflow-section{width:100%;max-width:none;padding:86px max(20px,calc((100% - 1120px)/2));background:linear-gradient(180deg,#eefbfc 0,#f8fdfc 100%)}
.section-heading{display:grid;justify-items:center;text-align:center;margin:0 auto 34px}.section-heading h2,.section h2{max-width:720px;margin:0;font-size:clamp(1.85rem,3.4vw,3rem);line-height:1.28;letter-spacing:-.03em}.section-heading>p:last-child{max-width:630px;margin:16px auto 0;color:var(--muted);line-height:1.75}
.step-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:15px;max-width:1120px;margin:0 auto}
.step-card{position:relative;min-height:230px;padding:23px;border:1px solid rgba(24,70,88,.07);border-radius:23px;background:#fff;box-shadow:var(--soft-shadow);overflow:hidden}
.step-card::after{content:"";position:absolute;right:-24px;bottom:-34px;width:100px;height:100px;border-radius:50%;background:var(--accent);opacity:.75}
.step-aqua{--accent:var(--aqua)}.step-coral{--accent:var(--coral)}.step-cream{--accent:var(--cream)}.step-mint{--accent:var(--mint)}
.step-top{display:flex;align-items:center;justify-content:space-between}.step-number{display:grid;place-items:center;width:31px;height:31px;border-radius:11px;background:var(--accent);color:var(--ink);font-size:.8rem;font-weight:950}.step-symbol{display:grid;place-items:center;width:44px;height:44px;border-radius:15px;background:var(--accent);color:var(--ollie-dark);font-size:1.05rem;font-weight:950}.mic-symbol{color:#e06e60;font-size:.8rem}
.step-card h3{margin:25px 0 9px;font-size:1.08rem}.step-card p{position:relative;z-index:1;margin:0;color:var(--muted);font-size:.92rem;line-height:1.72}
.audience{padding-top:90px}.audience>.eyebrow,.audience>h2{text-align:center;margin-left:auto;margin-right:auto}.audience>h2{margin-bottom:31px}
.card-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:15px}.card-grid article{padding:24px;border:1px solid var(--line);border-radius:22px;background:#fff;box-shadow:var(--soft-shadow);transition:transform .18s ease}.card-grid article:hover{transform:translateY(-3px)}.card-grid article>span{display:grid;place-items:center;width:47px;height:47px;border-radius:16px;background:var(--sky);font-size:1.45rem}.card-grid article:nth-child(2)>span{background:var(--coral)}.card-grid article:nth-child(3)>span{background:var(--cream)}.card-grid article:nth-child(4)>span{background:var(--mint)}
.card-grid h3{margin:17px 0 9px;font-size:1.05rem;line-height:1.45}.card-grid p,.problem-copy p,.cta>p{color:var(--muted);font-size:.94rem;line-height:1.75}
.problem{display:grid;grid-template-columns:.9fr 1.1fr;gap:70px;padding:82px 54px;border:1px solid var(--line);border-radius:30px;background:linear-gradient(135deg,#fff,#fffaf0);box-shadow:var(--soft-shadow)}.problem h2{font-size:clamp(1.8rem,3vw,2.65rem)}.problem-copy{max-width:560px}.problem-copy p:first-child{margin-top:0}
.cta{position:relative;text-align:center}.cta::before{content:"";position:absolute;z-index:-1;inset:35px 12%;border-radius:50%;background:radial-gradient(ellipse,rgba(223,247,246,.85),transparent 68%)}.cta h2,.cta>p{margin-left:auto;margin-right:auto}.cta h2{margin-bottom:15px}.cta>p{max-width:650px}.cta .button{margin-top:10px}
footer{width:min(1120px,calc(100% - 40px));margin:0 auto;padding:34px 0 48px;border-top:1px solid var(--line);display:flex;justify-content:space-between;color:var(--muted);font-size:.9rem}footer a{color:var(--ink);font-weight:900;text-decoration:none}
@media(max-width:960px){.hero{grid-template-columns:1fr;gap:48px;padding-top:45px}.hero-copy{max-width:720px}.workflow-visual{max-width:680px;width:100%;margin:0 auto}.step-grid,.card-grid{grid-template-columns:1fr 1fr}.problem{grid-template-columns:1fr;gap:18px;padding:55px 38px}}
@media(max-width:620px){.site-header{width:min(100% - 30px,1120px);align-items:flex-start}.brand strong{font-size:.95rem}.teacher-login{max-width:145px;text-align:right;font-size:.82rem;line-height:1.45}.hero,.section{width:min(100% - 30px,1120px)}.hero{padding:36px 0 68px;gap:40px}.hero h1{font-size:2.28rem;line-height:1.2}.hero h1 span{font-size:.66em;margin-top:9px}.lead br{display:none}.actions{display:grid}.button{width:100%}.workflow-visual{padding:0 16px 24px;border-radius:24px}.visual-window-bar{height:48px;margin:0 -16px 18px;padding:0 15px}.teacher-brief{grid-template-columns:auto 1fr}.sent-pill{display:none}.assignment-note{margin:0 0 14px;padding:16px 13px}.visual-flow{grid-template-columns:1fr auto 1fr}.visual-node{grid-template-columns:auto 1fr;min-height:64px;padding:9px}.visual-node .record-dot{display:none}.voice-icon{width:37px;height:37px}.visual-node strong{font-size:.75rem}.flow-arrow:nth-of-type(2),.complete-badge{display:none}.ocean-wave{right:23px}.workflow-section{width:100%;padding:65px 15px}.section-heading{margin-bottom:26px}.section-heading h2 br{display:none}.step-grid,.card-grid{grid-template-columns:1fr}.step-card{min-height:0}.section{padding:62px 0}.audience{padding-top:72px}.problem{padding:38px 24px;border-radius:24px}.cta::before{inset:30px 0}footer{width:min(100% - 30px,1120px);display:grid;gap:8px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}.button,.card-grid article{transition:none}}