*{box-sizing:border-box}
:root{
  --bg:#f7f9ff;--surface:#ffffff;--surface-2:#f2f6fb;--ink:#18324d;--muted:#6b7d91;
  --line:#dce7f2;--blue:#4e68e8;--blue-700:#394fc8;--green:#2f9b68;--green-soft:#eaf8ef;
  --yellow:#f3c64d;--danger:#b43b52;--shadow:0 20px 55px rgba(34,60,94,.12);--shadow-sm:0 8px 24px rgba(34,60,94,.08);
  --r-xl:28px;--r-lg:20px;--r-md:14px;--max:1180px;
}
html{scroll-behavior:smooth}
body{margin:0;background:
 radial-gradient(circle at 86% 10%,rgba(162,221,255,.18),transparent 26rem),
 radial-gradient(circle at 8% 90%,rgba(165,229,186,.15),transparent 25rem),
 var(--bg);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;line-height:1.55}
body.dark{--bg:#111827;--surface:#182235;--surface-2:#141e2d;--ink:#eef5ff;--muted:#a9b8c9;--line:#2c3a4d;--shadow:0 20px 55px rgba(0,0,0,.28);--shadow-sm:0 8px 24px rgba(0,0,0,.22)}
a{color:inherit;text-decoration:none}
img,svg{display:block;max-width:100%}
button,input,select,textarea{font:inherit}
button{color:inherit}
.skip{position:fixed;left:12px;top:-70px;z-index:999;background:#fff;color:#111;padding:10px 14px;border-radius:10px;box-shadow:var(--shadow)}
.skip:focus{top:12px}
.wrap{max-width:var(--max);margin:auto;padding-left:18px;padding-right:18px}
.site-header,.app-header{position:sticky;top:0;z-index:60;background:color-mix(in srgb,var(--surface) 90%,transparent);backdrop-filter:blur(16px);border-bottom:1px solid color-mix(in srgb,var(--line) 80%,transparent)}
.nav-wrap{max-width:var(--max);margin:auto;padding:11px 18px;display:flex;align-items:center;gap:16px}
.brand{display:flex;align-items:center;gap:10px;min-width:max-content}
.brand img{width:40px;height:40px;border-radius:13px}
.brand-word b{display:block;line-height:1;font-size:.98rem}.brand-word small{display:block;color:var(--muted);font-size:.65rem;font-weight:800;letter-spacing:.08em}
.main-nav,.app-nav{display:flex;align-items:center;gap:5px;margin-left:auto}
.nav-link,.nav-button{border:0;background:transparent;padding:9px 10px;border-radius:10px;font-size:.85rem;font-weight:780;color:var(--muted);cursor:pointer}
.nav-link:hover,.nav-button:hover,.nav-link[aria-current="page"]{background:var(--surface-2);color:var(--ink)}
.nav-actions{display:flex;align-items:center;gap:8px}
.btn{border:0;border-radius:12px;padding:10px 14px;font-weight:850;display:inline-flex;align-items:center;justify-content:center;gap:7px;cursor:pointer;transition:transform .16s ease,background .16s ease,box-shadow .16s ease}
.btn:hover{transform:translateY(-1px)}
.btn:focus-visible,.icon-btn:focus-visible,.nav-link:focus-visible,.nav-button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid #f3ca54;outline-offset:2px}
.btn-primary{background:var(--blue);color:#fff;box-shadow:0 10px 24px rgba(78,104,232,.22)}
.btn-primary:hover{background:var(--blue-700)}
.btn-secondary{background:var(--surface);border:1px solid var(--line);color:var(--ink)}
.btn-soft{background:var(--surface-2);border:1px solid var(--line)}
.icon-btn{width:40px;height:40px;padding:0}
.menu-btn{display:none}
.badge{display:inline-flex;align-items:center;gap:7px;padding:7px 10px;background:var(--surface);border:1px solid var(--line);border-radius:999px;font-size:.76rem;font-weight:850;color:#42617e}
.dark .badge{color:#cfe0ef}
.hero{padding:64px 0 44px}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:center}
.hero h1{font-size:clamp(2.7rem,6vw,5.25rem);line-height:.98;letter-spacing:-.055em;margin:16px 0 20px}
.hero h1 .green{color:var(--green);position:relative;display:inline-block}
.hero h1 .green:after{content:"";position:absolute;left:5%;right:3%;height:8px;bottom:-5px;background:var(--yellow);border-radius:999px;z-index:-1;transform:rotate(-1deg)}
.hero p{font-size:1.06rem;color:var(--muted);max-width:650px;margin:0 0 22px}
.hero-actions{display:flex;gap:10px;flex-wrap:wrap;margin:24px 0 16px}
.trust{display:flex;gap:13px;flex-wrap:wrap;font-size:.78rem;color:var(--muted);font-weight:760}
.hero-art{position:relative;min-height:525px;display:grid;place-items:center}
.hero-circle{width:min(500px,95%);aspect-ratio:1;border-radius:50%;background:linear-gradient(145deg,#e8f5ff,#eef9e8);border:12px solid rgba(255,255,255,.76);box-shadow:var(--shadow),inset 0 0 0 1px #d7e8f3;display:grid;place-items:center;overflow:visible}
.dark .hero-circle{border-color:rgba(255,255,255,.08)}
.hero-turtle{width:auto;height:88%;max-width:385px;object-fit:contain;filter:drop-shadow(0 18px 18px rgba(39,68,76,.14))}
.float-card{position:absolute;background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow-sm);border-radius:16px;padding:10px 12px;font-size:.76rem;font-weight:850}
.float-card.one{right:0;top:17%}.float-card.two{left:0;bottom:16%}
.section{padding:66px 0}
.section-head{text-align:center;max-width:740px;margin:0 auto 28px}
.section-head h2{font-size:clamp(1.9rem,4vw,3rem);line-height:1.08;letter-spacing:-.035em;margin:0 0 10px}
.section-head p{margin:0;color:var(--muted)}
.cards-4{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.cards-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow-sm);padding:20px}
.card .emoji{font-size:24px}.card h3{font-size:1rem;margin:10px 0 5px}.card p{margin:0;color:var(--muted);font-size:.86rem}
.step-num{width:36px;height:36px;border-radius:11px;display:grid;place-items:center;background:#edf1ff;color:var(--blue);font-weight:900}
.parent-box{display:grid;grid-template-columns:1fr 1fr;gap:24px;background:linear-gradient(145deg,#eef7ff,#eefaf2);border:1px solid #dce9e2;border-radius:28px;padding:30px}
.dark .parent-box{background:linear-gradient(145deg,#172537,#182c25);border-color:var(--line)}
.checks{display:grid;gap:9px}.check{display:flex;gap:9px;align-items:flex-start}.check strong{color:var(--green)}
.cta{background:linear-gradient(135deg,#4e68e8,#5f7cf0 55%,#3aa573);color:#fff;border-radius:30px;padding:38px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.cta h2{font-size:clamp(1.8rem,4vw,3rem);margin:0 0 8px}.cta p{margin:0;color:#ebf0ff}
.page-hero{padding:56px 0 30px;text-align:center}.page-hero h1{font-size:clamp(2.2rem,5vw,4rem);margin:10px 0;letter-spacing:-.045em}.page-hero p{color:var(--muted);max-width:720px;margin:0 auto}
.price-card{max-width:760px;margin:0 auto;background:var(--surface);border:1px solid var(--line);border-radius:26px;padding:28px;box-shadow:var(--shadow);text-align:center}.price-card .price{font-size:3rem;font-weight:900;margin:10px 0}.price-list{display:grid;gap:8px;text-align:left;max-width:470px;margin:20px auto}
.faq-list{max-width:820px;margin:0 auto;display:grid;gap:10px}details{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:0 16px}summary{cursor:pointer;list-style:none;padding:16px 0;display:flex;justify-content:space-between;gap:12px;font-weight:850}summary::-webkit-details-marker{display:none}summary:after{content:"+";color:var(--blue);font-size:1.2rem}details[open] summary:after{content:"–"}details p{color:var(--muted);margin:0 0 16px}
.legal{max-width:820px;margin:auto;padding:50px 18px}.legal h1{font-size:clamp(2.2rem,5vw,3.7rem);letter-spacing:-.04em}.legal h2{margin-top:28px}.legal p,.legal li{color:var(--muted)}
.form-shell{min-height:calc(100vh - 70px);display:grid;place-items:center;padding:34px 18px}.form-card{width:min(590px,100%);background:var(--surface);border:1px solid var(--line);border-radius:26px;padding:28px;box-shadow:var(--shadow)}.form-card h1{margin:0 0 7px;font-size:2.15rem}.form-card>p{color:var(--muted)}
.form-grid{display:grid;gap:13px}.field label{display:block;font-size:.8rem;font-weight:850;margin-bottom:6px}.field input,.field select,.field textarea{width:100%;border:1px solid #cad8e5;background:var(--surface-2);color:var(--ink);border-radius:13px;padding:11px 12px;outline:none}.notice{padding:12px 13px;border-radius:14px;background:#fff8e8;border:1px solid #eed99a;color:#6f5717;font-size:.84rem;line-height:1.5}.dark .notice{background:#332b19;border-color:#5a4d2c;color:#ecd98f}
footer{border-top:1px solid var(--line);margin-top:58px;background:color-mix(in srgb,var(--surface) 74%,transparent)}.footer-grid{max-width:var(--max);margin:auto;padding:34px 18px;display:grid;grid-template-columns:1.5fr repeat(3,1fr);gap:28px}.footer-col b{display:block;margin-bottom:8px}.footer-col a{display:block;color:var(--muted);font-size:.86rem;padding:4px 0}.footer-brand p{color:var(--muted);font-size:.86rem;max-width:280px}.copyright{max-width:var(--max);margin:auto;padding:0 18px 26px;color:var(--muted);font-size:.76rem}

/* app */
.app-header .nav-wrap{max-width:none}.app-nav{margin-left:16px}.profile-button{margin-left:auto}.app-shell{display:grid;grid-template-columns:225px 1fr;min-height:calc(100vh - 63px)}.sidebar{border-right:1px solid var(--line);background:color-mix(in srgb,var(--surface) 70%,transparent);padding:17px 13px;position:sticky;top:63px;height:calc(100vh - 63px);overflow:auto}.side-title{margin:12px 8px 7px;font-size:.7rem;text-transform:uppercase;letter-spacing:.09em;color:var(--muted);font-weight:900}.side-link{display:flex;align-items:center;gap:8px;width:100%;padding:10px;border:0;border-radius:11px;background:transparent;color:var(--muted);font-weight:780;text-align:left;cursor:pointer}.side-link:hover,.side-link.active{background:var(--surface);color:var(--ink);box-shadow:var(--shadow-sm)}.app-main{padding:25px;min-width:0}.app-title{display:flex;justify-content:space-between;align-items:flex-start;gap:18px;margin-bottom:20px}.app-title h1{font-size:2.15rem;letter-spacing:-.035em;margin:0}.app-title p{color:var(--muted);margin:5px 0 0}.mode-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.mode-card{background:var(--surface);border:1px solid var(--line);border-radius:20px;padding:18px;box-shadow:var(--shadow-sm)}.mode-card .mode-icon{width:44px;height:44px;border-radius:14px;display:grid;place-items:center;background:var(--surface-2);font-size:22px}.mode-card h3{margin:11px 0 4px}.mode-card p{margin:0;color:var(--muted);font-size:.84rem}.dashboard-grid{display:grid;grid-template-columns:1.35fr .65fr;gap:16px;margin-top:18px}.panel{background:var(--surface);border:1px solid var(--line);border-radius:20px;padding:18px;box-shadow:var(--shadow-sm)}.panel-head{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-bottom:12px}.panel-head h2{font-size:1rem;margin:0}.empty{border:1px dashed #bdcad8;border-radius:15px;padding:27px;text-align:center;color:var(--muted);background:var(--surface-2)}.stats{display:grid;grid-template-columns:1fr 1fr;gap:10px}.stat{background:var(--surface-2);border:1px solid var(--line);border-radius:14px;padding:12px}.stat b{display:block;font-size:1.4rem}.stat span{font-size:.72rem;color:var(--muted)}
.chat-layout{display:grid;grid-template-columns:250px minmax(0,1fr);gap:14px;min-height:680px}.history{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:13px}.history-list{display:grid;gap:7px}.history-item{width:100%;border:1px solid var(--line);background:var(--surface-2);border-radius:11px;padding:9px 10px;text-align:left;cursor:pointer;font-size:.8rem;font-weight:760}.chat-box{background:var(--surface);border:1px solid var(--line);border-radius:18px;display:flex;flex-direction:column;overflow:hidden}.chat-head{padding:13px 15px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;gap:10px;align-items:center}.messages{flex:1;overflow:auto;padding:18px;display:flex;flex-direction:column;gap:12px}.welcome-chat{text-align:center;margin:auto;color:var(--muted);max-width:480px}.welcome-chat .turtle-small{width:115px;margin:0 auto 10px}.message{display:flex;gap:8px;max-width:80%}.message.user{align-self:flex-end;flex-direction:row-reverse}.bubble{padding:11px 13px;border-radius:15px;background:#eef8f2;border:1px solid #d5eadc;white-space:pre-wrap}.user .bubble{background:#eef3ff;border-color:#d6def8}.speaker{border:0;background:transparent;color:var(--blue);cursor:pointer;font-size:.75rem;font-weight:850;padding:4px 0}.composer{border-top:1px solid var(--line);padding:11px;display:flex;gap:8px}.composer textarea{flex:1;min-height:48px;max-height:140px;resize:vertical;border:1px solid var(--line);background:var(--surface-2);color:var(--ink);border-radius:12px;padding:10px}.typing{font-size:.78rem;color:var(--muted)}
.rig-card{background:var(--surface);border:1px solid var(--line);border-radius:22px;padding:18px;box-shadow:var(--shadow-sm);display:grid;place-items:center}.turtle-rig-host{width:min(350px,100%);aspect-ratio:385/580}.turtle-rig-svg{width:100%;height:100%;overflow:visible;filter:drop-shadow(0 14px 15px rgba(35,64,72,.12))}.rig-arm{transform-box:view-box;transform-origin:250px 250px}.rig-eyelids{opacity:0}.eyelid{fill:#a6c85f;stroke:#6e9446;stroke-width:1.2}.lash{fill:none;stroke:#2d371f;stroke-width:3.6;stroke-linecap:round}.mouth-shape{opacity:0}.mouth-shape.is-active{opacity:1}.turtle-rig-svg.is-blinking .rig-eyelids{opacity:1}.turtle-rig-svg.is-waving .rig-arm{animation:waveArm 1.35s ease-in-out}.turtle-rig-svg.is-speaking .rig-body-wrap{animation:talkSway 1.15s ease-in-out infinite}.turtle-rig-svg.is-speaking .rig-arm{animation:talkArm 1.6s ease-in-out infinite}
@keyframes waveArm{0%,100%{transform:rotate(0deg)}20%{transform:rotate(-8deg)}45%{transform:rotate(5deg)}70%{transform:rotate(-6deg)}}@keyframes talkSway{0%,100%{transform:translateY(0) rotate(0)}50%{transform:translateY(-1.5px) rotate(.45deg)}}@keyframes talkArm{0%,100%{transform:rotate(0)}50%{transform:rotate(-2.8deg)}}
.voice-grid{display:grid;grid-template-columns:minmax(320px,.85fr) minmax(360px,1.15fr);gap:18px}.voice-controls{background:var(--surface);border:1px solid var(--line);border-radius:22px;padding:20px;box-shadow:var(--shadow-sm)}.voice-controls textarea{width:100%;min-height:110px;resize:vertical;border:1px solid var(--line);border-radius:13px;background:var(--surface-2);color:var(--ink);padding:11px}.voice-grid2{display:grid;grid-template-columns:1fr 1fr;gap:10px}.status{margin-top:14px;padding:12px 13px;border:1px solid var(--line);border-radius:13px;background:var(--surface-2);font-size:.84rem;font-weight:760}.status.loading{background:#fff8e9;border-color:#edd493;color:#6d5517}.status.speaking{background:#effaf4;border-color:#b9e2ca;color:#1d6842}.status.error{background:#fff1f1;border-color:#efc1c1;color:#902d2d}.progress{height:7px;background:#ebf0f5;border-radius:999px;overflow:hidden;margin-top:9px}.progress i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--blue),var(--green));transition:width .16s ease}.readout{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:12px}.metric{background:var(--surface-2);border:1px solid var(--line);border-radius:12px;padding:9px;text-align:center}.metric small{display:block;color:var(--muted);font-size:.66rem;font-weight:850}.metric b{font-size:1rem}
.classroom-grid{display:grid;grid-template-columns:280px minmax(0,1fr);gap:16px}.board{background:var(--surface);border:1px solid var(--line);border-radius:21px;min-height:560px;padding:20px;box-shadow:var(--shadow-sm)}.board-label{text-transform:uppercase;letter-spacing:.08em;font-size:.72rem;color:var(--muted);font-weight:900}.board h2{font-size:2rem}.lesson{border-left:4px solid var(--blue);background:var(--surface-2);border-radius:0 14px 14px 0;padding:14px;margin-top:16px}
.focus-wrap{max-width:760px;margin:auto}.timer-card{text-align:center;background:var(--surface);border:1px solid var(--line);border-radius:24px;padding:28px;box-shadow:var(--shadow-sm)}.timer{font-size:clamp(3rem,10vw,6rem);font-weight:900;letter-spacing:-.055em;margin:12px 0}.timer-options{display:flex;justify-content:center;gap:8px;flex-wrap:wrap}.timer-options button{border:1px solid var(--line);background:var(--surface-2);border-radius:999px;padding:7px 10px;font-weight:800;cursor:pointer}
.profile-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:16px}.avatar{width:86px;height:86px;border-radius:50%;background:linear-gradient(145deg,#dff7e8,#e7f1ff);display:grid;place-items:center;font-size:38px;margin:0 auto 12px}.profile-summary{text-align:center}

@media(max-width:1020px){.cards-4,.mode-grid{grid-template-columns:repeat(2,1fr)}.hero-grid{gap:24px}.dashboard-grid{grid-template-columns:1fr}.classroom-grid{grid-template-columns:230px 1fr}}
@media(max-width:840px){.main-nav{display:none;position:absolute;left:14px;right:14px;top:64px;background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:8px;box-shadow:var(--shadow);flex-direction:column;align-items:stretch}.main-nav.open{display:flex}.menu-btn{display:inline-flex}.nav-actions .hide-mobile{display:none}.hero-grid{grid-template-columns:1fr}.hero-art{min-height:445px}.hero-circle{width:min(430px,92%)}.cards-3,.parent-box{grid-template-columns:1fr}.footer-grid{grid-template-columns:1.3fr 1fr 1fr}.footer-col:last-child{grid-column:2/4}.app-shell{grid-template-columns:1fr}.sidebar{display:none}.app-main{padding:18px}.app-nav{display:none}.chat-layout{grid-template-columns:1fr}.history{display:none}.classroom-grid,.voice-grid,.profile-grid{grid-template-columns:1fr}}
@media(max-width:560px){.nav-wrap{padding:10px 12px}.brand-word small{display:none}.nav-actions .btn-primary{display:none}.hero{padding-top:40px}.hero h1{font-size:2.7rem}.hero p{font-size:.98rem}.hero-actions .btn{width:100%}.hero-art{min-height:365px}.hero-circle{width:min(350px,94%)}.hero-turtle{height:85%;max-width:300px}.float-card{display:none}.cards-4,.mode-grid{grid-template-columns:1fr}.cta{display:block;padding:25px}.cta .btn{margin-top:15px;width:100%}.footer-grid{grid-template-columns:1fr 1fr}.footer-brand{grid-column:1/-1}.footer-col:last-child{grid-column:auto}.app-main{padding:14px}.app-title{display:block}.app-title .btn{margin-top:10px}.message{max-width:92%}.voice-grid2,.readout{grid-template-columns:1fr}.composer{align-items:flex-end}.composer .btn{padding:10px 12px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation:none!important;transition:none!important}}