/* Opinion Paragraph Checker — marketing site */
:root{
  --blue:#1766E8; --blue-600:#0F55CC; --blue-50:#EAF2FF; --blue-100:#D6E6FF; --sky:#7DB8FF;
  --navy:#06225F; --navy-2:#0B3A8F; --navy-3:#041845;
  --ink:#0F1E3D; --ink-2:#44526F; --ink-3:#6B7894; --line:#E3E9F4; --bg:#F5F8FD; --card:#fff;
  --green:#178A3E; --green-b:#1FA34A; --green-50:#E9F8EE; --red:#D62F2A; --orange:#F08A1C; --purple:#7E36D6; --teal:#0F8C8C; --pink:#D23C6E; --gold:#E5A400;
  --radius:18px; --shadow:0 10px 30px rgba(16,40,90,.08); --shadow-lg:0 30px 70px rgba(4,24,69,.25);
  --maxw:1180px; --gutter:clamp(16px,4vw,32px);
  --hdr:72px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--hdr) + 12px);-webkit-text-size-adjust:100%}
body{font-family:Inter,"Segoe UI",system-ui,-apple-system,sans-serif;color:var(--ink);background:#fff;line-height:1.6;overflow-x:hidden;-webkit-font-smoothing:antialiased}
img,svg{display:block;max-width:100%}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
button,input,textarea,select{font:inherit;color:inherit}
button{cursor:pointer;border:0;background:none}
:focus-visible{outline:3px solid #5AA2FF;outline-offset:3px;border-radius:6px}
.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}
.skip{position:absolute;left:12px;top:-60px;z-index:100;background:#fff;color:var(--navy);padding:10px 16px;border-radius:10px;font-weight:700;box-shadow:var(--shadow)}
.skip:focus{top:12px}
svg.i{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;flex:none}
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 var(--gutter)}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;height:52px;padding:0 24px;border-radius:14px;font-weight:700;font-size:16px;transition:transform .15s,background .2s,box-shadow .2s;white-space:nowrap;text-decoration:none!important}
.btn:active{transform:scale(.98)}
.btn-primary{background:var(--blue);color:#fff;box-shadow:0 10px 24px rgba(23,102,232,.35)}
.btn-primary:hover{background:var(--blue-600)}
.btn-light{background:#fff;color:var(--navy)}
.btn-light:hover{background:var(--blue-50)}
.btn-ghost{background:rgba(255,255,255,.1);color:#fff;border:1px solid rgba(255,255,255,.25)}
.btn-ghost:hover{background:rgba(255,255,255,.18)}
.btn-outline{border:1.5px solid var(--line);color:var(--ink);background:#fff}
.btn-outline:hover{border-color:var(--blue);color:var(--blue)}
.btn-sm{height:42px;padding:0 18px;font-size:14.5px;border-radius:12px}
.btn-block{width:100%}

/* ---------- header ---------- */
.site-header{position:fixed;inset:0 0 auto 0;z-index:50;height:var(--hdr);transition:background .25s,box-shadow .25s,backdrop-filter .25s}
.site-header.scrolled{background:rgba(4,24,69,.88);backdrop-filter:saturate(1.4) blur(14px);-webkit-backdrop-filter:saturate(1.4) blur(14px);box-shadow:0 6px 24px rgba(0,8,40,.25)}
.site-header .container{height:100%;display:flex;align-items:center;gap:24px}
.brand{display:flex;align-items:center;gap:12px;color:#fff;text-decoration:none!important;min-width:0}
.brand img{width:52px;height:auto}
.brand b{display:block;font-size:15px;line-height:1.15;white-space:nowrap}
.brand > span{display:block;min-width:0}
.brand .sub{display:block;font-size:11px;color:#9EC2FF;letter-spacing:.12em;font-weight:700;white-space:nowrap}
.nav{display:flex;align-items:center;gap:4px;margin-left:auto}
.nav a{color:#DCE8FF;font-size:14.5px;font-weight:600;padding:8px 12px;border-radius:10px;text-decoration:none}
.nav a:hover{background:rgba(255,255,255,.1);color:#fff}
.header-cta{margin-left:8px}
@media (max-width:1240px){.nav a{font-size:13.5px;padding:8px 8px;white-space:nowrap}.hero-quote{display:none}}
.menu-btn{display:none;margin-left:auto;width:44px;height:44px;border-radius:12px;color:#fff;align-items:center;justify-content:center;background:rgba(255,255,255,.1)}
.menu-btn svg{width:24px;height:24px}
@media (max-width:960px){
  .menu-btn{display:inline-flex}
  .nav{position:fixed;inset:var(--hdr) 0 auto 0;flex-direction:column;align-items:stretch;gap:2px;margin:0;padding:12px var(--gutter) 20px;background:rgba(4,24,69,.98);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-top:1px solid rgba(255,255,255,.08);transform:translateY(-8px);opacity:0;visibility:hidden;transition:opacity .2s,transform .2s,visibility .2s}
  .nav.open{opacity:1;transform:none;visibility:visible}
  .nav a{padding:13px 12px;font-size:16px}
  .header-cta{margin:10px 0 0}
  .site-header:has(.nav.open){background:rgba(4,24,69,.98)}
}

/* ---------- hero ---------- */
.hero{position:relative;color:#fff;padding:calc(var(--hdr) + 48px) 0 64px;overflow:hidden;
  background:radial-gradient(1100px 650px at 75% 5%,#1F5FD6 0%,transparent 60%),radial-gradient(900px 600px at 0% 100%,#0A3FA8 0%,transparent 60%),linear-gradient(160deg,#041845 0%,#082D7A 55%,#05205C 100%)}
.hero::after{content:"";position:absolute;inset:auto 0 -1px 0;height:120px;background:linear-gradient(to bottom,transparent,rgba(255,255,255,.0))}
.hero-grid{display:grid;grid-template-columns:1.05fr 1fr;gap:40px;align-items:end}
.hero-copy{padding-bottom:72px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;padding:7px 14px;border-radius:18px;max-width:100%;line-height:1.35;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.16);font-size:13px;font-weight:600;color:#CFE0FF}
.eyebrow i{flex:none;width:8px;height:8px;border-radius:50%;background:#5FE08A;box-shadow:0 0 0 4px rgba(95,224,138,.2)}
.hero h1{font-size:clamp(34px,5.2vw,60px);line-height:1.05;letter-spacing:-.03em;margin:20px 0 18px;font-weight:800}
.hero h1 em{font-style:normal;background:linear-gradient(90deg,#7DB8FF,#B9D8FF);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .lead{font-size:clamp(16px,1.6vw,19px);color:#C8D8F5;max-width:560px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}
.store{display:inline-flex;align-items:center;gap:12px;height:58px;padding:0 20px 0 16px;border-radius:14px;background:#000;color:#fff;border:1px solid rgba(255,255,255,.22);position:relative;text-decoration:none!important;transition:transform .15s,border-color .2s}
.store:hover{border-color:rgba(255,255,255,.5)}
.store svg{width:28px;height:28px;fill:currentColor;stroke:none}
.store small{display:block;font-size:11px;color:#C9D3E6;line-height:1.1}
.store b{display:block;font-size:18px;line-height:1.15;letter-spacing:-.01em}
.store .soon{position:absolute;top:-10px;right:-8px;background:var(--orange);color:#1C1200;font-size:11px;font-weight:800;padding:3px 9px;border-radius:999px;letter-spacing:.02em}
.hero-stats{display:flex;flex-wrap:wrap;gap:28px;margin-top:36px;padding-top:26px;border-top:1px solid rgba(255,255,255,.12)}
.hero-stats div b{display:block;font-size:26px;font-weight:800;letter-spacing:-.02em}
.hero-stats div span{font-size:13px;color:#A9C2EC}
.hero-visual{position:relative;min-height:640px;display:flex;justify-content:center;align-items:flex-end}
.hero-visual .teacher-photo{position:absolute;left:-48px;bottom:0;width:68%;max-width:400px;-webkit-mask-image:radial-gradient(ellipse 48% 58% at 56% 44%,#000 45%,transparent 100%);mask-image:radial-gradient(ellipse 48% 58% at 56% 44%,#000 45%,transparent 100%)}
.hero-visual .teacher-photo img{width:100%;height:auto}
.hero-visual .phone{position:relative;margin-left:min(48%,calc(100% - var(--pw)));z-index:2}
.hero-quote{position:absolute;left:0;top:30px;z-index:3;max-width:230px;font-style:italic;font-weight:500;font-size:17px;line-height:1.4;color:#E8F0FF;text-shadow:0 2px 12px rgba(0,20,70,.6)}
.hero-quote span{display:block;font-family:Caveat,cursive;font-style:normal;font-size:24px;color:#9EC2FF;margin-top:6px}
@media (max-width:1020px){
  .hero-grid{grid-template-columns:1fr;gap:10px}
  .hero-copy{padding-bottom:20px;text-align:center}
  .hero .lead{margin:0 auto}
  .hero-actions,.hero-stats{justify-content:center}
  .hero-visual{min-height:560px}
  .hero-visual .teacher-photo{left:50%;transform:translateX(-95%);width:340px}
  .hero-visual .phone{margin-left:200px}
  .hero-quote{display:none}
}
@media (max-width:620px){
  .hero{padding-top:calc(var(--hdr) + 28px)}
  .hero-visual{min-height:500px}
  .hero-visual .teacher-photo{display:none}
  .hero-visual .phone{margin-left:0}
  .hero-stats{gap:18px 26px}
  .store{height:54px}
}

/* ---------- phone mockups ---------- */
.phone{--pw:300px;width:var(--pw);height:calc(var(--pw)*2.05);border-radius:44px;background:#0B1022;padding:10px;position:relative;flex:none;
  box-shadow:0 40px 90px rgba(0,8,40,.45),inset 0 0 0 2px #2A3350}
.phone::before{content:"";position:absolute;top:18px;left:50%;transform:translateX(-50%);width:84px;height:24px;border-radius:20px;background:#0B1022;z-index:5}
.screen{position:relative;width:100%;height:100%;border-radius:34px;overflow:hidden;background:var(--bg);color:var(--ink);display:flex;flex-direction:column;font-size:12px;line-height:1.35}
.status{height:40px;flex:none;display:flex;align-items:center;justify-content:space-between;padding:6px 22px 0 26px;font-size:12.5px;font-weight:600}
.status .bat{width:22px;height:11px;border:1.5px solid currentColor;border-radius:4px;padding:1.5px}
.status .bat::after{content:"";display:block;height:100%;width:80%;background:currentColor;border-radius:1.5px}
.sbody{flex:1;overflow:hidden;padding:2px 13px 12px}
.shdr{display:flex;align-items:center;gap:8px;padding:4px 0 10px}
.shdr h4{font-size:15.5px;font-weight:700;flex:1;letter-spacing:-.01em}
.shdr svg{width:18px;height:18px}
.tabbar{flex:none;height:58px;background:#fff;border-top:1px solid var(--line);display:grid;grid-template-columns:repeat(4,1fr);padding:7px 4px 10px}
.tabbar span{display:flex;flex-direction:column;align-items:center;gap:3px;font-size:9px;font-weight:600;color:var(--ink-3)}
.tabbar span.on{color:var(--blue)}
.tabbar svg{width:19px;height:19px}
.mcard{background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:0 2px 10px rgba(16,40,90,.04)}
.apphead{display:flex;align-items:center;gap:8px;padding:2px 0 10px}
.apphead img{width:34px}
.apphead b{font-size:12px;display:block}
.apphead small{font-size:10px;color:var(--ink-3);display:block}
.apphead .av{margin-left:auto;width:30px;height:30px;border-radius:50%;background:var(--blue);color:#fff;display:grid;place-items:center}
.apphead .av svg{width:16px;height:16px}
.mhero{position:relative;height:122px;border-radius:15px;overflow:hidden;background:linear-gradient(120deg,#0A3FA8,#1766E8);color:#fff}
.mhero img{position:absolute;left:-8px;bottom:0;height:118%;width:auto}
.mhero p{position:absolute;right:10px;top:16px;width:56%;font-style:italic;font-weight:600;font-size:12.5px;line-height:1.35}
.mhero p span{display:block;text-align:right;font-family:Caveat,cursive;font-style:normal;font-size:16px;color:#CFE0FF;margin-top:3px}
.mstart{margin-top:11px;display:flex;align-items:center;gap:11px;background:var(--blue);color:#fff;border-radius:15px;padding:13px;box-shadow:0 8px 20px rgba(23,102,232,.35)}
.mstart .ico{width:38px;height:38px;border-radius:50%;background:rgba(255,255,255,.2);display:grid;place-items:center;flex:none}
.mstart b{font-size:13px;display:block}
.mstart small{font-size:10px;color:#D6E6FF;display:block}
.mtiles{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:10px}
.mtile{padding:11px;display:flex;flex-direction:column;gap:5px;min-height:86px}
.mtile .ti{width:28px;height:28px;border-radius:9px;display:grid;place-items:center;background:var(--blue-50);color:var(--blue)}
.mtile .ti svg{width:16px;height:16px}
.mtile b{font-size:11.5px}
.mtile small{font-size:9.5px;color:var(--ink-3)}
.mres{display:flex;align-items:center;gap:11px;padding:12px}
.ring{position:relative;width:96px;height:96px;flex:none}
.ring svg{width:96px;height:96px;transform:rotate(-90deg)}
.ring .v{position:absolute;inset:0;display:grid;place-items:center;text-align:center}
.ring .v b{display:block;font-size:25px;font-weight:800;letter-spacing:-.03em;line-height:1}
.ring .v b small{font-size:12px;color:var(--ink-3);font-weight:600}
.ring .v span{display:block;font-size:9px;color:var(--ink-3);margin-top:3px}
.ring circle.fg{transition:stroke-dashoffset 1.4s cubic-bezier(.2,.8,.2,1)}
.mverdict{background:var(--green-50);border-radius:11px;padding:9px}
.mverdict b{display:flex;align-items:center;gap:5px;color:var(--green);font-size:12px}
.mverdict b svg{width:14px;height:14px}
.mverdict p{font-size:9.5px;color:var(--ink-2);margin-top:4px}
.mcrit{padding:4px 12px 10px;margin-top:9px}
.mcrit .row{padding:6px 0}
.mcrit .row div{display:flex;justify-content:space-between;font-size:10.5px;font-weight:500}
.mcrit .track{height:5px;border-radius:5px;background:#EDF1F8;margin-top:4px;overflow:hidden}
.mcrit .track i{display:block;height:100%;border-radius:5px;width:0;transition:width 1.2s cubic-bezier(.2,.8,.2,1)}
.in-view .mcrit .track i{width:var(--w)}
.mtotal{display:flex;align-items:center;gap:8px;margin-top:9px;padding:10px 12px;background:#FFF8E6;border:1px solid #FBE7B5;border-radius:12px;font-weight:700;font-size:12px}
.mtotal svg{color:var(--gold);width:16px;height:16px}
.mtotal b{margin-left:auto}
.mchips{display:flex;gap:6px;overflow:hidden;margin-bottom:4px}
.mchip{padding:5px 10px;border-radius:999px;border:1px solid var(--line);background:#fff;font-size:10px;font-weight:600;color:var(--ink-2);white-space:nowrap}
.mchip.on{background:var(--blue);border-color:var(--blue);color:#fff}
.merr{padding:10px;margin-top:8px}
.merr .h{display:flex;align-items:center;gap:6px;font-weight:700;font-size:11.5px}
.merr .n{width:18px;height:18px;border-radius:50%;color:#fff;font-size:10px;display:grid;place-items:center}
.merr dl{margin-top:5px;font-size:10px;line-height:1.4}
.merr dt{color:var(--ink-3);margin-top:4px}
.merr dd{font-family:"JetBrains Mono",ui-monospace,monospace;font-size:9.5px}
.merr dd.bad{color:var(--red);text-decoration:line-through}
.merr dd.good{color:var(--green)}
.merr dd.why{font-family:inherit;color:var(--ink-2)}
.mprof{display:flex;align-items:center;gap:10px;padding:10px}
.mprof .ph{width:38px;height:38px;border-radius:12px;background:var(--blue);color:#fff;display:grid;place-items:center}
.mprof b{font-size:12.5px;display:block}
.mprof small{font-size:10px;color:var(--ink-3)}
.mstats{display:grid;grid-template-columns:repeat(3,1fr);gap:6px;margin-top:8px}
.mstats div{padding:9px 4px;text-align:center}
.mstats b{font-size:17px;font-weight:800;display:block}
.mstats small{font-size:9px;color:var(--ink-3)}
.mchart{padding:10px 8px 6px;margin-top:8px}
.mchart h5,.mrecent h5{font-size:11.5px;margin:0 0 4px 4px}
.mchart svg{width:100%;height:118px}
.mchart .line{stroke-dasharray:600;stroke-dashoffset:600;transition:stroke-dashoffset 1.8s ease}
.in-view .mchart .line{stroke-dashoffset:0}
.mrecent{margin-top:8px}
.mrecent .it{display:flex;gap:8px;align-items:center;padding:7px 2px;border-bottom:1px solid var(--line)}
.mrecent .it:last-child{border:0}
.mrecent .it i{width:24px;height:24px;border-radius:7px;background:var(--green-50);color:var(--green);display:grid;place-items:center;flex:none}
.mrecent .it i svg{width:13px;height:13px}
.mrecent .it b{font-size:10.5px;font-weight:600;display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:190px}
.mrecent .it small{font-size:9px;color:var(--ink-3)}

/* ---------- sections ---------- */
section{position:relative}
.section{padding:clamp(72px,9vw,120px) 0}
.section.alt{background:var(--bg)}
.section-head{text-align:center;max-width:720px;margin:0 auto clamp(36px,5vw,56px)}
.kicker{display:inline-block;font-size:13px;font-weight:800;letter-spacing:.14em;color:var(--blue);text-transform:uppercase}
.section-head h2{font-size:clamp(28px,3.6vw,44px);line-height:1.12;letter-spacing:-.025em;margin:10px 0 14px;font-weight:800}
.section-head p{color:var(--ink-2);font-size:clamp(16px,1.4vw,18px)}

/* steps */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;counter-reset:st}
.step{padding:30px 26px;border-radius:var(--radius);background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);position:relative}
.step .num{position:absolute;top:22px;right:24px;font-size:52px;font-weight:800;color:var(--blue-50);line-height:1;letter-spacing:-.04em}
.step .ic{width:56px;height:56px;border-radius:16px;background:linear-gradient(135deg,#1766E8,#4C9BFF);color:#fff;display:grid;place-items:center;box-shadow:0 10px 20px rgba(23,102,232,.3)}
.step .ic svg{width:26px;height:26px}
.step h3{font-size:20px;margin:20px 0 8px;letter-spacing:-.01em}
.step p{color:var(--ink-2);font-size:15.5px}
@media (max-width:860px){.steps{grid-template-columns:1fr}}

/* showcase */
.showcase{display:flex;gap:28px;justify-content:center;flex-wrap:wrap}
.showcase figure{display:flex;flex-direction:column;align-items:center;gap:16px}
.showcase figcaption{font-weight:700;font-size:15px;color:var(--ink-2)}
.showcase .phone{--pw:270px;box-shadow:0 30px 60px rgba(4,24,69,.22),inset 0 0 0 2px #2A3350}

/* features */
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.feature{padding:26px;border-radius:var(--radius);background:#fff;border:1px solid var(--line);transition:transform .2s,box-shadow .2s,border-color .2s}
.feature:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:var(--blue-100)}
.feature .ic{width:48px;height:48px;border-radius:14px;display:grid;place-items:center;background:var(--blue-50);color:var(--blue)}
.feature .ic svg{width:24px;height:24px}
.feature h3{font-size:18px;margin:16px 0 6px}
.feature p{color:var(--ink-2);font-size:15px}
@media (max-width:960px){.features{grid-template-columns:1fr 1fr}}
@media (max-width:620px){.features{grid-template-columns:1fr}}

/* rubric */
.rubric-wrap{display:grid;grid-template-columns:1fr 1.1fr;gap:48px;align-items:center}
.rubric{display:grid;gap:12px;list-style:none}
.rubric li{display:flex;gap:16px;align-items:flex-start;padding:16px 18px;border-radius:16px;background:#fff;border:1px solid var(--line)}
.rubric .dot{width:40px;height:40px;border-radius:12px;flex:none;display:grid;place-items:center;color:#fff;font-weight:800;font-size:15px}
.rubric b{display:block;font-size:16px}
.rubric span{color:var(--ink-2);font-size:14.5px}
.score-card{padding:32px;border-radius:24px;color:#fff;background:linear-gradient(150deg,#0B3A8F,#041845);box-shadow:var(--shadow-lg)}
.score-card h3{font-size:24px;letter-spacing:-.02em}
.score-card p{color:#C8D8F5;margin-top:8px}
.formula{margin-top:22px;padding:18px;border-radius:16px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.14);font-family:"JetBrains Mono",ui-monospace,monospace;font-size:15px;text-align:center;color:#fff}
.formula small{display:block;font-family:Inter,sans-serif;color:#A9C2EC;font-size:13px;margin-top:6px}
.levels{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:20px}
.levels div{padding:12px 8px;border-radius:12px;background:rgba(255,255,255,.06);text-align:center}
.levels b{display:block;font-size:18px}
.levels span{font-size:12px;color:#A9C2EC}
@media (max-width:960px){.rubric-wrap{grid-template-columns:1fr}}
@media (max-width:480px){.levels{grid-template-columns:1fr 1fr}}

/* demo */
.demo{display:grid;grid-template-columns:1.25fr 1fr;gap:26px;align-items:start}
.demo-text{padding:28px;border-radius:22px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow)}
.demo-text .topic{display:flex;gap:12px;align-items:center;padding-bottom:16px;margin-bottom:16px;border-bottom:1px solid var(--line)}
.demo-text .topic .ti{width:44px;height:44px;border-radius:12px;background:var(--blue-50);color:var(--blue);display:grid;place-items:center;flex:none}
.demo-text .topic b{display:block;font-size:16px;line-height:1.3}
.demo-text .topic span{font-size:13px;color:var(--ink-3)}
.demo-text p.para{font-size:17px;line-height:1.85}
.mistake{background:rgba(214,47,42,.1);border-bottom:2px solid var(--red);border-radius:4px;padding:1px 3px;cursor:pointer;color:inherit;font:inherit;transition:background .2s;display:inline;text-align:left}
.mistake[data-type="vocab"]{background:rgba(240,138,28,.12);border-color:var(--orange)}
.mistake[data-type="spelling"]{background:rgba(126,54,214,.1);border-color:var(--purple)}
.mistake[data-type="structure"]{background:rgba(15,140,140,.1);border-color:var(--teal)}
.mistake:hover,.mistake.active{background:rgba(23,102,232,.16)}
.mistake.fixed{background:var(--green-50);border-color:var(--green-b);color:var(--green)}
.demo-hint{display:flex;align-items:center;gap:8px;margin-top:18px;font-size:14px;color:var(--ink-3)}
.demo-legend{display:flex;flex-wrap:wrap;gap:8px 16px;margin-top:12px;font-size:13px;color:var(--ink-2)}
.demo-legend i{display:inline-block;width:12px;height:12px;border-radius:4px;margin-right:6px;vertical-align:-1px}
.demo-panel{position:sticky;top:calc(var(--hdr) + 20px);padding:26px;border-radius:22px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);min-height:280px}
.demo-panel .empty{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;gap:10px;color:var(--ink-3);min-height:230px}
.demo-panel .empty svg{width:40px;height:40px;color:var(--blue-100)}
.demo-panel .tag{display:inline-flex;align-items:center;gap:6px;font-size:12.5px;font-weight:700;padding:5px 11px;border-radius:999px;color:#fff}
.demo-panel dl{margin-top:16px}
.demo-panel dt{font-size:13px;color:var(--ink-3);margin-top:14px}
.demo-panel dd{font-size:16px;margin-top:3px}
.demo-panel dd.bad{font-family:"JetBrains Mono",ui-monospace,monospace;font-size:15px;color:var(--red);text-decoration:line-through}
.demo-panel dd.good{font-family:"JetBrains Mono",ui-monospace,monospace;font-size:15px;color:var(--green)}
.demo-panel .progress{display:flex;align-items:center;justify-content:space-between;margin-top:22px;padding-top:16px;border-top:1px solid var(--line);font-size:14px;color:var(--ink-2)}
@media (max-width:900px){.demo{grid-template-columns:1fr}.demo-panel{position:static}}
@media (max-width:480px){.demo-text{padding:20px}.demo-text p.para{font-size:16px}}

/* teacher */
.teacher-sec{color:#fff;background:radial-gradient(800px 500px at 90% 0%,#1F5FD6 0%,transparent 60%),linear-gradient(160deg,#041845 0%,#082D7A 60%,#05205C 100%);overflow:hidden}
.teacher-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:56px;align-items:center}
.teacher-img{position:relative;border-radius:28px;overflow:hidden;aspect-ratio:4/5;max-width:440px;box-shadow:var(--shadow-lg)}
.teacher-img img{width:100%;height:100%;object-fit:cover}
.teacher-img .badge{position:absolute;left:16px;bottom:16px;right:16px;padding:14px 16px;border-radius:16px;background:rgba(4,24,69,.72);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.14)}
.teacher-img .badge b{display:block;font-size:17px}
.teacher-img .badge span{font-size:13px;color:#A9C2EC}
.teacher-copy .kicker{color:#7DB8FF}
.teacher-copy h2{font-size:clamp(28px,3.4vw,42px);line-height:1.12;letter-spacing:-.02em;margin:10px 0 18px}
.teacher-copy p{color:#C8D8F5;font-size:17px}
.teacher-copy blockquote{margin:28px 0;padding:22px 26px;border-left:4px solid #5AA2FF;background:rgba(255,255,255,.06);border-radius:0 18px 18px 0;font-size:clamp(20px,2.2vw,26px);font-style:italic;font-weight:500;line-height:1.4}
.teacher-copy blockquote cite{display:block;font-family:Caveat,cursive;font-style:normal;font-size:26px;color:#9EC2FF;margin-top:8px}
.teacher-points{list-style:none;display:grid;gap:12px}
.teacher-points li{display:flex;gap:12px;align-items:flex-start;color:#E4EDFF}
.teacher-points svg{color:#5FE08A;margin-top:3px}
.teacher-stats{display:grid;grid-template-columns:auto 1fr;gap:12px;margin:22px 0}
.teacher-stats div{padding:16px 18px;border-radius:16px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12)}
.teacher-stats strong{display:block;font-size:clamp(24px,2.6vw,32px);line-height:1.1;color:#fff}
.teacher-stats span{display:block;font-size:14px;color:#A9C2EC;margin-top:4px}
.teacher-bio{margin:0 0 22px}
.teacher-bio svg{color:#7DB8FF}
@media (max-width:520px){.teacher-stats{grid-template-columns:1fr}}
@media (max-width:900px){.teacher-grid{grid-template-columns:1fr}.teacher-img{margin:0 auto;width:100%}}

/* pricing */
.billing{display:inline-grid;grid-template-columns:1fr 1fr;background:#E8EEF8;border-radius:14px;padding:5px;margin:0 auto 36px}
.billing-wrap{text-align:center}
.billing button{padding:10px 22px;border-radius:10px;font-size:15px;font-weight:600;color:var(--ink-2)}
.billing button[aria-pressed="true"]{background:#fff;color:var(--ink);box-shadow:0 1px 4px rgba(0,0,0,.08)}
.billing em{font-style:normal;color:var(--green);font-size:12.5px;font-weight:700;margin-left:4px}
.plans{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;align-items:stretch}
.plan{position:relative;display:flex;flex-direction:column;padding:28px 24px;border-radius:22px;background:#fff;border:1px solid var(--line)}
.plan.hl{border:2px solid var(--blue);box-shadow:0 20px 50px rgba(23,102,232,.18);transform:translateY(-8px)}
.plan .badge{position:absolute;top:-13px;left:50%;transform:translateX(-50%);background:var(--orange);color:#1C1200;font-size:12px;font-weight:800;padding:5px 12px;border-radius:999px;white-space:nowrap}
.plan h3{font-size:19px}
.plan .for{font-size:14px;color:var(--ink-3);margin-top:2px;min-height:44px}
.price{margin:16px 0 4px;display:flex;align-items:baseline;gap:6px;flex-wrap:wrap}
.price strong{font-size:40px;font-weight:800;letter-spacing:-.03em;line-height:1}
.price span{font-size:15px;color:var(--ink-3);font-weight:600}
.price-note{font-size:13px;color:var(--green);font-weight:600;min-height:20px}
.plan ul{list-style:none;display:grid;gap:10px;margin:20px 0 26px;flex:1}
.plan li{display:flex;gap:10px;font-size:14.5px;color:var(--ink-2)}
.plan li svg{width:18px;height:18px;color:var(--green-b);stroke-width:2.6;margin-top:2px}
.plan li.no{color:var(--ink-3)}
.plan li.no svg{color:#B6C0D4}
.pricing-fine{text-align:center;font-size:13.5px;color:var(--ink-3);margin-top:28px;max-width:760px;margin-left:auto;margin-right:auto}
@media (max-width:1060px){.plans{grid-template-columns:1fr 1fr}.plan.hl{transform:none}}
@media (max-width:620px){.plans{grid-template-columns:1fr}}

/* b2b */
.b2b{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start}
.b2b-copy h2{font-size:clamp(28px,3.4vw,40px);line-height:1.12;letter-spacing:-.02em;margin:10px 0 16px}
.b2b-copy p{color:var(--ink-2);font-size:17px}
.b2b-list{list-style:none;display:grid;gap:14px;margin-top:24px}
.b2b-list li{display:flex;gap:14px;align-items:flex-start}
.b2b-list .ic{width:42px;height:42px;border-radius:12px;background:var(--blue-50);color:var(--blue);display:grid;place-items:center;flex:none}
.b2b-list b{display:block}
.b2b-list span{color:var(--ink-2);font-size:15px}
.form{padding:30px;border-radius:24px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow)}
.form h3{font-size:21px;margin-bottom:4px}
.form > p{color:var(--ink-3);font-size:14.5px;margin-bottom:20px}
.field{margin-bottom:16px}
.field label{display:block;font-size:14px;font-weight:600;margin-bottom:6px}
.field input,.field textarea,.field select{width:100%;height:48px;padding:0 14px;border-radius:12px;border:1.5px solid var(--line);background:#FAFCFF;font-size:15.5px;transition:border-color .2s,box-shadow .2s}
.field textarea{height:110px;padding:12px 14px;resize:vertical}
.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 4px rgba(23,102,232,.15);background:#fff}
.field .err{display:none;color:var(--red);font-size:13px;margin-top:5px}
.field.invalid input,.field.invalid textarea,.field.invalid select{border-color:var(--red)}
.field.invalid .err{display:block}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.form-status{margin-top:14px;font-size:14.5px;padding:12px 14px;border-radius:12px;display:none}
.form-status.ok{display:block;background:var(--green-50);color:var(--green)}
.form-note{font-size:12.5px;color:var(--ink-3);margin-top:12px}
@media (max-width:900px){.b2b{grid-template-columns:1fr}}
@media (max-width:480px){.row2{grid-template-columns:1fr}.form{padding:22px}}

/* faq */
.faq{max-width:820px;margin:0 auto;display:grid;gap:12px}
.faq details{border-radius:16px;background:#fff;border:1px solid var(--line);transition:border-color .2s,box-shadow .2s}
.faq details[open]{border-color:var(--blue-100);box-shadow:var(--shadow)}
.faq summary{list-style:none;cursor:pointer;padding:20px 22px;font-weight:700;font-size:16.5px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary svg{transition:transform .25s;color:var(--blue)}
.faq details[open] summary svg{transform:rotate(45deg)}
.faq .ans{padding:0 22px 20px;color:var(--ink-2);font-size:15.5px}

/* cta */
.cta{padding:clamp(56px,7vw,88px) 0}
.cta-box{position:relative;overflow:hidden;border-radius:32px;padding:clamp(36px,6vw,64px);color:#fff;text-align:center;background:radial-gradient(600px 300px at 80% 0%,#2F7BFF 0%,transparent 60%),linear-gradient(150deg,#0B3A8F,#041845)}
.cta-box h2{font-size:clamp(28px,3.8vw,46px);line-height:1.1;letter-spacing:-.025em;max-width:760px;margin:0 auto 14px}
.cta-box p{color:#C8D8F5;font-size:18px;max-width:600px;margin:0 auto}
.cta-box .hero-actions{justify-content:center}
.cta-box em{display:block;font-family:Caveat,cursive;font-style:normal;font-size:28px;color:#9EC2FF;margin-top:28px}

/* footer */
.site-footer{background:var(--navy-3);color:#A9C2EC;padding:56px 0 28px;font-size:14.5px}
.foot-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:32px}
.foot-grid h4{color:#fff;font-size:15px;margin-bottom:12px}
.foot-grid ul{list-style:none;display:grid;gap:8px}
.foot-grid a{color:#C8D8F5}
.foot-grid a:hover{color:#fff}
.foot-brand p{margin-top:14px;max-width:320px}
.foot-bottom{display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;margin-top:40px;padding-top:22px;border-top:1px solid rgba(255,255,255,.1);font-size:13.5px}
@media (max-width:860px){.foot-grid{grid-template-columns:1fr 1fr}}
@media (max-width:480px){.foot-grid{grid-template-columns:1fr}}

/* legal pages */
.legal-back{margin-left:auto;flex:none}
.legal-back:hover{text-decoration:none}
@media (max-width:520px){.legal-header .brand > span{display:none}}
.page-hero{color:#fff;padding:calc(var(--hdr) + 56px) 0 56px;background:linear-gradient(160deg,#041845 0%,#082D7A 60%,#05205C 100%)}
.page-hero h1{font-size:clamp(30px,4vw,46px);letter-spacing:-.025em;line-height:1.1}
.page-hero p{color:#C8D8F5;margin-top:10px}
.prose{max-width:800px;margin:0 auto;padding:56px var(--gutter) 88px}
.prose h2{font-size:23px;margin:38px 0 12px;letter-spacing:-.01em}
.prose h3{font-size:18px;margin:24px 0 8px}
.prose p,.prose li{color:var(--ink-2);font-size:16.5px}
.prose p{margin-bottom:12px}
.prose ul,.prose ol{padding-left:22px;margin-bottom:14px;display:grid;gap:6px}
.prose .note{padding:16px 18px;border-radius:14px;background:var(--blue-50);border:1px solid var(--blue-100);color:var(--navy-2);margin:20px 0}
.prose .steps-list{counter-reset:s;list-style:none;padding:0}
.prose .steps-list li{counter-increment:s;position:relative;padding:14px 16px 14px 58px;border-radius:14px;background:var(--bg);border:1px solid var(--line)}
.prose .steps-list li::before{content:counter(s);position:absolute;left:16px;top:13px;width:28px;height:28px;border-radius:50%;background:var(--blue);color:#fff;font-weight:700;display:grid;place-items:center;font-size:14px}
.prose table{width:100%;border-collapse:collapse;margin:12px 0 18px;font-size:15px}
.prose th,.prose td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top}
.prose th{background:var(--bg);font-weight:700}
.table-wrap{overflow-x:auto}

/* 404 */
.nf{min-height:100vh;display:grid;place-items:center;text-align:center;color:#fff;padding:var(--gutter);background:linear-gradient(160deg,#041845 0%,#082D7A 60%,#05205C 100%)}
.nf b{font-size:clamp(80px,16vw,160px);line-height:1;letter-spacing:-.05em;background:linear-gradient(90deg,#7DB8FF,#fff);-webkit-background-clip:text;background-clip:text;color:transparent}
.nf p{color:#C8D8F5;margin:12px 0 26px;font-size:18px}

/* reveal */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s ease,transform .7s cubic-bezier(.2,.8,.2,1)}
.reveal.in-view{opacity:1;transform:none}
.no-js .reveal{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  .reveal{opacity:1;transform:none}
}
@media (max-width:400px){.phone{--pw:270px}.showcase .phone{--pw:260px}}
.try-web{height:56px;font-size:17px;padding:0 26px}