:root{--bg:#f6f7fb;--card:#fff;--ink:#14162b;--mute:#6b7089;--brand:#4f46e5;--line:#e4e6f0;--ok:#0f9d6b}
*{box-sizing:border-box}body{margin:0;font:15px/1.5 system-ui,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--ink)}
header.top{background:var(--ink);color:#fff;padding:14px 20px;display:flex;align-items:center;gap:14px;flex-wrap:wrap}
header.top b{font-size:20px}header.top span{color:#a9adc7;font-size:13px}header.top .sp{flex:1}
header.top a{color:#fff;text-decoration:none;font-size:14px;margin-left:12px}
main{padding:0 16px 40px;max-width:1000px;margin:0 auto}
.box{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:22px;margin-top:20px}
.narrow{max-width:420px;margin:40px auto}
label{display:block;font-weight:600;font-size:13px;margin:12px 0 4px}
input,select{width:100%;padding:10px;border:1px solid var(--line);border-radius:8px;font:inherit;background:#fff}
.row{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px}
.go,.btn{display:inline-block;margin-top:16px;background:var(--brand);color:#fff;border:0;padding:11px 22px;border-radius:8px;font:inherit;font-weight:700;cursor:pointer;text-decoration:none}
.go.alt{background:#fff;color:var(--brand);border:1px solid var(--brand)}
.mini{background:var(--bg);border:1px solid var(--line);border-radius:6px;padding:3px 9px;font-size:12px;cursor:pointer}
table{width:100%;border-collapse:collapse;margin-top:14px}th,td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--line);font-size:14px}
th{color:var(--mute);font-size:12px;text-transform:uppercase}
.tag{display:inline-block;padding:2px 8px;border-radius:99px;font-size:12px;background:#eef;color:var(--brand)}
.bar{height:8px;background:var(--line);border-radius:9px;overflow:hidden;min-width:80px}.bar i{display:block;height:100%;background:var(--brand)}
.card{border:1px solid var(--line);border-radius:10px;padding:12px 14px;margin:10px 0;background:#fcfcff}
.card h4{margin:0 0 6px;font-size:13px;color:var(--mute);text-transform:uppercase;letter-spacing:.04em}
.line{display:flex;justify-content:space-between;gap:10px;align-items:flex-start;padding:5px 0;border-bottom:1px dashed var(--line);white-space:pre-line}.line:last-child{border:0}
.n{font-size:12px;white-space:nowrap}.n.ok{color:var(--ok)}.n.bad{color:#dc2626}
.note{background:#fff8e6;border:1px solid #f3dfa2;border-radius:8px;padding:10px 12px;font-size:13px;margin-top:14px}
.err{background:#fdecec;border:1px solid #f3b4b4;color:#8a1c1c;border-radius:8px;padding:10px 12px;margin:10px 0;font-size:14px}
.big{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:12px;margin-top:14px}.big div{background:var(--bg);border-radius:10px;padding:12px}.big b{font-size:22px;display:block}
.plans{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:14px;margin-top:16px}
.plan{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px}.plan.hot{border:2px solid var(--brand)}
.plan h3{margin:0}.plan .pr{font-size:28px;font-weight:800;margin:6px 0}.plan .pr small{font-size:13px;color:var(--mute);font-weight:400}
.plan ul{padding-left:18px;margin:8px 0;color:var(--mute);font-size:14px}
.hero{padding:44px 0 10px}.hero h1{font-size:34px;line-height:1.2;margin:0 0 10px}.hero p{color:var(--mute);font-size:17px;max-width:640px}
nav.tabs{display:flex;gap:6px;padding:12px 0 0;flex-wrap:wrap}
nav.tabs button{border:0;background:none;padding:10px 16px;border-radius:8px 8px 0 0;font:inherit;cursor:pointer;color:var(--mute);font-weight:600}
nav.tabs button.on{background:var(--card);color:var(--brand);box-shadow:0 -2px 0 var(--brand) inset}
.panel{display:none;background:var(--card);border-radius:0 12px 12px 12px;padding:22px;border:1px solid var(--line)}.panel.on{display:block}
a{color:var(--brand)}
nav.menu{background:#fff;border-bottom:1px solid var(--line);padding:0 16px;display:flex;flex-wrap:wrap;gap:2px;align-items:center}
nav.menu a{padding:11px 12px;font-size:14px;font-weight:600;color:var(--mute);text-decoration:none;border-bottom:3px solid transparent}
nav.menu a:hover{color:var(--ink)}nav.menu a.on{color:var(--brand);border-bottom-color:var(--brand)}
nav.menu .owner{margin-left:auto;font-size:12px;color:var(--mute);background:#f0f1f7;border:1px dashed #c9cce0;border-radius:8px;padding:3px 10px}
nav.menu .owner a{display:inline;padding:0 6px;font-size:12px;border:0;color:var(--brand)}
.tools{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:14px;margin-top:16px}
.tools a{display:block;background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px;text-decoration:none;color:var(--ink)}
.tools a:hover{border-color:var(--brand)}.tools b{display:block;font-size:16px;margin-bottom:4px}.tools span{color:var(--mute);font-size:13px}.tools i{display:block;font-style:normal;font-size:12px;color:var(--brand);margin-top:8px}

.def{border-bottom:1px dotted var(--brand);cursor:help;color:inherit}
.tier{display:inline-block;font-size:12px;font-weight:700;padding:2px 10px;border-radius:99px}
.tier.a{background:#dcfce7;color:#166534}.tier.b{background:#e0e7ff;color:#3730a3}.tier.c{background:#f3f4f6;color:#4b5563}
.kwcard{border:1px solid var(--line);border-radius:14px;padding:14px 16px;margin:10px 0;background:#fff}
.kwcard h4{margin:0 0 4px;font-size:17px;text-transform:none;letter-spacing:0;color:var(--ink)}
.copybox{background:var(--bg);border:1px dashed var(--line);border-radius:8px;padding:6px 10px;margin:4px 0;font-size:13px;display:flex;justify-content:space-between;gap:8px;align-items:flex-start}
.copybox span{flex:1;word-break:break-word}
.chk{display:flex;gap:10px;align-items:flex-start;padding:8px 0;border-bottom:1px dashed var(--line)}.chk input{width:auto;margin-top:4px}.chk .w{color:var(--mute);font-size:13px;display:block}
.prog{height:10px;background:var(--line);border-radius:9px;overflow:hidden}.prog i{display:block;height:100%;background:linear-gradient(90deg,#4f46e5,#ec4899);transition:width .3s}
.lesson{border:1px solid var(--line);border-radius:14px;background:#fff;margin:10px 0;overflow:hidden}.lesson summary{cursor:pointer;padding:14px 16px;font-weight:700;display:flex;gap:10px;align-items:center;list-style:none}.lesson summary::-webkit-details-marker{display:none}
.lesson .in{padding:0 18px 16px}.lesson .do{background:#fffbeb;border:1px solid #fde68a;border-radius:10px;padding:10px 14px;margin-top:10px}
.lesson.done summary{background:#ecfdf5}

header.top{background:#fff;color:var(--ink);border-bottom:1px solid var(--line);padding:8px 20px}
header.top a{color:var(--ink);font-weight:600}
header.top .brand{margin:0;display:flex;align-items:center}header.top .brand img{display:block;height:47px;width:auto}
header.top a.signup{background:var(--brand);color:#fff;padding:8px 16px;border-radius:9px}
@media(max-width:520px){header.top .brand img{height:38px}header.top a{margin-left:8px;font-size:13px}}

footer.foot{max-width:1000px;margin:40px auto 0;padding:22px 20px 34px;border-top:1px solid var(--line);color:var(--mute);font-size:12.5px;line-height:1.55;text-align:center}
footer.foot .fl{display:flex;flex-wrap:wrap;justify-content:center;gap:6px 18px;margin-bottom:10px}
footer.foot .fl a{color:var(--ink);font-weight:600;font-size:13.5px;text-decoration:none}footer.foot .fl a:hover{text-decoration:underline}
footer.foot p{margin:6px auto;max-width:760px}footer.foot .cp{font-size:12px}
label.agree{display:flex;gap:10px;align-items:flex-start;font-weight:400;font-size:14px;line-height:1.45;margin:12px 0}
label.agree input{width:auto;margin-top:3px;flex:0 0 auto}
.otp-input{font-size:28px;letter-spacing:.45em;text-align:center;font-weight:700}
.altlink{display:block;text-align:center;margin-top:10px;font-size:14px}
.legal h3{margin:20px 0 6px;font-size:17px}.legal p,.legal li{line-height:1.6}.legal ul{padding-left:20px}
header.top .hs{color:inherit}
header.top a[href="learn.php"]{text-transform:capitalize}
@media(max-width:520px){header.top{flex-wrap:nowrap;padding:8px 12px}header.top .hs{display:none}header.top a.signup{padding:7px 10px;white-space:nowrap}header.top a{margin-left:10px;font-size:13px;white-space:nowrap}header.top .brand img{height:32px}}
h1.pt{font-size:1.5em;margin:0 0 .6em;line-height:1.25}
footer.foot .fl a{padding:4px 2px}

/* in-depth learning modules */
main.mod .in h4{margin:22px 0 6px;font-size:17px;color:var(--ink)}
main.mod .in p,main.mod .in li{line-height:1.65}
main.mod .in ul,main.mod .in ol{padding-left:22px}
.goalb{background:#fffbeb;border:1px solid #fde68a;border-radius:10px;padding:10px 14px;margin-bottom:6px}
.exb{background:#f5f3ff;border:1px solid #ddd6fe;border-left:4px solid #6366f1;border-radius:10px;padding:10px 14px;margin:14px 0}
.exb .exl{display:block;font-size:12px;letter-spacing:.04em;text-transform:uppercase;color:#4f46e5;margin-bottom:5px}
.exb ul{margin:4px 0 0}.exb li{margin:3px 0}
.tipb{background:#ecfdf5;border:1px solid #a7f3d0;border-radius:10px;padding:10px 14px;margin:14px 0}
.mtablewrap{overflow-x:auto;margin:12px 0}
.mtable{width:100%;border-collapse:collapse;font-size:14px;min-width:420px}
.mtable th,.mtable td{border:1px solid var(--line);padding:8px 10px;text-align:left;vertical-align:top;line-height:1.45}
.mtable th{background:#f3f4fb}
pre.codeb{background:#0f1030;color:#e0e7ff;border-radius:10px;padding:12px 14px;overflow-x:auto;font-size:13px;white-space:pre-wrap;word-break:break-word;margin:12px 0}
.quizb details{border:1px solid var(--line);border-radius:10px;padding:8px 12px;margin:8px 0;background:#fff}
.quizb summary{cursor:pointer;font-weight:600}.quizb details p{margin:8px 0 2px;color:#065f46;background:#ecfdf5;border-radius:8px;padding:8px 10px}
ol.toc{padding-left:22px;line-height:1.9;margin:0}ol.toc a{font-weight:600}
.modcards{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:14px;margin:14px 0}
.modcards a.mc{display:block;background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px;text-decoration:none;color:var(--ink);box-shadow:0 2px 8px rgba(30,27,75,.06)}
.modcards a.mc:hover{border-color:#6366f1;box-shadow:0 6px 18px rgba(79,70,229,.18)}
.modcards .me{font-size:30px;display:block}.modcards b{display:block;font-size:19px;margin:4px 0}.modcards small{display:block;color:var(--mute);font-size:13.5px;line-height:1.45}.modcards em{display:block;margin-top:10px;font-style:normal;font-weight:700;font-size:13px;color:#4f46e5}