/* Bigsun CSR pages (index, support-childrens-education, ai-for-beginners). Loaded AFTER udaan.css; touches nothing on the older pages. */
:root{--sky:oklch(0.95 0.035 235);--leaf:oklch(0.5 0.13 160);--leaf-soft:oklch(0.95 0.045 160)}
.csrhero{background:linear-gradient(180deg,var(--warm-soft),#fff 92%);padding:56px 0 40px;border-bottom:1px solid var(--line)}
.csrhero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center}
.csrhero h1{font:700 clamp(32px,5vw,52px)/1.1 var(--head);margin:8px 0 16px}
.csrhero .lede{font-size:20px;max-width:34em;color:var(--mut)}
.csrhero .art{max-width:420px;justify-self:center;width:100%}
.crumb{font-size:15px;color:var(--mut);margin:0 0 6px}
.crumb a{color:var(--accent)}
.tag{display:inline-block;font:700 13px var(--body);background:var(--accent-soft);color:var(--accent-dark);border-radius:999px;padding:3px 12px}
.sec{padding:52px 0}.sec.tint{background:var(--sky)}.sec.warm{background:var(--warm-soft)}
.sec h2{font:700 clamp(24px,3.4vw,34px)/1.2 var(--head);margin:0 0 10px}
.sec .lede{color:var(--mut);max-width:42em}
.two{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.three{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.pt{display:flex;gap:14px;align-items:flex-start}.pt svg{flex:none;width:34px;height:34px;stroke:var(--accent);fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.pt h3{margin:0 0 4px;font-size:19px}.pt p{margin:0;color:var(--mut)}
/* flow */
.flow{list-style:none;margin:26px 0 8px;padding:0;display:grid;grid-template-columns:repeat(7,1fr);gap:0;counter-reset:f}
.flow li{position:relative;text-align:center;padding:0 8px}
.flow .ic{width:64px;height:64px;border-radius:50%;background:#fff;border:2px solid var(--accent);display:grid;place-items:center;margin:0 auto 10px;position:relative;z-index:1}
.flow .ic svg{width:30px;height:30px;stroke:var(--accent);fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.flow li:not(:last-child)::after{content:"";position:absolute;top:31px;left:calc(50% + 34px);right:calc(-50% + 34px);border-top:3px dotted var(--line-2)}
.flow h3{font:700 15px/1.25 var(--head);margin:0 0 4px}.flow p{font-size:14px;color:var(--mut);margin:0}
.flow .n{position:absolute;top:-8px;left:calc(50% + 14px);z-index:2;background:var(--warm-strong);color:#fff;font:700 12px var(--body);width:22px;height:22px;border-radius:50%;display:grid;place-items:center}
.flow li.verify .ic{border-color:var(--leaf)}.flow li.verify .ic svg{stroke:var(--leaf)}
@media (max-width:900px){
 .flow{grid-template-columns:1fr;gap:0;margin-left:4px}
 .flow li{display:grid;grid-template-columns:64px 1fr;gap:14px;text-align:left;padding:0 0 22px;align-items:start}
 .flow .ic{margin:0}.flow .n{left:44px}
 .flow li:not(:last-child)::after{top:64px;bottom:0;left:31px;right:auto;border-top:0;border-left:3px dotted var(--line-2)}
 .two,.three,.csrhero-grid{grid-template-columns:1fr}
}
/* tiers table */
.tierwrap{overflow-x:auto;margin:18px 0}
table.tiers{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden;min-width:560px}
table.tiers th,table.tiers td{padding:14px 16px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
table.tiers thead th{background:var(--accent-soft);color:var(--accent-dark);font-size:15px}
table.tiers td.tbc{color:var(--mut);font-style:italic}
.notice{border-left:5px solid var(--warm-strong);background:var(--warm-soft);padding:14px 18px;border-radius:0 12px 12px 0;margin:18px 0}
.notice.ok{border-color:var(--leaf);background:var(--leaf-soft)}
.notice p{margin:0}.notice p+p{margin-top:8px}
/* payment */
.pay{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:18px}
.paybox{background:#fff;border:2px solid var(--line);border-radius:18px;padding:22px}
.paybox h3{margin:0 0 10px;display:flex;gap:10px;align-items:center}
.qrslot{aspect-ratio:1;max-width:240px;border:2px dashed var(--line-2);border-radius:14px;display:grid;place-items:center;text-align:center;padding:16px;color:var(--mut);margin:10px 0;background:var(--bg)}
.qrslot img{width:100%;height:auto;border-radius:8px}
dl.bank{margin:0;display:grid;grid-template-columns:auto 1fr auto;gap:8px 12px;align-items:center}
dl.bank dt{color:var(--mut);font-size:15px}dl.bank dd{margin:0;font-weight:700;word-break:break-all}
dl.bank .tbc{font-weight:400;font-style:italic;color:var(--mut)}
.copy{font:700 13px var(--body);border:1px solid var(--line-2);background:#fff;border-radius:8px;padding:3px 10px;cursor:pointer}
.copy:hover{border-color:var(--accent);color:var(--accent)}
.copy[hidden]{display:none}
@media (max-width:700px){.pay{grid-template-columns:1fr}dl.bank{grid-template-columns:1fr auto}dl.bank dt{grid-column:1/-1;margin-top:6px}}
/* confirm form */
.cform{background:#fff;border:2px solid var(--line);border-radius:18px;padding:24px;max-width:760px}
.cform .row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.cform label{display:block;font-weight:600;margin:14px 0 4px}
.cform input[type=text],.cform input[type=tel],.cform input[type=email],.cform input[type=date],.cform input[type=number],.cform select{width:100%}
.cform .check{display:flex;gap:10px;align-items:flex-start;font-weight:400;margin-top:16px}
.cform .check input{margin-top:5px;width:20px;height:20px;flex:none}
.cform .req{color:var(--err)}
@media (max-width:640px){.cform .row{grid-template-columns:1fr}}
.warnbox{background:oklch(0.96 0.03 25);border:2px solid oklch(0.7 0.14 25);border-radius:12px;padding:12px 16px;color:oklch(0.35 0.12 25);margin:14px 0}
/* big action */
.bigbtn{display:inline-flex;gap:10px;align-items:center}
.stickyhelp{position:sticky;top:0;z-index:5}
/* learning cards */
.lcards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:20px}
.lcard{display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);border-top:5px solid var(--accent);border-radius:14px;padding:22px;color:var(--ink)}
.lcard:hover{text-decoration:none;box-shadow:0 14px 32px rgba(40,30,110,.14);color:var(--ink)}
.lcard.w{border-top-color:var(--warm-strong)}.lcard.a{border-top-color:var(--leaf)}
.lcard h3{margin:6px 0}.lcard p{color:var(--mut);flex:1;margin:0 0 12px}.lcard .go{font-weight:700;color:var(--accent)}
@media (max-width:900px){.lcards{grid-template-columns:1fr}}
/* AI course */
.cbar{background:#fff;border:1px solid var(--line);border-radius:16px;padding:16px 20px;margin:18px 0}
.cbar .meter{height:12px;background:var(--line);border-radius:99px;overflow:hidden;margin:8px 0}
.cbar .meter span{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--leaf),var(--accent));transition:width .4s}
.road{list-style:none;display:grid;grid-template-columns:repeat(7,1fr);gap:8px;padding:0;margin:14px 0 0}
.road a{display:block;text-align:center;border:2px solid var(--line-2);background:#fff;border-radius:14px;padding:10px 4px;color:var(--ink);font-size:14px;font-weight:600;line-height:1.25}
.road a b{display:block;font:700 20px var(--head)}
.road a:hover{text-decoration:none;border-color:var(--accent)}
.road .done a{background:var(--leaf-soft);border-color:var(--leaf)}
.road .now a{border-color:var(--warm-strong);background:var(--warm-soft)}
.road .lock a{opacity:.55;pointer-events:none}
.road .st{display:block;font-size:12px;font-weight:700;color:var(--mut)}
@media (max-width:720px){.road{grid-template-columns:repeat(7,minmax(46px,1fr));gap:4px}.road a{font-size:0;padding:8px 2px}.road a b{font-size:18px}.road .st{display:none}}
.day{display:none}.day.on{display:block}
.nojs .day{display:block}
.day h2{font:700 clamp(24px,3.6vw,34px)/1.2 var(--head);margin:0 0 4px}
.obj{background:var(--sky);border-radius:14px;padding:14px 18px;margin:14px 0}.obj ul{margin:6px 0 0;padding-left:20px}
.words{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:10px;margin:10px 0}
.words div{background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 14px}.words b{color:var(--accent-dark)}
.eg{border-left:5px solid var(--leaf);background:var(--leaf-soft);padding:12px 16px;border-radius:0 12px 12px 0;margin:14px 0}
.act,.quiz{background:#fff;border:2px solid var(--line);border-radius:18px;padding:20px;margin:22px 0}
.act h3,.quiz h3{margin-top:0}
.opt{display:flex;gap:10px;align-items:flex-start;padding:10px 12px;border:2px solid var(--line-2);border-radius:12px;margin:8px 0;background:#fff;cursor:pointer;font-weight:400}
.opt input{margin-top:5px;width:20px;height:20px;flex:none}
.opt.right{border-color:var(--leaf);background:var(--leaf-soft)}.opt.wrong{border-color:var(--err);background:oklch(0.96 0.03 25)}
.q{margin:18px 0;border:0;padding:0}.q legend{font-weight:700;margin-bottom:6px}
.expl{display:none;margin:6px 0 0;padding:8px 12px;border-radius:10px;background:var(--bg);color:var(--mut)}.expl.show{display:block}
.srow{display:grid;grid-template-columns:1fr 200px;gap:10px;align-items:center;padding:8px 0;border-bottom:1px solid var(--line)}
.srow select{width:100%}.srow.right{background:var(--leaf-soft)}.srow.wrong{background:oklch(0.96 0.03 25)}
@media (max-width:560px){.srow{grid-template-columns:1fr}}
.fb{margin-top:10px;font-weight:600}.fb.ok{color:var(--ok)}.fb.no{color:var(--err)}
.daynav{display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;margin-top:26px}
.pb label{margin-top:12px;display:block;font-weight:600}.pb select{width:100%}
.promptout{white-space:pre-wrap;background:var(--bg);border:2px dashed var(--line-2);border-radius:12px;padding:14px;margin-top:12px;font-family:var(--body)}
.final{background:linear-gradient(135deg,var(--leaf-soft),var(--sky));border-radius:20px;padding:24px}
.hr{height:1px;background:var(--line);margin:24px 0;border:0}
ol.steps{list-style:none;margin:18px 0;padding:0;counter-reset:s}
ol.steps li{counter-increment:s;position:relative;background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px 16px 14px 62px;margin:10px 0}
ol.steps li::before{content:counter(s);position:absolute;left:16px;top:14px;width:32px;height:32px;border-radius:50%;background:var(--accent);color:#fff;font:700 16px var(--head);display:grid;place-items:center}
ol.steps li.verify::before{background:var(--leaf)}
ol.steps li strong{display:block}
ol.steps li span{color:var(--mut)}
.hp{position:absolute;left:-9999px;height:0;overflow:hidden}
.btnrow{display:flex;flex-wrap:wrap;gap:12px;margin-top:18px}
.faqs details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px 16px;margin:10px 0}
.faqs summary{font-weight:700;cursor:pointer}
.faqs details p{margin:8px 0 0;color:var(--mut)}
.csrbar{background:var(--accent-soft);border-bottom:1px solid var(--line)}
.csrbar ul{list-style:none;display:flex;flex-wrap:wrap;gap:4px 18px;margin:0;padding:8px 0}
.csrbar a{font-weight:600;font-size:15px;color:var(--accent-dark)}
.csrbar a[aria-current=page]{text-decoration:underline;text-underline-offset:5px}
.sitelinks{display:flex;flex-wrap:wrap;gap:10px 22px;margin:18px 0 0}
.moreband{background:var(--sky);border-radius:18px;padding:22px;margin:30px 0}
.moreband h2{margin:0 0 8px;font:700 24px var(--head)}
.paybox h3 svg{flex:none;width:30px;height:30px;stroke:var(--accent);fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
/* v2 visual lessons */
.big{font:700 clamp(20px,2.6vw,26px)/1.3 var(--head);margin:10px 0 14px;color:var(--accent-dark)}
.pts{margin:0 0 10px;padding-left:20px;font-size:18px}.pts li{margin:6px 0}
.note{background:var(--warm-soft);border-radius:12px;padding:10px 14px;margin:12px 0}
ol.chain{list-style:none;display:flex;flex-wrap:wrap;gap:8px 28px;padding:0;margin:12px 0}
ol.chain li{position:relative;background:#fff;border:2px solid var(--accent);border-radius:14px;padding:10px 16px;text-align:center;min-width:110px}
ol.chain li span{display:block;font-size:14px;color:var(--mut)}
ol.chain li:not(:last-child)::after{content:"→";position:absolute;right:-24px;top:50%;transform:translateY(-50%);font-weight:700;color:var(--accent)}
@media (max-width:560px){ol.chain{flex-direction:column;gap:22px}ol.chain li:not(:last-child)::after{content:"↓";right:auto;left:50%;top:auto;bottom:-24px;transform:translateX(-50%)}}
.cols2{display:grid;grid-template-columns:1fr 1fr;gap:14px}.cols2>div{border-radius:14px;padding:14px 16px}.cols2 .yes{background:var(--leaf-soft);border:2px solid var(--leaf)}.cols2 .no{background:oklch(0.96 0.03 25);border:2px solid oklch(0.7 0.14 25)}
@media (max-width:560px){.cols2{grid-template-columns:1fr}}
ul.chips{list-style:none;display:flex;flex-wrap:wrap;gap:8px;padding:0;margin:8px 0}ul.chips li{background:oklch(0.96 0.03 25);border:2px solid oklch(0.7 0.14 25);border-radius:999px;padding:4px 14px;font-weight:700;color:oklch(0.4 0.14 25)}
.day .badge{display:inline-grid;place-items:center;width:52px;height:52px;border-radius:50%;background:var(--accent);color:#fff;font:700 24px var(--head);margin-right:12px;vertical-align:middle}
.flowcap{max-width:44em;color:var(--mut)}
.day h2:focus{outline:none}
.sec h1{font:700 clamp(26px,4vw,38px)/1.2 var(--head);margin:6px 0 10px}
.lcard.done{border-top-color:var(--leaf);background:var(--leaf-soft)}.lcard.lock{opacity:.55}
a[aria-disabled=true]{opacity:.45;pointer-events:none}
.cards7 .lcard h3{font-size:19px}
.road li[aria-current=step] a{box-shadow:0 0 0 3px var(--accent)}
.road .lock a{pointer-events:none}