:root{
  --yellow:#F6C945;--pink:#E86A92;--pink-light:#F9D7E2;--yellow-light:#FFF3C4;
  --white:#FFFFFF;--ink:#2B2B2B;--soft:#F3F3F3;--line:#E8E8E8;--muted:#707070;
  --radius:18px;--shadow:0 18px 60px rgba(43,43,43,.07)
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:#fff;line-height:1.55}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}.container{width:min(1120px,calc(100% - 40px));margin:auto}
.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.95);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}.nav-wrap{height:78px;display:flex;align-items:center;justify-content:space-between}.brand{display:flex;flex-direction:column;line-height:1.1}.brand-name{font-weight:800;font-size:20px}.brand-sub{font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-top:5px}.nav{display:flex;gap:28px;font-size:14px;font-weight:650}.nav a:hover{color:var(--pink)}.nav-toggle{display:none;border:0;background:transparent;font-size:24px}
.hero{padding:78px 0 64px;background:linear-gradient(180deg,#fff 0%,#fffdf7 100%)}.hero-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:70px;align-items:center}.eyebrow{display:inline-flex;background:var(--yellow-light);padding:7px 11px;border-radius:999px;font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase}.eyebrow.pink{background:var(--pink-light)}h1{font-size:clamp(42px,6vw,78px);letter-spacing:-.055em;line-height:.98;margin:20px 0 22px;max-width:850px}h2{font-size:clamp(28px,4vw,42px);letter-spacing:-.04em;margin:8px 0}.hero p,.page-head p{font-size:18px;color:var(--muted);max-width:690px}.search-bar{display:flex;max-width:720px;border:1px solid var(--line);border-radius:16px;padding:7px;background:#fff;box-shadow:var(--shadow);margin-top:30px}.search-bar input{flex:1;border:0;outline:0;padding:12px 15px;min-width:0}.search-bar button{border:0;background:var(--pink);color:#fff;padding:12px 22px;border-radius:11px;font-weight:800}.math-card{height:390px;border:1px solid var(--line);border-radius:30px;position:relative;overflow:hidden;background:#fff;box-shadow:var(--shadow)}.math-grid{position:absolute;inset:0;background-image:linear-gradient(#eee 1px,transparent 1px),linear-gradient(90deg,#eee 1px,transparent 1px);background-size:32px 32px;opacity:.7}.formula{position:absolute;font-family:Georgia,serif;font-style:italic;font-size:26px}.f1{top:55px;left:55px}.f2{right:44px;top:155px;color:var(--pink)}.f3{bottom:50px;left:70px}.circle{position:absolute;width:150px;height:150px;border:22px solid var(--yellow);border-radius:50%;right:-22px;bottom:-15px;opacity:.8}
.section{padding:72px 0}.section.soft{background:var(--soft)}.section-head{display:flex;justify-content:space-between;align-items:end;gap:20px;margin-bottom:28px}.section-head>a{font-weight:750;font-size:14px}.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.topic-card{min-height:235px;padding:24px;border:1px solid var(--line);border-radius:var(--radius);display:flex;flex-direction:column;position:relative;transition:.2s;background:#fff}.topic-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}.topic-card.yellow-accent{border-top:6px solid var(--yellow)}.topic-card.pink-accent{border-top:6px solid var(--pink)}.topic-card h3,.pda-card h3{font-size:22px;margin:18px 0 8px;letter-spacing:-.02em}.topic-card p,.pda-card p{color:var(--muted);font-size:14px;margin:0}.card-index{font-size:12px;font-weight:800;color:var(--muted)}.card-link,.meta{margin-top:auto;padding-top:18px;font-weight:800;font-size:13px}.pda-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.pda-card{background:#fff;border-radius:var(--radius);padding:24px;border:1px solid var(--line);min-height:200px}.pda-card>span{color:var(--pink);font-weight:850;font-size:12px;text-transform:uppercase;letter-spacing:.08em}.material-list{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}.material-row{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:19px 22px;border-bottom:1px solid var(--line);background:#fff}.material-row:last-child{border:0}.material-main{display:flex;align-items:center;gap:16px}.material-main h3{margin:0 0 3px;font-size:16px}.material-main p{margin:0;font-size:13px;color:var(--muted)}.type-pill{width:58px;text-align:center;font-size:9px;font-weight:900;letter-spacing:.05em;background:var(--yellow-light);padding:9px 5px;border-radius:9px}.material-actions{display:flex;gap:8px}.btn{display:inline-flex;justify-content:center;align-items:center;border:0;border-radius:11px;padding:11px 16px;font-weight:800;font-size:13px;cursor:pointer}.btn.primary,.btn.small{background:var(--pink);color:#fff}.btn.ghost{border:1px solid var(--line);background:#fff}.btn.full{width:100%;margin-top:10px}.page-head{padding:70px 0 45px;background:linear-gradient(180deg,var(--yellow-light),#fff)}.page-head.pink-bg{background:linear-gradient(180deg,var(--pink-light),#fff)}.page-head h1{font-size:clamp(44px,6vw,70px);margin-bottom:12px}.filters{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:24px}.filters select,.admin-form input,.admin-form select,.admin-form textarea,.login-card input{border:1px solid var(--line);border-radius:11px;padding:12px 13px;background:#fff;width:100%;outline:none}.filters select{width:auto}.standalone{margin-top:24px}.detail-grid{display:grid;grid-template-columns:1fr 320px;gap:28px}.viewer{min-height:500px;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:var(--soft)}.pdf-viewer{width:100%;height:700px;border:0}.video-wrap{aspect-ratio:16/9}.video-wrap iframe{width:100%;height:100%;border:0}.resource-placeholder{height:100%;min-height:500px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:40px}.resource-placeholder>span{font-size:78px;color:var(--pink)}.resource-placeholder p{color:var(--muted)}.detail-aside{border:1px solid var(--line);border-radius:var(--radius);padding:23px;height:max-content;position:sticky;top:100px}.detail-aside h3{margin-top:0}.detail-aside dl>div{padding:10px 0;border-bottom:1px solid var(--line)}dt{font-size:11px;text-transform:uppercase;letter-spacing:.07em;color:var(--muted);font-weight:800}dd{margin:3px 0 0;font-weight:700}.site-footer{border-top:1px solid var(--line);padding:40px 0;margin-top:30px}.footer-inner{display:flex;justify-content:space-between;gap:20px;color:var(--muted);font-size:13px}.footer-inner p{margin:4px 0}.empty{padding:28px;color:var(--muted);background:#fff;border-radius:var(--radius)}
.login-page{min-height:100vh;display:grid;place-items:center;background:linear-gradient(135deg,var(--yellow-light),#fff 50%,var(--pink-light));padding:30px}.login-card{width:min(430px,100%);background:#fff;border:1px solid var(--line);border-radius:24px;padding:34px;box-shadow:var(--shadow)}.login-card h1{font-size:38px;margin:16px 0 4px}.login-card p{color:var(--muted);margin-top:0}.login-card label,.admin-form label{display:flex;flex-direction:column;gap:7px;font-size:13px;font-weight:750;margin-bottom:16px}.back-link{display:block;text-align:center;margin-top:18px;font-size:13px}.alert{background:#ffe8e8;color:#8a2626;border-radius:10px;padding:12px;margin:14px 0;font-size:13px}.alert.success{background:#e7f8ed;color:#25653a}
.admin-body{background:#f6f6f6}.admin-shell{display:grid;grid-template-columns:245px 1fr;min-height:100vh}.sidebar{position:sticky;top:0;height:100vh;background:#2B2B2B;color:#fff;padding:25px 18px;display:flex;flex-direction:column}.admin-brand{padding:8px 10px 25px;display:flex;flex-direction:column}.admin-brand span{font-size:11px;color:#aaa;text-transform:uppercase;letter-spacing:.08em;margin-top:4px}.sidebar nav{display:flex;flex-direction:column;gap:4px}.sidebar nav a,.sidebar-bottom>a:not(.btn){padding:10px;border-radius:9px;font-size:14px;color:#ddd}.sidebar nav a:hover{background:#3a3a3a;color:#fff}.sidebar-bottom{margin-top:auto;display:flex;flex-direction:column;gap:6px}.admin-main{padding:0 30px 50px;min-width:0}.admin-top{height:100px;display:flex;align-items:center;justify-content:space-between}.admin-top h1{font-size:30px;margin:0;letter-spacing:-.03em}.admin-top small{color:var(--muted)}.admin-user{background:var(--pink-light);padding:9px 12px;border-radius:999px;font-weight:750;font-size:12px}.admin-menu{display:none}.stats{display:grid;grid-template-columns:repeat(5,1fr);gap:12px;margin-bottom:20px}.stats>div{background:#fff;border:1px solid var(--line);border-radius:15px;padding:18px}.stats span{display:block;font-size:12px;color:var(--muted)}.stats strong{font-size:30px}.admin-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px;margin-bottom:20px}.admin-card h2{font-size:22px;margin-top:0}.admin-table{border-top:1px solid var(--line)}.admin-row{display:grid;grid-template-columns:minmax(220px,1fr) auto auto;gap:16px;align-items:center;border-bottom:1px solid var(--line);padding:14px 4px;font-size:13px}.admin-row small{display:block;color:var(--muted);margin-top:3px}.status{font-size:11px;padding:6px 9px;border-radius:999px;font-weight:800}.status.published{background:#e8f7ee;color:#26643b}.status.hidden{background:#eee;color:#666}.admin-grid{display:grid;grid-template-columns:370px 1fr;gap:20px}.admin-form textarea{resize:vertical;min-height:95px}.admin-form .check,.checks .check{display:flex;flex-direction:row;align-items:center;gap:8px}.check input{width:auto}.inline{display:inline}.inline button,.link-btn,.link-danger{border:0;background:none;padding:0;cursor:pointer;font-weight:700;font-size:12px}.link-btn{color:#444}.link-danger{color:#b83232}.row-actions{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:0 16px}.two-col label{margin-bottom:14px}.span-2{grid-column:1/-1}.form-actions{display:flex;gap:10px}.form-card{max-width:900px}.checks{display:flex;gap:20px;align-items:center}
@media(max-width:900px){.hero-grid,.detail-grid,.admin-grid{grid-template-columns:1fr}.math-card{height:250px}.cards,.pda-grid{grid-template-columns:repeat(2,1fr)}.stats{grid-template-columns:repeat(2,1fr)}.detail-aside{position:static}.admin-shell{grid-template-columns:1fr}.sidebar{position:fixed;left:-260px;z-index:50;width:245px;transition:.2s}.sidebar.open{left:0}.admin-menu{display:block;border:0;background:#fff;border-radius:8px;padding:8px 10px}.admin-main{padding:0 16px 40px}.admin-top{gap:12px}.admin-top>div{margin-right:auto}}
@media(max-width:650px){.container{width:min(100% - 26px,1120px)}.nav-toggle{display:block}.nav{display:none;position:absolute;top:78px;left:13px;right:13px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;flex-direction:column;gap:14px;box-shadow:var(--shadow)}.nav.open{display:flex}.hero{padding-top:50px}.hero-grid{gap:35px}h1{font-size:48px}.cards,.pda-grid{grid-template-columns:1fr}.section{padding:50px 0}.section-head{align-items:flex-start}.material-row{align-items:flex-start;flex-direction:column}.material-actions{width:100%}.material-actions .btn{flex:1}.filters>*{width:100%!important}.footer-inner{flex-direction:column}.two-col{grid-template-columns:1fr}.span-2{grid-column:auto}.admin-row{grid-template-columns:1fr}.stats{grid-template-columns:1fr 1fr}}