:root{--navy:#102f4a;--blue:#087fb8;--sky:#82d7f5;--pale:#e8f5fa;--ink:#193149;--muted:#647b8c;--line:#d7e4eb;--green:#267153;--surface:#fff;--bg:#f4f8fa}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.5 Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
a{color:inherit}
.site-header{height:72px;display:flex;align-items:center;gap:28px;padding:0 max(22px,5vw);background:#fff;border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:11px;text-decoration:none;white-space:nowrap}
.brand>span{width:40px;height:40px;border-radius:12px;display:grid;place-items:center;background:var(--navy);color:#fff;font-weight:900}
.brand strong,.brand small{display:block}.brand small{color:#6b8090;font-size:10px;letter-spacing:.1em}
.site-header nav{display:flex;gap:22px;margin-left:auto}.site-header nav a{text-decoration:none;color:#4e687a;font-size:14px}.account{border-radius:10px;padding:10px 13px;background:var(--navy);color:#fff;font-weight:800;text-decoration:none}
.page-hero{padding:52px max(24px,6vw);background:linear-gradient(120deg,#102e49 0%,#174e70 58%,#087bab 100%);color:#fff}
.page-hero small{color:#8cddfa;letter-spacing:.13em;font-size:12px;font-weight:850}.page-hero h1{font:400 clamp(36px,5vw,58px)/1.04 Georgia,serif;margin:7px 0 13px}.page-hero p{max-width:690px;color:#d8e9f1;font-size:17px;margin:0}
.resource-chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px}.resource-chips span{display:inline-flex;align-items:center;gap:6px;border:1px solid rgba(255,255,255,.25);border-radius:999px;background:rgba(255,255,255,.1);color:#e9f7fc;padding:7px 10px;font-size:12px;font-weight:800}.resource-chips b{color:#8cddfa}.resource-chips .open-access{background:#fff;color:#174760;border-color:#fff}.resource-chips .open-access b{color:#087fb8}
.wrap{width:min(1160px,92vw);margin:32px auto 54px}.toolbar{display:grid;grid-template-columns:minmax(220px,1fr) minmax(190px,.55fr);gap:14px;align-items:center;margin-bottom:22px}.search,.subject-select{width:100%;border:1px solid var(--line);background:#fff;border-radius:12px;padding:13px 15px;font:inherit;color:var(--ink)}.filters{display:flex;gap:7px;flex-wrap:wrap;grid-column:1/-1}.filters button{border:1px solid var(--line);background:#fff;color:#506b7d;border-radius:99px;padding:9px 12px;font-weight:750;cursor:pointer}.filters button.active{background:var(--navy);border-color:var(--navy);color:#fff}
.resource-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px}.resource-card{min-height:190px;background:#fff;border:1px solid var(--line);border-radius:18px;padding:20px;text-decoration:none;display:flex;flex-direction:column;transition:.18s transform,.18s box-shadow}.resource-card:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(25,61,86,.1)}.resource-type{width:max-content;border-radius:99px;padding:5px 9px;background:#e6f4f9;color:var(--blue);font-size:11px;font-weight:900;text-transform:uppercase;letter-spacing:.06em}.resource-card h2{font-size:19px;margin:20px 0 6px}.resource-card p{color:var(--muted);margin:0}.resource-card b{margin-top:auto;padding-top:18px;color:var(--blue)}
.empty{grid-column:1/-1;background:#fff;border:1px dashed #bfd2dc;border-radius:18px;padding:42px;text-align:center;color:var(--muted)}.empty strong{display:block;color:var(--ink);font:400 26px Georgia,serif;margin-bottom:7px}
.class-layout{display:grid;grid-template-columns:minmax(0,1.45fr) minmax(280px,.55fr);gap:20px;align-items:start}.player-card,.playlist{background:#fff;border:1px solid var(--line);border-radius:19px;overflow:hidden}.player-stage{aspect-ratio:16/9;background:#0c2233;display:grid;place-items:center;color:#c9dce6}.player-stage iframe,.player-stage video{width:100%;height:100%;border:0}.player-empty{text-align:center;padding:25px}.player-empty strong{display:block;color:#fff;font:400 25px Georgia,serif;margin-bottom:7px}.player-copy{padding:22px}.player-copy small{color:var(--blue);font-weight:850;letter-spacing:.08em}.player-copy h2{font:400 30px Georgia,serif;margin:6px 0 8px}.player-copy p{color:var(--muted);margin:0}.playlist{padding:12px}.playlist h2{font-size:17px;margin:5px 6px 12px}.class-choice{width:100%;border:0;border-top:1px solid var(--line);background:#fff;text-align:left;padding:14px 10px;cursor:pointer;display:grid;grid-template-columns:38px 1fr;gap:10px;color:var(--ink)}.class-choice:first-of-type{border-top:0}.class-choice>span{width:36px;height:36px;border-radius:10px;background:var(--pale);display:grid;place-items:center;color:var(--blue);font-weight:900}.class-choice strong,.class-choice small{display:block}.class-choice small{color:var(--muted);margin-top:2px}.class-choice.active{background:#eef8fc;border-radius:12px}.class-choice.active>span{background:var(--blue);color:#fff}
.playlist>.subject-select{margin:0 0 9px}
.back-row{margin-bottom:18px}.back-row a{color:var(--blue);font-weight:800;text-decoration:none}
.faq-page-list{width:min(850px,100%);margin:auto;display:grid;gap:10px}.faq-page-list details{background:#fff;border:1px solid var(--line);border-radius:14px;padding:0 18px}.faq-page-list summary{list-style:none;display:flex;justify-content:space-between;gap:20px;align-items:center;padding:17px 0;font-weight:850;cursor:pointer}.faq-page-list summary::-webkit-details-marker{display:none}.faq-page-list summary span{color:var(--blue);font-size:20px}.faq-page-list details[open] summary span{transform:rotate(45deg)}.faq-page-list details p{color:var(--muted);margin:0;padding:0 34px 18px 0}
.contact-page-layout{display:grid;grid-template-columns:.72fr 1.28fr;gap:24px;align-items:start}.contact-options,.contact-form-card{background:#fff;border:1px solid var(--line);border-radius:19px;padding:24px}.contact-options h2,.contact-form-card h2{font:400 30px Georgia,serif;margin:5px 0 9px}.contact-options>p,.contact-form-card>p{color:var(--muted)}.contact-option{display:grid;grid-template-columns:42px 1fr auto;gap:12px;align-items:center;border-top:1px solid var(--line);padding:17px 0;text-decoration:none}.contact-option:first-of-type{margin-top:16px}.contact-option>span{width:40px;height:40px;border-radius:11px;background:var(--pale);color:var(--blue);display:grid;place-items:center}.contact-option strong,.contact-option small{display:block}.contact-option small{color:var(--muted)}.contact-option b{color:var(--blue)}.contact-form{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:18px}.contact-form label{display:grid;gap:5px;font-size:13px;font-weight:800}.contact-form .wide{grid-column:1/-1}.contact-form input,.contact-form textarea{width:100%;border:1px solid var(--line);border-radius:10px;padding:11px 12px;font:inherit;color:var(--ink);background:#fff}.contact-form textarea{min-height:150px;resize:vertical}.contact-form button{width:max-content;border:0;border-radius:10px;background:var(--blue);color:#fff;padding:12px 16px;font-weight:850;cursor:pointer}.contact-form button:disabled{opacity:.6;cursor:wait}.contact-form-message{align-self:center;margin:0;color:var(--muted)}.contact-form-message.success{color:#167a55;font-weight:800}.contact-form-message.error{color:#a53535;font-weight:800}.contact-form-bottom{grid-column:1/-1;display:flex;align-items:center;gap:12px;flex-wrap:wrap}.contact-trap{position:absolute!important;left:-10000px!important;width:1px!important;height:1px!important;opacity:0!important}
footer{padding:26px max(24px,5vw);background:#102e49;color:#d8e8f0;display:grid;grid-template-columns:1fr auto;gap:22px}footer strong,footer small{display:block}footer small{color:#9eb7c5}footer a{text-decoration:none}
@media(max-width:850px){.site-header nav{display:none}.toolbar{grid-template-columns:1fr}.resource-grid{grid-template-columns:repeat(2,1fr)}.class-layout,.contact-page-layout{grid-template-columns:1fr}}
@media(max-width:560px){.site-header{padding:0 16px}.brand small{display:none}.account{margin-left:auto;padding:9px 10px}.page-hero{padding:38px 22px}.wrap{width:min(100% - 32px,1160px);margin-top:22px}.resource-grid{grid-template-columns:1fr}.filters{overflow-x:auto;flex-wrap:nowrap;padding-bottom:3px}.filters button{white-space:nowrap}.player-copy h2{font-size:25px}.contact-form{grid-template-columns:1fr}.contact-form .wide,.contact-form-bottom{grid-column:auto}.contact-options,.contact-form-card{padding:20px 17px}footer{grid-template-columns:1fr}}
.floating-whatsapp{position:fixed;z-index:80;right:22px;bottom:22px;display:flex;align-items:center;gap:8px;border-radius:999px;background:#20a866;color:#fff;padding:12px 16px;text-decoration:none;font-weight:850;box-shadow:0 10px 28px rgba(16,99,59,.3)}.floating-whatsapp span{width:25px;height:25px;border-radius:50%;display:grid;place-items:center;background:rgba(255,255,255,.2);font-size:10px}@media(max-width:560px){.floating-whatsapp{right:14px;bottom:14px;width:48px;height:48px;padding:0;justify-content:center}.floating-whatsapp strong{display:none}.floating-whatsapp span{background:transparent;font-size:14px}}