:root{--irina-primary:#6c63ff;--irina-primary-dark:#5148df;--irina-soft:#f5f6ff;--irina-text:#2b2d3a;--irina-muted:#8b91a3;--irina-card:#ffffff;--irina-border:#edf0f7;}
.irina-hero{background:linear-gradient(135deg,#6c63ff 0%,#8e63ff 45%,#ff5ab3 100%);border-radius:22px;padding:34px;color:#fff;box-shadow:0 22px 45px rgba(108,99,255,.22);position:relative;overflow:hidden;margin-bottom:26px}.irina-hero:after{content:"";position:absolute;right:-90px;top:-120px;width:300px;height:300px;border-radius:50%;background:rgba(255,255,255,.13)}.irina-hero h2{color:#fff;font-weight:800;margin:0;font-size:30px}.irina-hero p{margin:6px 0 0;color:rgba(255,255,255,.82)}
.irina-filter-bar{background:#fff;border-radius:16px;padding:14px 16px;display:flex;flex-wrap:wrap;gap:10px;box-shadow:0 10px 28px rgba(25,30,70,.05);margin-bottom:24px}.irina-filter-btn{border:1px solid #dfe3ff;background:#fff;color:var(--irina-primary);font-weight:800;font-size:12px;border-radius:999px;padding:10px 18px;transition:.2s ease;letter-spacing:.3px}.irina-filter-btn:hover,.irina-filter-btn.active{background:var(--irina-primary);color:#fff;box-shadow:0 8px 18px rgba(108,99,255,.25)}
.irina-topic-card{border:0;border-radius:22px;overflow:hidden;box-shadow:0 14px 38px rgba(28,34,90,.07);transition:.25s ease;background:#fff}.irina-topic-card:hover{transform:translateY(-4px);box-shadow:0 22px 52px rgba(28,34,90,.12)}.irina-topic-cover{height:220px;border-radius:18px;display:flex;align-items:center;justify-content:center;flex-direction:column;color:#fff;margin:20px 20px 0;background:linear-gradient(135deg,#6c63ff,#ff5ab3)}.irina-topic-icon{font-size:70px;line-height:1;margin-bottom:16px}.irina-topic-label{font-size:16px;font-weight:900;letter-spacing:.9px}.irina-math{background:linear-gradient(135deg,#635bff,#24c6dc)}.irina-english{background:linear-gradient(135deg,#00a7b5,#27d3a2)}.irina-reading{background:linear-gradient(135deg,#9b5de5,#f15bb5)}.irina-default{background:linear-gradient(135deg,#6c63ff,#8791ff)}.irina-topic-body{text-align:center;padding:22px 24px 28px}.irina-topic-body h4{font-weight:900;color:#282a35;font-size:18px;line-height:1.35;margin-bottom:14px;text-transform:uppercase}.irina-chip{display:inline-flex;align-items:center;border-radius:999px;background:#f2f3ff;color:#5b52e8;font-weight:800;font-size:12px;padding:7px 12px;margin:2px}.irina-topic-meta{font-size:16px;color:#8b91a3;line-height:1.8}.irina-topic-meta strong{color:#6f7483}.irina-topic-actions{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin-top:14px}.irina-topic-actions .btn{border-radius:9px;font-weight:800;padding:9px 16px}
.irina-section-card{border:0;border-radius:18px;box-shadow:0 12px 34px rgba(28,34,90,.06);overflow:hidden;margin-bottom:22px}.irina-section-card .card-header{background:#fff;border-bottom:1px solid var(--irina-border);padding:22px 26px}.irina-section-card .card-header h4{font-weight:900;color:#2b2d3a;margin:0}.irina-section-card .card-header span{color:var(--irina-muted);font-size:13px}.irina-section-card .card-body{padding:26px}.irina-section-title{display:flex;align-items:center;gap:10px}.irina-section-title .bubble{width:34px;height:34px;border-radius:12px;display:flex;align-items:center;justify-content:center;background:var(--irina-soft);color:var(--irina-primary);font-weight:900}.irina-form label{font-weight:800;color:#343745;font-size:13px;text-transform:uppercase;letter-spacing:.3px}.irina-form .form-control{border-radius:10px;border-color:#e7eaf3;min-height:46px}.irina-form textarea.form-control{min-height:110px}.irina-form .form-control:focus{border-color:var(--irina-primary);box-shadow:0 0 0 .15rem rgba(108,99,255,.12)}
.irina-detail-header{background:#fff;border-radius:24px;padding:30px;box-shadow:0 16px 40px rgba(28,34,90,.08);margin-bottom:24px}.irina-detail-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}@media(max-width:991px){.irina-detail-grid{grid-template-columns:1fr}}.irina-info-row{padding:13px 0;border-bottom:1px solid #f1f2f6}.irina-info-row strong{color:#343745}.irina-big-action{display:flex;gap:12px;flex-wrap:wrap;margin-top:18px}.irina-big-action .btn{border-radius:12px;font-weight:900;padding:12px 18px}.irina-student-block{background:#fff;border-radius:18px;padding:24px;box-shadow:0 12px 34px rgba(28,34,90,.06);height:100%}.irina-student-block h4{font-weight:900;margin-bottom:16px}.irina-empty{color:#a0a5b5;font-style:italic}.irina-video-box{background:#111827;border-radius:18px;color:#fff;min-height:220px;display:flex;align-items:center;justify-content:center;flex-direction:column;text-align:center;padding:30px}.irina-video-box a{color:#fff;font-weight:900}.irina-menu-drag-hint{font-size:11px;color:#9aa4b2;margin:4px 20px 10px}.irina-menu-dragging{opacity:.55}