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h3{color:var(--text-primary);margin-bottom:1rem;font-size:1.5rem;font-weight:700}.description-content p{color:var(--text-secondary);font-size:1rem;line-height:1.8}.categories-section{background:var(--bg-secondary);padding:8rem 2rem}.categories-container{max-width:1400px;margin:0 auto}.categories-header{text-align:center;max-width:700px;margin:0 auto 5rem}.categories-grid{grid-template-columns:repeat(3,1fr);gap:2rem;margin-bottom:4rem;display:grid}.category-card{background:var(--bg-primary);border:1px solid var(--border);border-radius:24px;padding:3rem;text-decoration:none;transition:all .4s;position:relative;overflow:hidden}.category-card:before{content:"";background:var(--primary);transform-origin:0;height:4px;transition:transform 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.3s;display:inline-flex}.btn-primary-large:hover{background:var(--primary-dark);box-shadow:var(--shadow-xl);transform:translateY(-2px)}.lectures-page{min-height:100vh;padding-top:5rem}.lectures-hero{background:linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);color:#fff;padding:6rem 2rem}.lectures-hero-content{text-align:center;max-width:1400px;margin:0 auto}.lectures-title{letter-spacing:-.02em;margin-bottom:1rem;font-size:4rem;font-weight:800}.lectures-subtitle{opacity:.9;font-size:1.25rem}.lectures-container{max-width:1400px;margin:0 auto;padding:4rem 2rem}.filter-section{background:var(--bg-primary);border:1px solid var(--border);border-radius:16px;flex-wrap:wrap;align-items:center;gap:1.5rem;margin-bottom:3rem;padding:2rem;display:flex}.filter-label{color:var(--text-primary);font-size:.9375rem;font-weight:600}.filter-buttons{flex-wrap:wrap;flex:1;gap:1rem;display:flex}.filter-btn{border:2px solid var(--border);background:var(--bg-primary);color:var(--text-secondary);cursor:pointer;border-radius:100px;padding:.75rem 1.5rem;font-family:Pretendard,-apple-system,BlinkMacSystemFont,system-ui,sans-serif;font-size:.9375rem;font-weight:600;transition:all .3s}.filter-btn:hover{border-color:var(--primary);color:var(--primary);background:var(--bg-secondary)}.filter-btn.active{background:var(--primary);color:#fff;border-color:var(--primary)}.video-grid{grid-template-columns:repeat(3,1fr);gap:2.5rem;display:grid}.video-card{background:var(--bg-primary);border:1px solid var(--border);cursor:pointer;border-radius:20px;transition:all .3s;overflow:hidden}.video-card:hover{box-shadow:var(--shadow-xl);border-color:var(--primary);transform:translateY(-8px)}.video-thumbnail{background:linear-gradient(135deg, var(--primary), var(--primary-dark));width:100%;padding-top:56.25%;position:relative;overflow:hidden}.video-thumbnail img{object-fit:cover;width:100%;height:100%;transition:transform 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var(--border);color:var(--text-muted);justify-content:space-between;align-items:center;padding-top:1rem;font-size:.875rem;display:flex}.video-duration,.video-date{align-items:center;gap:.375rem;display:flex}.modal{-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:2000;background:#0f172acc;justify-content:center;align-items:center;width:100%;height:100%;padding:2rem;display:none;position:fixed;top:0;left:0}.modal.active{display:flex}.modal-content{background:var(--bg-primary);border-radius:24px;width:100%;max-width:1200px;max-height:90vh;position:relative;overflow-y:auto;box-shadow:0 25px 50px -12px #00000040}.modal-close{background:var(--bg-primary);border:1px solid var(--border);cursor:pointer;z-index:10;width:48px;height:48px;color:var(--text-primary);border-radius:50%;justify-content:center;align-items:center;font-size:1.5rem;transition:all 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span{align-items:center;gap:.5rem;display:flex}.footer{background:var(--bg-primary);border-top:1px solid var(--border);margin-top:6rem;padding:4rem 2rem}.footer-content{text-align:center;max-width:1400px;margin:0 auto}.footer-title{color:var(--text-primary);margin-bottom:.75rem;font-size:1.125rem;font-weight:700}.footer-text{color:var(--text-muted);font-size:.9375rem;line-height:1.7}.organizers-logos{flex-wrap:wrap;justify-content:center;align-items:center;gap:3rem;min-height:100px;display:flex}.organizer-logo{object-fit:contain;object-position:center;filter:grayscale(20%);opacity:.85;width:auto;max-width:220px;height:70px;transition:transform .25s,filter .25s,opacity .25s}.organizer-logo:hover{filter:grayscale(0%);opacity:1;transform:translateY(-3px)scale(1.05)}.organizer-logo--hallym{margin-top:0}.organizer-logo--gangwon{margin-top:3px}@media (width<=1200px){.hero-heading{font-size:3.5rem}.section-title{font-size:3rem}.about-grid,.categories-grid,.video-grid{grid-template-columns:repeat(2,1fr)}}@media (width<=768px){.navbar-content{flex-direction:column;gap:1rem;padding:1rem 1.5rem}.navbar-links{gap:1rem}.hero-main{padding:4rem 0 3rem}.hero-inner{padding:0 1.5rem}.hero-heading{font-size:2.5rem}.hero-text{font-size:1rem}.about-section,.categories-section{padding:4rem 1.5rem}.section-title{font-size:2rem}.about-grid,.categories-grid,.video-grid{grid-template-columns:1fr;gap:1.5rem}.about-description{grid-template-columns:1fr;gap:2rem;padding:2rem}.lectures-title{font-size:2.5rem}.lectures-subtitle{font-size:1rem}.filter-section{flex-direction:column;align-items:stretch}.filter-buttons{flex-direction:column}.filter-btn{width:100%}}@media (width<=480px){.hero-heading{font-size:2rem}.hero-actions{flex-direction:column;width:100%}.btn-primary,.btn-secondary{justify-content:center;width:100%}.modal-info{padding:1.5rem}.modal-title{font-size:1.5rem}}