:root{--primary:#c200ff;--secondary:#ff007b;--bg-color:#0b071a;--glass-bg:#1e143266;--glass-border:#ffffff1a;--text-primary:#fff;--text-secondary:#a09eb5}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-color);color:var(--text-primary);min-height:100vh;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;position:relative;overflow-x:hidden}body:before{content:"";z-index:-1;pointer-events:none;background:radial-gradient(circle at 20% 30%,#c200ff26 0%,#0000 40%),radial-gradient(circle at 80% 70%,#ff007b26 0%,#0000 40%);width:100vw;height:100vh;position:absolute;top:0;left:0}.app-container{grid-template-rows:auto 1fr;max-width:1200px;min-height:100vh;margin:0 auto;padding:2rem;display:grid}.header{background:var(--glass-bg);-webkit-backdrop-filter:blur(12px);border:1px solid var(--glass-border);border-radius:20px;justify-content:space-between;align-items:center;margin-bottom:3rem;padding:1rem 2rem;display:flex;box-shadow:0 8px 32px #0003}.logo{background:linear-gradient(135deg, var(--primary), var(--secondary));-webkit-text-fill-color:transparent;-webkit-background-clip:text;align-items:center;gap:1rem;font-size:1.5rem;font-weight:700;display:flex}.logo-img{object-fit:cover;border-radius:50%;width:45px;height:45px;box-shadow:0 0 20px #c200ff66}.nav-links{gap:2rem;display:flex}.nav-link{color:var(--text-secondary);cursor:pointer;font-weight:500;text-decoration:none;transition:all .3s}.nav-link:hover,.nav-link.active{color:var(--text-primary);text-shadow:0 0 10px #c200ff80}.auth-btn{background:linear-gradient(135deg, var(--primary), var(--secondary));color:#fff;cursor:pointer;border:none;border-radius:12px;align-items:center;gap:.5rem;padding:.75rem 1.5rem;font-weight:600;transition:all .3s;display:flex;box-shadow:0 4px 15px #c200ff4d}.auth-btn:hover{transform:translateY(-2px);box-shadow:0 6px 20px #c200ff80}.main-content{grid-template-columns:1fr;gap:2rem;animation:.5s fadeIn;display:grid}.glass-card{background:var(--glass-bg);-webkit-backdrop-filter:blur(12px);border:1px solid var(--glass-border);border-radius:24px;padding:2rem;transition:transform .3s,border-color .3s;box-shadow:0 8px 32px #0003}.glass-card:hover{border-color:#c200ff4d;transform:translateY(-5px)}.hero-section{text-align:center;padding:4rem 2rem}.hero-title{background:linear-gradient(135deg, #fff, var(--text-secondary));-webkit-text-fill-color:transparent;-webkit-background-clip:text;margin-bottom:1rem;font-size:3.5rem;font-weight:800}.hero-subtitle{color:var(--text-secondary);max-width:600px;margin:0 auto 3rem;font-size:1.2rem;line-height:1.6}.search-container{gap:1rem;max-width:600px;margin:0 auto;display:flex}.search-input{border:1px solid var(--glass-border);color:#fff;background:#0003;border-radius:12px;outline:none;flex:1;padding:1rem 1.5rem;font-size:1rem;transition:all .3s}.search-input:focus{border-color:var(--primary);box-shadow:0 0 15px #c200ff33}.custom-dropdown-container{width:200px;position:relative}.custom-dropdown-header{border:1px solid var(--glass-border);color:#fff;cursor:pointer;background:#0003;border-radius:12px;justify-content:space-between;align-items:center;height:100%;padding:1rem 1.5rem;font-size:1rem;transition:all .3s;display:flex}.custom-dropdown-header:hover{border-color:var(--primary)}.custom-dropdown-list{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid var(--glass-border);z-index:100;background:#141419f2;border-radius:12px;position:absolute;top:calc(100% + 8px);left:0;right:0;overflow:hidden;box-shadow:0 10px 30px #00000080}.custom-dropdown-item{cursor:pointer;color:var(--text-secondary);padding:1rem 1.5rem;transition:all .2s}.custom-dropdown-item:hover{color:#fff;background:#c200ff26}.custom-dropdown-item.selected{color:#fff;background:linear-gradient(135deg,#c200ff33,#ff007b33);font-weight:500}.pagination{border-top:1px solid var(--glass-border);justify-content:center;align-items:center;gap:8px;margin-top:2rem;padding-top:1.5rem;display:flex}.page-btn,.page-num{border:1px solid var(--glass-border);color:#fff;cursor:pointer;background:#0000004d;border-radius:8px;padding:8px 12px;font-family:inherit;transition:all .2s}.page-btn:hover:not(:disabled),.page-num:hover:not(.active){border-color:var(--primary);background:#c200ff26}.page-btn:disabled{opacity:.5;cursor:not-allowed}.page-num.active{background:linear-gradient(135deg, var(--primary), var(--secondary));border:none;font-weight:700}.search-btn{background:linear-gradient(135deg, var(--primary), var(--secondary));color:#fff;cursor:pointer;border:none;border-radius:12px;padding:0 2rem;font-weight:600;transition:all .3s}.search-btn:hover{transform:scale(1.05);box-shadow:0 4px 15px #c200ff66}.subjects-grid{grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:1rem;margin-top:2rem;display:grid}.subject-card{cursor:pointer;background:#c200ff0d;border:1px solid #c200ff33;border-radius:16px;flex-direction:column;gap:.5rem;padding:1rem;transition:all .3s;display:flex}.subject-card:hover{border-color:var(--primary);background:#c200ff26;transform:translateY(-2px)}.subject-card.active{border-color:var(--secondary);background:linear-gradient(135deg,#c200ff33,#ff007b33)}.subject-name{font-size:.95rem;font-weight:600;line-height:1.3}.subject-tag{color:var(--text-secondary);font-family:monospace;font-size:.8rem}.dashboard-grid{grid-template-columns:300px 1fr;gap:2rem;display:grid}.profile-card{text-align:center}.avatar-placeholder{background:linear-gradient(135deg, var(--primary), var(--secondary));border-radius:50%;justify-content:center;align-items:center;width:120px;height:120px;margin:0 auto 1.5rem;font-size:3rem;display:flex;box-shadow:0 0 30px #c200ff66}.profile-name{margin-bottom:.5rem;font-size:1.5rem}.profile-role{color:var(--primary);text-transform:uppercase;letter-spacing:1px;margin-bottom:2rem;font-size:.9rem;font-weight:600}.stats-grid{grid-template-columns:1fr 1fr;gap:1rem;display:grid}.stat-item{border:1px solid var(--glass-border);background:#0003;border-radius:12px;padding:1rem}.stat-value{background:linear-gradient(135deg, var(--primary), var(--secondary));-webkit-text-fill-color:transparent;-webkit-background-clip:text;margin-bottom:.2rem;font-size:1.8rem;font-weight:700}.stat-label{color:var(--text-secondary);font-size:.8rem}.feed-header{border-bottom:1px solid var(--glass-border);justify-content:space-between;align-items:center;margin-bottom:2rem;padding-bottom:1rem;display:flex}.feed-title{font-size:1.5rem;font-weight:600}.file-list{flex-direction:column;gap:1rem;display:flex}.file-item{border:1px solid var(--glass-border);background:#0003;border-radius:16px;justify-content:space-between;align-items:center;padding:1.5rem;transition:all .3s;display:flex}.file-item:hover{background:#c200ff0d;border-color:#c200ff4d}.file-info{align-items:center;gap:1.5rem;display:flex}.file-icon{width:50px;height:50px;color:var(--primary);background:#c200ff1a;border-radius:12px;justify-content:center;align-items:center;font-size:1.5rem;display:flex}.file-details h4{margin-bottom:.3rem;font-size:1.1rem}.file-meta{color:var(--text-secondary);gap:1rem;font-size:.85rem;display:flex}.file-meta span{align-items:center;gap:.4rem;display:flex}.download-btn{border:1px solid var(--glass-border);color:#fff;cursor:pointer;background:#ffffff0d;border-radius:50%;justify-content:center;align-items:center;width:40px;height:40px;transition:all .3s;display:flex}.download-btn:hover{background:var(--primary);border-color:var(--primary);transform:translateY(-2px);box-shadow:0 4px 15px #c200ff66}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}