@import"https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap";:root{--font-scale: 1;--bg-main: #f8fafc;--card-bg: #ffffff;--card-border: #e2e8f0;--card-border-hover: #cbd5e1;--primary: #4f46e5;--primary-hover: #4338ca;--primary-light: #eef2ff;--accent: #d97706;--text-main: #0f172a;--text-muted: #475569;--text-subtle: #64748b;--input-bg: #ffffff;--input-border: #cbd5e1;--input-focus: #4f46e5;--shadow-xs: 0 1px 2px rgba(0, 0, 0, .04);--shadow-sm: 0 1px 3px rgba(0, 0, 0, .05), 0 1px 2px rgba(0, 0, 0, .03);--shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, .08), 0 8px 10px -6px rgba(0, 0, 0, .04)}@keyframes pulse{0%{transform:scale(1)}50%{transform:scale(1.05)}to{transform:scale(1)}}html{font-size:calc(16px * var(--font-scale, 1))}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Plus Jakarta 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ease;box-shadow:var(--shadow-xs)}.filter-btn:hover{background:#f1f5f9;color:var(--text-main);border-color:var(--card-border-hover)}.filter-btn.active{background:#4f46e5;color:#fff;border-color:#4f46e5;box-shadow:var(--shadow-sm);font-weight:700}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:1.5rem}.card{background-color:var(--card-bg);border:1px solid var(--card-border);border-radius:16px;padding:1.5rem;box-shadow:var(--shadow-sm);transition:transform .2s cubic-bezier(.16,1,.3,1),box-shadow .2s ease,border-color .2s ease;display:flex;flex-direction:column;justify-content:space-between}.card:hover{transform:translateY(-3px);border-color:var(--card-border-hover);box-shadow:var(--shadow-md)}.card h3{font-size:1.15rem;margin-bottom:.5rem;color:var(--text-main);font-weight:700}.card p{color:var(--text-muted);font-size:.9rem;line-height:1.55}.badge{font-size:.78rem;font-weight:700;padding:.25rem .65rem;border-radius:6px;background:var(--primary-light);color:var(--primary);display:inline-block;margin-bottom:.75rem;letter-spacing:.2px}.meta{display:flex;justify-content:space-between;align-items:center;margin-top:1.25rem;padding-top:.85rem;border-top:1px solid var(--card-border);font-size:.82rem;color:var(--text-subtle);font-weight:500}label{display:block;font-size:.82rem;font-weight:700;color:#475569;margin-bottom:.4rem;text-transform:uppercase;letter-spacing:.03em}input[type=text],input[type=password],input[type=email],select,textarea{font-family:inherit;font-size:.95rem;color:var(--text-main);background-color:var(--input-bg);border:1.5px solid var(--input-border);border-radius:10px;padding:.7rem 1rem;width:100%;transition:all .2s cubic-bezier(.16,1,.3,1);box-shadow:var(--shadow-xs)}input[type=text]:focus,input[type=password]:focus,input[type=email]:focus,select:focus,textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 4px #4f46e51f}select{-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2364748b'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right .85rem center;background-size:1.1rem;padding-right:2.5rem}.btn-action{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;background:linear-gradient(135deg,#4f46e5,#6366f1);border:1px solid #4338ca;color:#fff;padding:.65rem 1.35rem;border-radius:10px;font-weight:600;font-size:.9rem;text-decoration:none;cursor:pointer;transition:all .2s cubic-bezier(.16,1,.3,1);box-shadow:0 2px 6px #4f46e540}.btn-action:hover{background:linear-gradient(135deg,#4338ca,#4f46e5);transform:translateY(-1px);box-shadow:0 4px 12px #4f46e559}.btn-action:disabled{opacity:.65;cursor:not-allowed;transform:none}.lesson-container{display:grid;grid-template-columns:1fr;gap:2rem}.video-wrapper{position:relative;padding-bottom:56.25%;height:0;overflow:hidden;border-radius:16px;background:#000;border:1px solid var(--card-border);box-shadow:var(--shadow-md)}.video-wrapper iframe{position:absolute;top:0;left:0;width:100%;height:100%;border:0}.action-bar{display:flex;gap:1rem;margin-top:1rem;flex-wrap:wrap}.qa-section{background:var(--card-bg);border:1px solid var(--card-border);border-radius:16px;padding:1.75rem;margin-top:2rem;box-shadow:var(--shadow-sm)}.qa-card{background:#f8fafc;border-left:4px solid var(--accent);padding:1.1rem 1.25rem;border-radius:0 12px 12px 0;margin-bottom:1rem;border:1px solid var(--card-border);border-left-width:4px}.qa-card h4{font-size:1rem;color:var(--text-main);margin-bottom:.4rem;font-weight:700}.qa-card p{font-size:.9rem;color:var(--text-muted);margin-bottom:.65rem}.timestamp-badge{display:inline-flex;align-items:center;gap:.3rem;background:#fef3c7;color:#92400e;padding:.3rem .75rem;border-radius:8px;font-size:.8rem;font-weight:700;text-decoration:none;transition:background .2s}.timestamp-badge:hover{background:#fde68a}.lesson-nav{display:flex;justify-content:space-between;margin-top:2rem;padding-top:1.5rem;border-top:1px solid var(--card-border)}.splash-screen-container{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:80vh;text-align:center;animation:fadeIn .4s ease-out;background:var(--bg-main)}.splash-logo{width:130px;height:130px;border-radius:28px;box-shadow:0 12px 32px #4f46e540;animation:pulseGlow 2.5s infinite ease-in-out}@keyframes pulseGlow{0%,to{transform:scale(1);box-shadow:0 12px 32px #4f46e540}50%{transform:scale(1.04);box-shadow:0 18px 42px #4f46e573}}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.hamburger-btn{background:#fff;border:1.5px solid var(--card-border);color:var(--text-main);width:42px;height:42px;border-radius:10px;display:inline-flex;align-items:center;justify-content:center;font-size:1.3rem;cursor:pointer;transition:all .2s ease;box-shadow:var(--shadow-xs)}.hamburger-btn:hover{background:var(--primary-light);border-color:var(--primary);color:var(--primary);transform:scale(1.04)}.sidebar-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#0f172a73;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:999;animation:fadeIn .2s ease}.app-layout-with-sidebar{min-height:100vh;background:var(--bg-main);transition:padding-left .3s ease}.sidebar-drawer{position:fixed;top:0;left:0;width:260px;height:100vh;background:#fff;border-right:1px solid var(--card-border);z-index:1000;display:flex;flex-direction:column;box-shadow:4px 0 20px #0f172a0d;transition:transform .3s cubic-bezier(.16,1,.3,1);overflow-y:auto}@media (max-width: 991px){.sidebar-drawer{transform:translate(-100%)}.sidebar-drawer.open{transform:translate(0)}.app-layout-with-sidebar{padding-left:0}}@media (min-width: 992px){.sidebar-drawer{transform:translate(0)!important;box-shadow:none}.sidebar-overlay,.sidebar-close-btn,.hamburger-btn{display:none!important}.app-layout-with-sidebar{padding-left:260px}}.sidebar-header{padding:1.25rem 1rem;background:linear-gradient(135deg,#1e1b4b,#312e81);border-bottom:1px solid #3730a3;position:relative;color:#fff}.sidebar-close-btn{position:absolute;top:1rem;right:1rem;background:#ffffff26;border:none;color:#fff;width:30px;height:30px;border-radius:50%;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:.9rem;transition:background .2s,color .2s}.sidebar-close-btn:hover{background:#fee2e2;color:#dc2626}.sidebar-student-card{display:flex;align-items:center;gap:1rem}.student-avatar{width:48px;height:48px;border-radius:14px;background:linear-gradient(135deg,#4f46e5,#7c3aed);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:1.3rem;box-shadow:0 4px 12px #0003}.student-info-name{font-size:1.15rem;font-weight:800;color:#fff;line-height:1.2;margin-bottom:.25rem}.student-info-id{display:block;font-size:.72rem;font-weight:600;color:#c7d2fe;background:transparent;padding:0;border-radius:0;margin-top:.15rem}.sidebar-menu{padding:1.25rem .85rem;display:flex;flex-direction:column;gap:.4rem;flex:1}.sidebar-item{display:flex;align-items:center;justify-content:space-between;padding:.8rem 1rem;border-radius:10px;color:#334155;font-size:.92rem;font-weight:600;cursor:pointer;transition:all .2s ease;background:transparent;border:none;width:100%;text-align:left}.sidebar-item:hover{background:#f1f5f9;color:var(--text-main);transform:translate(3px)}.sidebar-item.active{background:var(--primary-light);color:var(--primary);border-left:3.5px solid var(--primary);font-weight:700}.sidebar-item-pill{background:#4f46e526;color:var(--primary);font-size:.75rem;font-weight:700;padding:.15rem .55rem;border-radius:12px}.sidebar-divider{border:0;border-top:1px solid var(--card-border);margin:.85rem 0}.sidebar-logout{color:#dc2626}.sidebar-logout:hover{background:#fef2f2;color:#b91c1c}.pin-keypad-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:.45rem;margin-top:.5rem}.pin-key-btn{background:#f8fafc;border:1.5px solid var(--card-border);color:var(--text-main);height:44px;border-radius:10px;font-size:1.15rem;font-weight:700;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .15s ease;-webkit-user-select:none;user-select:none;box-shadow:var(--shadow-xs)}.pin-key-btn:hover{background:var(--primary);border-color:var(--primary);color:#fff;transform:translateY(-2px);box-shadow:0 4px 12px #4f46e54d}.pin-key-btn:active{transform:scale(.95)}.pin-key-btn.action-btn{font-size:.85rem;color:var(--text-subtle);background:#f1f5f9}.pin-key-btn.action-btn:hover{background:#fee2e2;color:#dc2626;border-color:#fca5a5}