:root{--purple:#335bf1;--teal:#087b88;--paper:#f3f9ff;--ink:#14233f;--muted:#53657b;--line:#dce8f4}body{background:var(--paper);color:var(--ink)}.app-topbar{height:68px;box-shadow:0 3px 18px #1666ba0b;background:#fff}.app-topbar .brand{letter-spacing:-.04em;font-size:1.35rem}.app-topbar form{margin:0}.brand-mark{background:linear-gradient(140deg,#2563eb,#1eb9e3);box-shadow:0 4px 10px #2869e72b}.nav-toggle{font-size:1.35rem;color:#264b9f;background:#eaf3ff;border:1px solid #d7e7ff;padding:5px 11px}.user-avatar{display:grid;place-items:center;width:34px;height:34px;background:#e4f8f5;color:#087f73;border-radius:11px;font-weight:800}.user-chip{display:flex;gap:8px;align-items:center;font-size:.85rem;font-weight:700;color:#183050}.header-chat{font-weight:700;font-size:.85rem;color:#335bf1;position:relative}.logout-power{color:#dd303a;background:#fff0f1;font-size:1.35rem;padding:2px 10px}.app-sidebar{--bs-offcanvas-width:264px;width:264px;background:#fff;border-right:1px solid #dce8f4;padding:18px 12px;overflow-y:auto}.sidebar-role{display:flex;gap:12px;align-items:center;padding:12px 10px 22px}.sidebar-role-icon{width:40px;height:40px;border-radius:12px;background:#e5f4ff;color:#2373cf;display:grid;place-items:center;font-size:22px;flex-shrink:0}.role-copy strong{font-size:.85rem;display:block}.role-copy small{font-size:.7rem;color:var(--muted)}.sidebar-links a{display:flex;align-items:center;gap:12px;padding:12px 11px;margin-bottom:6px;border-radius:12px;color:#314d70;font-size:.86rem;font-weight:650;min-height:46px}.sidebar-links a:hover{background:#eff7ff;color:#215bbd}.sidebar-links a.active{color:#fff;background:linear-gradient(100deg,#2869ec,#1e9dde);box-shadow:0 5px 12px #2e82e523}.menu-icon{width:28px;flex-shrink:0;text-align:center;font-size:21px;color:#358fc4}.active .menu-icon{color:white}.sidebar-bottom{display:flex;gap:9px;padding:20px 12px;color:#668198;font-size:.75rem}.sidebar-bottom span{color:#12a38d}.app-main{min-width:0;transition:margin-left .2s}.workspace .app-main{margin-left:264px}.app-main>.footer{margin-top:45px;background:#e9f4ff;border-top:1px solid #d8e6f5;color:#3c5676}.app-main>.footer strong{color:#183b6b}.app-main>.footer a{color:#2457ac}.hero{background:linear-gradient(120deg,#dff7ff,#edf3ff 65%,#eee6ff);border-color:#d0e9fa}.hero p{color:#415d7a}.card{background:#fff;border-color:#dce8f4;box-shadow:0 5px 18px #25476c05}.form-control,.form-select,.account-form input{background-color:white!important;color:#111827!important;border-color:#c4d4e6}.form-control::placeholder{color:#66758a;opacity:1}.form-label{color:#18283e}.form-check-label{color:#18283e}.page-head{background:linear-gradient(105deg,#fff,#eff9ff);border-color:#dce8f4;padding:25px 0}.course-hero{background:linear-gradient(110deg,#1764d6,#1672af);color:white}.course-hero .muted{color:#e5f2ff!important}.course-art{background:linear-gradient(125deg,#2863dc,#3f93e7)}.course-art[data-category='web-development']{background:linear-gradient(130deg,#254fe3,#439df4)}.course-art[data-category='python-programming']{background:linear-gradient(130deg,#00867b,#25ba9b)}.course-art[data-category='business']{background:linear-gradient(130deg,#8244dc,#d369c4)}.course-art[data-category='design']{background:linear-gradient(130deg,#ed742b,#f5b23c)}.course-art[data-category='data-science']{background:linear-gradient(130deg,#057ebd,#2abacf)}.progress-bar{background:linear-gradient(90deg,#2b67ed,#19a9d4)}.pill{background:#e9f3ff;color:#235baa}.admin-layout{padding-left:24px;padding-right:24px}.admin-page-header{margin-bottom:22px}.admin-main .stat-card{border-top:3px solid #40a9e5}.admin-label{color:#ccecff}.admin-login-intro{background:linear-gradient(130deg,#155ed2,#1192b0)}.admin-login-intro p,.admin-login-features small{color:#e4f8ff}.admin-login-intro h1 span{color:#bdffef}.admin-login-note{background:#edf7ff}.chat-launcher{position:fixed;right:22px;bottom:22px;display:flex;align-items:center;gap:8px;border-radius:100px;padding:13px 20px;color:white;background:linear-gradient(120deg,#285bea,#13a2c0);box-shadow:0 8px 25px #166bd842;z-index:1030;font-weight:750}.chat-launcher:hover{color:#fff}.chat-launcher>span:first-child{font-size:24px;line-height:1}.chat-unread[hidden]{display:none!important}.media-panel{padding:20px;background:#edf8ff;border:1px solid #c8e6f8;border-radius:15px;margin:20px 0}.slide-stage{background:#dceaf8;display:grid;place-items:center;border-radius:12px;overflow:hidden;min-height:180px}.slide-stage img{width:100%;height:auto;max-height:65vh;object-fit:contain}.slide-dots{display:flex;gap:6px;flex-wrap:wrap}.slide-dots button{border:1px solid #c8dcee;border-radius:8px;background:#fff;color:#244d7b;min-width:34px;padding:5px}.slide-dots button.active{background:#2869ec;color:#fff}.slide-dots button.viewed{border-color:#0aa487;box-shadow:inset 0 -3px #0aa487}.media-status{font-size:.8rem;color:#3b5879}.video-resume{font-size:.8rem}.chat-layout{display:grid;grid-template-columns:285px minmax(0,1fr);gap:20px}.chat-contacts{overflow:hidden;align-self:start}.chat-contact{display:block;padding:14px 16px;border-bottom:1px solid var(--line);color:#233b5b}.chat-contact.active{background:#e7f2ff;border-left:4px solid #276cec}.chat-contact small{display:block;color:#647992;margin-top:3px}.chat-window{min-width:0;overflow:hidden}.chat-heading{padding:20px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;gap:12px}.chat-history{height:420px;overflow-y:auto;padding:22px;background:linear-gradient(120deg,#f5fbff,#f3f6ff);display:flex;flex-direction:column;gap:13px;scroll-behavior:smooth}.chat-message{max-width:82%;align-self:flex-start;padding:12px 15px;background:#fff;border:1px solid #dce8f4;border-radius:3px 15px 15px 15px;overflow-wrap:anywhere}.chat-message.mine{align-self:flex-end;background:#e1f1ff;border-color:#c4e0fb;border-radius:15px 3px 15px 15px}.chat-message.pending{opacity:.7}.message-body{white-space:pre-wrap;color:#14233f;font-size:.94rem;line-height:1.6}.message-meta{font-size:.65rem;color:#58708a;margin-top:6px}.chat-compose{padding:15px;border-top:1px solid var(--line);background:#fff}.chat-compose textarea{resize:vertical;min-height:70px;max-height:180px}.presence-dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:#9aaab9;margin-right:6px}.presence-dot.online{background:#0ba887}.roster-entry{padding:13px 16px;border-bottom:1px solid var(--line)}.chat-empty{padding:65px 25px;text-align:center}.table-responsive{max-width:100%}.lesson-content{overflow-wrap:anywhere}.view-report th{white-space:nowrap}.viewing-hint{background:#eff9f5;border:1px solid #c3e9d7;padding:14px;border-radius:10px;font-size:.85rem}
@media(min-width:992px){.app-sidebar{position:fixed!important;top:68px;bottom:0;left:0;visibility:visible!important;transform:none!important;z-index:1025}.nav-collapsed .app-sidebar{width:90px}.nav-collapsed .app-main{margin-left:90px}.nav-collapsed .sidebar-role{justify-content:center;padding-left:0;padding-right:0}.nav-collapsed .role-copy,.nav-collapsed .sidebar-bottom{display:none}.nav-collapsed .sidebar-links a{flex-direction:column;gap:3px;padding:10px 1px;font-size:.6rem;text-align:center;line-height:1.25}.nav-collapsed .menu-label{max-width:68px;overflow-wrap:anywhere}.nav-collapsed .sidebar-links .badge{font-size:.55rem}.app-sidebar .offcanvas-header{display:none}}
@media(max-width:1199px){.chat-layout{grid-template-columns:230px minmax(0,1fr)}.chat-history{height:400px}.brand{white-space:nowrap}}
@media(max-width:991px){.workspace .app-main{margin-left:0}.app-sidebar{top:0;bottom:0}.chat-layout{grid-template-columns:1fr}.chat-contacts .contact-list{max-height:200px;overflow:auto}.chat-history{height:48vh;min-height:280px}.chat-contacts{display:grid;grid-template-columns:1fr}.chat-launcher{right:15px;bottom:15px;padding:12px 16px}.app-topbar .brand{font-size:1.05rem}.brand-mark{width:30px;height:30px}.admin-layout{padding-left:16px;padding-right:16px}}
@media(max-width:575px){.app-topbar{height:62px}.nav-toggle{padding:4px 8px;font-size:1.15rem}.user-chip{display:none}.header-chat{font-size:1rem}.app-topbar .container-fluid{gap:5px}.chat-heading{padding:15px}.chat-history{padding:14px}.chat-message{max-width:92%}.chat-compose{padding:12px}.media-panel{padding:12px}.slide-stage{min-height:120px}.app-main .container.py-5{padding-top:24px!important;padding-bottom:24px!important}}
@media print{.app-sidebar,.app-topbar,.chat-launcher{display:none!important}.workspace .app-main{margin-left:0!important}}
/* Keep the sidebar and content aligned throughout desktop menu transitions. */
@media(min-width:992px){.app-sidebar{background-color:#fff!important;transition:width .2s;overflow-x:hidden}}