:root{--color-primary:#dc2626;--color-primary-dark:#991b1b;--color-primary-light:#f87171;--color-secondary:#0f172a;--color-accent:#f43f5e;--color-success:#10b981;--color-danger:#ef4444;--color-warning:#f59e0b;--color-ink:#1e293b;--color-muted:#64748b;--color-bg:#f8fafc;--color-surface:#fff;--color-border:#e2e8f0;--font:"Outfit", system-ui, -apple-system, sans-serif;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:24px;--shadow-sm:0 1px 2px #0000000d;--shadow-md:0 4px 6px -1px #0000001a, 0 2px 4px -1px #0000000f;--shadow-lg:0 10px 15px -3px #0000001a, 0 4px 6px -2px #0000000d;--shadow-xl:0 20px 25px -5px #0000001a, 0 10px 10px -5px #0000000a;--glass-bg:#ffffffb3;--glass-border:#ffffff4d}[data-theme=dark]{--color-bg:#0f172a;--color-surface:#1e293b;--color-ink:#f1f5f9;--color-muted:#94a3b8;--color-border:#334155;--glass-bg:#1e293bb3;--glass-border:#ffffff0d;--shadow-sm:0 1px 2px #00000080;--shadow-md:0 4px 6px -1px #0009;--shadow-lg:0 10px 25px -3px #000000b3}*,:before,:after{box-sizing:border-box}html,body{min-height:100%;font-family:var(--font);color:var(--color-ink);background:var(--color-bg);-webkit-font-smoothing:antialiased;margin:0;font-size:16px;line-height:1.6;transition:background-color .3s,color .3s}#root{min-height:100vh}a{color:var(--color-primary);text-decoration:none;transition:all .2s}a:hover{color:var(--color-primary-dark)}button{font:inherit;cursor:pointer;transition:all .2s cubic-bezier(.4,0,.2,1)}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--color-border);border-radius:10px}::-webkit-scrollbar-thumb:hover{background:var(--color-muted)}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes pulse-soft{0%{opacity:1;transform:scale(1)}50%{opacity:.8;transform:scale(1.05)}to{opacity:1;transform:scale(1)}}.page-loading{background:var(--color-bg);place-items:center;min-height:100vh;display:grid}.page-loading-inner{border:4px solid var(--color-border);border-top-color:var(--color-primary);border-radius:50%;width:48px;height:48px;animation:.8s cubic-bezier(.6,.2,.4,1) infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.spin{animation:1s linear infinite spin}.auth-page{background:radial-gradient(circle at 0% 0%, #dc26260d 0%, transparent 50%), radial-gradient(circle at 100% 100%, #0f172a0d 0%, transparent 50%), var(--color-bg);justify-content:center;align-items:center;min-height:100vh;padding:24px;display:flex;position:relative;overflow:hidden}[data-theme=dark] .auth-page{background:radial-gradient(circle at 0% 0%, #dc26261a 0%, transparent 50%), radial-gradient(circle at 100% 100%, #0f172a1a 0%, transparent 50%), var(--color-bg)}.auth-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-xl);width:100%;max-width:480px;box-shadow:var(--shadow-xl);z-index:1;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);padding:48px;animation:.6s cubic-bezier(.16,1,.3,1) fadeIn;position:relative}.auth-brand{text-align:center;flex-direction:column;align-items:center;margin-bottom:40px;display:flex}.auth-logo{background:linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);color:#fff;border-radius:20px;place-items:center;width:72px;height:72px;margin-bottom:24px;display:grid;box-shadow:0 8px 16px -4px #dc26264d}.auth-title{color:var(--color-ink);letter-spacing:-.04em;margin:0;font-size:2rem;font-weight:800}.auth-sub{color:var(--color-muted);margin:12px 0 0;font-size:1rem}.form{flex-direction:column;gap:24px;display:flex}.form-grid{grid-template-columns:1fr 1fr;gap:24px;display:grid}.field{flex-direction:column;gap:10px;display:flex}.field label{color:var(--color-ink);margin-left:2px;font-size:.9rem;font-weight:600}.field input,.field select,.field textarea{border:2px solid var(--color-border);border-radius:var(--radius-lg);background:var(--color-bg);color:var(--color-ink);padding:14px 18px;font-size:1rem;transition:all .3s cubic-bezier(.4,0,.2,1)}.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--color-primary);background:var(--color-surface);outline:none;transform:translateY(-1px);box-shadow:0 0 0 4px #dc26261a}.btn{border-radius:var(--radius-lg);white-space:nowrap;border:none;justify-content:center;align-items:center;gap:12px;padding:14px 28px;font-size:1rem;font-weight:700;transition:all .3s cubic-bezier(.4,0,.2,1);display:inline-flex}.btn-primary{background:linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);color:#fff;box-shadow:0 4px 12px #dc262633}.btn-primary:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 8px 20px #dc26264d}.btn-primary:active:not(:disabled){transform:translateY(0)}.btn-muted{background:var(--color-surface);border:1px solid var(--color-border);color:var(--color-ink)}.btn-muted:hover{background:var(--color-bg);border-color:var(--color-muted)}.btn-ghost{color:var(--color-muted);background:0 0}.btn-ghost:hover{color:var(--color-primary);background:#dc26260d}.dashboard{background:var(--color-bg);flex-direction:column;min-height:100vh;display:flex}.dashboard-header{background:var(--glass-bg);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-bottom:1px solid var(--color-border);z-index:100;justify-content:space-between;align-items:center;height:90px;padding:0 48px;display:flex;position:sticky;top:0}.dashboard-brand{align-items:center;gap:16px;text-decoration:none;display:flex}.dashboard-brand-mark{background:linear-gradient(to bottom, var(--color-primary), var(--color-accent));border-radius:5px;width:10px;height:40px}.dashboard-product{color:var(--color-ink);letter-spacing:-.02em;font-size:1.25rem;font-weight:800}.dashboard-meta{color:var(--color-muted);text-transform:uppercase;letter-spacing:.05em;font-size:.85rem;font-weight:600}.dashboard-user{align-items:center;gap:24px;display:flex}.dashboard-username{color:var(--color-ink);font-weight:700}.dashboard-body{flex-direction:column;flex:1;width:100%;max-width:1400px;margin:0 auto;padding:0 40px;display:flex}.dashboard-nav{scrollbar-width:none;gap:12px;margin-top:24px;padding:16px 0;display:flex;overflow-x:auto}.dashboard-nav::-webkit-scrollbar{display:none}.dashboard-nav-link{border-radius:var(--radius-lg);color:var(--color-muted);white-space:nowrap;border:1px solid #0000;padding:12px 24px;font-size:1rem;font-weight:600;transition:all .3s cubic-bezier(.4,0,.2,1)}.dashboard-nav-link:hover{background:var(--color-surface);color:var(--color-primary);border-color:var(--color-border)}.dashboard-nav-link.is-active{background:var(--color-primary);color:#fff;box-shadow:0 8px 16px #dc262633}.dashboard-main{padding:40px 0;animation:.6s cubic-bezier(.16,1,.3,1) fadeIn}.page-heading{color:var(--color-ink);letter-spacing:-.04em;margin:0 0 16px;font-size:2.25rem;font-weight:800}.page-lead{color:var(--color-muted);max-width:70ch;margin:0 0 40px;font-size:1.1rem}.table-wrap{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-xl);box-shadow:var(--shadow-lg);overflow:hidden}.table{border-collapse:collapse;width:100%}.table th{background:var(--color-bg);text-align:left;text-transform:uppercase;letter-spacing:.1em;color:var(--color-muted);border-bottom:2px solid var(--color-border);padding:20px 24px;font-size:.85rem;font-weight:800}.table td{border-bottom:1px solid var(--color-border);color:var(--color-ink);padding:20px 24px;font-size:1rem}.table tbody tr:last-child td{border-bottom:none}.table tbody tr{transition:all .2s}.table tbody tr:hover td{background:#dc262605}.stat-list{grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:32px;margin-bottom:40px;display:grid}.stat-list>div{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-xl);box-shadow:var(--shadow-md);padding:32px;transition:all .4s cubic-bezier(.175,.885,.32,1.275)}.stat-list>div:hover{box-shadow:var(--shadow-xl);border-color:var(--color-primary-light);transform:translateY(-8px)scale(1.02)}.stat-list dt{color:var(--color-muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:12px;font-size:.9rem;font-weight:700}.stat-list dd{color:var(--color-primary);letter-spacing:-.02em;margin:0;font-size:2.75rem;font-weight:900}.admin-actions{grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:32px;margin-top:16px;display:grid}.admin-action-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-xl);color:var(--color-ink);height:100%;box-shadow:var(--shadow-md);padding:32px;text-decoration:none;transition:all .4s cubic-bezier(.165,.84,.44,1);display:block;position:relative;overflow:hidden}.admin-action-card:before{content:"";background:linear-gradient(90deg, var(--color-primary), var(--color-accent));opacity:0;width:100%;height:4px;transition:opacity .3s;position:absolute;top:0;left:0}.admin-action-card:hover{box-shadow:var(--shadow-xl);border-color:#0000;transform:translateY(-8px)}.admin-action-card:hover:before{opacity:1}.admin-action-card strong{color:var(--color-ink);margin-bottom:12px;font-size:1.25rem;font-weight:800;display:block}.admin-action-card span{color:var(--color-muted);font-size:1rem;line-height:1.6}.action-card-header{align-items:center;gap:20px;margin-bottom:16px;display:flex}.action-icon{color:var(--color-primary);border-radius:var(--radius-lg);background:#dc26261a;padding:12px}.modal-backdrop{-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);z-index:1000;background:#0f172acc;place-items:center;padding:24px;display:grid;position:fixed;inset:0}.modal-panel{background:var(--color-surface);border-radius:var(--radius-xl);width:100%;max-width:560px;padding:48px;position:relative;box-shadow:0 30px 60px -12px #0000004d}.modal-panel--rate{border:1px solid var(--color-border);max-width:520px;box-shadow:var(--shadow-xl);padding:28px}.modal-header{border-bottom:1px solid var(--color-border);justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:20px;padding-bottom:16px;display:flex}.modal-title{letter-spacing:-.02em;color:var(--color-ink);margin:0;font-size:1.25rem;font-weight:800}.modal-subtitle{color:var(--color-muted);margin:6px 0 0;font-size:.95rem;font-weight:600}.modal-close{border:1px solid var(--color-border);background:var(--color-surface);width:36px;height:36px;color:var(--color-muted);border-radius:10px;place-items:center;padding:0;font-size:22px;line-height:1;display:grid}.modal-close:hover:not(:disabled){background:var(--color-bg);color:var(--color-ink)}.modal-close:focus-visible{border-color:var(--color-primary);outline:none;box-shadow:0 0 0 4px #dc26261f}.rating-form{flex-direction:column;gap:18px;display:flex}.rating-grid{grid-template-columns:1fr 1fr;gap:14px 22px;display:grid}.rating-field{flex-direction:column;gap:10px;display:flex}.rating-label{color:var(--color-ink);font-size:.9rem;font-weight:700}.rating-stars{grid-template-columns:repeat(5,34px);justify-content:start;gap:8px;display:grid}.rating-star{border:1px solid var(--color-border);background:var(--color-bg);color:#94a3b8;border-radius:10px;place-items:center;width:34px;height:34px;padding:0;font-size:16px;line-height:1;display:grid}[data-theme=dark] .rating-star{color:#64748b}.rating-star:hover:not(:disabled){background:var(--color-surface);color:#64748b;border-color:#cbd5e1}.rating-star.is-on{color:var(--color-primary);background:#dc26261a;border-color:#dc262659}.rating-star:focus-visible{border-color:var(--color-primary);outline:none;box-shadow:0 0 0 4px #dc26261f}.rating-feedback{flex-direction:column;gap:10px;display:flex}.rating-feedback label{color:var(--color-ink);margin-left:2px;font-size:.9rem;font-weight:700}.rating-feedback textarea{resize:vertical;min-height:92px}.modal-actions{justify-content:flex-end;gap:10px;padding-top:8px;display:flex}.modal-actions .btn{border-radius:12px;padding:12px 18px;font-weight:800}@media (width<=520px){.modal-panel--rate{padding:20px}.rating-grid{grid-template-columns:1fr}.rating-stars{grid-template-columns:repeat(5,32px)}.rating-star{border-radius:10px;width:32px;height:32px}}.student-chat-panel{background:var(--color-surface);border-radius:var(--radius-xl);border:1px solid var(--color-border);box-shadow:var(--shadow-xl);flex-direction:column;height:650px;display:flex;overflow:hidden}.student-chat-toolbar{background:var(--color-surface);border-bottom:1px solid var(--color-border);padding:24px 32px}.student-chat-messages{background:var(--color-bg);flex-direction:column;flex:1;gap:20px;padding:32px;display:flex;overflow-y:auto}.student-msg{max-width:80%;box-shadow:var(--shadow-sm);border-radius:24px;padding:16px 24px;font-size:1rem}.student-msg:not(.is-mine){background:var(--color-surface);color:var(--color-ink);border-bottom-left-radius:4px}.student-msg.is-mine{background:linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);color:#fff;border-bottom-right-radius:4px;align-self:flex-end}.badge{text-transform:uppercase;letter-spacing:.05em;border-radius:100px;padding:4px 12px;font-size:.75rem;font-weight:700;display:inline-flex}.badge-success{color:#059669;background:#10b9811a}.badge-warning{color:#d97706;background:#f59e0b1a}.badge-danger{color:#dc2626;background:#ef44441a}@media (width<=1024px){.dashboard-header,.dashboard-body{padding:0 32px}}@media (width<=768px){.dashboard-header{height:80px;padding:0 20px}.dashboard-body{padding:0 20px}.form-grid{grid-template-columns:1fr}.auth-card{padding:40px 24px}.page-heading{font-size:1.75rem}}