@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap";:root{--color-bg:#0f0f13;--color-surface:#16161d;--color-surface-2:#1e1e28;--color-border:#ffffff14;--color-border-focus:#6366f199;--color-text:#c5c5d2;--color-text-muted:#6b6b80;--color-text-heading:#f0f0f8;--color-primary:#6366f1;--color-primary-hover:#4f52db;--color-primary-glow:#6366f14d;--color-teacher:#8b5cf6;--color-student:#0ea5e9;--color-success:#10b981;--color-error:#ef4444;--color-warning:#f59e0b;--sidebar-width:240px;--header-height:64px;--radius:12px;--radius-sm:8px;--radius-lg:16px;--shadow-sm:0 1px 3px #0006, 0 1px 2px #0003;--shadow-md:0 4px 16px #0006, 0 2px 6px #0003;--shadow-lg:0 10px 40px #00000080, 0 4px 12px #0000004d;--shadow-glow:0 0 30px #6366f133;color:var(--color-text);background:var(--color-bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;font-family:Inter,system-ui,sans-serif;font-size:15px;line-height:1.6}*,:before,:after{box-sizing:border-box;margin:0;padding:0}body{margin:0;overflow-x:hidden}#root{flex-direction:column;width:100%;min-height:100dvh;display:flex}a{color:inherit;text-decoration:none}button{cursor:pointer;font:inherit;background:0 0;border:none}input{font:inherit}h1,h2,h3{color:var(--color-text-heading);line-height:1.2}.auth-loading{min-height:100dvh;color:var(--color-text-muted);flex-direction:column;justify-content:center;align-items:center;gap:16px;display:flex}.spinner,.btn-spinner{border:2px solid #ffffff26;border-top-color:#fff;border-radius:50%;flex-shrink:0;width:20px;height:20px;animation:.7s linear infinite spin}.btn-spinner{width:16px;height:16px}@keyframes 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float{0%,to{transform:translateY(0)scale(1)}50%{transform:translateY(-30px)scale(1.05)}}.login-container{z-index:1;flex-direction:column;align-items:center;gap:24px;width:100%;max-width:420px;display:flex;position:relative}.login-brand{text-align:center;flex-direction:column;align-items:center;gap:12px;display:flex}.login-logo{filter:drop-shadow(0 0 20px #6366f180);width:64px;height:64px;transition:transform .3s}.login-logo:hover{transform:scale(1.1)rotate(-3deg)}.login-title{color:var(--color-text-heading);letter-spacing:-.5px;font-size:28px;font-weight:700}.login-subtitle{color:var(--color-text-muted);font-size:13px}.login-card{-webkit-backdrop-filter:blur(24px);border-radius:var(--radius-lg);width:100%;box-shadow:var(--shadow-lg), var(--shadow-glow);background:#16161dcc;border:1px solid #ffffff14;flex-direction:column;gap:20px;padding:32px;display:flex}.login-card-title{color:var(--color-text-heading);margin-bottom:-8px;font-size:22px;font-weight:600}.login-card-sub{color:var(--color-text-muted);font-size:13px}.login-error{border-radius:var(--radius-sm);color:#f87171;background:#ef44441a;border:1px solid #ef44444d;align-items:center;gap:8px;padding:12px 14px;font-size:13px;animation:.2s slideDown;display:flex}@keyframes slideDown{0%{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:translateY(0)}}.form-group{flex-direction:column;gap:6px;display:flex}.form-label{color:var(--color-text);font-size:13px;font-weight:500}.input-wrapper{align-items:center;display:flex;position:relative}.input-icon{color:var(--color-text-muted);pointer-events:none;flex-shrink:0;position:absolute;left:12px}.form-input{border:1px solid var(--color-border);border-radius:var(--radius-sm);width:100%;color:var(--color-text-heading);background:#ffffff0a;outline:none;padding:11px 12px 11px 40px;font-size:14px;transition:border-color .2s,background .2s,box-shadow .2s}.form-input::placeholder{color:var(--color-text-muted)}.form-input:focus{border-color:var(--color-border-focus);background:#6366f10d;box-shadow:0 0 0 3px #6366f11f}.form-input:disabled{opacity:.5;cursor:not-allowed}.input-toggle-btn{color:var(--color-text-muted);border-radius:6px;align-items:center;padding:4px;transition:color .2s;display:flex;position:absolute;right:10px}.input-toggle-btn:hover{color:var(--color-text)}.btn-primary{color:#fff;border-radius:var(--radius-sm);background:linear-gradient(135deg,#6366f1,#8b5cf6);justify-content:center;align-items:center;gap:8px;width:100%;padding:12px;font-size:15px;font-weight:600;transition:all .2s;display:flex;position:relative;overflow:hidden;box-shadow:0 4px 16px #6366f14d}.btn-primary:before{content:"";opacity:0;background:linear-gradient(135deg,#7c7ef5,#a78bfa);transition:opacity 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.2s;display:flex}.demo-btn:hover:not(:disabled){color:var(--color-text-heading);background:#ffffff14;border-color:#ffffff26}.demo-btn:disabled{opacity:.5;cursor:not-allowed}.demo-role-badge{color:#fff;border-radius:6px;justify-content:center;align-items:center;width:22px;height:22px;font-size:11px;font-weight:700;display:flex}.demo-role-badge.teacher{background:var(--color-teacher)}.demo-role-badge.student{background:var(--color-student)}.login-footer{color:var(--color-text-muted);font-size:12px}.dashboard-root{background:var(--color-bg);min-height:100dvh;display:flex}.sidebar{width:var(--sidebar-width);background:var(--color-surface);border-right:1px solid var(--color-border);flex-direction:column;flex-shrink:0;height:100dvh;padding:20px 12px;display:flex;position:sticky;top:0;overflow-y:auto}.sidebar-brand{color:var(--color-text-heading);border-bottom:1px solid var(--color-border);align-items:center;gap:10px;margin-bottom:16px;padding:4px 8px 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var(--color-border);align-items:center;gap:8px;padding-top:16px;display:flex}.sidebar-user{flex:1;align-items:center;gap:10px;min-width:0;display:flex}.sidebar-user-info{min-width:0}.sidebar-user-name{color:var(--color-text-heading);white-space:nowrap;text-overflow:ellipsis;font-size:13px;font-weight:600;overflow:hidden}.sidebar-user-role{color:var(--color-text-muted);font-size:11px}.avatar{color:#fff;border-radius:10px;flex-shrink:0;justify-content:center;align-items:center;width:34px;height:34px;font-size:14px;font-weight:700;display:flex}.teacher-avatar{background:linear-gradient(135deg,#6366f1,#8b5cf6)}.student-avatar{background:linear-gradient(135deg,#0ea5e9,#6366f1)}.logout-btn{border-radius:var(--radius-sm);color:var(--color-text-muted);flex-shrink:0;justify-content:center;align-items:center;padding:8px;transition:all 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var(--color-border);border-radius:var(--radius);flex-direction:column;gap:16px;padding:24px;display:flex}.waiting-note{color:var(--color-text-muted);font-size:13px;line-height:1.6}.session-list{flex-direction:column;gap:12px;display:flex}.session-table-wrap{border-radius:var(--radius);border:1px solid var(--color-border);overflow-x:auto}.session-table{border-collapse:collapse;width:100%;font-size:13px}.session-table th{text-align:left;text-transform:uppercase;letter-spacing:.06em;color:var(--color-text-muted);border-bottom:1px solid var(--color-border);background:#ffffff05;padding:11px 16px;font-size:11px;font-weight:600}.session-table td{color:var(--color-text);vertical-align:middle;border-bottom:1px solid #ffffff0a;padding:13px 16px}.session-table tr:last-child td{border-bottom:none}.session-table tbody tr:hover 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