:root{--brand-500: #7c3aed;--brand-600: #6d28d9;--brand-700: #5b21b6;--brand-400: #a855f7;--brand-grad: linear-gradient(135deg, #7c3aed 0%, #6366f1 55%, #4f46e5 100%);--brand-grad-soft: linear-gradient(135deg, rgba(124, 58, 237, .12), rgba(99, 102, 241, .12));--bg: #f4f5fb;--bg-elevated: #ffffff;--sidebar-bg: #0f1024;--sidebar-bg-2: #171935;--sidebar-border: rgba(255, 255, 255, .07);--text: #0f172a;--text-muted: #64748b;--text-faint: #94a3b8;--text-on-dark: rgba(255, 255, 255, .92);--text-on-dark-muted: rgba(255, 255, 255, .55);--border: #e6e8f0;--ring: rgba(124, 58, 237, .35);--shadow-sm: 0 1px 2px rgba(15, 23, 42, .06), 0 1px 3px rgba(15, 23, 42, .05);--shadow-md: 0 6px 18px rgba(15, 23, 42, .08);--shadow-lg: 0 18px 45px rgba(15, 23, 42, .16);--sidebar-w: 264px;--sidebar-w-collapsed: 76px;--header-h: 64px;--radius: 14px;--radius-sm: 10px;--ease: cubic-bezier(.4, 0, .2, 1)}*,*:before,*:after{box-sizing:border-box}body{-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;-webkit-touch-callout:none}input,textarea,[contenteditable=true]{-webkit-user-select:text;-moz-user-select:text;-ms-user-select:text;user-select:text}@media print{html,body{display:none!important}}html,body,#root{height:100%}body{margin:0;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background-color:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;line-height:1.5}h1,h2,h3,h4,h5,h6{line-height:1.2;letter-spacing:-.01em}button{font-family:inherit}a{color:var(--brand-600);text-decoration:none}:focus-visible{outline:2px solid var(--brand-500);outline-offset:2px}*{scrollbar-width:thin;scrollbar-color:rgba(124,58,237,.35) transparent}*::-webkit-scrollbar{width:10px;height:10px}*::-webkit-scrollbar-thumb{background:rgba(100,116,139,.35);border-radius:999px;border:2px solid transparent;background-clip:content-box}*::-webkit-scrollbar-thumb:hover{background:rgba(100,116,139,.55);background-clip:content-box}@keyframes gb-spin{to{transform:rotate(360deg)}}@keyframes gb-fade-in{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}.gb-shell{min-height:100vh;display:flex;background:var(--bg)}.gb-sidebar{position:fixed;inset:0 auto 0 0;width:var(--sidebar-w);background:linear-gradient(180deg,var(--sidebar-bg) 0%,var(--sidebar-bg-2) 100%);color:var(--text-on-dark);display:flex;flex-direction:column;z-index:60;transition:width .28s var(--ease),transform .28s var(--ease);border-right:1px solid var(--sidebar-border)}.gb-sidebar.collapsed{width:var(--sidebar-w-collapsed)}.gb-sidebar__brand{display:flex;align-items:center;gap:12px;height:var(--header-h);padding:0 18px;flex-shrink:0;border-bottom:1px solid var(--sidebar-border)}.gb-sidebar__logo{width:40px;height:40px;border-radius:12px;display:grid;place-items:center;font-size:1.35rem;background:var(--brand-grad);box-shadow:0 6px 16px #7c3aed73;flex-shrink:0}.gb-sidebar__title{display:flex;flex-direction:column;min-width:0;overflow:hidden;white-space:nowrap}.gb-sidebar__title strong{font-size:1.05rem;font-weight:700;letter-spacing:-.02em}.gb-sidebar__title span{font-size:.72rem;color:var(--text-on-dark-muted)}.gb-sidebar.collapsed .gb-sidebar__title{opacity:0}.gb-nav{flex:1;overflow-y:auto;overflow-x:hidden;padding:14px 12px;display:flex;flex-direction:column;gap:4px}.gb-nav__label{font-size:.68rem;text-transform:uppercase;letter-spacing:.09em;color:var(--text-on-dark-muted);padding:12px 12px 6px;white-space:nowrap}.gb-sidebar.collapsed .gb-nav__label{opacity:0;height:8px;padding:0}.gb-nav__item{display:flex;align-items:center;gap:14px;width:100%;padding:11px 12px;border:none;background:transparent;color:var(--text-on-dark-muted);border-radius:var(--radius-sm);cursor:pointer;font-size:.92rem;font-weight:500;text-align:left;white-space:nowrap;position:relative;transition:background .18s var(--ease),color .18s var(--ease)}.gb-nav__item:hover{background:rgba(255,255,255,.06);color:var(--text-on-dark)}.gb-nav__item.active{background:var(--brand-grad);color:#fff;box-shadow:0 8px 20px #7c3aed66}.gb-nav__icon{font-size:1.2rem;width:24px;text-align:center;flex-shrink:0;line-height:1}.gb-nav__text{overflow:hidden;text-overflow:ellipsis}.gb-sidebar.collapsed .gb-nav__item{justify-content:center;padding:11px 0}.gb-sidebar.collapsed .gb-nav__text{display:none}.gb-sidebar.collapsed .gb-nav__item:after{content:attr(data-label);position:absolute;left:calc(100% + 12px);top:50%;transform:translateY(-50%) scale(.9);background:#1e293b;color:#fff;padding:6px 10px;border-radius:8px;font-size:.8rem;white-space:nowrap;opacity:0;pointer-events:none;transition:opacity .15s var(--ease),transform .15s var(--ease);box-shadow:var(--shadow-md);z-index:5}.gb-sidebar.collapsed .gb-nav__item:hover:after{opacity:1;transform:translateY(-50%) scale(1)}.gb-sidebar__footer{flex-shrink:0;padding:12px;border-top:1px solid var(--sidebar-border)}.gb-collapse-btn{display:flex;align-items:center;gap:12px;width:100%;padding:10px 12px;border:none;background:rgba(255,255,255,.05);color:var(--text-on-dark-muted);border-radius:var(--radius-sm);cursor:pointer;font-size:.85rem;font-weight:500;transition:background .18s var(--ease),color .18s var(--ease)}.gb-collapse-btn:hover{background:rgba(255,255,255,.1);color:var(--text-on-dark)}.gb-collapse-btn__icon{font-size:1rem;width:24px;text-align:center;flex-shrink:0;transition:transform .28s var(--ease)}.gb-sidebar.collapsed .gb-collapse-btn{justify-content:center}.gb-sidebar.collapsed .gb-collapse-btn__icon{transform:rotate(180deg)}.gb-sidebar.collapsed .gb-collapse-btn__text{display:none}.gb-main{flex:1;min-width:0;margin-left:var(--sidebar-w);display:flex;flex-direction:column;transition:margin-left .28s var(--ease)}.gb-main.collapsed{margin-left:var(--sidebar-w-collapsed)}.gb-topbar{height:var(--header-h);position:sticky;top:0;z-index:40;display:flex;align-items:center;gap:16px;padding:0 22px;background:rgba(255,255,255,.82);backdrop-filter:saturate(180%) blur(12px);-webkit-backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--border)}.gb-topbar__title{font-size:1.12rem;font-weight:700;color:var(--text);margin:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.gb-topbar__spacer{flex:1}.gb-icon-btn{width:42px;height:42px;display:none;place-items:center;border:1px solid var(--border);background:var(--bg-elevated);border-radius:12px;cursor:pointer;font-size:1.25rem;color:var(--text);flex-shrink:0;transition:background .15s var(--ease),border-color .15s var(--ease)}.gb-icon-btn:hover{background:#f1f5f9}.gb-user{display:flex;align-items:center;gap:12px}.gb-user__meta{display:flex;flex-direction:column;align-items:flex-end;line-height:1.2}.gb-user__name{font-size:.88rem;font-weight:600;color:var(--text)}.gb-user__role{font-size:.7rem;color:var(--brand-600);text-transform:capitalize;font-weight:600}.gb-avatar{width:40px;height:40px;border-radius:50%;display:grid;place-items:center;background:var(--brand-grad);color:#fff;font-weight:700;font-size:.95rem;flex-shrink:0;box-shadow:var(--shadow-sm)}.gb-student-input{width:130px;padding:9px 12px;border:1px solid var(--border);border-radius:10px;background:var(--bg-elevated);color:var(--text);font-size:.86rem;transition:border-color .15s var(--ease),box-shadow .15s var(--ease)}.gb-student-input:focus{outline:none;border-color:var(--brand-500);box-shadow:0 0 0 3px var(--ring)}.gb-btn{display:inline-flex;align-items:center;gap:6px;padding:9px 14px;border-radius:10px;border:1px solid var(--border);background:var(--bg-elevated);color:var(--text);font-size:.83rem;font-weight:600;cursor:pointer;transition:background .15s var(--ease),transform .1s var(--ease),box-shadow .15s var(--ease)}.gb-btn:hover{background:#f1f5f9}.gb-btn:active{transform:translateY(1px)}.gb-btn--ghost{background:transparent;color:var(--text-muted)}.gb-btn--danger{background:#fef2f2;border-color:#fecaca;color:#dc2626}.gb-btn--danger:hover{background:#fee2e2}.gb-content{flex:1;padding:24px;animation:gb-fade-in .35s var(--ease)}.gb-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:rgba(15,16,36,.5);-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);z-index:55;opacity:0;pointer-events:none;transition:opacity .28s var(--ease)}.gb-overlay.show{opacity:1;pointer-events:auto}@media (max-width: 1024px){.gb-content{padding:20px}}@media (max-width: 860px){.gb-sidebar{width:var(--sidebar-w);transform:translate(-100%);box-shadow:var(--shadow-lg)}.gb-sidebar.mobile-open{transform:translate(0)}.gb-sidebar.collapsed{width:var(--sidebar-w)}.gb-sidebar.collapsed .gb-sidebar__title{opacity:1}.gb-sidebar.collapsed .gb-nav__item{justify-content:flex-start;padding:11px 12px}.gb-sidebar.collapsed .gb-nav__text{display:block}.gb-sidebar.collapsed .gb-nav__label{opacity:1;height:auto;padding:12px 12px 6px}.gb-main{margin-left:0!important}.gb-icon-btn{display:grid}.gb-sidebar__footer{display:none}}@media (max-width: 560px){.gb-content{padding:14px}.gb-topbar{padding:0 14px;gap:10px}.gb-user__meta{display:none}.gb-topbar__title{font-size:1rem}.gb-student-input{width:96px}.gb-btn{padding:8px 10px;font-size:.78rem}}