@import url("https://fonts.googleapis.com/css2?family=Montserrat:wght@400;500;600;700&display=swap");*,:after,:before{box-sizing:border-box;margin:0;padding:0}:root{--bg:#0a0f1e;--surface:#111827;--surface2:#1e2a3a;--teal:#2dd4bf;--blue:#60b4f0;--text:#f0f4ff;--muted:#94a3b8;--border:#2a3a4e;--danger:#f87171;--icon-color:#fff;--radius:10px;--nav-h:64px;--top-h:54px;--font:"Montserrat",ui-sans-serif,system-ui,sans-serif;--font-heading:"Montserrat",ui-sans-serif,system-ui,sans-serif}.greeting-name,.login-logo,.section-title,.topbar-brand,h1,h2,h3,h4,h5,h6{font-family:var(--font-heading);font-weight:700}#root,body,html{height:100%}body{font-family:var(--font);font-size:15px;line-height:1.5;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;overscroll-behavior:none}:focus-visible{outline:2px solid var(--teal);outline-offset:2px}i.fa-brands,i.fa-regular,i.fa-solid,i[class*=fa-]{color:var(--icon-color)}.side-brand{display:none}.shell{margin:0 auto;height:100dvh;display:flex;flex-direction:column;background:var(--bg);overflow:hidden}.topbar{height:var(--top-h);display:flex;align-items:center;justify-content:space-between;padding:0 16px;background:var(--surface);flex-shrink:0;z-index:10}.topbar-brand{font-size:18px;font-weight:700;color:var(--text);letter-spacing:-.01em;text-decoration:none;display:inline-block}.topbar-brand span{color:var(--teal)}.topbar-logo{height:32px;max-width:170px;object-fit:contain;display:block}.topbar-left{gap:10px;min-width:0}.topbar-left,.topbar-right{display:flex;align-items:center}.topbar-right{gap:8px}.icon-btn{width:36px;height:36px;border-radius:var(--radius);background:var(--surface2);border:1px solid var(--border);color:var(--text);display:flex;align-items:center;justify-content:center;font-size:16px;cursor:pointer;transition:border-color .15s}.icon-btn:hover{border-color:var(--teal)}.avatar{width:34px;height:34px;border-radius:50%;background:var(--teal);color:var(--bg);display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:600;border:none;cursor:pointer;flex-shrink:0;text-decoration:none;padding:0;font-family:var(--font)}.scroll-area{flex:1 1;overflow-y:auto;-webkit-overflow-scrolling:touch;padding-bottom:16px}.scroll-area::-webkit-scrollbar{display:none}.bottom-nav{height:var(--nav-h);display:flex;background:var(--surface);flex-shrink:0;padding-bottom:env(safe-area-inset-bottom)}.nav-tab{flex:1 1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;cursor:pointer;color:var(--muted);border:none;background:transparent;-webkit-tap-highlight-color:transparent;position:relative;font-family:var(--font);transition:color .15s;padding:0;text-decoration:none}.nav-tab:hover{color:var(--text)}.nav-tab.active{color:#fff;background:var(--teal)}.nav-icon{font-size:18px;line-height:1}.nav-tab.active .nav-icon i{color:#fff}.nav-label{font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.06em}.section-header{display:flex;justify-content:space-between;align-items:center;padding:20px 16px 10px}.section-title{font-size:20px;font-weight:700;color:var(--text)}.account-type-row{display:flex;align-items:baseline;justify-content:space-between;gap:12px}.account-type-value{font-size:14px;font-weight:500;color:var(--text)}.section-subtitle{font-size:12px;font-weight:500;color:var(--muted);text-transform:uppercase;letter-spacing:.06em;margin-top:2px}.section-link{font-size:13px;font-weight:500;color:var(--teal);cursor:pointer;background:none;border:none;font-family:var(--font)}.section-link:hover{text-decoration:underline}.greeting-card{margin:14px 16px 6px;padding:18px;background:var(--surface2);border-radius:var(--radius);border:1px solid var(--border);border-left:3px solid var(--teal)}.greeting-label{font-size:11px;font-weight:500;color:var(--muted);text-transform:uppercase;letter-spacing:.08em;margin-bottom:4px}.greeting-name{font-size:22px;font-weight:700;color:var(--text);margin-bottom:4px}.greeting-name span{color:var(--teal)}.greeting-meta{font-size:13px;color:var(--muted)}.stats-row{display:flex;gap:8px;padding:8px 16px 4px;overflow-x:auto}.stats-row::-webkit-scrollbar{display:none}.stat-pill{flex-shrink:0;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:10px 14px;min-width:80px}.stat-num{font-size:22px;font-weight:600;color:var(--text);line-height:1}.stat-lbl{font-size:11px;font-weight:500;color:var(--muted);text-transform:uppercase;letter-spacing:.06em;margin-top:3px}.resource-list{display:flex;flex-direction:column;gap:8px;padding:0 16px}.resource-date-heading{font-size:12px;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:.06em;padding:16px 16px 6px}.res-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);display:flex;align-items:center;gap:12px;padding:12px;cursor:pointer;transition:border-color .15s;-webkit-tap-highlight-color:transparent}.res-card:hover{border-color:var(--teal)}.res-card:active{opacity:.85}.res-icon{width:44px;height:44px;border-radius:8px;background:var(--surface2);border:1px solid var(--border);display:flex;align-items:center;justify-content:center;font-size:20px;flex-shrink:0}.res-icon.notation{border-color:var(--blue);color:var(--blue)}.res-icon.audio{border-color:var(--teal);color:var(--teal)}.res-icon.mixed{border-color:var(--blue);color:var(--blue)}.res-info{flex:1 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var(--border);border-radius:6px;cursor:pointer;color:var(--muted);flex-shrink:0;font-family:var(--font);transition:border-color .15s,color .15s}.upload-chip:hover{border-color:var(--teal);color:var(--teal)}.group-qr-hero{display:flex;justify-content:center;padding:8px 16px 16px}.group-qr-hero-img{width:100%;max-width:320px;aspect-ratio:1;border-radius:12px;background:#fff;padding:12px;object-fit:contain}.group-invite{display:flex;flex-direction:column;gap:8px;padding:0 16px}.group-invite-row{display:flex;gap:8px;align-items:center}.group-invite-row .form-input{flex:1 1;font-size:12px;min-width:0}.group-invite-hint{font-size:11px;color:var(--muted)}.student-actions{display:flex;flex-direction:column;gap:6px;align-items:flex-end;flex-shrink:0}.tutor-select{font-size:11px;font-weight:500;padding:5px 8px;border:1px solid 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var(--teal);border-radius:8px;font-size:13px;color:var(--muted)}.scroll-area>.info-box{margin-left:16px;margin-right:16px}.primary-btn{width:100%;padding:13px;background:var(--teal);color:var(--bg);border:none;border-radius:var(--radius);font-family:var(--font);font-size:13px;font-weight:600;text-transform:uppercase;letter-spacing:.08em;cursor:pointer;transition:opacity .15s}.primary-btn:hover{opacity:.9}.primary-btn:active{opacity:.8}.danger-btn{width:100%;padding:13px;background:var(--danger);color:var(--bg);border:none;border-radius:var(--radius);font-family:var(--font);font-size:13px;font-weight:600;text-transform:uppercase;letter-spacing:.08em;cursor:pointer;transition:opacity 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.15s}.p-btn:hover{color:var(--text)}.p-play{width:30px;height:30px;border-radius:50%;background:var(--teal);border:none;color:var(--bg);font-size:12px;display:flex;align-items:center;justify-content:center;cursor:pointer;font-family:var(--font)}.chips{display:flex;gap:6px;padding:4px 16px;overflow-x:auto}.chips::-webkit-scrollbar{display:none}.chip{flex-shrink:0;padding:5px 12px;border-radius:20px;font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.06em;border:1px solid var(--border);background:var(--surface);cursor:pointer;color:var(--muted);font-family:var(--font);transition:all .15s}.chip.active{background:var(--surface2);color:var(--teal);border-color:var(--teal)}.chip:hover:not(.active){border-color:var(--muted);color:var(--text)}.pwa-prompt{position:fixed;left:50%;transform:translateX(-50%);bottom:calc(var(--nav-h) + 12px);width:min(420px,calc(100vw - 24px));z-index:60;background:var(--surface2);border:1px solid var(--teal);border-radius:var(--radius);padding:14px 16px;display:flex;flex-direction:column;gap:12px;box-shadow:0 8px 28px rgba(0,0,0,.45)}.pwa-prompt-body{display:flex;align-items:center;gap:12px}.pwa-prompt-icon{width:40px;height:40px;flex-shrink:0;border-radius:10px;background:var(--teal);display:flex;align-items:center;justify-content:center;font-size:18px}.pwa-prompt-text{min-width:0}.pwa-prompt-title{font-size:14px;font-weight:600;color:var(--text)}.pwa-prompt-sub{font-size:12px;color:var(--muted);margin-top:2px}.pwa-prompt-actions{display:flex;gap:8px;justify-content:flex-end}.pwa-install-btn{padding:8px 16px;border:none;border-radius:8px;background:var(--teal);color:var(--bg);font-weight:600}.pwa-dismiss-btn,.pwa-install-btn{font-family:var(--font);font-size:13px;cursor:pointer}.pwa-dismiss-btn{padding:8px 14px;border:1px solid var(--border);border-radius:8px;background:transparent;color:var(--muted);font-weight:500;transition:color .15s,border-color .15s}.pwa-dismiss-btn:hover{color:var(--text);border-color:var(--muted)}@media (min-width:768px){.pwa-prompt{left:auto;right:20px;transform:none;bottom:20px}}.chip-grid{display:flex;flex-wrap:wrap;gap:8px}.chip-grid .chip{flex-shrink:0}.avatar,.avatar-edit-preview,.avatar-pick,.profile-av,.student-av{overflow:hidden}.avatar img,.avatar-edit-preview img,.avatar-pick img,.profile-av img,.student-av img{width:100%;height:100%;object-fit:cover;display:block}.profile-bio{font-size:13px;color:var(--muted);margin-top:6px;line-height:1.5}.avatar-edit{display:flex;align-items:center;gap:14px}.avatar-edit-preview{width:72px;height:72px;border-radius:50%;background:var(--teal);color:var(--bg);display:flex;align-items:center;justify-content:center;font-size:24px;font-weight:600;flex-shrink:0;border:1px solid var(--border)}.avatar-edit-controls{display:flex;flex-direction:column;gap:8px;align-items:flex-start}.brand-logo-preview{width:104px;height:56px;border-radius:8px;background:var(--surface2);border:1px solid var(--border);display:flex;align-items:center;justify-content:center;font-size:11px;color:var(--muted);overflow:hidden;flex-shrink:0}.brand-logo-preview img{max-width:100%;max-height:100%;object-fit:contain}.avatar-options{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}.avatar-pick{width:46px;height:46px;border-radius:50%;border:2px solid transparent;background:none;cursor:pointer;padding:0;transition:border-color .15s}.avatar-pick.active{border-color:var(--teal)}.avatar-pick:hover:not(.active){border-color:var(--muted)}.avatar-menu{position:relative;display:inline-flex}.avatar-dropdown{position:absolute;top:calc(100% + 8px);right:0;min-width:168px;background:var(--surface2);border:1px solid 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1;font-size:14px;font-weight:400;color:var(--text)}.menu-arrow{color:var(--muted);font-size:14px}.menu-item.danger .menu-label{color:var(--text)}.menu-item.danger .menu-icon{color:var(--danger)}.menu-item.danger:hover{border-color:var(--danger)}.login-wrap{min-height:100dvh;display:flex;align-items:center;justify-content:center;background:var(--bg);padding:24px}.login-card{background:var(--surface);border-radius:14px;padding:32px 24px;width:100%;max-width:360px;border:1px solid var(--border);border-top:3px solid var(--teal)}.login-logo{font-size:22px;font-weight:700;color:var(--text);margin-bottom:4px}.login-logo span{color:var(--teal)}.login-tagline{font-size:12px;font-weight:500;color:var(--muted);text-transform:uppercase;letter-spacing:.08em;margin-bottom:24px}.tab-bar{display:flex;background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:3px;gap:2px;margin-bottom:20px}.tab-btn{flex:1 1;padding:8px;border:none;background:transparent;font-family:var(--font);font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);cursor:pointer;border-radius:6px;transition:all .15s}.tab-btn.active{background:var(--surface2);color:var(--teal);border:1px solid var(--border)}.form-group{margin-bottom:12px}.login-hint{text-align:center;font-size:11px;color:var(--muted);margin-top:12px;line-height:1.7}@media (min-width:768px){:root{--side-w:232px;--shell-max:1200px}.shell{max-width:none;height:100dvh;display:grid;grid-template-columns:var(--side-w) 1fr;grid-template-rows:var(--top-h) 1fr;grid-template-areas:"nav top" "nav main"}.topbar{grid-area:top}.scroll-area{grid-area:main;padding:0 8px 24px}.bottom-nav{grid-area:nav;height:auto;flex-direction:column;justify-content:flex-start;align-items:stretch;gap:4px;padding:12px 12px 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.15s}.nav-tab:hover{background:var(--surface2);color:var(--text)}.nav-tab.active{background:var(--teal);color:#fff}.nav-icon{font-size:16px;width:20px;text-align:center}.nav-label{font-size:13px;font-weight:500;text-transform:none;letter-spacing:0}.resource-list,.student-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));grid-gap:10px;gap:10px}.menu-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}.info-box,.mini-player,.upload-form{max-width:640px}}.modal-overlay{position:fixed;inset:0;z-index:1000;background:rgba(5,8,16,.62);display:flex;align-items:center;justify-content:center;padding:20px}.modal-card{width:100%;max-width:400px;max-height:calc(100vh - 40px);overflow-y:auto;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px 18px 16px;box-shadow:0 16px 48px rgba(0,0,0,.5)}.modal-title{font-family:var(--font-heading,var(--font));font-weight:700;font-size:18px;color:var(--text);margin-bottom:12px}.modal-desc{font-size:13px;color:var(--muted);margin-bottom:14px;line-height:1.5}.modal-actions{display:flex;align-items:center;justify-content:flex-end;gap:12px;margin-top:6px}.modal-btn{width:auto;padding:11px 20px}