@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap";
:root{--color-bg-primary:#0a0e1a;--color-bg-secondary:#111827;--color-bg-card:#11182799;--color-bg-glass:#ffffff0a;--color-bg-glass-hover:#ffffff14;--color-accent-blue:#3b82f6;--color-accent-blue-light:#60a5fa;--color-accent-purple:#8b5cf6;--color-accent-cyan:#06b6d4;--color-accent-green:#10b981;--color-accent-orange:#f59e0b;--color-accent-pink:#ec4899;--gradient-primary:linear-gradient(135deg, #3b82f6, #8b5cf6);--gradient-warm:linear-gradient(135deg, #f59e0b, #ec4899);--gradient-cool:linear-gradient(135deg, #06b6d4, #3b82f6);--gradient-bg:radial-gradient(ellipse at 20% 50%, #3b82f614 0%, transparent 50%), radial-gradient(ellipse at 80% 20%, #8b5cf60f 0%, transparent 50%), radial-gradient(ellipse at 50% 80%, #06b6d40d 0%, transparent 50%);--color-text-primary:#f1f5f9;--color-text-secondary:#94a3b8;--color-text-muted:#64748b;--color-border:#ffffff14;--color-border-hover:#ffffff26;--shadow-sm:0 1px 2px #0000004d;--shadow-md:0 4px 12px #0006;--shadow-lg:0 8px 32px #00000080;--shadow-glow-blue:0 0 20px #3b82f64d;--shadow-glow-purple:0 0 20px #8b5cf64d;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:24px;--transition-fast:.15s cubic-bezier(.4, 0, .2, 1);--transition-normal:.25s cubic-bezier(.4, 0, .2, 1);--transition-slow:.4s cubic-bezier(.4, 0, .2, 1);--font-sans:"Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;height:100%}body{min-height:100vh;font-family:var(--font-sans);background-color:var(--color-bg-primary);color:var(--color-text-primary);line-height:1.6}.page-bg{z-index:0;background:var(--gradient-bg);pointer-events:none;position:fixed;inset:0}.page-bg:before{content:"";background:repeating-conic-gradient(#ffffff03 0%,#0000 2%);width:200%;height:200%;animation:120s linear infinite bgRotate;position:absolute;top:-50%;left:-50%}@keyframes bgRotate{to{transform:rotate(360deg)}}.container{z-index:1;flex-direction:column;justify-content:center;max-width:520px;min-height:100vh;margin:0 auto;padding:40px 24px;display:flex;position:relative}.header{text-align:center;margin-bottom:40px}.logo-icon{border-radius:var(--radius-lg);background:var(--gradient-primary);width:64px;height:64px;box-shadow:var(--shadow-glow-blue);justify-content:center;align-items:center;margin-bottom:20px;animation:3s ease-in-out infinite logoPulse;display:inline-flex}@keyframes logoPulse{0%,to{box-shadow:var(--shadow-glow-blue);transform:scale(1)}50%{transform:scale(1.03);box-shadow:0 0 30px #3b82f680}}.logo-icon svg{color:#fff;width:32px;height:32px}.header h1{letter-spacing:-.5px;background:var(--gradient-primary);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;margin-bottom:8px;font-size:28px;font-weight:700}.header p{color:var(--color-text-secondary);font-size:15px}.card{background:var(--color-bg-card);-webkit-backdrop-filter:blur(20px);border:1px solid var(--color-border);border-radius:var(--radius-xl);box-shadow:var(--shadow-lg);transition:border-color var(--transition-normal);padding:32px}.card:hover{border-color:var(--color-border-hover)}.tabs{background:var(--color-bg-glass);border-radius:var(--radius-md);gap:4px;margin-bottom:28px;padding:4px;display:flex}.tab-btn{border-radius:var(--radius-sm);color:var(--color-text-secondary);font-family:var(--font-sans);cursor:pointer;transition:all var(--transition-fast);background:0 0;border:none;flex:1;padding:10px 16px;font-size:14px;font-weight:500;position:relative;overflow:hidden}.tab-btn:before{content:"";opacity:0;background:var(--gradient-primary);transition:opacity var(--transition-fast);border-radius:inherit;position:absolute;inset:0}.tab-btn:hover{color:var(--color-text-primary)}.tab-btn.active{color:#fff;font-weight:600}.tab-btn.active:before{opacity:1}.tab-btn span{z-index:1;justify-content:center;align-items:center;gap:6px;display:flex;position:relative}.form-group{margin-bottom:20px}.form-label{color:var(--color-text-secondary);letter-spacing:.3px;margin-bottom:8px;font-size:13px;font-weight:500;display:block}.form-input{border:1px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-bg-glass);width:100%;color:var(--color-text-primary);font-family:var(--font-sans);transition:all var(--transition-fast);outline:none;padding:12px 16px;font-size:14px}.form-input::placeholder{color:var(--color-text-muted)}.form-input:focus{border-color:var(--color-accent-blue);background:#ffffff0f;box-shadow:0 0 0 3px #3b82f626}.form-select{border:1px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-bg-glass);width:100%;color:var(--color-text-primary);font-family:var(--font-sans);transition:all var(--transition-fast);cursor:pointer;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");background-position:right 14px center;background-repeat:no-repeat;outline:none;padding:12px 16px;font-size:14px}.form-select option{background:var(--color-bg-secondary);color:var(--color-text-primary)}.form-select:focus{border-color:var(--color-accent-blue);box-shadow:0 0 0 3px #3b82f626}.btn{border-radius:var(--radius-md);width:100%;font-family:var(--font-sans);cursor:pointer;transition:all var(--transition-fast);border:none;padding:14px 24px;font-size:15px;font-weight:600;position:relative;overflow:hidden}.btn-primary{background:var(--gradient-primary);color:#fff;box-shadow:var(--shadow-glow-blue)}.btn-primary:hover{transform:translateY(-1px);box-shadow:0 0 30px #3b82f666}.btn-primary:active{transform:translateY(0)}.btn-primary:disabled{opacity:.5;cursor:not-allowed;box-shadow:none;transform:none}.btn-secondary{background:var(--gradient-warm);color:#fff;box-shadow:0 0 20px #f59e0b33}.btn-secondary:hover{transform:translateY(-1px);box-shadow:0 0 30px #f59e0b4d}.btn-secondary:active{transform:translateY(0)}.btn-secondary:disabled{opacity:.5;cursor:not-allowed;box-shadow:none;transform:none}.btn .spinner{vertical-align:middle;border:2px solid #ffffff4d;border-top-color:#fff;border-radius:50%;width:18px;height:18px;margin-right:8px;animation:.6s linear infinite spin;display:inline-block}@keyframes spin{to{transform:rotate(360deg)}}.room-badge{border-radius:var(--radius-md);background:#3b82f61a;border:1px solid #3b82f633;align-items:center;gap:10px;margin-top:16px;padding:12px 16px;display:flex}.room-badge-label{color:var(--color-accent-blue-light);white-space:nowrap;font-size:12px;font-weight:500}.room-badge-id{color:var(--color-text-primary);text-overflow:ellipsis;flex:1;font-family:SF Mono,Fira Code,monospace;font-size:13px;overflow:hidden}.room-badge button{color:var(--color-accent-blue-light);font-size:12px;font-family:var(--font-sans);cursor:pointer;transition:all var(--transition-fast);white-space:nowrap;background:0 0;border:1px solid #3b82f64d;border-radius:6px;padding:4px 10px}.room-badge button:hover{background:#3b82f626}.features{grid-template-columns:repeat(3,1fr);gap:12px;margin-top:32px;display:grid}.feature{text-align:center;background:var(--color-bg-glass);border:1px solid var(--color-border);border-radius:var(--radius-md);transition:all var(--transition-normal);padding:16px 8px}.feature:hover{border-color:var(--color-border-hover);background:var(--color-bg-glass-hover);transform:translateY(-2px)}.feature-icon{margin-bottom:6px;font-size:24px}.feature-text{color:var(--color-text-secondary);font-size:12px;font-weight:500}.classroom-container{width:100vw;height:100vh;position:relative;overflow:hidden}.classroom-loading{flex-direction:column;justify-content:center;align-items:center;gap:20px;height:100vh;display:flex}.classroom-loading .loader{border:3px solid var(--color-border);border-top-color:var(--color-accent-blue);border-radius:50%;width:48px;height:48px;animation:.8s linear infinite spin}.classroom-loading p{color:var(--color-text-secondary);font-size:15px}.classroom-error{text-align:center;flex-direction:column;justify-content:center;align-items:center;gap:16px;height:100vh;padding:24px;display:flex}.classroom-error h2{color:var(--color-accent-pink);font-size:20px}.classroom-error p{color:var(--color-text-secondary);max-width:400px;font-size:14px}.classroom-error a{color:var(--color-accent-blue-light);border:1px solid var(--color-accent-blue);border-radius:var(--radius-md);transition:all var(--transition-fast);padding:10px 24px;font-weight:500;text-decoration:none}.classroom-error a:hover{background:#3b82f61a}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.animate-in{animation:slideUp .5s var(--transition-normal) forwards}.animate-in-delay-1{opacity:0;animation-delay:.1s}.animate-in-delay-2{opacity:0;animation-delay:.2s}.animate-in-delay-3{opacity:0;animation-delay:.3s}.footer{text-align:center;color:var(--color-text-muted);margin-top:32px;padding:16px;font-size:12px}.footer a{color:var(--color-accent-blue-light);transition:color var(--transition-fast);text-decoration:none}.footer a:hover{color:var(--color-accent-blue)}@media (max-width:580px){.container{padding:24px 16px}.card{padding:24px 20px}.header h1{font-size:24px}.features{grid-template-columns:repeat(3,1fr);gap:8px}.room-id-value{letter-spacing:3px!important;font-size:28px!important}}.room-created-header{text-align:center;margin-bottom:24px}.room-created-icon{margin-bottom:8px;font-size:40px;animation:.4s cubic-bezier(.34,1.56,.64,1) forwards popIn}@keyframes popIn{0%{opacity:0;transform:scale(0)}to{opacity:1;transform:scale(1)}}.room-created-title{color:var(--color-text-primary);margin-bottom:4px;font-size:22px;font-weight:700}.room-created-subtitle{color:var(--color-text-secondary);font-size:14px}.room-id-display{text-align:center;border-radius:var(--radius-lg);background:#3b82f614;border:1px solid #3b82f633;margin-bottom:20px;padding:24px 20px}.room-id-label{color:var(--color-accent-blue-light);text-transform:uppercase;letter-spacing:1.5px;margin-bottom:10px;font-size:12px;font-weight:500}.room-id-value{color:var(--color-text-primary);letter-spacing:5px;word-break:break-all;-webkit-user-select:all;user-select:all;margin-bottom:14px;font-family:SF Mono,Fira Code,Cascadia Code,monospace;font-size:36px;font-weight:800;line-height:1.3}.room-id-copy{color:var(--color-accent-blue-light);font-size:13px;font-family:var(--font-sans);cursor:pointer;transition:all var(--transition-fast);background:#3b82f61a;border:1px solid #3b82f666;border-radius:8px;padding:6px 20px;font-weight:500}.room-id-copy:hover{border-color:var(--color-accent-blue);background:#3b82f633}.share-section{margin-bottom:20px}.share-link-box{gap:8px;display:flex}.share-link-input{cursor:text;text-overflow:ellipsis;white-space:nowrap;flex:1;overflow:hidden;color:var(--color-text-secondary)!important;font-size:12px!important}.share-link-btn{border:1px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-bg-glass);color:var(--color-accent-blue-light);font-size:13px;font-family:var(--font-sans);cursor:pointer;transition:all var(--transition-fast);white-space:nowrap;padding:12px 18px;font-weight:500}.share-link-btn:hover{background:var(--color-bg-glass-hover);border-color:var(--color-border-hover)}.room-meta{gap:12px;display:flex}.room-meta-item{background:var(--color-bg-glass);border:1px solid var(--color-border);border-radius:var(--radius-md);flex-direction:column;flex:1;gap:4px;padding:12px 14px;display:flex}.room-meta-label{color:var(--color-text-muted);text-transform:uppercase;letter-spacing:.5px;font-size:11px;font-weight:500}.room-meta-value{color:var(--color-text-primary);font-size:14px;font-weight:600}.btn-link{text-align:center;width:100%;color:var(--color-text-secondary);font-family:var(--font-sans);cursor:pointer;transition:color var(--transition-fast);background:0 0;border:none;padding:8px 16px;font-size:13px;display:block}.btn-link:hover{color:var(--color-text-primary)}.join-hint{border-radius:var(--radius-md);color:var(--color-accent-green);background:#10b9811a;border:1px solid #10b98140;margin-bottom:20px;padding:12px 16px;font-size:14px}.join-hint strong{color:var(--color-text-primary);font-weight:600}