:root{--primary:#6366f1;--primary-hover:#4f46e5;--primary-light:rgba(99,102,241,.1);--primary-glow:rgba(99,102,241,.4);--success:#10b981;--success-light:rgba(16,185,129,.1);--success-glow:rgba(16,185,129,.4);--error:#ef4444;--error-light:rgba(239,68,68,.1);--warning:#f59e0b;--bg-gradient-start:#0f172a;--bg-gradient-end:#1e1b4b;--bg-card:rgba(30,41,59,.8);--bg-card-hover:rgba(30,41,59,.95);--bg-input:rgba(15,23,42,.6);--border:rgba(148,163,184,.1);--border-focus:rgba(99,102,241,.5);--text:#f8fafc;--text-secondary:#cbd5e1;--text-muted:#64748b;--font-family:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;--container-max:1200px;--section-padding:2rem;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:24px;--shadow-sm:0 2px 8px rgba(0,0,0,.1);--shadow-md:0 4px 20px rgba(0,0,0,.15);--shadow-lg:0 8px 40px rgba(0,0,0,.2);--shadow-glow:0 0 30px var(--primary-glow);--transition-fast:0.15s ease;--transition-normal:0.3s ease;--transition-slow:0.5s ease}*,:after,:before{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;scroll-behavior:smooth}body{font-family:var(--font-family);background:linear-gradient(135deg,var(--bg-gradient-start) 0,var(--bg-gradient-end) 100%);color:var(--text);min-height:100vh;line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.app{min-height:100vh}.app,.header{display:flex;flex-direction:column}.header{padding:1rem 2rem;justify-content:center;align-items:center;gap:1rem;border-bottom:1px solid var(--border);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);position:-webkit-sticky;position:sticky;top:0;z-index:100;background:rgba(15,23,42,.8)}@media (min-width:1024px){.header{flex-direction:row;justify-content:space-between}}.logo{display:flex;align-items:center;gap:1rem;text-decoration:none;color:var(--text);flex-shrink:0;animation:logoEntrance .8s cubic-bezier(.2,.8,.2,1) forwards}@keyframes logoEntrance{0%{opacity:0;transform:translateX(-20px)}to{opacity:1;transform:translateX(0)}}.logo-icon{width:48px;height:48px;background:linear-gradient(135deg,#6366f1,#8b5cf6);border-radius:12px;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 15px rgba(99,102,241,.3);position:relative;overflow:hidden;animation:glowPulse 3s infinite}@keyframes glowPulse{0%{box-shadow:0 0 0 0 rgba(99,102,241,.4)}70%{box-shadow:0 0 0 10px rgba(99,102,241,0)}to{box-shadow:0 0 0 0 rgba(99,102,241,0)}}.logo-icon svg{width:24px;height:24px;color:#fff;filter:drop-shadow(0 2px 4px rgba(0,0,0,.2))}.logo-text{font-family:Montserrat,sans-serif;font-size:1.5rem;font-weight:800;text-transform:uppercase;letter-spacing:-.02em;background:linear-gradient(90deg,#fff,#94a3b8);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;position:relative}.navbar-menu{display:flex;gap:.5rem;overflow-x:auto;max-width:100%;padding-bottom:4px;scrollbar-width:thin;scrollbar-color:var(--border) transparent}.navbar-menu::-webkit-scrollbar{height:4px}.navbar-menu a{color:var(--text-muted);text-decoration:none;font-size:.9rem;font-weight:500;padding:.5rem .75rem;border-radius:var(--radius-sm);white-space:nowrap;transition:all var(--transition-fast)}.navbar-menu a:hover{color:var(--primary);background:var(--primary-light)}.navbar-menu a.active{color:var(--text);background:var(--bg-card);border:1px solid var(--border)}.main-content{flex:1 1;padding:2rem;max-width:var(--container-max);margin:0 auto;width:100%}.hero{text-align:center;padding:2rem 0 3rem}.hero-title{font-size:clamp(2rem,5vw,3rem);font-weight:800;margin-bottom:1rem;background:linear-gradient(135deg,var(--text) 0,var(--text-secondary) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero-subtitle{font-size:clamp(1rem,2.5vw,1.25rem);color:var(--text-muted);max-width:600px;margin:0 auto}.sections-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,450px),1fr));grid-gap:2rem;gap:2rem;margin-top:2rem}.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-xl);padding:var(--section-padding);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);transition:all var(--transition-normal);position:relative;overflow:hidden}.card:before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--primary) 0,#8b5cf6 100%);opacity:0;transition:opacity var(--transition-normal)}.card:hover{background:var(--bg-card-hover);border-color:var(--primary);transform:translateY(-4px);box-shadow:var(--shadow-lg),var(--shadow-glow)}.card:hover:before{opacity:1}.card.send-card:before{background:linear-gradient(90deg,var(--primary) 0,#8b5cf6 100%)}.card.retrieve-card:before{background:linear-gradient(90deg,var(--success) 0,#34d399 100%)}.card.retrieve-card:hover{border-color:var(--success);box-shadow:var(--shadow-lg),0 0 30px var(--success-glow)}.card-header{gap:1rem;margin-bottom:1.5rem}.card-header,.card-icon{display:flex;align-items:center}.card-icon{width:48px;height:48px;border-radius:var(--radius-md);justify-content:center;font-size:1.5rem}.send-card .card-icon{background:var(--primary-light);color:var(--primary)}.retrieve-card .card-icon{background:var(--success-light);color:var(--success)}.card-title{font-size:1.25rem;font-weight:700;color:var(--text)}.card-description{font-size:.875rem;color:var(--text-muted)}.form-group{margin-bottom:1.5rem}.textarea{width:100%;min-height:200px;padding:1rem;background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-md);color:var(--text);font-family:var(--font-family);font-size:1rem;resize:vertical;transition:all var(--transition-fast)}.textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-light)}.textarea::placeholder{color:var(--text-muted)}.input{width:100%;padding:1rem 1.25rem;background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-md);color:var(--text);font-family:var(--font-family);font-size:1.25rem;text-align:center;letter-spacing:.5rem;font-weight:600;transition:all var(--transition-fast)}.input:focus{outline:none;border-color:var(--success);box-shadow:0 0 0 3px var(--success-light)}.input::placeholder{color:var(--text-muted);letter-spacing:.1rem}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:1rem 2rem;font-family:var(--font-family);font-size:1rem;font-weight:600;border:none;border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);position:relative;overflow:hidden}.btn:disabled{opacity:.6;cursor:not-allowed}.btn-primary{background:linear-gradient(135deg,var(--primary) 0,#8b5cf6 100%);color:#fff;width:100%}.btn-primary:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 8px 25px var(--primary-glow)}.btn-primary:active:not(:disabled){transform:translateY(0)}.btn-success{background:linear-gradient(135deg,var(--success) 0,#34d399 100%);color:#fff;width:100%}.btn-success:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 8px 25px var(--success-glow)}.btn-success:active:not(:disabled){transform:translateY(0)}.btn-secondary{background:var(--bg-input);color:var(--text);border:1px solid var(--border)}.btn-secondary:hover:not(:disabled){background:var(--bg-card);border-color:var(--primary)}.btn-copy{background:var(--primary-light);color:var(--primary);padding:.75rem 1.25rem;font-size:.875rem}.btn-copy:hover:not(:disabled){background:var(--primary);color:#fff}.spinner{width:20px;height:20px;border:2px solid hsla(0,0%,100%,.3);border-top-color:#fff;border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(1turn)}}.otp-result{margin-top:1.5rem;padding:1.5rem;background:linear-gradient(135deg,var(--primary-light) 0,rgba(139,92,246,.1) 100%);border:1px solid var(--primary);border-radius:var(--radius-lg);text-align:center;animation:slideIn .3s ease}@keyframes slideIn{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.otp-label{font-size:.875rem;color:var(--text-muted);margin-bottom:.5rem}.otp-code{font-size:2.5rem;font-weight:800;letter-spacing:.5rem;color:var(--primary);font-family:Courier New,monospace;margin-bottom:1rem}.otp-actions{display:flex;justify-content:center;gap:.75rem;flex-wrap:wrap}.otp-message{margin-top:1rem;font-size:.875rem;color:var(--text-secondary)}.otp-expiry{display:flex;align-items:center;justify-content:center;gap:.5rem;margin-top:.75rem;font-size:.8rem;color:var(--warning)}.retrieved-text{margin-top:1.5rem;padding:1.5rem;background:linear-gradient(135deg,var(--success-light) 0,rgba(52,211,153,.1) 100%);border:1px solid var(--success);border-radius:var(--radius-lg);animation:slideIn .3s ease}.retrieved-text-label{display:flex;align-items:center;justify-content:space-between;margin-bottom:1rem}.retrieved-text-title{font-size:.875rem;font-weight:600;color:var(--success);display:flex;align-items:center;gap:.5rem}.retrieved-text-content{padding:1rem;background:var(--bg-input);color:var(--text);font-family:Courier New,monospace;white-space:pre-wrap;word-break:break-word;max-height:300px;overflow-y:auto;line-height:1.6}.message,.retrieved-text-content{border-radius:var(--radius-md);font-size:.9rem}.message{padding:1rem 1.25rem;margin-top:1rem;display:flex;align-items:center;gap:.75rem;animation:slideIn .3s ease}.message-success{background:var(--success-light);color:var(--success);border:1px solid var(--success)}.message-error{background:var(--error-light);color:var(--error);border:1px solid var(--error)}.message-icon{font-size:1.25rem;flex-shrink:0}.info-section{max-width:800px;margin:0 auto 3rem;text-align:left;background:var(--bg-card);padding:2rem;border-radius:var(--radius-lg);border:1px solid var(--border);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px)}.info-block{margin-bottom:2rem}.info-block:last-child{margin-bottom:0}.info-block h3{font-family:Montserrat,sans-serif;font-size:1.25rem;font-weight:700;margin-bottom:1rem;color:var(--primary);text-transform:uppercase;letter-spacing:.05em}.info-block p{color:var(--text-secondary);line-height:1.7;font-size:1rem}.info-steps{list-style:none;display:flex;flex-direction:column;gap:1rem}.info-steps li{display:flex;gap:1rem;align-items:flex-start;color:var(--text-secondary);line-height:1.6}.step-number{background:var(--primary-light);color:var(--primary);width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.9rem;font-weight:700;flex-shrink:0;margin-top:-2px}.file-drop-zone{border:2px dashed var(--border);border-radius:var(--radius-md);padding:2rem;text-align:center;cursor:pointer;transition:all .2s;background:hsla(0,0%,100%,.02);display:block}.file-drop-zone:hover{border-color:var(--primary);background:rgba(99,102,241,.05)}.file-placeholder{display:flex;flex-direction:column;align-items:center;gap:.5rem;color:var(--text-muted)}.upload-icon{font-size:2rem;margin-bottom:.5rem}.file-hint{font-size:.8rem;opacity:.6}.file-selected{display:flex;flex-direction:column;align-items:center;gap:.5rem}.file-icon-large{font-size:2.5rem}.file-name{font-weight:500;color:var(--text);word-break:break-all}.file-info-card{background:var(--bg-body);padding:1rem;border-radius:var(--radius-md);display:flex;gap:1rem;align-items:center;border:1px solid var(--border)}.file-details h4{margin:0;font-size:1rem;color:var(--text)}.file-details p{margin:.25rem 0 0;font-size:.85rem;color:var(--text-muted)}.footer{padding:2rem;text-align:center;border-top:1px solid var(--border);color:var(--text-muted);font-size:.875rem}.footer a{color:var(--primary);text-decoration:none;transition:color var(--transition-fast)}.footer a:hover{color:var(--primary-hover)}.toast-container{position:fixed;top:1.5rem;right:1.5rem;z-index:1000;display:flex;flex-direction:column;gap:.75rem}.toast{padding:1rem 1.5rem;border-radius:var(--radius-md);display:flex;align-items:center;gap:.75rem;font-size:.9rem;font-weight:500;box-shadow:var(--shadow-lg);animation:toastIn .3s ease;max-width:350px}@keyframes toastIn{0%{opacity:0;transform:translateX(100%)}to{opacity:1;transform:translateX(0)}}.toast-success{background:var(--success);color:#fff}.toast-error{background:var(--error);color:#fff}.toast-info{background:var(--primary);color:#fff}@media (max-width:768px){.header{padding:1rem 1.5rem}.logo-text{font-size:1.25rem}.main-content{padding:1.5rem 1rem}.hero{padding:1.5rem 0 2rem}.card{padding:1.5rem}.textarea{min-height:150px}.otp-code{font-size:2rem;letter-spacing:.3rem}.btn{padding:.875rem 1.5rem}.toast-container{top:1rem;right:1rem;left:1rem}.toast{max-width:100%}}@media (max-width:480px){html{font-size:14px}.sections-grid{gap:1.5rem}.card-header{flex-direction:column;text-align:center}.otp-code{font-size:1.75rem;letter-spacing:.25rem}.otp-actions{flex-direction:column}.btn-copy{width:100%}}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--bg-input);border-radius:4px}::-webkit-scrollbar-thumb{background:var(--text-muted);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--text-secondary)}::selection{background:var(--primary);color:#fff}:focus-visible{outline:2px solid var(--primary);outline-offset:2px}.realtime-grid{display:grid;grid-template-columns:1fr 280px;grid-gap:2rem;gap:2rem}.realtime-session-card{margin-bottom:2rem;padding:1.5rem}.realtime-session-title{margin:0;font-size:1.5rem;font-weight:800;color:var(--primary)}@media (max-width:768px){.realtime-grid{grid-template-columns:1fr!important;gap:1.5rem}.realtime-session-card{padding:1rem!important;margin-bottom:1rem!important}.realtime-session-title{font-size:1.25rem!important}}