*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}:root{--bg: #0f172a;--bg-card: #1e293b;--bg-card-hover: #334155;--text: #e2e8f0;--text-muted: #94a3b8;--primary: #3b82f6;--primary-hover: #2563eb;--secondary: #475569;--secondary-hover: #64748b;--accent: #10b981;--accent-soft: rgba(16, 185, 129, .15);--warning: #f59e0b;--border: #334155;--radius: 12px;--shadow: 0 4px 24px rgba(0, 0, 0, .3)}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans SC,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh}.container{max-width:900px;margin:0 auto;padding:0 20px}.header{padding:40px 0 20px;text-align:center;background:linear-gradient(135deg,#1e293b,#0f172a);border-bottom:1px solid var(--border)}.header h1{font-size:2rem;font-weight:700;display:flex;align-items:center;justify-content:center;gap:12px}.header .icon{font-size:2rem}.subtitle{color:var(--text-muted);margin-top:8px;font-size:.95rem}.card{background:var(--bg-card);border-radius:var(--radius);padding:28px;margin-top:24px;box-shadow:var(--shadow);border:1px solid var(--border)}.card-title{font-size:1.1rem;font-weight:600;margin-bottom:18px;padding-bottom:12px;border-bottom:1px solid var(--border);color:var(--primary)}.input-label{display:block;margin-bottom:8px;font-weight:500;color:var(--text-muted);font-size:.9rem}.input-row{display:flex;gap:10px}.input{flex:1;padding:12px 16px;border:2px solid var(--border);border-radius:8px;background:#0f172a;color:var(--text);font-size:1.05rem;font-family:SF Mono,Fira Code,Cascadia Code,monospace;outline:none;transition:border-color .2s}.input:focus{border-color:var(--primary)}.input::placeholder{color:var(--text-muted);opacity:.6}.btn{padding:12px 22px;border:none;border-radius:8px;font-size:.95rem;font-weight:600;cursor:pointer;transition:all 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Code,monospace;color:var(--text);word-break:break-all}.result-value.highlight code{color:var(--accent);font-weight:700;font-size:1.1rem}.btn-copy{background:none;border:none;cursor:pointer;font-size:1rem;padding:4px 6px;border-radius:4px;transition:background .2s;opacity:.6}.btn-copy:hover{background:var(--bg-card-hover);opacity:1}.network-grid{display:flex;flex-direction:column;gap:10px}.network-item{display:flex;align-items:center;gap:10px;background:#0f172a;border-radius:8px;padding:12px 16px;border:1px solid var(--border)}.network-item.highlight-box{border-left:3px solid var(--accent)}.network-item.range-box{border-left:3px solid var(--warning)}.network-label{font-size:.82rem;color:var(--text-muted);min-width:80px;flex-shrink:0}.network-value{font-size:1rem;font-family:SF Mono,Fira Code,Cascadia Code,monospace;color:var(--text);flex:1;word-break:break-all}.cidr-suffix{color:var(--primary);font-weight:600}.btn-copy-sm{background:none;border:none;cursor:pointer;font-size:.9rem;padding:2px 6px;border-radius:4px;transition:background .2s;opacity:.5;flex-shrink:0}.btn-copy-sm:hover{background:var(--bg-card-hover);opacity:1}.network-stats{display:flex;gap:16px;margin-top:4px}.stat{display:flex;align-items:center;gap:6px;background:#0f172a;padding:8px 14px;border-radius:8px;border:1px solid var(--border)}.stat-label{font-size:.82rem;color:var(--text-muted)}.stat-value{font-weight:700;font-size:1.05rem;font-family:monospace;color:var(--primary)}.mask-detail{margin-top:20px;padding-top:18px;border-top:1px solid var(--border)}.detail-title{font-size:.9rem;color:var(--text-muted);margin-bottom:12px}.bit-display{display:flex;flex-direction:column;gap:6px}.bit-row{display:flex;align-items:center;gap:10px}.octet-label{width:48px;font-size:.78rem;color:var(--text-muted);text-align:right;flex-shrink:0}.octet-bits{display:flex;gap:3px}.bit{display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:4px;font-size:.75rem;font-family:SF Mono,Fira Code,monospace;font-weight:600;transition:all .2s}.bit-1{background:#3b82f64d;color:#60a5fa}.bit-0{background:#47556966;color:#64748b}.octet-decimal{width:36px;font-size:.82rem;font-family:monospace;color:var(--text-muted);text-align:right;flex-shrink:0}.bit-summary{display:flex;gap:16px;margin-top:14px;padding:12px 16px;background:#0f172a;border-radius:8px}.summary-item{display:flex;align-items:center;gap:6px}.summary-label{font-size:.82rem;color:var(--text-muted)}.summary-value{font-weight:700;font-size:1.1rem;font-family:monospace}.network-bits{color:#60a5fa}.host-bits{color:var(--accent)}.host-count{color:var(--warning)}.summary-unit{font-size:.78rem;color:var(--text-muted)}.table-wrapper{overflow-x:auto}.lookup-table{width:100%;border-collapse:collapse;font-size:.88rem}.lookup-table th{text-align:left;padding:10px 12px;background:#0f172a;color:var(--text-muted);font-weight:600;font-size:.82rem;text-transform:uppercase;letter-spacing:.03em;border-bottom:2px solid var(--border)}.lookup-table td{padding:9px 12px;border-bottom:1px solid var(--border);font-family:SF Mono,Fira Code,monospace;cursor:pointer;transition:background .15s}.lookup-table td code{font-family:inherit;color:var(--text)}.lookup-table tr:hover td{background:var(--bg-card-hover)}.lookup-table tr.active td{background:#3b82f626}.lookup-table tr.active td:first-child{border-left:3px solid var(--primary)}.toast{position:fixed;bottom:30px;left:50%;transform:translate(-50%);padding:12px 24px;background:var(--bg-card);border:1px solid var(--border);border-radius:8px;box-shadow:0 8px 32px #00000080;color:var(--text);font-size:.9rem;z-index:1000;pointer-events:none}.toast-enter-active,.toast-leave-active{transition:all .3s ease}.toast-enter-from,.toast-leave-to{opacity:0;transform:translate(-50%) translateY(20px)}.footer{text-align:center;padding:30px 0;margin-top:20px;color:var(--text-muted);font-size:.82rem;border-top:1px solid var(--border)}@media(max-width:600px){.header h1{font-size:1.5rem}.input-row{flex-wrap:wrap}.input-row .input{flex:1 1 100%}.input-row .btn{flex:1}.result-grid{grid-template-columns:1fr}.bit{width:22px;height:22px;font-size:.65rem}.octet-label{width:36px;font-size:.7rem}.card{padding:18px}}