:root{font-family:var(--font-sans);line-height:1.5;font-weight:400;--bg: #0a0a0b;--surface: #141416;--surface-raised: #1c1c1f;--border: #2a2a2e;--text: #e4e4e7;--text-muted: #71717a;--accent: #22d3ee;--accent-hover: #06b6d4;--error: #f87171;--error-bg: rgba(248, 113, 113, .1);--font-mono: "JetBrains Mono", "SF Mono", ui-monospace, monospace;--font-sans: Inter, system-ui, Avenir, Helvetica, Arial, sans-serif;--radius: 6px;color:var(--text);background-color:var(--bg);font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh}#root{width:100%;min-height:100vh}a{color:var(--accent);text-decoration:none}a:hover{color:var(--accent-hover)}.app-container{display:flex;flex-direction:column;min-height:100vh;max-width:960px;margin:0 auto;padding:1.5rem;gap:1.5rem}.app-header{display:flex;align-items:flex-start;justify-content:space-between;gap:1rem;flex-wrap:wrap}.app-header-text{flex:1;min-width:0}.app-title{margin:0;font-family:var(--font-sans);font-size:1.5rem;font-weight:600;letter-spacing:-.02em;color:var(--text)}.app-tagline{margin:.25rem 0 0;font-family:var(--font-mono);font-size:.8rem;color:var(--text-muted)}.github-button{display:inline-flex;align-items:center;gap:.5rem;padding:.5rem .875rem;min-height:44px;font-family:var(--font-mono);font-size:.8rem;color:var(--text-muted);background:transparent;border:1px solid var(--border);border-radius:var(--radius);text-decoration:none;transition:color .15s,border-color .15s,background .15s;flex-shrink:0}.github-button:hover{color:var(--accent);border-color:var(--accent);background:#22d3ee0f}.app-header-nav{display:flex;align-items:center;gap:.5rem;flex-shrink:0}.app-title-link{color:inherit;text-decoration:none}.app-title-link:hover{color:var(--accent)}.nav-link{display:inline-flex;align-items:center;padding:.5rem .875rem;min-height:44px;font-family:var(--font-mono);font-size:.8rem;color:var(--text-muted);background:transparent;border:1px solid var(--border);border-radius:var(--radius);text-decoration:none;transition:color .15s,border-color .15s,background .15s}.nav-link:hover{color:var(--accent);border-color:var(--accent);background:#22d3ee0f}.nav-link.active{color:var(--accent);border-color:var(--accent);background:#22d3ee14}.app-main{display:grid;grid-template-columns:1fr;gap:1.5rem;flex:1}@media (min-width: 768px){.app-main{grid-template-columns:.45fr .55fr;align-items:start}}.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.25rem;display:flex;flex-direction:column;gap:1rem}.panel-title{margin:0;font-family:var(--font-mono);font-size:.7rem;font-weight:500;text-transform:uppercase;letter-spacing:.08em;color:var(--text-muted)}.field{display:flex;flex-direction:column;gap:.375rem}.field-label{font-family:var(--font-mono);font-size:.75rem;color:var(--text-muted)}.field input[type=url],.field select{width:100%;padding:.625rem .75rem;min-height:44px;font-family:var(--font-mono);font-size:.85rem;color:var(--text);background:var(--surface-raised);border:1px solid var(--border);border-radius:var(--radius);transition:border-color .15s,box-shadow .15s}.field input[type=url]::placeholder{color:var(--text-muted);opacity:.7}.field input[type=url]:focus,.field select:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 2px #22d3ee26}.field-row{flex-direction:row;align-items:center;justify-content:space-between;gap:1rem}.field-row select{max-width:6rem;flex-shrink:0}.field-checkbox{flex-direction:row;align-items:center;gap:.5rem}.field-checkbox input[type=checkbox]{width:1rem;height:1rem;margin:0;accent-color:var(--accent);cursor:pointer}.field-checkbox label{font-family:var(--font-mono);font-size:.8rem;color:var(--text);cursor:pointer}.pattern-segmented{display:flex;gap:.5rem}.pattern-btn{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.375rem;min-height:44px;padding:.5rem .25rem;font-family:var(--font-mono);font-size:.7rem;color:var(--text-muted);background:var(--surface-raised);border:1px solid var(--border);border-radius:var(--radius);cursor:pointer;transition:color .15s,border-color .15s,background .15s}.pattern-btn:hover{color:var(--text);border-color:var(--text-muted)}.pattern-btn.active{color:var(--accent);border-color:var(--accent);background:#22d3ee14}.pattern-btn span{line-height:1}.btn-primary,.btn-secondary{width:100%;min-height:44px;padding:.625rem 1rem;font-family:var(--font-mono);font-size:.85rem;font-weight:500;border:none;border-radius:var(--radius);cursor:pointer;transition:background .15s,color .15s,border-color .15s}.btn-primary{color:var(--bg);background:var(--accent)}.btn-primary:hover{background:var(--accent-hover)}.btn-secondary{color:var(--accent);background:transparent;border:1px solid var(--accent)}.btn-secondary:hover{background:#22d3ee14}.error-alert{padding:.625rem .75rem;font-family:var(--font-mono);font-size:.8rem;color:var(--error);background:var(--error-bg);border:1px solid rgba(248,113,113,.25);border-radius:var(--radius)}.preview-panel{min-height:280px}.preview-content{flex:1;display:flex;align-items:center;justify-content:center;min-height:200px}.preview-empty{display:flex;align-items:center;justify-content:center;width:100%;min-height:200px;border:1px dashed var(--border);border-radius:var(--radius);background:var(--surface-raised)}.preview-empty span{font-family:var(--font-mono);font-size:.8rem;color:var(--text-muted)}.qr-code-mat{display:flex;align-items:center;justify-content:center;width:100%;padding:1rem;background:#fff;border-radius:var(--radius);border:1px solid var(--border)}.qr-code-mat img{width:100%;max-width:280px;height:auto;display:block}.preview-hint{margin:0;font-family:var(--font-mono);font-size:.75rem;color:var(--text-muted);text-align:center}.about-main{flex:1}.about-content{gap:1.25rem}.about-section{display:flex;flex-direction:column;gap:.625rem}.about-section h3{margin:0;font-family:var(--font-sans);font-size:1rem;font-weight:600;color:var(--text)}.about-section p{margin:0;font-size:.9rem;line-height:1.6;color:var(--text-muted)}.about-steps{margin:0;padding-left:1.25rem;font-size:.9rem;line-height:1.6;color:var(--text-muted)}.about-steps li{margin-bottom:.5rem}.about-steps li:last-child{margin-bottom:0}.about-cta{margin:.5rem 0 0}.about-cta-link{display:inline-flex;align-items:center;justify-content:center;width:auto;min-width:12rem;text-decoration:none;color:var(--bg)}.about-cta-link:hover{color:var(--bg)}.app-footer{padding-top:.5rem;border-top:1px solid var(--border);text-align:center}.app-footer p{margin:.375rem 0;font-family:var(--font-mono);font-size:.75rem;color:var(--text-muted)}.app-footer a{color:var(--accent)}.app-footer a:hover{color:var(--accent-hover)}@media (max-width: 767px){.app-container{padding:1rem;gap:1rem}.app-title{font-size:1.25rem}.app-header{flex-direction:column;align-items:stretch}.app-header-nav{align-self:flex-start}.pattern-btn{padding:.375rem .125rem;font-size:.65rem}}