:root{--c-primary:#0EA5E9;--c-primary-light:#38BDF8;--c-primary-dim:rgba(14,165,233,0.1);--c-accent:#10B981;--c-bg:#0A1628;--c-surface:#111D33;--c-surface-2:#1A2A42;--c-border:#2A3A52;--c-text:#E2E8F0;--c-text-dim:#94A3B8;--c-text-muted:#64748B;--c-success:#10B981;--c-danger:#EF4444;--radius:12px;--radius-sm:8px;--radius-xs:6px;--font-sans:'Inter',system-ui,sans-serif;--font-mono:'JetBrains Mono',monospace;--transition:200ms ease;--shadow:0 4px 24px rgba(0,0,0,0.5)}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:var(--font-sans);background:var(--c-bg);color:var(--c-text);line-height:1.6;min-height:100vh;background-image:radial-gradient(ellipse at 30% 0%,rgba(14,165,233,0.06) 0%,transparent 60%)}
::-webkit-scrollbar{width:6px}::-webkit-scrollbar-thumb{background:var(--c-border);border-radius:3px}
::selection{background:var(--c-primary-dim);color:var(--c-primary)}
:focus-visible{outline:2px solid var(--c-primary);outline-offset:2px}
#app-header{position:sticky;top:0;z-index:100;background:rgba(17,29,51,0.88);backdrop-filter:blur(16px);border-bottom:1px solid var(--c-border)}
.header-inner{max-width:960px;margin:0 auto;padding:0.75rem 1.5rem;display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap}
.logo-group{display:flex;align-items:center;gap:0.6rem}
.logo-icon{width:36px;height:36px;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-sm);background:var(--c-primary-dim);color:var(--c-primary)}
h1{font-size:1.1rem;font-weight:700;background:linear-gradient(135deg,var(--c-primary),var(--c-primary-light));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.header-actions{display:flex;align-items:center;gap:0.75rem}
.toggle-label{display:flex;align-items:center;gap:0.35rem;font-size:0.75rem;color:var(--c-text-dim);cursor:pointer}
.toggle-label input{accent-color:var(--c-primary)}
.btn{display:inline-flex;align-items:center;gap:0.35rem;padding:0.45rem 0.9rem;font-size:0.8125rem;font-weight:500;font-family:var(--font-sans);border:none;border-radius:var(--radius-xs);cursor:pointer;transition:all var(--transition);white-space:nowrap}
.btn:disabled{opacity:0.4;cursor:not-allowed}
.btn-primary{background:linear-gradient(135deg,var(--c-primary),#0284C7);color:#fff;font-weight:600}
.btn-primary:hover:not(:disabled){filter:brightness(1.1);transform:translateY(-1px);box-shadow:0 3px 12px rgba(14,165,233,0.3)}
.btn-outline{background:transparent;color:var(--c-text-dim);border:1px solid var(--c-border)}
.btn-outline:hover{border-color:var(--c-primary);color:var(--c-primary);background:var(--c-primary-dim)}
.btn-ghost{background:transparent;color:var(--c-text-dim)}
.btn-ghost:hover{background:var(--c-surface-2);color:var(--c-text)}
.btn-sm{padding:0.3rem 0.6rem;font-size:0.75rem}
.action-group{display:flex;gap:0.35rem}
#app-main{max-width:960px;margin:0 auto;padding:1.5rem;display:flex;flex-direction:column;gap:1.25rem;position:relative}
.panel-card{background:var(--c-surface);border:1px solid var(--c-border);border-radius:var(--radius);padding:1.25rem}
.panel-card h2{font-size:0.8125rem;font-weight:600;color:var(--c-text-muted);text-transform:uppercase;letter-spacing:0.05em;margin-bottom:0.75rem}
.panel-title-row{display:flex;justify-content:space-between;align-items:center;margin-bottom:0.75rem}
.panel-title-row h2{margin-bottom:0}
.hidden{display:none !important}
.elements-list{display:flex;flex-direction:column;gap:0.75rem}
.element-row{display:flex;gap:0.5rem;align-items:flex-start}
.element-name{width:120px;padding:0.45rem 0.6rem;font-family:var(--font-mono);font-size:0.8125rem;color:var(--c-primary);background:var(--c-surface-2);border:1px solid var(--c-border);border-radius:var(--radius-xs);flex-shrink:0}
.element-name:focus{border-color:var(--c-primary);outline:none}
.code-textarea{flex:1;padding:0.45rem 0.6rem;font-family:var(--font-mono);font-size:0.8125rem;line-height:1.6;color:var(--c-text);background:var(--c-surface-2);border:1px solid var(--c-border);border-radius:var(--radius-xs);resize:vertical}
.code-textarea:focus{border-color:var(--c-primary);outline:none}
.input-actions{display:flex;justify-content:space-between;align-items:center;margin-top:0.5rem}
.input-actions span{font-size:0.6875rem;color:var(--c-text-muted);font-family:var(--font-mono)}
.comparison-grid{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.compare-col h3{font-size:0.6875rem;font-weight:600;color:var(--c-text-muted);text-transform:uppercase;letter-spacing:0.05em;margin-bottom:0.4rem}
.code-output{padding:0.75rem 1rem;font-family:var(--font-mono);font-size:0.8125rem;line-height:1.7;color:var(--c-text);background:var(--c-surface-2);border:1px solid var(--c-border);border-radius:var(--radius-sm);overflow-x:auto;white-space:pre;tab-size:2;max-height:500px;overflow-y:auto}
.css-prop{color:var(--c-primary-light)}.css-val{color:#F59E0B}.css-sel{color:var(--c-primary);font-weight:600}.css-comment{color:var(--c-text-muted);font-style:italic}.css-bracket{color:var(--c-text-dim)}
.group-label{color:var(--c-accent);font-weight:600;font-style:italic;opacity:0.7}
.presets-dropdown{position:absolute;top:0;right:1.5rem;background:var(--c-surface);border:1px solid var(--c-border);border-radius:var(--radius-sm);box-shadow:var(--shadow);padding:0.35rem;z-index:200;animation:fadeIn 150ms ease}
.preset-item{display:block;width:100%;padding:0.5rem 0.75rem;font-size:0.8125rem;font-family:var(--font-sans);color:var(--c-text-dim);background:none;border:none;text-align:left;cursor:pointer;border-radius:var(--radius-xs);transition:all var(--transition)}
.preset-item:hover{background:var(--c-primary-dim);color:var(--c-primary)}
#toast-container{position:fixed;bottom:1.5rem;right:1.5rem;display:flex;flex-direction:column;gap:0.5rem;z-index:1000}
.toast{padding:0.6rem 1rem;font-size:0.8125rem;border-radius:var(--radius-sm);background:var(--c-surface-2);border:1px solid var(--c-border);color:var(--c-text);box-shadow:var(--shadow);animation:fadeIn 250ms ease;max-width:300px}
.toast.success{border-left:3px solid var(--c-success)}.toast.error{border-left:3px solid var(--c-danger)}
@keyframes fadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
@media(max-width:700px){.comparison-grid{grid-template-columns:1fr}.element-row{flex-direction:column}.element-name{width:100%}}