@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400&display=swap');
[data-theme="dark"]{--bg:#0f0f14;--bg-surface:#16161d;--bg-card:#1e1e28;--bg-input:#1a1a24;--border:#2a2a3a;--text:#e8e8ef;--text-secondary:#a0a0b8;--text-muted:#6b6b80;--accent:#6366f1;--accent-subtle:rgba(99,102,241,0.12);--glass-bg:rgba(30,30,40,0.7);--glass-border:rgba(255,255,255,0.08)}
[data-theme="light"]{--bg:#f5f5f7;--bg-surface:#fff;--bg-card:#fff;--bg-input:#f8f8fc;--border:#e0e0e8;--text:#1a1a2e;--text-secondary:#4a4a60;--text-muted:#8888a0;--accent:#6366f1;--glass-bg:rgba(255,255,255,0.75);--glass-border:rgba(0,0,0,0.06)}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:'Inter',sans-serif;background:var(--bg);color:var(--text);min-height:100vh}
.container{max-width:1200px;margin:0 auto;padding:0 1rem}
.navbar{position:sticky;top:0;z-index:200;backdrop-filter:blur(16px);background:var(--glass-bg);border-bottom:1px solid var(--glass-border);padding:.4rem 0}
.nav-inner{display:flex;align-items:center;justify-content:space-between}
.brand{font-weight:700;font-size:1.1rem;color:var(--text);text-decoration:none}
.nav-links{display:flex;gap:.5rem;align-items:center}
.glass-card{background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:12px;padding:1rem;backdrop-filter:blur(12px)}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:.5rem 1rem;border:none;border-radius:8px;font-weight:600;font-size:.85rem;cursor:pointer;transition:all .15s}
.btn-primary{background:linear-gradient(135deg,#6366f1,#8b5cf6);color:#fff}
.btn-secondary{background:var(--bg-card);color:var(--text);border:1px solid var(--border)}
.btn-sm{padding:.3rem .6rem;font-size:.8rem}
.w-full{width:100%}
.theme-btn{background:var(--bg-card);border:1px solid var(--border);border-radius:8px;padding:2px 8px;cursor:pointer;font-size:1rem}
input[type="range"]{width:100%;accent-color:var(--accent)}
input[type="number"],input[type="text"]{width:100%;padding:.4rem .6rem;background:var(--bg-input);color:var(--text);border:1px solid var(--border);border-radius:6px;font-family:'JetBrains Mono',monospace;font-size:.8rem}
label{display:flex;flex-direction:column;gap:.2rem;font-size:.8rem;color:var(--text-muted);margin-bottom:.5rem}

.app-layout{display:grid;grid-template-columns:240px 1fr;gap:1rem;min-height:calc(100vh - 70px)}
.sidebar{overflow-y:auto;max-height:calc(100vh - 80px);display:flex;flex-direction:column;gap:.3rem}
.canvas-wrap{position:relative;background:var(--bg-surface);border-radius:12px;overflow:hidden;border:1px solid var(--border)}
#graphCanvas{width:100%;height:auto;display:block;cursor:crosshair}
.range-row{display:flex;gap:.3rem;align-items:center}
.range-row input{flex:1}
.range-row span{font-size:.75rem;color:var(--text-muted)}
.func-row{display:flex;gap:.3rem;align-items:center;margin-bottom:.3rem}
.func-row input[type="text"]{flex:1}
.func-row .color-dot{width:20px;height:20px;border-radius:50%;border:2px solid var(--border);cursor:pointer;flex-shrink:0}
.func-row .del-btn{background:none;border:none;color:var(--danger,#ef4444);cursor:pointer;font-size:1rem;flex-shrink:0}
.trace-info{position:absolute;top:8px;right:8px;background:var(--glass-bg);backdrop-filter:blur(8px);padding:.3rem .6rem;border-radius:8px;font-size:.75rem;font-family:'JetBrains Mono',monospace;color:var(--text-secondary);border:1px solid var(--glass-border)}
@media(max-width:768px){.app-layout{grid-template-columns:1fr}.sidebar{max-height:none}}