:root{--bg-app:#f1f5f9;--accent:#2563eb;--text-main:#0f172a;--text-muted:#64748b;--border:#e2e8f0;--header-h:60px;--sidebar-w:320px}*{box-sizing:border-box;margin:0;padding:0}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:#cbd5e1;border-radius:10px}::-webkit-scrollbar-thumb:hover{background:#94a3b8}body{background:var(--bg-app);color:var(--text-main);-webkit-font-smoothing:antialiased;height:100vh;font-family:Roboto Mono,monospace;overflow:hidden}.main-header{height:var(--header-h);border-bottom:1px solid var(--border);z-index:1000;background:#fff;justify-content:space-between;align-items:center;width:100%;padding:0 32px;display:flex;position:fixed;top:0}.header-left,.header-right{align-items:center;display:flex}.logo-box{letter-spacing:-.04em;color:var(--accent);cursor:default;align-items:center;gap:10px;font-size:22px;font-weight:700;display:flex}.logo-box.clickable{cursor:pointer}.logo-box.clickable:hover{opacity:.7;transition:opacity .2s}.logo-dot{background:var(--accent);border-radius:50%;flex-shrink:0;width:12px;height:12px;animation:2.5s infinite pulse-dot;box-shadow:0 0 #2563eb66}@keyframes pulse-dot{0%{box-shadow:0 0 #2563eb66}70%{box-shadow:0 0 0 8px #2563eb00}to{box-shadow:0 0 #2563eb00}}.btn-ghost{border:1px solid var(--border);letter-spacing:.05em;cursor:pointer;color:var(--text-muted);background:0 0;border-radius:6px;align-items:center;gap:8px;padding:7px 14px;font-family:Roboto Mono,monospace;font-size:10px;font-weight:700;transition:all .2s;display:flex}.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}.landing-container{margin-top:var(--header-h);height:calc(100vh - var(--header-h));padding:0;overflow-y:auto}.hero-section{border-bottom:1px solid var(--border);text-align:center;background:#fff;padding:64px 48px 56px}.hero-title{letter-spacing:-.02em;color:var(--text-main);margin-bottom:20px;font-size:38px;font-weight:700;line-height:1.2}.hero-subtitle{color:var(--accent);opacity:.85;max-width:480px;margin:0 auto;font-size:13px;line-height:1.8}.subjects-grid{background:var(--bg-app);grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:24px;padding:40px 48px;display:grid}.section-card{border:1px solid var(--border);cursor:pointer;background:#fff;border-radius:12px;padding:40px;transition:all .25s cubic-bezier(.4,0,.2,1);position:relative;box-shadow:0 1px 3px #0000000f}.section-card:hover{border-color:var(--accent);transform:translateY(-4px);box-shadow:0 12px 24px -4px #0000001a}.section-card:hover .section-card-name{color:var(--accent)}.section-badge{letter-spacing:.15em;color:var(--accent);text-transform:uppercase;align-items:center;gap:6px;margin-bottom:20px;font-size:9px;font-weight:700;display:flex}.section-badge:before{content:"";background:var(--accent);opacity:.5;border-radius:50%;width:6px;height:6px;display:inline-block}.section-card-icon{width:40px;height:40px;color:var(--accent);background:#eff6ff;border-radius:8px;justify-content:center;align-items:center;margin-bottom:20px;transition:all .2s;display:flex}.section-card:hover .section-card-icon{background:var(--accent);color:#fff}.section-card-name{letter-spacing:-.02em;margin-bottom:10px;font-size:15px;font-weight:700;transition:color .2s}.section-card-desc{color:var(--text-muted);margin-bottom:28px;font-size:11px;line-height:1.8}.section-card-modules{color:var(--accent);letter-spacing:.08em;font-size:10px;font-weight:700}.app-main{margin-top:var(--header-h);grid-template-columns:var(--sidebar-w) 1fr;height:calc(100vh - var(--header-h));display:grid}.sidebar{border-right:1px solid var(--border);background:#fff;flex-direction:column;gap:20px;padding:28px 24px;display:flex;overflow-y:auto}.sidebar-header{justify-content:space-between;align-items:center;margin-bottom:8px;display:flex}.sidebar-footer{border-top:1px solid var(--border);margin-top:auto;padding-top:16px}.section-label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.15em;margin-bottom:12px;font-size:9px;font-weight:700;display:block}.function-params-card{border:1px solid var(--border);border-radius:8px;padding:20px}.param-row{margin-bottom:20px}.param-header{justify-content:space-between;align-items:center;margin-bottom:10px;display:flex}.param-value{color:var(--accent);background:#eff6ff;border-radius:4px;padding:2px 8px;font-size:12px;font-weight:700}input[type=range]{-webkit-appearance:none;background:#e2e8f0;border-radius:2px;outline:none;width:100%;height:4px}input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;background:var(--accent);cursor:pointer;border:2px solid #fff;border-radius:50%;width:14px;height:14px;box-shadow:0 1px 3px #00000026}.dynamic-preview{border-left:3px solid var(--accent);background:#f8fafc;border-radius:0 6px 6px 0;margin-top:8px;padding:14px 16px}.preview-formula{color:var(--text-main);margin-top:4px;font-size:16px;font-weight:700}.btn-primary{background:var(--accent);color:#fff;letter-spacing:.1em;cursor:pointer;border:none;border-radius:6px;width:100%;padding:12px;font-family:Roboto Mono,monospace;font-size:11px;font-weight:700;transition:background .2s}.btn-primary:hover{background:#1d4ed8}.content-area{background:var(--bg-app);padding:24px 24px 80px;display:block;overflow-y:auto}.content-header{border:1px solid var(--border);background:#fff;border-radius:8px;justify-content:space-between;align-items:center;margin-bottom:20px;padding:4px 16px 4px 4px;display:flex}.tabs-scroll{gap:4px;display:flex}.tab-btn{color:var(--text-muted);cursor:pointer;letter-spacing:.05em;background:0 0;border:none;border-radius:6px;padding:10px 16px;font-family:Roboto Mono,monospace;font-size:10px;font-weight:700;transition:all .2s}.tab-btn.active{color:var(--accent);background:#eff6ff}.tab-btn:hover:not(.active){background:#f8fafc}.mode-switch{background:#f1f5f9;border-radius:6px;gap:3px;padding:3px;display:flex}.mode-btn{color:var(--text-muted);cursor:pointer;letter-spacing:.05em;background:0 0;border:none;border-radius:4px;padding:6px 12px;font-family:Roboto Mono,monospace;font-size:10px;font-weight:700;transition:all .2s}.mode-btn.active{color:var(--text-main);background:#fff;box-shadow:0 1px 2px #00000014}.content-body{flex-direction:column;gap:16px;display:flex}.diagram-card{border:1px solid var(--border);background:#fff;border-radius:8px;flex-direction:column;height:520px;display:flex;position:relative;overflow:hidden}.diagram-viewport{flex:1;overflow:hidden}.cartesian-header{border-bottom:1px solid var(--border);flex-shrink:0;justify-content:space-between;align-items:center;padding:12px 20px;display:flex}.results-panel{border:1px solid var(--border);background:#fff;border-radius:6px;min-width:180px;padding:12px 16px;font-size:11px;position:absolute;bottom:16px;left:16px;box-shadow:0 4px 6px -1px #0000001a}.markdown-body{border:1px solid var(--border);background:#fff;border-radius:8px;padding:28px 32px;font-size:13px;line-height:1.8}.markdown-body h1,.markdown-body h2,.markdown-body h3{letter-spacing:-.02em;margin:24px 0 12px}.markdown-body code{background:#f1f5f9;border-radius:3px;padding:2px 6px;font-family:Roboto Mono,monospace;font-size:12px}#dashboard-root{flex-direction:column;gap:56px;padding:40px 48px 64px;display:flex}.dashboard-section-header{border-bottom:2px solid var(--border);justify-content:space-between;align-items:flex-end;margin-bottom:24px;padding-bottom:16px;display:flex}.dashboard-section-title{letter-spacing:-.03em;margin-bottom:4px;font-size:22px;font-weight:700}.dashboard-section-tag{color:var(--text-muted);letter-spacing:.12em;text-transform:uppercase;font-size:10px}.badge-soon{letter-spacing:.1em;color:var(--text-muted);border:1px solid var(--border);background:#f1f5f9;border-radius:4px;padding:4px 10px;font-size:9px;font-weight:700}.units-grid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px;display:grid}.unit-card{border:1px solid var(--border);cursor:pointer;background:#fff;border-radius:12px;padding:28px;transition:all .25s cubic-bezier(.4,0,.2,1);box-shadow:0 1px 2px #0000000a}.unit-card:hover{border-color:var(--card-color,var(--accent));transform:translateY(-3px);box-shadow:0 8px 20px -4px #0000001a}.unit-card--disabled{opacity:.45;cursor:default;filter:grayscale(.5)}.unit-card--disabled:hover{border-color:var(--border);transform:none;box-shadow:0 1px 2px #0000000a}.unit-card-icon{background:#f8fafc;border-radius:10px;justify-content:center;align-items:center;width:40px;height:40px;margin-bottom:16px;transition:background .2s;display:flex}.unit-card-name{letter-spacing:-.02em;margin-bottom:8px;font-size:14px;font-weight:700}.unit-card-desc{color:var(--text-muted);margin-bottom:20px;font-size:11px;line-height:1.7}.unit-card-cta{letter-spacing:.08em;font-size:10px;font-weight:700}