@import"https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Space+Grotesk:wght@500;700&family=Fira+Code:wght@400;500&display=swap";:root{--primary: #06b6d4;--primary-hover: #0891b2;--accent: #a855f7;--bg-dark: #0f172a;--bg-panel: #1e293b;--bg-card: #020617;--text-main: #f8fafc;--text-muted: #94a3b8;--border: #334155}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Inter,sans-serif;background-color:var(--bg-dark);color:var(--text-main);line-height:1.6;-webkit-font-smoothing:antialiased;background-image:radial-gradient(circle at 15% 50%,rgba(6,182,212,.05),transparent 25%),radial-gradient(circle at 85% 30%,rgba(168,85,247,.05),transparent 25%)}h1,h2,h3,.logo{font-family:Space Grotesk,sans-serif}code,.math-font{font-family:Fira Code,monospace}.container{max-width:1000px;margin:0 auto;padding:0 24px}header{position:fixed;top:0;width:100%;height:80px;display:flex;align-items:center;z-index:100;background:#0f172acc;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid rgba(255,255,255,.05)}.header-content{display:flex;justify-content:space-between;align-items:center;width:100%}.logo{font-size:1.5rem;font-weight:700;display:flex;align-items:center;gap:12px;color:var(--text-main)}.logo span{color:var(--primary)}.btn{padding:12px 24px;border-radius:8px;font-weight:600;font-size:.95rem;cursor:pointer;transition:all .2s ease;border:none;display:inline-flex;align-items:center;justify-content:center;gap:8px}.btn-primary{background-color:var(--primary);color:#fff;box-shadow:0 4px 14px #06b6d44d}.btn-primary:hover{background-color:var(--primary-hover);transform:translateY(-1px);box-shadow:0 6px 20px #06b6d466}.btn-outline{background:transparent;color:var(--text-main);border:1px solid rgba(255,255,255,.1)}.btn-outline:hover{background:#ffffff0d}.hero{padding:160px 0 80px;text-align:center}.hero h1{font-size:4rem;font-weight:700;line-height:1.1;margin-bottom:24px;background:linear-gradient(135deg,#fff,#94a3b8);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.hero p{font-size:1.25rem;color:var(--text-muted);max-width:600px;margin:0 auto 40px}.solver-container{background:var(--bg-card);border:1px solid var(--border);border-radius:16px;padding:30px;box-shadow:0 25px 50px -12px #00000080;margin-top:40px;text-align:left}.input-group{margin-bottom:24px}.input-label{display:block;font-size:.85rem;text-transform:uppercase;letter-spacing:.1em;color:var(--text-muted);margin-bottom:12px;font-weight:600}.math-input-wrapper{position:relative;display:flex;align-items:center}.math-input{width:100%;background:var(--bg-panel);border:1px solid var(--border);border-radius:12px;padding:20px 24px;font-size:1.5rem;color:var(--text-main);outline:none;transition:all .2s}.math-input:focus{border-color:var(--primary);box-shadow:0 0 0 3px #06b6d433}.solve-btn{position:absolute;right:12px;padding:10px 20px;border-radius:8px}.result-box{background:#06b6d40d;border:1px solid rgba(6,182,212,.2);border-radius:12px;padding:24px;margin-top:24px}.result-header{display:flex;align-items:center;gap:8px;color:var(--primary);font-weight:600;margin-bottom:16px;font-size:.9rem}.result-value{font-size:2rem;color:var(--text-main)}.step-by-step{margin-top:24px;border-top:1px solid var(--border);padding-top:24px}.step{display:flex;gap:16px;margin-bottom:16px}.step-number{width:28px;height:28px;border-radius:50%;background:var(--bg-panel);display:flex;align-items:center;justify-content:center;font-size:.8rem;font-weight:600;color:var(--text-muted);flex-shrink:0}.step-content{color:var(--text-muted);font-size:.95rem;padding-top:3px}.step-math{margin-top:8px;color:var(--text-main);font-size:1.1rem}.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:60px}.feature-card{background:var(--bg-panel);border:1px solid var(--border);border-radius:12px;padding:24px;text-align:left}.feature-card h3{font-size:1.1rem;margin-bottom:8px;display:flex;align-items:center;gap:8px}.feature-card p{font-size:.9rem;color:var(--text-muted)}@media (max-width: 900px){.features-grid{grid-template-columns:1fr}.hero h1{font-size:2.5rem}.math-input{font-size:1.2rem}.solve-btn{position:relative;width:100%;right:0;margin-top:12px}.math-input-wrapper{flex-direction:column}}