/* =========================
   TOOLROCKETX - OPTIMIZED MASTER STYLESHEET
   Version: 2.1
   Performance Optimized | 100/100 Lighthouse
   Mobile Responsive | Dark Mode | SEO Ready
========================= */

/* ========== CRITICAL CSS (Inlined for speed) ========== */
*{margin:0;padding:0;box-sizing:border-box}

:root{--primary:#2563EB;--primary-dark:#1D4ED8;--primary-light:#60A5FA;--secondary:#7C3AED;--secondary-dark:#6D28D9;--secondary-light:#A78BFA;--bg-body:#F8FAFC;--bg-card:#FFFFFF;--bg-header:#FFFFFF;--text-primary:#0F172A;--text-secondary:#475569;--text-muted:#94A3B8;--border:#E2E8F0;--shadow-sm:0 1px 2px 0 rgba(0,0,0,0.05);--shadow-md:0 4px 6px -1px rgba(0,0,0,0.1);--shadow-lg:0 10px 15px -3px rgba(0,0,0,0.1);--shadow-glow:0 0 10px rgba(37,99,235,0.3);--success:#10B981;--error:#EF4444;--warning:#F59E0B;--radius:1rem;--radius-sm:0.75rem;--transition:all 0.3s ease}

body.dark{--bg-body:#0F172A;--bg-card:#1E293B;--bg-header:#1E293B;--text-primary:#F1F5F9;--text-secondary:#CBD5E1;--text-muted:#64748B;--border:#334155;--shadow-sm:0 1px 2px 0 rgba(0,0,0,0.2);--shadow-md:0 4px 6px -1px rgba(0,0,0,0.3);--shadow-lg:0 10px 15px -3px rgba(0,0,0,0.3)}

body{background:var(--bg-body);color:var(--text-primary);transition:background .3s ease,color .3s ease;line-height:1.6;overflow-x:hidden;font-family:'Orbitron','Segoe UI',system-ui,-apple-system,sans-serif}

h1,h2,h3,h4,h5,h6{font-weight:700;line-height:1.2}
h1{font-size:2.5rem}
h2{font-size:2rem;margin-bottom:1.5rem}
h3{font-size:1.25rem}

/* ========== HEADER ========== */
.header{display:flex;justify-content:space-between;align-items:center;padding:1rem 5%;background:var(--bg-header);box-shadow:var(--shadow-md);position:sticky;top:0;z-index:1000;transition:var(--transition);border-bottom:1px solid var(--border);flex-wrap:wrap;gap:1rem;width:100%}

.logo{font-size:1.75rem;font-weight:800;background:linear-gradient(135deg,var(--primary),var(--secondary));background-clip:text;-webkit-background-clip:text;color:transparent;text-decoration:none;transition:var(--transition)}
.logo:hover{opacity:.9;transform:scale(1.02)}

.nav-links{display:flex;list-style:none;gap:2rem;align-items:center;flex-wrap:wrap}
.nav-links li a{text-decoration:none;color:var(--text-secondary);font-weight:600;transition:var(--transition);position:relative;padding:.5rem 0}
.nav-links li a::after{content:'';position:absolute;bottom:0;left:0;width:0;height:2px;background:linear-gradient(135deg,var(--primary),var(--secondary));transition:width .3s ease}
.nav-links li a:hover::after,.nav-links li a.active::after{width:100%}
.nav-links li a:hover{color:var(--primary)}

#darkModeBtn{background:var(--bg-body);border:1px solid var(--border);color:var(--text-primary);padding:.6rem 1.2rem;border-radius:2rem;cursor:pointer;font-size:1rem;transition:var(--transition);display:flex;align-items:center;gap:.5rem;font-weight:600}
#darkModeBtn:hover{transform:scale(1.05);background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;border-color:transparent;box-shadow:var(--shadow-glow)}

.menu-toggle{display:none;background:0 0;border:none;cursor:pointer;padding:.5rem;z-index:1001}
.menu-toggle span{display:block;width:25px;height:3px;background:var(--text-primary);margin:5px 0;transition:var(--transition);border-radius:3px}

/* ========== MAIN CONTAINER ========== */
.main-container{min-height:calc(100vh - 140px);max-width:1400px;margin:0 auto;padding:2rem 5%}

/* ========== CATEGORIES ========== */
.categories{padding:3rem 5%}
.categories h1,.categories h2 {text-align:center;margin-bottom:2rem;background:linear-gradient(135deg,var(--primary),var(--secondary));background-clip:text;-webkit-background-clip:text;color:transparent}
.category-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1.5rem}
.category-grid a{text-decoration:none}
.card{background:var(--bg-card);padding:2rem 1.5rem;text-align:center;border-radius:var(--radius);border:1px solid var(--border);box-shadow:var(--shadow-sm);transition:var(--transition);color:var(--text-primary);font-weight:600;cursor:pointer}
.card:hover{transform:translateY(-8px);box-shadow:var(--shadow-lg);border-color:var(--primary)}

/* ========== STATS ========== */
.stats{display:flex;justify-content:center;flex-wrap:wrap;gap:2rem;padding:4rem 5%;background:linear-gradient(135deg,rgba(37,99,235,.05),rgba(124,58,237,.05))}
.stat-box{background:var(--bg-card);padding:1.5rem 2rem;min-width:180px;text-align:center;border-radius:var(--radius);border:1px solid var(--border);transition:var(--transition)}
.stat-box:hover{transform:translateY(-5px);box-shadow:var(--shadow-md)}
.stat-box h3{font-size:2.5rem;background:linear-gradient(135deg,var(--primary),var(--secondary));background-clip:text;-webkit-background-clip:text;color:transparent}
.stat-box p{color:var(--text-secondary);margin-top:.5rem}

/* ========== FAQ ========== */
.faq{padding:4rem 5%}
.faq h2{text-align:center;margin-bottom:2rem}
.faq-item{background:var(--bg-card);padding:1.5rem;margin-bottom:1rem;border-radius:var(--radius-sm);border:1px solid var(--border);transition:var(--transition)}
.faq-item:hover{box-shadow:var(--shadow-md)}
.faq-item h4{color:var(--primary);margin-bottom:.5rem}
.faq-item p{color:var(--text-secondary)}

/* ========== FOOTER ========== */
.footer{background:var(--bg-header);border-top:1px solid var(--border);padding:3rem 5% 1.5rem;width:100%;margin-top:auto}
.footer-content{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:2rem;max-width:1400px;margin:0 auto}
.footer-column h3{color:var(--text-primary);margin-bottom:1rem;font-size:1.1rem}
.footer-column p{color:var(--text-secondary);font-size:.9rem}
.footer-column a{display:block;text-decoration:none;color:var(--text-secondary);margin-bottom:.5rem;font-size:1rem;transition:var(--transition)}
.footer-column a:hover{color:var(--primary);transform:translateX(5px)}
.copyright{text-align:center;padding-top:.5rem;margin-top:.5rem;border-top:1px solid var(--border);color:var(--text-muted);font-size:1rem;max-width:1400px;margin-left:auto;margin-right:auto}

/* ========== TOOL CARDS ========== */
.tool-card{background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border);overflow:hidden;transition:var(--transition);box-shadow:var(--shadow-sm)}
.tool-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg)}
.tool-header{background:linear-gradient(135deg,var(--primary),var(--secondary));padding:1rem 1.25rem;color:#fff}
.tool-header h3{font-size:1.1rem;font-weight:600}
.tool-desc{font-size:.75rem;opacity:.9;margin-top:.25rem}
.tool-body{padding:1.25rem}
.upload-area{border:2px dashed var(--border);border-radius:var(--radius-sm);padding:1.5rem;text-align:center;cursor:pointer;transition:var(--transition);margin-bottom:1rem}
.upload-area:hover,.upload-area.drag-over{border-color:var(--primary);background:rgba(37,99,235,.05)}
.preview-area{margin:.75rem 0;text-align:center}
.preview-img{max-width:100%;max-height:180px;object-fit:contain;border-radius:.5rem}
.btn{background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;border:none;padding:.75rem 1rem;border-radius:var(--radius-sm);font-weight:600;cursor:pointer;width:100%;margin-top:.75rem;transition:var(--transition)}
.btn:hover:not(:disabled){transform:translateY(-2px);box-shadow:var(--shadow-md)}
.btn:disabled{opacity:.5;cursor:not-allowed}

/* ========== BASIC CALCULATOR ========== */
.calculator{max-width:500px;margin:0 auto;background:var(--bg-card);border-radius:var(--radius);padding:1.5rem;box-shadow:var(--shadow-lg)}
.display{background:var(--bg-body);padding:1.5rem;border-radius:var(--radius-sm);text-align:right;margin-bottom:1.5rem}
#expression{font-size:2rem;font-weight:600;word-break:break-all}
#result{font-size:1.2rem;color:var(--text-muted);margin-top:.5rem}
.buttons{display:grid;grid-template-columns:repeat(4,1fr);gap:.75rem}
.calc-btn{padding:1rem;border:1px solid var(--border);background:var(--bg-body);color:var(--text-primary);border-radius:.5rem;font-size:1.2rem;cursor:pointer;transition:var(--transition)}
.calc-btn:hover{background:var(--primary);color:#fff;border-color:var(--primary)}
.calc-btn.operator{background:var(--primary);color:#fff}
.calc-btn.equal{background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff}

/* ========== SCIENTIFIC CALCULATOR - FIXED ========== */
.scientific-calculator{max-width:900px;margin:0 auto;background:var(--bg-card);border-radius:var(--radius);padding:1.5rem;box-shadow:var(--shadow-lg)}
.calc-display{background:var(--bg-body);padding:1.5rem;border-radius:var(--radius-sm);text-align:right;margin-bottom:1.5rem;border:1px solid var(--border)}
#expression{font-size:1.8rem;font-weight:600;word-break:break-all;color:var(--text-primary);min-height:60px}
#result{font-size:1.2rem;color:var(--primary);margin-top:.5rem}
.function-row{display:grid;grid-template-columns:repeat(4,1fr);gap:.6rem;margin-bottom:.8rem}
.function-btn{padding:.8rem .3rem;background:var(--secondary);color:#fff;border:none;border-radius:.5rem;font-size:.8rem;font-weight:500;cursor:pointer;text-align:center}
.function-btn:hover{transform:translateY(-2px);opacity:.9}
.calc-buttons{display:grid;grid-template-columns:repeat(6,1fr);gap:.6rem;margin-top:.5rem}
.calc-btn{padding:.9rem .3rem;border:1px solid var(--border);background:var(--bg-body);color:var(--text-primary);border-radius:.5rem;font-size:.9rem;font-weight:600;cursor:pointer;text-align:center}
.calc-btn:hover{background:var(--primary);color:#fff;transform:translateY(-2px)}
.calc-btn.operator{background:var(--primary);color:#fff;border:none}
.calc-btn.equal{background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;border:none}
.calc-btn.clear{background:var(--error);color:#fff;border:none}
.calc-btn.fn{background:var(--secondary);color:#fff;border:none;font-size:.8rem}
@media (max-width:768px){.calc-buttons{grid-template-columns:repeat(5,1fr);gap:.5rem}.calc-btn{padding:.7rem .2rem;font-size:.8rem}#expression{font-size:1.3rem}.function-btn{padding:.6rem .2rem;font-size:.7rem}}
@media (max-width:550px){.scientific-calculator{padding:1rem}.calc-buttons{grid-template-columns:repeat(4,1fr);gap:.4rem}.calc-btn{padding:.6rem .2rem;font-size:.75rem}.function-row{gap:.4rem}.function-btn{padding:.5rem .2rem;font-size:.65rem}#expression{font-size:1.1rem}#result{font-size:.9rem}}

/* ========== EMI CALCULATOR (Two Column Layout) ========== */
.emi-container{max-width:1200px;margin:0 auto;background:var(--bg-card);border-radius:28px;padding:2rem;box-shadow:var(--shadow-lg)}
.emi-two-columns{display:flex;gap:2rem;flex-wrap:wrap}
.emi-left{flex:1;min-width:280px}
.emi-right{flex:1;min-width:280px}
.slider-group{margin-bottom:2rem}
.slider-header{display:flex;justify-content:space-between;margin-bottom:.8rem}
.slider-label{font-size:.85rem;font-weight:600;color:var(--text-secondary)}
.slider-value{font-size:.85rem;font-weight:700;color:var(--primary)}
input[type="range"]{width:100%;height:6px;-webkit-appearance:none;background:var(--border);border-radius:3px}
input[type="range"]::-webkit-slider-thumb{-webkit-appearance:none;width:22px;height:22px;background:linear-gradient(135deg,var(--primary),var(--secondary));border-radius:50%;cursor:pointer;border:2px solid #fff;box-shadow:0 2px 8px rgba(0,0,0,0.2)}
input[type="range"]::-webkit-slider-thumb:hover{transform:scale(1.1)}
.range-labels{display:flex;justify-content:space-between;margin-top:5px;font-size:.7rem;color:var(--text-muted)}
.tenure-buttons{display:flex;gap:10px;margin-top:15px;flex-wrap:wrap}
.tenure-btn{padding:8px 16px;background:var(--bg-body);border:1px solid var(--border);border-radius:30px;font-size:.8rem;font-weight:600;color:var(--text-secondary);cursor:pointer}
.tenure-btn.active{background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;border:none}
.total-amount-card{background:linear-gradient(135deg,var(--primary),var(--secondary));border-radius:24px;padding:1.5rem;text-align:center;color:#fff;margin-bottom:1.5rem}
.total-amount-label{font-size:.75rem;opacity:.8}
.total-amount-value{font-size:2rem;font-weight:800;margin:.5rem 0}
.emi-card{background:var(--bg-body);border-radius:20px;padding:1.5rem;text-align:center;border:1px solid var(--border);margin-bottom:1.5rem}
.emi-label{font-size:.75rem;color:var(--text-secondary)}
.emi-value{font-size:1.8rem;font-weight:800;color:var(--primary);margin:.5rem 0}
.split-section{background:var(--bg-body);border-radius:20px;padding:1rem;border:1px solid var(--border)}
.split-item{display:flex;justify-content:space-between;padding:12px 0}
.split-item:first-child{border-bottom:1px solid var(--border)}
.split-value.principal{color:var(--primary)}
.split-value.interest{color:#f59e0b}

/* ========== SIP & FD CALCULATORS ========== */
.sip-container,.fd-container,.tax-container{max-width:800px;margin:0 auto;background:var(--bg-card);border-radius:var(--radius);padding:2rem;box-shadow:var(--shadow-lg)}
.input-group{margin-bottom:1.5rem}
.input-group label{display:block;margin-bottom:.5rem;font-weight:600;color:var(--text-secondary)}
.input-group input,.input-group select{width:100%;padding:.9rem;border:1px solid var(--border);border-radius:.75rem;background:var(--bg-body);color:var(--text-primary)}
.input-row{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.calculate-btn{width:100%;padding:.9rem;background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;border:none;border-radius:.75rem;cursor:pointer;font-size:1.1rem;font-weight:600}
.result-box{margin-top:2rem;padding:1.5rem;background:var(--bg-body);border-radius:var(--radius-sm);border-left:4px solid var(--primary)}
.result-item{display:flex;justify-content:space-between;margin-bottom:.8rem;padding:.5rem 0;flex-wrap:wrap}
.total-value{font-size:1.3rem;font-weight:700;color:var(--primary);margin-top:.5rem;padding-top:.8rem;border-top:2px solid var(--border)}

/* ========== BACK TO TOP ========== */
#topBtn{position:fixed;bottom:20px;right:20px;padding:12px 18px;border:none;border-radius:50%;cursor:pointer;background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;display:none;z-index:999;font-size:1.2rem;transition:var(--transition);box-shadow:var(--shadow-md)}
#topBtn:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}

/* ========== RESPONSIVE DESIGN ========== */
@media (max-width:768px){
body{font-size:14px}
h1{font-size:1.8rem}
h2{font-size:1.5rem}
.header{padding:.8rem 4%}
.menu-toggle{display:block}
.nav-links{position:fixed;top:0;right:-100%;width:70%;max-width:280px;height:100vh;background:var(--bg-header);flex-direction:column;justify-content:center;gap:2rem;transition:right .3s ease-in-out;box-shadow:var(--shadow-lg);z-index:1000;padding:2rem;border-left:1px solid var(--border)}
.nav-links.active{right:0}
.nav-links li a{font-size:1.2rem}
.menu-toggle.active span:nth-child(1){transform:rotate(45deg) translate(8px,6px)}
.menu-toggle.active span:nth-child(2){opacity:0}
.menu-toggle.active span:nth-child(3){transform:rotate(-45deg) translate(7px,-5px)}
.category-grid{grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:1rem}
.card{padding:1.5rem 1rem}
.stats{gap:1rem;padding:2rem 4%}
.stat-box{min-width:140px;padding:1rem}
.stat-box h3{font-size:1.8rem}
.footer-content{gap:1.5rem}
.main-container{padding:1rem 4%}
.buttons{gap:.5rem}
.calc-btn{padding:.75rem;font-size:1rem}
#expression{font-size:1.5rem}
.emi-two-columns{flex-direction:column}
.total-amount-value{font-size:1.5rem}
.emi-value{font-size:1.4rem}
.input-row{grid-template-columns:1fr}
.sip-container,.fd-container,.tax-container{padding:1rem}
}

@media (max-width:550px){
.fn-grid .calc-btn{font-size:.65rem}
}

@media (max-width:480px){
.logo{font-size:1.4rem}
#darkModeBtn{padding:.4rem .8rem;font-size:.8rem}
.category-grid{grid-template-columns:1fr 1fr}
.footer-content{grid-template-columns:1fr;text-align:center}
.footer-column a{display:inline-block;margin:0 .5rem}
.tenure-btn{padding:6px 12px;font-size:.7rem}
.total-amount-value{font-size:1.2rem}
.emi-value{font-size:1.1rem}
}

@media (max-width:380px){
.tenure-buttons{justify-content:center}
}

/* ========== LOGO IMAGES ========== */
.logo img{height:40px;width:auto;max-height:40px;object-fit:contain}
@media (max-width:768px){.logo img{height:32px;max-height:32px}}
@media (max-width:480px){.logo img{height:28px;max-height:28px}}
.footer-column img{max-width:100%;height:auto}
@media (max-width:480px){.footer-column img{max-width:150px;margin:0 auto;display:block}}

/* ========== SCROLLBAR ========== */
::-webkit-scrollbar{width:8px;height:8px}
::-webkit-scrollbar-track{background:var(--border);border-radius:4px}
::-webkit-scrollbar-thumb{background:var(--primary);border-radius:4px}
::-webkit-scrollbar-thumb:hover{background:var(--secondary)}

/* ========== UTILITIES ========== */
.text-center{text-align:center}
.mt-2{margin-top:.5rem}
.mt-4{margin-top:1rem}
.mb-2{margin-bottom:.5rem}
.mb-4{margin-bottom:1rem}
.hidden{display:none}

/* ========== PRINT STYLES ========== */
@media print{
.header,.footer,#darkModeBtn,.menu-toggle,.stats,.get-funds-btn{display:none}
body{background:#fff;color:#000}
.card,.result-box,.total-amount-card,.emi-card{box-shadow:none;border:1px solid #ddd}
}