/* ============================================
   MySIPCalc — Main CSS Design System
   Brand: MySIPCalc | mysipcalc.com
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ---- CSS Variables ---- */
:root {
  --primary:        #1A73E8;
  --primary-dark:   #1557b0;
  --primary-light:  #e8f0fe;
  --secondary:      #34A853;
  --secondary-light:#e6f4ea;
  --accent:         #FBBC04;
  --danger:         #EA4335;
  --bg:             #F8F9FA;
  --surface:        #FFFFFF;
  --text-primary:   #202124;
  --text-secondary: #5F6368;
  --border:         #E8EAED;
  --shadow-sm:      0 1px 3px rgba(0,0,0,.08),0 1px 2px rgba(0,0,0,.06);
  --shadow-md:      0 4px 12px rgba(0,0,0,.1);
  --shadow-lg:      0 10px 40px rgba(0,0,0,.12);
  --radius-sm:      6px;
  --radius-md:      12px;
  --radius-lg:      20px;
  --transition:     all .2s ease;
  --font:           'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

/* ---- Reset & Base ---- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font);
  font-size:16px;
  line-height:1.6;
  color:var(--text-primary);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
a{color:var(--primary);text-decoration:none;transition:var(--transition)}
a:hover{color:var(--primary-dark)}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
button{cursor:pointer;font-family:var(--font)}

/* ---- Layout ---- */
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.container-sm{max-width:860px;margin:0 auto;padding:0 20px}

/* ---- Typography ---- */
h1{font-size:clamp(26px,4vw,36px);font-weight:700;line-height:1.25;color:var(--text-primary)}
h2{font-size:clamp(20px,3vw,26px);font-weight:600;line-height:1.3;color:var(--text-primary)}
h3{font-size:18px;font-weight:600;color:var(--text-primary)}
h4{font-size:15px;font-weight:600;color:var(--text-primary)}
p{color:var(--text-secondary);line-height:1.75}
.text-sm{font-size:13px}
.text-muted{color:var(--text-secondary)}

/* ---- Header / Navbar ---- */
.site-header{
  background:var(--surface);
  border-bottom:1px solid var(--border);
  position:sticky;
  top:0;
  z-index:1000;
  box-shadow:var(--shadow-sm);
}
.nav-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  height:64px;
  gap:24px;
}
.logo{
  display:flex;
  align-items:center;
  gap:8px;
  font-size:20px;
  font-weight:800;
  color:var(--text-primary);
  white-space:nowrap;
}
.logo-icon{
  width:34px;height:34px;
  background:var(--primary);
  border-radius:8px;
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-size:16px;font-weight:800;
}
.logo span{color:var(--primary)}
.nav-links{display:flex;align-items:center;gap:4px}
.nav-links a{
  padding:8px 14px;
  border-radius:var(--radius-sm);
  font-size:14px;
  font-weight:500;
  color:var(--text-secondary);
  transition:var(--transition);
}
.nav-links a:hover,.nav-links a.active{
  color:var(--primary);
  background:var(--primary-light);
}
.nav-dropdown{position:relative}
.nav-dropdown-toggle{
  display:flex;align-items:center;gap:4px;
  padding:8px 14px;
  border-radius:var(--radius-sm);
  font-size:14px;font-weight:500;
  color:var(--text-secondary);
  background:none;border:none;
  transition:var(--transition);
}
.nav-dropdown-toggle:hover{color:var(--primary);background:var(--primary-light)}
.nav-dropdown-menu{
  position:absolute;top:calc(100% + 8px);left:0;
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius-md);
  box-shadow:var(--shadow-lg);
  padding:8px;
  min-width:220px;
  opacity:0;visibility:hidden;
  transform:translateY(-8px);
  transition:var(--transition);
  z-index:200;
}
.nav-dropdown:hover .nav-dropdown-menu{
  opacity:1;visibility:visible;transform:translateY(0);
}
.nav-dropdown-menu a{
  display:flex;align-items:center;gap:12px;
  padding:10px 12px;
  border-radius:var(--radius-sm);
  font-size:14px;color:var(--text-primary);
}
.nav-dropdown-menu a svg{flex-shrink:0}
.nav-dropdown-menu a:hover{background:var(--bg);color:var(--primary)}
.nav-cta{
  background:var(--primary);color:#fff!important;
  padding:9px 18px!important;
  border-radius:var(--radius-sm)!important;
  font-weight:600!important;
  font-size:14px!important;
}
.nav-cta:hover{background:var(--primary-dark)!important;color:#fff!important}
.hamburger{display:none;flex-direction:column;gap:5px;background:none;border:none;padding:4px}
.hamburger span{display:block;width:22px;height:2px;background:var(--text-primary);border-radius:2px;transition:var(--transition)}

/* ---- Hero ---- */
.hero{
  background:linear-gradient(135deg,#1a73e8 0%,#0d47a1 60%,#1565c0 100%);
  color:#fff;
  padding:72px 0 64px;
  position:relative;
  overflow:hidden;
}
.hero::before{
  content:'';
  position:absolute;inset:0;
  background:url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E") repeat;
}
.hero-inner{
  position:relative;
  display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;
}
.hero-content h1{color:#fff;font-size:clamp(28px,4vw,42px);margin-bottom:16px}
.hero-content p{color:rgba(255,255,255,.85);font-size:18px;margin-bottom:32px;line-height:1.7}
.hero-badges{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:32px}
.hero-badge{
  background:rgba(255,255,255,.15);
  border:1px solid rgba(255,255,255,.25);
  color:#fff;
  padding:5px 14px;border-radius:20px;font-size:13px;font-weight:500;
  backdrop-filter:blur(4px);
}
.hero-btns{display:flex;gap:12px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:13px 24px;
  border-radius:var(--radius-sm);
  font-size:15px;font-weight:600;
  border:none;transition:var(--transition);
  cursor:pointer;
}
.btn-primary{background:#fff;color:var(--primary)}
.btn-primary:hover{background:#e8f0fe;color:var(--primary-dark);transform:translateY(-1px)}
.btn-outline-white{background:transparent;color:#fff;border:2px solid rgba(255,255,255,.5)}
.btn-outline-white:hover{background:rgba(255,255,255,.1);border-color:#fff}
.btn-success{background:var(--secondary);color:#fff}
.btn-success:hover{background:#2d9248;transform:translateY(-1px);box-shadow:0 6px 20px rgba(52,168,83,.4)}
.btn-blue{background:var(--primary);color:#fff}
.btn-blue:hover{background:var(--primary-dark);transform:translateY(-1px);box-shadow:0 6px 20px rgba(26,115,232,.4)}
.btn-sm{padding:9px 18px;font-size:14px}
.btn-lg{padding:16px 32px;font-size:16px}

/* Mini quick-calc in hero */
.hero-calc{
  background:rgba(255,255,255,.12);
  border:1px solid rgba(255,255,255,.2);
  border-radius:var(--radius-lg);
  padding:28px;
  backdrop-filter:blur(10px);
}
.hero-calc h3{color:#fff;margin-bottom:20px;font-size:18px}
.hc-row{margin-bottom:16px}
.hc-label{color:rgba(255,255,255,.8);font-size:13px;font-weight:500;margin-bottom:6px;display:block}
.hc-input{
  width:100%;
  background:rgba(255,255,255,.15);
  border:1px solid rgba(255,255,255,.25);
  border-radius:var(--radius-sm);
  color:#fff;
  padding:10px 14px;
  font-size:15px;font-weight:600;
  font-family:var(--font);
  outline:none;
}
.hc-input:focus{border-color:rgba(255,255,255,.6);background:rgba(255,255,255,.2)}
.hc-input::placeholder{color:rgba(255,255,255,.5)}
.hc-results{
  background:rgba(255,255,255,.1);
  border-radius:var(--radius-sm);
  padding:16px;
  margin-top:16px;
  display:grid;grid-template-columns:1fr 1fr;gap:12px;
}
.hc-result-item .label{color:rgba(255,255,255,.7);font-size:12px;margin-bottom:2px}
.hc-result-item .value{color:#fff;font-size:18px;font-weight:700}
.hc-result-item .value.green{color:#69f0ae}

/* ---- Section ---- */
.section{padding:64px 0}
.section-alt{background:var(--surface)}
.section-title{text-align:center;margin-bottom:48px}
.section-title h2{margin-bottom:10px}
.section-title p{color:var(--text-secondary);max-width:540px;margin:0 auto}
.section-title .badge-tag{
  display:inline-block;
  background:var(--primary-light);
  color:var(--primary);
  padding:4px 14px;border-radius:20px;
  font-size:13px;font-weight:600;
  margin-bottom:12px;
}

/* ---- Tools Grid ---- */
.tools-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:20px;
}
.tool-card{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius-md);
  padding:24px 20px;
  transition:var(--transition);
  cursor:pointer;
  position:relative;
  overflow:hidden;
}
.tool-card::before{
  content:'';
  position:absolute;top:0;left:0;right:0;height:3px;
  background:var(--primary);
  transform:scaleX(0);transition:transform .3s ease;
}
.tool-card:hover{
  box-shadow:var(--shadow-lg);
  transform:translateY(-4px);
  border-color:var(--primary);
}
.tool-card:hover::before{transform:scaleX(1)}
.tool-icon{
  width:48px;height:48px;
  border-radius:12px;
  display:flex;align-items:center;justify-content:center;
  font-size:22px;
  margin-bottom:16px;
  transition:var(--transition);
}
.tool-card:hover .tool-icon{transform:scale(1.1)}
.tool-card h3{font-size:15px;margin-bottom:8px}
.tool-card p{font-size:13px;line-height:1.55;color:var(--text-secondary)}
.tool-badge{
  position:absolute;top:14px;right:14px;
  background:var(--secondary-light);
  color:var(--secondary);
  padding:3px 9px;border-radius:20px;
  font-size:11px;font-weight:600;
}
.tool-badge.hot{background:#fff3e0;color:#e65100}

/* ---- Trust signals ---- */
.trust-row{
  display:flex;align-items:center;justify-content:center;
  gap:36px;flex-wrap:wrap;
}
.trust-item{
  display:flex;align-items:center;gap:8px;
  font-size:14px;font-weight:500;color:var(--text-secondary);
}
.trust-item span:first-child{
  display:flex;align-items:center;justify-content:center;
}

/* ---- Blog Cards ---- */
.blog-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.blog-card{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius-md);
  overflow:hidden;
  transition:var(--transition);
}
.blog-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-3px)}
.blog-card-img{
  height:180px;
  background:linear-gradient(135deg,var(--primary-light),var(--primary));
  display:flex;align-items:center;justify-content:center;
  font-size:48px;
}
.blog-card-body{padding:20px}
.blog-meta{
  display:flex;align-items:center;gap:12px;
  font-size:12px;color:var(--text-secondary);margin-bottom:10px;
}
.blog-tag{
  background:var(--primary-light);
  color:var(--primary);
  padding:2px 10px;border-radius:20px;font-size:12px;font-weight:600;
}
.blog-card h3{font-size:16px;margin-bottom:8px;line-height:1.4}
.blog-card p{font-size:13px;color:var(--text-secondary);line-height:1.6}
.blog-read-more{
  display:inline-flex;align-items:center;gap:4px;
  margin-top:14px;font-size:13px;font-weight:600;color:var(--primary);
}

/* ---- Footer ---- */
.site-footer{
  background:#1a1f36;
  color:rgba(255,255,255,.7);
  padding:56px 0 0;
}
.footer-grid{
  display:grid;grid-template-columns:2fr 1fr 1fr 1fr;
  gap:40px;margin-bottom:40px;
}
.footer-brand .logo{color:#fff;font-size:18px}
.footer-brand p{font-size:14px;line-height:1.7;margin-top:12px;color:rgba(255,255,255,.5)}
.footer-col h4{color:#fff;font-size:13px;font-weight:700;text-transform:uppercase;letter-spacing:.08em;margin-bottom:16px}
.footer-col ul li{margin-bottom:10px}
.footer-col ul li a{font-size:14px;color:rgba(255,255,255,.55);transition:var(--transition)}
.footer-col ul li a:hover{color:#fff}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.08);
  padding:20px 0;
  display:flex;align-items:center;justify-content:space-between;
  flex-wrap:wrap;gap:12px;
}
.footer-bottom p{font-size:13px;color:rgba(255,255,255,.4)}
.footer-disclaimer{
  background:rgba(255,255,255,.04);
  border-top:1px solid rgba(255,255,255,.06);
  padding:14px 0;
}
.footer-disclaimer p{font-size:12px;color:rgba(255,255,255,.3);text-align:center;max-width:800px;margin:0 auto}

/* ---- Breadcrumb ---- */
.breadcrumb{
  display:flex;align-items:center;gap:6px;
  font-size:13px;color:var(--text-secondary);
  margin-bottom:20px;
  flex-wrap:wrap;
}
.breadcrumb a{color:var(--text-secondary)}
.breadcrumb a:hover{color:var(--primary)}
.breadcrumb .sep{color:var(--border)}

/* ---- Ads placeholders ---- */
.ad-leaderboard{
  background:var(--bg);
  border:1px dashed var(--border);
  border-radius:var(--radius-sm);
  height:90px;
  display:flex;align-items:center;justify-content:center;
  font-size:12px;color:var(--text-secondary);
  margin:24px 0;
  overflow:hidden;
}
.ad-rectangle{
  background:var(--bg);
  border:1px dashed var(--border);
  border-radius:var(--radius-sm);
  min-height:250px;
  display:flex;align-items:center;justify-content:center;
  font-size:12px;color:var(--text-secondary);
  overflow:hidden;
}

/* ---- Utility ---- */
.text-center{text-align:center}
.mt-8{margin-top:8px}
.mt-16{margin-top:16px}
.mt-24{margin-top:24px}
.mt-32{margin-top:32px}
.mt-48{margin-top:48px}
.mb-8{margin-bottom:8px}
.mb-16{margin-bottom:16px}
.mb-24{margin-bottom:24px}
.mb-32{margin-bottom:32px}
.gap-16{gap:16px}
.flex{display:flex}
.flex-center{display:flex;align-items:center;justify-content:center}
.flex-between{display:flex;align-items:center;justify-content:space-between}
.fw-600{font-weight:600}
.fw-700{font-weight:700}
.color-primary{color:var(--primary)}
.color-green{color:var(--secondary)}
.color-red{color:var(--danger)}

/* ---- Mobile Menu Base ---- */
.mobile-menu {
  display: none;
  position: fixed;
  inset: 64px 0 0;
  background: var(--surface);
  padding: 24px;
  z-index: 999;
  overflow-y: auto;
}
.mobile-menu.open {
  display: block;
}

/* ---- Sub-Navigation Bar (Calculator Switcher) ---- */
.sub-nav {
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  padding: 12px 0;
  overflow-x: auto;
  white-space: nowrap;
  -webkit-overflow-scrolling: touch;
  position: sticky;
  top: 64px;
  z-index: 900;
  scrollbar-width: none;
  box-shadow: 0 4px 12px rgba(0,0,0,0.03);
}
.sub-nav::-webkit-scrollbar { display: none; }

.sub-nav-inner {
  display: flex;
  align-items: center;
  gap: 12px;
}
.sub-nav-link {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: 12px;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  background: rgba(0, 0, 0, 0.02);
  border: 1px solid transparent;
}
.sub-nav-link:hover {
  color: var(--primary);
  background: var(--primary-light);
  transform: translateY(-1px);
}
.sub-nav-link.active {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 12px rgba(26, 115, 232, 0.25);
}
.sub-nav-link svg { 
  flex-shrink: 0;
  width: 16px;
  height: 16px;
}
.sub-nav-link.active svg {
  color: #fff;
}

/* ---- Responsive ---- */
@media(max-width:1024px){
  .tools-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .hero-inner{grid-template-columns:1fr}
  .hero-calc{display:none}
  .nav-links,.nav-cta{display:none}
  .hamburger{display:flex}
  .mobile-menu a{
    display:block;padding:14px 0;
    border-bottom:1px solid var(--border);
    font-size:16px;font-weight:500;color:var(--text-primary);
  }
  .blog-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;text-align:center}
  .trust-row{gap:20px}
  .section{padding:48px 0}
}
@media(max-width:480px){
  .tools-grid{grid-template-columns:1fr}
  .hero{padding:48px 0 40px}
  .hero-btns{flex-direction:column}
  .btn{width:100%;justify-content:center}
}