:root {
    --navy: #002B5C;
    --teal: #008080;
    --white: #FFFFFF;
    --light-grey: #F8FAFC;
    --border: #E2E8F0;
    --font-head: 'Montserrat', sans-serif;
    --font-body: 'Open Sans', sans-serif;
}

* { box-sizing: border-box; }
body { margin: 0; font-family: var(--font-body); background: var(--white); color: var(--navy); }

/* Navbar */
.navbar { padding: 1rem 5%; border-bottom: 1px solid var(--border); position: sticky; top: 0; background: white; z-index: 100; }
.nav-container { display: flex; justify-content: space-between; align-items: center; max-width: 1200px; margin: 0 auto; }
.nav-logo { height: 45px; }
.nav-menu { list-style: none; display: flex; align-items: center; gap: 2rem; }
.nav-menu a { text-decoration: none; color: var(--navy); font-weight: 600; font-size: 0.9rem; transition: 0.3s; }
.nav-menu a:hover { color: var(--teal); }

/* Hero */
.hero { padding: 6rem 5%; background: var(--light-grey); text-align: center; }
.hero-content { max-width: 800px; margin: 0 auto; }
.badge { background: var(--navy); color: white; padding: 5px 15px; border-radius: 20px; font-size: 0.7rem; letter-spacing: 1px; font-weight: 600; }
.hero h1 { font-family: var(--font-head); font-size: 3rem; margin: 1.5rem 0; }
.text-teal { color: var(--teal); }
.hero p { font-size: 1.2rem; color: #475569; margin-bottom: 2rem; }

/* Tool Section */
.tool-section { padding: 5rem 5%; max-width: 1200px; margin: 0 auto; }
.section-header { text-align: center; margin-bottom: 3rem; }
.tool-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: center; }

.calc-container { background: white; border: 1px solid var(--border); padding: 2.5rem; border-radius: 12px; box-shadow: 0 10px 30px rgba(0,0,0,0.05); }
.input-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-bottom: 1.5rem; }
label { display: block; font-weight: 600; font-size: 0.8rem; margin-bottom: 0.5rem; }
input { width: 100%; padding: 12px; border: 1px solid var(--border); border-radius: 6px; font-size: 1rem; }

.btn-action { width: 100%; background: var(--teal); color: white; border: none; padding: 1.2rem; border-radius: 6px; font-family: var(--font-head); font-weight: 600; cursor: pointer; transition: 0.3s; }
.btn-action:hover { background: var(--navy); transform: translateY(-2px); }

/* Footer */
.footer { background: var(--navy); color: white; padding: 4rem 5% 2rem; margin-top: 5rem; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 4rem; max-width: 1200px; margin: 0 auto; }
.footer-logo { height: 40px; filter: brightness(0) invert(1); margin-bottom: 1rem; }
.footer h4 { color: var(--teal); margin-bottom: 1.5rem; }
.footer ul { list-style: none; padding: 0; }
.footer li { margin-bottom: 0.8rem; font-size: 0.9rem; opacity: 0.8; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); margin-top: 4rem; padding-top: 2rem; text-align: center; font-size: 0.8rem; opacity: 0.6; }

/* Responsive */
@media (max-width: 768px) {
    .tool-grid { grid-template-columns: 1fr; }
    .hero h1 { font-size: 2.2rem; }
    .footer-grid { grid-template-columns: 1fr; }
}