/* Variables */
:root {
    --primary: #002147;      /* Deep Ocean Blue */
    --secondary: #71797E;    /* Steel Grey */
    --accent: #FF5E00;       /* Safety Orange */
    --light: #F4F4F4;        /* Drafting Paper White */
    --dark: #1a1a1a;
    --font-head: 'Montserrat', sans-serif;
    --font-body: 'Open Sans', sans-serif;
}

/* General Reset */
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: var(--font-body);
    background-color: var(--light);
    color: var(--dark);
    line-height: 1.6;
}

.container {
    width: 90%;
    max-width: 1100px;
    margin: 0 auto;
}

/* Navigation */
.navbar {
    background-color: var(--primary);
    color: white;
    padding: 1rem 0;
}
.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo {
    font-family: var(--font-head);
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
    text-decoration: none;
}
.dot { color: var(--accent); }
.nav-links { list-style: none; display: flex; gap: 20px; }
.nav-links a { color: #ccc; text-decoration: none; font-weight: 600; }
.nav-links a:hover, .nav-links a.active { color: var(--accent); }

/* Hero */
.hero {
    background: linear-gradient(rgba(0,33,71,0.9), rgba(0,33,71,0.8)), url('https://source.unsplash.com/1600x900/?shipyard,ship');
    background-size: cover;
    color: white;
    text-align: center;
    padding: 5rem 0;
}
.hero h1 { font-family: var(--font-head); font-size: 3rem; margin-bottom: 1rem; }

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 25px;
    text-decoration: none;
    border-radius: 4px;
    font-weight: 600;
    cursor: pointer;
    border: none;
}
.btn-primary { background-color: var(--accent); color: white; }
.btn-primary:hover { background-color: #e05200; }
.btn-secondary { background-color: var(--primary); color: white; margin-top: 15px;}

/* Features */
.features { padding: 3rem 0; }
.features .container { display: flex; gap: 20px; flex-wrap: wrap; }
.feature-card {
    flex: 1;
    background: white;
    padding: 20px;
    border-top: 4px solid var(--accent);
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

/* Tools Page Styling */
.main-content { padding: 2rem 0; }
.tool-card {
    background: white;
    padding: 25px;
    margin-bottom: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    border: 1px solid #ddd;
}
.tool-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 15px; }
.badge { background: #eee; padding: 4px 8px; font-size: 0.8rem; border-radius: 4px; font-weight: bold; }

.calc-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    margin-top: 15px;
}
.input-group label { display: block; font-weight: 600; margin-bottom: 5px; font-size: 0.9rem; }
.input-group input {
    width: 100%;
    padding: 8px;
    border: 1px solid #ccc;
    border-radius: 4px;
}
.full-width { grid-column: 1 / -1; }

.result-box {
    margin-top: 15px;
    padding: 15px;
    background-color: #eef2f5;
    border-left: 5px solid var(--primary);
    font-family: 'Courier New', monospace;
    font-weight: bold;
}

/* Footer */
footer { background: var(--dark); color: #777; text-align: center; padding: 2rem 0; margin-top: auto;}