:root {
    --deep-green: #0f3d2e;
    --mineral-blue: #1f4e79;
    --slate-gray: #2f3e46;
    --metallic: #6c757d;
    --light-bg: #f4f6f7;
}

body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--light-bg);
    color: var(--slate-gray);
}

/* =========================
   HERO SECTION
========================= */
.hero-section {
    position: relative;
    background: linear-gradient(rgba(15, 61, 46, 0.75), rgba(15, 61, 46, 0.75)),
                url('assets/images/mineral-processing-plant.jpg') center center/cover no-repeat;
    height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    text-align: center;
}

.hero-section .container {
    position: relative;
    z-index: 2;
}

/* =========================
   SECTION TITLES
========================= */
.section-title {
    font-weight: 700;
    color: var(--deep-green);
}

/* =========================
   BUTTON STYLING
========================= */
.btn-primary {
    background-color: var(--mineral-blue);
    border: none;
}

.btn-primary:hover {
    background-color: var(--deep-green);
}

/* =========================
   NAVBAR STYLING
========================= */
.navbar {
    transition: all 0.3s ease;
    background-color: #ffffff !important;
}

.navbar .nav-link {
    font-weight: 500;
    color: #000 !important;
    transition: all 0.3s ease;
}

.navbar .nav-link:hover {
    color: var(--mineral-blue) !important;
}

/* Shadow effect after scroll */
.navbar.scrolled {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

/* =========================
   CORE STRENGTHS ENHANCED
========================= */

.core-card {
    border-radius: 12px;
    transition: all 0.3s ease;
    box-shadow: 0 8px 25px rgba(0,0,0,0.05);
    text-align: center;
}

.core-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.12);
}

/* Icon circle */
.icon-circle {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    font-size: 28px;
}

/* =========================
   Individual Column Colors
========================= */

/* Innovation */
.core-card.innovation {
    background: rgba(31, 78, 121, 0.12);
}
.core-card.innovation .icon-circle {
    background: var(--mineral-blue);
    color: #fff;
}

/* Precision */
.core-card.precision {
    background: rgba(47, 62, 70, 0.12);
}
.core-card.precision .icon-circle {
    background: var(--slate-gray);
    color: #fff;
}

/* Sustainability */
.core-card.sustainability {
    background: rgba(15, 61, 46, 0.12);
}
.core-card.sustainability .icon-circle {
    background: var(--deep-green);
    color: #fff;
}

/* Reliability */
.core-card.reliability {
    background: rgba(108, 117, 125, 0.12);
}
.core-card.reliability .icon-circle {
    background: var(--metallic);
    color: #fff;
}

/* Improve text contrast */
.core-card h5 {
    color: var(--deep-green);
}

.core-card p {
    color: var(--slate-gray);
}