:root {
    --brand-primary: #072e33;
    --brand-secondary: #0b4a52;
    --brand-accent: #1de0b0;
    --text-dark: #0f172a;
    --text-body: #475569;
    --bg-light: #f8fafc;
    --white: #ffffff;
}

/* General Reset & Typography */
body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-light);
    color: var(--text-body);
    line-height: 1.6;
    overflow-x: hidden;
}

h1,
h2,
h3,
h4 {
    font-family: 'Poppins', sans-serif;
    color: var(--text-dark);
    margin-bottom: 0.5em;
    line-height: 1.2;
}

/* 1. Hero Section */
.hero-section {
    position: relative;
    background: linear-gradient(135deg, var(--brand-primary), var(--brand-secondary));
    padding: 100px 20px 80px;
    color: var(--white);
    text-align: center;
    overflow: hidden;
}

.hero-section::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url("https://images.unsplash.com/photo-1522071820081-009f0129c71c?q=80&w=2070&auto=format&fit=crop");
    background-size: cover;
    background-position: center;
    opacity: 0.1;
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 900px;
    margin: 0 auto;
}

.hero-content h1 {
    font-size: clamp(2.5rem, 5vw, 3.8rem);
    color: var(--white);
    margin-bottom: 24px;
}

.hero-subheading {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--brand-accent);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 16px;
    display: block;
}

.hero-text {
    font-size: 1.125rem;
    color: #e2e8f0;
    max-width: 700px;
    margin: 0 auto 32px;
}

/* 2. Challenge Grid (The Problems) */
.section-wrapper {
    padding: 80px 6%;
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-title h2 {
    font-size: 2.5rem;
}

.grid-3-col {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.challenge-card {
    background: var(--white);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.challenge-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.card-img-wrapper {
    height: 220px;
    overflow: hidden;
}

.card-img-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.challenge-card:hover .card-img-wrapper img {
    transform: scale(1.05);
}

.card-body {
    padding: 24px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.card-body h3 {
    font-size: 1.5rem;
    margin-bottom: 12px;
}

.card-body p {
    color: var(--text-body);
    font-size: 1rem;
}

/* 3. CTA Section */
.cta-full-width {
    background: var(--brand-accent);
    padding: 60px 20px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-content {
    position: relative;
    z-index: 1;
}

.cta-content h2 {
    color: var(--brand-primary);
    font-size: 2.2rem;
    margin-bottom: 16px;
}

.cta-content p {
    color: var(--brand-primary);
    font-size: 1.2rem;
    margin-bottom: 30px;
    font-weight: 500;
}

.btn-primary-dark {
    display: inline-block;
    background-color: var(--brand-primary);
    color: var(--white);
    padding: 16px 36px;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(7, 46, 51, 0.2);
}

.btn-primary-dark:hover {
    background-color: var(--white);
    color: var(--brand-primary);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(7, 46, 51, 0.3);
}

/* 4. Solution Section (What We're Building) */
.solution-section {
    background-color: var(--white);
    padding: 80px 6%;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.feature-box {
    background: var(--bg-light);
    padding: 32px;
    border-radius: 12px;
    border: 1px solid rgba(0, 0, 0, 0.05);
    text-align: center;
    transition: all 0.3s ease;
}

.feature-box:hover {
    border-color: var(--brand-accent);
    background: #f0fdf9;
    /* Light hint of accent color */
}

.feature-icon-wrapper {
    width: 70px;
    height: 70px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--white);
    border-radius: 50%;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.06);
}

.feature-icon-wrapper i {
    font-size: 1.8rem;
    color: var(--brand-accent);
}

.feature-box h4 {
    font-size: 1.35rem;
    margin-bottom: 12px;
}

.feature-box p {
    font-size: 1rem;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-section {
        padding-top: 60px;
    }

    .grid-3-col {
        grid-template-columns: 1fr;
    }
}