/* --- Global Styles & Variables --- */
:root {
    --primary-color: #4a90e2;
    --secondary-color: #50e3c2;
    --dark-color: #333;
    --light-color: #f4f4f4;
    --text-color: #555;
    --font-family: 'Poppins', sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: var(--font-family); line-height: 1.6; background-color: #fff; color: var(--text-color); }

/* --- Header & Navigation --- */
.navbar { display: flex; justify-content: space-between; align-items: center; padding: 1rem 5%; background: #fff; box-shadow: 0 2px 5px rgba(0,0,0,0.1); position: sticky; top: 0; z-index: 100; }
.logo { font-size: 1.5rem; font-weight: 700; color: var(--primary-color); }
.nav-links { list-style: none; display: flex; }
.nav-links li { padding: 0 1rem; }
.nav-links a { text-decoration: none; color: var(--dark-color); font-weight: 600; transition: color 0.3s ease; }
.nav-links a:hover, .nav-links a.active { color: var(--primary-color); }

/* --- Page Header --- */
.page-header { background: var(--primary-color); color: #fff; padding: 3rem 5%; text-align: center; }
.page-header h1 { font-size: 2.8rem; margin-bottom: 0.5rem; }
.page-header p { font-size: 1.1rem; opacity: 0.9; }

/* --- General Content Section --- */
.content-section { padding: 3rem 5%; }
.content-section h2 { text-align: center; font-size: 2.5rem; margin-bottom: 1rem; color: var(--dark-color); }
.content-section p { max-width: 800px; margin: 0 auto 2rem auto; text-align: center; }
.content-section.alternate-bg { background-color: var(--light-color); }

/* --- INTERACTIVE ROADMAP TABS --- */
.roadmap-tabs {
    display: flex;
    justify-content: center;
    margin-bottom: 2rem;
    border-bottom: 2px solid #eee;
}
.tab-link {
    padding: 1rem 2rem;
    cursor: pointer;
    background: none;
    border: none;
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-color);
    position: relative;
    transition: color 0.3s ease;
}
.tab-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--primary-color);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}
.tab-link.active { color: var(--primary-color); }
.tab-link.active::after { transform: scaleX(1); }

/* --- Roadmap Tab Content --- */
.roadmap-content { max-width: 800px; margin: auto; }
.tab-content { display: none; }
.tab-content.active { display: block; }
.tab-content h3 { font-size: 1.8rem; color: var(--dark-color); margin-bottom: 1.5rem; text-align: center; }
.tab-content ul {
    list-style: none;
    padding-left: 0;
}
.tab-content ul li {
    background: #f9f9f9;
    padding: 1rem 1.5rem;
    margin-bottom: 0.75rem;
    border-left: 4px solid var(--secondary-color);
    border-radius: 4px;
    font-size: 1.05rem;
}
.tab-content ul li::before {
    content: '✓';
    color: var(--secondary-color);
    font-weight: bold;
    margin-right: 10px;
}

/* --- Platform Cards Section --- */
.platform-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: auto;
}
.platform-card {
    background: #fff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.07);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.platform-card:hover { transform: translateY(-8px); box-shadow: 0 12px 25px rgba(0,0,0,0.1); }
.platform-card h3 { color: var(--primary-color); font-size: 1.5rem; margin-bottom: 0.5rem; }
.platform-card p { margin-bottom: 1.5rem; text-align: center; }
.cta-button.secondary {
    display: inline-block;
    background: var(--primary-color);
    color: #fff;
    padding: 0.8rem 1.5rem;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 600;
    transition: background-color 0.3s ease;
}
.cta-button.secondary:hover { background: #3a7bc8; }

/* --- Footer --- */
footer { background: var(--dark-color); color: #fff; text-align: center; padding: 2rem 5%; }