:root {
    --primary-color: #1DA1F2;
    --secondary-color: #FFAD1F;
    --background-color: #F5F8FA;
    --surface-color: #FFFFFF;
    --text-color: #14171A;
    --border-radius: 12px;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    padding-top: 56px; /* For fixed navbar */
}

.navbar {
    background-color: var(--surface-color) !important;
    box-shadow: 0 2px 4px rgba(0,0,0,.05);
}

.navbar-brand {
    font-weight: 700;
    color: var(--primary-color) !important;
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    border-radius: var(--border-radius);
    padding: 10px 24px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background-color: #1a91da;
    border-color: #1a91da;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(29, 161, 242, 0.2);
}

.hero-section {
    background: linear-gradient(45deg, #1DA1F2, #87CEEB);
    color: white;
    padding: 120px 0;
    text-align: center;
}

.hero-section h1 {
    font-weight: 700;
}

.hero-section .btn-primary {
    background-color: var(--surface-color);
    color: var(--primary-color);
    border: none;
}
.hero-section .btn-primary:hover {
    background-color: #eef;
    color: var(--primary-color);
}


#features .card {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 25px rgba(0,0,0,0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

#features .card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.12);
}

#features .icon {
    width: 48px;
    height: 48px;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.join-section {
    background-color: var(--surface-color) !important;
}

.join-section .form-control {
    border-radius: var(--border-radius);
    padding: 1rem;
}

.join-section .form-control:focus {
    box-shadow: 0 0 0 0.25rem rgba(29, 161, 242, 0.25);
    border-color: var(--primary-color);
}

footer {
    background-color: var(--surface-color);
}