body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background-color: #f5f7fa;
    color: #333;
    transition: 0.3s;
}

/* Dark mode */
body.dark {
    background-color: #1a1a1a;
    color: #e6e6e6;
}
body.dark .nav, body.dark footer {
    background-color: #000;
}
body.dark .card {
    background-color: #222;
    color: #fff;
}

/* Navigation */
.nav {
    background: #0b4f75;
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: white;
}
.nav-left {
    display: flex;
    align-items: center;
    gap: 10px;
}
.logo-box {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    background: #00a651;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 18px;
}
.nav a {
    color: white;
    margin: 0 10px;
    text-decoration: none;
    font-weight: bold;
}
.toggle-btn {
    background: white;
    color: #0b4f75;
    padding: 8px 15px;
    border-radius: 6px;
    cursor: pointer;
    border: none;
}

/* Sections */
.hero {
    background: linear-gradient(135deg, #0e6f9f, #0b4f75);
    color: white;
    padding: 80px 20px;
    text-align: center;
}
.hero img {
    width: 200px;
    border-radius: 10px;
    margin-top: 20px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}
.section {
    padding: 60px 20px;
    max-width: 1100px;
    margin: auto;
}
.section h1, .section h2 {
    text-align: center;
    color: #0b4f75;
}
.grid {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
}
.card {
    background: white;
    padding: 25px;
    width: 300px;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    text-align: center;
}
.card h3 {
    color: #0e6f9f;
}

/* Buttons */
.btn-primary {
    background: #0e6f9f;
    color: white;
    padding: 12px 25px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
}
.btn-outline {
    background: white;
    color: #0e6f9f;
    padding: 10px 20px;
    border-radius: 6px;
    border: 2px solid #0e6f9f;
    cursor: pointer;
    text-decoration: none;
}

/* Forms */
form {
    max-width: 600px;
    margin: auto;
}
input, textarea {
    width: 100%;
    padding: 12px;
    margin: 10px 0;
    border-radius: 6px;
    border: 1px solid #ccc;
}
.submit-btn {
    background: #0e6f9f;
    color: white;
    padding: 15px 30px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    width: 100%;
}

/* Footer */
footer {
    background: #0b4f75;
    color: white;
    text-align: center;
    padding: 20px;
    margin-top: 40px;
}

/* Floating WhatsApp */
.whatsapp-float {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: #25D366;
    color: white;
    width: 55px;
    height: 55px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    text-decoration: none;
    box-shadow: 0 4px 10px rgba(0,0,0,0.3);
}