body {
    font-family: 'Segoe UI', Tahoma, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f9fafc;
    color: #333;
}


header {
    background: linear-gradient(135deg, #6a11cb, #2575fc);
    color: white;
    text-align: center;
    padding: 3rem 1rem;
}

h1 {
    margin: 0;
    font-size: 2.3rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

header h2 {
    margin-top: 1rem;
    font-weight: 400;
    color: rgba(255,255,255,0.9);
}


nav {
    background: white;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    padding: 1rem;
    position: sticky;
    top: 0;
}

nav ul {
    list-style: none;
    text-align: center;
    padding: 0;
    margin: 0;
}

nav li {
    display: inline-block;
    margin: 0 20px;
}

nav a {
    text-decoration: none;
    color: #444;
    font-weight: 600;
    transition: 0.3s;
}

nav a:hover {
    color: #2575fc;
}


main {
    width: 85%;
    margin: auto;
    padding: 2rem 0;
}


section, article {
    background: white;
    border-radius: 16px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 8px 25px rgba(0,0,0,0.05);
}

h2 {
    color: #2575fc;
    margin-bottom: 1rem;
}


#intro {
    font-style: italic;
    font-size: 1.1rem;
    color: #555;
}


ul, ol {
    padding-left: 1.5rem;
}

ul li, ol li {
    margin-bottom: 0.5rem;
}


.highlight {
    color: #2575fc;
    font-weight: bold;
}


a {
    color: #2575fc;
}

a:hover {
    text-decoration: underline;
}


img {
    max-width: 100%;
    border-radius: 12px;
    margin-top: 1rem;
}

figure {
    text-align: center;
}

figcaption {
    margin-top: 0.5rem;
    color: #666;
    font-style: italic;
}

blockquote {
    background: #eef2ff;
    border-left: 6px solid #2575fc;
    border-radius: 12px;
    margin: 1.5rem 0;
    padding: 1.2rem 1.4rem;
    color: #1f2937;
}

body.dark-mode blockquote {
    background: #1f2937;
    border-color: #60a5fa;
    color: #e5e7eb;
}

input[type="text"],
input[type="email"],
textarea {
    width: 100%;
    padding: 0.9rem;
    border: 1px solid #ddd;
    border-radius: 10px;
    margin-top: 0.5rem;
    margin-bottom: 1rem;
    font-size: 1rem;
}

input[type="submit"] {
    background: #2575fc;
    color: white;
    border: none;
    padding: 0.9rem 2rem;
    border-radius: 10px;
    cursor: pointer;
    font-size: 1rem;
    transition: 0.3s;
}

input[type="submit"]:hover {
    background: #1a5ed8;
}


footer {
    text-align: center;
    background: #111827;
    color: white;
    padding: 1rem;
    margin-top: 3rem;
}


#thankyou-message {
    text-align: center;
    font-size: 1.2rem;
}


@media (max-width: 768px) {
    nav li {
        display: block;
        margin: 10px 0;
    }

    main {
        width: 92%;
    }

    h1 {
        font-size: 1.8rem;
    }
}

#dark-mode-button {
    background: rgba(255, 255, 255, 0.15);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.35);
    border-radius: 10px;
    padding: 0.85rem 1.2rem;
    cursor: pointer;
    margin-top: 1rem;
    font-size: 0.95rem;
    transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

#dark-mode-button:hover {
    background: rgba(255, 255, 255, 0.25);
}

body.dark-mode {
    background-color: #0e1118;
    color: #e5e7eb;
}

body.dark-mode header {
    background: linear-gradient(135deg, #2d2d4f, #163a66);
}

body.dark-mode nav {
    background: #111827;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}

body.dark-mode nav a {
    color: #cbd5e1;
}

body.dark-mode nav a:hover {
    color: #93c5fd;
}

body.dark-mode section,
body.dark-mode article {
    background: #111827;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.45);
}

body.dark-mode footer {
    background: #0b1220;
    color: #cbd5e1;
}

body.dark-mode input[type="text"],
body.dark-mode input[type="email"],
body.dark-mode textarea {
    background: #111827;
    border-color: #374151;
    color: #e5e7eb;
}

body.dark-mode input[type="submit"] {
    background: #2563eb;
}

body.dark-mode a,
body.dark-mode figure figcaption {
    color: #93c5fd;
}