/* =========================
   RESET
========================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* =========================
   BODY
========================= */
body {
    font-family: 'Segoe UI', Arial, sans-serif;
    background: #f4f6f9;
    color: #333;
    line-height: 1.6;
}

/* =========================
   HEADER & NAVIGATION
========================= */
header {
    background: #1f2d3d;
    padding: 15px 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

nav {
    max-width: 1000px;
    margin: auto;
    display: flex;
    justify-content: center;
    gap: 40px;
}

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

nav a:hover {
    color: #00bcd4;
}

/* =========================
   MAIN CONTAINER
========================= */
main {
    max-width: 1000px;
    margin: 40px auto;
    padding: 30px;
    background: #ffffff;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

/* =========================
   HEADINGS
========================= */
h1 {
    font-size: 28px;
    margin-bottom: 15px;
    color: #1f2d3d;
    border-left: 5px solid #00bcd4;
    padding-left: 10px;
}

h2 {
    margin-top: 35px;
    margin-bottom: 15px;
    font-size: 22px;
    color: #2c3e50;
    border-left: 5px solid #00bcd4;
    padding-left: 10px;
}

h3 {
    margin-top: 20px;
    margin-bottom: 10px;
}

/* =========================
   TEXT & LISTS
========================= */
p {
    margin-bottom: 15px;
}

ul, ol {
    margin-left: 25px;
    margin-bottom: 15px;
}

/* =========================
   TABLE (Modern Look)
========================= */
.tablewrapper{
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
    min-width: 600px;
}

th {
    background: #1f2d3d;
    color: white;
    padding: 12px;
    text-align: left;
}

td {
    padding: 10px;
    border-bottom: 1px solid #ddd;
}

tr:hover {
    background-color: #f1f1f1;
}

/* =========================
   BUTTON
========================= */
button {
    padding: 10px 18px;
    background: #00bcd4;
    border: none;
    color: white;
    font-weight: 600;
    border-radius: 5px;
    cursor: pointer;
    transition: 0.3s ease;
}

button:hover {
    background: #0097a7;
}

/* =========================
   ASIDE
========================= */
aside {
    max-width: 1000px;
    margin: 20px auto;
    padding: 20px;
    background: #ffffff;
    border-radius: 6px;
}

/* =========================
   IFRAME
========================= */
iframe {
    width: 100%;
    max-width: 600px;
    height: 320px;
    border-radius: 6px;
}

/* =========================
   FOOTER
========================= */
footer {
    text-align: center;
    padding: 20px;
    margin-top: 40px;
    background: #1f2d3d;
    color: white;
}

/* Mobile */
@media (max-width: 480px) {

    body {
        font-size: 14px;
    }

    h1 {
        font-size: 22px;
    }

    h2 {
        font-size: 18px;
    }

    main {
        padding: 15px;
    }

    iframe {
        height: 200px;
    }

    nav {
        flex-direction: column;
        align-items: center;
        gap: 10px;
    }

    nav a {
        width: 80%;          /* make links full width for easier tapping */
        text-align: center;
        padding: 10px 0;
    }
}