/* =========================
   RESET
========================= */
* {
    margin: 0;
    padding: 0;
}

/* =========================
   BODY
========================= */
body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    background-color: #0f172a;   /* deep navy */
    color: #e2e8f0;              /* gray text */
}

/* =========================
   HEADER
========================= */
header {
    background-color: #1e293b;   /* dark slate */
    padding: 30px;
    text-align: center;
}

header h1 {
    font-size: 28px;
}

/* =========================
   NAVIGATION
========================= */
nav {
    background-color: #1e293b;
}

nav ul {
    list-style-type: none;
    text-align: center;
    padding: 12px;
}

nav ul li {
    display: inline;
    margin: 0 15px;
}

/* Contextual selector */
nav ul li a {
    color: #cbd5e1;
    text-decoration: none;
    font-weight: bold;
    padding: 6px 12px;
    border-radius: 4px;
}

/* Pseudo-class selector */
nav ul li a:hover {
    background-color: #334155;
    color: #facc15;  /* warm accent */
}

/* Active page indicator */
#active {
    border-bottom: 2px solid #facc15;
}

/* =========================
   MAIN CONTENT
========================= */
main {
    padding: 40px;
    margin: auto;
}

/* =========================
   LINKS
========================= */
a {
    color: #facc15;
}

a:hover {
    text-decoration: underline;
}

/* =========================
   FOOTER
========================= */
footer {
    background-color: #1e293b;
    text-align: center;
    padding: 20px;
    margin-top: 40px;
    font-size: 14px;
}

/* =========================
   LOGO
========================= */
.logo {
    width: 120px;
    height: auto;
    display: block;
    margin: 0 auto 10px auto;
}

/* =========================
   MEDIUM DEVICES
========================= */

@media (min-width: 590px) and (max-width: 789px) {
    main {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 20px;
    }

    .nav {
        flex-direction: row;
        justify-content: center;
    }
}

/* =========================
   LARGE DEVICES
========================= */

@media (min-width: 790px) {
    body {
        max-width: 790px;
        margin: auto;
    }

    main {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

/* =========================
   SKIP LINK (ACCESSIBILITY)
========================= */

.skip-link {
    position: absolute;
    left: -999px;
}

.skip-link:focus {
    left: 10px;
    top: 10px;
    background-color: #facc15;
    color: black;
    padding: 8px;
}

/* =========================
   KEYBOARD FOCUS STYLING
========================= */

a:focus,
input:focus,
textarea:focus,
select:focus {
    outline: 3px solid #facc15;
}