/* === Reset & Base === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #ffffff;
    color: #333333;
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* === Header === */
.header {
    background-color: #ffffff;
    padding: 15px 20px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    transition: background-color 0.3s ease;
}

.header.scrolled {
    background-color: #f5f5f5;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.header h1 {
    margin: 0;
    color: #000000;
    font-size: 1.5em;
    flex-shrink: 0;
}

.logo {
    height: 40px;
    vertical-align: middle;
}

/* === Navigation === */
.nav-links {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
}

.nav-links a {
    color: #000000;
    text-decoration: none;
    margin: 0 15px;
    padding: 5px 10px;
    font-size: 0.95em;
    font-weight: 500;
    transition: color 0.3s ease, background-color 0.3s ease;
}

.nav-links a:hover,
.nav-links a:focus {
    color: #000000;
    background-color: rgba(204, 0, 0, 0.1);
    border-radius: 4px;
    outline: none;
}

/* === Content === */
.content {
    margin-top: 80px;
    padding: 20px;
    flex: 1 0 auto;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.content h1 {
    color: #222222;
    margin-bottom: 20px;
    font-size: 1.8em;
}

.category-list,
.accord-list {
    list-style: none;
    padding: 0;
}

.category-list li,
.accord-list li {
    padding: 15px;
    background-color: #f9f9f9;
    margin-bottom: 15px;
    border-left: 4px solid #000000;
    border-radius: 4px;
    transition: transform 0.2s ease, background-color 0.2s ease;
}

.category-list li:hover,
.accord-list li:hover {
    transform: translateX(5px);
    background-color: #f0f0f0;
}

.category-list a,
.accord-list a {
    color: #000000;
    text-decoration: none;
    font-size: 1.1em;
}

.category-list a:hover,
.accord-list a:hover {
    text-decoration: underline;
}

.category h2 {
    color: #000000;
    padding-bottom: 5px;
    margin-bottom: 15px;
    font-size: 1.5em;
}

/* === Footer === */
.footer {
    background-color: #ffffff;
    padding: 20px;
    text-align: center;
    box-shadow: 0 -2px 5px rgba(0, 0, 0, 0.05);
    width: 100%;
    margin-top: auto;
}

.footer h3 {
    color: #000000;
    margin: 0 0 10px;
    font-size: 1.2em;
}

.footer ul {
    list-style: none;
    padding: 0;
    margin: 0 0 15px;
}

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

.footer ul li a {
    color: #000000;
    text-decoration: none;
    font-size: 0.9em;
    transition: color 0.3s ease;
    font-weight: 500;
}

.footer ul li a:hover {
    color: #000000;
    text-decoration: underline;
}

.footer p {
    margin: 0;
    font-size: 0.8em;
    color: #666;
}

/* === Form (Login) === */
.form-container {
    background-color: #ffffff;
    padding: 30px 25px;
    border-radius: 10px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
    width: 100%;
    max-width: 400px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.form-container h2 {
    text-align: center;
    margin-bottom: 10px;
    color: #222;
}

.form-container input {
    padding: 12px;
    border: 1px solid #ccc;
    border-radius: 5px;
    font-size: 1em;
}

.form-container button {
    padding: 12px;
    background-color: #000000;
    color: white;
    font-size: 1em;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.form-container button:hover {
    background-color: #000000;
}

.form-container .error,
.form-container .success {
    font-size: 0.9em;
    padding: 10px;
    border-radius: 5px;
}

.form-container .error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.form-container .success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

/* === Accessibility === */
:focus:not(:focus-visible) {
    outline: none;
}


/* === Responsive Design === */
@media (max-width: 600px) {
    .header {
        padding: 10px;
        flex-direction: column;
    }

    .header h1 {
        margin-bottom: 10px;
    }

    .nav-links,
    .nav-links a {
        display: block;
        width: 100%;
        text-align: center;
        margin: 5px 0;
    }

    .nav-links a {
        padding: 10px;
    }

    .content {
        margin-top: 120px;
        padding: 15px;
    }

    .category-list li,
    .accord-list li {
        padding: 10px;
    }

    .footer {
        padding: 15px;
    }

    .footer ul li {
        display: block;
        margin: 5px 0;
    }

    .footer p {
        font-size: 0.75em;
    }
}

html {
    overflow-y: scroll;
}