/* Reset and base styles */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Arial, sans-serif;
    color: #222;
    background: #f8f9fa;
    margin: 0;
    line-height: 1.6;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

/* Header */
header {
    background: #233a5c;
    color: #fff;
    padding: 2rem 0 1rem 0;
    margin-bottom: 2rem;
}

header h1 {
    margin: 0;
    font-size: 2.5rem;
    letter-spacing: 1px;
}

.subtitle {
    font-size: 1.25rem;
    margin-top: 0.5rem;
    color: #e0e0e0;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 1rem 0 0 0;
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
}

nav a {
    color: #ffd700;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

nav a:hover,
nav a:focus {
    color: #fff;
    text-decoration: underline;
}

/* Headings */
h2 {
    font-size: 2rem;
    margin-top: 0;
    color: #222;
    border-bottom: 2px solid #ffd700;
    padding-bottom: 0.25rem;
}

h3 {
    font-size: 1.25rem;
    margin-top: 1.5rem;
    color: #444;
}

/* Sections */
section {
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    margin-bottom: 2rem;
    padding: 2rem 1rem;
}

ul {
    margin: 1rem 0;
    padding-left: 1.5rem;
}

li {
    margin-bottom: 0.5rem;
}

/* Links */
a {
    color: #0077cc;
    text-decoration: none;
    transition: color 0.2s;
}

a:hover,
a:focus {
    color: #005fa3;
    text-decoration: underline;
}

/* Buttons */
button,
input[type="submit"] {
    background: #ffd700;
    color: #222;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

button:hover,
button:focus {
    background: #e6c200;
}

/* Form styles */
form {
    margin-top: 1rem;
}

fieldset {
    border: 1px solid #ddd;
    border-radius: 6px;
    padding: 1rem;
    margin-bottom: 1rem;
}

legend {
    font-weight: bold;
    color: #222;
}

label {
    display: block;
    margin-top: 1rem;
    margin-bottom: 0.25rem;
    font-weight: 500;
}

input,
textarea {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #bbb;
    border-radius: 4px;
    font-size: 1rem;
    margin-bottom: 0.5rem;
    background: #f5f5f5;
    transition: border-color 0.2s;
}

input:focus,
textarea:focus {
    border-color: #0077cc;
    outline: none;
}

small {
    display: block;
    margin-bottom: 0.5rem;
    color: #666;
}

/* Aside (Quick Links) */
aside {
    background: #233a5c;
    color: #fff;
    padding: 2rem 0;
    margin-bottom: 2rem;
    border-radius: 8px;
}

aside h2 {
    color: #ffd700;
    border-bottom: none;
}

aside nav ul {
    gap: 1rem;
}

aside a {
    color: #ffd700;
}

aside a:hover,
aside a:focus {
    color: #fff;
}

/* Footer */
footer {
    background: #233a5c;
    color: #fff;
    text-align: center;
    padding: 1.5rem 0;
    border-radius: 0 0 8px 8px;
    font-size: 1rem;
}

/* Responsive */
@media (max-width: 600px) {
    .container {
        padding: 1rem 0.5rem;
    }
    nav ul {
        flex-direction: column;
        gap: 0.75rem;
    }
    section,
    aside {
        padding: 1rem 0.5rem;
    }
}