/* Global variables */
:root {
    --primary: #007bff;
    --primary-hover: #0056b3;
    --text: #333;
    --muted: #555;
    --bg-from: #f7f9fc;
    --bg-to: #eef2f7;
}

/* Base */
body {
    font-family: Arial, sans-serif;
    background: linear-gradient(180deg, var(--bg-from), var(--bg-to));
    color: var(--text);
    margin: 0;
    padding: 0;
}

/* Header & Nav */
.site-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 24px 16px 0;
}
.site-header .logo {
    width: 100px;
    max-width: 80vw;
    height: auto;
    display: block;
    filter: drop-shadow(0 1px 2px rgba(0,0,0,0.1));
}

.nav {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
    margin: 12px 0 8px;
}
.nav a {
    color: var(--primary);
    text-decoration: none;
    padding: 6px 10px;
    border-radius: 6px;
    transition: background-color .15s ease, color .15s ease;
}
.nav a:hover {
    background-color: rgba(0,123,255,0.08);
    color: var(--primary-hover);
}

/* Layout */
.container {
    max-width: 800px;
    margin: 32px auto 50px;
    background-color: #fff;
    padding: 24px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    border-radius: 12px;
}

/* Typography */
h1 { font-size: 2em; margin: 0 0 10px; color: #333; }
.muted { color: #777; margin-top: 0; }
h2 { margin-top: 28px; font-size: 1.3em; }
p, li { line-height: 1.7; color: var(--muted); }
ul { padding-left: 20px; }

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; color: var(--primary-hover); }

/* Buttons */
.btn {
    display: inline-block;
    margin-top: 20px;
    padding: 10px 20px;
    background-color: var(--primary);
    color: #fff;
    text-decoration: none;
    border-radius: 8px;
    font-size: 1em;
    transition: background-color .15s ease;
}
.btn:hover { background-color: var(--primary-hover); }

.back {
    display: inline-block;
    margin-top: 16px;
    padding: 10px 16px;
    background-color: var(--primary);
    color: #fff;
    text-decoration: none;
    border-radius: 8px;
    transition: background-color .15s ease;
}
.back:hover { background-color: var(--primary-hover); }

/* Footer */
footer {
    margin: 16px auto 40px;
    text-align: center;
    font-size: 0.9em;
    color: #aaa;
}
footer a {
    display: inline;
    margin: 0 6px;
    padding: 0;
    background: none;
    color: var(--primary);
    border-radius: 0;
    font-size: 0.95em;
    text-decoration: none;
}
footer a:hover { text-decoration: underline; background: none; color: var(--primary-hover); }

.text-center {
    text-align: center;
}