/* === LAYOUT UTAMA DENGAN SIDEBAR === */
:root {
    --primary-color: #1877f2;
    --accent-color: #f5a623;
    --sidebar-bg: #1e1e2f;
    --sidebar-text: #e0e0e0;
    --sidebar-active-bg: #383852;
    --sidebar-hover-bg: #2a2a4a;
    --content-bg: #f0f2f5;
    --card-bg: #ffffff;
    --text-color: #1c1e21;
    --subtle-text-color: #606770;
}
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--content-bg);
    color: var(--text-color);
    margin: 0;
    line-height: 1.6;
}
.main-layout { display: flex; min-height: 100vh; }
.sidebar {
    width: 260px; background-color: var(--sidebar-bg); color: var(--sidebar-text); display: flex;
    flex-direction: column; position: fixed; top: 0; left: 0; height: 100%;
    box-shadow: 4px 0 10px rgba(0,0,0,0.2); transition: width 0.3s;
}
.sidebar-header { padding: 20px; text-align: center; border-bottom: 1px solid var(--sidebar-active-bg); }
.sidebar-header h1 { margin: 0; color: var(--accent-color); font-size: 1.8rem; }
.sidebar-nav { flex-grow: 1; padding: 15px 0; overflow-y: auto; }
.sidebar-nav h3 {
    padding: 10px 20px; margin: 15px 0 5px 0; font-size: 0.8rem;
    color: #888; text-transform: uppercase; letter-spacing: 1px;
}
.sidebar-nav ul { list-style: none; padding: 0; margin: 0; }
.sidebar-nav li a {
    display: block; padding: 12px 20px; color: var(--sidebar-text); text-decoration: none;
    transition: background-color 0.2s, padding-left 0.2s; border-left: 4px solid transparent;
}
.sidebar-nav li a:hover { background-color: var(--sidebar-hover-bg); padding-left: 25px; }
.sidebar-nav li.active a {
    background-color: var(--sidebar-active-bg); font-weight: bold; color: #fff;
    border-left-color: var(--accent-color);
}
.sidebar-footer { padding: 20px; text-align: center; font-size: 0.8rem; color: #888; border-top: 1px solid var(--sidebar-active-bg); }
.content { margin-left: 260px; flex-grow: 1; padding: 20px 40px; transition: margin-left 0.3s; }
.content .container {
    max-width: 100%; margin: 0 auto; padding: 25px; background: var(--card-bg);
    border-radius: 12px; box-shadow: 0 6px 12px rgba(0, 0, 0, 0.08);
}
header h1, .content h1 { color: var(--primary-color); }
header p, .content p { color: var(--subtle-text-color); }

/* Form & Input Elements */
label { display: block; margin-bottom: 8px; font-weight: 600; }
textarea, input[type="text"], input[type="url"], input[type="password"], input[type="email"], select {
    width: 100%; padding: 12px; border-radius: 6px; border: 1px solid #ccc;
    box-sizing: border-box; font-size: 1rem; margin-bottom: 15px; background-color: #f9f9f9;
}
textarea { resize: vertical; min-height: 150px; font-family: "Courier New", Courier, monospace; }
pre {
    background-color: #282c34; color: #abb2bf; padding: 15px; border-radius: 6px; white-space: pre-wrap;
    word-wrap: break-word; font-family: "Courier New", Courier, monospace; font-size: 14px;
}
button {
    display: block; width: 100%; padding: 15px; background-color: var(--primary-color); color: white;
    border: none; border-radius: 6px; font-size: 16px; cursor: pointer; font-weight: bold; transition: background-color 0.2s;
}
button:hover { background-color: #166fe5; }
button:disabled { background-color: #9dbdf2; cursor: not-allowed; }
.message { padding: 15px; margin-bottom: 20px; border-radius: 5px; border: 1px solid transparent; }
.error { background-color: #f8d7da; color: #721c24; border-color: #f5c6cb; }
.success { background-color: #d4edda; color: #155724; border-color: #c3e6cb; }
.info { background-color: #d1ecf1; color: #0c5460; border-color: #bee5eb; }

@media (max-width: 768px) {
    .main-layout { flex-direction: column; }
    .sidebar { position: relative; width: 10