* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: system-ui, Arial, sans-serif;
}

body {
    background: #f4f6fb;
    color: #333;
    height: 100vh;
}

/* HEADER */
.top {
    background: linear-gradient(135deg, #4f46e5, #6366f1);
    color: white;
    padding: 20px 40px;
}

.top h1 {
    font-size: 26px;
}

.top span {
    opacity: 0.85;
    font-size: 14px;
}

/* LAYOUT */
.layout {
    display: flex;
    height: calc(100vh - 90px);
}

/* SIDEBAR */
.sidebar {
    width: 260px;
    background: white;
    padding: 25px;
    overflow-y: auto;
    border-right: 1px solid #e5e7eb;
}

.sidebar h3 {
    margin-top: 20px;
    margin-bottom: 10px;
    font-size: 14px;
    color: #4f46e5;
    text-transform: uppercase;
}

.sidebar a {
    display: block;
    padding: 10px 12px;
    margin-bottom: 6px;
    border-radius: 8px;
    cursor: pointer;
    color: #333;
    transition: 0.2s;
}

.sidebar a:hover {
    background: #eef2ff;
    color: #4f46e5;
}

/* CONTENT */
.content {
    flex: 1;
    padding: 20px;
}

iframe {
    width: 100%;
    height: 100%;
    border: none;
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.08);
}