* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background: linear-gradient(180deg, #66CCFF 0%, #dff6ff 18%, #ffffff 55%, #eaf9ff 100%);
    font-family: Arial, Helvetica, sans-serif;
    color: #2f3d4a;
    line-height: 1.7;
    padding: 18px;
}

/* main area */
.page-wrapper {
    max-width: 1180px;
    margin: auto;
}

/* top section */
.intro header {
    background: #66CCFF;
    color: white;
    padding: 34px 20px;
    text-align: center;
    border-radius: 16px;
    margin-bottom: 20px;
    box-shadow: 0 5px 14px rgba(0,0,0,0.12);
}

.intro header h1 {
    font-size: 2.7rem;
    letter-spacing: 2px;
    margin-bottom: 8px;
}

.intro header h2 {
    font-size: 1.15rem;
    font-weight: normal;
}

/* text cards */
.summary,
.preamble,
.explanation,
.participation,
.benefits,
.requirements {
    background: white;
    margin-bottom: 18px;
    padding: 20px 22px;
    border-left: 10px solid #66CCFF;
    border-radius: 14px;
    box-shadow: 0 4px 10px rgba(80, 140, 170, 0.14);
}

/* headings */
h3 {
    color: #3aaee0;
    font-size: 1.35rem;
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* paragraphs */
p {
    margin-bottom: 12px;
}

/* links */
a {
    color: #169ed8;
    text-decoration: none;
    font-weight: bold;
}

a:hover {
    color: #ff8c42;
    text-decoration: underline;
}

/* slightly messy layout on purpose */
.main.supporting {
    width: 67%;
    display: inline-block;
    vertical-align: top;
    margin-right: 2.5%;
}

.sidebar {
    width: 29%;
    display: inline-block;
    vertical-align: top;
}

/* sidebar style */
.sidebar .wrapper {
    background: #f2fbff;
    border: 2px solid #66CCFF;
    border-radius: 16px;
    padding: 18px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

/* sidebar section title */
.sidebar h3 {
    background: #66CCFF;
    color: white;
    padding: 10px 12px;
    border-radius: 10px;
    margin-bottom: 10px;
    font-size: 1rem;
}

/* list cleanup */
.sidebar ul {
    list-style: none;
    padding-left: 0;
}

.sidebar li {
    background: white;
    border: 1px solid #c9efff;
    padding: 10px 12px;
    margin-bottom: 10px;
    border-radius: 10px;
}

/* alternating color */
.sidebar li:nth-child(even) {
    background: #e8f8ff;
}

.design-selection,
.design-archives,
.zen-resources {
    margin-bottom: 18px;
}

/* footer buttons */
footer {
    margin-top: 20px;
    background: #66CCFF;
    padding: 18px 10px;
    text-align: center;
    border-radius: 14px;
}

footer a {
    display: inline-block;
    background: white;
    color: #2ea8dc;
    padding: 8px 14px;
    margin: 6px;
    border-radius: 20px;
    transition: 0.25s;
}

footer a:hover {
    background: #dff6ff;
    color: #ff8c42;
    text-decoration: none;
    transform: translateY(-2px);
}

/* some simple decoration */
.summary::before,
.preamble::before,
.explanation::before,
.participation::before,
.benefits::before,
.requirements::before {
    content: "◆ ";
    color: #66CCFF;
    font-size: 1.1rem;
}

/* make first intro paragraph a little different */
.preamble p:first-of-type {
    color: #4d7182;
    font-style: italic;
}

/* one section with different color so page not too flat */
.requirements {
    background: #fefefe;
    border-left: 10px solid #42c7ff;
}

/* author/info line */
.requirements p:last-child {
    background: #eefaff;
    border: 1px dashed #66CCFF;
    padding: 10px;
    border-radius: 10px;
}

/* one more place using the blue */
.summary {
    background: linear-gradient(to right, #ffffff 70%, #e4f7ff 100%);
}

.benefits {
    background: linear-gradient(to right, #ffffff 72%, #eaf9ff 100%);
}

/* responsive */
@media screen and (max-width: 900px) {
    .main.supporting,
    .sidebar {
        width: 100%;
        display: block;
        margin-right: 0;
    }

    .sidebar {
        margin-top: 20px;
    }

    .intro header h1 {
        font-size: 2rem;
    }
}