* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #eef4ff;
    color: #1f2937;
    line-height: 1.6;
}

header {
    background: linear-gradient(135deg, #1d4ed8, #60a5fa);
    color: white;
    text-align: center;
    padding: 45px 20px;
}

header h1 {
    margin: 0 0 10px;
    font-size: 36px;
}

header p {
    max-width: 700px;
    margin: 0 auto;
    font-size: 18px;
}

nav {
    background: #111827;
    text-align: center;
    padding: 12px;
}

nav a {
    color: white;
    text-decoration: none;
    margin: 0 14px;
    font-weight: bold;
}

nav a:hover {
    color: #93c5fd;
}


.hero-image {
    display: block;
    max-width: 360px;
    width: 90%;
    margin: 25px auto 0;
    border-radius: 18px;
    box-shadow: 0 8px 22px rgba(0, 0, 0, 0.25);
}

.section-image {
    display: block;
    width: 100%;
    max-width: 520px;
    margin: 10px auto 20px;
    border-radius: 16px;
    border: 3px solid #dbeafe;
    background: #eff6ff;
}

main {
    max-width: 1000px;
    margin: 25px auto;
    padding: 0 15px;
}

.card {
    background: white;
    margin-bottom: 25px;
    padding: 25px;
    border-radius: 14px;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.12);
}

.card h2 {
    color: #1d4ed8;
    margin-top: 0;
}

.timeline {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 18px;
}

.timeline article {
    border-left: 5px solid #2563eb;
    background: #f8fbff;
    padding: 15px;
    border-radius: 10px;
}

.timeline h3 {
    margin-top: 0;
    color: #111827;
}

ul {
    padding-left: 25px;
}

.summary {
    border: 2px solid #93c5fd;
}

.top-link {
    display: inline-block;
    margin-top: 18px;
    padding: 10px 16px;
    background: #1d4ed8;
    color: white;
    text-decoration: none;
    border-radius: 22px;
    font-size: 15px;
    font-weight: bold;
    border: 2px solid #0f3aa8;
}

.top-link:hover {
    background: #2563eb;
}

.floating-top {
    position: fixed;
    right: 18px;
    bottom: 18px;
    z-index: 10;
    background: #111827;
    color: white;
    text-decoration: none;
    padding: 12px 16px;
    border-radius: 25px;
    font-weight: bold;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
}

.floating-top:hover {
    background: #1d4ed8;
}


footer {
    background: #111827;
    color: white;
    text-align: center;
    padding: 18px;
    margin-top: 30px;
}