* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Helvetica Neue", Arial, sans-serif;
    color: #1f2933;
    background-color: #f8fafc;
}

a {
    color: inherit;
    text-decoration: none;
}

header {
    background: linear-gradient(120deg, #0ea5e9, #2563eb);
    color: #ffffff;
    padding: 32px 0 24px;
}

.container {
    width: min(1100px, 92%);
    margin: 0 auto;
    padding: 0 16px;
}

.brand {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.brand h1 {
    margin: 0;
    font-size: clamp(26px, 4vw, 36px);
    letter-spacing: 0.02em;
}

.brand p {
    margin: 0;
    max-width: 620px;
    line-height: 1.6;
}

nav {
    margin-top: 24px;
}

nav ul {
    display: flex;
    gap: 20px;
    list-style: none;
    padding: 0;
    margin: 0;
    flex-wrap: wrap;
}

nav li {
    position: relative;
}

nav a {
    display: inline-block;
    padding: 10px 18px;
    border-radius: 999px;
    transition: background-color 0.3s ease, color 0.3s ease, transform 0.3s ease;
    font-weight: 600;
    letter-spacing: 0.01em;
}

nav a:hover,
nav a:focus {
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

nav li.active a {
    background-color: #ffffff;
    color: #1d4ed8;
    box-shadow: 0 6px 18px rgba(15, 23, 42, 0.16);
}

main {
    padding: 48px 0 64px;
}

.content {
    width: min(960px, 92%);
    margin: 0 auto;
    display: grid;
    gap: 32px;
}

.content h2 {
    margin: 0;
    font-size: clamp(24px, 3vw, 32px);
    color: #0f172a;
}

.content section {
    background-color: #ffffff;
    padding: clamp(22px, 3vw, 30px);
    border-radius: 16px;
    box-shadow: 0 18px 45px rgba(15, 23, 42, 0.06);
    line-height: 1.8;
}

.content section h3 {
    margin-top: 0;
    font-size: clamp(20px, 2.6vw, 26px);
    color: #1d4ed8;
}

.content section p {
    margin: 12px 0;
}

.content section ul {
    padding-left: 20px;
    margin: 12px 0;
}

.content section ol {
    padding-left: 24px;
    margin: 12px 0;
}

.content section li {
    margin-bottom: 8px;
}

.content section ol li {
    margin-bottom: 8px;
}

.card-grid {
    display: grid;
    gap: 20px;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.card {
    background-color: #f1f5f9;
    border-radius: 14px;
    padding: 20px;
    box-shadow: inset 0 0 0 1px rgba(37, 99, 235, 0.08);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(15, 23, 42, 0.08);
}

.card h4 {
    margin-top: 0;
    margin-bottom: 8px;
    color: #1e40af;
    font-size: 18px;
}

.card p {
    margin: 0;
    color: #475569;
}

.cta {
    background: linear-gradient(120deg, rgba(14, 165, 233, 0.12), rgba(37, 99, 235, 0.12));
    border: 1px solid rgba(37, 99, 235, 0.2);
}

.cta strong {
    color: #1d4ed8;
}

.contact-details {
    display: grid;
    gap: 16px;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.contact-item {
    background-color: #f8fafc;
    border-radius: 12px;
    padding: 16px 18px;
    box-shadow: inset 0 0 0 1px rgba(15, 23, 42, 0.08);
}

.contact-item h4 {
    margin: 0 0 8px;
    color: #1d4ed8;
}

footer {
    background-color: #0f172a;
    color: #e2e8f0;
    text-align: center;
    padding: 22px 16px;
    font-size: 14px;
}

footer a {
    color: #93c5fd;
}

.footer-note {
    margin-top: 6px;
    color: #cbd5f5;
}

.notice {
    background-color: #eff6ff;
    border-left: 4px solid #3b82f6;
    padding: 16px 18px;
    border-radius: 10px;
}

.notice strong {
    color: #1d4ed8;
}

@media (max-width: 640px) {
    nav ul {
        gap: 12px;
    }

    nav a {
        padding: 8px 14px;
    }

    header {
        padding: 28px 0 20px;
    }
}