body {
    margin: 0;
    padding: 0;
    background: #0b1020;
    color: #e7edf7;
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.7;
}

.container {
    width: min(1200px, 92%);
    margin: 0 auto;
    padding-left: 1.25rem;
    padding-right: 1.25rem;
}

header {
    padding: 7rem 0 4rem 0;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    background:
        radial-gradient(circle at top, rgba(76, 121, 255, 0.15), transparent 50%),
        linear-gradient(to bottom, #0b1020, #0e152b);
}

.protocol-label {
    display: inline-block;
    padding: 0.45rem 0.9rem;
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 999px;
    font-size: 0.9rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: #a9bbff;
    margin-bottom: 1.5rem;
}

h1 {
    font-size: clamp(3rem, 7vw, 5.8rem);
    margin: 0;
    line-height: 1;
    letter-spacing: -0.04em;
}

.subtitle {
    margin-top: 1.5rem;
    font-size: 1.35rem;
    max-width: 850px;
    color: #c4d2ef;
}

.core-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 4rem;
}

.core-card {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 18px;
    padding: 1.5rem;
}

.core-card h3 {
    margin-top: 0;
    color: #9bb2ff;
}

nav.submenu {
    position: sticky;
    top: 0;
    z-index: 999;
    background: rgba(9, 13, 24, 0.96);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

nav.submenu ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin: 0;
    padding: 1rem 0;
}

nav.submenu a {
    color: #d7e1ff;
    text-decoration: none;
    font-size: 0.95rem;
    transition: color 0.2s ease;
}

nav.submenu a:hover {
    color: #8fb1ff;
}

section {
    padding: 5rem 0;
    border-bottom: 1px solid rgba(255,255,255,0.06);
    scroll-margin-top: 90px;
}

h2 {
    font-size: 2.3rem;
    margin-bottom: 1.2rem;
}

p {
    max-width: 900px;
    color: #d4ddf1;
}

.definition-box {
    background: rgba(255,255,255,0.035);
    border-left: 4px solid #7fa4ff;
    padding: 1.5rem;
    border-radius: 10px;
    margin-top: 2rem;
}

.link-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 3rem;
}

.link-card {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 18px;
    padding: 1.5rem;
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.link-card:hover {
    transform: translateY(-4px);
    border-color: rgba(140,170,255,0.45);
}

.link-card a {
    color: #ffffff;
    text-decoration: none;
    font-size: 1.15rem;
    font-weight: bold;
}

.link-card p {
    font-size: 0.95rem;
    margin-top: 0.8rem;
}

code {
    background: rgba(255,255,255,0.08);
    padding: 0.2rem 0.45rem;
    border-radius: 6px;
}

/* ==========================================
   FOOTER
========================================== */

footer {
    padding: 3rem 0;
    color: #9fb0cf;
    font-size: 0.92rem;
    text-align: center;
}

/* Without any main.css flex interference */
footer .container {
    display: flex;
    flex-direction: column;
    align-items: center;

    width: 100%;
    max-width: 100%;

    margin: 0 auto;
    padding: 0;
}

/* Footer navigation */

.footer-links {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 5rem;

    width: fit-content;
    margin: 0 auto 1rem auto;
}

/* Strong electric blue */

.footer-links a,
footer a,
footer a:visited {
    color: #39a9ff !important;
    text-decoration: none;
    font-size: 0.96rem;
    font-weight: 700;
    opacity: 1 !important;
    visibility: visible !important;
}

.footer-links a:hover {
    color: #7fd0ff !important;
    text-decoration: underline;
}

/* Footer text spacing */

footer p {
    margin: 0.35rem 0;
}

/* Mobile */

@media (max-width: 768px) {

    .footer-links {
        max-width: 360px;
    }

}