:root {

    --white: #ffffff;
    --light-silver: #e8e8e8;
    --silver: #cfcfcf;

    --navy: #020817;
    --black: #000000;

    --cyan: #1ecfff;
    --electric: #00b5ff;
    --cyber: #0096ff;
    --tech: #006bea;
    --accent: #0047a8;

    --max-width: 1200px;
}

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

html {
    scroll-behavior: smooth;
}

body {

    font-family:
        "Inter",
        "Segoe UI",
        sans-serif;

    background: #ffffff;
    color: #111827;
    line-height: 1.7;
}

p {

    font-size: 1rem;
    color: #111827;
    font-weight: 500;
}

.container {

    width: 90%;
    max-width: var(--max-width);
    margin: 0 auto;
}

/* HEADER */

.site-header {

    background:
        linear-gradient(
            90deg,
            #0047A8 0%,
            #006BEA 100%
        );

    position: sticky;
    top: 0;
    z-index: 1000;

    border-bottom:
        1px solid rgba(255,255,255,.15);
}

.header-container {

    display: flex;
    align-items: center;
    justify-content: center;

    min-height: 78px;
}

.brand img {

    height: 48px;
    width: auto;
}

.nav ul {

    list-style: none;
    display: flex;
    gap: 2rem;
}

.nav a {

    color: var(--white);

    text-decoration: none;

    font-size: 1.05rem;
    font-weight: 700;

    letter-spacing: .02em;

    transition: color .2s ease;
}

@media (max-width: 768px) {
    .nav a {
        font-size: 1rem;
        font-weight: 700;
    }
}

.nav a:hover {
    color: var(--electric);
}

/* HERO */

.hero {

    background: #000000;

    color: white;

    padding:
        100px 0
        120px;
}

.hero-content {

    text-align: center;
}

.hero-logo {

    width: 100%;
    max-width: 640px;
    margin-bottom: 2rem;
}

.hero-tagline {

    color: var(--electric);

    letter-spacing: 4px;
    font-weight: 700;

    margin-bottom: 1.5rem;
}

.hero h1 {

    max-width: 850px;
    margin: auto;

    font-size: clamp(
        2.2rem,
        5vw,
        4rem
    );

    line-height: 1.2;

    margin-bottom: 1.5rem;
}

.hero-description {

    max-width: 760px;
    margin: auto;

    color: var(--silver);
    font-size: 1.1rem;

    margin-bottom: 2rem;
}

.hero-buttons {

    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

/* BUTTONS */

.btn {

    text-decoration: none;

    padding:
        .9rem
        1.5rem;

    border-radius: 8px;

    font-weight: 600;
}

.btn-primary {

    background: var(--cyber);
    color: white;
}

.btn-primary:hover {

    background: var(--tech);
}

.btn-secondary {

    border:
        1px solid
        rgba(255,255,255,.25);

    color: white;
}

.btn-secondary:hover {

    border-color:
        var(--electric);
}

/* SECTIONS */

.section {

    padding:
        90px
        0;
}

.section-alt {

    background:
        #f8fafc;
}

.section-heading {

    text-align: center;
    margin-bottom: 3rem;
}

.section-heading h2 {

    font-size: 2rem;
    margin-bottom: .75rem;
}

.divider {

    width: 80px;
    height: 3px;

    background:
        var(--electric);

    margin: auto;
}

/* CARDS */

.content-grid {

    display: grid;
    gap: 2rem;

    grid-template-columns:
        repeat(
            auto-fit,
            minmax(260px,1fr)
        );
}

.card {

    background: white;

    border:
        1px solid #e5e7eb;

    border-radius: 12px;

    padding: 2rem;
}

.card h3 {

    color: var(--tech);
    margin-bottom: 1rem;
}

.card p,
.step p {

    color: #111827;
    font-weight: 500;
    font-size: 1.1rem;
}

/* METHODOLOGY */

.methodology-grid {

    display: grid;
    gap: 2rem;

    grid-template-columns:
        repeat(
            auto-fit,
            minmax(220px,1fr)
        );
}

.step {

    background: white;

    border-radius: 12px;
    padding: 2rem;

    border:
        1px solid #e5e7eb;
}

.step span {

    display: block;

    color: var(--electric);

    font-size: 2rem;
    font-weight: 700;

    margin-bottom: .75rem;
}

/* RESEARCH */

.research-layout {

    display: grid;
    gap: 2rem;

    grid-template-columns:
        repeat(
            auto-fit,
            minmax(300px,1fr)
        );
}

.research-list {

    padding-left: 1.2rem;
}

/* CONTACT */

.contact-card {

    max-width: 900px;
    margin: auto;
}

.contact-list {

    list-style: none;
    margin-top: 1.5rem;
}

.contact-list li {

    margin-bottom: .75rem;
}

/* FOOTER */

.site-footer {

    background: #000000;

    color: var(--silver);

    text-align: center;

    border-top:
        1px solid rgba(0,181,255,.20);

    box-shadow:
        0 -1px 0 rgba(0,107,234,.10);

    padding:
        2rem
        0;
}

/* MOBILE */

@media (max-width: 768px) {

    .header-container {

        flex-direction: column;
        gap: 1rem;

        padding:
            1rem
            0;
    }

    .nav ul {

        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }

    .hero {

        padding:
            80px
            0;
    }

    p {

    font-size: 1rem;
    color: #111827;
    font-weight: 500;
    }
}

.hero::after {

    content: "";

    display: block;

    width: 100%;
    height: 1px;

    background:
        linear-gradient(
            90deg,
            transparent,
            #00B5FF,
            transparent
        );

    margin-top: 80px;
}