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

:root {
    --background-top: #12384a;
    --background-middle: #0a2634;
    --background-bottom: #04141d;

    --surface-color: rgba(10, 38, 52, 0.84);
    --surface-color-solid: #0a2634;

    --text-color: #f4f8fa;
    --secondary-text-color: #a2bac4;

    --accent-color: #56b5c7;
    --accent-color-dark: #0b2631;

    --border-color: rgba(128, 192, 207, 0.18);

    --container-width: 1200px;
}

html {
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;

    background:
        radial-gradient(
            circle at 50% -8%,
            rgba(99, 201, 219, 0.34) 0%,
            rgba(41, 111, 137, 0.22) 28%,
            transparent 58%
        ),
        linear-gradient(
            180deg,
            var(--background-top) 0%,
            var(--background-middle) 38%,
            #071e2a 68%,
            var(--background-bottom) 100%
        );

    background-attachment: fixed;

    color: var(--text-color);

    font-family: "Inter", sans-serif;
}

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

img {
    display: block;
    max-width: 100%;
}

.container {
    width: min(90%, var(--container-width));
    margin: 0 auto;
}

.button {
    display: inline-flex;

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

    padding: 16px 36px;

    border: none;
    border-radius: 12px;

    font-family: inherit;
    font-size: 16px;
    font-weight: 600;

    text-decoration: none;

    cursor: pointer;

    transition:
        background-color .3s ease,
        color .3s ease,
        border-color .3s ease,
        transform .25s ease,
        box-shadow .25s ease;
}

.button:hover {
    transform: translateY(-2px);
}

.button-primary {
    background: var(--accent-color);
    color: var(--accent-color-dark);
}

.button-primary:hover {
    background: #69c4d6;
}

.button-secondary {
    background: transparent;

    color: var(--text-color);

    border: 1px solid var(--border-color);
}

.button-secondary:hover {
    background: rgba(255,255,255,.04);

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