/* ======================== */
/*        기본 스타일       */
/* ======================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: black;
    overflow: hidden;
    font-family: Helvetica, Arial, sans-serif;
    color: white;
    height: 100%;
}

/* 스크롤바 숨기기 */
::-webkit-scrollbar {
    width: 0;
    height: 0;
}

/* ======================== */
/*      오른쪽 상단 About   */
/* ======================== */
.navbar {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 10000;
}

.navbar a {
    color: gray; /* 초기 색상 */
    text-decoration: none;
    font-size: 21px;
    font-weight: 300; /* 얇은 글씨 */
    font-family: Helvetica, Arial, sans-serif;
    cursor: pointer;
    transition: color 0.3s ease, text-shadow 0.3s ease;
}

/* 빔 가까이 접근 or 호버 시 글로우 */
.navbar a.beam-hover,
.navbar a:hover {
    color: white !important;
    text-shadow: 0 0 10px white, 0 0 20px white, 0 0 40px white;
}

/* ======================== */
/*        빔 라이트 CSS      */
/* ======================== */
.beam {
    position: fixed;
    top: 0;
    left: 0;
    width: 200px;
    height: 200px;
    pointer-events: none;
    border-radius: 50%;
    background-color: white;
    filter: blur(90px) brightness(1);
    transform: translate(-50%, -50%);
    z-index: 9998;
    animation: flickerPC 0.25s infinite;
}

/* 모바일 빔 라이트 */
@media (max-width: 768px) {
    .beam {
        width: 60px;
        height: 60px;
        filter: blur(50px) brightness(1);
    }
}

/* PC 플리커링 */
@keyframes flickerPC {
    0%   { filter: blur(90px) brightness(0.85); }
    10%  { filter: blur(90px) brightness(0.9); }
    20%  { filter: blur(90px) brightness(0.95); }
    30%  { filter: blur(90px) brightness(1); }
    40%  { filter: blur(90px) brightness(0.92); }
    50%  { filter: blur(90px) brightness(0.87); }
    60%  { filter: blur(90px) brightness(0.9); }
    70%  { filter: blur(90px) brightness(0.95); }
    80%  { filter: blur(90px) brightness(1); }
    90%  { filter: blur(90px) brightness(0.9); }
    100% { filter: blur(90px) brightness(0.85); }
}

/* 모바일 플리커링 */
@media (max-width: 768px) {
    @keyframes flickerMobile {
        0%   { filter: blur(50px) brightness(0.8); }
        10%  { filter: blur(50px) brightness(0.85); }
        20%  { filter: blur(50px) brightness(0.9); }
        30%  { filter: blur(50px) brightness(0.95); }
        40%  { filter: blur(50px) brightness(1); }
        50%  { filter: blur(50px) brightness(0.92); }
        60%  { filter: blur(50px) brightness(0.9); }
        70%  { filter: blur(50px) brightness(0.95); }
        80%  { filter: blur(50px) brightness(1); }
        90%  { filter: blur(50px) brightness(0.9); }
        100% { filter: blur(50px) brightness(0.85); }
    }

    .beam {
        animation: flickerMobile 0.25s infinite;
    }
}