@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@500;700&display=swap');

:root {
    --core-black: #05060a;
    --core-black-2: #0a0c12;
    --core-navy: #1a1c27;
    --core-navy-strong: #0f111a;
    --core-purple: #7c5cff;
    --core-purple-soft: rgba(124, 92, 255, 0.25);
    --core-purple-strong: rgba(93, 95, 255, 0.55);
    --core-white: #e9faff;
}

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

/* BODY */
body {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Orbitron', sans-serif;
    background: var(--core-black);
    color: var(--core-white);
    overflow: hidden;
    transition: opacity .8s ease, transform .8s ease, filter .8s ease;
}

/* BACKGROUND IMAGE */
.bg {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: brightness(0.35) blur(18px);
    z-index: -3;
}

/* DARK GRADIENT OVERLAY */
.dark-overlay {
    position: fixed;
    inset: 0;
    background: linear-gradient(
        to bottom,
        rgba(5, 6, 10, 0.85),
        rgba(5, 6, 10, 0.65),
        rgba(5, 6, 10, 0.85)
    );
    z-index: -2;
}

/* PURPLE LIGHT GLOW */
.purple-glow {
    position: fixed;
    inset: 0;
    background: radial-gradient(
        circle at 50% 70%,
        var(--core-purple-soft),
        transparent 60%
    );
    z-index: -1;
    filter: blur(40px);
}

/* INTRO CONTAINER */
.intro-container {
    text-align: center;
    opacity: 0;
    transform: translateY(40px) scale(0.95);
    animation: introFade 1.4s ease forwards;
}

@keyframes introFade {
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* LOGO */
.logo {
    font-size: 72px;
    font-weight: 700;
    letter-spacing: 6px;
    color: var(--core-white);
    text-shadow:
        0 0 25px var(--core-purple-soft),
        0 0 60px var(--core-purple-soft);
    animation: logoPulse 3s ease-in-out infinite;
}

@keyframes logoPulse {
    0%, 100% { text-shadow: 0 0 25px var(--core-purple-soft); }
    50% { text-shadow: 0 0 45px var(--core-purple-strong); }
}

/* TAGLINE */
.tagline {
    margin-top: 14px;
    font-size: 22px;
    opacity: 0.75;
    letter-spacing: 2px;
}

/* BUTTON */
.start-btn {
    margin-top: 50px;
    padding: 16px 52px;
    font-size: 22px;
    border-radius: 999px;
    border: 2px solid var(--core-purple);
    background: transparent;
    color: var(--core-white);
    font-weight: 700;
    cursor: pointer;
    transition: 0.25s ease;
    letter-spacing: 1px;
}

.start-btn:hover {
    background: var(--core-purple);
    color: var(--core-black);
    box-shadow: 0 0 25px var(--core-purple-soft);
    transform: scale(1.08);
}

/* EXIT ANIMATION */
body.fade-out {
    opacity: 0;
    transform: scale(1.08) translateY(-20px);
    filter: blur(6px);
}