:root {
    --primary: #00f2fe;
    --secondary: #4facfe;
    --accent: #f093fb;
    --bg-dark: #050507;
    --text-bright: #ffffff;
    --text-dim: rgba(255, 255, 255, 0.5);
    --grid-color: rgba(0, 242, 254, 0.05);
}

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

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: var(--bg-dark);
}

body {
    color: var(--text-bright);
    font-family: 'Inter', sans-serif;
}

/*
 * App wrapper: position:fixed creates a layer divorced from
 * document flow entirely. Nothing inside can affect scrollHeight.
 */
#app-wrapper {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

/* ========================================
   Background Grid — CSS-only, no bloated elements.
   Uses a pseudo-element with a repeating background.
   The perspective effect is purely visual via a gradient fade.
   ======================================== */
#app-wrapper::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(var(--grid-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
    background-size: 50px 50px;
    mask-image: linear-gradient(to top, transparent 0%, rgba(0,0,0,0.6) 30%, rgba(0,0,0,0.2) 70%, transparent 100%);
    -webkit-mask-image: linear-gradient(to top, transparent 0%, rgba(0,0,0,0.6) 30%, rgba(0,0,0,0.2) 70%, transparent 100%);
    animation: gridMove 20s linear infinite;
    pointer-events: none;
    z-index: 0;
}

@keyframes gridMove {
    from { background-position: 0 0; }
    to   { background-position: 0 50px; }
}

/* ========================================
   Shockwave
   ======================================== */
.shockwave {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 10px;
    height: 10px;
    background: radial-gradient(circle, transparent 20%, var(--primary) 40%, transparent 60%);
    border-radius: 50%;
    transform: translate(-50%, -50%) scale(0);
    pointer-events: none;
    opacity: 0;
    z-index: 10;
}

.shockwave.active {
    animation: shockwaveAnim 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}

@keyframes shockwaveAnim {
    0%   { transform: translate(-50%, -50%) scale(0); opacity: 0.8; }
    100% { transform: translate(-50%, -50%) scale(80); opacity: 0; }
}

/* ========================================
   Cyber Core (rings) — percentage-based sizing
   ======================================== */
.cyber-core {
    position: absolute;
    width: clamp(280px, 80vw, 800px);
    height: clamp(280px, 80vw, 800px);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    opacity: 0.12;
    pointer-events: none;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1;
}

.ring {
    position: absolute;
    border-radius: 50%;
    border: 1px solid var(--primary);
    box-shadow: 0 0 15px rgba(0, 242, 254, 0.4), inset 0 0 15px rgba(0, 242, 254, 0.4);
}

.ring-1 {
    width: 87.5%;
    height: 87.5%;
    border-style: dashed;
    border-width: 3px;
    border-color: var(--accent);
    opacity: 0.8;
}

.ring-2 {
    width: 68.75%;
    height: 68.75%;
    border-style: dotted;
    border-width: 6px;
}

.ring-3 {
    width: 50%;
    height: 50%;
    border: 4px solid var(--primary);
    border-left-color: transparent;
    border-right-color: transparent;
}

.ring-4 {
    width: 31.25%;
    height: 31.25%;
    border-style: dashed;
    border-width: 2px;
    border-color: var(--accent);
}

.center-node {
    width: 10%;
    height: 10%;
    background: rgba(0, 242, 254, 0.1);
    box-shadow: 0 0 40px var(--primary);
    border: 2px solid var(--primary);
    border-radius: 50%;
}

/* ========================================
   Main Content
   ======================================== */
main {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 90%;
    max-width: 800px;
    text-align: center;
    padding: 2rem;
    z-index: 5;
}

main.shake {
    animation: shakeAnim 0.3s ease-in-out;
}

@keyframes shakeAnim {
    0%, 100% { transform: translate(-50%, -50%); }
    25%      { transform: translate(calc(-50% - 10px), calc(-50% - 5px)); }
    50%      { transform: translate(calc(-50% + 10px), calc(-50% + 5px)); }
    75%      { transform: translate(calc(-50% - 5px), -50%); }
}

.logo-placeholder {
    margin-bottom: 2rem;
    display: flex;
    justify-content: center;
}

.logo-box {
    width: 64px;
    height: 64px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 700;
    font-size: 1.5rem;
    letter-spacing: 2px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.corner {
    position: absolute;
    width: 8px;
    height: 8px;
    border: 2px solid var(--primary);
}
.tl { top: -2px; left: -2px; border-right: 0; border-bottom: 0; }
.tr { top: -2px; right: -2px; border-left: 0; border-bottom: 0; }
.bl { bottom: -2px; left: -2px; border-right: 0; border-top: 0; }
.br { bottom: -2px; right: -2px; border-left: 0; border-top: 0; }

/* Typography — fully fluid, never overflows */
h1 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: clamp(1.5rem, 5vw, 4rem);
    font-weight: 700;
    letter-spacing: clamp(0.1em, 2vw, 0.3em);
    margin-bottom: 1rem;
    text-indent: 0.3em;
    background: linear-gradient(to bottom, #fff, #888);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    overflow-wrap: break-word;
    word-break: break-word;
}

.tagline {
    font-size: clamp(0.85rem, 2.5vw, 1.25rem);
    color: var(--text-dim);
    margin-bottom: 3rem;
    padding: 0 1rem;
}

.highlight {
    color: var(--primary);
    font-weight: 600;
}

.btn-main {
    display: inline-flex;
    align-items: center;
    gap: 1rem;
    background: var(--text-bright);
    color: var(--bg-dark);
    text-decoration: none;
    padding: 1rem 2rem;
    border-radius: 0.5rem;
    font-weight: 700;
    transition: all 0.3s ease;
}

.btn-main:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 242, 254, 0.2);
    background: var(--primary);
}

footer {
    position: absolute;
    bottom: 1.5rem;
    left: 0;
    width: 100%;
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-dim);
    letter-spacing: 0.1em;
    z-index: 5;
}

@media (max-width: 768px) {
    .logo-box {
        width: 48px;
        height: 48px;
        font-size: 1.2rem;
    }

    .tagline {
        margin-bottom: 2rem;
    }
}