:root {
    --background: #020604;
    --phosphor: #8cff98;
    --dim-phosphor: #3f7d48;
    --border: #24562c;
    --glow: rgba(140, 255, 152, 0.35);
}

* { box-sizing: border-box; }
html { background: var(--background); }

body {
    min-height: 100vh;
    margin: 0;
    overflow-x: hidden;
    background:
        radial-gradient(circle at center, rgba(30, 75, 38, 0.14), transparent 65%),
        var(--background);
    color: var(--phosphor);
    font-family: "Courier New", Courier, monospace;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: 10;
    pointer-events: none;
    background:
        repeating-linear-gradient(
            to bottom,
            rgba(255, 255, 255, 0.025) 0,
            rgba(255, 255, 255, 0.025) 1px,
            rgba(0, 0, 0, 0.08) 2px,
            rgba(0, 0, 0, 0.08) 4px
        );
}

body::after {
    content: "";
    position: fixed;
    inset: 0;
    z-index: 11;
    pointer-events: none;
    background: rgba(140, 255, 152, 0.015);
    animation: flicker 0.18s infinite alternate;
}

.screen {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.terminal,
.interface {
    width: min(720px, 100%);
    border: 1px solid var(--border);
    padding: clamp(1.5rem, 5vw, 3rem);
    background: rgba(0, 10, 4, 0.72);
    box-shadow:
        0 0 20px rgba(0, 0, 0, 0.8),
        0 0 35px var(--glow),
        inset 0 0 25px rgba(140, 255, 152, 0.05);
}

.terminal p {
    margin: 0 0 0.8rem;
    letter-spacing: 0.08em;
    text-shadow: 0 0 8px var(--glow);
}

.boot-line {
    opacity: 0;
    transform: translateY(4px);
}

.boot-line.visible {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 180ms ease, transform 180ms ease;
}

.status {
    margin-top: 2rem !important;
    font-weight: bold;
}

button {
    margin-top: 1rem;
    padding: 0;
    border: 0;
    background: transparent;
    color: var(--phosphor);
    font: inherit;
    font-weight: bold;
    letter-spacing: 0.08em;
    cursor: pointer;
    text-shadow: 0 0 8px var(--glow);
}

#enter-button {
    visibility: hidden;
    opacity: 0;
}

#enter-button.visible {
    visibility: visible;
    opacity: 1;
    animation: blink 1.1s step-end infinite;
    transition: opacity 250ms ease;
}

button:hover,
button:focus-visible {
    color: white;
    outline: 1px dashed var(--phosphor);
    outline-offset: 0.4rem;
}

.interface { text-align: center; }

.logo {
    display: block;
    width: min(280px, 70vw);
    max-height: 320px;
    margin: 0 auto 1.5rem;
    object-fit: contain;
    filter:
        grayscale(1)
        contrast(1.2)
        brightness(0.9)
        drop-shadow(0 0 14px var(--glow));
}

h1 {
    margin: 0;
    font-size: clamp(1.8rem, 6vw, 3.5rem);
    letter-spacing: 0.15em;
    text-shadow: 0 0 12px var(--glow);
}

.tagline {
    margin: 1rem 0 2.5rem;
    color: var(--dim-phosphor);
    letter-spacing: 0.05em;
}

nav {
    display: grid;
    gap: 0.7rem;
    margin: 2rem 0;
}

nav a {
    display: block;
    border: 1px solid transparent;
    padding: 0.55rem 1rem;
    color: var(--phosphor);
    text-decoration: none;
    letter-spacing: 0.08em;
    transition:
        border-color 120ms ease,
        background-color 120ms ease,
        color 120ms ease;
}

nav a::before { content: "[ "; }
nav a::after { content: " ]"; }

nav a:hover,
nav a:focus-visible {
    border-color: var(--border);
    background: rgba(140, 255, 152, 0.06);
    color: white;
    outline: none;
}

footer {
    margin-top: 3rem;
    color: var(--dim-phosphor);
    font-size: 0.75rem;
    letter-spacing: 0.06em;
}

.hidden { display: none !important; }
.fade-out { animation: fadeOut 700ms forwards; }
.fade-in { animation: fadeIn 900ms forwards; }

@keyframes blink { 50% { opacity: 0; } }
@keyframes flicker { from { opacity: 0.75; } to { opacity: 1; } }
@keyframes fadeOut {
    from { opacity: 1; }
    to { opacity: 0; transform: scale(1.015); }
}
@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.985); }
    to { opacity: 1; transform: scale(1); }
}

@media (prefers-reduced-motion: reduce) {
    body::after { animation: none; }
    .boot-line { opacity: 1; transform: none; }
    #enter-button { visibility: visible; opacity: 1; }
    .fade-out,
    .fade-in { animation-duration: 0.01ms; }
}