/* PROTOKOL — retro terminal theme */

:root {
    --bg: #020a04;
    --bg-2: #031409;
    --fg: #8cffb0;
    --fg-dim: #4aaa70;
    --fg-bright: #c8ffd9;
    --accent: #ff9b4a;
    --danger: #ff5a5a;
    --scanline: rgba(0, 0, 0, 0.18);

    --p0: #ff5a5a; /* ◆ red */
    --p1: #ffd24a; /* ● yellow */
    --p2: #4acbff; /* ▲ cyan */
    --p3: #b36bff; /* ■ purple */
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    background: #000;
    color: var(--fg);
    font-family: "Consolas", "Cascadia Mono", "Courier New", monospace;
    font-size: 16px;
    overflow: hidden;
}

.crt {
    position: relative;
    min-height: 100vh;
    max-width: 960px;
    margin: 0 auto;
    padding: 18px 28px 48px;
    background: radial-gradient(ellipse at center, var(--bg-2) 0%, var(--bg) 70%, #000 100%);
    box-shadow: inset 0 0 120px rgba(0, 0, 0, 0.8);
}

/* CRT scanlines + subtle flicker */
.crt::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    background: repeating-linear-gradient(
        to bottom,
        transparent 0px,
        transparent 2px,
        var(--scanline) 3px,
        var(--scanline) 3px
    );
    z-index: 999;
}
.crt::after {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    background: radial-gradient(ellipse at center, transparent 55%, rgba(0,0,0,0.55) 100%);
    z-index: 998;
}

.hdr, .ftr {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--fg-dim);
    border-bottom: 1px dashed var(--fg-dim);
    padding-bottom: 6px;
}
.ftr {
    position: absolute;
    left: 28px; right: 28px; bottom: 10px;
    border-bottom: none;
    border-top: 1px dashed var(--fg-dim);
    padding: 6px 0 0;
}
.tag { color: var(--fg-bright); }

.net {
    padding: 2px 8px;
    border: 1px solid currentColor;
    border-radius: 2px;
}
.net.online  { color: var(--fg); }
.net.offline { color: var(--accent); }

.pending {
    color: var(--accent);
}
.hidden { display: none !important; }

/* Screens */
.screen {
    display: none;
    padding: 18px 0;
    animation: fadein 180ms ease;
}
.screen.active { display: block; }

@keyframes fadein {
    from { opacity: 0; transform: translateY(4px); }
    to   { opacity: 1; transform: none; }
}

h2 {
    color: var(--fg-bright);
    letter-spacing: 3px;
    margin: 0 0 18px;
    font-weight: normal;
}

.ascii {
    color: var(--fg-bright);
    font-size: 13px;
    line-height: 1.1;
    margin: 12px 0 6px;
    text-shadow: 0 0 6px var(--fg);
}

.lead {
    font-size: 15px;
    line-height: 1.6;
    margin: 4px 0 22px;
}
.muted { color: var(--fg-dim); }

.field {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin: 14px 0 20px;
    max-width: 340px;
}
.field span {
    font-size: 11px;
    letter-spacing: 2px;
    color: var(--fg-dim);
}
input[type="text"] {
    background: transparent;
    color: var(--fg-bright);
    border: 1px solid var(--fg-dim);
    padding: 10px 12px;
    font: inherit;
    font-size: 18px;
    letter-spacing: 3px;
    text-transform: uppercase;
    outline: none;
    caret-color: var(--fg);
}
input[type="text"]:focus {
    border-color: var(--fg);
    box-shadow: 0 0 10px var(--fg);
}

.actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin: 16px 0;
}

.btn {
    background: transparent;
    color: var(--fg);
    border: 1px solid var(--fg-dim);
    padding: 10px 16px;
    font: inherit;
    font-size: 13px;
    letter-spacing: 2px;
    cursor: pointer;
    transition: all 120ms ease;
}
.btn:hover, .btn:focus {
    color: var(--fg-bright);
    border-color: var(--fg);
    box-shadow: 0 0 10px var(--fg-dim);
    outline: none;
}
.btn.primary {
    border-color: var(--fg);
    color: var(--fg-bright);
}
.btn.tiny {
    padding: 5px 10px;
    font-size: 11px;
    margin-top: 12px;
}

.msg {
    min-height: 1.2em;
    color: var(--accent);
    font-size: 13px;
}
.msg.ok { color: var(--fg); }
.msg.err { color: var(--danger); }

/* HELP */
.steps { line-height: 1.7; }
kbd {
    background: var(--bg-2);
    border: 1px solid var(--fg-dim);
    padding: 1px 6px;
    border-radius: 2px;
    font-size: 12px;
    color: var(--fg-bright);
}

/* GAME HUD */
.hud {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    padding: 10px 0;
    border-bottom: 1px dashed var(--fg-dim);
    font-size: 12px;
    letter-spacing: 2px;
    color: var(--fg-dim);
    text-transform: uppercase;
}
.hud b { color: var(--fg-bright); font-size: 18px; display: block; }

.game-status {
    margin: 22px 0 14px;
    min-height: 1.4em;
    font-size: 16px;
    color: var(--fg-bright);
    letter-spacing: 1px;
}
.game-status.err { color: var(--danger); }
.game-status.ok  { color: var(--fg); }

/* Packet grid */
.packet-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
    margin: 14px 0 20px;
}
.packet {
    position: relative;
    aspect-ratio: 1;
    background: var(--bg-2);
    border: 2px solid var(--fg-dim);
    color: var(--fg);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font: inherit;
    transition: transform 80ms ease;
}
.packet[data-idx="0"] { color: var(--p0); }
.packet[data-idx="1"] { color: var(--p1); }
.packet[data-idx="2"] { color: var(--p2); }
.packet[data-idx="3"] { color: var(--p3); }

.packet .sym {
    font-size: 64px;
    line-height: 1;
    text-shadow: 0 0 12px currentColor;
}
.packet .key {
    position: absolute;
    top: 6px; left: 8px;
    font-size: 12px;
    color: var(--fg-dim);
    letter-spacing: 1px;
}
.packet:hover { border-color: currentColor; }
.packet.active {
    background: currentColor;
    transform: scale(0.96);
}
.packet.active .sym { color: #000; text-shadow: none; }
.packet.active .key { color: #000; }

.packet.glitch { animation: glitch 260ms steps(3); }
@keyframes glitch {
    0%   { filter: none; transform: none; }
    33%  { filter: invert(1) hue-rotate(90deg); transform: translateX(-2px); }
    66%  { filter: none; transform: translateX(2px); }
    100% { filter: none; transform: none; }
}

.echo-row {
    display: flex;
    gap: 6px;
    min-height: 22px;
    margin: 10px 0 4px;
    font-size: 18px;
    letter-spacing: 6px;
}
.echo-row .slot {
    display: inline-block;
    width: 16px;
    text-align: center;
    color: var(--fg-dim);
}
.echo-row .slot.ok  { color: var(--fg-bright); }
.echo-row .slot.bad { color: var(--danger); }

/* GAME OVER */
.result {
    margin: 18px 0;
    font-size: 16px;
    line-height: 1.8;
}
.result b { color: var(--fg-bright); font-size: 20px; }

/* LEADERBOARD */
.lb {
    width: 100%;
    border-collapse: collapse;
    margin: 12px 0;
    font-size: 14px;
}
.lb th, .lb td {
    text-align: left;
    padding: 8px 10px;
    border-bottom: 1px dashed var(--fg-dim);
}
.lb th { color: var(--fg-dim); letter-spacing: 2px; font-weight: normal; text-transform: uppercase; font-size: 11px; }
.lb td { color: var(--fg-bright); }
.lb tr.me td { color: var(--accent); }
.lb tr.local td::after {
    content: " *";
    color: var(--accent);
}

@media (max-width: 560px) {
    .hud { grid-template-columns: repeat(2, 1fr); }
    .ascii { font-size: 10px; }
    .packet .sym { font-size: 44px; }
}