:root {
    --bg: #0d1117;
    --bg-panel: #161b22;
    --accent: #f2a900;
    --accent-dim: #8a6200;
    --text: #e6edf3;
    --text-dim: #8b949e;
    --danger: #f85149;
    --border: #30363d;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    background: var(--bg);
    color: var(--text);
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

body.center-screen {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background:
        linear-gradient(180deg, rgba(13,17,23,0.75), rgba(13,17,23,0.95)),
        repeating-linear-gradient(45deg, #11161c 0 2px, #0d1117 2px 40px);
}

.panel {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 32px;
    width: 100%;
    max-width: 380px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}

.brand {
    text-align: center;
    margin-bottom: 24px;
}

.brand .logo {
    font-size: 28px;
    font-weight: 800;
    letter-spacing: 2px;
    color: var(--accent);
    text-transform: uppercase;
}

.brand .sub {
    color: var(--text-dim);
    font-size: 13px;
    margin-top: 4px;
    letter-spacing: 1px;
}

.tabs {
    display: flex;
    margin-bottom: 20px;
    border: 1px solid var(--border);
    border-radius: 6px;
    overflow: hidden;
}

.tabs a {
    flex: 1;
    text-align: center;
    padding: 10px;
    color: var(--text-dim);
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    background: var(--bg);
}

.tabs a.active {
    background: var(--accent);
    color: #1a1200;
}

form { display: flex; flex-direction: column; gap: 14px; }

label {
    font-size: 12px;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
    display: block;
}

input[type=text], input[type=password] {
    width: 100%;
    padding: 11px 12px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text);
    font-size: 14px;
}

input[type=text]:focus, input[type=password]:focus {
    outline: none;
    border-color: var(--accent);
}

button.btn {
    padding: 12px;
    background: var(--accent);
    border: none;
    border-radius: 6px;
    color: #1a1200;
    font-weight: 700;
    font-size: 15px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    cursor: pointer;
    margin-top: 6px;
}

button.btn:hover { background: #ffbe1f; }

button.btn.secondary {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
}

button.btn.secondary:hover { border-color: var(--accent); color: var(--accent); }

.error-msg {
    background: rgba(248, 81, 73, 0.12);
    border: 1px solid var(--danger);
    color: #ffb4ae;
    padding: 10px 12px;
    border-radius: 6px;
    font-size: 13px;
    margin-bottom: 16px;
}

/* Lobby */
.lobby-wrap {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 28px;
    background:
        linear-gradient(180deg, rgba(13,17,23,0.7), rgba(13,17,23,0.95)),
        repeating-linear-gradient(45deg, #11161c 0 2px, #0d1117 2px 40px);
    text-align: center;
    padding: 20px;
}

.lobby-wrap .greet { color: var(--text-dim); font-size: 14px; }
.lobby-wrap .greet b { color: var(--text); }

.lobby-wrap .logo { font-size: 40px; font-weight: 800; color: var(--accent); letter-spacing: 3px; }

.lobby-actions { display: flex; flex-direction: column; gap: 12px; width: 260px; }

.play-btn {
    padding: 18px;
    font-size: 20px;
    background: var(--accent);
    border: none;
    border-radius: 8px;
    color: #1a1200;
    font-weight: 800;
    letter-spacing: 1px;
    text-transform: uppercase;
    text-decoration: none;
    display: block;
    box-shadow: 0 8px 24px rgba(242,169,0,0.25);
}

.play-btn:hover { background: #ffbe1f; }

.logout-link {
    color: var(--text-dim);
    text-decoration: none;
    font-size: 13px;
}
.logout-link:hover { color: var(--danger); }