/* ── Main ────────────────────────────────────────────────────────────────── */
.un-main {
    margin-top: 1rem;
}

/* ── How to Play ────────────────────────────────────────────────────────── */
.un-how-to {
    border: 1px solid rgba(0, 255, 255, 0.24);
    background: rgba(0, 255, 255, 0.04);
    padding: 1.2rem;
    margin-bottom: 1.2rem;
    border-radius: 2px;
}

.un-how-to h3 {
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--game-accent);
    margin: 0 0 0.8rem 0;
    font-size: 1rem;
}

.un-how-to ul {
    list-style: none;
    padding: 0;
    margin: 0;
    color: var(--game-text);
}

.un-how-to li {
    margin: 0.5rem 0;
    padding-left: 1.4rem;
    position: relative;
    line-height: 1.4;
}

.un-how-to li::before {
    content: "▪";
    position: absolute;
    left: 0;
    color: var(--game-accent);
}

/* ── Config ─────────────────────────────────────────────────────────────── */
.un-config {
    border: 1px solid rgba(0, 255, 255, 0.24);
    background: rgba(0, 255, 255, 0.04);
    padding: 1.2rem;
    margin-bottom: 1.2rem;
    border-radius: 2px;
}

.un-config h3 {
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--game-accent);
    margin: 0 0 1rem 0;
    font-size: 1rem;
}

.un-config-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.9rem;
    flex-wrap: wrap;
}

.un-config-row:last-of-type {
    margin-bottom: 0;
}

.un-config-row label {
    color: var(--game-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    font-size: 0.85rem;
    min-width: 160px;
    flex-shrink: 0;
}

.un-cfg-slider-wrap {
    display: flex;
    align-items: center;
    gap: 0.9rem;
    flex: 1;
    min-width: 180px;
}

.un-slider {
    -webkit-appearance: none;
    appearance: none;
    flex: 1;
    height: 4px;
    background: rgba(0, 255, 255, 0.2);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
}

.un-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--game-accent);
    border-radius: 50%;
    box-shadow: 0 0 8px rgba(0, 255, 255, 0.6);
    cursor: pointer;
}

.un-slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--game-accent);
    border: none;
    border-radius: 50%;
    box-shadow: 0 0 8px rgba(0, 255, 255, 0.6);
    cursor: pointer;
}

.un-cfg-val {
    font-family: "Barlow Condensed", sans-serif;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--game-accent);
    min-width: 3rem;
    text-align: right;
    flex-shrink: 0;
}

.un-cfg-options {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.un-cfg-btn {
    appearance: none;
    border: 1px solid rgba(0, 255, 255, 0.4);
    background: rgba(0, 0, 0, 0.5);
    color: var(--game-muted);
    padding: 0.35rem 0.9rem;
    font: inherit;
    font-size: 0.88rem;
    letter-spacing: 0.06em;
    cursor: pointer;
    text-transform: uppercase;
    transition: 120ms ease;
}

.un-cfg-btn:hover {
    border-color: var(--game-accent);
    color: var(--game-accent);
}

.un-cfg-btn.active {
    border-color: var(--game-accent);
    background: rgba(0, 255, 255, 0.12);
    color: var(--game-accent);
}

.un-config-note {
    margin: 1rem 0 0;
    color: var(--game-muted);
    font-size: 0.78rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

/* ── Card ───────────────────────────────────────────────────────────────── */
.un-card {
    border: 1px solid rgba(0, 255, 255, 0.28);
    background: rgba(3, 9, 9, 0.9);
    box-shadow: 0 0 30px rgba(0, 255, 255, 0.14);
    padding: 0.8rem;
}

.un-topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    border: 1px solid rgba(0, 255, 255, 0.2);
    background: rgba(0, 0, 0, 0.35);
    padding: 0.65rem 0.8rem;
    flex-wrap: wrap;
}

.un-title {
    font-family: "Barlow Condensed", sans-serif;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 1.8rem;
    color: var(--game-text);
}

.un-stats {
    display: flex;
    gap: 0.8rem;
    flex-wrap: wrap;
}

.un-stats span {
    border: 1px solid rgba(0, 255, 255, 0.32);
    background: rgba(0, 255, 255, 0.05);
    padding: 0.45rem 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--game-muted);
    font-size: 0.8rem;
    white-space: nowrap;
}

.un-stats strong {
    color: var(--game-accent);
}

.un-stats span.warn strong {
    color: var(--game-warning);
}

.un-stats span.solved strong {
    color: var(--game-success);
}

.un-instruction {
    margin-top: 0.7rem;
    border: 1px solid rgba(0, 255, 255, 0.2);
    background: rgba(0, 0, 0, 0.38);
    padding: 0.55rem;
    color: var(--game-muted);
    text-align: center;
    font-size: 0.82rem;
    letter-spacing: 0.05em;
}

/* ── Board (canvas wrapper) ─────────────────────────────────────────────── */
.un-board {
    position: relative;
    margin-top: 0.7rem;
    border: 1px solid rgba(0, 255, 255, 0.18);
    background: rgba(0, 0, 0, 0.55);
    height: clamp(340px, 44vw, 560px);
    overflow: hidden;
}

#gameCanvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
    cursor: default;
}

#gameCanvas.dragging {
    cursor: grabbing;
}

/* ── Responsive ─────────────────────────────────────────────────────────── */
@media (max-width: 640px) {
    .un-topbar {
        flex-direction: column;
        align-items: flex-start;
    }

    .un-title {
        font-size: 1.5rem;
    }

    .un-config-row label {
        min-width: 120px;
    }
}

    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

.un-header-zone {
    flex-shrink: 0;
    padding: 0 0.75rem;
}

.un-header-zone .game-header {
    max-width: 1220px;
    margin-inline: auto;
}

.un-arena {
    flex: 1;
    position: relative;
    overflow: hidden;
    margin: 0 0.75rem 0.75rem;
    border: 1px solid var(--game-border);
    background: rgba(3, 10, 10, 0.94);
    box-shadow: inset 0 0 60px rgba(0, 0, 0, 0.5);
}

#gameCanvas {
    display: block;
    width: 100%;
    height: 100%;
    cursor: default;
}

#gameCanvas.dragging {
    cursor: grabbing;
}


/* ── HUD ────────────────────────────────────────────────────────────────── */
.un-hud {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    display: none;
    justify-content: center;
    gap: 2.5rem;
    padding: 0.55rem 1rem;
    background: rgba(2, 6, 6, 0.76);
    border-bottom: 1px solid var(--game-border);
    backdrop-filter: blur(6px);
    pointer-events: none;
    z-index: 2;
}

.un-hud-item {
    font-size: 0.72rem;
    letter-spacing: 0.16em;
    color: var(--game-muted);
    text-transform: uppercase;
}

.un-hud-item span {
    color: var(--game-accent);
    font-family: "Barlow Condensed", sans-serif;
    font-size: 1.1rem;
    font-weight: 700;
    margin-left: 0.35rem;
}

.un-hud-time.warn span {
    color: var(--game-warning);
}

.un-hud-cross span {
    transition: color 0.2s;
}

.un-hud-cross.solved span {
    color: var(--game-success);
}


/* ── Status bar ─────────────────────────────────────────────────────────── */
.un-status {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 0.38rem 1rem;
    background: rgba(2, 6, 6, 0.72);
    border-top: 1px solid var(--game-border);
    color: var(--game-muted);
    font-size: 0.72rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    text-align: center;
    pointer-events: none;
    z-index: 2;
}


/* ── Start dialog ───────────────────────────────────────────────────────── */
.un-start-dialog {
    width: min(100% - 2rem, 460px);
    text-align: left;
}

.un-start-dialog h2 {
    margin: 0 0 0.4rem;
    font-size: 2.6rem;
    letter-spacing: 0.06em;
}

.un-dialog-desc {
    margin: 0 0 1.4rem;
    color: var(--game-muted);
    font-size: 0.88rem;
    letter-spacing: 0.05em;
    line-height: 1.5;
}


/* ── Config panel ───────────────────────────────────────────────────────── */
.un-config {
    border: 1px solid var(--game-border);
    padding: 1rem 1.1rem 0.85rem;
    margin-bottom: 1.4rem;
    background: rgba(0, 255, 255, 0.025);
}

.un-config-title {
    font-size: 0.68rem;
    letter-spacing: 0.22em;
    color: var(--game-muted);
    text-transform: uppercase;
    margin-bottom: 0.9rem;
}

.un-config-row {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    margin-bottom: 0.8rem;
}

.un-config-row:last-child {
    margin-bottom: 0;
}

.un-config-label {
    min-width: 120px;
    font-size: 0.78rem;
    color: var(--game-muted);
    letter-spacing: 0.07em;
    text-transform: uppercase;
    flex-shrink: 0;
}

.un-slider {
    -webkit-appearance: none;
    appearance: none;
    flex: 1;
    height: 4px;
    background: rgba(0, 255, 255, 0.18);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
}

.un-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    background: var(--game-accent);
    border-radius: 50%;
    box-shadow: 0 0 8px rgba(0, 255, 255, 0.55);
    cursor: pointer;
}

.un-slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: var(--game-accent);
    border: none;
    border-radius: 50%;
    box-shadow: 0 0 8px rgba(0, 255, 255, 0.55);
    cursor: pointer;
}

.un-config-val {
    min-width: 42px;
    text-align: right;
    font-family: "Barlow Condensed", sans-serif;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--game-accent);
    flex-shrink: 0;
}

.un-start-btn {
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.14em;
    padding: 0.85rem 2.5rem;
}


/* ── Mobile ─────────────────────────────────────────────────────────────── */
@media (max-width: 540px) {
    .un-hud {
        gap: 1.2rem;
    }

    .un-hud-item {
        font-size: 0.64rem;
    }

    .un-hud-item span {
        font-size: 0.95rem;
    }

    .un-config-label {
        min-width: 90px;
        font-size: 0.72rem;
    }

    .un-start-dialog h2 {
        font-size: 2rem;
    }
}

@media (max-width: 380px) {
    .un-hud {
        gap: 0.7rem;
        flex-wrap: wrap;
    }
}