.c4-wrap {
    max-width: 560px;
    margin: 0 auto;
    font-family: Inter, Arial, sans-serif;
    color: var(--cg-ink);
}

.c4-topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 10px;
    flex-wrap: wrap;
}

.c4-stats {
    display: flex;
    gap: 8px;
}

.c4-stat {
    background: var(--cg-panel);
    border: 1px solid var(--cg-line);
    border-radius: 8px;
    padding: 6px 12px;
    text-align: center;
    min-width: 62px;
}

.c4-stat span {
    display: block;
    color: var(--cg-muted);
    font-size: 0.68rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.c4-stat strong {
    font-size: 1.05rem;
}

.c4-actions {
    display: flex;
    gap: 8px;
}

.c4-icon-btn {
    width: 40px;
    height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--cg-line);
    border-radius: 8px;
    background: var(--cg-panel);
    color: var(--cg-ink);
    font-size: 1.05rem;
    font-weight: 800;
    cursor: pointer;
}

.c4-icon-btn svg {
    width: 22px;
    height: 22px;
}

.c4-icon-btn:hover {
    border-color: var(--cg-teal);
    color: var(--cg-teal);
}

.c4-modebar {
    display: flex;
    gap: 8px;
    margin-bottom: 10px;
}

.c4-mode-btn {
    flex: 1;
    padding: 9px 10px;
    border: 1px solid var(--cg-line);
    border-radius: 8px;
    background: var(--cg-panel);
    color: var(--cg-muted);
    font-weight: 800;
    font-size: 0.9rem;
    cursor: pointer;
}

.c4-mode-btn.c4-mode-on {
    background: var(--cg-ink);
    border-color: var(--cg-ink);
    color: #fff;
}

.c4-score {
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 10px;
    font-size: 0.92rem;
    font-weight: 700;
}

.c4-tag {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    background: var(--cg-panel);
    border: 1px solid var(--cg-line);
    border-radius: 999px;
    padding: 5px 13px;
}

.c4-tag i {
    width: 13px;
    height: 13px;
    border-radius: 50%;
    display: inline-block;
}

.c4-tag-p1 i {
    background: var(--cg-red);
}

.c4-tag-p2 i {
    background: var(--cg-amber);
}

.c4-tag-d {
    color: var(--cg-muted);
}

.c4-tag b {
    font-size: 1rem;
}

.c4-board {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 6px;
    background: var(--cg-blue);
    border-radius: 14px;
    padding: 10px;
    box-shadow: var(--cg-shadow);
    overflow: hidden;
}

.c4-col {
    display: grid;
    grid-template-rows: repeat(6, 1fr);
    gap: 6px;
    background: none;
    border: none;
    padding: 4px;
    margin: 0;
    border-radius: 10px;
    cursor: pointer;
    transition: background 0.12s ease;
}

.c4-col:hover,
.c4-col:focus-visible,
.c4-col.c4-cur {
    background: rgba(255, 255, 255, 0.16);
    outline: none;
}

.c4-board.c4-done .c4-col {
    cursor: default;
}

.c4-cell {
    position: relative;
    aspect-ratio: 1;
    border-radius: 50%;
    background: var(--cg-bg);
    box-shadow: inset 0 2px 5px rgba(20, 34, 60, 0.35);
}

.c4-disc {
    position: absolute;
    inset: 6%;
    border-radius: 50%;
    animation: c4drop 300ms cubic-bezier(0.5, 0, 0.9, 1) both;
}

.c4-p1 {
    background: radial-gradient(circle at 34% 30%, #e0655f, var(--cg-red) 62%, #8e2a26);
}

.c4-p2 {
    background: radial-gradient(circle at 34% 30%, #eeb356, var(--cg-amber) 62%, #93590e);
}

.c4-disc.c4-win {
    animation: c4pulse 0.9s ease-in-out infinite;
    box-shadow: 0 0 0 3px #fff, 0 0 14px 4px rgba(255, 255, 255, 0.75);
}

.c4-board.c4-done .c4-disc:not(.c4-win) {
    filter: saturate(0.55) brightness(0.9);
}

@keyframes c4drop {
    from {
        transform: translateY(calc(var(--c4-rows, 1) * -112%));
    }

    to {
        transform: translateY(0);
    }
}

@keyframes c4pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.09);
    }
}

.c4-col.c4-shake {
    animation: c4shake 0.3s ease;
}

@keyframes c4shake {

    0%,
    100% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-4px);
    }

    75% {
        transform: translateX(4px);
    }
}

.c4-status {
    min-height: 1.5em;
    margin-top: 12px;
    text-align: center;
    font-weight: 800;
    font-size: 1.02rem;
}

.c4-hint {
    margin-top: 6px;
    text-align: center;
    color: var(--cg-muted);
    font-size: 0.8rem;
}

.c4-overlay {
    position: fixed;
    inset: 0;
    background: rgba(20, 28, 26, 0.55);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 18px;
    z-index: 60;
}

.c4-overlay[hidden] {
    display: none;
}

.c4-dialog {
    position: relative;
    background: var(--cg-panel);
    color: var(--cg-ink);
    border-radius: 12px;
    padding: 22px 24px;
    max-width: 430px;
    width: 100%;
    box-shadow: var(--cg-shadow);
}

.c4-dialog h2 {
    margin: 0 0 10px;
    font-size: 1.2rem;
}

.c4-dialog p {
    margin: 0 0 10px;
    font-size: 0.94rem;
    line-height: 1.5;
    color: var(--cg-muted);
}

.c4-dialog p strong {
    color: var(--cg-ink);
}

.c4-close {
    position: absolute;
    top: 8px;
    right: 10px;
    width: 34px;
    height: 34px;
    border: none;
    background: none;
    color: var(--cg-muted);
    font-size: 1.5rem;
    cursor: pointer;
    line-height: 1;
}

.c4-close:hover {
    color: var(--cg-ink);
}

@media (max-width: 640px) {
    .c4-topbar {
        gap: 8px;
    }

    .c4-stat {
        min-width: 52px;
        padding: 5px 8px;
    }

    .c4-stat strong {
        font-size: 0.95rem;
    }

    .c4-icon-btn {
        width: 36px;
        height: 36px;
    }

    .c4-board {
        gap: 4px;
        padding: 7px;
        border-radius: 11px;
    }

    .c4-col {
        gap: 4px;
        padding: 3px;
    }

    .c4-score {
        gap: 6px;
        font-size: 0.84rem;
    }

    .c4-tag {
        padding: 4px 10px;
    }

    .c4-hint {
        font-size: 0.74rem;
    }
}