.cb-root {
    min-height: calc(100vh - var(--main-nav-height, 88px));
    min-height: calc(100dvh - var(--main-nav-height, 88px));
    padding-right: 16px;
    padding-bottom: 20px;
    padding-left: 16px;
    background:
        linear-gradient(90deg, rgba(239, 68, 68, 0.12) 0 16%, rgba(245, 158, 11, 0.12) 16% 32%, rgba(234, 179, 8, 0.12) 32% 48%, rgba(16, 185, 129, 0.12) 48% 64%, rgba(14, 165, 233, 0.12) 64% 80%, rgba(124, 58, 237, 0.12) 80% 100%),
        linear-gradient(180deg, #fffdfa 0%, #eff8ff 48%, #f7f2ff 100%);
    color: #111827;
    font-family: "NanumSquareRound", "Pretendard", "Noto Sans KR", sans-serif;
    overflow-x: hidden;
}

.cb-topbar,
.cb-control-band,
.cb-board,
.cb-bottom {
    width: min(1060px, 100%);
    margin-right: auto;
    margin-left: auto;
}

.cb-topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    padding: 14px;
    border: 2px solid rgba(17, 24, 39, 0.12);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.88);
    box-shadow: 0 14px 32px rgba(15, 23, 42, 0.12);
}

.cb-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 0;
}

.cb-mark {
    width: 54px;
    height: 54px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
    border-radius: 8px;
    background: conic-gradient(from 0deg, #ef4444, #f59e0b, #eab308, #22c55e, #06b6d4, #8b5cf6, #ef4444);
    color: #ffffff;
    font-size: 2rem;
    font-weight: 900;
    box-shadow: inset 0 0 0 3px rgba(255, 255, 255, 0.82), 0 10px 18px rgba(79, 70, 229, 0.22);
}

.cb-brand h1 {
    margin: 0;
    color: #0f172a;
    font-size: 1.7rem;
    font-weight: 900;
    line-height: 1.1;
    letter-spacing: 0;
}

.cb-brand p {
    margin: 5px 0 0;
    min-height: 1.2em;
    color: #475569;
    font-size: 0.95rem;
    font-weight: 800;
    letter-spacing: 0;
}

.cb-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 8px;
    flex-wrap: wrap;
}

.cb-button,
.cb-chip {
    min-height: 42px;
    border: 2px solid rgba(17, 24, 39, 0.12);
    border-radius: 8px;
    padding: 0 14px;
    background: #ffffff;
    color: #1f2937;
    font: inherit;
    font-size: 0.95rem;
    font-weight: 900;
    letter-spacing: 0;
    cursor: pointer;
    box-shadow: 0 7px 14px rgba(15, 23, 42, 0.08);
    transition: transform 0.14s ease, box-shadow 0.14s ease, border-color 0.14s ease, background-color 0.14s ease;
}

.cb-button:hover,
.cb-chip:hover {
    transform: translateY(-1px);
    box-shadow: 0 10px 18px rgba(15, 23, 42, 0.12);
}

.cb-button:active,
.cb-chip:active {
    transform: translateY(0);
}

.cb-button:focus-visible,
.cb-chip:focus-visible,
.cb-cell:focus-visible,
.cb-tempo input:focus-visible {
    outline: 3px solid #111827;
    outline-offset: 3px;
}

.cb-button-primary {
    border-color: #2563eb;
    background: #2563eb;
    color: #ffffff;
}

.cb-button-primary.is-playing {
    border-color: #dc2626;
    background: #dc2626;
}

.cb-button.is-active,
.cb-chip.is-active {
    border-color: #111827;
    background: #111827;
    color: #ffffff;
}

.cb-control-band {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-top: 12px;
    padding: 12px;
    border: 2px solid rgba(17, 24, 39, 0.1);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.76);
}

.cb-tempo {
    display: grid;
    grid-template-columns: auto minmax(160px, 260px) 48px;
    align-items: center;
    gap: 10px;
    color: #0f172a;
    font-size: 0.95rem;
    font-weight: 900;
}

.cb-tempo input {
    accent-color: #2563eb;
    width: 100%;
}

.cb-tempo output {
    min-width: 44px;
    border-radius: 8px;
    padding: 7px 8px;
    background: #e0f2fe;
    color: #075985;
    text-align: center;
}

.cb-sound-set {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.cb-board {
    margin-top: 12px;
    padding: 14px;
    border: 2px solid rgba(17, 24, 39, 0.12);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.88);
    box-shadow: 0 16px 38px rgba(15, 23, 42, 0.13);
}

.cb-step-labels,
.cb-grid {
    display: grid;
    grid-template-columns: minmax(56px, 76px) repeat(8, minmax(34px, 1fr));
    gap: 7px;
}

.cb-step-labels {
    margin-bottom: 7px;
}

.cb-step-labels span {
    min-height: 24px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    color: #64748b;
    font-size: 0.82rem;
    font-weight: 900;
}

.cb-track,
.cb-cell {
    min-height: 58px;
    border-radius: 8px;
}

.cb-track {
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    font-size: 1.2rem;
    font-weight: 900;
    box-shadow: inset 0 -3px 0 rgba(15, 23, 42, 0.18);
}

.cb-cell {
    position: relative;
    border: 2px solid rgba(15, 23, 42, 0.08);
    background: #f8fafc;
    cursor: pointer;
    touch-action: manipulation;
    box-shadow: inset 0 -3px 0 rgba(15, 23, 42, 0.08);
}

.cb-cell::after {
    content: "";
    position: absolute;
    inset: 11px;
    border-radius: 6px;
    background: rgba(148, 163, 184, 0.18);
    transform: scale(0.58);
    opacity: 0;
    transition: transform 0.14s ease, opacity 0.14s ease, background-color 0.14s ease;
}

.cb-cell.is-on::after {
    transform: scale(1);
    opacity: 1;
}

.cb-cell.is-current {
    border-color: #111827;
    box-shadow: inset 0 0 0 3px rgba(17, 24, 39, 0.14), 0 0 0 3px rgba(250, 204, 21, 0.8);
    animation: cb-pop 0.18s ease-out;
}

.cb-track-red,
.cb-cell-red.is-on::after {
    background: #ef4444;
}

.cb-track-orange,
.cb-cell-orange.is-on::after {
    background: #f97316;
}

.cb-track-yellow,
.cb-cell-yellow.is-on::after {
    background: #eab308;
}

.cb-track-cyan,
.cb-cell-cyan.is-on::after {
    background: #06b6d4;
}

.cb-bottom {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 10px;
    align-items: start;
    margin-top: 12px;
}

.cb-code {
    min-height: 42px;
    margin: 0;
    border: 2px solid rgba(17, 24, 39, 0.12);
    border-radius: 8px;
    padding: 11px 12px;
    background: #111827;
    color: #d1fae5;
    font-size: 0.9rem;
    line-height: 1.5;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
}

@keyframes cb-pop {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.04);
    }
    100% {
        transform: scale(1);
    }
}

@media (max-width: 760px) {
    .cb-root {
        padding-right: 10px;
        padding-left: 10px;
    }

    .cb-topbar,
    .cb-control-band,
    .cb-bottom {
        align-items: stretch;
        flex-direction: column;
    }

    .cb-actions,
    .cb-sound-set {
        justify-content: stretch;
    }

    .cb-actions .cb-button,
    .cb-sound-set .cb-chip {
        flex: 1 1 auto;
    }

    .cb-brand h1 {
        font-size: 1.35rem;
    }

    .cb-mark {
        width: 46px;
        height: 46px;
        font-size: 1.6rem;
    }

    .cb-tempo {
        grid-template-columns: auto minmax(120px, 1fr) 44px;
    }

    .cb-board {
        padding: 9px;
    }

    .cb-step-labels,
    .cb-grid {
        grid-template-columns: 44px repeat(8, minmax(26px, 1fr));
        gap: 4px;
    }

    .cb-track,
    .cb-cell {
        min-height: 42px;
    }

    .cb-track {
        font-size: 1rem;
    }

    .cb-cell::after {
        inset: 7px;
    }

    .cb-bottom {
        grid-template-columns: 1fr;
    }
}

@media (prefers-reduced-motion: reduce) {
    .cb-button,
    .cb-chip,
    .cb-cell::after,
    .cb-cell.is-current {
        animation: none;
        transition: none;
    }
}