.centering-page {
    padding-top: 32px;
}

.centering-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(260px, 0.8fr);
    gap: 28px;
    align-items: start;
    margin-bottom: 48px;
}

.centering-drop {
    border: 1px dashed var(--color-line);
    border-radius: var(--radius-md);
    background: var(--color-bg-soft);
    min-height: 320px;
    overflow: hidden;
}

.centering-drop[data-empty="1"] {
    display: flex;
    align-items: center;
    justify-content: center;
}

.centering-drop.is-drag {
    border-color: var(--color-primary);
    background: rgba(239, 68, 68, 0.06);
}

.centering-quota {
    margin: 0 0 10px;
    font-size: 13px;
    font-weight: 600;
    color: var(--color-muted);
}

.centering-quota strong {
    color: var(--color-primary);
    font-weight: 800;
}

.centering-gate {
    text-align: center;
    padding: 40px 24px;
    max-width: 440px;
    margin: 0 auto;
}

.centering-gate-title {
    font-size: 18px;
    font-weight: 800;
    color: var(--color-ink);
    margin: 0 0 8px;
}

.centering-gate-lead {
    color: var(--color-muted);
    font-size: 14px;
    margin: 0 0 20px;
}

.centering-gate-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
}

.centering-drop-empty {
    text-align: center;
    padding: 40px 24px;
    max-width: 420px;
}

.centering-drop-title {
    font-size: 18px;
    font-weight: 800;
    color: var(--color-ink);
    margin: 0 0 8px;
}

.centering-drop-hint {
    color: var(--color-muted);
    font-size: 14px;
    margin: 0 0 20px;
}

.centering-drop-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
}

.centering-stage-wrap {
    position: relative;
    background: #111827;
}

.centering-stage {
    position: relative;
    width: 100%;
    min-height: 280px;
    max-height: min(72vh, 760px);
    touch-action: none;
    user-select: none;
}

.centering-stage canvas {
    display: block;
    width: 100%;
    height: auto;
    max-height: min(72vh, 760px);
    margin: 0 auto;
}

.centering-rect {
    position: absolute;
    box-sizing: border-box;
    pointer-events: auto;
}

.centering-rect.is-outer {
    border: 2px solid #fbbf24;
    box-shadow: 0 0 0 9999px rgba(0, 0, 0, 0.28);
    z-index: 2;
}

.centering-rect.is-inner {
    border: 2px solid #38bdf8;
    background: rgba(56, 189, 248, 0.06);
    z-index: 3;
}

.centering-rect.is-active {
    z-index: 4;
}

.centering-box-tag {
    position: absolute;
    left: 8px;
    top: -22px;
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.02em;
    color: #fff;
    background: rgba(17, 24, 39, 0.85);
    padding: 2px 8px;
    border-radius: 999px;
    pointer-events: none;
    white-space: nowrap;
}

.centering-rect.is-inner .centering-box-tag {
    top: auto;
    bottom: -22px;
}

.centering-side-label {
    position: absolute;
    font-size: 12px;
    font-weight: 800;
    color: #fff;
    background: rgba(17, 24, 39, 0.78);
    padding: 2px 6px;
    border-radius: 6px;
    pointer-events: none;
    z-index: 5;
}

.centering-side-label[data-side="l"] {
    left: 0;
    top: 50%;
    transform: translate(-50%, -50%);
}

.centering-side-label[data-side="r"] {
    right: 0;
    top: 50%;
    transform: translate(50%, -50%);
}

.centering-side-label[data-side="t"] {
    top: 0;
    left: 50%;
    transform: translate(-50%, -50%);
}

.centering-side-label[data-side="b"] {
    bottom: 0;
    left: 50%;
    transform: translate(-50%, 50%);
}

.centering-handle {
    position: absolute;
    width: 16px;
    height: 16px;
    padding: 0;
    border: 2px solid #111827;
    border-radius: 50%;
    background: #fff;
    z-index: 6;
    transform: translate(-50%, -50%);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.25);
}

.centering-handle::after {
    content: "";
    position: absolute;
    inset: -12px;
}

.centering-handle[data-h="nw"] { left: 0; top: 0; cursor: nwse-resize; }
.centering-handle[data-h="n"]  { left: 50%; top: 0; cursor: ns-resize; }
.centering-handle[data-h="ne"] { left: 100%; top: 0; cursor: nesw-resize; }
.centering-handle[data-h="e"]  { left: 100%; top: 50%; cursor: ew-resize; }
.centering-handle[data-h="se"] { left: 100%; top: 100%; cursor: nwse-resize; }
.centering-handle[data-h="s"]  { left: 50%; top: 100%; cursor: ns-resize; }
.centering-handle[data-h="sw"] { left: 0; top: 100%; cursor: nesw-resize; }
.centering-handle[data-h="w"]  { left: 0; top: 50%; cursor: ew-resize; }

.centering-rect.is-outer .centering-handle {
    background: #fbbf24;
}

.centering-rect.is-inner .centering-handle {
    background: #38bdf8;
}

.centering-status {
    margin: 10px 0 0;
    font-size: 13px;
    color: var(--color-muted);
}

.centering-status.is-error {
    color: #b91c1c;
}

.centering-toolbar {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    margin-top: 12px;
}

.centering-toolbar-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
    justify-content: space-between;
}

.centering-nudge {
    border: 1px solid var(--color-line);
    border-radius: var(--radius-sm);
    background: var(--color-bg-soft);
    padding: 10px 12px;
}

.centering-nudge-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 8px;
    font-size: 13px;
    font-weight: 700;
    color: var(--color-ink);
}

.centering-nudge-step {
    display: inline-flex;
    border: 1px solid var(--color-line);
    border-radius: 999px;
    overflow: hidden;
    background: #fff;
}

.centering-nudge-step-btn {
    height: 28px;
    padding: 0 10px;
    font-size: 12px;
    font-weight: 700;
    color: var(--color-muted);
}

.centering-nudge-step-btn.is-active {
    background: var(--color-ink);
    color: #fff;
}

.centering-nudge-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px 16px;
}

.centering-nudge-row {
    display: flex;
    align-items: center;
    gap: 6px;
}

.centering-nudge-row span {
    width: 3.2em;
    font-size: 12px;
    font-weight: 700;
    color: var(--color-muted);
}

.centering-nudge-btn {
    width: 36px;
    height: 32px;
    border: 1px solid var(--color-line);
    border-radius: 8px;
    background: #fff;
    font-size: 14px;
    font-weight: 700;
    color: var(--color-ink);
}

.centering-nudge-btn:active {
    background: var(--color-ink);
    color: #fff;
}

.centering-stage-wrap[hidden],
.centering-toolbar[hidden],
.centering-status[hidden],
.centering-result-body[hidden],
.centering-rect[hidden],
.centering-drop-empty[hidden],
.centering-gate[hidden],
.centering-quota[hidden],
.centering-live-grade[hidden] {
    display: none !important;
}

.centering-mode {
    display: inline-flex;
    border: 1px solid var(--color-line);
    border-radius: 999px;
    overflow: hidden;
    background: #fff;
}

.centering-mode-btn {
    height: 36px;
    padding: 0 14px;
    font-size: 13px;
    font-weight: 700;
    color: var(--color-muted);
}

.centering-mode-btn.is-active {
    background: var(--color-ink);
    color: #fff;
}

.centering-toolbar-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.centering-toolbar .btn-sm {
    height: 36px;
    padding: 0 12px;
    font-size: 13px;
}

.centering-result-card {
    border: 1px solid var(--color-line);
    border-radius: var(--radius-md);
    padding: 20px;
    background: var(--color-bg-card);
    margin-bottom: 16px;
}

.centering-result-placeholder {
    margin: 0;
    color: var(--color-muted);
    font-size: 14px;
}

.centering-ratio-row {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 12px;
}

.centering-ratio-label {
    font-size: 13px;
    font-weight: 700;
    color: var(--color-muted);
}

.centering-ratio-value {
    font-size: 28px;
    font-weight: 800;
    color: var(--color-ink);
    letter-spacing: -0.03em;
    font-variant-numeric: tabular-nums;
}

.centering-live-grade {
    position: absolute;
    left: 12px;
    bottom: 12px;
    z-index: 8;
    margin: 0;
    padding: 8px 12px;
    max-width: calc(100% - 24px);
    background: rgba(17, 24, 39, 0.9);
    color: #fff;
    font-size: 15px;
    font-weight: 800;
    line-height: 1.3;
    border-radius: 10px;
    pointer-events: none;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.28);
}

.centering-grade {
    margin: 0 0 16px;
    padding: 0 0 16px;
    border-bottom: 1px solid var(--color-line);
}

.centering-grade-kicker {
    display: block;
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-primary);
    margin-bottom: 4px;
}

.centering-grade strong {
    display: block;
    font-size: 22px;
    margin: 0 0 8px;
    line-height: 1.3;
}

.centering-grade p {
    margin: 0;
    font-size: 13px;
    color: var(--color-muted);
}

.centering-howto {
    border: 1px solid var(--color-line);
    border-radius: var(--radius-md);
    padding: 20px;
    background: var(--color-bg-soft);
}

.centering-howto h2 {
    font-size: 16px;
    margin: 0 0 12px;
}

.centering-howto ol {
    margin: 0 0 12px;
    padding-left: 20px;
}

.centering-howto li {
    margin: 0 0 8px;
    font-size: 14px;
    color: var(--color-body);
}

.centering-howto p {
    margin: 0;
    font-size: 13px;
    color: var(--color-muted);
}

.centering-ref-lead {
    color: var(--color-muted);
    max-width: 720px;
}

.centering-ref-btn {
    width: 100%;
    margin: 0;
    font: inherit;
    text-align: left;
    cursor: pointer;
    color: inherit;
    appearance: none;
    -webkit-appearance: none;
}

.centering-ref-btn.is-on {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-sm);
    background: rgba(239, 68, 68, 0.04);
}

@media (max-width: 900px) {
    .centering-layout {
        grid-template-columns: 1fr;
    }

    .centering-ratio-value {
        font-size: 24px;
    }
}

@media (max-width: 640px) {
    .centering-drop {
        min-height: 240px;
    }

    .centering-handle {
        width: 18px;
        height: 18px;
    }
}