.nihilist-tool {
    --nihilist-sidebar-width: 320px;
    --nihilist-panel: #f8f8f9;
    --nihilist-panel-strong: #ffffff;
    --nihilist-line: #d8dbe0;
    --nihilist-line-strong: #c9ced6;
    --nihilist-text: #152033;
    --nihilist-muted: #687385;
    --nihilist-blue: #dbe7f5;
    --nihilist-blue-strong: #b8c6da;
    --nihilist-red: #f3e4e4;
    --nihilist-red-strong: #e9d3d3;
    --nihilist-green: #eef8ef;
    --nihilist-green-strong: #cfe2d1;
    --nihilist-hover-filter: brightness(0.97);
    --nihilist-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
    color: var(--nihilist-text);
    font-family: "Inter", var(--font-sans);
}

html[data-theme="dark"] .nihilist-tool {
    --nihilist-panel: #20242a;
    --nihilist-panel-strong: #252a31;
    --nihilist-line: #323944;
    --nihilist-line-strong: #424b58;
    --nihilist-text: #f1f5f9;
    --nihilist-muted: #a1adbd;
    --nihilist-blue: #213147;
    --nihilist-blue-strong: #39526f;
    --nihilist-red: #3a2528;
    --nihilist-red-strong: #684147;
    --nihilist-green: #203629;
    --nihilist-green-strong: #3f684c;
    --nihilist-hover-filter: brightness(1.1);
}

.nihilist-tool *,
.nihilist-tool *::before,
.nihilist-tool *::after {
    box-sizing: border-box;
}

.nihilist-tool .sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.tool-template.tool-template-nihilist-wide {
    max-width: min(1120px, calc(100vw - 56px));
}

.container.tool-page-container-nihilist-cipher {
    width: min(1180px, calc(100% - 48px));
}

.tool-template-nihilist-wide .tool-template-card {
    overflow: hidden;
}

.tool-template-nihilist-wide .tool-template-guide,
.tool-template-nihilist-wide .tool-template-learn-card,
.tool-template-nihilist-wide .tool-template-donation-banner {
    width: 100%;
    margin-right: auto;
    margin-left: auto;
}

.nihilist-shell {
    max-width: 100%;
    overflow: hidden;
    padding: 8px;
}

.nihilist-topbar,
.nihilist-actions,
.nihilist-io-head,
.nihilist-io-footer,
.nihilist-chips {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
}

.nihilist-topbar {
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 20px;
}

.nihilist-topbar .tool-topbar-start {
    width: fit-content;
    justify-self: start;
}

.nihilist-mode {
    display: inline-flex;
    flex: 0 0 auto;
    gap: 4px;
    padding: 5px;
    border: 1px solid var(--nihilist-line);
    border-radius: 999px;
    background: #f1f2f4;
}

html[data-theme="dark"] .nihilist-mode {
    background: #1c2026;
}

.nihilist-segment-btn {
    min-width: 0;
    min-height: 42px;
    padding: 10px 24px;
    border: 0;
    border-radius: 999px;
    background: transparent;
    color: #6f7786;
    cursor: pointer;
    font: inherit;
    font-size: 0.95rem;
    font-weight: 700;
    transition: background-color 0.18s ease, color 0.18s ease;
}

.nihilist-segment-btn[aria-pressed="true"] {
    background: var(--nihilist-blue);
    color: var(--nihilist-text);
    box-shadow: inset 0 0 0 1px rgba(180, 194, 214, 0.7);
}

.nihilist-actions {
    justify-content: flex-end;
    gap: 8px;
}

.nihilist-btn,
.nihilist-tool-btn,
.nihilist-mini-btn,
.nihilist-stepper-btn {
    border: 1px solid var(--nihilist-line);
    background: var(--nihilist-panel-strong);
    color: var(--nihilist-text);
    cursor: pointer;
    font: inherit;
    font-weight: 700;
    transition: background-color 0.16s ease, border-color 0.16s ease, filter 0.16s ease, opacity 0.16s ease;
}

.nihilist-btn {
    min-height: 40px;
    padding: 10px 16px;
    border-radius: 12px;
    font-size: 0.9rem;
    white-space: nowrap;
}

.nihilist-btn-danger {
    border-color: var(--nihilist-red-strong);
    background: var(--nihilist-red);
    color: #5e4848;
}

html[data-theme="dark"] .nihilist-btn-danger {
    color: #ffd7d7;
}

.nihilist-btn:hover,
.nihilist-tool-btn:hover,
.nihilist-mini-btn:hover,
.nihilist-stepper-btn:hover:not(:disabled) {
    border-color: var(--nihilist-line-strong);
    filter: var(--nihilist-hover-filter);
}

.nihilist-grid {
    display: grid;
    grid-template-columns: minmax(260px, var(--nihilist-sidebar-width)) minmax(0, 1fr);
    gap: 18px;
    align-items: start;
    min-width: 0;
}

.nihilist-sidebar {
    position: sticky;
    top: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    min-width: 0;
}

.nihilist-workspace {
    display: grid;
    gap: 20px;
    min-width: 0;
}

.nihilist-section,
.nihilist-io {
    min-width: 0;
    padding: 18px;
    border: 1px solid var(--nihilist-line);
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.72);
}

html[data-theme="dark"] .nihilist-section,
html[data-theme="dark"] .nihilist-io {
    background: rgba(32, 36, 42, 0.78);
}

.nihilist-section-title {
    margin: 0 0 14px;
    color: var(--nihilist-text);
    font-size: 0.95rem;
    font-weight: 800;
    line-height: 1.2;
}

.nihilist-collapse-toggle {
    display: contents;
    border: 0;
    background: transparent;
    color: inherit;
    cursor: default;
    font: inherit;
    text-align: left;
}

.nihilist-collapse-action,
.nihilist-collapse-icon {
    display: none;
}

.nihilist-control-stack,
.nihilist-field {
    display: grid;
    gap: 12px;
}

.nihilist-control-stack {
    gap: 16px;
}

.nihilist-label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    color: var(--nihilist-text);
    font-size: 0.82rem;
    font-weight: 800;
}

.nihilist-label > span:last-child {
    color: var(--nihilist-muted);
    font-family: var(--nihilist-mono);
    font-size: 0.72rem;
    font-weight: 600;
}

.nihilist-input,
.nihilist-io textarea {
    width: 100%;
    border: 1px solid var(--nihilist-line);
    background: var(--nihilist-panel-strong);
    color: var(--nihilist-text);
    font-family: var(--nihilist-mono);
}

.nihilist-input {
    min-height: 48px;
    padding: 11px 13px;
    border-radius: 12px;
    font-size: 0.88rem;
}

.nihilist-input:focus,
.nihilist-io textarea:focus {
    border-color: #91add3;
    outline: 3px solid rgba(83, 129, 193, 0.14);
}

.nihilist-help {
    margin: -5px 0 0;
    color: var(--nihilist-muted);
    font-size: 0.76rem;
    line-height: 1.45;
}

.nihilist-help code,
.nihilist-vector-note code,
.nihilist-formula-box code {
    font-family: var(--nihilist-mono);
}

.nihilist-tool-buttons {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
}

.nihilist-tool-btn {
    min-height: 42px;
    padding: 9px 10px;
    border-radius: 11px;
    font-size: 0.78rem;
}

.nihilist-tool-btn-primary {
    grid-column: 1 / -1;
    border-color: var(--nihilist-blue-strong);
    background: var(--nihilist-blue);
}

.nihilist-validation {
    padding: 10px 12px;
    border: 1px solid var(--nihilist-red-strong);
    border-radius: 12px;
    background: var(--nihilist-red);
    color: #6f4949;
    font-size: 0.77rem;
    font-weight: 700;
    line-height: 1.35;
}

.nihilist-validation.is-valid {
    border-color: var(--nihilist-green-strong);
    background: var(--nihilist-green);
    color: #45654d;
}

html[data-theme="dark"] .nihilist-validation {
    color: #ffd1d1;
}

html[data-theme="dark"] .nihilist-validation.is-valid {
    color: #b9e8c5;
}

.nihilist-option-list {
    display: grid;
    gap: 10px;
}

.nihilist-option-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    min-height: 42px;
    padding: 9px 10px;
    border: 1px solid var(--nihilist-line);
    border-radius: 12px;
    background: var(--nihilist-panel-strong);
}

.nihilist-option-left {
    display: flex;
    align-items: center;
    gap: 9px;
    min-width: 0;
    font-size: 0.8rem;
    font-weight: 700;
}

.nihilist-option-left input {
    width: 17px;
    height: 17px;
    margin: 0;
    accent-color: #6d8ebd;
}

.nihilist-stepper {
    display: inline-grid;
    grid-template-columns: 32px 34px 32px;
    align-items: center;
    border: 1px solid var(--nihilist-line);
    border-radius: 9px;
    overflow: hidden;
}

.nihilist-stepper.is-disabled {
    opacity: 0.45;
}

.nihilist-stepper-btn {
    min-height: 32px;
    padding: 0;
    border: 0;
    border-radius: 0;
}

.nihilist-stepper-btn:disabled {
    cursor: not-allowed;
}

.nihilist-stepper-value {
    text-align: center;
    font-family: var(--nihilist-mono);
    font-size: 0.78rem;
    font-weight: 800;
}

.nihilist-separator-row {
    align-items: center;
}

.nihilist-separator-row .nihilist-label {
    flex: 1 1 auto;
}

.nihilist-small-input {
    width: 72px;
    min-height: 34px;
    padding: 6px 8px;
    text-align: center;
}

.nihilist-options-help {
    margin-top: 12px;
}

.nihilist-io-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    align-items: stretch;
}

.nihilist-io {
    display: flex;
    flex-direction: column;
    padding: 16px;
}

.nihilist-io-head {
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 12px;
}

.nihilist-io-head h2 {
    margin: 0;
    font-size: 0.92rem;
    font-weight: 800;
}

.nihilist-mini-btn {
    min-height: 32px;
    padding: 6px 11px;
    border-radius: 999px;
    font-size: 0.75rem;
}

.nihilist-mini-btn:disabled {
    cursor: not-allowed;
    opacity: 0.42;
}

.nihilist-mini-btn.is-copied {
    border-color: var(--nihilist-green-strong);
    background: var(--nihilist-green);
}

.nihilist-mini-btn.is-failed {
    border-color: var(--nihilist-red-strong);
    background: var(--nihilist-red);
}

.tool-template.tool-template-nihilist-wide .nihilist-io textarea {
    flex: 1 1 auto;
    min-height: 360px;
    height: clamp(360px, 42vh, 520px);
    padding: 15px;
    resize: vertical;
    border-radius: 12px;
    font-size: 0.9rem;
    line-height: 1.6;
}

.nihilist-output {
    background: #fbfbfc;
}

html[data-theme="dark"] .nihilist-output {
    background: #1b2026;
}

.nihilist-io-footer {
    gap: 7px;
    margin-top: 10px;
    color: var(--nihilist-muted);
    font-size: 0.72rem;
}

.nihilist-io-footer strong {
    color: var(--nihilist-text);
}

.nihilist-formula-box {
    margin-bottom: 14px;
    padding: 11px 13px;
    border: 1px solid var(--nihilist-line);
    border-radius: 12px;
    background: var(--nihilist-panel);
    color: var(--nihilist-muted);
    font-size: 0.78rem;
    line-height: 1.5;
}

.nihilist-square-scroll,
.nihilist-preview-wrap {
    max-width: 100%;
    overflow-x: auto;
    scrollbar-width: thin;
}

.nihilist-square-scroll {
    width: min(100%, 600px);
    margin-right: auto;
    margin-left: auto;
}

.nihilist-square-grid {
    display: grid;
    grid-template-columns: 38px repeat(5, minmax(54px, 1fr));
    gap: 6px;
    min-width: 360px;
}

.nihilist-square-cell {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    min-height: 54px;
    padding: 5px;
    border: 1px solid var(--nihilist-line);
    border-radius: 10px;
    background: var(--nihilist-panel-strong);
    font-family: var(--nihilist-mono);
}

.nihilist-square-cell strong {
    font-size: 0.88rem;
}

.nihilist-square-cell span {
    color: var(--nihilist-muted);
    font-size: 0.65rem;
}

.nihilist-square-cell.is-header {
    min-height: 38px;
    border-color: transparent;
    background: transparent;
    color: var(--nihilist-muted);
    font-size: 0.72rem;
    font-weight: 800;
}

.nihilist-empty-state {
    margin: 0;
    padding: 18px;
    border: 1px dashed var(--nihilist-line-strong);
    border-radius: 12px;
    color: var(--nihilist-muted);
    font-size: 0.8rem;
    text-align: center;
}

.nihilist-preview-table {
    width: 100%;
    min-width: 610px;
    border-collapse: collapse;
    font-family: var(--nihilist-mono);
    font-size: 0.74rem;
}

.nihilist-preview-table th,
.nihilist-preview-table td {
    padding: 9px 10px;
    border-bottom: 1px solid var(--nihilist-line);
    text-align: left;
    white-space: nowrap;
}

.nihilist-preview-table th {
    color: var(--nihilist-muted);
    font-family: "Inter", var(--font-sans);
    font-size: 0.68rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.nihilist-properties-section {
    padding: 14px 16px;
}

.nihilist-properties-section .nihilist-section-title {
    margin-bottom: 10px;
    color: var(--nihilist-muted);
    font-size: 0.78rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.nihilist-chips {
    gap: 6px;
}

.nihilist-chip {
    gap: 4px;
    border-color: var(--nihilist-line);
}

.nihilist-vector-note {
    margin: 16px 2px 0;
    color: var(--nihilist-muted);
    font-size: 0.75rem;
    line-height: 1.5;
}

@media (min-width: 1101px) {
    .nihilist-topbar .tool-topbar-start {
        width: var(--nihilist-sidebar-width);
    }

    .nihilist-mode {
        width: 100%;
    }

    .nihilist-mode .nihilist-segment-btn {
        flex: 1 1 0;
        text-align: center;
    }
}

@media (max-width: 1100px) {
    .tool-template.tool-template-nihilist-wide .nihilist-io textarea {
        min-height: 300px;
        height: clamp(300px, 38vh, 460px);
    }

    .nihilist-grid {
        display: flex;
        flex-direction: column;
        align-items: stretch;
        gap: 18px;
    }

    .nihilist-sidebar,
    .nihilist-workspace {
        display: contents;
    }

    .nihilist-io-grid { order: 1; }
    .nihilist-config-section { order: 2; }
    .nihilist-options-section { order: 3; }
    .nihilist-square-section { order: 4; }
    .nihilist-preview-section { order: 5; }
    .nihilist-properties-section { order: 6; }

    .nihilist-topbar {
        justify-content: center;
    }

    .nihilist-topbar .tool-topbar-start,
    .nihilist-topbar .tool-topbar-end {
        display: flex;
        justify-content: center;
        width: auto;
        max-width: 100%;
    }
}

@media (max-width: 760px) {
    .tool-template.tool-template-nihilist-wide {
        max-width: min(100%, calc(100vw - 24px));
    }

    .container.tool-page-container-nihilist-cipher {
        width: min(100%, calc(100% - 24px));
    }

    .nihilist-shell {
        padding: 0;
    }

    .nihilist-topbar {
        align-items: stretch;
    }

    .nihilist-topbar .tool-topbar-start,
    .nihilist-topbar .tool-topbar-end,
    .nihilist-mode,
    .nihilist-actions {
        width: 100%;
    }

    .nihilist-mode .nihilist-segment-btn {
        flex: 1 1 0;
        text-align: center;
    }

    .nihilist-actions {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 7px;
    }

    .nihilist-actions .nihilist-btn {
        width: 100%;
        padding: 10px 8px;
    }

    .nihilist-io-grid {
        grid-template-columns: 1fr;
    }

    .nihilist-io-divider {
        display: none;
    }

    .tool-template.tool-template-nihilist-wide .nihilist-io textarea {
        min-height: 230px;
        height: clamp(230px, 36vh, 390px);
        resize: vertical;
    }

    .nihilist-collapse-toggle {
        display: flex;
        width: 100%;
        align-items: center;
        justify-content: space-between;
        gap: 12px;
        padding: 0;
        cursor: pointer;
    }

    .nihilist-collapse-action {
        display: inline-flex;
        align-items: center;
        gap: 7px;
        color: var(--nihilist-muted);
        font-size: 0.68rem;
        font-weight: 800;
        letter-spacing: 0.05em;
        text-transform: uppercase;
    }

    .nihilist-collapse-action-text::before {
        content: "Hide";
    }

    .nihilist-section.is-collapsed .nihilist-collapse-action-text::before {
        content: "Show";
    }

    .nihilist-collapse-icon {
        position: relative;
        display: inline-block;
        width: 22px;
        height: 22px;
        border: 1px solid var(--nihilist-line);
        border-radius: 50%;
    }

    .nihilist-collapse-icon::before,
    .nihilist-collapse-icon::after {
        content: "";
        position: absolute;
        top: 50%;
        left: 50%;
        width: 8px;
        height: 1.5px;
        background: currentColor;
        transform: translate(-50%, -50%);
    }

    .nihilist-collapse-icon::after {
        transform: translate(-50%, -50%) rotate(90deg);
        transition: opacity 0.16s ease;
    }

    .nihilist-section:not(.is-collapsed) .nihilist-collapse-icon::after {
        opacity: 0;
    }

    .nihilist-section.is-collapsed > [data-nihilist-collapsible-panel] {
        display: none;
    }

    .nihilist-section-title {
        margin-bottom: 12px;
    }

    .nihilist-section.is-collapsed .nihilist-section-title {
        margin-bottom: 0;
    }

    .nihilist-vector-note {
        overflow-wrap: anywhere;
    }
}

@media (max-width: 460px) {
    .nihilist-section,
    .nihilist-io {
        padding: 14px;
        border-radius: 14px;
    }

    .nihilist-tool-buttons {
        grid-template-columns: 1fr;
    }

    .nihilist-tool-btn-primary {
        grid-column: auto;
    }

    .nihilist-option-row {
        align-items: flex-start;
    }

    .nihilist-separator-row {
        align-items: center;
    }

    .nihilist-square-grid {
        grid-template-columns: 34px repeat(5, 48px);
        min-width: 304px;
    }

    .nihilist-square-cell {
        min-height: 49px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .nihilist-tool *,
    .nihilist-tool *::before,
    .nihilist-tool *::after {
        scroll-behavior: auto !important;
        transition: none !important;
    }
}