.vigenere-tool {
        --vigenere-bg: #dddddd;
        --vigenere-card: #ffffff;
        --vigenere-panel: #ffffff;
        --vigenere-panel-soft: #fcfcfd;
        --vigenere-text: #101418;
        --vigenere-muted: #5a6872;
        --vigenere-border: #d8dee4;
        --vigenere-shadow: 0 12px 28px rgba(0, 0, 0, 0.08);
        --vigenere-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
        --vigenere-accent: #0b84ff;
        --vigenere-accent-soft: rgba(11, 132, 255, 0.1);
        --vigenere-danger: #d64545;
        --vigenere-danger-soft: rgba(214, 69, 69, 0.1);
        --vigenere-invalid-soft: rgba(214, 69, 69, 0.08);
        color: var(--vigenere-text);
        font-family: "Inter", var(--font-sans);
        padding-top: 0;
    }

    html[data-theme="dark"] .vigenere-tool {
        --vigenere-card: #181b1f;
        --vigenere-panel: #181b1f;
        --vigenere-panel-soft: #20242a;
        --vigenere-text: #f1f3f5;
        --vigenere-muted: #9aa2ab;
        --vigenere-border: #2a3037;
        --vigenere-shadow: 0 16px 34px rgba(0, 0, 0, 0.28);
        --vigenere-accent: #6ea8ff;
        --vigenere-accent-soft: rgba(110, 168, 255, 0.12);
        --vigenere-danger: #ff8f8f;
        --vigenere-danger-soft: rgba(95, 28, 28, 0.42);
        --vigenere-invalid-soft: rgba(95, 28, 28, 0.32);
    }

    .vigenere-tool * {
        box-sizing: border-box;
    }

    .vigenere-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;
    }

    .vigenere-topbar {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 12px;
        flex-wrap: wrap;
        margin-bottom: 14px;
    }

    .vigenere-mode {
        display: flex;
        gap: 8px;
        padding: 4px;
        border: 1px solid var(--vigenere-border);
        border-radius: 999px;
        background: var(--vigenere-panel);
    }

    .vigenere-mode button {
        border: 0;
        background: transparent;
        padding: 8px 12px;
        border-radius: 999px;
        font-weight: 600;
        color: var(--vigenere-muted);
        cursor: pointer;
        transition: background 0.12s ease, color 0.12s ease;
        min-height: 40px;
        font-family: inherit;
    }

    .vigenere-mode button[aria-pressed="true"] {
        background: var(--vigenere-accent-soft);
        color: var(--vigenere-text);
    }

    .vigenere-actions {
        display: flex;
        gap: 8px;
        flex-wrap: wrap;
        align-items: center;
    }

    .vigenere-button {
        border: 1px solid var(--vigenere-border);
        background: var(--vigenere-panel);
        padding: 9px 12px;
        border-radius: 10px;
        cursor: pointer;
        font-weight: 600;
        color: var(--vigenere-text);
        transition: transform 0.04s ease, border-color 0.12s ease, opacity 0.12s ease, background 0.12s ease;
        min-height: 40px;
        font-family: inherit;
    }

    .vigenere-button:active {
        transform: translateY(1px);
    }

    .vigenere-button-primary {
        border-color: rgba(11, 132, 255, 0.35);
        background: var(--vigenere-accent-soft);
    }

    .vigenere-button-danger {
        border-color: rgba(214, 69, 69, 0.35);
        background: var(--vigenere-danger-soft);
    }

    .vigenere-button[disabled] {
        opacity: 0.55;
        cursor: not-allowed;
    }

    .vigenere-controls,
    .vigenere-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 14px;
        align-items: stretch;
    }

    .vigenere-controls {
        margin-top: 10px;
    }

    .vigenere-field {
        display: flex;
        flex-direction: column;
        gap: 8px;
        min-width: 0;
    }

    .vigenere-textarea-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 12px;
    }

    .vigenere-section-label,
    .vigenere-field-label {
        display: block;
        font-size: 13px;
        color: var(--vigenere-muted);
        margin: 0;
    }

    .vigenere-copy-inline {
        min-height: 32px;
        padding: 0 12px;
        border-radius: 999px;
        font-size: 12px;
        line-height: 1;
        flex: 0 0 auto;
    }

    .vigenere-panel {
        padding: 14px;
        border: 1px solid var(--vigenere-border);
        border-radius: 12px;
        background: var(--vigenere-panel);
        display: flex;
        flex-direction: column;
        gap: 12px;
        height: 100%;
        min-width: 0;
    }

    .vigenere-input-wrap {
        display: flex;
        align-items: center;
        min-width: 0;
    }

    .vigenere-text,
    .vigenere-mini-input,
    .vigenere-textarea {
        width: 100%;
        min-width: 0;
        padding: 10px 12px;
        border: 1px solid var(--vigenere-border);
        border-radius: 12px;
        font-family: var(--vigenere-mono);
        font-size: 14px;
        background: var(--vigenere-panel);
        color: var(--vigenere-text);
        outline: none;
        transition: border-color 0.12s ease, box-shadow 0.12s ease, background 0.12s ease;
    }

    .vigenere-text.is-invalid {
        border-color: var(--vigenere-danger);
        background: var(--vigenere-invalid-soft);
    }

    .vigenere-mini-input {
        width: 56px;
        padding: 9px 8px;
        border-radius: 10px 0 0 10px;
        font-size: 13px;
        text-align: center;
        border-right: 0;
    }

    .vigenere-mini-input::-webkit-outer-spin-button,
    .vigenere-mini-input::-webkit-inner-spin-button {
        -webkit-appearance: none;
        margin: 0;
    }

    .vigenere-mini-input {
        appearance: textfield;
        -moz-appearance: textfield;
    }

    .vigenere-mini,
    .vigenere-hint {
        margin: 0;
        font-size: 12px;
        color: var(--vigenere-muted);
        line-height: 1.45;
    }

    .vigenere-hint {
        font-size: 13px;
        margin-top: 10px;
        line-height: 1.5;
    }

    .vigenere-mini strong,
    .vigenere-pill strong {
        color: var(--vigenere-text);
    }

    .vigenere-mini.vigenere-error {
        color: var(--vigenere-danger);
        font-weight: 600;
    }

    .vigenere-pill-row,
    .vigenere-status {
        display: flex;
        gap: 8px;
        flex-wrap: wrap;
        align-items: center;
    }

    .vigenere-pill {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        padding: 6px 10px;
        border: 1px solid var(--vigenere-border);
        border-radius: 999px;
        background: var(--vigenere-panel);
        font-size: 12px;
        color: var(--vigenere-muted);
        line-height: 1.2;
    }

    .vigenere-toggle-grid {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 10px 12px;
        align-items: start;
    }

    .vigenere-toggle {
        display: flex;
        align-items: center;
        gap: 8px;
        user-select: none;
        font-size: 13px;
        color: var(--vigenere-text);
        min-height: 40px;
        min-width: 0;
    }

    .vigenere-toggle.vigenere-disabled {
        opacity: 0.55;
        cursor: not-allowed;
    }

    .vigenere-toggle input {
        width: 16px;
        height: 16px;
        accent-color: var(--vigenere-accent);
        flex: 0 0 auto;
    }

    .vigenere-group-control {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 10px;
        min-height: 40px;
        min-width: 0;
        align-self: start;
    }

    .vigenere-block-stepper {
        display: flex;
        align-items: stretch;
        flex: 0 0 auto;
        margin-left: auto;
    }

    .vigenere-mini-stepper {
        display: flex;
        flex-direction: column;
        width: 28px;
    }

    .vigenere-mini-step-button {
        border: 1px solid var(--vigenere-border);
        background: var(--vigenere-panel);
        color: var(--vigenere-text);
        width: 28px;
        height: 21px;
        padding: 0;
        cursor: pointer;
        line-height: 1;
        font-size: 11px;
        font-weight: 700;
        transition: background 0.12s ease, border-color 0.12s ease, transform 0.04s ease;
    }

    .vigenere-mini-step-button:active {
        transform: translateY(1px);
    }

    .vigenere-mini-step-button:first-child {
        border-radius: 0 10px 0 0;
    }

    .vigenere-mini-step-button:last-child {
        border-top: 0;
        border-radius: 0 0 10px 0;
    }

    .vigenere-mini-step-button:disabled {
        opacity: 0.55;
        cursor: not-allowed;
        background: #f3f5f7;
    }

    html[data-theme="dark"] .vigenere-tool .vigenere-mini-step-button:disabled {
        background: #20242a;
    }

    .vigenere-grid {
        margin-top: 14px;
    }

    .vigenere-textarea {
        min-height: 240px;
        resize: vertical;
        line-height: 1.45;
    }

    .vigenere-textarea[readonly] {
        background: var(--vigenere-panel-soft);
    }

    .vigenere-textarea:focus,
    .vigenere-text:focus,
    .vigenere-mini-input:focus,
    .vigenere-button:focus-visible,
    .vigenere-mode button:focus-visible,
    .vigenere-mini-step-button:focus-visible {
        border-color: rgba(11, 132, 255, 0.55);
        box-shadow: 0 0 0 3px rgba(11, 132, 255, 0.1);
        outline: none;
    }

    html[data-theme="dark"] .vigenere-tool .vigenere-textarea:focus,
    html[data-theme="dark"] .vigenere-tool .vigenere-text:focus,
    html[data-theme="dark"] .vigenere-tool .vigenere-mini-input:focus,
    html[data-theme="dark"] .vigenere-tool .vigenere-button:focus-visible,
    html[data-theme="dark"] .vigenere-tool .vigenere-mode button:focus-visible,
    html[data-theme="dark"] .vigenere-tool .vigenere-mini-step-button:focus-visible {
        border-color: rgba(110, 168, 255, 0.55);
        box-shadow: 0 0 0 3px rgba(110, 168, 255, 0.12);
    }

    .vigenere-status {
        margin-top: 12px;
        font-size: 13px;
        justify-content: flex-start;
        padding-top: 10px;
        border-top: 1px solid rgba(216, 222, 228, 0.7);
    }

    html[data-theme="dark"] .vigenere-tool .vigenere-status {
        border-top-color: rgba(42, 48, 55, 0.9);
    }

    .vigenere-hint code,
    .vigenere-field-label code,
    .vigenere-mini code,
    .vigenere-pill code {
        font-family: var(--vigenere-mono);
        font-size: 12px;
        padding: 2px 6px;
        border: 1px solid var(--vigenere-border);
        border-radius: 8px;
        background: var(--vigenere-panel);
        color: var(--vigenere-text);
    }

    @media (max-width: 860px) {
        .vigenere-controls,
        .vigenere-grid {
            grid-template-columns: 1fr;
        }
    }

    @media (max-width: 680px) {
        .vigenere-toggle-grid {
            grid-template-columns: 1fr;
        }

        .vigenere-group-control {
            justify-content: flex-start;
            flex-wrap: wrap;
        }
    }

    @media (max-width: 560px) {
        .vigenere-tool {
            padding-top: 0;
        }

        .vigenere-title {
            margin-bottom: 16px;
            padding-left: 0;
        }

        .vigenere-title h2 {
            font-size: 24px;
        }

        .vigenere-card {
            padding: 14px;
        }

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

        .vigenere-mode,
        .vigenere-actions {
            width: 100%;
        }

        .vigenere-mode button {
            flex: 1 1 0;
        }

        .vigenere-actions .vigenere-button {
            flex: 1 1 calc(50% - 8px);
        }

        .vigenere-group-control {
            align-items: flex-start;
        }

        .vigenere-textarea {
            min-height: 220px;
        }
    }

    @media (max-width: 420px) {
        .vigenere-actions .vigenere-button {
            flex: 1 1 100%;
        }

        .vigenere-copy-inline {
            padding: 0 10px;
        }
    }