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

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

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

.railfence-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;
}

.railfence-panel,
.railfence-pill-row,
.railfence-status,
.railfence-textarea-header,
.railfence-rails-control {
    display: flex;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
}

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

.railfence-textarea-header {
    justify-content: space-between;
}

.railfence-button {
    border: 1px solid var(--railfence-border);
    background: var(--railfence-panel);
    color: var(--railfence-text);
    font-family: inherit;
}

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

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

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

.railfence-rails-control {
    justify-content: space-between;
    gap: 10px;
    min-height: 40px;
    min-width: 0;
    align-self: start;
}

.railfence-rails-stepper {
    display: grid;
    grid-template-columns: 46px minmax(64px, 72px) 46px;
    align-items: stretch;
    margin-left: auto;
    border: 1px solid var(--railfence-border);
    border-radius: 12px;
    overflow: hidden;
    background: var(--railfence-panel);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.railfence-rails-step-button {
    appearance: none;
    border: 0;
    background: #f7f9fb;
    color: var(--railfence-text);
    min-height: 44px;
    padding: 0;
    cursor: pointer;
    font-size: 24px;
    line-height: 1;
    font-weight: 700;
    font-family: inherit;
    transition: background 0.12s ease, color 0.12s ease, transform 0.04s ease;
}

.railfence-rails-step-button:active {
    transform: translateY(1px);
}

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

.railfence-rails-step-button:hover:not(:disabled) {
    background: #eef4fa;
}

.railfence-rails-step-button:first-child {
    border-right: 1px solid var(--railfence-border);
}

.railfence-rails-step-button:last-child {
    border-left: 1px solid var(--railfence-border);
}

.railfence-rails-input {
    width: 100%;
    min-width: 0;
    border: 0;
    border-radius: 0;
    padding: 0 10px;
    text-align: center;
    font-family: var(--railfence-mono);
    font-size: 18px;
    font-weight: 700;
    color: var(--railfence-text);
    background: var(--railfence-panel);
    outline: none;
    appearance: textfield;
    -moz-appearance: textfield;
}

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

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

.railfence-pill-row,
.railfence-status {
    gap: 8px;
}

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

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

.railfence-textarea {
    width: 100%;
    min-width: 0;
    min-height: 240px;
    resize: vertical;
    line-height: 1.45;
    padding: 10px 12px;
    border: 1px solid var(--railfence-border);
    border-radius: 12px;
    font-family: var(--railfence-mono);
    font-size: 14px;
    background: var(--railfence-panel);
    color: var(--railfence-text);
    outline: none;
    transition: border-color 0.12s ease, box-shadow 0.12s ease, background 0.12s ease;
}

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

.railfence-textarea:focus,
.railfence-rails-input:focus,
.railfence-button:focus-visible,
.railfence-rails-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;
}

.railfence-status {
    margin-top: 0;
    font-size: 13px;
    justify-content: flex-start;
    padding-top: 0;
    border-top: 0;
}

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

html[data-theme="dark"] .railfence-rails-step-button {
    background: #1c2128;
}

html[data-theme="dark"] .railfence-rails-step-button:hover:not(:disabled) {
    background: #232a33;
}

html[data-theme="dark"] .railfence-rails-step-button:disabled {
    background: #222831;
}

@media (max-width: 680px) {
    .railfence-rails-control {
        justify-content: flex-start;
        flex-wrap: wrap;
    }
}

@media (max-width: 560px) {
    .railfence-textarea {
        min-height: 220px;
    }
}