.arc-tool {
    --arc-ink: #152033;
    --arc-muted: #667085;
    --arc-line: #d8e1ea;
    --arc-soft: #f4f8fb;
    --arc-card: #ffffff;
    --arc-primary: #0f6fae;
    --arc-primary-dark: #0a4f7c;
    --arc-accent: #0b8f82;
    --arc-accent-soft: #e6f7f4;
    --arc-warn: #b7791f;
    --arc-danger: #c0392b;
    --arc-shadow: 0 18px 42px rgba(21, 32, 51, .10);
    color: var(--arc-ink);
    width: 100%;
}

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

.arc-tool button,
.arc-tool input,
.arc-tool select,
.arc-tool textarea {
    font: inherit;
}

.arc-panel {
    background:
        linear-gradient(135deg, rgba(15, 111, 174, .06), rgba(11, 143, 130, .05)),
        #fff;
    border: 1px solid var(--arc-line);
    border-radius: 8px;
    box-shadow: var(--arc-shadow);
}

.arc-workbench {
    display: grid;
    gap: 16px;
    padding: 18px;
}

.arc-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    border: 1px solid rgba(15, 111, 174, .15);
    background: rgba(255, 255, 255, .78);
    border-radius: 8px;
    padding: 12px;
}

.arc-status {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    min-width: 0;
    color: #24405a;
    font-weight: 700;
}

.arc-status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--arc-accent);
    box-shadow: 0 0 0 5px rgba(11, 143, 130, .12);
    flex: 0 0 auto;
}

.arc-toolbar-actions,
.arc-action-row,
.arc-output-actions,
.arc-file-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
}

.arc-mode-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 10px;
}

.arc-mode {
    min-height: 58px;
    border: 1px solid var(--arc-line);
    border-radius: 8px;
    background: #fff;
    color: #12314d;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 9px;
    font-weight: 800;
    transition: background .18s ease, border-color .18s ease, transform .18s ease, box-shadow .18s ease;
}

.arc-mode i {
    color: var(--arc-primary);
    font-size: 18px;
}

.arc-mode:hover {
    border-color: rgba(15, 111, 174, .44);
    transform: translateY(-1px);
}

.arc-mode.active {
    color: #fff;
    border-color: var(--arc-primary);
    background: linear-gradient(135deg, var(--arc-primary), var(--arc-accent));
    box-shadow: 0 12px 28px rgba(15, 111, 174, .20);
}

.arc-mode.active i {
    color: #fff;
}

.arc-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.14fr) minmax(340px, .86fr);
    gap: 16px;
    align-items: start;
}

.arc-left,
.arc-right,
.arc-batch-results {
    background: var(--arc-card);
    border: 1px solid var(--arc-line);
    border-radius: 8px;
}

.arc-left {
    padding: 16px;
}

.arc-right {
    display: grid;
    gap: 12px;
    padding: 14px;
    position: sticky;
    top: 12px;
}

.arc-view {
    display: none;
}

.arc-view.active {
    display: grid;
    gap: 16px;
}

.arc-step-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    border-bottom: 1px solid #edf2f6;
    padding-bottom: 13px;
}

.arc-step-head b {
    display: block;
    font-size: 18px;
    line-height: 1.35;
    margin-bottom: 4px;
}

.arc-step-head span {
    display: block;
    color: var(--arc-muted);
    font-size: 13px;
    line-height: 1.55;
}

.arc-methods {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
}

.arc-method {
    border: 1px solid var(--arc-line);
    border-radius: 8px;
    background: #fff;
    padding: 12px;
    cursor: pointer;
    min-height: 76px;
    display: flex;
    align-items: flex-start;
    gap: 10px;
    transition: border-color .18s ease, background .18s ease, box-shadow .18s ease;
}

.arc-method input {
    margin-top: 4px;
    accent-color: var(--arc-primary);
}

.arc-method b {
    display: block;
    color: #12273b;
    font-size: 14px;
    line-height: 1.35;
}

.arc-method small {
    display: block;
    color: var(--arc-muted);
    font-size: 12px;
    line-height: 1.45;
    margin-top: 4px;
}

.arc-method.active {
    border-color: var(--arc-primary);
    background: #eef8fc;
    box-shadow: 0 10px 24px rgba(15, 111, 174, .12);
}

.arc-preset-row {
    display: flex;
    flex-wrap: wrap;
    gap: 9px;
}

.arc-preset-row button {
    border: 1px solid rgba(11, 143, 130, .25);
    background: var(--arc-accent-soft);
    color: #075f58;
    border-radius: 999px;
    padding: 8px 12px;
    font-weight: 800;
    cursor: pointer;
}

.arc-form-grid,
.arc-batch-config {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 13px;
}

.arc-batch-config {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.arc-field {
    display: grid;
    gap: 7px;
    color: #21364d;
    font-weight: 800;
}

.arc-field > span {
    font-size: 13px;
}

.arc-field.compact {
    align-content: start;
}

.arc-input-unit {
    display: flex;
    min-width: 0;
}

.arc-input-unit input,
.arc-field select,
.arc-field textarea {
    width: 100%;
    border: 1px solid #cfd9e5;
    background: #fff;
    color: var(--arc-ink);
    border-radius: 8px;
    padding: 10px 11px;
    outline: none;
    transition: border-color .18s ease, box-shadow .18s ease;
}

.arc-input-unit input {
    border-radius: 8px 0 0 8px;
    min-width: 0;
}

.arc-input-unit select,
.arc-unit-note {
    width: auto;
    min-width: 92px;
    border: 1px solid #cfd9e5;
    border-left: 0;
    border-radius: 0 8px 8px 0;
    background: #f7fafc;
    color: #35516c;
    padding: 10px 9px;
    font-weight: 800;
}

.arc-unit-note {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    white-space: nowrap;
}

.arc-field textarea {
    min-height: 170px;
    resize: vertical;
    font-family: Consolas, "Courier New", monospace;
    font-size: 13px;
    line-height: 1.55;
}

.arc-input-unit input:focus,
.arc-field select:focus,
.arc-field textarea:focus {
    border-color: var(--arc-primary);
    box-shadow: 0 0 0 4px rgba(15, 111, 174, .12);
}

.arc-options-row {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    align-items: end;
}

.arc-options-row .compact {
    width: min(180px, 100%);
}

.arc-toggle {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-height: 42px;
    color: #24405a;
    font-weight: 800;
}

.arc-toggle input {
    width: 18px;
    height: 18px;
    accent-color: var(--arc-primary);
}

.arc-primary-btn,
.arc-secondary-btn,
.arc-ghost-btn,
.arc-next-btn {
    border: 0;
    border-radius: 8px;
    padding: 10px 14px;
    min-height: 42px;
    font-weight: 900;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    transition: transform .18s ease, box-shadow .18s ease, background .18s ease, border-color .18s ease;
}

.arc-primary-btn {
    background: linear-gradient(135deg, var(--arc-primary), var(--arc-accent));
    color: #fff;
    box-shadow: 0 12px 26px rgba(15, 111, 174, .20);
}

.arc-secondary-btn {
    border: 1px solid #cfd9e5;
    background: #fff;
    color: #18324d;
}

.arc-ghost-btn {
    border: 1px solid rgba(15, 111, 174, .22);
    background: #f6fbfd;
    color: var(--arc-primary-dark);
}

.arc-ghost-btn.small {
    min-height: 34px;
    padding: 7px 10px;
    font-size: 12px;
}

.arc-next-btn {
    flex: 0 0 auto;
    background: #e8f3fa;
    color: var(--arc-primary-dark);
    border: 1px solid rgba(15, 111, 174, .22);
}

.arc-primary-btn:hover,
.arc-secondary-btn:hover,
.arc-ghost-btn:hover,
.arc-next-btn:hover {
    transform: translateY(-1px);
}

.arc-result-card {
    border-radius: 8px;
    padding: 15px;
    color: #fff;
    background:
        radial-gradient(circle at 85% 18%, rgba(255, 255, 255, .24), transparent 26%),
        linear-gradient(135deg, #0f6fae, #0b8f82);
}

.arc-result-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 10px;
}

.arc-result-top span {
    font-size: 13px;
    font-weight: 800;
    opacity: .94;
}

.arc-result-card strong {
    display: block;
    font-size: clamp(24px, 4vw, 38px);
    line-height: 1.2;
    word-break: break-word;
    letter-spacing: 0;
}

.arc-result-card small {
    display: block;
    margin-top: 6px;
    opacity: .88;
}

.arc-canvas-wrap {
    background: #f8fbfd;
    border: 1px solid #dce6ee;
    border-radius: 8px;
    padding: 10px;
}

.arc-canvas-wrap canvas {
    display: block;
    width: 100%;
    height: auto;
    aspect-ratio: 12 / 7;
}

.arc-result-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 9px;
}

.arc-result-grid div {
    border: 1px solid #e3eaf1;
    background: #fbfdff;
    border-radius: 8px;
    padding: 10px;
    min-width: 0;
}

.arc-result-grid span {
    display: block;
    color: var(--arc-muted);
    font-size: 12px;
    margin-bottom: 4px;
}

.arc-result-grid b {
    display: block;
    color: #152033;
    font-size: 14px;
    line-height: 1.35;
    word-break: break-word;
}

.arc-formula {
    border-left: 4px solid var(--arc-accent);
    background: #f3faf8;
    border-radius: 8px;
    padding: 12px;
    display: grid;
    gap: 5px;
}

.arc-formula b {
    color: #0b5f59;
}

.arc-formula span {
    color: #315066;
    line-height: 1.55;
    font-size: 13px;
}

.arc-output-actions {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.arc-history-list {
    display: grid;
    gap: 10px;
}

.arc-history-empty {
    border: 1px dashed #bfd0df;
    background: #f8fbfd;
    border-radius: 8px;
    padding: 18px;
    color: var(--arc-muted);
    text-align: center;
}

.arc-history-item {
    border: 1px solid #e1e9f0;
    border-radius: 8px;
    padding: 12px;
    display: grid;
    gap: 8px;
    background: #fbfdff;
}

.arc-history-item strong {
    color: var(--arc-primary-dark);
}

.arc-history-meta {
    color: var(--arc-muted);
    font-size: 12px;
}

.arc-batch-results {
    display: grid;
    gap: 10px;
    padding: 14px;
}

.arc-batch-results-head {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    align-items: center;
}

.arc-batch-results-head span {
    color: var(--arc-muted);
    font-size: 13px;
}

.arc-table-wrap {
    overflow: auto;
    border: 1px solid #e1e9f0;
    border-radius: 8px;
}

.arc-table-wrap table {
    width: 100%;
    border-collapse: collapse;
    min-width: 720px;
    background: #fff;
}

.arc-table-wrap th,
.arc-table-wrap td {
    border-bottom: 1px solid #edf2f6;
    padding: 9px 10px;
    text-align: left;
    font-size: 13px;
    white-space: nowrap;
}

.arc-table-wrap th {
    background: #f1f7fb;
    color: #24405a;
}

.arc-table-wrap tr:last-child td {
    border-bottom: 0;
}

.arc-file-row span {
    color: var(--arc-muted);
    font-size: 13px;
}

.arc-progress {
    display: grid;
    gap: 7px;
    color: #24405a;
    font-size: 13px;
}

.arc-progress div {
    height: 9px;
    border-radius: 999px;
    background: #e7eef5;
    overflow: hidden;
}

.arc-progress i {
    display: block;
    width: 0;
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, var(--arc-primary), var(--arc-accent));
}

.arc-toast {
    position: fixed;
    right: 18px;
    bottom: 18px;
    z-index: 9999;
    background: #102a43;
    color: #fff;
    padding: 11px 14px;
    border-radius: 8px;
    box-shadow: 0 14px 30px rgba(16, 42, 67, .24);
    font-weight: 800;
    max-width: min(360px, calc(100vw - 36px));
}

.arc-invalid {
    border-color: var(--arc-danger) !important;
    box-shadow: 0 0 0 4px rgba(192, 57, 43, .10) !important;
}

[hidden] {
    display: none !important;
}

@media (max-width: 1100px) {
    .arc-layout {
        grid-template-columns: 1fr;
    }

    .arc-right {
        position: static;
    }
}

@media (max-width: 760px) {
    .arc-workbench {
        padding: 12px;
    }

    .arc-toolbar,
    .arc-step-head {
        align-items: stretch;
        flex-direction: column;
    }

    .arc-mode-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .arc-methods,
    .arc-form-grid,
    .arc-batch-config,
    .arc-result-grid,
    .arc-output-actions {
        grid-template-columns: 1fr;
    }

    .arc-mode {
        justify-content: flex-start;
        padding-inline: 12px;
    }
}