.checksum-tool {
    max-width: 920px;
    margin: 0 auto;
}

.checksum-title-icon {
    display: inline-grid;
    place-items: center;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 0.7rem;
    background: linear-gradient(135deg, #2563eb, #4f46e5);
    color: #fff;
    font-size: 1.35rem;
    font-weight: 800;
}

.checksum-summary {
    max-width: 68ch;
    line-height: 1.55;
}

.checksum-purpose {
    margin-bottom: 1rem;
    padding: 1rem 1.1rem;
    border-left: 4px solid #2563eb;
    border-radius: 0.25rem 0.75rem 0.75rem 0.25rem;
    background: rgba(37, 99, 235, 0.07);
    line-height: 1.55;
}

.checksum-purpose p {
    margin: 0.3rem 0 0;
}

.checksum-form {
    display: grid;
    gap: 1rem;
}

.checksum-panel,
.checksum-results {
    padding: 1.25rem;
    border: 1px solid var(--border-color, #dbe2ea);
    border-radius: 0.9rem;
    background: var(--panel-background, #fff);
    box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}

.checksum-drop-zone {
    display: grid;
    justify-items: center;
    gap: 0.45rem;
    min-height: 190px;
    padding: 1.5rem;
    border: 2px dashed #94a3b8;
    border-radius: 0.8rem;
    text-align: center;
    cursor: pointer;
    transition: border-color 160ms ease, background-color 160ms ease, transform 160ms ease;
}

.checksum-drop-zone:hover,
.checksum-drop-zone:focus-within,
.checksum-drop-zone.is-dragging {
    border-color: #2563eb;
    background: rgba(37, 99, 235, 0.06);
}

.checksum-drop-zone.is-dragging {
    transform: scale(1.01);
}

.checksum-file-input {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    clip-path: inset(50%);
    white-space: nowrap;
}

.checksum-drop-icon {
    display: grid;
    place-items: center;
    width: 3rem;
    height: 3rem;
    border-radius: 999px;
    background: rgba(37, 99, 235, 0.12);
    color: #1d4ed8;
    font-size: 1.6rem;
    line-height: 1;
}

.checksum-drop-zone strong {
    font-size: 1.05rem;
}

.checksum-drop-zone span:not(.checksum-drop-icon),
.checksum-drop-zone small {
    max-width: 100%;
    color: var(--muted-color, #64748b);
    overflow-wrap: anywhere;
}

.checksum-fieldset {
    min-width: 0;
    margin: 0;
}

.checksum-fieldset legend {
    padding: 0 0.35rem;
    font-weight: 700;
}

.checksum-algorithms {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.75rem;
}

.checksum-algorithm {
    display: flex;
    align-items: flex-start;
    gap: 0.7rem;
    padding: 0.9rem;
    border: 1px solid var(--border-color, #dbe2ea);
    border-radius: 0.7rem;
    cursor: pointer;
}

.checksum-algorithm:hover,
.checksum-algorithm:focus-within {
    border-color: #2563eb;
}

.checksum-algorithm input {
    width: 1.15rem;
    height: 1.15rem;
    margin-top: 0.1rem;
    accent-color: #2563eb;
}

.checksum-algorithm span {
    display: grid;
    gap: 0.15rem;
}

.checksum-algorithm small {
    color: var(--muted-color, #64748b);
}

.checksum-section-heading h2,
.checksum-results-heading h2 {
    margin: 0;
    font-size: 1.15rem;
}

.checksum-section-heading h2 span {
    margin-left: 0.35rem;
    color: var(--muted-color, #64748b);
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
}

.checksum-section-heading p,
.checksum-results-heading p {
    margin: 0.3rem 0 0;
    color: var(--muted-color, #64748b);
}

.checksum-verify-grid {
    display: grid;
    grid-template-columns: minmax(0, 2fr) minmax(150px, 1fr);
    gap: 0.85rem;
    margin-top: 1rem;
}

.checksum-verify-grid label {
    display: grid;
    gap: 0.4rem;
    font-weight: 600;
}

.checksum-verify-grid input,
.checksum-verify-grid select {
    width: 100%;
    min-height: 44px;
    padding: 0.65rem 0.75rem;
    border: 1px solid var(--border-color, #cbd5e1);
    border-radius: 0.55rem;
    background: var(--input-background, #fff);
    color: inherit;
    font: inherit;
}

.checksum-verify-grid input:focus,
.checksum-verify-grid select:focus {
    border-color: #2563eb;
    outline: 3px solid rgba(37, 99, 235, 0.15);
}

.checksum-privacy-notice {
    line-height: 1.55;
}

.checksum-actions {
    display: flex;
    justify-content: flex-start;
}

.checksum-actions .button {
    min-height: 44px;
}

.checksum-progress {
    align-items: center;
    gap: 0.7rem;
}

.checksum-progress:not([hidden]) {
    display: flex;
}

.checksum-error {
    border-color: #ef4444;
    color: #991b1b;
    background: #fef2f2;
}

.checksum-results {
    margin-top: 1.25rem;
}

.checksum-results-heading {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1rem;
}

.checksum-match {
    margin-bottom: 1rem;
    padding: 0.85rem 1rem;
    border: 1px solid;
    border-radius: 0.65rem;
    font-weight: 700;
}

.checksum-match.is-match {
    border-color: #22c55e;
    color: #166534;
    background: #f0fdf4;
}

.checksum-match.is-mismatch {
    border-color: #ef4444;
    color: #991b1b;
    background: #fef2f2;
}

.checksum-result-list {
    display: grid;
    gap: 0.75rem;
}

.checksum-result-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.9rem;
    border: 1px solid var(--border-color, #dbe2ea);
    border-radius: 0.65rem;
    background: var(--subtle-background, #f8fafc);
}

.checksum-result-content {
    display: grid;
    min-width: 0;
    gap: 0.3rem;
}

.checksum-result-content code {
    color: inherit;
    font-size: 0.86rem;
    line-height: 1.5;
    overflow-wrap: anywhere;
    word-break: break-all;
}

.checksum-copy-button {
    flex: 0 0 auto;
}

.checksum-guide {
    margin-top: 1.25rem;
    line-height: 1.65;
}

.checksum-guide > h2 {
    margin: 0;
    font-size: 1.25rem;
}

.checksum-guide > p {
    max-width: 78ch;
}

.checksum-guide-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.25rem;
    margin-top: 1.15rem;
}

.checksum-guide-grid > div {
    padding: 1rem;
    border-radius: 0.7rem;
    background: var(--subtle-background, #f8fafc);
}

.checksum-guide-grid h3 {
    margin: 0 0 0.55rem;
    font-size: 1rem;
}

.checksum-guide-grid ul,
.checksum-guide-grid ol {
    margin: 0;
    padding-left: 1.35rem;
}

.checksum-guide-grid li + li {
    margin-top: 0.35rem;
}

.checksum-guide-note {
    margin: 1.15rem 0 0;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color, #dbe2ea);
}

.checksum-admin-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
    margin: 1.25rem 0;
}

.checksum-admin-grid article {
    padding: 1rem;
    border: 1px solid var(--border-color, #dbe2ea);
    border-radius: 0.75rem;
    background: var(--panel-background, #fff);
}

.checksum-admin-grid h3 {
    margin: 0 0 0.6rem;
    font-size: 1rem;
}

.checksum-admin-grid p {
    margin: 0.6rem 0 0;
    color: var(--muted-color, #64748b);
    line-height: 1.5;
}

@media (max-width: 720px) {
    .checksum-algorithms,
    .checksum-verify-grid,
    .checksum-guide-grid,
    .checksum-admin-grid {
        grid-template-columns: 1fr;
    }

    .checksum-results-heading,
    .checksum-result-row {
        align-items: stretch;
        flex-direction: column;
    }

    .checksum-results-heading .button,
    .checksum-result-row .button,
    .checksum-actions .button {
        width: 100%;
    }
}

@media (prefers-reduced-motion: reduce) {
    .checksum-drop-zone {
        transition: none;
    }
}