.frequency-tool {
    --frequency-panel: #ffffff;
    --frequency-panel-soft: #fbfbfc;
    --frequency-text: #152033;
    --frequency-muted: #687385;
    --frequency-line: #d8dbe0;
    --frequency-line-strong: #c9ced6;
    --frequency-blue: #dbe7f5;
    --frequency-green: #eef8ef;
    --frequency-green-border: #cfe2d1;
    --frequency-amber: #fff5e3;
    --frequency-amber-border: #ecd8ab;
    --frequency-red: #f3e4e4;
    --frequency-red-border: #e9d3d3;
    --frequency-purple: #eee8fb;
    --frequency-purple-border: #d7caef;
    --frequency-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
    color: var(--frequency-text);
    font-family: "Inter", var(--font-sans);
}

html[data-theme="dark"] .frequency-tool {
    --frequency-panel: #1c2128;
    --frequency-panel-soft: #181d24;
    --frequency-text: #f2f5fb;
    --frequency-muted: #a8b2c0;
    --frequency-line: #2f3742;
    --frequency-line-strong: #3a4350;
    --frequency-blue: rgba(110, 168, 255, 0.14);
    --frequency-green: rgba(70, 146, 88, 0.18);
    --frequency-green-border: rgba(125, 190, 140, 0.38);
    --frequency-amber: rgba(190, 138, 42, 0.18);
    --frequency-amber-border: rgba(220, 170, 78, 0.38);
    --frequency-red: rgba(150, 65, 72, 0.22);
    --frequency-red-border: rgba(210, 120, 128, 0.36);
    --frequency-purple: rgba(150, 120, 210, 0.16);
    --frequency-purple-border: rgba(180, 155, 225, 0.32);
}

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

.frequency-topbar {
    display: grid;
    gap: 12px;
    margin-bottom: 12px;
}

.frequency-view-toggle {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 6px;
    padding: 5px;
    border: 1px solid var(--frequency-line);
    border-radius: 999px;
    background: #f1f2f4;
}

.frequency-view-button {
    appearance: none;
    min-width: 0;
    min-height: 48px;
    padding: 12px 10px;
    border: 0;
    border-radius: 999px;
    background: transparent;
    color: #6f7786;
    cursor: pointer;
    font-family: "Inter", var(--font-sans);
    font-size: 0.95rem;
    font-weight: 700;
    line-height: 1.1;
    transition: background-color 0.18s ease, color 0.18s ease, box-shadow 0.18s ease;
    white-space: nowrap;
}

.frequency-view-button:hover {
    color: #4d5666;
}

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

.frequency-actions {
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
}

.frequency-layout {
    display: grid;
    gap: 12px;
    align-items: start;
}

.frequency-sidebar,
.frequency-main {
    display: grid;
    gap: 12px;
    align-content: start;
    min-width: 0;
}

.frequency-input-panel,
.frequency-results-panel {
    display: grid;
    grid-template-rows: auto auto;
    gap: 8px;
    min-width: 0;
    border: 1px solid var(--frequency-line);
    border-radius: 18px;
    background: #f8f8f9;
    padding: 12px;
}

.frequency-panel-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.frequency-panel-head h3 {
    margin: 0;
    color: #465162;
    font-family: "Inter", var(--font-sans);
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

html[data-theme="dark"] .frequency-view-toggle {
    border-color: #313843;
    background: #20252d;
}

html[data-theme="dark"] .frequency-view-button {
    color: #9aa5b4;
}

html[data-theme="dark"] .frequency-view-button:hover {
    color: #c6d0dd;
}

html[data-theme="dark"] .frequency-view-button[aria-pressed="true"] {
    background: rgba(110, 168, 255, 0.14);
    color: #f2f5fb;
    box-shadow: inset 0 0 0 1px rgba(110, 168, 255, 0.22);
}

html[data-theme="dark"] .frequency-input-panel,
html[data-theme="dark"] .frequency-results-panel {
    border-color: #2f3742;
    background: #181d24;
}

html[data-theme="dark"] .frequency-panel-head h3 {
    color: #dce5ef;
}

.frequency-helper {
    margin: 0 0 12px;
    color: var(--frequency-muted);
    font-size: 0.95rem;
    line-height: 1.55;
}

.frequency-helper code {
    padding: 2px 7px;
    border: 1px solid var(--frequency-line);
    border-radius: 999px;
    background: var(--frequency-panel);
    color: var(--frequency-text);
    font-family: var(--frequency-mono);
    font-size: 0.88em;
    font-weight: 700;
}

.frequency-textarea,
.frequency-decode-output {
    width: 100%;
    min-height: 210px;
    border: 1px solid var(--frequency-line-strong);
    border-radius: 16px;
    background: var(--frequency-panel);
    color: var(--frequency-text);
    font-family: var(--frequency-mono);
    font-size: 1rem;
    line-height: 1.45;
}

.frequency-textarea {
    resize: vertical;
    padding: 14px;
    outline: none;
}

.tool-template .frequency-tool textarea.frequency-textarea {
    min-height: 210px;
    height: auto;
    max-height: none;
    resize: vertical;
}

.frequency-textarea::placeholder {
    color: #8a909a;
}

html[data-theme="dark"] .frequency-textarea::placeholder {
    color: #7f8896;
}

.frequency-results-body {
    min-height: 210px;
}

.frequency-empty-state,
.frequency-pattern-empty {
    border: 1px dashed var(--frequency-line-strong);
    background: var(--frequency-panel-soft);
    border-radius: 16px;
    padding: 18px;
    color: var(--frequency-muted);
    font-size: 0.95rem;
    line-height: 1.5;
}

.frequency-insight-list {
    display: grid;
    gap: 8px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.frequency-insight-list li {
    border: 1px solid var(--frequency-line);
    background: var(--frequency-panel);
    border-radius: 14px;
    padding: 10px 11px;
    color: var(--frequency-muted);
    font-size: 0.9rem;
    line-height: 1.42;
}

.frequency-insight-list strong {
    color: var(--frequency-text);
}

.frequency-analysis-panel {
    border: 1px solid var(--frequency-line);
    background: var(--frequency-panel);
    border-radius: 16px;
    padding: 12px;
    overflow: hidden;
}

.frequency-analysis-panel + .frequency-analysis-panel {
    margin-top: 10px;
}

.frequency-analysis-heading {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 10px;
}

.frequency-analysis-heading h4 {
    margin: 0;
    color: #394456;
    font-size: 0.95rem;
    letter-spacing: -0.01em;
}

html[data-theme="dark"] .frequency-analysis-heading h4 {
    color: #dce5ef;
}

.frequency-analysis-heading span {
    color: var(--frequency-muted);
    font-size: 0.82rem;
    font-weight: 700;
}

.frequency-result-scroll,
.frequency-pattern-scroll {
    max-height: 460px;
    overflow: auto;
    border: 1px solid var(--frequency-line);
    border-radius: 13px;
    background: var(--frequency-panel);
}

.frequency-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
}

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

.frequency-table th {
    position: sticky;
    top: 0;
    z-index: 1;
    background: #f5f6f8;
    color: #596477;
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

html[data-theme="dark"] .frequency-table th {
    background: #20252d;
    color: #aeb8c5;
}

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

.frequency-letter-cell,
.frequency-number-cell {
    color: var(--frequency-text);
    font-variant-numeric: tabular-nums;
    font-weight: 700;
}

.frequency-letter-cell {
    font-size: 1rem;
    font-weight: 800;
}

.frequency-muted-cell,
.frequency-candidate-preview {
    color: var(--frequency-muted);
    font-variant-numeric: tabular-nums;
}

.frequency-candidate-preview {
    max-width: 34rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.frequency-bar-track {
    width: 100%;
    min-width: 92px;
    height: 9px;
    overflow: hidden;
    border: 1px solid #e2e5ea;
    border-radius: 999px;
    background: #eef0f3;
}

html[data-theme="dark"] .frequency-bar-track {
    border-color: #323a45;
    background: #151a21;
}

.frequency-bar-fill {
    height: 100%;
    min-width: 2px;
    border-radius: 999px;
    background: #b9cce7;
}

html[data-theme="dark"] .frequency-bar-fill {
    background: #6ea8ff;
}

.frequency-pattern-view {
    display: grid;
    gap: 12px;
}

.frequency-pattern-hero,
.frequency-pattern-card {
    border: 1px solid var(--frequency-line);
    background: var(--frequency-panel);
    border-radius: 18px;
    padding: 14px;
}

.frequency-pattern-kicker {
    display: inline-flex;
    width: fit-content;
    align-items: center;
    padding: 6px 9px;
    border: 1px solid #b8c6da;
    border-radius: 999px;
    background: var(--frequency-blue);
    color: #30435f;
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.015em;
    text-transform: uppercase;
}

html[data-theme="dark"] .frequency-pattern-kicker {
    border-color: #334356;
    color: #dbe7f7;
}

.frequency-pattern-title-text,
.frequency-pattern-note,
.frequency-pattern-card-subtitle,
.frequency-decode-note {
    color: var(--frequency-muted);
    font-size: 0.92rem;
    line-height: 1.45;
}

.frequency-pattern-title-text {
    margin: 10px 0 0;
}

.frequency-pattern-metrics {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    margin-top: 12px;
}

.frequency-pattern-metric {
    border: 1px solid var(--frequency-line);
    border-radius: 14px;
    padding: 10px;
    background: var(--frequency-panel-soft);
}

.frequency-pattern-metric span {
    display: block;
    color: var(--frequency-muted);
    font-size: 0.78rem;
    font-weight: 800;
    text-transform: uppercase;
}

.frequency-pattern-metric strong {
    display: block;
    margin-top: 3px;
    color: var(--frequency-text);
    font-size: 1.15rem;
}

.frequency-pattern-board {
    display: grid;
    gap: 10px;
}

.frequency-pattern-card-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 10px;
}

.frequency-pattern-card-title {
    margin: 0;
    color: var(--frequency-text);
    font-size: 0.98rem;
}

.frequency-pattern-card-subtitle,
.frequency-pattern-note {
    margin: 4px 0 0;
}

.frequency-pattern-badge {
    display: inline-grid;
    min-width: 34px;
    height: 34px;
    place-items: center;
    border: 1px solid var(--frequency-line);
    border-radius: 999px;
    background: var(--frequency-panel-soft);
    color: var(--frequency-text);
    font-weight: 800;
}

.frequency-pattern-token,
.frequency-pattern-word {
    display: inline-block;
    padding: 3px 8px;
    border: 1px solid var(--frequency-purple-border);
    border-radius: 999px;
    background: var(--frequency-purple);
    color: #443861;
    font-family: var(--frequency-mono);
    font-size: 0.82rem;
    font-weight: 800;
}

html[data-theme="dark"] .frequency-pattern-token,
html[data-theme="dark"] .frequency-pattern-word {
    color: #e5ddff;
}

.frequency-decode-summary {
    display: grid;
    gap: 8px;
    margin-bottom: 10px;
}

.frequency-confidence-pill {
    display: inline-flex;
    width: fit-content;
    align-items: center;
    gap: 6px;
    border: 1px solid var(--frequency-line);
    border-radius: 999px;
    padding: 7px 10px;
    background: var(--frequency-panel);
    color: var(--frequency-muted);
    font-size: 0.86rem;
    font-weight: 700;
}

.frequency-confidence-pill.high {
    border-color: var(--frequency-green-border);
    background: var(--frequency-green);
    color: #285f31;
}

.frequency-confidence-pill.medium {
    border-color: var(--frequency-amber-border);
    background: var(--frequency-amber);
    color: #76591e;
}

.frequency-confidence-pill.low {
    border-color: var(--frequency-red-border);
    background: var(--frequency-red);
    color: #694747;
}

html[data-theme="dark"] .frequency-confidence-pill.high,
html[data-theme="dark"] .frequency-confidence-pill.medium,
html[data-theme="dark"] .frequency-confidence-pill.low {
    color: #f2f5fb;
}

.frequency-decode-output {
    min-height: 180px;
    margin: 0;
    padding: 14px;
    overflow: auto;
    white-space: pre-wrap;
    word-break: break-word;
}

.frequency-mapping-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(70px, 1fr));
    gap: 7px;
    margin-top: 10px;
}

.frequency-mapping-chip {
    border: 1px solid var(--frequency-line);
    border-radius: 12px;
    padding: 8px;
    background: var(--frequency-panel);
    color: var(--frequency-muted);
    text-align: center;
    font-size: 0.82rem;
    font-weight: 700;
}

.frequency-mapping-chip strong {
    display: block;
    margin-top: 2px;
    color: var(--frequency-text);
    font-size: 1rem;
}

.frequency-tool .cipher-mini-btn.is-done {
    border-color: var(--frequency-green-border);
    background: var(--frequency-green);
    color: #245e2d;
}

.frequency-tool .cipher-mini-btn.is-error {
    border-color: var(--frequency-amber-border);
    background: var(--frequency-amber);
    color: #7b5c1c;
}

html[data-theme="dark"] .frequency-tool .cipher-mini-btn.is-done,
html[data-theme="dark"] .frequency-tool .cipher-mini-btn.is-error {
    color: #f2f5fb;
}

@media (max-width: 1023px) {
    .frequency-tool-template .tool-template-card {
        display: flex;
        flex-direction: column;
        gap: 14px;
    }

    .frequency-topbar {
        display: contents;
    }

    .frequency-topbar .tool-topbar-start,
    .frequency-topbar .tool-topbar-end {
        width: 100%;
        max-width: none;
    }

    .frequency-topbar .tool-topbar-start {
        order: 1;
        margin-bottom: 8px;
    }

    .frequency-topbar .tool-topbar-end {
        order: 2;
        margin-bottom: 14px;
    }

    .frequency-layout {
        display: contents;
    }

    .frequency-main {
        order: 3;
        display: grid;
        gap: 12px;
    }

    .frequency-sidebar {
        order: 4;
        display: grid;
        gap: 12px;
    }

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

    .frequency-actions .cipher-btn {
        min-height: 52px;
        padding: 10px 8px;
        font-size: 0.83rem;
        line-height: 1.15;
    }
}

@media (min-width: 700px) {
    .frequency-actions {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .frequency-pattern-metrics {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }

    .frequency-pattern-board {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .frequency-pattern-card-wide {
        grid-column: 1 / -1;
    }
}

@media (min-width: 1024px) {
    .frequency-topbar,
    .frequency-layout {
        --frequency-left-col: minmax(300px, 0.88fr);
        --frequency-right-col: minmax(0, 1.38fr);
        grid-template-columns: var(--frequency-left-col) var(--frequency-right-col);
        gap: 12px;
    }

    .frequency-topbar {
        align-items: stretch;
        margin-bottom: 12px;
    }

    .frequency-layout {
        align-items: stretch;
    }

    .frequency-view-toggle {
        width: 100%;
        min-height: 50px;
        height: 50px;
        padding: 4px;
        align-self: stretch;
    }

    .frequency-view-button {
        min-height: 40px;
        height: 100%;
        padding: 8px;
        font-size: 0.88rem;
        white-space: normal;
    }

    .frequency-actions {
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 8px;
        min-width: 0;
        align-items: stretch;
    }

    .frequency-sidebar {
        position: sticky;
        top: 16px;
        gap: 10px;
    }

    .frequency-main {
        grid-template-rows: auto minmax(0, 1fr);
        align-self: stretch;
        gap: 10px;
        min-height: 100%;
        height: 100%;
    }

    .frequency-input-panel,
    .frequency-results-panel {
        padding: 10px;
        border-radius: 16px;
        min-height: 0;
    }

    .frequency-results-panel {
        grid-template-rows: auto minmax(0, 1fr);
    }

    .frequency-results-body {
        min-height: 0;
        overflow: auto;
        padding-right: 2px;
    }

    .tool-template .frequency-tool textarea.frequency-textarea {
        min-height: 210px;
        padding: 12px;
        border-radius: 14px;
        font-size: 0.96rem;
        line-height: 1.42;
    }
}

@media (max-width: 560px) {
    .frequency-view-toggle {
        gap: 4px;
        padding: 4px;
    }

    .frequency-view-button {
        padding-inline: 8px;
        font-size: 0.88rem;
        white-space: normal;
    }

    .frequency-table {
        font-size: 0.82rem;
    }

    .frequency-table th,
    .frequency-table td {
        padding: 8px;
    }
}