/* app.css
   ---------------------------------------------------------------------------
   All of ColumnSift's styling, in one file. Plain CSS with named variables for
   the colours, adapting to a light or dark system theme. No framework, nothing
   generated.
   --------------------------------------------------------------------------- */

:root {
    --background: #f7f8fa;
    --surface: #ffffff;
    --surface-sunken: #f1f3f6;
    --ink: #1b2230;
    --ink-soft: #5a6473;
    --ink-faint: #8a94a6;
    --line: #e4e8ee;

    --accent: #2f855a;
    --accent-ink: #ffffff;

    --good: #12855a;
    --good-background: #e7f6ef;
    --warn: #9a6400;
    --warn-background: #fbf1df;
    --danger: #d64545;

    --radius: 11px;
    --radius-small: 7px;
    --shadow: 0 1px 2px rgba(18, 26, 44, 0.06), 0 8px 22px rgba(18, 26, 44, 0.07);
    --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --mono: ui-monospace, "SF Mono", "Cascadia Code", Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
    :root {
        --background: #0f1319;
        --surface: #161b23;
        --surface-sunken: #1c222c;
        --ink: #e6eaf0;
        --ink-soft: #9aa4b4;
        --ink-faint: #6b7688;
        --line: #273040;

        --accent: #4ac085;
        --accent-ink: #0b0d13;

        --good: #43c98a;
        --good-background: #12291f;
        --warn: #e0a94a;
        --warn-background: #2a2114;
        --danger: #f0666b;

        --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 10px 28px rgba(0, 0, 0, 0.35);
    }
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: var(--sans);
    color: var(--ink);
    background: var(--background);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

h2 { font-size: 18px; margin: 0; letter-spacing: -0.01em; }
h3 { font-size: 14px; margin: 0 0 12px; letter-spacing: 0.01em; }
.starting { padding: 40px; color: var(--ink-faint); }

/* --- Top bar (return link, About, attribution) --------------------------- */
.return-bar {
    display: flex; align-items: center; justify-content: space-between; gap: 12px;
    padding: 7px 24px; background: var(--surface-sunken); border-bottom: 1px solid var(--line);
}
.return-bar-right { display: flex; align-items: center; gap: 16px; }
.return-link { font-size: 13px; font-weight: 600; color: var(--accent); text-decoration: none; }
.return-link:hover { text-decoration: underline; }
.link-button {
    border: none; background: transparent; padding: 0; cursor: pointer;
    font: inherit; font-size: 13px; font-weight: 600; color: var(--accent); text-decoration: none;
}
.link-button:hover { text-decoration: underline; }
.byline { font-size: 12.5px; color: var(--ink-faint); }

/* --- About pop-over ------------------------------------------------------- */
.about-panel { width: min(560px, 100%); }
.about-body p { margin: 0 0 12px; }
.about-body h3 { margin: 16px 0 8px; }
.about-privacy { color: var(--accent); font-weight: 600; }
.about-steps { margin: 0 0 12px; padding-left: 20px; display: flex; flex-direction: column; gap: 8px; }
.about-steps li { font-size: 14px; }
.about-note { font-size: 13px; color: var(--ink-soft); background: var(--surface-sunken); border: 1px solid var(--line); border-radius: var(--radius-small); padding: 10px 12px; }

/* --- Header --------------------------------------------------------------- */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 14px 24px;
    background: var(--surface);
    border-bottom: 1px solid var(--line);
    flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 13px; }
.brand-mark {
    display: grid; place-items: center;
    width: 38px; height: 38px;
    border-radius: 10px;
    background: var(--accent); color: var(--accent-ink);
    font-size: 20px; font-weight: 700;
}
.brand-name { font-weight: 650; font-size: 16px; }
.brand-sub { font-size: 13px; color: var(--ink-soft); }

.header-controls { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.view-toggle {
    display: inline-flex;
    background: var(--surface-sunken);
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 3px;
}
.toggle {
    border: none; background: transparent; color: var(--ink-soft);
    font: inherit; font-weight: 600; font-size: 13px;
    padding: 6px 16px; border-radius: 999px; cursor: pointer;
}
.toggle.active { background: var(--surface); color: var(--ink); box-shadow: var(--shadow); }

/* --- Buttons -------------------------------------------------------------- */
.button {
    font: inherit; font-weight: 600; font-size: 14px; cursor: pointer;
    border: 1px solid var(--line); border-radius: var(--radius-small);
    padding: 9px 15px; background: var(--surface); color: var(--ink);
    transition: border-color 0.12s ease, background 0.12s ease, transform 0.04s ease;
}
.button:hover { border-color: color-mix(in srgb, var(--accent) 45%, var(--line)); }
.button:active { transform: translateY(1px); }
.button:disabled { opacity: 0.45; cursor: not-allowed; }
.button.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.button.ghost { background: transparent; }
.button.small { font-size: 13px; padding: 6px 11px; }
.button.danger-text { color: var(--danger); }
.button.danger-text:hover { border-color: color-mix(in srgb, var(--danger) 45%, var(--line)); }

.icon-button {
    font: inherit; font-size: 15px; line-height: 1; cursor: pointer;
    border: 1px solid var(--line); background: var(--surface); color: var(--ink-soft);
    border-radius: var(--radius-small); width: 28px; height: 28px;
    display: grid; place-items: center;
}
.icon-button:hover { color: var(--ink); border-color: color-mix(in srgb, var(--accent) 40%, var(--line)); }
.icon-button:disabled { opacity: 0.35; cursor: not-allowed; }
.icon-button.danger:hover { color: var(--danger); border-color: color-mix(in srgb, var(--danger) 40%, var(--line)); }

/* --- Form controls -------------------------------------------------------- */
select, input[type="text"], input[type="number"], input[type="file"], textarea {
    font: inherit; color: var(--ink); background: var(--surface);
    border: 1px solid var(--line); border-radius: var(--radius-small); padding: 8px 11px;
}
select:focus, input:focus, textarea:focus {
    outline: 2px solid color-mix(in srgb, var(--accent) 40%, transparent);
    outline-offset: 1px; border-color: var(--accent);
}

/* --- Load screen ---------------------------------------------------------- */
.app-body { padding: 24px; }
.picker-card {
    max-width: 520px; margin: 5vh auto 0;
    background: var(--surface); border: 1px solid var(--line);
    border-radius: var(--radius); box-shadow: var(--shadow); padding: 28px;
}
.picker-card h2 { margin-bottom: 4px; }
.field { display: block; margin: 18px 0; }
.field > span { display: block; font-size: 13px; font-weight: 600; color: var(--ink-soft); margin-bottom: 6px; }
.file-row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.file-row input[type="file"] { flex: 1; min-width: 200px; }
.sheet-chooser-area:not(:empty) { margin-top: 10px; }
.sheet-chooser-area select { flex: 1; min-width: 200px; }
.paste-area { width: 100%; font-family: var(--mono); font-size: 13px; margin-bottom: 8px; resize: vertical; }
.resume { margin: 16px 0; }
.resume .button { width: 100%; }
.saved-rules-note {
    display: flex; align-items: center; justify-content: space-between; gap: 12px;
    background: var(--surface-sunken); border: 1px solid var(--line);
    border-radius: var(--radius-small); padding: 10px 12px; font-size: 13px; margin: 16px 0;
}

/* --- Workspace layout ----------------------------------------------------- */
.workspace { display: grid; grid-template-columns: 232px 1fr; gap: 20px; align-items: start; }
@media (max-width: 760px) { .workspace { grid-template-columns: 1fr; } }

.sidebar {
    background: var(--surface); border: 1px solid var(--line);
    border-radius: var(--radius); box-shadow: var(--shadow); padding: 12px;
    position: sticky; top: 16px; max-height: calc(100vh - 110px); overflow: auto;
}
.sidebar-title {
    font-size: 11px; text-transform: uppercase; letter-spacing: 0.06em;
    color: var(--ink-faint); font-weight: 700; padding: 6px 8px 10px;
}
.column-list { display: flex; flex-direction: column; gap: 2px; }
.column-button {
    text-align: left; border: none; background: transparent; color: var(--ink-soft);
    font: inherit; font-size: 13.5px; padding: 8px 10px; border-radius: var(--radius-small);
    cursor: pointer; word-break: break-word;
}
.column-button:hover { background: var(--surface-sunken); color: var(--ink); }
.column-button.active { background: color-mix(in srgb, var(--accent) 14%, transparent); color: var(--ink); font-weight: 600; }

.main-area { min-width: 0; }

/* --- Column header + counts ---------------------------------------------- */
.column-header { display: flex; align-items: center; justify-content: space-between; gap: 14px; margin-bottom: 16px; flex-wrap: wrap; }
.column-title { font-size: 20px; }
.counts { display: flex; gap: 8px; }
.count-chip { font-size: 13px; padding: 4px 12px; border-radius: 999px; border: 1px solid var(--line); background: var(--surface); color: var(--ink-soft); }
.count-chip b { color: var(--ink); }
.count-chip.good { background: var(--good-background); border-color: color-mix(in srgb, var(--good) 30%, var(--line)); }
.count-chip.good b { color: var(--good); }
.count-chip.warn { background: var(--warn-background); border-color: color-mix(in srgb, var(--warn) 30%, var(--line)); }
.count-chip.warn b { color: var(--warn); }

/* --- Cards ---------------------------------------------------------------- */
.panel-card {
    background: var(--surface); border: 1px solid var(--line);
    border-radius: var(--radius); box-shadow: var(--shadow); padding: 18px; margin-bottom: 18px;
}
.two-lists { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-bottom: 18px; }
.two-lists .panel-card { margin-bottom: 0; }
@media (max-width: 720px) { .two-lists { grid-template-columns: 1fr; } }

.card-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 12px; }
.card-head h3 { margin: 0; }
.sort-control { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; color: var(--ink-soft); }
.sort-select { padding: 4px 8px; font-size: 12.5px; }

/* --- Lists (resolved / unresolved) --------------------------------------- */
.list { display: flex; flex-direction: column; gap: 2px; max-height: 430px; overflow: auto; }
.list-item { padding: 9px 10px; border-radius: var(--radius-small); }
.list-item:hover { background: var(--surface-sunken); }
.list-item.unresolved { background: var(--surface-sunken); margin-bottom: 6px; }

.value-line { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.value { font-family: var(--mono); font-size: 13px; word-break: break-word; }
.value.result { font-weight: 650; }
.arrow { color: var(--ink-faint); }
.meta { display: flex; align-items: center; gap: 10px; margin-top: 3px; }
.how { font-size: 12px; color: var(--ink-soft); }
.times { font-size: 11.5px; color: var(--ink-faint); margin-left: auto; }
.reason { font-size: 12.5px; color: var(--warn); margin: 4px 0 8px; }

.inline-controls { display: flex; gap: 7px; align-items: center; flex-wrap: wrap; }
.inline-input { flex: 1; min-width: 120px; }

.muted { color: var(--ink-soft); }
.muted.small, .small { font-size: 12.5px; }
.error-text { color: var(--danger); }

/* --- Rules ---------------------------------------------------------------- */
.rules-list { display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; }
.rule-row { display: flex; align-items: center; gap: 10px; padding: 9px 11px; background: var(--surface-sunken); border: 1px solid var(--line); border-radius: var(--radius-small); }
.rule-number { color: var(--ink-faint); font-size: 13px; font-variant-numeric: tabular-nums; }
.rule-text { flex: 1; font-size: 13.5px; word-break: break-word; }
.rule-buttons { display: flex; gap: 5px; }

.add-rule { display: grid; grid-template-columns: 1fr; gap: 12px 16px; align-items: start; border-top: 1px dashed var(--line); padding-top: 16px; }
.add-rule-half { display: flex; flex-direction: column; gap: 6px; }
.add-rule-label { font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; color: var(--ink-faint); }
.add-rule-tail { grid-column: 1 / -1; display: flex; gap: 10px; align-items: center; }
.note-input { flex: 1; }

/* --- The test / action chooser ------------------------------------------- */
.chooser { display: flex; flex-direction: column; gap: 8px; }
.chooser-type { width: 100%; }
.chooser-fields { display: flex; flex-direction: column; gap: 8px; }
.chooser-field { display: flex; flex-direction: column; gap: 4px; }
.chooser-field-label { font-size: 12px; color: var(--ink-soft); }
.chooser-input { width: 100%; }

/* --- Checks --------------------------------------------------------------- */
.checks-list { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.check-row { display: flex; align-items: center; gap: 10px; padding: 8px 11px; background: var(--surface-sunken); border: 1px solid var(--line); border-radius: var(--radius-small); }
.check-text { flex: 1; font-size: 13.5px; }
.add-check { display: flex; gap: 10px; align-items: start; border-top: 1px dashed var(--line); padding-top: 14px; }
.add-check .chooser { flex: 1; }

/* --- Chips / tags --------------------------------------------------------- */
.chip { font-size: 11px; font-weight: 600; padding: 1px 8px; border-radius: 999px; background: var(--good-background); color: var(--good); border: 1px solid color-mix(in srgb, var(--good) 30%, var(--line)); }

/* --- Table (grid) view ---------------------------------------------------- */
.paging-bar { display: flex; align-items: center; gap: 14px; margin-bottom: 12px; }
.paging-text { font-size: 13px; color: var(--ink-soft); }
.paging-spacer { flex: 1; }
.table-scroll { overflow: auto; max-height: calc(100vh - 180px); background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.grid { border-collapse: collapse; font-size: 13px; width: max-content; min-width: 100%; }
.grid th, .grid td { border-bottom: 1px solid var(--line); border-right: 1px solid var(--line); padding: 7px 11px; text-align: left; white-space: nowrap; }
.grid thead th { position: sticky; top: 0; background: var(--surface-sunken); color: var(--ink-soft); font-weight: 600; z-index: 1; }
.grid td { font-family: var(--mono); max-width: 260px; overflow: hidden; text-overflow: ellipsis; }
.row-number, .row-number-heading { position: sticky; left: 0; background: var(--surface-sunken); color: var(--ink-faint); font-family: var(--sans); cursor: pointer; text-align: right; }
.row-number:hover { color: var(--accent); }
.cell-unresolved { background: var(--warn-background); color: var(--warn); }
.grid tr.removed td { opacity: 0.5; text-decoration: line-through; }
.grid tr.removed .row-number { text-decoration: none; }

/* --- Row panel (pop-over) ------------------------------------------------- */
.overlay { position: fixed; inset: 0; background: rgba(10, 14, 22, 0.5); display: grid; place-items: start center; padding: 5vh 16px; z-index: 50; overflow: auto; }
.panel { width: min(680px, 100%); background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.panel-header { display: flex; align-items: center; justify-content: space-between; padding: 16px 20px; border-bottom: 1px solid var(--line); position: sticky; top: 0; background: var(--surface); border-radius: var(--radius) var(--radius) 0 0; }
.panel-title-block { display: flex; align-items: baseline; gap: 10px; }
.panel-position { font-size: 12.5px; color: var(--ink-faint); }
.panel-nav { display: flex; align-items: center; gap: 8px; }
.panel-body { padding: 16px 20px 20px; }
.row-action { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 12px; }
.removed-note { background: var(--warn-background); border: 1px solid color-mix(in srgb, var(--warn) 30%, var(--line)); color: var(--warn); border-radius: var(--radius-small); padding: 8px 12px; font-size: 13px; }
.fix-row { display: flex; align-items: center; justify-content: space-between; gap: 14px; padding: 10px 0; border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.fix-row:last-child { border-bottom: none; }
.fix-label { display: flex; flex-direction: column; gap: 2px; min-width: 180px; }
.fix-column-name { font-size: 12px; font-weight: 600; color: var(--ink-soft); }
.fix-value { font-family: var(--mono); font-size: 13px; word-break: break-word; }
.fix-row.is-unresolved .fix-column-name { color: var(--warn); }
.fix-controls { display: flex; gap: 7px; align-items: center; }
.fix-input { width: 150px; }