/* =====================================================================
   ENGINEERING TOOLBOX — Technical UI (engineering-software panels).
   Navy (#061A4A) structure + red (#F20D18) accent, monospace data.
   Scoped entirely under `.et`; loaded after app.css. Calculation logic,
   element IDs and JS-bound classes are untouched — this only restyles.
   ===================================================================== */
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans+Thai:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500;600&family=IBM+Plex+Sans:wght@400;500;600&display=swap');

.et {
    --bg: #E9ECF2;             /* cool technical ground */
    --surface: #FFFFFF;
    --panel-2: #F3F5FA;        /* faint navy tint fill */
    --ink: #16233F;            /* dark-navy body text */
    --ink-2: #56617B;          /* secondary */
    --muted: #8B93A6;          /* muted labels */
    --line: #D2DAEA;           /* light navy border */
    --line-2: #A9B6D4;         /* stronger border */
    --navy: #061A4A;           /* primary / title bars */
    --navy-soft: #EAEEF7;      /* navy hover / header tint */
    --navy-on: #9FB0D6;        /* muted text on navy */
    --red: #F20D18;            /* accent */
    --red-2: #C10910;
    --red-on-navy: #FF5A62;    /* red legible on navy */
    --red-wash: #FDEBEB;

    --sans: 'IBM Plex Sans Thai', 'IBM Plex Sans', 'Noto Sans Thai', system-ui, sans-serif;
    --mono: 'IBM Plex Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;

    background: var(--bg);
    color: var(--ink);
    font-family: var(--sans);
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    padding: 36px 24px 88px;
    min-height: 60vh;
}
.et *,
.et *::before,
.et *::after { box-sizing: border-box; }

.et-wrap {
    max-width: 1440px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 236px minmax(0, 1fr);
    gap: 44px;
    align-items: start;
}
.et-main { min-width: 0; }

.et-back {
    display: none;
    font-family: var(--mono);
    font-size: 12px;
    letter-spacing: .04em;
    text-transform: uppercase;
    color: var(--ink-2);
    margin-bottom: 18px;
}
.et-back:hover { color: var(--red); }

/* =====================================================================
   NAVIGATION — module index rail
   ===================================================================== */
.et-nav { position: sticky; top: 24px; }
.et-nav-kicker {
    display: block;
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: .11em;
    text-transform: uppercase;
    color: var(--navy);
    font-weight: 500;
    padding: 0 0 12px;
    margin-bottom: 6px;
    border-bottom: 2px solid var(--navy);
}
.et-nav-list { list-style: none; margin: 0; padding: 0; }
.et-nav-item a {
    display: grid;
    grid-template-columns: 28px 1fr;
    gap: 8px;
    align-items: baseline;
    padding: 10px 12px 10px 11px;
    border-left: 2px solid transparent;
    color: var(--ink-2);
    transition: color .14s ease, border-color .14s ease, background .14s ease;
}
.et-nav-item a:hover { color: var(--navy); background: var(--navy-soft); }
.et-nav-num { font-family: var(--mono); font-size: 12px; color: var(--muted); }
.et-nav-name { font-size: 13.5px; font-weight: 400; line-height: 1.35; }
.et-nav-item.is-on a { color: var(--navy); border-left-color: var(--red); background: var(--navy-soft); }
.et-nav-item.is-on .et-nav-num { color: var(--red); }
.et-nav-item.is-on .et-nav-name { font-weight: 600; }

/* =====================================================================
   TOOL HEADER — navy title bar + large title
   ===================================================================== */
.et-head { margin-bottom: 40px; }
.et-head-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    background: var(--navy);
    border-left: 3px solid var(--red);
    padding: 9px 16px;
    margin-bottom: 20px;
}
.et-eyebrow {
    font-family: var(--mono);
    font-size: 11.5px;
    letter-spacing: .11em;
    text-transform: uppercase;
    color: var(--navy-on);
}
.et-eyebrow b { color: #fff; font-weight: 500; }
.et-id {
    font-family: var(--mono);
    font-size: 12px;
    letter-spacing: .1em;
    color: var(--red-on-navy);
    white-space: nowrap;
}
.et-title {
    font-size: 44px;
    line-height: 1.05;
    font-weight: 600;
    letter-spacing: -0.015em;
    color: var(--navy);
    margin: 0 0 12px;
}
.et-sub {
    font-size: 16px;
    line-height: 1.6;
    font-weight: 400;
    color: var(--ink-2);
    max-width: 70ch;
    margin: 0;
}
.et-sub b { font-weight: 600; color: var(--ink); }
.et-std { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.et-std span {
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: .05em;
    color: var(--navy);
    background: var(--surface);
    border: 1px solid var(--line-2);
    border-radius: 0;
    padding: 4px 9px;
    white-space: nowrap;
}

/* =====================================================================
   SECTION — navy title bar (panel header)
   ===================================================================== */
.et-section { margin-bottom: 34px; }
.et-section:last-child { margin-bottom: 0; }
.et-sec-head {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--navy);
    border-left: 3px solid var(--red);
    padding: 10px 16px;
    margin-bottom: 16px;
}
.et-sec-no { font-family: var(--mono); font-size: 13px; color: var(--red-on-navy); font-weight: 600; }
.et-sec-no::before { content: '['; }
.et-sec-no::after { content: ']'; }
.et-sec-name {
    font-family: var(--mono);
    font-size: 12px;
    letter-spacing: .08em;
    text-transform: uppercase;
    color: #fff;
    font-weight: 500;
}
.et-sec-meta { margin-left: auto; font-family: var(--mono); font-size: 11px; letter-spacing: .04em; color: var(--navy-on); }

/* =====================================================================
   INPUT — framed technical module
   ===================================================================== */
.et .tool-input {
    background: var(--surface);
    border: 1px solid var(--line-2);
    border-radius: 0;
    box-shadow: none;
    padding: 22px;
    margin: 0;
}
.et .tool-input label { font-family: var(--sans); font-weight: 600; font-size: 14px; color: var(--navy); margin: 0; }
.et .tool-fields {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
    gap: 22px;
}
.et .tool-field { display: flex; flex-direction: column; gap: 8px; }
.et .tool-field label { font-family: var(--sans); font-weight: 600; font-size: 13.5px; color: var(--navy); line-height: 1.3; }
.et .tool-field label span {
    display: block;
    font-family: var(--mono);
    font-size: 10.5px;
    font-weight: 400;
    letter-spacing: .05em;
    text-transform: uppercase;
    color: var(--muted);
    margin-top: 3px;
}
.et .tool-field label em { font-style: normal; }
.et .in-wrap { position: relative; display: flex; align-items: center; }
.et .tool-field input[type=number],
.et .tool-field select,
.et .tool-field input[type=text] {
    width: 100%;
    height: 48px;
    background: var(--surface);
    border: 1px solid var(--line-2);
    border-radius: 0;
    padding: 0 14px;
    font-size: 16px;
    color: var(--ink);
    transition: border-color .14s ease, box-shadow .14s ease;
}
.et .tool-field input[type=number] { font-family: var(--mono); font-weight: 500; padding-right: 52px; }
.et .tool-field select {
    font-family: var(--sans);
    appearance: none; -webkit-appearance: none; cursor: pointer;
    padding-right: 40px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='7' viewBox='0 0 10 7'%3E%3Cpath d='M1 1l4 4 4-4' fill='none' stroke='%23061A4A' stroke-width='1.4'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
}
.et .tool-field input:focus,
.et .tool-field select:focus {
    outline: none;
    border-color: var(--red);
    box-shadow: inset 0 0 0 1px var(--red);
}
.et .tool-field .unit {
    position: absolute;
    right: 14px;
    font-family: var(--mono);
    font-size: 12px;
    font-weight: 500;
    letter-spacing: .03em;
    color: var(--muted);
    pointer-events: none;
}

/* segmented control */
.et .tool-seg {
    display: inline-flex;
    background: var(--surface);
    border: 1px solid var(--line-2);
    border-radius: 0;
    padding: 0;
    overflow: hidden;
    margin-bottom: 2px;
}
.et .tool-seg button {
    font-family: var(--sans);
    font-weight: 600;
    font-size: 13.5px;
    color: var(--ink-2);
    background: transparent;
    border: 0;
    border-right: 1px solid var(--line-2);
    padding: 11px 22px;
    cursor: pointer;
    transition: background .14s ease, color .14s ease;
}
.et .tool-seg button:last-child { border-right: 0; }
.et .tool-seg button:hover { color: var(--navy); background: var(--navy-soft); }
.et .tool-seg button.is-on { background: var(--red); color: #fff; }

/* =====================================================================
   CALCULATION RESULT — instrument-readout column table (navy + red)
   ===================================================================== */
.et .tool-results {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(184px, 1fr));
    gap: 12px;
    margin: 0;
}
.et .tool-stat {
    display: flex;
    flex-direction: column;
    gap: 0;
    background: var(--surface);
    border: 1px solid var(--line-2);
    border-top: 4px solid var(--navy);
    border-radius: 0;
    box-shadow: none;
    min-width: 0;
}
.et .tool-stat-label {
    font-family: var(--sans);
    font-weight: 600;
    font-size: 14px;
    color: var(--navy);
    line-height: 1.3;
    background: var(--navy-soft);
    border-bottom: 1px solid var(--line);
    padding: 12px 16px;
}
.et .tool-stat-label span {
    display: block;
    font-family: var(--mono);
    font-size: 10.5px;
    font-weight: 400;
    letter-spacing: .05em;
    text-transform: uppercase;
    color: var(--navy-muted, var(--muted));
    margin-top: 3px;
}
.et .tool-stat-val {
    font-family: var(--mono);
    font-weight: 600;
    font-size: 40px;
    line-height: 1.02;
    color: var(--navy);
    text-align: left;
    white-space: normal;
    overflow-wrap: break-word;
    padding: 18px 16px 20px;
    margin-top: auto;
}
.et .tool-stat-val small { font-size: 15px; font-weight: 500; color: var(--muted); margin-left: 4px; }
/* headline (first) column → red accent */
.et .tool-results .tool-stat:first-child { border-top-color: var(--red); }
.et .tool-results .tool-stat:first-child .tool-stat-label { color: var(--red-2); background: var(--red-wash); border-bottom-color: #F6CFD1; }
.et .tool-results .tool-stat:first-child .tool-stat-label span { color: #B4565B; }
.et .tool-results .tool-stat:first-child .tool-stat-val { color: var(--red); }
.et .tool-results .tool-stat:first-child .tool-stat-val small { color: #F2818A; }

/* inline "fill the inputs" hint injected by JS */
.et .tool-results .tool-note { grid-column: 1 / -1; border: 0; padding: 2px; }
.et .tool-note { font-family: var(--sans); font-size: 13px; color: var(--muted); line-height: 1.6; }

/* =====================================================================
   SUB-BLOCKS — framed panels
   ===================================================================== */
.et .tool-card { background: transparent; border: 0; border-radius: 0; box-shadow: none; padding: 0; margin: 0; }
.et .tool-card-title {
    font-family: var(--mono);
    font-weight: 500;
    font-size: 11.5px;
    letter-spacing: .07em;
    text-transform: uppercase;
    color: var(--navy);
    margin-bottom: 12px;
}

.et .tool-schematic,
.et .tool-chart {
    width: 100%;
    overflow-x: auto;
    background: var(--surface);
    border: 1px solid var(--line-2);
    border-radius: 0;
    padding: 12px;
}
.et .tool-schematic svg { min-width: 760px; display: block; }
.et .tool-chart svg { min-width: 560px; display: block; }
.et .tool-schematic .s-lbl { font-family: var(--mono); font-weight: 400; font-size: 10.5px; letter-spacing: .02em; fill: var(--ink-2); text-transform: uppercase; }
.et .tool-schematic .s-en { font-family: var(--mono); font-weight: 400; font-size: 9.5px; letter-spacing: .04em; fill: var(--muted); text-transform: uppercase; }
.et .tool-schematic .s-val { font-family: var(--mono); font-weight: 600; font-size: 14px; fill: var(--navy); }
.et .tool-schematic .s-loop { font-family: var(--mono); font-weight: 400; font-size: 9px; fill: var(--muted); letter-spacing: .16em; }
.et .tool-chart .ax { font-family: var(--mono); font-size: 10px; fill: var(--muted); }
.et .tool-chart .pt { font-family: var(--mono); font-size: 10.5px; font-weight: 500; }
.et .tool-chart .axt { font-family: var(--mono); font-size: 11px; font-weight: 500; letter-spacing: .04em; fill: var(--navy); text-transform: uppercase; }

.et .tool-legend { display: flex; flex-wrap: wrap; gap: 8px 22px; margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--line); }
.et .tool-legend .lg { display: inline-flex; align-items: center; gap: 8px; font-family: var(--mono); font-size: 11px; letter-spacing: .02em; color: var(--ink-2); text-transform: uppercase; }
.et .tool-legend .lg::before { content: ''; width: 10px; height: 10px; border-radius: 0; background: var(--c, var(--navy)); flex: 0 0 auto; }

/* =====================================================================
   TABLES — navy header bar, hairline rows, red selected row
   ===================================================================== */
.et .tool-table {
    background: var(--surface);
    border: 1px solid var(--line-2);
    border-radius: 0;
    box-shadow: none;
    overflow: hidden;
    margin: 0;
}
.et .tool-table > summary {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--mono);
    font-weight: 500;
    font-size: 11.5px;
    letter-spacing: .06em;
    text-transform: uppercase;
    color: #fff;
    background: var(--navy);
    border-left: 3px solid var(--red);
    padding: 12px 16px;
    cursor: pointer;
    list-style: none;
}
.et .tool-table > summary::-webkit-details-marker { display: none; }
.et .tool-table > summary::before { content: '+'; font-family: var(--mono); color: var(--red-on-navy); font-size: 14px; }
.et .tool-table[open] > summary::before { content: '\2212'; }
.et .tool-table .table-wrap { overflow-x: auto; padding: 0; }
.et .tool-table table.data { width: 100%; border-collapse: collapse; font-family: var(--mono); font-size: 13px; min-width: 620px; }
.et .tool-table table.data th {
    background: var(--navy-soft);
    color: var(--navy);
    font-family: var(--mono);
    font-weight: 500;
    font-size: 10.5px;
    letter-spacing: .05em;
    text-transform: uppercase;
    text-align: center;
    padding: 11px 10px;
    white-space: nowrap;
    border-bottom: 1px solid var(--line-2);
}
.et .tool-table table.data td { text-align: center; padding: 10px; border-top: 1px solid var(--line); color: var(--ink); background: var(--surface); }
.et .tool-table table.data tbody tr.is-on td { background: var(--red-wash); color: var(--navy); font-weight: 500; }
.et .tool-table table.data tbody tr.is-on td:first-child { box-shadow: inset 3px 0 0 var(--red); }
.et .tool-table .tool-note,
.et .tool-table .form-hint { padding: 12px 16px; background: var(--panel-2); border-top: 1px solid var(--line); margin: 0; }

/* =====================================================================
   FORMULA / DETAIL — framed panel
   ===================================================================== */
.et .tool-formula {
    display: flex;
    flex-direction: column;
    gap: 10px;
    background: var(--surface);
    border: 1px solid var(--line-2);
    border-radius: 0;
    padding: 18px 20px;
}
.et .tool-formula .fm { font-family: var(--sans); font-size: 14px; color: var(--ink); display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; line-height: 1.5; }
.et .tool-formula .fm-k {
    display: inline-flex;
    min-width: 40px;
    justify-content: center;
    font-family: var(--mono);
    font-weight: 500;
    font-size: 12px;
    color: var(--navy);
    background: var(--navy-soft);
    border: 1px solid var(--line-2);
    border-radius: 0;
    padding: 2px 8px;
}
.et .tool-formula .fm-note { font-family: var(--sans); font-size: 12.5px; color: var(--muted); margin-top: 4px; line-height: 1.7; }

/* =====================================================================
   PITOT multi-point table
   ===================================================================== */
.et .pit-wrap { width: 100%; overflow-x: auto; background: var(--surface); border: 1px solid var(--line-2); padding: 14px 16px; }
.et .pit-table { width: 100%; border-collapse: collapse; min-width: 560px; }
.et .pit-table thead th {
    font-family: var(--mono);
    font-weight: 500;
    font-size: 10.5px;
    letter-spacing: .05em;
    text-transform: uppercase;
    color: var(--navy);
    text-align: left;
    padding: 0 10px 12px;
    white-space: nowrap;
    border-bottom: 1px solid var(--line-2);
}
.et .pit-table thead th em { font-style: normal; color: var(--muted); }
.et .pit-table td { padding: 7px 10px; border-top: 1px solid var(--line); vertical-align: middle; }
.et .pit-table input,
.et .pit-table select {
    width: 100%;
    height: 42px;
    background: var(--surface);
    border: 1px solid var(--line-2);
    border-radius: 0;
    padding: 0 12px;
    font-family: var(--mono);
    font-size: 14px;
    color: var(--ink);
}
.et .pit-table select { font-family: var(--sans); appearance: none; -webkit-appearance: none; cursor: pointer; }
.et .pit-table input:focus,
.et .pit-table select:focus { outline: none; border-color: var(--red); box-shadow: inset 0 0 0 1px var(--red); }
.et .pit-table .pit-idx { font-family: var(--mono); color: var(--muted); font-weight: 500; text-align: center; }
.et .pit-table .pit-q { text-align: right; font-family: var(--mono); font-weight: 600; color: var(--navy); white-space: nowrap; }
.et .pit-del { border: 1px solid var(--line-2); background: var(--surface); color: var(--muted); width: 32px; height: 32px; border-radius: 0; cursor: pointer; font-size: 13px; transition: .14s; }
.et .pit-del:hover { border-color: var(--red); color: var(--red); }
.et .pit-add {
    margin-top: 14px;
    border: 1px solid var(--navy);
    background: var(--surface);
    color: var(--navy);
    font-family: var(--mono);
    font-weight: 500;
    font-size: 12.5px;
    letter-spacing: .04em;
    text-transform: uppercase;
    padding: 11px 18px;
    border-radius: 0;
    cursor: pointer;
    transition: .14s;
}
.et .pit-add:hover { background: var(--navy); color: #fff; }
.et .pit-total-card {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 16px;
    background: var(--navy);
    color: #fff;
    border-radius: 0;
    border-left: 4px solid var(--red);
    padding: 22px 26px;
    margin: 0;
    box-shadow: none;
}
.et .pit-total-label { font-family: var(--sans); font-weight: 600; font-size: 15px; }
.et .pit-total-label span { display: block; font-family: var(--mono); font-size: 11px; letter-spacing: .06em; text-transform: uppercase; color: var(--navy-on); margin-top: 3px; }
.et .pit-total-val { font-family: var(--mono); font-weight: 600; font-size: 46px; line-height: 1; color: var(--red-on-navy); }
.et .pit-total-val small { font-size: 16px; font-weight: 500; color: var(--navy-on); }

/* =====================================================================
   UNIT CONVERTER
   ===================================================================== */
.et .conv-row { display: grid; grid-template-columns: 1fr auto 1fr; gap: 18px; align-items: end; background: var(--surface); border: 1px solid var(--line-2); padding: 20px; }
.et .conv-side { display: flex; flex-direction: column; gap: 10px; min-width: 0; }
.et .conv-side input[type=number],
.et .conv-side select {
    width: 100%;
    height: 48px;
    background: var(--surface);
    border: 1px solid var(--line-2);
    border-radius: 0;
    padding: 0 14px;
    font-size: 16px;
    color: var(--ink);
}
.et .conv-side input[type=number] { font-family: var(--mono); font-weight: 500; }
.et .conv-side select { font-family: var(--sans); appearance: none; -webkit-appearance: none; cursor: pointer; }
.et .conv-side input:focus,
.et .conv-side select:focus { outline: none; border-color: var(--red); box-shadow: inset 0 0 0 1px var(--red); }
.et .conv-result {
    font-family: var(--mono);
    font-weight: 600;
    font-size: 24px;
    color: var(--red);
    background: var(--navy);
    border: 1px solid var(--navy);
    border-radius: 0;
    padding: 0 16px;
    height: 48px;
    display: flex;
    align-items: center;
    line-height: 1.1;
    word-break: break-word;
    overflow: hidden;
}
.et .conv-swap {
    flex: 0 0 auto;
    width: 44px;
    height: 44px;
    border-radius: 0;
    border: 1px solid var(--navy);
    background: var(--surface);
    color: var(--navy);
    font-size: 18px;
    cursor: pointer;
    transition: background .14s ease, color .14s ease;
    align-self: center;
}
.et .conv-swap:hover { background: var(--navy); color: #fff; }

/* =====================================================================
   FIRE PUMP — rated-capacity chips + headline value
   ===================================================================== */
.et .tool-slider-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 12px; margin-bottom: 14px; }
.et .tool-slider-head label { font-family: var(--sans); font-weight: 600; font-size: 14px; color: var(--navy); }
.et .tool-slider-value { display: flex; align-items: baseline; gap: 8px; font-family: var(--mono); font-weight: 600; font-size: 34px; color: var(--red); line-height: 1; }
.et .tool-slider-value em { font-style: normal; font-family: var(--mono); font-size: 12px; font-weight: 400; letter-spacing: .05em; text-transform: uppercase; color: var(--muted); }
.et .pump-chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 4px; }
.et .pump-chip {
    font-family: var(--mono);
    font-weight: 500;
    font-size: 13px;
    color: var(--ink-2);
    background: var(--surface);
    border: 1px solid var(--line-2);
    border-radius: 0;
    padding: 8px 12px;
    cursor: pointer;
    transition: .14s;
}
.et .pump-chip:hover { border-color: var(--navy); color: var(--navy); }
.et .pump-chip.is-on { background: var(--red); border-color: var(--red); color: #fff; }

/* =====================================================================
   ENGINEERING NOTE
   ===================================================================== */
.et .tool-disclaimer {
    background: var(--surface);
    border: 1px solid var(--line-2);
    border-left: 3px solid var(--red);
    border-radius: 0;
    padding: 16px 20px;
    font-family: var(--sans);
    font-size: 13px;
    line-height: 1.7;
    color: var(--ink-2);
}
.et .tool-disclaimer::before {
    content: 'NOTE — N-01';
    display: block;
    font-family: var(--mono);
    font-size: 10.5px;
    letter-spacing: .08em;
    color: var(--red);
    margin-bottom: 8px;
}
.et .tool-disclaimer b { color: var(--ink); font-weight: 600; }

/* =====================================================================
   LANDING INDEX — module directory panel
   ===================================================================== */
.et-index { max-width: 1040px; margin: 0 auto; }
.et-index-list { background: var(--surface); border: 1px solid var(--line-2); }
.et-index-item {
    display: grid;
    grid-template-columns: 74px 1fr auto;
    gap: 22px;
    align-items: baseline;
    padding: 24px 22px;
    border-bottom: 1px solid var(--line);
    border-left: 3px solid transparent;
    color: var(--ink);
    transition: background .14s ease, border-color .14s ease;
}
.et-index-item:last-child { border-bottom: 0; }
.et-index-item:hover { background: var(--navy-soft); border-left-color: var(--red); }
.et-index-num { font-family: var(--mono); font-size: 13px; color: var(--red); letter-spacing: .05em; }
.et-index-body { min-width: 0; }
.et-index-name { font-size: 21px; font-weight: 600; letter-spacing: -0.01em; color: var(--navy); margin: 0 0 6px; }
.et-index-desc { font-size: 14px; color: var(--ink-2); line-height: 1.6; margin: 0 0 8px; }
.et-index-std { font-family: var(--mono); font-size: 10.5px; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
.et-index-arrow { font-family: var(--mono); color: var(--muted); font-size: 18px; align-self: center; transition: color .14s ease, transform .14s ease; }
.et-index-item:hover .et-index-arrow { color: var(--red); transform: translateX(4px); }

/* =====================================================================
   RESPONSIVE
   ===================================================================== */
@media (max-width: 1023px) {
    .et { padding: 26px 18px 72px; }
    .et-wrap { grid-template-columns: 1fr; gap: 0; }
    .et-back { display: inline-block; }
    .et-nav { position: static; margin-bottom: 28px; overflow-x: auto; -webkit-overflow-scrolling: touch; }
    .et-nav-kicker { display: none; }
    .et-nav-list { display: flex; gap: 0; border-bottom: 2px solid var(--navy); }
    .et-nav-item a {
        grid-template-columns: auto;
        gap: 4px;
        white-space: nowrap;
        border-left: 0;
        border-bottom: 2px solid transparent;
        padding: 10px 14px;
        margin-bottom: -2px;
    }
    .et-nav-item .et-nav-num { display: none; }
    .et-nav-item.is-on a { border-left: 0; border-bottom-color: var(--red); background: transparent; }
    .et-title { font-size: 33px; }
    .et-head { margin-bottom: 32px; }
}
@media (max-width: 560px) {
    .et { padding: 20px 14px 60px; }
    .et-title { font-size: 26px; }
    .et-sub { font-size: 15px; }
    .et .tool-input { padding: 18px; }
    .et .tool-fields { grid-template-columns: 1fr; gap: 16px; }
    .et .tool-stat-val { font-size: 34px; }
    .et .conv-row { grid-template-columns: 1fr; gap: 14px; }
    .et .conv-swap { transform: rotate(90deg); justify-self: center; }
    .et .conv-swap:hover { transform: rotate(90deg); }
    .et-index-item { grid-template-columns: 48px 1fr; gap: 12px; padding: 18px 16px; }
    .et-index-arrow { display: none; }
    .et .pit-total-val { font-size: 36px; }
}