/* ============================================================
   RF TOOLS — calculator suite

   Lifted from the v2 stylesheet unchanged. Every .tool-* class
   name is load-bearing: assets/js/rf-tools.js binds to them and
   all fourteen calculators depend on the exact structure, so the
   rules are preserved verbatim rather than rewritten.

   Only the palette is re-pointed. The block below aliases the old
   v2 variable names onto the v3 tokens, so the calculators inherit
   the current surface (light or dark) without a single selector
   changing.
   ============================================================ */

.tools-scope {
    --bg:            var(--bg);
    --surface:       var(--bg-raised);
    --surface-hi:    var(--bg-inset);
    --border:        var(--line);
    --border-hi:     var(--line-strong);
    --text-1:        var(--fg);
    --text-2:        var(--fg-muted);
    --text-3:        var(--fg-subtle);
    --text-4:        var(--fg-faint);
    --rf-primary:    var(--accent);
    --rf-primary-dim:var(--accent);
    --rf-secondary:  var(--field);
    --rf-warn:       var(--hazard);
    --rf-ok:         var(--verified);
    --rf-danger:     var(--fault);
}

/* ------------------------------------------------------------ */

/* Tab nav */
.tools-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 2rem 0 2.5rem;
    padding: 0.45rem;
    background: rgba(12, 14, 20, 0.6);
    border: 1px solid var(--border);
    border-radius: 12px;
    backdrop-filter: blur(10px);
    position: sticky;
    top: 80px;
    z-index: 30;
}
.tools-tab {
    flex: 1 1 auto;
    padding: 0.55rem 1rem;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 7px;
    color: var(--text-3);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.65rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    cursor: pointer;
    transition: background .2s, color .2s, border-color .2s;
    white-space: nowrap;
    text-align: center;
}
.tools-tab:hover { color: var(--rf-primary); background: rgba(34, 211, 238, 0.04); }
.tools-tab.is-active {
    color: var(--bg);
    background: var(--rf-primary);
    border-color: var(--rf-primary);
    box-shadow: 0 0 18px rgba(34, 211, 238, 0.35);
}

/* Tool grid + card */
.tool-section { display: none; }
.tool-section.is-active { display: block; }

.tool-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}
@media (min-width: 768px) {
    .tool-grid { grid-template-columns: 1fr 1fr; }
    .tool-grid .tool-card.full { grid-column: 1 / -1; }
}

.tool-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    position: relative;
    transition: border-color .25s ease, box-shadow .25s ease;
}
.tool-card:hover {
    border-color: rgba(34, 211, 238, 0.2);
    box-shadow: 0 0 28px rgba(34, 211, 238, 0.05);
}

.tool-card-head {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.7rem 1rem;
    border-bottom: 1px solid var(--border);
    background: rgba(34, 211, 238, 0.025);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.65rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}
.tool-card-head .tc-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--rf-primary);
    box-shadow: 0 0 8px var(--rf-primary);
}
.tool-card-head .tc-id { color: var(--rf-primary); flex: 0 0 auto; }
.tool-card-head .tc-title { color: var(--text-1); flex: 1 1 auto; letter-spacing: 0.08em; }
.tool-card-head .tc-meta { color: var(--text-4); font-size: 0.6rem; }

.tool-card-body { padding: 1.1rem; }

.tool-tagline {
    color: var(--text-2);
    font-size: 0.78rem;
    line-height: 1.5;
    margin-bottom: 1rem;
}

.tool-row {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    margin-bottom: 0.85rem;
}
.tool-row-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.7rem;
    margin-bottom: 0.85rem;
}
.tool-row-grid .tool-row { margin-bottom: 0; }

.tool-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.6rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--text-3);
    display: flex;
    align-items: center;
    gap: 0.4rem;
}
.tool-label .lbl-unit { color: var(--text-4); font-size: 0.55rem; }

.tool-input-wrap {
    position: relative;
    display: flex;
    align-items: stretch;
}
.tool-input {
    flex: 1 1 auto;
    background: rgba(5, 6, 10, 0.6);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 0.55rem 0.75rem;
    color: var(--text-1);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    outline: none;
    transition: border-color .2s, box-shadow .2s, background .2s;
    min-width: 0;
    width: 100%;
}
.tool-input:focus {
    border-color: var(--rf-primary);
    box-shadow: 0 0 0 2px rgba(34, 211, 238, 0.15), inset 0 0 14px rgba(34, 211, 238, 0.04);
    background: rgba(5, 6, 10, 0.85);
}
.tool-input.is-output {
    cursor: not-allowed;
    color: var(--rf-primary);
    background: rgba(34, 211, 238, 0.04);
    border-color: rgba(34, 211, 238, 0.18);
}

.tool-input-suffix {
    flex: 0 0 auto;
    display: inline-flex;
    align-items: center;
    padding: 0 0.7rem;
    margin-left: 0.4rem;
    background: rgba(34, 211, 238, 0.06);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--rf-primary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    letter-spacing: 0.1em;
}

/* Select inline with input */
.tool-input-select {
    flex: 0 0 auto;
    width: auto;
    padding: 0.55rem 0.6rem;
    margin-left: 0.4rem;
    background: rgba(34, 211, 238, 0.04);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--rf-primary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    letter-spacing: 0.08em;
    cursor: pointer;
    outline: none;
}
.tool-input-select:focus { border-color: var(--rf-primary); }

/* Pill toggle row */
.tool-pills {
    display: inline-flex;
    gap: 0;
    padding: 0.18rem;
    background: rgba(5, 6, 10, 0.6);
    border: 1px solid var(--border);
    border-radius: 7px;
    margin-bottom: 0.85rem;
}
.tool-pill {
    padding: 0.3rem 0.7rem;
    background: transparent;
    border: none;
    color: var(--text-3);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.6rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    cursor: pointer;
    border-radius: 5px;
    transition: background .2s, color .2s;
}
.tool-pill:hover { color: var(--rf-primary); }
.tool-pill.is-active {
    color: var(--bg);
    background: var(--rf-primary);
}

/* Output banner */
.tool-output-banner {
    margin-top: 0.7rem;
    padding: 0.85rem 1rem;
    border: 1px solid rgba(34, 211, 238, 0.25);
    background: linear-gradient(135deg, rgba(34, 211, 238, 0.06), rgba(34, 211, 238, 0.015));
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}
.tool-output-banner .out-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.55rem;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--text-3);
}
.tool-output-banner .out-value {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 600;
    color: var(--rf-primary);
    font-size: 1.4rem;
    letter-spacing: 0.02em;
    word-break: break-all;
}
.tool-output-banner .out-sub {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    color: var(--text-2);
    letter-spacing: 0.08em;
}

/* Multi-output stack */
.tool-output-stack {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.5rem;
    margin-top: 0.7rem;
}
.tool-output-stack .out-line {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    padding: 0.5rem 0.75rem;
    background: rgba(5, 6, 10, 0.5);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-family: 'JetBrains Mono', monospace;
}
.tool-output-stack .out-line .ol-key {
    color: var(--text-3);
    font-size: 0.62rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
}
.tool-output-stack .out-line .ol-val {
    color: var(--rf-primary);
    font-size: 0.95rem;
    font-weight: 600;
}

.tool-eq {
    margin-top: 0.85rem;
    padding: 0.6rem 0.8rem;
    border-left: 2px solid var(--rf-secondary);
    background: rgba(167, 139, 250, 0.05);
    color: var(--text-2);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    letter-spacing: 0.04em;
    border-radius: 0 6px 6px 0;
    word-break: break-word;
}
.tool-eq strong { color: var(--rf-secondary); font-weight: 600; }

.tool-note {
    margin-top: 0.7rem;
    color: var(--text-3);
    font-size: 0.7rem;
    line-height: 1.5;
    font-style: italic;
}
.tool-note a { color: var(--rf-primary); }

/* Comparison table */
.tool-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 0.7rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.72rem;
}
.tool-table thead th {
    text-align: left;
    padding: 0.5rem 0.6rem;
    color: var(--text-3);
    font-weight: 500;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    font-size: 0.55rem;
    border-bottom: 1px solid var(--border);
    background: rgba(34, 211, 238, 0.025);
}
.tool-table thead th.r-fcc  { color: var(--rf-primary); }
.tool-table thead th.r-ised { color: var(--rf-secondary); }
.tool-table tbody td {
    padding: 0.5rem 0.6rem;
    border-bottom: 1px solid rgba(31, 36, 48, 0.6);
}
.tool-table tbody tr:last-child td { border-bottom: none; }
.tool-table tbody td.t-key { color: var(--text-2); }
.tool-table tbody td.t-fcc  { color: var(--rf-primary); font-weight: 600; }
.tool-table tbody td.t-ised { color: var(--rf-secondary); font-weight: 600; }

/* Tools hero */
.tools-hero {
    text-align: left;
    padding-bottom: 1.5rem;
}

/* Landing-page tools teaser */
.tools-teaser {
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 2rem;
    background: linear-gradient(135deg, rgba(34, 211, 238, 0.04) 0%, rgba(167, 139, 250, 0.03) 100%);
    position: relative;
    overflow: hidden;
}
.tools-teaser::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 80% 20%, rgba(34, 211, 238, 0.08), transparent 50%);
    pointer-events: none;
}
.tools-teaser-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    position: relative;
}
@media (min-width: 768px) {
    .tools-teaser-grid { grid-template-columns: 1.4fr 1fr; align-items: center; gap: 2.5rem; }
}
.tools-teaser-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.55rem;
}
.tools-teaser-pill {
    padding: 0.5rem 0.75rem;
    background: rgba(5, 6, 10, 0.5);
    border: 1px solid var(--border);
    border-radius: 7px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.62rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--rf-primary);
    transition: background .2s, border-color .2s, transform .2s;
    text-align: center;
}
.tools-teaser-pill:hover {
    background: rgba(34, 211, 238, 0.08);
    border-color: rgba(34, 211, 238, 0.4);
    transform: translateY(-2px);
}