/* Free Code Cleaner — v27 theme
   Design direction: a precision developer instrument, not a SaaS brochure.
   - Monospace display type gives headings a "terminal readout" character.
   - Palette is warm graphite + paper with one electric-lime signal accent,
     chosen to read as developer tooling and to avoid generic AI defaults.
   - The signature device is the mono command-line eyebrow (">_ label"). */

:root {
    color-scheme: light dark;

    /* Light: warm paper, ink text, lime signal */
    --bg: #f4f1ea;
    --bg-grain: #efeae0;
    --surface: #fbfaf6;
    --surface-2: #f0ece2;
    --surface-inset: #efece3;
    --ink: #1a1c18;
    --ink-muted: #55584f;
    --ink-soft: #5f6359;
    --line: #d8d2c4;
    --line-strong: #898578;
    --accent: #436b0e;          /* used for text/borders where lime is too light */
    --accent-bright: #84cc16;   /* the signal lime, used on dark chips */
    --accent-wash: #eaf3d4;
    --accent-ink: #1a2e05;
    --accent-wash-ink: #1a2e05;
    --ok: #15803d;
    --warn: #b45309;
    --err: #b91c1c;
    --focus: #1d4ed8;

    --shadow-sm: 0 1px 2px rgba(26, 28, 24, 0.06), 0 2px 8px rgba(26, 28, 24, 0.05);
    --shadow: 0 2px 4px rgba(26, 28, 24, 0.06), 0 12px 32px rgba(26, 28, 24, 0.09);

    --r-lg: 14px;
    --r-md: 10px;
    --r-sm: 7px;

    --s1: 0.25rem; --s2: 0.5rem; --s3: 0.75rem; --s4: 1rem;
    --s5: 1.5rem; --s6: 2rem; --s7: 3rem;

    --font-display: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --font-body: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, Consolas, monospace;
}

[data-theme="dark"] {
    color-scheme: dark;
    --bg: #12130f;
    --bg-grain: #16170f;
    --surface: #1b1d16;
    --surface-2: #22241b;
    --surface-inset: #14150f;
    --ink: #f0efe6;
    --ink-muted: #b6b8a8;
    --ink-soft: #989c8e;
    --line: #32352a;
    --line-strong: #747a63;
    --accent: #a3e635;
    --accent-bright: #bef264;
    --accent-wash: #262b16;
    --accent-ink: #1a2e05;
    --accent-wash-ink: #d9f99d;
    --ok: #86efac;
    --warn: #fbbf24;
    --err: #fca5a5;
    --focus: #93c5fd;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.4);
    --shadow: 0 2px 4px rgba(0,0,0,0.4), 0 16px 40px rgba(0,0,0,0.5);
}

* { box-sizing: border-box; }

html { min-height: 100%; scroll-behavior: smooth; }

body {
    min-height: 100%;
    margin: 0;
    color: var(--ink);
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.55;
    background-color: var(--bg);
    /* Faint engineering-grid texture: the "instrument" signature. */
    background-image:
        linear-gradient(var(--bg-grain) 1px, transparent 1px),
        linear-gradient(90deg, var(--bg-grain) 1px, transparent 1px);
    background-size: 2.5rem 2.5rem;
    background-position: -1px -1px;
}

button, input, select, textarea { font: inherit; color: inherit; }

a {
    color: var(--accent);
    font-weight: 600;
    text-underline-offset: 0.18em;
    text-decoration-thickness: 0.08em;
}
a:hover { color: var(--ink); }

:focus-visible {
    outline: 3px solid var(--focus);
    outline-offset: 2px;
    border-radius: 3px;
}

::selection { background: var(--accent-bright); color: var(--accent-ink); }

h1, h2, h3, p { margin: 0; }

h1, h2, h3 {
    font-family: var(--font-display);
    color: var(--ink);
    letter-spacing: -0.02em;
    line-height: 1.08;
    font-weight: 600;
}
h1 { max-width: 20ch; font-size: clamp(2.2rem, 5vw, 3.9rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.2rem); }
h3 { font-size: 1.02rem; }

.container { width: min(100% - 2rem, 84rem); margin-inline: auto; }

.skip-link {
    position: absolute; inset: 0.75rem auto auto 0.75rem; z-index: 100;
    min-height: 2.75rem; padding: 0.75rem 1rem;
    border-radius: var(--r-md);
    background: var(--accent-bright); color: var(--accent-ink);
    font-family: var(--font-mono); font-weight: 700;
    transform: translateY(-160%);
}
.skip-link:focus { transform: translateY(0); }

.visually-hidden {
    position: absolute !important; width: 1px !important; height: 1px !important;
    padding: 0 !important; margin: -1px !important; overflow: hidden !important;
    clip: rect(0,0,0,0) !important; white-space: nowrap !important; border: 0 !important;
}

/* ---------- Header ---------- */
.site-header {
    position: sticky; top: 0; z-index: 20;
    border-bottom: 1px solid var(--line);
    background: color-mix(in srgb, var(--bg) 88%, transparent);
    backdrop-filter: blur(12px);
}
.header-shell, .footer-shell {
    display: flex; align-items: center; justify-content: space-between;
    gap: var(--s4); padding-block: var(--s3);
}
.brand {
    display: inline-flex; min-height: 2.75rem; align-items: center;
    gap: var(--s3); color: var(--ink); text-decoration: none;
}
.brand-mark {
    display: inline-grid; width: 2.5rem; height: 2.5rem; place-items: center;
    border-radius: var(--r-sm);
    background: var(--ink); color: var(--accent-bright);
    font-family: var(--font-mono); font-size: 1rem; font-weight: 700;
    letter-spacing: 0.02em;
    transition: transform 150ms ease, border-radius 150ms ease;
}
.brand:hover .brand-mark { transform: rotate(-4deg) scale(1.04); border-radius: 12px 7px 12px 7px; }
[data-theme="dark"] .brand-mark { background: var(--accent-bright); color: var(--accent-ink); }
.brand-text { display: grid; gap: 0.05rem; }
.brand-text strong { font-family: var(--font-display); font-size: 1.02rem; letter-spacing: -0.01em; }
.brand-text span { font-family: var(--font-mono); font-size: 0.72rem; color: var(--ink-soft); }

.site-nav { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s1); }
.site-nav a {
    display: inline-flex; min-height: 2.5rem; align-items: center; gap: 0.42rem;
    padding: 0.5rem 0.75rem; border-radius: var(--r-sm);
    color: var(--ink-muted); font-family: var(--font-mono);
    font-size: 0.85rem; font-weight: 500; text-decoration: none;
}
.site-nav a:hover, .site-nav a:focus-visible { background: var(--surface-2); color: var(--ink); }

.theme-switch {
    display: inline-flex; min-height: 2.75rem; align-items: center; gap: 2px;
    padding: 3px; border: 1px solid var(--line-strong); border-radius: 999px;
    background: var(--surface);
}
.theme-option {
    display: inline-flex; min-height: 2.15rem; align-items: center; justify-content: center; gap: 0.38rem;
    border: 0; border-radius: 999px;
    padding: 0.4rem 0.85rem; background: transparent; color: var(--ink-muted);
    cursor: pointer; font-family: var(--font-mono); font-size: 0.82rem; font-weight: 600;
}
.theme-option[aria-pressed="true"] { background: var(--ink); color: var(--surface); }
[data-theme="dark"] .theme-option[aria-pressed="true"] { background: var(--accent-bright); color: var(--accent-ink); }

/* ---------- Layout ---------- */
.site-main { padding-block: var(--s6) var(--s7); }
.page-grid { display: grid; gap: var(--s5); }

.eyebrow {
    display: inline-block;
    font-family: var(--font-mono); font-size: 0.75rem; font-weight: 600;
    letter-spacing: 0.02em; color: var(--accent);
}
.eyebrow::before { content: ">_ "; opacity: 0.7; }
.ui-icon { width: 1.05em; flex: none; text-align: center; }
.eyebrow .ui-icon { width: auto; margin-right: 0.35rem; }
.heading-with-icon { display: inline-flex; align-items: center; gap: 0.55rem; }
.heading-with-icon .ui-icon { color: var(--accent); }

/* ---------- Cards ---------- */
.intro-card, .app-card, .info-card, .support-card, .metrics {
    border: 1px solid var(--line);
    border-radius: var(--r-lg);
    background: var(--surface);
    box-shadow: var(--shadow-sm);
}

.intro-card {
    position: relative; overflow: hidden;
    display: grid; grid-template-columns: minmax(0,1fr) auto; gap: var(--s5);
    align-items: end; padding: clamp(1.5rem, 4vw, 2.75rem);
    box-shadow: var(--shadow);
}
/* Corner registration mark — instrument detail */
.intro-card::after {
    content: ""; position: absolute; top: 1rem; right: 1rem;
    width: 1.25rem; height: 1.25rem;
    border-top: 2px solid var(--accent); border-right: 2px solid var(--accent);
    opacity: 0.5;
}
.intro-copy { display: grid; gap: var(--s4); }
.intro-copy h1 { margin-top: var(--s1); }
.intro-copy p { color: var(--ink-muted); max-width: 54ch; }
.intro-actions { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s2); }

/* ---------- Buttons ---------- */
.button {
    display: inline-flex; min-height: 2.75rem; align-items: center; justify-content: center;
    gap: var(--s2); border: 1px solid var(--line-strong); border-radius: var(--r-md);
    padding: 0.6rem 1.1rem; cursor: pointer;
    font-family: var(--font-mono); font-size: 0.9rem; font-weight: 600;
    text-decoration: none;
    transition: background-color 120ms ease, border-color 120ms ease, color 120ms ease, transform 120ms ease;
}
.button:hover { transform: translateY(-1px); }
.button-primary { border-color: var(--ink); background: var(--ink); color: var(--surface); }
.button-primary:hover { background: var(--accent-bright); border-color: var(--accent-bright); color: var(--accent-ink); }
[data-theme="dark"] .button-primary { background: var(--accent-bright); border-color: var(--accent-bright); color: var(--accent-ink); }
[data-theme="dark"] .button-primary:hover { background: var(--accent); border-color: var(--accent); }
.button-secondary { background: var(--surface); color: var(--ink); }
.button-secondary:hover, .button-ghost:hover { border-color: var(--accent); background: var(--accent-wash); color: var(--accent-wash-ink); }
[data-theme="dark"] .button-secondary:hover, [data-theme="dark"] .button-ghost:hover { color: var(--accent-wash-ink); }
.button-ghost { border-color: transparent; background: transparent; color: var(--ink-muted); }
button:disabled, .button[disabled] {
    cursor: not-allowed; opacity: 1; transform: none;
    border-color: var(--line-strong); background: var(--surface-2); color: var(--ink-soft);
}

/* ---------- Status ---------- */
.status-region {
    display: flex; align-items: center; gap: var(--s3);
    min-height: 3.25rem; padding: var(--s3) var(--s4);
    border: 1px solid var(--line); border-left: 3px solid var(--accent);
    border-radius: var(--r-md); background: var(--surface);
    color: var(--ink-muted); font-family: var(--font-mono); font-size: 0.88rem;
}
.status-region ul { margin: 0; padding-inline-start: 1.1rem; display: grid; gap: 2px; }
.status-region h2 { font-size: 0.88rem; }
.client-status-message { color: var(--ok); font-weight: 600; }

/* ---------- Workbench ---------- */
.card-header, .subsection-heading {
    display: flex; align-items: end; justify-content: space-between; gap: var(--s4);
    padding: var(--s5); border-bottom: 1px solid var(--line);
}
.card-header h2 { margin-top: var(--s1); }
.header-note { color: var(--ink-soft); font-family: var(--font-mono); font-size: 0.82rem; max-width: 34ch; }
.tool-shell { display: grid; }

.control-bar {
    display: grid;
    grid-template-columns: minmax(10rem, 0.8fr) minmax(16rem, 1.6fr) minmax(16rem, 1fr);
    gap: var(--s4); align-items: end;
    padding: var(--s5); border-bottom: 1px solid var(--line);
    background: var(--surface-2);
}
.field-group { display: grid; gap: var(--s2); }
.field-grow { min-width: min(100%, 20rem); }
.field-wide { grid-column: span 2; }
.field-group label, .field-label, .checkbox-group legend {
    color: var(--ink); font-family: var(--font-mono); font-size: 0.8rem; font-weight: 600;
}

.control-input, select, input[type="search"], input[type="text"], input[type="number"], textarea {
    width: 100%; border: 1px solid var(--line-strong); border-radius: var(--r-md);
    background: var(--surface); color: var(--ink);
}
.control-input, select, input[type="search"], input[type="text"], input[type="number"] {
    min-height: 3rem; padding: 0.6rem 0.75rem;
}
select:hover, .control-input:hover { border-color: var(--accent); }

textarea {
    min-height: 26rem; resize: vertical; padding: var(--s4);
    font-family: var(--font-mono); font-size: 0.9rem; line-height: 1.6; tab-size: 4;
    background: var(--surface-inset);
}
textarea[readonly] { background: var(--surface-inset); }

.action-group { display: grid; gap: var(--s2); }
.button-cluster { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s2); }
.file-loader { position: relative; overflow: hidden; }
.file-loader input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }

/* ---------- Advanced expander ---------- */
/* An inset band of the workbench: flush top border, recessed background, so it
   reads as part of the tool rather than a floating card. Holds the power-user
   actions (as grouped radios) and the regex controls. */
.advanced {
    border-top: 1px solid var(--line);
    background: var(--surface-inset);
}
.advanced-summary {
    display: flex; align-items: center; justify-content: space-between; gap: var(--s4);
    padding: var(--s4) var(--s5);
    cursor: pointer; list-style: none;
    -webkit-tap-highlight-color: transparent;
}
.advanced-summary::-webkit-details-marker { display: none; }
.advanced-summary-main { display: grid; gap: 2px; }
.advanced-summary-title { font-family: var(--font-display); font-weight: 600; font-size: 1.02rem; }
.advanced-hint {
    font-family: var(--font-mono); font-size: 0.78rem; color: var(--ink-soft);
    white-space: nowrap;
}
/* A rotating chevron cues expand/collapse. */
.advanced-summary::after {
    content: ""; flex: none; width: 0.6rem; height: 0.6rem;
    border-right: 2px solid var(--ink-soft); border-bottom: 2px solid var(--ink-soft);
    transform: rotate(45deg); transition: transform 150ms ease; margin-left: var(--s2);
}
.advanced[open] .advanced-summary::after { transform: rotate(-135deg); }
.advanced-summary:hover .advanced-summary-title { color: var(--accent); }

.advanced-body {
    padding: 0 var(--s5) var(--s5);
    border-top: 1px solid var(--line);
}
.adv-note {
    margin: 0; padding-top: var(--s4);
    font-family: var(--font-mono); font-size: 0.78rem; color: var(--ink-soft);
    max-width: 70ch;
}
.adv-actions {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
    gap: var(--s4); padding-top: var(--s4);
}
.adv-group { display: grid; gap: var(--s2); align-content: start; }
.adv-group-title {
    margin: 0; font-family: var(--font-mono); font-size: 0.74rem; font-weight: 600;
    letter-spacing: 0.04em; text-transform: uppercase; color: var(--accent);
}
.adv-options { display: flex; flex-wrap: wrap; gap: var(--s2); }
.adv-option {
    display: inline-flex; align-items: center; gap: 0.4rem;
    padding: 0.4rem 0.7rem 0.4rem 0.6rem;
    border: 1px solid var(--line-strong); border-radius: 999px;
    background: var(--surface); color: var(--ink-muted);
    font-size: 0.85rem; cursor: pointer;
    transition: border-color 120ms ease, background-color 120ms ease, color 120ms ease;
}
/* Leading toggle dot; becomes a checkmark when selected, so the chips clearly
   read as independent multi-select toggles rather than single-choice buttons. */
.adv-option::before {
    content: ""; flex: none; width: 0.9rem; height: 0.9rem;
    border: 1px solid var(--line-strong); border-radius: 4px;
    background: var(--surface);
    transition: background-color 120ms ease, border-color 120ms ease;
}
.adv-option:hover { border-color: var(--accent); color: var(--ink); }
.adv-option:hover::before { border-color: var(--accent); }
.adv-option input { position: absolute; opacity: 0; width: 0; height: 0; }
.adv-option:has(input:checked) {
    border-color: var(--accent); background: var(--accent-bright); color: var(--accent-ink);
    font-weight: 600;
}
.adv-option:has(input:checked)::before {
    background: var(--accent-ink); border-color: var(--accent-ink);
    /* white check drawn with a background image so it needs no extra element */
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'%3E%3Cpath fill='none' stroke='%23bef264' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' d='M2.5 6.2l2.3 2.3 4.7-4.9'/%3E%3C/svg%3E");
    background-repeat: no-repeat; background-position: center; background-size: 0.8rem;
}
.adv-option:has(input:focus-visible) { outline: 3px solid var(--focus); outline-offset: 2px; }

/* ---------- Regex panel (nested in Advanced) ---------- */
.regex-panel {
    margin-top: var(--s5);
    border-top: 1px dashed var(--line-strong);
}
.regex-panel .subsection-heading {
    padding: var(--s5) 0 0; border-bottom: 0;
}
.subsection-heading p { color: var(--ink-soft); font-family: var(--font-mono); font-size: 0.8rem; }
.regex-grid {
    display: grid; grid-template-columns: repeat(4, minmax(0,1fr));
    gap: var(--s4); padding: var(--s5) 0 0;
}
.checkbox-group {
    display: grid; gap: var(--s2); margin: 0; padding: var(--s4);
    border: 1px solid var(--line); border-radius: var(--r-md); background: var(--surface-2);
}
.checkbox-group label {
    display: flex; min-height: 1.9rem; align-items: center; gap: var(--s2);
    color: var(--ink-muted); font-family: var(--font-body); font-size: 0.9rem; font-weight: 500;
}
.checkbox-group input { width: 1.05rem; height: 1.05rem; accent-color: var(--accent); }

.detection-summary {
    margin: var(--s5) var(--s5) 0; padding: var(--s3) var(--s4);
    border: 1px dashed var(--line-strong); border-radius: var(--r-md);
    background: var(--accent-wash); color: var(--ink);
    font-family: var(--font-mono); font-size: 0.82rem;
}

/* ---------- Progress bar ---------- */
/* Processing is a single fast local transform with no real incremental
   events, so the bar is honest: an indeterminate sweep while work is in
   flight, then a quick fill to 100% on completion. */
.progress-bar {
    display: flex; align-items: center; gap: var(--s3);
    margin: var(--s5) var(--s5) 0;
}
.progress-track {
    position: relative; flex: 1; height: 6px; overflow: hidden;
    border-radius: 999px; background: var(--surface-2);
    border: 1px solid var(--line);
}
.progress-fill {
    position: absolute; inset: 0 auto 0 0;
    width: 100%; border-radius: 999px;
    background: var(--accent-bright);
    transform-origin: left center;
    transform: scaleX(0);
    transition: transform 200ms ease;
}
/* Indeterminate: a lime segment sweeps left-to-right while busy. */
.progress-bar.is-indeterminate .progress-fill {
    width: 40%; transform: none;
    animation: progress-sweep 1.05s ease-in-out infinite;
}
/* Determinate completion: fill the whole track. */
.progress-bar.is-complete .progress-fill {
    width: 100%; transform: scaleX(1);
    animation: none;
}
.progress-label {
    font-family: var(--font-mono); font-size: 0.78rem; color: var(--ink-soft);
    white-space: nowrap; min-width: 6.5rem;
}
@keyframes progress-sweep {
    0%   { left: -40%; }
    100% { left: 100%; }
}
@media (prefers-reduced-motion: reduce) {
    /* No sweep: show a steady partial fill so the busy state is still visible. */
    .progress-bar.is-indeterminate .progress-fill {
        width: 100%; left: 0; opacity: 0.55;
    }
}

/* ---------- Editors ---------- */
.editor-grid {
    display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1fr);
    gap: var(--s5); padding: var(--s5);
}
.panel {
    display: grid; overflow: hidden;
    border: 1px solid var(--line-strong); border-radius: var(--r-md);
    background: var(--surface);
}
.panel-heading {
    display: flex; align-items: center; justify-content: space-between; gap: var(--s3);
    padding: var(--s3) var(--s4); border-bottom: 1px solid var(--line);
    background: var(--surface-2);
}
.pill {
    display: inline-flex; min-height: 1.9rem; align-items: center;
    border: 1px solid var(--line-strong); border-radius: 999px; padding: 0.25rem 0.65rem;
    background: var(--surface); color: var(--ink-muted);
    font-family: var(--font-mono); font-size: 0.76rem; font-weight: 600; white-space: nowrap;
}
.editor-panel textarea { border: 0; border-radius: 0; }

/* ---------- Workbench bar (language + layout toggle) ---------- */
.workbench-bar {
    display: flex; flex-wrap: wrap; align-items: end; gap: var(--s4) var(--s5);
    padding: var(--s5); border-bottom: 1px solid var(--line);
    background: var(--surface-2);
}
.workbench-bar .field-group { gap: var(--s2); }
.detection-inline { align-self: end; }
.view-toggle-group { margin-left: auto; }
.view-toggle {
    display: inline-flex; gap: 2px; padding: 3px;
    border: 1px solid var(--line-strong); border-radius: 999px; background: var(--surface);
}
.view-option {
    min-height: 2.4rem; border: 0; border-radius: 999px; padding: 0.4rem 0.9rem;
    background: transparent; color: var(--ink-muted); cursor: pointer;
    font-family: var(--font-mono); font-size: 0.82rem; font-weight: 600;
}
.view-option[aria-pressed="true"] { background: var(--ink); color: var(--surface); }
[data-theme="dark"] .view-option[aria-pressed="true"] { background: var(--accent-bright); color: var(--accent-ink); }

/* ---------- Code area with line-number gutter ---------- */
.code-area { display: flex; align-items: stretch; background: var(--surface-inset); min-height: 0; }
.line-gutter {
    flex: none; width: 3.25rem; overflow: hidden;
    padding: var(--s4) 0.5rem var(--s4) 0;
    margin: 0; border-right: 1px solid var(--line-strong);
    background: var(--surface-2); color: var(--ink-soft);
    font-family: var(--font-mono); font-size: 0.9rem; line-height: 1.6;
    text-align: right; white-space: pre; user-select: none;
    tab-size: 4;
}
.code-area textarea {
    flex: 1; min-width: 0; border: 0; border-radius: 0; resize: vertical;
    min-height: 24rem; padding: var(--s4);
    font-family: var(--font-mono); font-size: 0.9rem; line-height: 1.6; tab-size: 4;
    background: var(--surface-inset); overflow: auto; white-space: pre;
}

/* Split vs stacked editor layouts */
.editor-grid[data-view="split"] { grid-template-columns: minmax(0,1fr) minmax(0,1fr); }
.editor-grid[data-view="stack"] { grid-template-columns: minmax(0,1fr); }

/* ---------- Options region (below the editors) ---------- */
.options-region { border-top: 1px solid var(--line); }
.options-bar {
    display: grid;
    grid-template-columns: minmax(16rem, 1.4fr) minmax(16rem, 1fr);
    gap: var(--s4); align-items: end;
    padding: var(--s5); border-bottom: 1px solid var(--line);
    background: var(--surface-2);
}
.options-panel { background: var(--surface-inset); }
.options-expander { border-top: 0; }
.options-expander .advanced-summary { background: var(--surface-inset); }
.options-expander .advanced-summary-title {
    display: inline-flex; align-items: center; gap: var(--s2);
}
.options-expander .advanced-summary-description {
    color: var(--ink-soft); font-family: var(--font-mono); font-size: 0.78rem;
}
.options-expander .advanced-body { padding: 0; }
.options-expander[open] .advanced-summary { border-bottom: 1px solid var(--line); }
.options-head { padding: var(--s5) var(--s5) 0; display: grid; gap: var(--s1); }
.options-note { color: var(--ink-soft); font-family: var(--font-mono); font-size: 0.78rem; max-width: 70ch; }
.options-panel .adv-actions { padding: var(--s4) var(--s5) var(--s5); }
.options-panel .regex-panel { margin: 0 var(--s5) var(--s5); }
.beautify-panel { margin: 0 var(--s5) var(--s5); border-top: 1px dashed var(--line-strong); }
.beautify-panel .subsection-heading { padding: var(--s5) 0 0; border-bottom: 0; }
.beautify-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr));
    gap: var(--s4); padding: var(--s5) 0 0;
}

/* Current nav item */
.site-nav a.is-current { background: var(--surface-2); color: var(--ink); }
.editor-meta {
    display: flex; flex-wrap: wrap; gap: var(--s3);
    padding: var(--s3) var(--s4); border-top: 1px solid var(--line);
    background: var(--surface-2); color: var(--ink-soft);
    font-family: var(--font-mono); font-size: 0.8rem;
}
.output-toolbar {
    display: flex; flex-wrap: wrap; gap: var(--s2);
    padding: var(--s4); border-top: 1px solid var(--line);
}

/* ---------- Metrics ---------- */
.metrics { padding: var(--s4) var(--s5); }
.metrics summary {
    cursor: pointer; color: var(--ink); font-family: var(--font-display); font-weight: 600;
    display: flex; justify-content: space-between; gap: var(--s3); align-items: center;
}
.metrics summary [data-fcc-metrics-empty] { color: var(--ink-soft); font-family: var(--font-mono); font-size: 0.8rem; font-weight: 500; }
.metric-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr));
    gap: var(--s3); margin-top: var(--s4);
}
.metric-card {
    border: 1px solid var(--line); border-radius: var(--r-md);
    padding: var(--s3) var(--s4); background: var(--surface-2);
}
.metric-label { font-family: var(--font-mono); font-size: 0.74rem; color: var(--ink-soft); }
.metric-card strong { display: block; margin-top: 2px; font-family: var(--font-display); font-size: 1.35rem; }

/* ---------- Details ---------- */
.details-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: var(--s4); }
.section-heading { grid-column: 1 / -1; }
.section-heading h2 { margin-top: var(--s1); }
.info-card { padding: var(--s5); }
.info-card.has-icon { position: relative; }
.card-icon {
    display: inline-grid; width: 2.5rem; height: 2.5rem; place-items: center;
    margin-bottom: var(--s3); border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--line));
    border-radius: 12px 8px 12px 8px; background: var(--accent-wash); color: var(--accent-wash-ink);
    font-size: 1.05rem; transition: transform 150ms ease, border-radius 150ms ease;
}
.info-card:hover .card-icon { transform: rotate(-3deg) translateY(-1px); border-radius: 8px 12px 8px 12px; }
.info-card h2, .info-card h3 { margin-bottom: var(--s2); }
.info-card p { color: var(--ink-muted); }

/* ---------- Support / monetization ---------- */
.support-card {
    display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(24rem, 1.1fr); align-items: center;
    gap: var(--s5); padding: clamp(1.25rem, 3vw, 2rem);
}
.support-copy { display: grid; gap: var(--s2); }
.support-copy h2 { font-size: clamp(1.3rem, 2.4vw, 1.8rem); }
.support-copy p { color: var(--ink-muted); max-width: 52ch; }
.support-actions { display: flex; flex-wrap: wrap; gap: var(--s3); }
.support-choice-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--s3); }
.support-choice {
    display: grid; grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; gap: var(--s3);
    min-height: 5.1rem; padding: var(--s3); border: 1px solid var(--line-strong); border-radius: var(--r-md);
    background: var(--surface-2); color: var(--ink); text-decoration: none; box-shadow: var(--shadow-sm);
    transition: transform 140ms ease, border-color 140ms ease, background-color 140ms ease;
}
.support-choice:hover, .support-choice:focus-visible {
    transform: translateY(-2px); border-color: var(--accent); background: var(--accent-wash); color: var(--accent-wash-ink);
}
.support-choice-icon {
    display: inline-grid; width: 2.65rem; height: 2.65rem; place-items: center;
    border-radius: 50%; background: var(--ink); color: var(--accent-bright); font-size: 1rem;
    transition: transform 150ms ease;
}
[data-theme="dark"] .support-choice-icon { background: var(--accent-bright); color: var(--accent-ink); }
.support-choice:hover .support-choice-icon, .support-choice:focus-visible .support-choice-icon { transform: rotate(-6deg) scale(1.06); }
.support-choice-copy { display: grid; gap: 0.12rem; min-width: 0; }
.support-choice-copy strong { font-family: var(--font-display); font-size: 1rem; }
.support-choice-copy small { color: var(--ink-muted); font-family: var(--font-mono); font-size: 0.72rem; font-weight: 500; }
.support-choice:hover .support-choice-copy small, .support-choice:focus-visible .support-choice-copy small { color: inherit; }
.support-choice-arrow { color: var(--accent); }
.support-choice:hover .support-choice-arrow, .support-choice:focus-visible .support-choice-arrow { transform: translateX(2px); }
.support-options-card { grid-column: 1 / -1; }
.support-unconfigured { margin: 0; color: var(--ink-muted); }
.support-unconfigured code { font-family: var(--font-mono); }
.button-coffee {
    border-color: #ffdd00; background: #ffdd00; color: #1a1c18;
}
.button-coffee:hover { background: #ffe533; border-color: #ffe533; color: #1a1c18; }
.button-patreon { border-color: var(--line-strong); }

/* Ad slot. Hidden until app.js confirms a publisher ID is set on <body>, at
   which point it gets `.is-active`. Reserves 90px so enabling ads never
   shifts layout. The dashed placeholder look only applies before activation. */
.ad-slot {
    display: none;
    margin: 0 auto;
    min-height: 90px; width: 100%; max-width: 728px;
    align-items: center; justify-content: center;
    border: 1px dashed var(--line-strong); border-radius: var(--r-md);
    background: var(--surface-2); color: var(--ink-soft);
    font-family: var(--font-mono); font-size: 0.78rem; text-align: center;
}
.ad-slot.is-active {
    display: flex;
    border: 0; background: transparent; min-height: 90px;
}
.ad-slot small { display: block; padding: var(--s3); }
.ad-slot .adsbygoogle { display: block; width: 100%; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--line); background: var(--surface); margin-top: var(--s5); }
.footer-shell { color: var(--ink-soft); font-family: var(--font-mono); font-size: 0.82rem; }
.footer-shell p { display: inline-flex; align-items: center; gap: 0.35rem; color: var(--ink-soft); }
.footer-links { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s2); }
.footer-links a {
    display: inline-flex; min-height: 2.4rem; align-items: center; gap: 0.38rem;
    padding: 0.4rem 0.7rem; border-radius: var(--r-sm);
    color: var(--ink-muted); text-decoration: none;
}
.footer-links a:hover, .footer-links a:focus-visible { background: var(--surface-2); color: var(--ink); }

/* ---------- Fullscreen output ---------- */
.is-fullscreen-output {
    position: fixed !important; inset: 1rem !important; z-index: 50 !important;
    min-height: auto !important; border: 2px solid var(--accent) !important;
    box-shadow: var(--shadow) !important;
}

/* ---------- Responsive ---------- */
@media (max-width: 64rem) {
    .header-shell, .footer-shell, .card-header, .subsection-heading, .support-card {
        align-items: stretch; flex-direction: column;
    }
    .support-card { grid-template-columns: 1fr; }
    .support-choice-grid { grid-template-columns: 1fr 1fr; }
    .intro-card { grid-template-columns: 1fr; align-items: start; }
    .control-bar, .editor-grid, .regex-grid, .details-grid { grid-template-columns: 1fr; }
    .editor-grid[data-view="split"] { grid-template-columns: 1fr; }
    .options-bar { grid-template-columns: 1fr; }
    .view-toggle-group { margin-left: 0; }
    .field-wide { grid-column: auto; }
}

@media (max-width: 40rem) {
    .container { width: min(100% - 1rem, 84rem); }
    .site-main { padding-block: var(--s4) var(--s6); }
    .site-nav { width: 100%; }
    .site-nav a, .theme-switch, .intro-actions .button { width: 100%; }
    .support-choice-grid { grid-template-columns: 1fr; }
    .theme-option { flex: 1; }
    .control-bar, .editor-grid, .regex-grid, .card-header, .subsection-heading {
        padding: var(--s4);
    }
    .detection-summary { margin: var(--s4); }
    textarea { min-height: 18rem; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        scroll-behavior: auto !important;
        transition: none !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }
}

/* ---------- Stripe support checkout ---------- */
.support-payment-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--s4);
}
.support-payment-card {
    display: grid;
    align-content: start;
    gap: var(--s4);
    scroll-margin-top: 6rem;
}
.support-option-icon { margin-bottom: 0; }
.support-payment-copy {
    display: grid;
    gap: var(--s2);
}
.support-payment-copy h2 {
    font-size: clamp(1.45rem, 3vw, 2rem);
}
.support-payment-copy p:last-child {
    color: var(--ink-muted);
}
.support-payment-form {
    display: grid;
    gap: var(--s4);
    padding-top: var(--s4);
    border-top: 1px solid var(--line);
}
.amount-control {
    position: relative;
}
.amount-prefix {
    position: absolute;
    top: 50%;
    left: 0.8rem;
    z-index: 1;
    color: var(--ink-muted);
    font-family: var(--font-mono);
    font-weight: 700;
    transform: translateY(-50%);
    pointer-events: none;
}
.amount-input {
    padding-left: 2rem !important;
    font-family: var(--font-mono);
    font-variant-numeric: tabular-nums;
}
.field-help {
    color: var(--ink-soft);
    font-family: var(--font-mono);
    font-size: 0.78rem;
}
.support-status {
    padding: var(--s4) var(--s5);
    border: 1px solid var(--line-strong);
    border-left-width: 4px;
    border-radius: var(--r-md);
    background: var(--surface);
    color: var(--ink);
    box-shadow: var(--shadow-sm);
}
.support-status code {
    font-family: var(--font-mono);
}
.support-status-success {
    border-left-color: var(--ok);
}
.support-status-error {
    border-left-color: var(--err);
}
.support-status-info {
    border-left-color: var(--focus);
}

@media (max-width: 64rem) {
    .support-payment-grid {
        grid-template-columns: 1fr;
    }
}

/* ---------- Search-focused supporting content ---------- */
.seo-section {
    display: grid;
    gap: var(--s5);
    content-visibility: auto;
    contain-intrinsic-size: auto 38rem;
}
.section-heading > p:last-child {
    max-width: 70ch;
    margin-top: var(--s2);
    color: var(--ink-muted);
}
.tool-category-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--s4);
    content-visibility: auto;
    contain-intrinsic-size: auto 42rem;
}
.tool-category-grid .info-card h2,
.tool-category-grid .info-card h3 {
    margin-bottom: var(--s2);
}
.prose-card {
    display: grid;
    gap: var(--s4);
    padding: var(--s5);
    border: 1px solid var(--line);
    border-radius: var(--r-lg);
    background: var(--surface);
    box-shadow: var(--shadow-sm);
}
.prose-card p {
    max-width: 78ch;
    color: var(--ink-muted);
}
.faq-list {
    display: grid;
    gap: var(--s3);
}
.faq-item {
    border: 1px solid var(--line);
    border-radius: var(--r-md);
    background: var(--surface);
    box-shadow: var(--shadow-sm);
}
.faq-item summary {
    display: flex; align-items: center; gap: var(--s3);
    min-height: 3.25rem;
    padding: var(--s4) var(--s5);
    cursor: pointer;
    color: var(--ink);
    font-family: var(--font-display);
    font-weight: 650;
}
.faq-item p {
    max-width: 78ch;
    padding: 0 var(--s5) var(--s5);
    color: var(--ink-muted);
}

@media (max-width: 64rem) {
    .tool-category-grid {
        grid-template-columns: 1fr;
    }
}