/* =============================================================
   ToolVerse — shared stylesheet
   Sections: 1 Tokens · 2 Reset · 3 Utilities · 4 Typography
   5 Header/Footer · 6 Buttons & forms · 7 Tool shell · 8 Cards
   9 Content blocks (FAQ, ad-slot, tables, alerts) · 10 Sections
   11 Responsive · 12 Reduced-motion · 13 Print
   ============================================================= */

/* =============================================================
   1. Tokens
   ============================================================= */
:root {
  --bg: #faf9f7;
  --bg-elevated: #ffffff;
  --surface: #ffffff;
  --surface-muted: #f3f2ef;
  --border: #e4e2dd;
  --border-strong: #d2cfc8;
  --text: #17181a;
  --text-muted: #57605d;
  --text-faint: #8a908c;
  --accent: #0f766e;
  --accent-strong: #0b5c56;
  --accent-soft: #e6f4f2;
  --accent-contrast: #ffffff;
  --danger: #dc2626;
  --danger-soft: #fdecec;
  --warning: #b45309;
  --warning-soft: #fdf3e3;
  --success: #15803d;
  --success-soft: #e8f7ec;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --shadow-sm: 0 1px 2px rgba(20, 24, 22, .06);
  --shadow-md: 0 10px 30px rgba(20, 24, 22, .08);
  --shadow-lg: 0 20px 60px rgba(20, 24, 22, .14);
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-display: "Manrope", var(--font-sans);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --header-h: 68px;
  --container-w: 1180px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #101513;
    --bg-elevated: #151d1a;
    --surface: #151d1a;
    --surface-muted: #1a2320;
    --border: #263430;
    --border-strong: #324540;
    --text: #f0f2f0;
    --text-muted: #a9b2ae;
    --text-faint: #76807c;
    --accent: #2dd4bf;
    --accent-strong: #5eead4;
    --accent-soft: #123331;
    --accent-contrast: #052e2b;
    --danger: #f87171;
    --danger-soft: #2a1616;
    --warning: #fbbf24;
    --warning-soft: #2a2011;
    --success: #4ade80;
    --success-soft: #12261a;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, .3);
    --shadow-md: 0 10px 30px rgba(0, 0, 0, .35);
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, .5);
  }
}
:root[data-theme="dark"] {
  --bg: #101513;
  --bg-elevated: #151d1a;
  --surface: #151d1a;
  --surface-muted: #1a2320;
  --border: #263430;
  --border-strong: #324540;
  --text: #f0f2f0;
  --text-muted: #a9b2ae;
  --text-faint: #76807c;
  --accent: #2dd4bf;
  --accent-strong: #5eead4;
  --accent-soft: #123331;
  --accent-contrast: #052e2b;
  --danger: #f87171;
  --danger-soft: #2a1616;
  --warning: #fbbf24;
  --warning-soft: #2a2011;
  --success: #4ade80;
  --success-soft: #12261a;
}

/* =============================================================
   2. Reset & base
   ============================================================= */
*, *::before, *::after { box-sizing: border-box; margin: 0; }
html { -webkit-text-size-adjust: 100%; tab-size: 2; color-scheme: light dark; overflow-x: clip; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
  overscroll-behavior-y: none;
}
img, svg, video, canvas { display: block; max-width: 100%; }
img { height: auto; }
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: none; }
a { color: inherit; text-decoration: none; }
p { text-wrap: pretty; }
h1, h2, h3, h4 { text-wrap: balance; line-height: 1.12; letter-spacing: -0.01em; font-family: var(--font-display); font-weight: 800; }
ul, ol { padding-left: 1.2em; }
label { display: block; }
input, select, textarea { font: inherit; color: inherit; }
::selection { background: var(--accent); color: var(--accent-contrast); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

.skip-link {
  position: fixed; top: -100px; left: 1rem;
  padding: .6rem 1rem; background: var(--accent); color: var(--accent-contrast);
  z-index: 9999; border-radius: 8px; font-weight: 600; transition: top .2s var(--ease-out);
}
.skip-link:focus { top: 1rem; }

/* =============================================================
   3. Utilities
   ============================================================= */
.container { width: min(100% - 2.4rem, var(--container-w)); margin-inline: auto; }
.container-narrow { width: min(100% - 2.4rem, 760px); margin-inline: auto; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
[hidden] { display: none !important; }
.stack > * + * { margin-top: var(--gap, 1rem); }
.cluster { display: flex; flex-wrap: wrap; align-items: center; gap: .6rem; }

/* =============================================================
   4. Typography
   ============================================================= */
.eyebrow {
  display: inline-flex; align-items: center; gap: .4rem;
  font-size: .8rem; font-weight: 700; letter-spacing: .04em; text-transform: uppercase;
  color: var(--accent-strong);
}
.h1 { font-size: clamp(1.9rem, 4.4vw, 3rem); max-width: 22ch; }
.h2 { font-size: clamp(1.5rem, 2.8vw, 2.1rem); }
.h3 { font-size: clamp(1.15rem, 1.8vw, 1.4rem); }
.lede { font-size: clamp(1.02rem, 1.6vw, 1.18rem); color: var(--text-muted); max-width: 62ch; }
.prose { max-width: 68ch; }
.prose p, .prose ul, .prose ol { margin-top: .95em; }
.prose h2 { margin-top: 2.2em; margin-bottom: .5em; }
.prose h3 { margin-top: 1.6em; margin-bottom: .4em; }
.prose a { color: var(--accent-strong); text-decoration: underline; text-underline-offset: 2px; }
.text-muted { color: var(--text-muted); }
.text-faint { color: var(--text-faint); }
.text-sm { font-size: .88rem; }

/* =============================================================
   5. Header & footer
   ============================================================= */
.site-header {
  position: sticky; top: 0; z-index: 100;
  height: var(--header-h);
  display: flex; align-items: center;
  border-bottom: 1px solid var(--border);
}
/* Blur lives on a pseudo-element, not the header itself: backdrop-filter on an
   ancestor creates a new containing block for position:fixed descendants
   (like the mobile #main-nav panel), which breaks its full-height overlay. */
.site-header::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px) saturate(140%);
  -webkit-backdrop-filter: blur(10px) saturate(140%);
}
@supports not (backdrop-filter: blur(1px)) {
  .site-header::before { background: var(--bg); }
}
.site-header .container { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.brand { display: flex; align-items: center; gap: .55rem; font-family: var(--font-display); font-weight: 800; font-size: 1.15rem; }
.brand-mark {
  width: 30px; height: 30px; border-radius: 9px;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  display: grid; place-items: center; color: var(--accent-contrast); flex: none;
}
.brand-mark svg { width: 18px; height: 18px; }
.main-nav { display: flex; align-items: center; gap: 1.6rem; }
.main-nav a { font-size: .95rem; font-weight: 600; color: var(--text-muted); transition: color .18s var(--ease-out); }
.main-nav a:hover, .main-nav a[aria-current="page"] { color: var(--text); }
.nav-toggle { display: none; width: 40px; height: 40px; border-radius: 10px; align-items: center; justify-content: center; border: 1px solid var(--border); }
.nav-toggle svg { width: 20px; height: 20px; }

.site-footer { border-top: 1px solid var(--border); margin-top: 5rem; padding-block: 3rem 2rem; background: var(--surface-muted); }
.footer-grid { display: grid; gap: 2.2rem; grid-template-columns: 1.2fr repeat(3, 1fr); }
@media (max-width: 959px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
.footer-col h3 { font-size: .82rem; text-transform: uppercase; letter-spacing: .05em; color: var(--text-faint); margin-bottom: .9rem; }
.footer-col ul { list-style: none; padding: 0; display: grid; gap: .55rem; }
.footer-col a { color: var(--text-muted); font-size: .92rem; }
.footer-col a:hover { color: var(--accent-strong); }
.footer-bottom {
  display: flex; flex-wrap: wrap; gap: .8rem 1.4rem; justify-content: space-between; align-items: center;
  margin-top: 2.6rem; padding-top: 1.6rem; border-top: 1px solid var(--border);
  font-size: .85rem; color: var(--text-faint);
}
.footer-bottom a { color: var(--text-faint); }
.footer-bottom a:hover { color: var(--text); }

/* =============================================================
   6. Buttons & forms
   ============================================================= */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  padding: .78rem 1.3rem; border-radius: var(--radius-sm); font-weight: 700; font-size: .96rem;
  transition: transform .16s var(--ease-out), box-shadow .16s var(--ease-out), background-color .16s var(--ease-out), border-color .16s var(--ease-out);
  border: 1px solid transparent; white-space: nowrap;
}
.btn svg { width: 18px; height: 18px; flex: none; }
.btn-primary { background: var(--accent); color: var(--accent-contrast); box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: var(--accent-strong); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-secondary { background: var(--surface); border-color: var(--border-strong); color: var(--text); }
.btn-secondary:hover { border-color: var(--accent); color: var(--accent-strong); }
.btn-ghost { color: var(--text-muted); }
.btn-ghost:hover { color: var(--text); }
.btn-lg { padding: 1rem 1.7rem; font-size: 1.05rem; width: 100%; }
.btn:disabled { opacity: .5; cursor: not-allowed; transform: none !important; }
.btn-block { width: 100%; }

.field { display: grid; gap: .4rem; }
.field label { font-size: .88rem; font-weight: 700; color: var(--text-muted); }
.field-hint { font-size: .8rem; color: var(--text-faint); }
input[type="text"], input[type="number"], input[type="email"], input[type="date"],
input[type="password"], input[type="search"], select, textarea {
  padding: .7rem .85rem; border-radius: var(--radius-sm); border: 1px solid var(--border-strong);
  background: var(--surface); color: var(--text); width: 100%;
}
textarea { resize: vertical; min-height: 6.5em; font-family: var(--font-sans); }
input:focus-visible, select:focus-visible, textarea:focus-visible { border-color: var(--accent); }
select { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='9'%3E%3Cpath d='M1 1l6 6 6-6' stroke='%2357605d' stroke-width='1.6' fill='none' fill-rule='evenodd'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right .9rem center; padding-right: 2.2rem; }

.field-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: .9rem; }

input[type="range"] { -webkit-appearance: none; width: 100%; height: 6px; border-radius: 99px; background: var(--surface-muted); border: 1px solid var(--border); }
input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; width: 20px; height: 20px; border-radius: 50%; background: var(--accent); border: 3px solid var(--accent-contrast); box-shadow: 0 0 0 1px var(--accent); cursor: pointer; }
input[type="range"]::-moz-range-thumb { width: 18px; height: 18px; border-radius: 50%; background: var(--accent); border: 3px solid var(--accent-contrast); box-shadow: 0 0 0 1px var(--accent); cursor: pointer; }

.toggle-group { display: inline-flex; padding: .25rem; border-radius: var(--radius-sm); background: var(--surface-muted); border: 1px solid var(--border); gap: .2rem; flex-wrap: wrap; }
.toggle-group button { padding: .5rem .95rem; border-radius: 7px; font-size: .88rem; font-weight: 700; color: var(--text-muted); }
.toggle-group button[aria-pressed="true"] { background: var(--surface); color: var(--accent-strong); box-shadow: var(--shadow-sm); }

.checkbox-row { display: flex; align-items: center; gap: .55rem; font-size: .92rem; font-weight: 600; }
.checkbox-row input { width: 18px; height: 18px; accent-color: var(--accent); }

.copy-btn { display: inline-flex; align-items: center; gap: .35rem; font-size: .85rem; font-weight: 700; color: var(--accent-strong); }
.copy-btn svg { width: 15px; height: 15px; }

/* =============================================================
   7. Tool shell (the component every tool page builds on)
   ============================================================= */
.tool-hero { padding-block: 2.4rem 1.6rem; }
.breadcrumbs { display: flex; flex-wrap: wrap; gap: .3rem; font-size: .84rem; color: var(--text-faint); margin-bottom: 1.1rem; }
.breadcrumbs a { color: var(--text-faint); }
.breadcrumbs a:hover { color: var(--accent-strong); }

.tool {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md); padding: clamp(1.1rem, 3vw, 2rem); margin-top: 1.6rem;
}
.tool-badges { display: flex; flex-wrap: wrap; gap: .55rem; margin-top: 1.1rem; }
.badge {
  display: inline-flex; align-items: center; gap: .4rem; padding: .4rem .7rem;
  border-radius: 99px; font-size: .8rem; font-weight: 700; background: var(--surface-muted); color: var(--text-muted);
  border: 1px solid var(--border);
}
.badge svg { width: 14px; height: 14px; flex: none; }
.badge-privacy { background: var(--accent-soft); color: var(--accent-strong); border-color: transparent; }

.dropzone {
  position: relative; border: 2px dashed var(--border-strong); border-radius: var(--radius-md);
  padding: clamp(1.6rem, 5vw, 3rem) 1.4rem; text-align: center; cursor: pointer;
  transition: border-color .18s var(--ease-out), background-color .18s var(--ease-out);
}
.dropzone:hover, .dropzone.is-dragover { border-color: var(--accent); background: var(--accent-soft); }
.dropzone input[type="file"] { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
.dropzone-icon { width: 46px; height: 46px; margin: 0 auto .9rem; color: var(--accent); }
.dropzone-title { font-weight: 700; font-size: 1.02rem; }
.dropzone-hint { color: var(--text-faint); font-size: .86rem; margin-top: .3rem; }

.tool [data-show] { display: none; }
.tool[data-state="idle"] [data-show="idle"],
.tool[data-state="loading-engine"] [data-show="loading-engine"],
.tool[data-state="working"] [data-show="working"],
.tool[data-state="done"] [data-show="done"],
.tool[data-state="error"] [data-show="error"] { display: block; }

.progress { height: 8px; border-radius: 99px; background: var(--surface-muted); overflow: hidden; border: 1px solid var(--border); }
.progress > span { display: block; height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent-strong)); width: 0%; transition: width .2s var(--ease-out); }
.progress-row { display: flex; align-items: center; gap: 1rem; margin-top: 1.1rem; }
.progress-row .progress { flex: 1; }
.status-line { display: flex; align-items: center; gap: .6rem; font-size: .92rem; color: var(--text-muted); margin-top: .8rem; }
.spinner { width: 18px; height: 18px; border-radius: 50%; border: 2.5px solid var(--border-strong); border-top-color: var(--accent); animation: spin 0.8s linear infinite; flex: none; }
@keyframes spin { to { transform: rotate(360deg); } }

.result-panel { text-align: center; padding: 1.2rem 0 .4rem; }
.result-figure { display: flex; flex-wrap: wrap; gap: 1rem; justify-content: center; margin-bottom: 1.2rem; }
.result-card { background: var(--surface-muted); border: 1px solid var(--border); border-radius: var(--radius-md); padding: 1rem; max-width: 320px; }
.result-stat { font-family: var(--font-display); font-size: 1.5rem; font-weight: 800; color: var(--accent-strong); }
.download-btn { font-size: 1.05rem; padding: 1rem 1.8rem; }
.reset-link { display: inline-block; margin-top: 1.1rem; font-size: .9rem; font-weight: 700; color: var(--text-muted); }
.reset-link:hover { color: var(--accent-strong); }

.error-panel { text-align: center; padding: 1.4rem 0; }
.error-panel .icon { width: 42px; height: 42px; color: var(--danger); margin: 0 auto .8rem; }

.noscript-note {
  background: var(--warning-soft); border: 1px solid color-mix(in srgb, var(--warning) 35%, transparent);
  color: var(--text); border-radius: var(--radius-md); padding: 1rem 1.2rem; font-size: .92rem;
}

.file-row {
  display: flex; align-items: center; gap: .8rem; padding: .7rem .8rem; border: 1px solid var(--border);
  border-radius: var(--radius-sm); background: var(--surface-muted); margin-top: .6rem;
}
.file-row .name { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: 600; font-size: .9rem; }
.file-row .meta { font-size: .8rem; color: var(--text-faint); flex: none; }
.file-row .row-actions { display: flex; gap: .3rem; flex: none; }
.file-row .row-actions button { width: 30px; height: 30px; border-radius: 7px; display: grid; place-items: center; color: var(--text-muted); }
.file-row .row-actions button:hover { background: var(--surface); color: var(--text); }
.file-row .row-actions svg { width: 16px; height: 16px; }

/* Responsive layout helpers for tool panels (form+preview, from/to converters,
   before/after comparisons) — these replace ad-hoc inline grid styles so they
   actually collapse to one column on mobile instead of overlapping. */
.split-panel {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(240px, 300px);
  gap: 2rem; align-items: start;
}
@media (max-width: 719px) {
  .split-panel { grid-template-columns: 1fr; gap: 1.4rem; }
}

.convert-row {
  display: grid; grid-template-columns: 1fr auto 1fr; gap: 1rem; align-items: end;
  margin-top: 1.4rem;
}
@media (max-width: 539px) {
  .convert-row { grid-template-columns: 1fr; }
  .convert-row .btn { justify-self: center; }
}

.compare-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1.2rem; }
@media (max-width: 539px) {
  .compare-2 { grid-template-columns: 1fr; }
}

/* =============================================================
   8. Cards (tool grid, related tools, feature cards)
   ============================================================= */
.tool-grid { display: grid; gap: 1.1rem; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); margin-top: 1.6rem; }
.tool-card {
  display: flex; flex-direction: column; gap: .65rem; padding: 1.3rem;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-md);
  transition: transform .18s var(--ease-out), box-shadow .18s var(--ease-out), border-color .18s var(--ease-out);
}
.tool-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: var(--border-strong); }
.tool-card-icon { width: 42px; height: 42px; border-radius: 11px; background: var(--accent-soft); color: var(--accent-strong); display: grid; place-items: center; }
.tool-card-icon svg { width: 22px; height: 22px; }
.tool-card h3 { font-size: 1.03rem; }
.tool-card p { font-size: .87rem; color: var(--text-muted); }
.tool-card .tag { font-size: .72rem; font-weight: 700; text-transform: uppercase; letter-spacing: .04em; color: var(--text-faint); }

.related-tools { margin-top: 3rem; }

.step-list { display: grid; gap: 1.1rem; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); margin-top: 1.4rem; }
.step { padding: 1.2rem; border: 1px solid var(--border); border-radius: var(--radius-md); background: var(--surface); }
.step-num { width: 30px; height: 30px; border-radius: 50%; background: var(--accent-soft); color: var(--accent-strong); font-weight: 800; display: grid; place-items: center; font-size: .9rem; margin-bottom: .7rem; }
.step h3 { font-size: .98rem; margin-bottom: .3rem; }
.step p { font-size: .87rem; color: var(--text-muted); }

/* =============================================================
   9. Content blocks
   ============================================================= */
.ad-slot {
  display: flex; align-items: center; justify-content: center; min-height: 100px;
  border: 1px dashed var(--border-strong); border-radius: var(--radius-md);
  color: var(--text-faint); font-size: .78rem; font-weight: 700; text-transform: uppercase; letter-spacing: .06em;
  background: var(--surface-muted); margin-block: 2.2rem;
}

.faq { margin-top: 1.4rem; display: grid; gap: .6rem; }
.faq details {
  border: 1px solid var(--border); border-radius: var(--radius-md); padding: 1rem 1.15rem; background: var(--surface);
}
.faq summary {
  cursor: pointer; font-weight: 700; font-size: .98rem; list-style: none;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary .chev { width: 18px; height: 18px; color: var(--text-faint); transition: transform .2s var(--ease-out); flex: none; }
.faq details[open] summary .chev { transform: rotate(180deg); }
.faq p { margin-top: .7rem; color: var(--text-muted); font-size: .92rem; }

.alert { display: flex; gap: .7rem; padding: .9rem 1.05rem; border-radius: var(--radius-md); border: 1px solid transparent; font-size: .9rem; }
.alert svg { width: 19px; height: 19px; flex: none; margin-top: .1rem; }
.alert-info { background: var(--accent-soft); color: var(--accent-strong); }
.alert-warning { background: var(--warning-soft); color: var(--warning); }
.alert-danger { background: var(--danger-soft); color: var(--danger); }

table.data-table { width: 100%; border-collapse: collapse; font-size: .88rem; }
.data-table th, .data-table td { padding: .55rem .7rem; text-align: right; border-bottom: 1px solid var(--border); }
.data-table th:first-child, .data-table td:first-child { text-align: left; }
.data-table thead th { color: var(--text-faint); font-size: .76rem; text-transform: uppercase; letter-spacing: .04em; }
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius-md); margin-top: 1rem; }
.table-wrap table { margin: 0; }

.stat-grid { display: grid; gap: .9rem; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); margin-top: 1.3rem; }
.stat-box { padding: 1.1rem; border-radius: var(--radius-md); background: var(--surface-muted); border: 1px solid var(--border); }
.stat-box .label { font-size: .78rem; color: var(--text-faint); font-weight: 700; text-transform: uppercase; letter-spacing: .03em; }
.stat-box .value { font-family: var(--font-display); font-size: 1.4rem; font-weight: 800; margin-top: .25rem; }

/* =============================================================
   10. Sections
   ============================================================= */
.section { padding-block: 3.4rem; }
.section-head { max-width: 640px; margin-bottom: .4rem; }
.hero {
  padding-block: clamp(2.6rem, 7vw, 4.6rem) 2.2rem;
  background: radial-gradient(120% 140% at 15% -10%, var(--accent-soft), transparent 60%);
}
.hero .h1 { max-width: 18ch; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 1.6rem; }
.hero-stats { display: flex; flex-wrap: wrap; gap: 1.6rem 2.4rem; margin-top: 2.2rem; }
.hero-stats .value { font-family: var(--font-display); font-weight: 800; font-size: 1.5rem; color: var(--accent-strong); }
.hero-stats .label { font-size: .82rem; color: var(--text-faint); }

.category-filter { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 1.6rem; }
.category-filter button {
  padding: .5rem 1rem; border-radius: 99px; border: 1px solid var(--border-strong); font-size: .86rem; font-weight: 700; color: var(--text-muted);
}
.category-filter button[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: var(--accent-contrast); }

/* =============================================================
   11. Responsive
   ============================================================= */
@media (max-width: 719px) {
  .main-nav { position: fixed; inset: var(--header-h) 0 0 0; background: var(--bg); flex-direction: column; align-items: flex-start;
    padding: 1.6rem 1.4rem; gap: .2rem; transform: translateX(100%); transition: transform .25s var(--ease-out); overflow-y: auto; }
  .main-nav.is-open { transform: translateX(0); }
  .main-nav a { padding: .8rem 0; width: 100%; border-bottom: 1px solid var(--border); font-size: 1.05rem; }
  .nav-toggle { display: inline-flex; }
  .footer-grid { grid-template-columns: 1fr; }
}
@media (min-width: 720px) { .container { width: min(100% - 3.2rem, var(--container-w)); } }
@media (min-width: 960px) { }
@media (min-width: 1280px) { }

/* =============================================================
   12. Reduced motion — only intrusive effects gate
   ============================================================= */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .spinner { animation-duration: 1.6s; }
}

/* =============================================================
   13. Print (amortization tables, etc.)
   ============================================================= */
@media print {
  .site-header, .site-footer, .ad-slot, .hero-actions, .tool-badges, .reset-link, .category-filter { display: none !important; }
  body { background: #fff; color: #000; }
  .tool { box-shadow: none; border: none; }
}