/* ==========================================================================
   SEO4US — Design System
   Font: Montserrat · Palette: Indigo/Blue · Light + Dark themes
   ========================================================================== */

:root {
  --brand: #4f46e5;
  --brand-600: #4338ca;
  --brand-100: #e0e7ff;
  --brand-soft: rgba(79, 70, 229, 0.08);
  --accent: #0ea5e9;
  --ok: #16a34a;
  --warn: #d97706;
  --bad: #dc2626;

  --bg: #f8fafc;
  --surface: #ffffff;
  --surface-2: #f1f5f9;
  --text: #0f172a;
  --text-2: #475569;
  --text-3: #94a3b8;
  --border: #e2e8f0;
  --shadow: 0 1px 3px rgba(15, 23, 42, .06), 0 4px 14px rgba(15, 23, 42, .05);
  --shadow-lg: 0 8px 30px rgba(15, 23, 42, .12);

  --radius: 14px;
  --radius-sm: 8px;
  --header-h: 64px;
  --sidebar-w: 280px;
  --maxw: 1360px;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

[data-theme="dark"] {
  --brand: #818cf8;
  --brand-600: #6366f1;
  --brand-100: #1e1b4b;
  --brand-soft: rgba(129, 140, 248, 0.12);
  --bg: #0b1120;
  --surface: #111a2e;
  --surface-2: #1a2540;
  --text: #e2e8f0;
  --text-2: #94a3b8;
  --text-3: #64748b;
  --border: #24304d;
  --shadow: 0 1px 3px rgba(0, 0, 0, .4), 0 4px 14px rgba(0, 0, 0, .3);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, .5);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: 'Montserrat', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 15.5px;
  -webkit-font-smoothing: antialiased;
  transition: background .3s var(--ease), color .3s var(--ease);
}

img { max-width: 100%; }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3, h4 { line-height: 1.25; font-weight: 700; margin: 0 0 .5em; }
h1 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); letter-spacing: -.02em; }
h2 { font-size: clamp(1.25rem, 2.5vw, 1.6rem); }
h3 { font-size: 1.12rem; }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 200;
  background: var(--brand); color: #fff; padding: 10px 18px; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  height: var(--header-h);
  background: color-mix(in srgb, var(--surface) 85%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center;
}
.header-inner {
  width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px;
  display: flex; align-items: center; gap: 18px;
}
.logo {
  display: flex; align-items: center; gap: 9px;
  font-weight: 800; font-size: 1.25rem; letter-spacing: -.03em;
  color: var(--text) !important; text-decoration: none !important; white-space: nowrap;
}
.logo .logo-badge {
  width: 34px; height: 34px; border-radius: 9px; flex: none;
  background: linear-gradient(135deg, var(--brand), var(--accent));
  color: #fff; display: grid; place-items: center; font-size: 1rem; font-weight: 800;
}
.logo em { font-style: normal; color: var(--brand); }

.main-nav { display: flex; gap: 4px; margin-left: 6px; }
.main-nav a {
  padding: 8px 13px; border-radius: 8px; font-weight: 600; font-size: .88rem;
  color: var(--text-2); text-decoration: none !important; transition: all .18s var(--ease);
}
.main-nav a:hover, .main-nav a[aria-current="page"] { color: var(--brand); background: var(--brand-soft); }

.header-search { position: relative; flex: 1; max-width: 420px; margin-left: auto; }
.header-search input {
  width: 100%; height: 40px; padding: 0 14px 0 40px;
  border: 1.5px solid var(--border); border-radius: 999px;
  background: var(--surface-2); color: var(--text);
  font-family: inherit; font-size: .9rem; outline: none;
  transition: border-color .2s, box-shadow .2s;
}
.header-search input:focus { border-color: var(--brand); box-shadow: 0 0 0 4px var(--brand-soft); background: var(--surface); }
.header-search .search-ico { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); color: var(--text-3); pointer-events: none; }
.search-results {
  position: absolute; top: calc(100% + 8px); left: 0; right: 0; z-index: 120;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow-lg); max-height: 420px; overflow-y: auto; display: none;
}
.search-results.open { display: block; animation: pop .18s var(--ease); }
.search-results a {
  display: flex; gap: 11px; align-items: center; padding: 11px 15px;
  color: var(--text) !important; text-decoration: none !important;
  border-bottom: 1px solid var(--border); font-size: .88rem;
}
.search-results a:last-child { border-bottom: 0; }
.search-results a:hover, .search-results a.active { background: var(--brand-soft); }
.search-results .sr-cat { margin-left: auto; font-size: .7rem; color: var(--text-3); white-space: nowrap; }
.search-results .sr-empty { padding: 16px; color: var(--text-3); font-size: .88rem; text-align: center; }

.icon-btn {
  width: 40px; height: 40px; flex: none; border-radius: 10px;
  border: 1.5px solid var(--border); background: var(--surface); color: var(--text-2);
  display: grid; place-items: center; cursor: pointer; font-size: 1.05rem;
  transition: all .18s var(--ease);
}
.icon-btn:hover { border-color: var(--brand); color: var(--brand); transform: translateY(-1px); }

/* ---------- Layout: main + sidebar ---------- */
.page {
  max-width: var(--maxw); margin: 0 auto; padding: 14px 14px 40px;
  display: grid; grid-template-columns: minmax(0, 1fr) var(--sidebar-w);
  gap: 28px; align-items: start;
  transition: grid-template-columns .3s var(--ease);
}
.page.sidebar-collapsed { grid-template-columns: minmax(0, 1fr) 0; gap: 0; }
.page.sidebar-collapsed .sidebar { opacity: 0; pointer-events: none; transform: translateX(16px); }
.page.no-sidebar { grid-template-columns: minmax(0, 1fr); }

.content { min-width: 0; }

/* ---------- Sidebar ---------- */
.sidebar {
  position: sticky; top: calc(var(--header-h) + 20px);
  display: flex; flex-direction: column; gap: 18px;
  transition: opacity .25s var(--ease), transform .25s var(--ease);
}
.side-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 15px; box-shadow: var(--shadow);
}
.side-card h3 { font-size: .8rem; text-transform: uppercase; letter-spacing: .08em; color: var(--text-3); margin-bottom: 12px; }

.social-row { display: flex; gap: 8px; flex-wrap: nowrap; }
.social-row a {
  width: 38px; height: 38px; border-radius: 50%; display: grid; place-items: center;
  flex: none; color: #fff; text-decoration: none !important;
  transition: transform .2s var(--ease), box-shadow .2s var(--ease);
}
.social-row a:hover { transform: translateY(-3px) scale(1.06); box-shadow: var(--shadow); }
.social-row svg { width: 16px; height: 16px; fill: currentColor; }
.social-row .s-fb { background: #1877f2; }
.social-row .s-x { background: #000000; }
.social-row .s-li { background: #0a66c2; }
.social-row .s-wa { background: #25d366; }
.social-row .s-em { background: #5b6474; }

/* AdSense slot — clearly labeled, distinct from content (policy compliant) */
.ad-slot {
  background: var(--surface); border: 1px dashed var(--border);
  border-radius: var(--radius); padding: 14px; text-align: center;
}
.ad-slot .ad-label {
  display: block; font-size: .66rem; text-transform: uppercase; letter-spacing: .14em;
  color: var(--text-3); margin-bottom: 10px;
}
.ad-slot .ad-space {
  min-height: 250px; display: grid; place-items: center;
  background: var(--surface-2); border-radius: var(--radius-sm);
  color: var(--text-3); font-size: .78rem;
}

.side-toollist { display: flex; flex-direction: column; gap: 2px; }
.side-toollist a {
  display: flex; align-items: center; gap: 9px; padding: 8px 10px; border-radius: 8px;
  color: var(--text-2) !important; text-decoration: none !important; font-size: .85rem; font-weight: 500;
  transition: all .15s var(--ease);
}
.side-toollist a:hover { background: var(--brand-soft); color: var(--brand) !important; }

/* ---------- Back to tools button ---------- */
.back-btn {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 8px 16px; margin-bottom: 14px; border-radius: 999px;
  background: var(--brand-soft); color: var(--brand) !important;
  font-weight: 700; font-size: .84rem; text-decoration: none !important;
  border: 1.5px solid transparent; transition: all .18s var(--ease);
}
.back-btn:hover { border-color: var(--brand); transform: translateX(-3px); }

/* ---------- Breadcrumbs ---------- */
.breadcrumbs { margin-bottom: 14px; font-size: .82rem; color: var(--text-3); }
.breadcrumbs ol { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 4px; align-items: center; }
.breadcrumbs li + li::before { content: "›"; margin: 0 7px 0 3px; color: var(--text-3); }
.breadcrumbs a { color: var(--text-2); }
.breadcrumbs [aria-current] { color: var(--text); font-weight: 600; }

/* ---------- Hero ---------- */
.hero {
  text-align: center; padding: 44px 20px 38px; margin-bottom: 30px;
  background:
    radial-gradient(600px 300px at 20% 0%, var(--brand-soft), transparent),
    radial-gradient(600px 300px at 80% 0%, rgba(14,165,233,.07), transparent);
  border-radius: 0;
}
.hero h1 { margin-bottom: 12px; }
.hero h1 em { font-style: normal; background: linear-gradient(90deg, var(--brand), var(--accent)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p { color: var(--text-2); max-width: 620px; margin: 0 auto 26px; font-size: 1.02rem; }
.hero-search { position: relative; max-width: 560px; margin: 0 auto; }
.hero-search input {
  width: 100%; height: 54px; padding: 0 20px 0 50px;
  border: 2px solid var(--border); border-radius: 999px;
  background: var(--surface); color: var(--text); font-family: inherit; font-size: 1rem;
  box-shadow: var(--shadow); outline: none; transition: border-color .2s, box-shadow .2s;
}
.hero-search input:focus { border-color: var(--brand); box-shadow: 0 0 0 5px var(--brand-soft); }
.hero-search .search-ico { position: absolute; left: 19px; top: 50%; transform: translateY(-50%); color: var(--text-3); }
.hero-stats { display: flex; gap: 26px; justify-content: center; margin-top: 26px; flex-wrap: wrap; }
.hero-stats div { font-size: .82rem; color: var(--text-3); }
.hero-stats strong { display: block; font-size: 1.35rem; color: var(--text); }

/* ---------- Category filter pills ---------- */
.filter-bar {
  display: flex; gap: 8px; flex-wrap: wrap; justify-content: space-between; margin: 0 0 22px;
  position: sticky; top: calc(var(--header-h) + 8px); z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px); padding: 8px 0; border-radius: 12px;
}
.filter-bar .filter-pill { flex: 1 1 auto; text-align: center; }
.filter-pill {
  padding: 8px 14px; border-radius: 999px; cursor: pointer;
  border: 1.5px solid var(--border); background: var(--surface); color: var(--text-2);
  font-family: inherit; font-weight: 600; font-size: .84rem;
  transition: all .18s var(--ease);
}
.filter-pill:hover { border-color: var(--brand); color: var(--brand); transform: translateY(-1px); }
.filter-pill.active { background: var(--brand); border-color: var(--brand); color: #fff; box-shadow: 0 4px 14px var(--brand-soft); }
.filter-pill .cnt { opacity: .65; font-weight: 500; margin-left: 4px; font-size: .78rem; }

/* ---------- Tool cards ---------- */
.cat-section { margin-bottom: 30px; }
.cat-section > header { display: flex; align-items: baseline; gap: 12px; margin-bottom: 16px; }
.cat-section > header p { margin: 0; color: var(--text-3); font-size: .86rem; }

/* 5 tools per row everywhere on desktop (home, categories, related) */
.tool-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; }
@media (max-width: 1024px) { .tool-grid { grid-template-columns: repeat(4, 1fr); } }
@media (max-width: 820px)  { .tool-grid { grid-template-columns: repeat(3, 1fr); } }
.tool-card {
  position: relative; display: flex; flex-direction: column; gap: 10px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 10px 12px; box-shadow: var(--shadow);
  text-decoration: none !important; color: var(--text) !important;
  transition: transform .22s var(--ease), box-shadow .22s var(--ease), border-color .22s;
  animation: rise .4s var(--ease) both;
}
.tool-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); border-color: var(--brand); }
.tool-card { gap: 8px; }
.tool-card .t-icon {
  width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center;
  font-size: 1.15rem; background: var(--brand-soft);
  transition: transform .25s var(--ease);
}
.tool-card:hover .t-icon { transform: scale(1.12) rotate(-4deg); }
.tool-card h3 { margin: 0; font-size: .92rem; }
.tool-card p { margin: 0; color: var(--text-2); font-size: .79rem; line-height: 1.5; flex: 1; }
.tool-card .t-go { font-size: .8rem; font-weight: 700; color: var(--brand); display: flex; align-items: center; gap: 5px; }
.tool-card .t-go::after { content: "→"; transition: transform .2s var(--ease); }
.tool-card:hover .t-go::after { transform: translateX(4px); }
.tool-card.hidden { display: none; }

/* ---------- Tool page ---------- */
.tool-head { margin-bottom: 22px; display: flex; align-items: center; flex-wrap: wrap; gap: 14px; }
.tool-head .t-icon-lg {
  width: 56px; height: 56px; border-radius: 15px; display: grid; place-items: center;
  font-size: 1.7rem; background: var(--brand-soft); flex: none;
}
.tool-head h1 { margin: 0; }
.tool-head p.lead { color: var(--text-2); font-size: 1.02rem; max-width: 760px; margin: 0; flex-basis: 100%; }

.tool-panel {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; box-shadow: var(--shadow); margin-bottom: 24px;
  animation: rise .4s var(--ease) both;
}

/* Form elements */
.field { margin-bottom: 16px; }
.field label { display: block; font-weight: 600; font-size: .86rem; margin-bottom: 7px; }
.field .hint { font-size: .78rem; color: var(--text-3); margin-top: 5px; }
input[type="text"], input[type="url"], input[type="number"], input[type="date"], select, textarea {
  width: 100%; padding: 11px 14px; font-family: inherit; font-size: .92rem;
  border: 1.5px solid var(--border); border-radius: 10px;
  background: var(--surface-2); color: var(--text); outline: none;
  transition: border-color .2s, box-shadow .2s;
}
input:focus, select:focus, textarea:focus { border-color: var(--brand); box-shadow: 0 0 0 4px var(--brand-soft); background: var(--surface); }
textarea { min-height: 130px; resize: vertical; line-height: 1.6; }
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.row-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 14px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 24px; border-radius: 10px; border: 0; cursor: pointer;
  font-family: inherit; font-weight: 700; font-size: .92rem;
  background: var(--brand); color: #fff;
  transition: all .2s var(--ease);
}
.btn:hover { background: var(--brand-600); transform: translateY(-1px); box-shadow: 0 6px 18px var(--brand-soft); }
.btn:active { transform: translateY(0); }
.btn.secondary { background: var(--surface-2); color: var(--text); border: 1.5px solid var(--border); }
.btn.secondary:hover { border-color: var(--brand); color: var(--brand); background: var(--surface-2); }
.btn.sm { padding: 8px 14px; font-size: .8rem; }
.btn[disabled] { opacity: .55; cursor: not-allowed; transform: none; }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }

/* Results */
.result-area { margin-top: 22px; }
.result-area:empty { margin: 0; }
.notice { padding: 13px 16px; border-radius: 10px; font-size: .88rem; margin: 14px 0; border: 1px solid; }
.notice.info { background: var(--brand-soft); border-color: var(--brand); color: var(--text); }
.notice.ok { background: rgba(22,163,74,.08); border-color: var(--ok); }
.notice.warn { background: rgba(217,119,6,.08); border-color: var(--warn); }
.notice.bad { background: rgba(220,38,38,.08); border-color: var(--bad); }

.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 12px; margin: 16px 0; }
.stat {
  background: var(--surface-2); border-radius: var(--radius-sm); padding: 14px; text-align: center;
  animation: pop .3s var(--ease) both;
}
.stat b { display: block; font-size: 1.4rem; color: var(--brand); }
.stat span { font-size: .74rem; color: var(--text-3); text-transform: uppercase; letter-spacing: .05em; }
.stat.s-ok b { color: var(--ok); } .stat.s-warn b { color: var(--warn); } .stat.s-bad b { color: var(--bad); }

table.data { width: 100%; border-collapse: collapse; font-size: .86rem; margin: 14px 0; }
table.data th, table.data td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--border); }
table.data th { font-size: .72rem; text-transform: uppercase; letter-spacing: .06em; color: var(--text-3); }
table.data tr:hover td { background: var(--brand-soft); }
.table-wrap { overflow-x: auto; }

.badge { display: inline-block; padding: 3px 10px; border-radius: 999px; font-size: .72rem; font-weight: 700; }
.badge.ok { background: rgba(22,163,74,.12); color: var(--ok); }
.badge.warn { background: rgba(217,119,6,.12); color: var(--warn); }
.badge.bad { background: rgba(220,38,38,.12); color: var(--bad); }
.badge.info { background: var(--brand-soft); color: var(--brand); }

.meter { height: 10px; border-radius: 999px; background: var(--surface-2); overflow: hidden; margin: 6px 0; }
.meter > i { display: block; height: 100%; border-radius: 999px; background: linear-gradient(90deg, var(--brand), var(--accent)); transition: width .6s var(--ease); }
.meter.m-ok > i { background: var(--ok); } .meter.m-warn > i { background: var(--warn); } .meter.m-bad > i { background: var(--bad); }

pre.codebox {
  background: #0f172a; color: #e2e8f0; border-radius: var(--radius-sm);
  padding: 18px; overflow-x: auto; font-size: .82rem; line-height: 1.6;
  font-family: 'SF Mono', Menlo, Consolas, monospace; white-space: pre-wrap; word-break: break-all;
}
[data-theme="dark"] pre.codebox { background: #050a14; border: 1px solid var(--border); }

.spinner {
  width: 26px; height: 26px; border-radius: 50%; margin: 10px auto;
  border: 3px solid var(--brand-soft); border-top-color: var(--brand);
  animation: spin .7s linear infinite;
}
.loading-msg { text-align: center; color: var(--text-3); font-size: .86rem; padding: 18px; }

/* SERP previews */
.serp-box { background: #fff; border: 1px solid #dadce0; border-radius: 12px; padding: 18px 20px; font-family: Arial, sans-serif; margin: 12px 0; }
[data-theme="dark"] .serp-box { background: #1f2937; border-color: #374151; }
.serp-box .s-url { color: #202124; font-size: 12px; display: flex; align-items: center; gap: 6px; }
.serp-box .s-title { color: #1a0dab; font-size: 20px; margin: 4px 0 2px; line-height: 1.3; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.serp-box .s-desc { color: #4d5156; font-size: 14px; line-height: 1.58; }
[data-theme="dark"] .serp-box .s-url { color: #dadce0; }
[data-theme="dark"] .serp-box .s-title { color: #8ab4f8; }
[data-theme="dark"] .serp-box .s-desc { color: #bdc1c6; }
.serp-box.mobile { max-width: 400px; }
.serp-box.mobile .s-title { font-size: 16px; white-space: normal; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }

/* SEO copy sections on tool pages */
.tool-seo { margin-top: 8px; }
.tool-seo h2 { margin-top: 30px; }
.tool-seo ol.steps { counter-reset: st; list-style: none; padding: 0; }
.tool-seo ol.steps li {
  counter-increment: st; position: relative; padding: 0 0 14px 46px; color: var(--text-2);
}
.tool-seo ol.steps li::before {
  content: counter(st); position: absolute; left: 0; top: 0;
  width: 30px; height: 30px; border-radius: 50%; display: grid; place-items: center;
  background: var(--brand-soft); color: var(--brand); font-weight: 700; font-size: .85rem;
}
details.faq {
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 0; margin-bottom: 10px; background: var(--surface); overflow: hidden;
}
details.faq summary {
  cursor: pointer; font-weight: 600; font-size: .92rem; padding: 14px 18px; list-style: none;
  display: flex; justify-content: space-between; align-items: center; gap: 10px;
}
details.faq summary::after { content: "+"; color: var(--brand); font-size: 1.2rem; transition: transform .2s; }
details.faq[open] summary::after { transform: rotate(45deg); }
details.faq p { margin: 0; padding: 0 18px 15px; color: var(--text-2); font-size: .88rem; }

.related-tools { margin-top: 34px; }

/* ---------- Footer (compact, light green) ---------- */
.site-footer { border-top: 1px solid #bfe6cd; background: #ddf3e5; margin-top: 20px; }
[data-theme="dark"] .site-footer { background: #0f2b1c; border-top-color: #1c4a31; }
.footer-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 14px 20px;
  display: flex; align-items: center; justify-content: space-between; gap: 18px; flex-wrap: wrap;
}
.footer-inner .logo { font-size: 1.05rem; }
.footer-inner .logo .logo-badge { width: 28px; height: 28px; font-size: .85rem; }
.footer-links { display: flex; gap: 4px 18px; flex-wrap: wrap; align-items: center; }
.footer-links a { color: var(--text-2); font-size: .85rem; font-weight: 600; }
.footer-links a:hover { color: var(--brand); }
[data-theme="dark"] .footer-links a { color: #a7d8bc; }
.footer-copy { color: var(--text-3); font-size: .78rem; }
[data-theme="dark"] .footer-copy { color: #6fa88a; }

/* ---------- Animations ---------- */
@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
@keyframes pop { from { opacity: 0; transform: scale(.96); } to { opacity: 1; transform: none; } }
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .page { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed; top: var(--header-h); right: 0; bottom: 0; z-index: 90;
    width: min(320px, 88vw); max-height: none;
    background: var(--surface); border-left: 1px solid var(--border);
    padding: 20px; transform: translateX(100%); opacity: 1;
    transition: transform .3s var(--ease); box-shadow: var(--shadow-lg);
  }
  .page.sidebar-open .sidebar { transform: translateX(0); pointer-events: auto; opacity: 1; }
  .page.sidebar-collapsed .sidebar { opacity: 1; }
  .sidebar-backdrop {
    display: none; position: fixed; inset: var(--header-h) 0 0 0; z-index: 80;
    background: rgba(15, 23, 42, .45);
  }
  .page.sidebar-open ~ .sidebar-backdrop, .page.sidebar-open .sidebar-backdrop { display: block; }
  body.sidebar-open-body .sidebar-backdrop { display: block; }
  .main-nav { display: none; }
}
@media (max-width: 640px) {
  body { font-size: 15px; }
  .header-inner { gap: 10px; }
  .header-search { max-width: none; }
  .row, .row-3 { grid-template-columns: 1fr; }
  .tool-panel { padding: 18px; }
  .hero { padding: 30px 14px 26px; }
  .footer-inner { justify-content: center; text-align: center; }
  .tool-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .tool-card { padding: 16px; }
}
@media (max-width: 460px) {
  .tool-grid { grid-template-columns: 1fr; }
}