:root {
  --bg: #f6f7fb;
  --bg-elev: #ffffff;
  --bg-soft: #eef0f6;
  --fg: #1c1f2a;
  --fg-muted: #6b7280;
  --border: #e3e6ee;
  --accent: #5b5bd6;
  --accent-soft: #eceefc;
  --accent-fg: #ffffff;
  --ok: #16a34a;
  --err: #dc2626;
  --warn: #d97706;
  --shadow: 0 1px 2px rgba(20, 24, 40, .06), 0 8px 24px -12px rgba(20, 24, 40, .18);
  --radius: 12px;
  --mono: ui-monospace, "Cascadia Code", "SF Mono", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  color-scheme: light;
}
:root[data-theme="dark"] {
  --bg: #0f1117; --bg-elev: #171a23; --bg-soft: #1f2331; --fg: #e6e8ef; --fg-muted: #9aa1b5; --border: #2a2f3f;
  --accent: #8b8bf5; --accent-soft: #24264a; --accent-fg: #0f1117; --shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 24px -12px rgba(0,0,0,.6);
  color-scheme: dark;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1117; --bg-elev: #171a23; --bg-soft: #1f2331; --fg: #e6e8ef; --fg-muted: #9aa1b5; --border: #2a2f3f;
    --accent: #8b8bf5; --accent-soft: #24264a; --accent-fg: #0f1117; --shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 24px -12px rgba(0,0,0,.6);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: var(--sans); font-size: 15px; line-height: 1.6; color: var(--fg); background: var(--bg); -webkit-font-smoothing: antialiased; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { line-height: 1.25; margin: 0 0 .5em; letter-spacing: -.01em; }
h1 { font-size: 1.9rem; } h2 { font-size: 1.4rem; } h3 { font-size: 1.1rem; }
p { margin: 0 0 .8em; }
img, canvas, video, svg { max-width: 100%; }
kbd { font: 11px var(--mono); background: var(--bg-soft); border: 1px solid var(--border); border-bottom-width: 2px; border-radius: 5px; padding: 1px 6px; color: var(--fg-muted); }
.muted { color: var(--fg-muted); } .small { font-size: .85em; } .mono { font-family: var(--mono); }
[hidden] { display: none !important; }

/* ---------- header ---------- */
.site-header { position: sticky; top: 0; z-index: 30; background: color-mix(in srgb, var(--bg-elev) 88%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border); }
.header-inner { display: flex; align-items: center; justify-content: space-between; padding: 0 20px; height: 56px; gap: 12px; }
.header-left { display: flex; align-items: center; gap: 8px; }
.logo { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 1.1rem; color: var(--fg); white-space: nowrap; }
.logo:hover { text-decoration: none; }
.logo-mark { font-size: 1.25rem; }
.header-nav { display: flex; align-items: center; gap: 6px; }
.nav-btn { background: none; border: 1px solid transparent; color: var(--fg); font: inherit; font-size: .9rem; padding: 6px 10px; border-radius: 8px; cursor: pointer; }
.nav-btn:hover { background: var(--bg-soft); }
.icon-btn { background: none; border: 1px solid transparent; color: var(--fg-muted); font: inherit; font-size: 1rem; width: 34px; height: 34px; display: inline-flex; align-items: center; justify-content: center; border-radius: 8px; cursor: pointer; line-height: 1; }
.icon-btn:hover { background: var(--bg-soft); color: var(--fg); }
.menu-btn { display: none; }
.dropdown { position: relative; }
.dropdown-menu { display: none; position: absolute; right: 0; top: calc(100% + 6px); background: var(--bg-elev); border: 1px solid var(--border); border-radius: 10px; box-shadow: var(--shadow); min-width: 160px; padding: 6px; flex-direction: column; }
.dropdown.open .dropdown-menu { display: flex; }
.dropdown-menu a { padding: 8px 12px; border-radius: 6px; color: var(--fg); font-size: .9rem; }
.dropdown-menu a:hover { background: var(--bg-soft); text-decoration: none; }

/* ---------- home ---------- */
.home main { max-width: 1180px; margin: 0 auto; padding: 0 20px 40px; }
.hero { display: grid; grid-template-columns: 1.1fr .9fr; gap: 40px; align-items: center; padding: 56px 0 40px; }
.hero h1 { font-size: clamp(1.9rem, 4vw, 3rem); margin: 14px 0 22px; }
.hero .accent { color: var(--accent); }
.hero-badge { display: inline-flex; align-items: center; gap: 6px; background: var(--accent-soft); color: var(--accent); font-size: .8rem; font-weight: 600; padding: 4px 12px; border-radius: 999px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 20px; }
.hero-points { list-style: none; padding: 0; margin: 0 0 12px; display: flex; flex-direction: column; gap: 6px; font-size: .95rem; }
.search-fake kbd { margin-left: 4px; }
.hero-art { display: flex; justify-content: center; }
.art-window { width: 100%; max-width: 420px; background: var(--bg-elev); border: 1px solid var(--border); border-radius: 14px; box-shadow: var(--shadow); overflow: hidden; }
.art-bar { display: flex; gap: 6px; padding: 10px 12px; border-bottom: 1px solid var(--border); background: var(--bg-soft); }
.art-bar i { width: 10px; height: 10px; border-radius: 50%; background: var(--border); display: block; }
.art-body { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; padding: 20px; }
.art-col { display: flex; flex-direction: column; gap: 10px; }
.art-line { height: 10px; border-radius: 5px; background: var(--bg-soft); }
.art-line.w70 { width: 70%; } .art-line.w50 { width: 50%; } .art-line.w90 { width: 90%; } .art-line.w60 { width: 60%; }
.art-box { height: 60px; border-radius: 8px; background: linear-gradient(135deg, var(--accent-soft), var(--bg-soft)); }
.art-qr { display: grid; grid-template-columns: repeat(7, 1fr); gap: 3px; width: 100px; aspect-ratio: 1; padding: 6px; background: #fff; border-radius: 6px; border: 1px solid var(--border); }
.art-qr i { display: block; background: #e5e7eb; border-radius: 1px; }
.art-qr i.on { background: #1c1f2a; }
.art-swatches { display: flex; gap: 6px; }
.art-swatches i { display: block; width: 22px; height: 22px; border-radius: 6px; }

.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin: 20px 0 50px; }
.feature { background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; }
.feature-icon { font-size: 1.8rem; margin-bottom: 8px; }
.feature p { margin: 0; color: var(--fg-muted); font-size: .92rem; }

.featured h2, .all-tools h2, .faq-section h2 { font-size: 1.5rem; }
.marquee { overflow: hidden; margin: 0 -20px 50px; padding: 4px 0; mask-image: linear-gradient(90deg, transparent, #000 6%, #000 94%, transparent); }
.marquee-track { display: flex; gap: 14px; width: max-content; animation: marquee 60s linear infinite; padding: 0 20px; }
.marquee:hover .marquee-track { animation-play-state: paused; }
@keyframes marquee { to { transform: translateX(-50%); } }

.all-tools .sub { margin-top: -6px; margin-bottom: 20px; }
.cat-block { margin-bottom: 34px; }
.cat-title { display: flex; align-items: center; gap: 6px; font-size: 1.15rem; margin-bottom: 12px; }
.cat-title .count { margin-left: 6px; font-weight: 400; }
.tool-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 14px; }
.tool-card { display: flex; flex-direction: column; gap: 6px; background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; color: var(--fg); transition: transform .15s, box-shadow .15s, border-color .15s; }
.tool-card:hover { text-decoration: none; transform: translateY(-2px); box-shadow: var(--shadow); border-color: var(--accent); }
.tool-card.compact { width: 240px; flex-shrink: 0; }
.tool-card-head { display: flex; align-items: center; gap: 8px; }
.tool-icon { display: inline-flex; align-items: center; justify-content: center; width: 30px; height: 30px; border-radius: 8px; background: var(--accent-soft); font-size: .95rem; font-family: var(--mono); flex-shrink: 0; }
.tool-icon.big { width: 42px; height: 42px; font-size: 1.3rem; margin-right: 10px; vertical-align: middle; }
.tool-name { font-weight: 600; }
.tool-desc { margin: 0; font-size: .88rem; color: var(--fg-muted); flex: 1; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag { font-size: .72rem; background: var(--bg-soft); color: var(--fg-muted); padding: 2px 8px; border-radius: 999px; }

.faq-list { display: flex; flex-direction: column; gap: 8px; max-width: 860px; }
.faq { background: var(--bg-elev); border: 1px solid var(--border); border-radius: 10px; padding: 0 16px; }
.faq summary { cursor: pointer; padding: 14px 0; font-weight: 600; list-style: none; display: flex; justify-content: space-between; }
.faq summary::after { content: '+'; color: var(--fg-muted); }
.faq[open] summary::after { content: '−'; }
.faq p { color: var(--fg-muted); padding-bottom: 14px; margin: 0; }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--border); background: var(--bg-elev); margin-top: 40px; }
.footer-inner { max-width: 1180px; margin: 0 auto; padding: 28px 20px; display: flex; flex-wrap: wrap; gap: 20px 40px; align-items: flex-start; justify-content: space-between; }
.footer-brand { font-weight: 700; }
.footer-brand p { margin: 2px 0 0; font-weight: 400; font-size: .85rem; }
.footer-links { display: flex; gap: 18px; font-size: .9rem; }
.footer-inner .copy { width: 100%; margin: 0; font-size: .8rem; }

/* ---------- tool layout: fixed header + footer, sidebar and main scroll independently ---------- */
.page.with-sidebar { height: 100vh; height: 100dvh; display: flex; flex-direction: column; overflow: hidden; }
.page.with-sidebar .site-header { position: static; flex-shrink: 0; }
.page.with-sidebar .site-footer { flex-shrink: 0; margin-top: 0; }
.page.with-sidebar .footer-inner { padding: 8px 20px; gap: 6px 24px; align-items: center; }
.page.with-sidebar .footer-brand p { display: none; }
.page.with-sidebar .footer-inner .copy { width: auto; }
.layout { display: flex; flex: 1; min-height: 0; }
.sidebar { width: 260px; flex-shrink: 0; border-right: 1px solid var(--border); background: var(--bg-elev); height: 100%; overflow-y: auto; padding: 12px; }
.tool-main { height: 100%; overflow-y: auto; scroll-behavior: smooth; }
.side-search-wrap { position: relative; margin-bottom: 8px; }
.side-search { width: 100%; padding-right: 60px; }
.side-kbd { position: absolute; right: 8px; top: 50%; transform: translateY(-50%); }
.side-cat { border-bottom: 1px solid var(--border); padding: 4px 0; }
.side-cat summary { cursor: pointer; font-weight: 600; font-size: .9rem; padding: 8px 6px; list-style: none; display: flex; justify-content: space-between; border-radius: 6px; }
.side-cat summary::after { content: '›'; color: var(--fg-muted); transition: transform .15s; }
.side-cat[open] summary::after { transform: rotate(90deg); }
.side-cat summary:hover { background: var(--bg-soft); }
.side-cat ul { list-style: none; margin: 0 0 6px; padding: 0 0 0 6px; }
.side-cat li a { display: block; padding: 6px 10px; font-size: .88rem; color: var(--fg); border-radius: 6px; }
.side-cat li a:hover { background: var(--bg-soft); text-decoration: none; }
.side-cat li a.active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.side-empty { padding: 4px 10px 8px; margin: 0; }
.side-backdrop { display: none; }
.tool-main { flex: 1; min-width: 0; padding: 28px 32px 40px; }
.tool-main > * { max-width: 1080px; margin-left: auto; margin-right: auto; }
.tool-head { margin-bottom: 20px; }
.tool-head h1 { display: flex; align-items: center; margin-bottom: 4px; }
.fav-btn { background: none; border: none; font-size: 1.4rem; color: var(--fg-muted); cursor: pointer; margin-left: 8px; line-height: 1; }
.fav-btn.on, .fav-btn:hover { color: #f5b301; }
.tool-sub { color: var(--fg-muted); margin: 0 0 10px; }
.tool-meta { display: flex; flex-wrap: wrap; gap: 10px 16px; align-items: center; justify-content: space-between; }
.tool-links { display: flex; gap: 8px; flex-wrap: wrap; }
.pill { font: inherit; font-size: .8rem; background: var(--bg-elev); border: 1px solid var(--border); color: var(--fg); padding: 4px 12px; border-radius: 999px; cursor: pointer; }
.pill:hover { border-color: var(--accent); text-decoration: none; }
.tool-mount { display: flex; flex-direction: column; gap: 16px; }
.loading { color: var(--fg-muted); padding: 30px; text-align: center; }
.static-main { max-width: 760px; margin: 0 auto; padding: 40px 20px; }

/* ---------- help article ---------- */
.help { margin-top: 40px; padding-top: 30px; border-top: 1px solid var(--border); max-width: 820px; }
.help h2 { font-size: 1.3rem; }
.help-sec { margin-top: 20px; }
.help-sec h3 { font-size: 1.05rem; }
.help ul, .help ol { padding-left: 22px; }
.help li { margin-bottom: 4px; }
.related { margin-top: 40px; padding-top: 30px; border-top: 1px solid var(--border); }
.related h2 { font-size: 1.2rem; }

/* ---------- generic components ---------- */
.btn { display: inline-flex; align-items: center; gap: 6px; font: inherit; font-size: .92rem; font-weight: 500; padding: 9px 18px; border-radius: 9px; border: 1px solid var(--border); background: var(--bg-elev); color: var(--fg); cursor: pointer; transition: background .15s, border-color .15s; }
.btn:hover { background: var(--bg-soft); text-decoration: none; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-fg); }
.btn.primary:hover { filter: brightness(1.08); }
.btn.danger { color: var(--err); }
.btn.small { padding: 5px 12px; font-size: .85rem; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.panel, .options-bar { background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px 18px; }
.options-bar { display: flex; flex-wrap: wrap; gap: 14px 28px; align-items: flex-end; }
.row { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.card { background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.card-head { display: flex; justify-content: space-between; align-items: center; padding: 10px 14px; border-bottom: 1px solid var(--border); background: var(--bg-soft); font-size: .88rem; font-weight: 600; }
.card-actions { display: flex; gap: 4px; }
.card-body { padding: 14px; }
.field { display: flex; flex-direction: column; gap: 6px; font-size: .88rem; }
.field-label { font-weight: 600; color: var(--fg-muted); font-size: .8rem; display: flex; justify-content: space-between; gap: 10px; }
.field-hint { color: var(--fg-muted); font-size: .78rem; }
.input { font: inherit; font-size: .92rem; padding: 8px 10px; border: 1px solid var(--border); border-radius: 8px; background: var(--bg); color: var(--fg); min-width: 0; }
.input:focus { outline: 2px solid var(--accent); outline-offset: -1px; border-color: var(--accent); }
.input.num { width: 110px; }
.input-unit { display: inline-flex; align-items: center; gap: 6px; }
.unit { color: var(--fg-muted); font-size: .85rem; }
.select { padding-right: 28px; }
.range { width: 220px; accent-color: var(--accent); }
.range-field .range-val { font-family: var(--mono); color: var(--fg); font-weight: 400; }
.check { display: inline-flex; align-items: center; gap: 8px; font-size: .9rem; cursor: pointer; }
.check input { accent-color: var(--accent); width: 16px; height: 16px; }
.seg-group { display: flex; flex-direction: column; gap: 6px; }
.seg-btns { display: inline-flex; background: var(--bg-soft); border: 1px solid var(--border); border-radius: 9px; padding: 3px; gap: 2px; flex-wrap: wrap; }
.seg { font: inherit; font-size: .85rem; padding: 5px 12px; border: none; border-radius: 7px; background: transparent; color: var(--fg-muted); cursor: pointer; }
.seg.active { background: var(--bg-elev); color: var(--accent); font-weight: 600; box-shadow: 0 1px 2px rgba(0,0,0,.08); }
.color-input { display: flex; gap: 8px; align-items: center; }
.color-picker { width: 38px; height: 36px; padding: 2px; border: 1px solid var(--border); border-radius: 8px; background: var(--bg); cursor: pointer; }
.color-text { width: 120px; }

.editor { background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; display: flex; flex-direction: column; }
.editor.has-error { border-color: var(--err); }
.editor-head { display: flex; justify-content: space-between; align-items: center; padding: 6px 8px 6px 14px; border-bottom: 1px solid var(--border); background: var(--bg-soft); }
.editor-label { font-size: .85rem; font-weight: 600; display: flex; align-items: center; gap: 8px; }
.badge { font-size: .7rem; font-weight: 500; background: var(--bg-elev); border: 1px solid var(--border); padding: 1px 8px; border-radius: 999px; color: var(--fg-muted); }
.editor-actions { display: flex; gap: 2px; }
.editor-ta { font: inherit; font-size: .9rem; line-height: 1.5; padding: 12px 14px; border: none; background: transparent; color: var(--fg); resize: vertical; min-height: 160px; width: 100%; outline: none; tab-size: 2; }
.editor.readonly .editor-ta { background: var(--bg); }
.editor-error { padding: 8px 14px; background: color-mix(in srgb, var(--err) 10%, transparent); color: var(--err); font-size: .85rem; font-family: var(--mono); border-top: 1px solid var(--border); }
.editor-foot { display: flex; gap: 16px; padding: 5px 14px; border-top: 1px solid var(--border); font-size: .75rem; color: var(--fg-muted); font-family: var(--mono); }

.code-wrap { background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.code-head { display: flex; justify-content: space-between; align-items: center; padding: 6px 8px 6px 14px; background: var(--bg-soft); border-bottom: 1px solid var(--border); font-size: .85rem; font-weight: 600; }
.code-block { margin: 0; padding: 14px; font-family: var(--mono); font-size: .86rem; line-height: 1.55; overflow-x: auto; background: var(--bg-elev); border-radius: 8px; white-space: pre-wrap; word-break: break-all; }
.help .code-block { border: 1px solid var(--border); }
.kv { width: 100%; border-collapse: collapse; font-size: .9rem; background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.kv th { text-align: left; font-weight: 600; color: var(--fg-muted); padding: 9px 14px; width: 30%; border-bottom: 1px solid var(--border); font-size: .85rem; vertical-align: top; }
.kv td { padding: 9px 14px; border-bottom: 1px solid var(--border); word-break: break-all; vertical-align: top; }
.kv td.kv-act { width: 44px; padding: 4px 6px; text-align: right; }
.kv tr:last-child th, .kv tr:last-child td { border-bottom: none; }
.error-box { background: color-mix(in srgb, var(--err) 10%, transparent); color: var(--err); border: 1px solid color-mix(in srgb, var(--err) 40%, transparent); padding: 10px 14px; border-radius: 10px; font-size: .9rem; white-space: pre-wrap; }
.info-box { background: var(--accent-soft); color: var(--fg); border: 1px solid var(--border); padding: 10px 14px; border-radius: 10px; font-size: .9rem; }
.empty-hint { color: var(--fg-muted); padding: 24px; text-align: center; font-size: .9rem; }

.dropzone { border: 2px dashed var(--border); border-radius: var(--radius); padding: 32px 20px; text-align: center; cursor: pointer; background: var(--bg-elev); transition: border-color .15s, background .15s; }
.dropzone:hover, .dropzone.over { border-color: var(--accent); background: var(--accent-soft); }
.drop-icon { font-size: 2rem; }
.drop-hint { color: var(--fg-muted); font-size: .9rem; margin-top: 6px; }

.toast { position: fixed; left: 50%; bottom: 28px; transform: translate(-50%, 20px); background: var(--fg); color: var(--bg); padding: 10px 18px; border-radius: 10px; font-size: .9rem; opacity: 0; pointer-events: none; transition: opacity .2s, transform .2s; z-index: 100; box-shadow: var(--shadow); }
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast.err { background: var(--err); color: #fff; }

/* preview checkerboard for images */
.checker { background-color: #fff; background-image: linear-gradient(45deg, #ddd 25%, transparent 25%), linear-gradient(-45deg, #ddd 25%, transparent 25%), linear-gradient(45deg, transparent 75%, #ddd 75%), linear-gradient(-45deg, transparent 75%, #ddd 75%); background-size: 16px 16px; background-position: 0 0, 0 8px, 8px -8px, -8px 0; }
.preview-box { border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; display: flex; align-items: center; justify-content: center; min-height: 200px; background: var(--bg-elev); overflow: hidden; }
.thumb-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 14px; }
.thumb { background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; display: flex; flex-direction: column; }
.thumb img { width: 100%; height: 140px; object-fit: contain; background: var(--bg-soft); }
.thumb .thumb-meta { padding: 8px 10px; font-size: .78rem; color: var(--fg-muted); display: flex; justify-content: space-between; align-items: center; gap: 6px; word-break: break-all; }
.swatch-row { display: flex; flex-wrap: wrap; gap: 8px; }
.swatch { display: flex; flex-direction: column; align-items: center; gap: 4px; font-family: var(--mono); font-size: .75rem; cursor: pointer; }
.swatch i { display: block; width: 56px; height: 56px; border-radius: 10px; border: 1px solid var(--border); }

/* ---------- palette ---------- */
.palette-backdrop { position: fixed; inset: 0; background: rgba(0,0,0,.4); z-index: 50; display: flex; justify-content: center; align-items: flex-start; padding: 12vh 16px 16px; }
.palette { width: 100%; max-width: 620px; background: var(--bg-elev); border: 1px solid var(--border); border-radius: 14px; box-shadow: var(--shadow); overflow: hidden; max-height: 70vh; display: flex; flex-direction: column; }
.palette-head { display: flex; align-items: center; gap: 10px; padding: 12px 14px; border-bottom: 1px solid var(--border); }
.palette-input { flex: 1; font: inherit; font-size: 1rem; border: none; background: transparent; color: var(--fg); outline: none; }
.palette-list { overflow-y: auto; padding: 6px; }
.palette-item { display: flex; align-items: center; gap: 12px; padding: 8px 10px; border-radius: 8px; color: var(--fg); }
.palette-item > span:nth-child(2) { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.palette-item small { color: var(--fg-muted); font-size: .8rem; }
.palette-item:hover, .palette-item.active { background: var(--bg-soft); text-decoration: none; }

/* ---------- responsive ---------- */
@media (max-width: 960px) {
  .hero { grid-template-columns: 1fr; gap: 24px; padding-top: 32px; }
  .hero-art { display: none; }
  .features { grid-template-columns: 1fr; }
  .menu-btn { display: inline-flex; }
  .sidebar { position: fixed; left: 0; top: 56px; height: calc(100vh - 56px); height: calc(100dvh - 56px); transform: translateX(-100%); transition: transform .2s; z-index: 40; box-shadow: var(--shadow); }
  body.sidebar-open .sidebar { transform: none; }
  body.sidebar-open .side-backdrop { display: block; position: fixed; inset: 56px 0 0 0; background: rgba(0,0,0,.35); z-index: 35; }
  .tool-main { padding: 20px 16px 30px; }
  .grid2 { grid-template-columns: 1fr; }
  .lang-btn { padding: 6px 8px; }
}
@media (max-width: 600px) {
  .header-inner { padding: 0 12px; }
  .home main { padding: 0 16px 30px; }
  .marquee { margin: 0 -16px 40px; }
  .nav-btn:not(.lang-btn) { display: none; }
  .tool-head h1 { font-size: 1.5rem; }
  .range { width: 160px; }
  .kv th { width: 36%; }
}