:root {
  --bg: #f6f5f1;
  --surface: #ffffff;
  --surface-2: #f0efe9;
  --ink: #17181c;
  --ink-2: #4a4c55;
  --muted: #74767f;
  --line: #e2e0d8;
  --accent: #2f5bff;
  --accent-ink: #ffffff;
  --accent-soft: #e8edff;
  --ok: #16a34a;
  --err: #dc2626;
  --c-image: #e2591c;
  --c-audio: #8b3dff;
  --c-video: #e0245e;
  --c-gps: #0f9d74;
  --c-3d: #2f5bff;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(20, 20, 30, .04), 0 8px 24px -12px rgba(20, 20, 30, .12);
  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14151a; --surface: #1c1d24; --surface-2: #23252d; --ink: #f1f1f3; --ink-2: #c4c5cc; --muted: #8d8f99;
    --line: #2e3039; --accent: #6d8cff; --accent-ink: #0d0f1a; --accent-soft: #232a45;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 10px 30px -14px rgba(0, 0, 0, .6);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.6 var(--font); }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { line-height: 1.2; letter-spacing: -.015em; }
img, svg { vertical-align: middle; }
[hidden] { display: none !important; }
.wrap { width: 100%; max-width: 980px; margin: 0 auto; padding: 0 16px; }
.muted { color: var(--muted); }
.row { display: flex; align-items: center; }
.gap { gap: 8px; }

/* ---------- header ---------- */
.top { position: sticky; top: 0; z-index: 20; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: saturate(1.4) blur(10px); border-bottom: 1px solid var(--line); }
.top-in { display: flex; align-items: center; justify-content: space-between; height: 58px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 750; font-size: 18px; color: var(--ink); letter-spacing: -.02em; }
.logo:hover { text-decoration: none; }
.logo-mark { width: 26px; height: 26px; border-radius: 8px; background: linear-gradient(135deg, var(--c-image), var(--c-audio) 50%, var(--c-3d)); box-shadow: inset 0 0 0 5px color-mix(in srgb, #fff 22%, transparent); }
.top-nav { display: flex; align-items: center; gap: 18px; font-size: 15px; }
.top-nav > a { color: var(--ink-2); }
.lang { position: relative; }
.lang-btn { display: inline-flex; align-items: center; gap: 6px; font: 600 13px var(--font); color: var(--ink); background: var(--surface); border: 1px solid var(--line); border-radius: 999px; padding: 6px 12px; cursor: pointer; }
.lang-menu { position: absolute; right: 0; top: calc(100% + 8px); list-style: none; margin: 0; padding: 6px; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow); min-width: 160px; }
.lang-menu a { display: block; padding: 8px 12px; border-radius: 8px; color: var(--ink); }
.lang-menu a:hover, .lang-menu a[aria-current] { background: var(--surface-2); text-decoration: none; }

/* ---------- hero ---------- */
.crumbs { display: flex; gap: 8px; font-size: 14px; color: var(--muted); padding-top: 20px; flex-wrap: wrap; }
.crumbs a { color: var(--muted); }
.hero { padding: 18px 0 10px; }
.hero h1 { font-size: clamp(30px, 5vw, 44px); margin: 0 0 10px; font-weight: 800; }
.hero .lead { font-size: 18px; color: var(--ink-2); max-width: 680px; margin: 0 0 14px; }
.badge { display: inline-flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 600; color: var(--ok); background: color-mix(in srgb, var(--ok) 10%, transparent); padding: 6px 12px; border-radius: 999px; margin: 0; }
.hero-home { padding: 44px 0 20px; text-align: center; }
.hero-home .lead { margin: 0 auto 18px; }
.pills { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.pills li { font-size: 14px; font-weight: 600; padding: 6px 12px; border-radius: 999px; background: var(--surface); border: 1px solid var(--line); color: var(--ink-2); }

/* ---------- tool card ---------- */
.tool-card { background: var(--surface); border: 1px solid var(--line); border-radius: calc(var(--radius) + 4px); padding: 18px; box-shadow: var(--shadow); margin: 18px 0 8px; }
#app { display: flex; flex-direction: column; gap: 16px; }
.drop { position: relative; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px; text-align: center; min-height: 230px; padding: 28px 16px; border: 2px dashed color-mix(in srgb, var(--accent) 35%, var(--line)); border-radius: var(--radius); background: color-mix(in srgb, var(--accent-soft) 45%, var(--surface)); cursor: pointer; transition: background .15s, border-color .15s, transform .15s; outline: none; }
.drop:hover, .drop:focus-visible, .drop.over { border-color: var(--accent); background: var(--accent-soft); }
.drop.over { transform: scale(1.005); }
.drop strong { font-size: 20px; }
.drop-icon { color: var(--accent); }
.drop .btn { margin-top: 8px; }
.drop-static { cursor: default; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; font: 650 15px var(--font); border-radius: 10px; padding: 10px 18px; border: 1px solid transparent; cursor: pointer; transition: filter .12s, background .12s, opacity .12s; white-space: nowrap; }
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover:not(:disabled) { filter: brightness(1.08); }
.btn-ghost { background: var(--surface-2); color: var(--ink); border-color: var(--line); }
.btn-ghost:hover:not(:disabled) { background: var(--line); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn-lg { padding: 13px 26px; font-size: 16px; }
.btn-sm { padding: 7px 12px; font-size: 14px; }
.icon-btn { width: 30px; height: 30px; border-radius: 8px; border: 0; background: transparent; color: var(--muted); font-size: 20px; line-height: 1; cursor: pointer; }
.icon-btn:hover { background: var(--surface-2); color: var(--ink); }
.actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }

.opts { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 12px 16px; padding: 14px; background: var(--surface-2); border-radius: var(--radius); }
.opt { display: flex; flex-direction: column; gap: 6px; font-size: 14px; font-weight: 600; color: var(--ink-2); }
.opt .row { gap: 10px; }
.opt output { min-width: 32px; font-variant-numeric: tabular-nums; color: var(--ink); }
.opt input[type=range] { flex: 1; accent-color: var(--accent); }
.opt select, .opt input[type=text], .opt input[type=number] { font: 500 15px var(--font); color: var(--ink); background: var(--surface); border: 1px solid var(--line); border-radius: 9px; padding: 9px 10px; width: 100%; }
.opt-check { flex-direction: row; align-items: center; gap: 10px; cursor: pointer; display: flex; font-size: 14px; font-weight: 600; color: var(--ink-2); }
.opt-check input { width: 18px; height: 18px; accent-color: var(--accent); }
.opt-check input[type=color] { width: 34px; height: 28px; padding: 0; border: 1px solid var(--line); border-radius: 6px; background: none; }

.preview { display: flex; flex-direction: column; gap: 10px; }
.preview video { width: 100%; max-height: 380px; background: #000; border-radius: var(--radius); }
.preview audio { width: 100%; }

.stage { margin: 0; min-height: 1.6em; font-size: 14px; }
.queue { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.item { display: flex; align-items: center; gap: 14px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
.item-main { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 6px; }
.item .name { font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.bar { height: 5px; border-radius: 999px; background: var(--surface-2); overflow: hidden; }
.bar i { display: block; height: 100%; width: 0; background: var(--accent); border-radius: inherit; transition: width .2s; }
.item.done .bar i { background: var(--ok); }
.item.error .bar i { background: var(--err); }
.item-side { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.size { font-size: 13px; color: var(--muted); font-variant-numeric: tabular-nums; }
.err { font-size: 13px; color: var(--err); max-width: 260px; }
.note { font-size: 13px; margin: 0; }

.viewer { width: 100%; height: min(60vh, 460px); border-radius: var(--radius); overflow: hidden; background: radial-gradient(circle at 50% 40%, var(--surface), var(--surface-2)); border: 1px solid var(--line); touch-action: none; }
.viewer canvas { display: block; }
.viewer-controls { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 10px; margin: 0; }
.stats dt { font-size: 13px; color: var(--muted); }
.stats dd { margin: 2px 0 0; font-weight: 700; font-variant-numeric: tabular-nums; }
.stats dt, .stats dd { padding: 0 2px; }
.stats { grid-auto-flow: row; }

/* ---------- content ---------- */
.content { padding: 12px 0 30px; max-width: 760px; }
.content h2 { font-size: 24px; margin: 34px 0 12px; }
.content p { color: var(--ink-2); }
.steps { padding: 0; margin: 0; list-style: none; counter-reset: s; display: flex; flex-direction: column; gap: 10px; }
.steps li { counter-increment: s; display: flex; gap: 12px; align-items: baseline; color: var(--ink-2); }
.steps li::before { content: counter(s); flex: 0 0 28px; height: 28px; display: inline-grid; place-items: center; border-radius: 50%; background: var(--accent-soft); color: var(--accent); font-weight: 800; font-size: 14px; }
details { border-bottom: 1px solid var(--line); padding: 14px 0; }
details summary { cursor: pointer; font-weight: 650; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
details summary::-webkit-details-marker { display: none; }
details summary::after { content: '+'; color: var(--muted); font-size: 20px; line-height: 1; }
details[open] summary::after { content: '–'; }
details p { margin: 10px 0 0; }
.prose { padding-top: 30px; }
.prose h1 { font-size: 34px; }
.prose h2 { font-size: 20px; }

.cards { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 10px; }
.card { display: flex; gap: 14px; align-items: flex-start; height: 100%; padding: 14px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); color: var(--ink); transition: border-color .15s, transform .15s, box-shadow .15s; }
.card:hover { text-decoration: none; border-color: color-mix(in srgb, var(--accent) 45%, var(--line)); box-shadow: var(--shadow); transform: translateY(-1px); }
.card strong { display: block; font-size: 15px; }
.card small { display: block; color: var(--muted); font-size: 13px; line-height: 1.45; margin-top: 3px; }
.card-ic { flex: 0 0 38px; height: 38px; border-radius: 10px; display: grid; place-items: center; }
.cat-image .card-ic, .card-ic.cat-image { color: var(--c-image); background: color-mix(in srgb, var(--c-image) 12%, transparent); }
.card-ic.cat-audio { color: var(--c-audio); background: color-mix(in srgb, var(--c-audio) 12%, transparent); }
.card-ic.cat-video { color: var(--c-video); background: color-mix(in srgb, var(--c-video) 12%, transparent); }
.card-ic.cat-gps { color: var(--c-gps); background: color-mix(in srgb, var(--c-gps) 12%, transparent); }
.card-ic.cat-3d { color: var(--c-3d); background: color-mix(in srgb, var(--c-3d) 12%, transparent); }
.cat-block { margin: 28px 0; }
.cat-block h2 { display: flex; align-items: center; gap: 10px; font-size: 22px; margin: 0 0 14px; }

/* ---------- ads ---------- */
.ad { margin: 18px 0; min-height: 90px; display: flex; justify-content: center; }
.ad-preview { align-items: center; border: 1px dashed var(--line); border-radius: 12px; color: var(--muted); font-size: 13px; background: repeating-linear-gradient(45deg, transparent 0 10px, var(--surface-2) 10px 20px); }

/* ---------- footer ---------- */
.foot { border-top: 1px solid var(--line); margin-top: 30px; padding: 34px 0 26px; background: var(--surface); }
.foot-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 22px; }
.foot h3 { font-size: 14px; display: flex; gap: 6px; align-items: center; margin: 0 0 10px; }
.foot ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 6px; }
.foot ul a { color: var(--ink-2); font-size: 14px; }
.foot-bottom { margin-top: 28px; padding-top: 18px; border-top: 1px solid var(--line); font-size: 13px; color: var(--muted); }
.foot-bottom p { margin: 4px 0; }
.foot-bottom a { color: var(--muted); }

@media (max-width: 560px) {
  .tool-card { padding: 12px; }
  .drop { min-height: 190px; }
  .item { flex-wrap: wrap; }
  .item-side { width: 100%; justify-content: space-between; }
  .top-nav > a { display: none; }
  .hero .lead { font-size: 16px; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }

.result { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; padding: 14px 16px; border-radius: 12px; background: color-mix(in srgb, var(--ok) 10%, var(--surface)); border: 1px solid color-mix(in srgb, var(--ok) 35%, var(--line)); }
.result .name { flex: 1; min-width: 0; font-weight: 700; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.cat-block h2 .ic, .foot h3 .ic { color: var(--accent); }