:root {
  color-scheme: dark;
  --bg: #080b12;
  --panel: rgba(18, 24, 38, .86);
  --panel-2: rgba(27, 35, 53, .72);
  --text: #f7f8fb;
  --muted: #aeb7c8;
  --line: rgba(255,255,255,.11);
  --accent: #8b7cff;
  --accent-2: #5fe0bd;
  --danger: #ff7a8b;
  --shadow: 0 24px 70px rgba(0,0,0,.34);
}
* { box-sizing: border-box; }
html { min-height: 100%; background: var(--bg); }
body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 20% 0%, rgba(139,124,255,.18), transparent 35rem),
    radial-gradient(circle at 90% 18%, rgba(95,224,189,.10), transparent 30rem),
    var(--bg);
}
button, input { font: inherit; }
button { cursor: pointer; }
input:disabled { cursor: wait; opacity: .72; }
code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .92em; }
.skip-link {
  position: fixed;
  left: 16px;
  top: -60px;
  z-index: 100;
  padding: 10px 14px;
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
}
.skip-link:focus { top: 12px; }
.shell { width: min(920px, calc(100% - 32px)); margin: 0 auto; padding: 54px 0 72px; }
.hero { padding: 10px 2px 30px; }
.tool-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 42px;
}
.back { color: var(--muted); text-decoration: none; display: inline-block; }
.back:hover { color: var(--text); }
.language-toggle {
  min-width: 44px;
  height: 38px;
  padding: 0 11px;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--text);
  background: var(--panel-2);
  font-weight: 800;
  letter-spacing: .02em;
}
.language-toggle:hover { border-color: rgba(139,124,255,.7); }
.language-toggle:focus-visible,
.back:focus-visible,
.primary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}
.eyebrow { margin: 0 0 10px; color: var(--accent-2); font-size: 12px; font-weight: 800; letter-spacing: .16em; }
h1 { margin: 0; font-size: clamp(48px, 9vw, 84px); line-height: .95; letter-spacing: -.055em; }
.lead { max-width: 720px; margin: 22px 0 0; color: var(--muted); font-size: clamp(17px, 2.3vw, 21px); line-height: 1.55; }
.panel { margin-top: 20px; padding: clamp(20px, 4vw, 34px); border: 1px solid var(--line); border-radius: 24px; background: var(--panel); box-shadow: var(--shadow); backdrop-filter: blur(18px); }
.panel h2 { margin: 0 0 18px; font-size: 22px; }
.input-row { display: grid; grid-template-columns: 1fr auto; gap: 10px; }
input[type="url"] { width: 100%; min-width: 0; padding: 15px 17px; color: var(--text); background: rgba(4,7,12,.66); border: 1px solid var(--line); border-radius: 14px; outline: none; }
input[type="url"]:focus { border-color: rgba(139,124,255,.8); box-shadow: 0 0 0 3px rgba(139,124,255,.14); }
.primary { border: 0; border-radius: 14px; padding: 14px 21px; color: #090b12; background: linear-gradient(135deg, #a99cff, #6ce2c3); font-weight: 800; }
.primary:hover { filter: brightness(1.05); }
.primary:disabled { cursor: wait; opacity: .55; }
.hint, .muted { color: var(--muted); line-height: 1.5; }
.hint { margin: 13px 0 0; font-size: 13px; }
.status { margin-top: 18px; padding: 13px 15px; border: 1px solid var(--line); border-radius: 13px; color: var(--muted); background: rgba(255,255,255,.035); }
.status.error { border-color: rgba(255,122,139,.35); color: #ffc0c8; background: rgba(255,122,139,.07); }
.track-main { display: grid; grid-template-columns: 180px 1fr; gap: 25px; align-items: center; }
.cover { width: 180px; height: 180px; object-fit: cover; border-radius: 18px; border: 1px solid var(--line); background: var(--panel-2); }
.track-copy h2 { margin: 0 0 10px; font-size: clamp(27px, 5vw, 42px); letter-spacing: -.025em; }
.track-copy p { margin-top: 8px; }
.tags { color: #d8dcff; line-height: 1.55; }
.format-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 28px; }
.format-option { position: relative; display: block; }
.format-option input { position: absolute; opacity: 0; pointer-events: none; }
.format-option span { display: block; height: 100%; padding: 16px; border: 1px solid var(--line); border-radius: 15px; background: rgba(255,255,255,.025); transition: .16s ease; }
.format-option strong, .format-option small { display: block; }
.format-option strong { font-size: 17px; }
.format-option small { margin-top: 6px; color: var(--muted); line-height: 1.35; }
.format-option input:checked + span { border-color: rgba(139,124,255,.75); background: rgba(139,124,255,.12); box-shadow: inset 0 0 0 1px rgba(139,124,255,.18); }
.format-option:focus-within span { outline: 2px solid var(--accent); outline-offset: 2px; }
.download { width: 100%; margin-top: 14px; padding: 16px 20px; font-size: 16px; }
.progress-wrap { margin-top: 16px; }
.progress-line { display: flex; justify-content: space-between; gap: 16px; margin-bottom: 8px; color: var(--muted); font-size: 13px; }
progress { width: 100%; height: 8px; accent-color: var(--accent); }
.guide { margin-top: 42px; }
.section-heading { max-width: 690px; }
.section-heading h2 { margin: 0; font-size: clamp(27px, 4.5vw, 38px); letter-spacing: -.025em; }
.section-heading > p:not(.eyebrow) { margin: 12px 0 0; color: var(--muted); line-height: 1.65; }
.steps { list-style: none; display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; padding: 0; margin: 20px 0 0; }
.steps li { display: grid; grid-template-columns: auto 1fr; gap: 13px; align-items: start; padding: 20px; border: 1px solid var(--line); border-radius: 18px; background: rgba(18,24,38,.55); }
.step-number { display: grid; place-items: center; width: 30px; height: 30px; border: 1px solid rgba(139,124,255,.4); border-radius: 9px; color: #dcd7ff; background: rgba(139,124,255,.12); font-size: 13px; font-weight: 800; }
.steps h3 { margin: 3px 0 0; font-size: 15px; }
.steps p { margin: 8px 0 0; color: var(--muted); font-size: 13px; line-height: 1.55; }
.notes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 20px; }
.notes article { padding: 20px; border: 1px solid var(--line); border-radius: 18px; background: rgba(18,24,38,.55); }
.notes h2 { margin: 0; font-size: 15px; }
.notes p { margin: 9px 0 0; color: var(--muted); font-size: 13px; line-height: 1.5; }
.faq-section { margin-top: 42px; }
.faq-list { margin-top: 18px; border-top: 1px solid var(--line); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { position: relative; padding: 18px 42px 18px 0; font-weight: 750; cursor: pointer; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; position: absolute; right: 4px; top: 50%; transform: translateY(-50%); color: var(--accent-2); font-size: 22px; font-weight: 400; }
.faq-list details[open] summary::after { content: "−"; }
.faq-list summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; border-radius: 6px; }
.faq-list p { max-width: 760px; margin: -2px 42px 18px 0; color: var(--muted); line-height: 1.65; }
.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; }
@media (max-width: 700px) {
  .shell { width: min(100% - 22px, 920px); padding-top: 30px; }
  .tool-nav { margin-bottom: 30px; }
  .input-row { grid-template-columns: 1fr; }
  .track-main { grid-template-columns: 92px 1fr; gap: 16px; }
  .cover { width: 92px; height: 92px; border-radius: 13px; }
  .format-grid, .steps, .notes { grid-template-columns: 1fr; }
  .guide, .faq-section { margin-top: 34px; }
}