:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --surface-alt: #f8fafc;
  --ink: #172033;
  --muted: #667085;
  --line: #e4e9f1;
  --accent: #315bea;
  --accent-dark: #2447c5;
  --accent-soft: #edf1ff;
  --success: #087443;
  --success-bg: #e8f7ef;
  --danger: #b42318;
  --danger-bg: #fff0ee;
  --shadow: 0 16px 40px rgba(26, 42, 75, .08);
  --radius: 16px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101521;
    --surface: #171e2e;
    --surface-alt: #1d2638;
    --ink: #f1f4fa;
    --muted: #a7b0c2;
    --line: #2b3549;
    --accent: #89a1ff;
    --accent-dark: #a7b8ff;
    --accent-soft: #202b52;
    --success: #7ee2ae;
    --success-bg: #123b2b;
    --danger: #ff9a90;
    --danger-bg: #452321;
    --shadow: 0 18px 42px rgba(0, 0, 0, .22);
  }
}

* { box-sizing: border-box; }

body {
  min-width: 320px;
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% 0%, rgba(49, 91, 234, .10), transparent 30rem),
    var(--bg);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

.hero {
  position: relative;
  min-height: 286px;
  overflow: visible;
  padding: 72px 24px 84px;
  color: #fff;
  background: linear-gradient(120deg, #172b72 0%, #315bea 58%, #667ff2 100%);
}

.language-switcher { position: absolute; z-index: 2; top: 20px; right: max(24px, calc((100% - 940px) / 2)); }
.language-switcher select,
.language-switcher select:focus {
  width: 168px;
  margin: 0;
  padding: 9px 31px 9px 12px;
  border: 1px solid rgba(255,255,255,.42);
  border-radius: 9px;
  outline: 0;
  color: #fff;
  background-color: rgba(15, 29, 83, .36);
  box-shadow: 0 5px 16px rgba(8, 20, 67, .16);
  font-size: .78rem;
  font-weight: 650;
  appearance: auto;
}
.language-switcher select:hover { border-color: rgba(255,255,255,.75); background-color: rgba(15, 29, 83, .52); }
.language-switcher select option { color: #172033; background: #fff; }
.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; }
.hero-inner, main { width: min(940px, calc(100% - 40px)); margin: 0 auto; }
.hero-inner { padding-right: 180px; }
.hero-inner { text-align: left; }
.eyebrow { margin-bottom: 14px; color: #cbd6ff; font-size: .72rem; font-weight: 750; letter-spacing: .16em; }
.hero h1 { margin: 0; font-size: clamp(2.2rem, 6vw, 4.2rem); letter-spacing: -.055em; line-height: 1.05; }
.hero h1 span { color: #b9c6ff; }
.hero p { max-width: 560px; margin: 18px 0 0; color: #e3e8ff; font-size: 1.05rem; }

main { display: grid; gap: 20px; margin-top: 24px; padding-bottom: 24px; }
.card { padding: 28px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow); }
.section-heading { display: flex; gap: 14px; align-items: flex-start; margin-bottom: 24px; }
.step { display: grid; width: 36px; height: 36px; flex: 0 0 36px; place-items: center; border-radius: 10px; color: var(--accent); background: var(--accent-soft); font-size: .78rem; font-weight: 800; }
h2 { margin: 0; font-size: 1.22rem; letter-spacing: -.02em; }
.section-heading p { margin: 3px 0 0; color: var(--muted); font-size: .88rem; }

label { display: block; margin: 17px 0; color: var(--ink); font-size: .86rem; font-weight: 700; }
input, select, textarea {
  display: block;
  width: 100%;
  margin-top: 7px;
  padding: 11px 13px;
  border: 1px solid var(--line);
  border-radius: 10px;
  outline: 0;
  color: var(--ink);
  background: var(--surface-alt);
  font: inherit;
  transition: border-color .18s ease, box-shadow .18s ease, background .18s ease;
}
input:focus, select:focus, textarea:focus { border-color: var(--accent); box-shadow: 0 0 0 4px rgba(49, 91, 234, .13); background: var(--surface); }
textarea { min-height: 112px; resize: vertical; font-family: "SFMono-Regular", Consolas, monospace; font-size: .86rem; }
input[type="file"] {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  clip-path: inset(50%);
}
.file-picker { margin: 4px 0 17px; }
.file-picker-label {
  display: flex;
  align-items: center;
  gap: 13px;
  margin: 0;
  padding: 17px;
  border: 1px dashed #aebbe2;
  border-radius: 12px;
  color: var(--ink);
  background: var(--surface-alt);
  cursor: pointer;
  transition: border-color .18s ease, background .18s ease, transform .18s ease;
}
.file-picker-label:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  transform: translateY(-1px);
}
#fileIn:focus-visible + .file-picker-label {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(49, 91, 234, .13);
}
.file-icon {
  display: grid;
  width: 38px;
  height: 38px;
  flex: 0 0 38px;
  place-items: center;
  border-radius: 10px;
  color: var(--accent);
  background: var(--accent-soft);
  font-size: 1.35rem;
  font-weight: 500;
  line-height: 1;
}
.file-picker-copy { display: grid; gap: 2px; min-width: 0; }
.file-picker-copy strong { font-size: .88rem; }
.file-picker-copy small { color: var(--muted); font-size: .76rem; font-weight: 500; }
.file-picker-action {
  margin-left: auto;
  padding: 7px 11px;
  border: 1px solid var(--line);
  border-radius: 7px;
  color: var(--accent);
  background: var(--surface);
  font-size: .76rem;
  font-weight: 750;
}
.file-name {
  overflow: hidden;
  margin: 8px 3px 0;
  color: var(--muted);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: .76rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}
button {
  margin: 3px 8px 3px 0;
  padding: 10px 16px;
  border: 1px solid transparent;
  border-radius: 9px;
  color: #fff;
  background: var(--accent);
  box-shadow: 0 4px 10px rgba(49, 91, 234, .18);
  cursor: pointer;
  font: inherit;
  font-size: .88rem;
  font-weight: 700;
  transition: transform .18s ease, background .18s ease, box-shadow .18s ease;
}
button:hover { background: var(--accent-dark); box-shadow: 0 7px 16px rgba(49, 91, 234, .24); transform: translateY(-1px); }
button:active { transform: translateY(0); }
.hint { color: var(--muted); font-size: .82rem; }
.toast {
  position: fixed;
  z-index: 20;
  right: 24px;
  bottom: 24px;
  max-width: min(420px, calc(100% - 32px));
  padding: 13px 17px;
  border: 1px solid transparent;
  border-radius: 12px;
  box-shadow: 0 14px 34px rgba(24, 39, 75, .18);
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity .22s ease, transform .22s ease;
  font-size: .88rem;
  font-weight: 650;
}
.toast.visible { opacity: 1; transform: translateY(0); }
.toast.ok { color: var(--success); background: var(--success-bg); border-color: color-mix(in srgb, var(--success) 20%, transparent); }
.toast.err { color: var(--danger); background: var(--danger-bg); border-color: color-mix(in srgb, var(--danger) 20%, transparent); }
pre { overflow: auto; margin: 16px 0 0; padding: 14px; border: 1px solid var(--line); border-radius: 10px; white-space: pre-wrap; word-break: break-word; color: var(--muted); background: var(--surface-alt); font-size: .82rem; }
.blk { margin: 18px 0 0; padding-top: 15px; border-top: 1px solid var(--line); }
.grid { margin: 10px 0; border-collapse: separate; border-spacing: 3px; }
.grid th, .grid td { width: 38px; height: 32px; border-radius: 5px; text-align: center; font-family: "SFMono-Regular", Consolas, monospace; font-size: .78rem; }
.grid th { color: var(--accent); background: var(--accent-soft); }
.grid td { border: 1px solid var(--line); background: var(--surface-alt); }
table.res { width: 100%; margin-top: 18px; border-collapse: collapse; }
.res th, .res td { padding: 11px 10px; border-bottom: 1px solid var(--line); text-align: left; font-size: .84rem; }
.res th { color: var(--muted); font-size: .75rem; letter-spacing: .04em; text-transform: uppercase; }
footer { padding: 22px 20px 34px; color: var(--muted); text-align: center; font-size: .8rem; }
footer a { color: var(--accent); font-weight: 700; text-decoration: none; }
footer a:hover { text-decoration: underline; }

@media (max-width: 600px) {
  .hero { min-height: 300px; padding: 82px 20px 64px; }
  .hero-inner { padding-right: 0; }
  .language-switcher { top: 14px; right: 14px; }
  .language-switcher select { width: 158px; }
  .hero-inner, main { width: min(100% - 28px, 940px); }
  .card { padding: 21px 18px; }
  .toast { right: 14px; bottom: 14px; }
  .file-picker-label { align-items: flex-start; }
  .file-picker-action { margin-top: 2px; }
}