:root {
  --kb-bg-primary: #030712;
  --kb-bg-secondary: #0f172a;
  --kb-text-primary: #f8fafc;
  --kb-text-secondary: #cbd5e1;
  --kb-green: #00ff8f;
  --kb-blue: #00a4fb;
  --kb-accent: #00a4fb;
  --kb-accent-dark: #0075b5;
  --kb-emerald: #00b368;
  --kb-gradient: linear-gradient(90deg, #00ff8f, #00a4fb);

  --card-bg: #ffffff;
  --card-text: #0f172a;
  --card-muted: #5b6577;
  --card-line: #e5e9f0;
  --card-soft: #f4f7fb;
  --danger: #c2410c;

  --font-heading: 'Space Grotesk', system-ui, sans-serif;
  --font-wordmark: 'Raleway', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --font-mono: ui-monospace, 'JetBrains Mono', monospace;
  --radius: 16px;
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }

html, body { margin: 0; min-height: 100%; }
body {
  font-family: var(--font-body);
  background: var(--kb-bg-primary);
  color: var(--kb-text-primary);
  -webkit-font-smoothing: antialiased;
}

.backdrop {
  position: fixed;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(60vw 60vw at 85% 15%, rgba(0, 164, 251, 0.28), transparent 60%),
    radial-gradient(50vw 50vw at 70% 90%, rgba(0, 255, 143, 0.14), transparent 60%),
    radial-gradient(40vw 40vw at 10% 80%, rgba(0, 164, 251, 0.16), transparent 60%),
    var(--kb-bg-secondary);
}

.site-header {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: clamp(40px, 8vh, 88px) 16px 0;
}
.site-mark { width: clamp(64px, 7vw, 96px); height: auto; }
.site-name {
  margin-top: 18px;
  font-family: var(--font-wordmark);
  font-weight: 400;
  font-size: clamp(22px, 2.2vw, 30px);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding-left: 0.12em;
}
.site-sub {
  margin-top: 8px;
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--kb-green);
}

.layout {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 560px) minmax(0, 1fr);
  align-items: center;
  gap: 64px;
  max-width: 1280px;
  margin: 0 auto;
  padding: clamp(32px, 6vh, 64px) clamp(16px, 5vw, 80px) 48px;
}

.card {
  background: var(--card-bg);
  color: var(--card-text);
  border-radius: var(--radius);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.45);
  padding: 28px;
  width: 100%;
}

h1 {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 24px;
  line-height: 1.25;
  margin: 0 0 8px;
}
p { margin: 0 0 16px; line-height: 1.55; }
.muted { color: var(--card-muted); }
.small { font-size: 14px; }
.tiny { font-size: 12px; margin: 12px 0 0; }
.mono { font-family: var(--font-mono); font-size: 0.95em; }
.eyebrow {
  font-size: 12px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--kb-accent-dark); margin-bottom: 6px;
}

.stack { display: grid; gap: 14px; }
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

.field { display: grid; gap: 6px; font-size: 13px; font-weight: 500; color: var(--card-muted); }
.field input {
  font: inherit; font-size: 15px; color: var(--card-text);
  padding: 11px 12px;
  border: 1px solid var(--card-line);
  border-radius: 10px;
  background: #fff;
}
.field input:focus, .dpa:focus, .btn:focus-visible, .add:focus-visible, .check input:focus-visible {
  outline: 2px solid var(--kb-accent);
  outline-offset: 2px;
}
#code-input { font-family: var(--font-mono); letter-spacing: 0.08em; text-transform: uppercase; }

.check { display: flex; gap: 10px; align-items: flex-start; font-size: 14px; line-height: 1.45; }
.check input { width: 18px; height: 18px; margin-top: 1px; accent-color: var(--kb-accent); flex: none; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font: inherit; font-weight: 600; font-size: 15px;
  padding: 12px 20px;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background 150ms ease, opacity 150ms ease;
}
.btn svg, .add svg, .badge svg, .pitch svg, .file-remove svg {
  width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 2;
  stroke-linecap: round; stroke-linejoin: round;
}
.btn.primary { background: var(--kb-bg-secondary); color: var(--kb-text-primary); }
.btn.primary:hover:not(:disabled) { background: #1e293b; }
.btn.primary:disabled { opacity: 0.45; cursor: not-allowed; }
.btn.secondary { background: var(--card-soft); color: var(--card-text); border-color: var(--card-line); }
.btn.secondary:hover { background: #e9eef5; }

.dpa {
  max-height: 42vh;
  overflow-y: auto;
  padding: 16px 18px;
  margin: 4px 0 18px;
  border: 1px solid var(--card-line);
  border-radius: 12px;
  background: var(--card-soft);
  font-size: 13.5px;
  line-height: 1.55;
}
.dpa h2 { font-family: var(--font-heading); font-size: 17px; margin: 0 0 4px; }
.dpa h3 { font-size: 14px; margin: 16px 0 6px; }
.dpa p, .dpa ul { margin: 0 0 8px; }
.dpa ul { padding-left: 18px; }
.dpa li { margin-bottom: 4px; }
.dpa .dpa-meta { color: var(--card-muted); font-size: 12.5px; }

.drop {
  display: flex; align-items: center; gap: 16px;
  padding: 20px;
  margin: 16px 0 12px;
  border: 2px dashed var(--card-line);
  border-radius: 14px;
  transition: border-color 150ms ease, background 150ms ease;
}
.drop.over { border-color: var(--kb-accent); background: #eef6fd; }
.drop-title { font-family: var(--font-heading); font-weight: 600; font-size: 17px; }
.add {
  flex: none;
  width: 52px; height: 52px;
  border-radius: 50%;
  border: none;
  background: var(--kb-bg-secondary);
  color: var(--kb-green);
  display: grid; place-items: center;
  cursor: pointer;
}
.add svg { width: 24px; height: 24px; }
.add:hover { background: #1e293b; }

.files { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; max-height: 32vh; overflow-y: auto; }
.files li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 4px 12px;
  align-items: center;
  padding: 10px 12px;
  border: 1px solid var(--card-line);
  border-radius: 10px;
}
.file-name { font-size: 14px; font-weight: 500; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-meta { font-size: 12.5px; color: var(--card-muted); grid-column: 1; }
.file-meta.bad { color: var(--danger); }
.file-remove {
  grid-row: 1 / span 2; grid-column: 2;
  border: none; background: none; color: var(--card-muted);
  width: 32px; height: 32px; border-radius: 8px; cursor: pointer;
  display: grid; place-items: center;
}
.file-remove:hover { background: var(--card-soft); color: var(--card-text); }
.bar { grid-column: 1 / -1; height: 4px; border-radius: 4px; background: var(--card-soft); overflow: hidden; }
.bar > span { display: block; height: 100%; width: 0; background: var(--kb-gradient); transition: width 120ms linear; }
.files.compact li { grid-template-columns: minmax(0, 1fr); }

.footer-bar {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  margin-top: 16px; padding-top: 16px;
  border-top: 1px solid var(--card-line);
}

.error { color: var(--danger); font-size: 14px; margin: 8px 0 0; }

.badge { width: 48px; height: 48px; border-radius: 50%; display: grid; place-items: center; margin-bottom: 14px; }
.badge svg { width: 24px; height: 24px; }
.badge.ok { background: #e7f8f1; color: var(--kb-emerald); }
.badge.warn { background: #fff1e6; color: var(--danger); }
[data-view="done"] .btn, [data-view="problem"] .btn { margin-top: 8px; }
#done-list { margin-bottom: 16px; }

.spinner {
  width: 32px; height: 32px; margin: 32px auto;
  border-radius: 50%;
  border: 3px solid var(--card-line);
  border-top-color: var(--kb-accent);
  animation: spin 800ms linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.pitch h2 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(32px, 3.6vw, 52px);
  line-height: 1.1;
  margin: 0 0 28px;
  max-width: 14ch;
}
.pitch ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.pitch li { display: flex; gap: 12px; align-items: center; color: var(--kb-text-secondary); font-size: 16px; }
.pitch svg { width: 22px; height: 22px; color: var(--kb-green); flex: none; }

@media (max-width: 900px) {
  .site-header { padding-top: 32px; }
  .layout { grid-template-columns: minmax(0, 1fr); gap: 32px; padding: 24px 16px 40px; align-items: start; }
  .pitch h2 { font-size: 28px; max-width: none; }
}
@media (max-width: 520px) {
  .card { padding: 20px; }
  .row { grid-template-columns: 1fr; }
  .footer-bar { flex-direction: column; align-items: stretch; }
  .dpa { max-height: 50vh; }
}
@media (prefers-reduced-motion: reduce) {
  .spinner { animation-duration: 2400ms; }
  .bar > span { transition: none; }
}