:root {
  --bg: #f4efe5;
  --bg-strong: #efe6d7;
  --ink: #1c1a17;
  --muted: #6e665d;
  --card: rgba(255, 252, 247, 0.92);
  --line: rgba(28, 26, 23, 0.12);
  --line-strong: rgba(28, 26, 23, 0.2);
  --good: #14735f;
  --good-soft: rgba(20, 115, 95, 0.12);
  --bad: #b23a2a;
  --bad-soft: rgba(178, 58, 42, 0.1);
  --warn: #9a6a12;
  --warn-soft: rgba(154, 106, 18, 0.12);
  --accent: #174d43;
  --accent-soft: #dcebe4;
  --shadow: 0 16px 50px rgba(28, 26, 23, 0.06);
}

:root[data-theme='dark'] {
  --bg: #121513;
  --bg-strong: #0f1210;
  --ink: #f3efe7;
  --muted: #b4aca0;
  --card: rgba(22, 27, 24, 0.9);
  --line: rgba(243, 239, 231, 0.1);
  --line-strong: rgba(243, 239, 231, 0.2);
  --good: #68d2b6;
  --good-soft: rgba(104, 210, 182, 0.14);
  --bad: #ff8c7c;
  --bad-soft: rgba(255, 140, 124, 0.12);
  --warn: #f0c46b;
  --warn-soft: rgba(240, 196, 107, 0.14);
  --accent: #8ad3be;
  --accent-soft: rgba(138, 211, 190, 0.15);
  --shadow: 0 18px 48px rgba(0, 0, 0, 0.28);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  font-family: Georgia, 'Iowan Old Style', serif;
  background:
    radial-gradient(circle at top left, rgba(23, 77, 67, 0.18), transparent 28%),
    radial-gradient(circle at bottom right, rgba(178, 58, 42, 0.12), transparent 30%),
    linear-gradient(180deg, color-mix(in srgb, var(--bg) 86%, white 14%), var(--bg));
}
button, input, select, textarea { font: inherit; }
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.92em;
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  padding: 0.1rem 0.3rem;
  border-radius: 6px;
}
.shell {
  width: min(1120px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 36px 0 52px;
}

#summary-card {
  scroll-margin-top: 16px;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 22px;
  margin-bottom: 18px;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
}
.hero { position: relative; overflow: hidden; }
.hero::after {
  content: '';
  position: absolute;
  inset: auto -80px -80px auto;
  width: 240px;
  height: 240px;
  background: radial-gradient(circle, rgba(23, 77, 67, 0.14), transparent 68%);
  pointer-events: none;
}
.hero-top {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: flex-start;
}
.eyebrow {
  margin: 0 0 10px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font: 600 12px/1.2 ui-monospace, SFMono-Regular, Menlo, monospace;
  color: var(--accent);
}
h1, h2, h3 { margin: 0; font-weight: 600; }
h1 { font-size: clamp(30px, 4.2vw, 46px); line-height: 0.98; max-width: 14ch; }
h2 { font-size: clamp(24px, 3vw, 34px); }
h3 { font-size: 20px; margin-top: 24px; }
p, li, .status, .metric-label, .dropzone-copy, .dropzone-title, th, td, button, .section-head p {
  font-family: 'Helvetica Neue', Arial, sans-serif;
}
.lede { max-width: 56ch; color: var(--muted); font-size: 17px; line-height: 1.58; margin: 12px 0 0; }
.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}
.section-head.compact { align-items: center; }
.section-head p { margin: 0; color: var(--muted); line-height: 1.5; }
.mode-switch {
  display: inline-flex;
  gap: 8px;
  padding: 6px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--ink) 5%, transparent);
  border: 1px solid var(--line);
}
.mode-switch button {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--muted);
  padding: 10px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: background 160ms ease, color 160ms ease, transform 160ms ease;
}
.mode-switch button:hover { color: var(--ink); }
.mode-switch button.active { background: var(--accent); color: #fff; }
.mode-copy { margin: 0 0 18px; color: var(--muted); line-height: 1.55; }
.dropzone {
  display: grid;
  place-items: center;
  min-height: 160px;
  border: 2px dashed color-mix(in srgb, var(--accent) 28%, transparent);
  border-radius: 20px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent-soft) 86%, transparent), color-mix(in srgb, var(--card) 88%, transparent));
  cursor: pointer;
  text-align: center;
  padding: 24px;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}
.dropzone:hover, .dropzone.drag {
  transform: translateY(-2px);
  border-color: var(--accent);
}
.dropzone input { display: none; }
.dropzone-title { display: block; font-size: clamp(22px, 3vw, 28px); font-weight: 700; color: var(--ink); }
.dropzone-copy { display: block; margin-top: 8px; color: var(--muted); line-height: 1.45; }
.status { margin: 14px 0 0; color: var(--muted); }
.result-banner {
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 18px 20px;
  background: color-mix(in srgb, var(--card) 85%, transparent);
  margin-bottom: 18px;
}
.result-banner.pass { border-color: color-mix(in srgb, var(--good) 28%, transparent); background: var(--good-soft); }
.result-banner.warn { border-color: color-mix(in srgb, var(--warn) 28%, transparent); background: var(--warn-soft); }
.result-banner.fail { border-color: color-mix(in srgb, var(--bad) 28%, transparent); background: var(--bad-soft); }
.result-banner-title {
  margin: 0;
  font: 700 13px/1.2 ui-monospace, SFMono-Regular, Menlo, monospace;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.result-banner-copy { margin: 8px 0 0; color: var(--muted); line-height: 1.55; }
.summary-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px; }
.metric { padding: 18px; border-radius: 18px; background: color-mix(in srgb, var(--card) 88%, transparent); border: 1px solid var(--line); }
.metric-value {
  font-size: clamp(22px, 4vw, 34px);
  font-weight: 700;
  line-height: 1.05;
  overflow-wrap: anywhere;
  word-break: break-word;
}
.metric-label { margin-top: 6px; color: var(--muted); line-height: 1.45; }
.secondary-note { margin: 14px 0 0; color: var(--muted); }
.issue-list { display: grid; gap: 12px; }
.failure-item, .warning-item { border-radius: 18px; padding: 16px 18px; border: 1px solid var(--line); background: color-mix(in srgb, var(--card) 90%, transparent); }
.failure-item { border-color: color-mix(in srgb, var(--bad) 22%, transparent); background: color-mix(in srgb, var(--bad-soft) 68%, var(--card)); }
.warning-item { border-color: color-mix(in srgb, var(--warn) 22%, transparent); background: color-mix(in srgb, var(--warn-soft) 68%, var(--card)); }
.fail-path { font: 600 15px/1.45 ui-monospace, SFMono-Regular, Menlo, monospace; word-break: break-word; }
.fail-reason { margin-top: 8px; line-height: 1.6; }
.failure-item .fail-reason { color: var(--bad); }
.warning-item .fail-reason { color: var(--warn); }
.table-wrap { overflow: auto; border-radius: 16px; border: 1px solid var(--line); }
table { width: 100%; border-collapse: collapse; background: color-mix(in srgb, var(--card) 92%, transparent); }
th, td { text-align: left; padding: 14px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: 0.08em; background: color-mix(in srgb, var(--ink) 3%, transparent); }
.code { font: 13px/1.5 ui-monospace, SFMono-Regular, Menlo, monospace; word-break: break-word; }
.badge { display: inline-flex; align-items: center; padding: 6px 10px; border-radius: 999px; font: 700 12px/1 ui-monospace, SFMono-Regular, Menlo, monospace; }
.badge.pass { color: var(--good); background: var(--good-soft); }
.badge.fail { color: var(--bad); background: var(--bad-soft); }
.badge.warn { color: var(--warn); background: var(--warn-soft); }
.badge.neutral { color: var(--muted); background: color-mix(in srgb, var(--ink) 6%, transparent); }
.about-actions { padding: 0; background: transparent; border: 0; box-shadow: none; backdrop-filter: none; }
.ghost-button {
  appearance: none;
  border: 1px solid var(--line-strong);
  background: color-mix(in srgb, var(--card) 92%, transparent);
  color: var(--ink);
  border-radius: 999px;
  padding: 12px 16px;
  cursor: pointer;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}
.ghost-button:hover { transform: translateY(-1px); border-color: var(--accent); }
.small-button { padding: 10px 14px; font-size: 14px; }
.theme-toggle { white-space: nowrap; }
.prose p, .prose li { color: var(--muted); line-height: 1.7; }
.prose ul { margin: 16px 0 0; padding-left: 20px; }
.prose li + li { margin-top: 8px; }
.hidden { display: none; }
@media (min-width: 841px) and (max-width: 1440px) {
  .hero-top {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: start;
    gap: 16px;
  }

  .uploader-card .section-head.compact {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: start;
    gap: 12px;
  }

  .hero .theme-toggle {
    margin-top: 0;
  }
}

@media (max-width: 840px) {
  .shell { width: min(100vw - 20px, 1120px); padding-top: 28px; }
  .card { padding: 18px; border-radius: 18px; }
  .hero-top, .section-head, .section-head.compact { display: block; }
  .section-head p { margin-top: 8px; }
  .mode-switch, .theme-toggle, .small-button { margin-top: 14px; }
  .mode-switch { flex-wrap: wrap; }
  h1 { max-width: none; }
}