:root {
  --bg: #0f1117;
  --bg-card: #171a23;
  --border: #2a2e3a;
  --text: #e7e9ee;
  --text-muted: #9aa0ae;
  --accent: #6d8dff;
  --red: #ff5d6c;
  --red-bg: #2b1418;
  --orange: #ffb454;
  --orange-bg: #2b2114;
  --green: #4ade80;
  --green-bg: #12261b;
  --blue: #60a5fa;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.topbar {
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.topnav {
  display: flex;
  gap: 1.2rem;
}

.topnav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
}

.topnav a:hover {
  color: var(--text);
}

.brand {
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  font-size: 1.05rem;
}

.wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

.hero h1 {
  font-size: 1.6rem;
  margin-bottom: 0.5rem;
}

.hero .sub {
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.dropzone-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.dropzone {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 3rem 1rem;
  border: 2px dashed var(--border);
  border-radius: 12px;
  cursor: pointer;
  text-align: center;
  transition: border-color 0.15s, background 0.15s;
}

.dropzone:hover, .dz-active {
  border-color: var(--accent);
  background: rgba(109, 141, 255, 0.06);
}

.dropzone input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.dz-icon { font-size: 2rem; }
.dz-text { color: var(--text-muted); }
.dz-filename { font-weight: 600; color: var(--accent); min-height: 1.2em; }

.btn-primary, .btn-secondary {
  display: inline-block;
  padding: 0.7rem 1.4rem;
  border-radius: 8px;
  border: none;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
}

.btn-primary {
  background: var(--accent);
  color: #0f1117;
}

.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  margin-top: 2rem;
}

.alert-error {
  background: var(--red-bg);
  border: 1px solid var(--red);
  color: var(--red);
  padding: 0.8rem 1rem;
  border-radius: 8px;
  margin-bottom: 1.5rem;
}

.banner {
  padding: 1.2rem 1.4rem;
  border-radius: 12px;
  margin-bottom: 1.5rem;
  border: 1px solid var(--border);
}

.banner h2 { margin: 0 0 0.4rem; font-size: 1.2rem; }
.banner p { margin: 0; color: var(--text-muted); }

.banner-critical { background: var(--red-bg); border-color: var(--red); }
.banner-critical h2 { color: var(--red); }

.banner-warning { background: var(--orange-bg); border-color: var(--orange); }
.banner-warning h2 { color: var(--orange); }

.banner-clean { background: var(--green-bg); border-color: var(--green); }
.banner-clean h2 { color: var(--green); }

.file-card, .flags, .byte-hits, .raw {
  margin-bottom: 1.8rem;
}

.file-card h3, .flags h3, .byte-hits h3 {
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--text-muted);
  margin-bottom: 0.8rem;
}

.file-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.3rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.2rem;
}

.file-grid dt { color: var(--text-muted); }
.file-grid dd { margin: 0; }

.flag-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.flag {
  display: flex;
  gap: 0.8rem;
  padding: 0.9rem 1.1rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-card);
}

.flag-critical { border-left: 4px solid var(--red); }
.flag-warning { border-left: 4px solid var(--orange); }
.flag-info { border-left: 4px solid var(--blue); }

.flag-badge {
  flex-shrink: 0;
  height: fit-content;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  letter-spacing: 0.03em;
}

.flag-critical .flag-badge { background: var(--red-bg); color: var(--red); }
.flag-warning .flag-badge { background: var(--orange-bg); color: var(--orange); }
.flag-info .flag-badge { background: rgba(96, 165, 250, 0.12); color: var(--blue); }

.flag-title { margin: 0 0 0.2rem; font-weight: 600; }
.flag-desc { margin: 0; color: var(--text-muted); font-size: 0.92rem; }

.muted { color: var(--text-muted); }

.chips { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 0.5rem; }
.chip {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  font-family: monospace;
  font-size: 0.85rem;
}

.raw summary {
  cursor: pointer;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.raw-json {
  margin-top: 1rem;
  padding: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow-x: auto;
  font-size: 0.8rem;
  max-height: 500px;
  overflow-y: auto;
}

.degrade-level {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.8rem 1.2rem;
  color: var(--text-muted);
}

.degrade-level legend {
  padding: 0 0.4rem;
  font-size: 0.85rem;
}

.degrade-level label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text);
  cursor: pointer;
}

.select-field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.select-field select {
  padding: 0.6rem 0.8rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text);
  font-size: 1rem;
}

.select-field .hint {
  font-size: 0.82rem;
}

.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 1.8rem;
}

@media (max-width: 640px) {
  .compare-grid { grid-template-columns: 1fr; }
}

.caveat {
  font-size: 0.88rem;
}

.footer {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8rem;
  padding: 1.5rem;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f7f8fa;
    --bg-card: #ffffff;
    --border: #e2e4ea;
    --text: #1a1c23;
    --text-muted: #676c7a;
    --red-bg: #fdecee;
    --orange-bg: #fef3e2;
    --green-bg: #eafbf1;
  }
}