*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:       #0d0f14;
  --surface:  #181b22;
  --border:   #2a2d38;
  --accent:   #4fa3e0;
  --accent-h: #6bb8f5;
  --text:     #d4d8e2;
  --muted:    #6b7080;
  --error:    #e05c4f;
  --ok:       #4fc87a;
}

body {
  background: var(--bg);
  color: var(--text);
  font: 15px/1.6 system-ui, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 3rem 1.5rem;
  gap: 2rem;
}

/* Shared site nav */
.site-nav {
  width: 100%;
  max-width: 540px;
}

.site-nav__brand {
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
}

.site-nav__brand:hover { color: var(--accent); }

header { text-align: center; }

h1 {
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -.02em;
  color: #fff;
}

h1 span { color: var(--accent); }

header p {
  margin-top: .5rem;
  color: var(--muted);
  max-width: 48ch;
}

main {
  width: 100%;
  max-width: 540px;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

/* Landing page tool list: one card per row — the page is narrow and won't
   have enough tools any time soon to justify a multi-column grid. */
.tool-grid {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  width: 100%;
}

.tool-card {
  display: flex;
  flex-direction: column;
  gap: .5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
  text-decoration: none;
  transition: border-color .15s, background .15s;
}

.tool-card:hover { border-color: var(--accent); background: #1a1f2e; }

.tool-card h2 {
  font-size: 1.1rem;
  font-weight: 600;
  color: #fff;
}

.tool-card p {
  color: var(--muted);
  font-size: .875rem;
}

/* Drop zone */
.drop-zone {
  border: 2px dashed var(--border);
  border-radius: 10px;
  padding: 3rem 2rem;
  text-align: center;
  cursor: pointer;
  transition: border-color .15s, background .15s;
  background: var(--surface);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .75rem;
}

.drop-zone:hover,
.drop-zone.drag-over { border-color: var(--accent); background: #1a1f2e; }

.drop-zone svg { color: var(--muted); }
.drop-zone.drag-over svg { color: var(--accent); }

.drop-zone p { color: var(--muted); font-size: .9rem; }
.drop-zone p strong { color: var(--text); }

.drop-zone input[type="file"] { display: none; }

/* File chip shown after selection */
.file-chip {
  display: none;
  align-items: center;
  gap: .6rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: .5rem .85rem;
  font-size: .875rem;
}

.file-chip.visible { display: flex; }

.file-chip .name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--text);
}

.file-chip .size { color: var(--muted); white-space: nowrap; }

.file-chip button {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--muted);
  padding: 0;
  line-height: 1;
  font-size: 1rem;
}

.file-chip button:hover { color: var(--error); }

/* Action button */
.btn-convert {
  padding: .7rem 1.5rem;
  border-radius: 7px;
  border: none;
  background: var(--accent);
  color: #fff;
  font: inherit;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: background .15s;
  width: 100%;
}

.btn-convert:hover:not(:disabled) { background: var(--accent-h); }

.btn-convert:disabled {
  opacity: .35;
  cursor: not-allowed;
}

/* Status / result */
.status {
  display: none;
  border-radius: 7px;
  padding: .75rem 1rem;
  font-size: .875rem;
  line-height: 1.5;
}

.status.visible { display: block; }
.status.error   { background: #2a1614; border: 1px solid #5c2520; color: var(--error); }
.status.ok      { background: #112214; border: 1px solid #1e4d2e; color: var(--ok); }
.status.info    { background: var(--surface); border: 1px solid var(--border); color: var(--muted); }

/* Download button */
.btn-download {
  display: none;
  padding: .7rem 1.5rem;
  border-radius: 7px;
  border: 1px solid var(--ok);
  background: transparent;
  color: var(--ok);
  font: inherit;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: background .15s;
  width: 100%;
  text-align: center;
  text-decoration: none;
}

.btn-download:hover { background: #112214; }
.btn-download.visible { display: block; }

/* Info section */
details {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

summary {
  padding: .75rem 1rem;
  cursor: pointer;
  font-size: .875rem;
  color: var(--muted);
  user-select: none;
}

summary:hover { color: var(--text); }

.details-body {
  padding: .25rem 1rem 1rem;
  font-size: .875rem;
  color: var(--muted);
  line-height: 1.7;
  border-top: 1px solid var(--border);
}

.details-body p + p { margin-top: .6rem; }
.details-body code {
  background: #0d0f14;
  border-radius: 3px;
  padding: .1em .35em;
  font-size: .85em;
  color: var(--accent);
}

footer {
  color: var(--muted);
  font-size: .8rem;
  text-align: center;
}

footer a { color: inherit; }