:root {
  --bg: #f4f6fa; --card: #fff; --text: #1c2433; --muted: #5d6b82; --line: #d9dfea;
  --btn: #1f3864; --btn-hover: #2e5aa8; --ok: #1e6b3a; --bad: #c0392b; --hover: #eef3fc;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f141c; --card: #171e29; --text: #e6ebf3; --muted: #9aa7bb; --line: #2c3648;
    --btn: #2e5aa8; --btn-hover: #4170c4; --ok: #6fd39a; --bad: #ff7b6b; --hover: #1e2a3d;
  }
}
:root[data-theme="dark"] {
  --bg: #0f141c; --card: #171e29; --text: #e6ebf3; --muted: #9aa7bb; --line: #2c3648;
  --btn: #2e5aa8; --btn-hover: #4170c4; --ok: #6fd39a; --bad: #ff7b6b; --hover: #1e2a3d;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif; }
main { max-width: 640px; margin: 0 auto; padding: 48px 16px; display: grid; gap: 16px; }
h1 { font-size: 22px; margin: 0; }
.drop {
  display: block; text-align: center; padding: 40px 16px; cursor: pointer; font-weight: 600;
  background: var(--card); border: 2px dashed var(--line); border-radius: 12px; transition: border-color .15s, background .15s;
}
.drop:hover, .drop.over { border-color: var(--btn-hover); background: var(--hover); }
.drop:focus-within { outline: 3px solid var(--btn-hover); outline-offset: 2px; }
.files { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.files:empty { display: none; }
.files li {
  display: flex; justify-content: space-between; gap: 12px; padding: 8px 12px; font-size: 14px;
  background: var(--card); border: 1px solid var(--line); border-radius: 8px;
}
.files .name { overflow-wrap: anywhere; min-width: 0; }
.files .st { color: var(--muted); white-space: nowrap; }
.files .ok .st { color: var(--ok); }
.files .err .st { color: var(--bad); }
.actions { display: flex; gap: 8px; flex-wrap: wrap; }
.btn {
  font: inherit; font-weight: 600; border: 0; border-radius: 8px; padding: 10px 18px; cursor: pointer;
  background: var(--btn); color: #fff;
}
.btn:hover:not(:disabled) { background: var(--btn-hover); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.ghost { background: transparent; color: var(--text); border: 1px solid var(--line); }
.btn.ghost:hover:not(:disabled) { background: var(--hover); }
@media (max-width: 480px) { .btn { flex: 1 1 100%; } }