:root {
  --bg: #12151b;
  --card: #1a1f28;
  --card2: #202733;
  --fg: #e6e9ef;
  --dim: #8a93a5;
  --accent: #4ea1ff;
  --accent2: #2d7fdd;
  --ok: #4dd08a;
  --warn: #ffb454;
  --err: #ff6b6b;
  --border: #2c3542;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

header {
  padding: 34px 20px 8px;
  max-width: 880px;
  margin: 0 auto;
}

h1 { margin: 0; font-size: 26px; letter-spacing: .2px; }
h1 .sub { color: var(--dim); font-weight: 400; font-size: 18px; }
.tagline { color: var(--dim); max-width: 70ch; }
.tagline strong { color: var(--fg); }

main { max-width: 880px; margin: 0 auto; padding: 8px 20px 40px; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 20px;
  margin: 16px 0;
}

h2 { font-size: 17px; margin: 0 0 12px; display: flex; align-items: center; gap: 10px; }

.stepnum {
  display: inline-grid;
  place-items: center;
  width: 24px; height: 24px;
  border-radius: 50%;
  background: var(--accent2);
  color: #fff;
  font-size: 13px;
  font-weight: 600;
}

.drop {
  border: 2px dashed var(--border);
  border-radius: 10px;
  padding: 18px;
  text-align: center;
  color: var(--dim);
  transition: border-color .15s, background .15s;
}
.drop.over { border-color: var(--accent); background: #1d2634; }
.drop p { margin: 6px 0; }
.drop .path { font-family: ui-monospace, monospace; font-size: 13px; color: var(--fg); }

.btn {
  display: inline-block;
  border: none;
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  color: #fff;
  background: var(--accent2);
}
.btn:hover { background: var(--accent); }
.btn:disabled { background: #333c4a; color: var(--dim); cursor: not-allowed; }
.btn.secondary { background: #2a3342; }
.btn.secondary:hover { background: #354052; }

.filelist { list-style: none; padding: 0; margin: 10px 0 0; }
.filelist li {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 6px 10px;
  background: var(--card2);
  border-radius: 6px;
  margin: 4px 0;
  font-family: ui-monospace, monospace;
  font-size: 13px;
}
.filelist .fsize { color: var(--dim); }
#gameInfo { font-family: ui-monospace, monospace; font-size: 13px; color: var(--ok); margin: 10px 0 0; }

.hint { color: var(--dim); font-size: 13px; }
code { background: var(--card2); padding: 1px 6px; border-radius: 5px; font-size: 13px; }

.progress { margin-top: 14px; }
.bar { height: 8px; background: var(--card2); border-radius: 5px; overflow: hidden; }
.fill { height: 100%; width: 0; background: linear-gradient(90deg, var(--accent2), var(--accent)); transition: width .2s; }
#status { color: var(--dim); font-size: 13px; margin: 8px 0 0; }

.error { color: var(--err); margin-top: 12px; white-space: pre-wrap; }

#resultCard h3 { font-size: 15px; margin: 18px 0 8px; }
#resultCard h3.warn { color: var(--warn); }
.dim { color: var(--dim); font-weight: 400; }

ol.order { margin: 0; padding-left: 22px; }
ol.order li { font-family: ui-monospace, monospace; font-size: 13px; padding: 2px 0; }

ul.conflicts { margin: 0; padding-left: 22px; }
ul.conflicts li { font-family: ui-monospace, monospace; font-size: 13px; color: var(--warn); padding: 2px 0; word-break: break-word; }

.ok { color: var(--ok); }

footer {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 20px 40px;
  color: var(--dim);
  font-size: 13px;
}
footer a { color: var(--accent); text-decoration: none; }
footer a:hover { text-decoration: underline; }