:root {
  --bg: #f4f5f9;
  --panel: #ffffff;
  --text: #1b2030;
  --muted: #67708a;
  --border: #d9dce8;
  --accent: #4353ff;
  --accent-soft: rgba(67, 83, 255, 0.08);
  --ok: #148a51;
  --err: #c92c3c;
  --shadow: 0 1px 2px rgba(20, 24, 48, 0.06), 0 8px 24px rgba(20, 24, 48, 0.05);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12141c;
    --panel: #1b1e2a;
    --text: #e8eaf2;
    --muted: #9aa1b8;
    --border: #303548;
    --accent: #7c89ff;
    --accent-soft: rgba(124, 137, 255, 0.12);
    --ok: #4cc98a;
    --err: #ff7382;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.35);
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

header { max-width: 860px; width: 100%; margin: 2.2rem auto 0; padding: 0 1.25rem; }
header h1 { margin: 0; font-size: 1.7rem; letter-spacing: -0.02em; }
header .tag { margin: 0.15rem 0 0; color: var(--muted); font-size: 0.95rem; }

nav.tabs {
  max-width: 860px; width: 100%; margin: 1.4rem auto 0; padding: 0 1.25rem;
  display: flex; gap: 0.4rem; flex-wrap: wrap;
}
nav.tabs button {
  border: 1px solid var(--border); background: var(--panel); color: var(--muted);
  font: inherit; font-weight: 600; padding: 0.5rem 1.1rem; border-radius: 999px; cursor: pointer;
}
nav.tabs button:hover { color: var(--text); }
nav.tabs button.active { background: var(--accent); border-color: var(--accent); color: #fff; }

main { max-width: 860px; width: 100%; margin: 1rem auto 2rem; padding: 0 1.25rem; flex: 1; }
.panel {
  display: none; background: var(--panel); border: 1px solid var(--border);
  border-radius: 16px; padding: 1.4rem; box-shadow: var(--shadow);
}
.panel.active { display: block; }
.panel h2 { margin: 0 0 0.25rem; font-size: 1.15rem; }
.panel .sub { margin: 0 0 1rem; color: var(--muted); font-size: 0.92rem; }

.drop {
  border: 2px dashed var(--border); border-radius: 12px; padding: 2rem 1rem;
  text-align: center; color: var(--muted); cursor: pointer; transition: border-color 0.15s, background 0.15s;
}
.drop strong { color: var(--text); }
.drop:hover, .drop.over { border-color: var(--accent); background: var(--accent-soft); }
.drop.compact { padding: 0.9rem 1rem; }

.fileinfo {
  display: flex; align-items: center; gap: 0.6rem; margin: 0.9rem 0 0;
  padding: 0.6rem 0.9rem; border: 1px solid var(--border); border-radius: 10px; font-size: 0.95rem;
}
.fileinfo .meta { color: var(--muted); }
.fileinfo .clear { margin-left: auto; }

ul.filelist { list-style: none; margin: 0.9rem 0 0; padding: 0; display: flex; flex-direction: column; gap: 0.45rem; }
ul.filelist li {
  display: flex; align-items: center; gap: 0.65rem; padding: 0.55rem 0.8rem;
  border: 1px solid var(--border); border-radius: 10px; background: var(--panel); cursor: grab;
}
ul.filelist li.dragging { opacity: 0.45; }
ul.filelist .grip { color: var(--muted); letter-spacing: -2px; user-select: none; }
ul.filelist .name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
ul.filelist .meta { color: var(--muted); font-size: 0.85rem; margin-left: auto; white-space: nowrap; }

button.icon {
  border: none; background: none; color: var(--muted); font: inherit; font-size: 1rem;
  cursor: pointer; padding: 0.15rem 0.4rem; border-radius: 6px; line-height: 1;
}
button.icon:hover { color: var(--err); background: var(--accent-soft); }

.actions { margin-top: 1.1rem; display: flex; gap: 0.6rem; align-items: center; flex-wrap: wrap; }
button.primary {
  border: none; background: var(--accent); color: #fff; font: inherit; font-weight: 650;
  padding: 0.6rem 1.4rem; border-radius: 10px; cursor: pointer;
}
button.primary:hover:not(:disabled) { filter: brightness(1.08); }
button.primary:disabled { opacity: 0.45; cursor: default; }
button.ghost {
  border: 1px solid var(--border); background: none; color: var(--text); font: inherit;
  padding: 0.55rem 1rem; border-radius: 10px; cursor: pointer;
}
button.ghost:hover { border-color: var(--accent); color: var(--accent); }

fieldset.options { border: none; margin: 1rem 0 0; padding: 0; display: flex; flex-direction: column; gap: 0.55rem; }
fieldset.options label {
  display: flex; align-items: center; gap: 0.6rem; flex-wrap: wrap; padding: 0.65rem 0.85rem;
  border: 1px solid var(--border); border-radius: 10px; cursor: pointer;
}
fieldset.options label:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }
fieldset.options input[type="text"],
fieldset.options input[type="password"] {
  font: inherit; padding: 0.3rem 0.6rem; border: 1px solid var(--border); border-radius: 8px;
  background: var(--bg); color: var(--text); min-width: 11rem; flex: 1;
}
fieldset.options .desc { color: var(--muted); font-size: 0.88rem; }

.levels { flex-direction: row; flex-wrap: wrap; }
.levels label { flex-direction: column; align-items: flex-start; gap: 0.15rem; flex: 1; min-width: 11.5rem; }
.levels .title { font-weight: 650; }

.status { margin: 0.9rem 0 0; font-size: 0.95rem; min-height: 1.4em; color: var(--muted); }
.status.ok { color: var(--ok); }
.status.err { color: var(--err); }
.status.busy::before {
  content: ""; display: inline-block; width: 0.85em; height: 0.85em; margin-right: 0.5em;
  border: 2px solid var(--muted); border-top-color: transparent; border-radius: 50%;
  vertical-align: -0.1em; animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.notice {
  margin-top: 1rem; padding: 0.7rem 1rem; border-radius: 10px; font-size: 0.92rem;
  background: var(--accent-soft); border: 1px solid var(--border); color: var(--muted);
}

.grid {
  margin-top: 1.1rem; display: grid; gap: 0.7rem;
  grid-template-columns: repeat(auto-fill, minmax(128px, 1fr));
}
.card {
  border: 1px solid var(--border); border-radius: 10px; padding: 0.5rem;
  background: var(--panel); cursor: grab; position: relative;
}
.card.dragging { opacity: 0.45; }
.card .thumb {
  aspect-ratio: 3 / 4; display: flex; align-items: center; justify-content: center;
  overflow: hidden; background: var(--bg); border-radius: 6px;
}
.card canvas { max-width: 100%; max-height: 100%; transition: transform 0.15s; }
.card .bar { display: flex; align-items: center; margin-top: 0.35rem; }
.card .pageno { font-size: 0.8rem; color: var(--muted); }
.card .bar .icon { margin-left: auto; }
.card .bar .icon + .icon { margin-left: 0; }
.card .bar .rotate:hover { color: var(--accent); }

.hint { color: var(--muted); font-size: 0.85rem; margin-top: 0.9rem; }

.auth-overlay {
  position: fixed; inset: 0; z-index: 99; background: var(--bg);
  display: flex; align-items: center; justify-content: center; text-align: center;
}

footer {
  max-width: 860px; width: 100%; margin: 0 auto 1.6rem; padding: 0 1.25rem;
  color: var(--muted); font-size: 0.85rem;
}