:root {
  --bg0: #0f1c1a;
  --bg1: #16302b;
  --ink: #f3f6f4;
  --muted: #a8b8b3;
  --card: rgba(20, 42, 38, 0.92);
  --line: rgba(210, 230, 220, 0.14);
  --accent: #3dba8c;
  --accent2: #d4a15a;
  --danger: #e07171;
  --radius: 14px;
  --font: "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  --display: "IBM Plex Sans", "Noto Sans TC", sans-serif;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg0);
  min-height: 100%;
}

.bg {
  position: fixed;
  inset: 0;
  background:
    radial-gradient(900px 500px at 10% -10%, rgba(61, 186, 140, 0.22), transparent 60%),
    radial-gradient(700px 400px at 90% 10%, rgba(212, 161, 90, 0.12), transparent 55%),
    linear-gradient(165deg, var(--bg0), var(--bg1) 55%, #0c1614);
  z-index: -1;
}

.shell {
  width: min(760px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2.5rem 0 4rem;
}

.brand { margin-bottom: 1.5rem; }
.eyebrow {
  margin: 0 0 0.35rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-size: 0.75rem;
  color: var(--accent);
  font-family: var(--display);
}
.brand h1 {
  margin: 0;
  font-family: var(--display);
  font-weight: 600;
  font-size: clamp(1.6rem, 3vw, 2.1rem);
}
.sub { margin: 0.45rem 0 0; color: var(--muted); }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.35rem 1.4rem 1.5rem;
  backdrop-filter: blur(8px);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.28);
}

.card h2 { margin: 0 0 0.4rem; font-size: 1.15rem; }
.card h3 { margin: 0 0 0.5rem; font-size: 1rem; }
.hint { color: var(--muted); font-size: 0.9rem; margin: 0.2rem 0 1rem; }
.hint.tight { margin: 0.15rem 0 0.45rem; }
.buyer-hist-wrap { margin: -0.2rem 0 1rem; }
.chips { display: flex; flex-wrap: wrap; gap: 0.4rem; min-height: 1.5rem; }
.chip {
  font: inherit;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--ink);
  background: rgba(61, 186, 140, 0.12);
  border: 1px solid rgba(61, 186, 140, 0.35);
  border-radius: 999px;
  padding: 0.35rem 0.75rem;
  cursor: pointer;
}
.chip:hover { background: rgba(61, 186, 140, 0.22); }
.chip-empty { color: var(--muted); font-size: 0.85rem; }
.hint code {
  font-size: 0.85em;
  background: rgba(255,255,255,0.06);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.92rem;
  margin-bottom: 0.9rem;
}
input, select {
  font: inherit;
  color: var(--ink);
  background: rgba(0,0,0,0.28);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.7rem 0.8rem;
}
input:focus, select:focus {
  outline: 2px solid rgba(61, 186, 140, 0.45);
  border-color: transparent;
}

.grid2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8rem;
}
@media (max-width: 640px) {
  .grid2 { grid-template-columns: 1fr; }
}

.row.between {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 0.5rem;
}

.drop {
  border: 1.5px dashed rgba(61, 186, 140, 0.45);
  border-radius: 12px;
  padding: 1.4rem 1rem;
  text-align: center;
  cursor: pointer;
  background: rgba(61, 186, 140, 0.06);
  margin-bottom: 0.8rem;
  transition: background 0.15s, border-color 0.15s;
}
.drop:hover, .drop.drag {
  background: rgba(61, 186, 140, 0.12);
  border-color: var(--accent);
}
.drop p { margin: 0.2rem 0; }

.file-list {
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
  max-height: 220px;
  overflow: auto;
  font-size: 0.88rem;
  color: var(--muted);
}
.file-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  padding: 0.35rem 0;
  border-bottom: 1px solid var(--line);
}
.file-list .fname {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}
.file-list .badge {
  flex-shrink: 0;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  border: 1px solid var(--line);
}
.file-list .badge.pending { color: #c9b27a; }
.file-list .badge.uploading { color: #7ec8ff; }
.file-list .badge.retrying { color: #7ec8ff; }
.file-list .badge.done { color: #4fd6a0; border-color: rgba(79, 214, 160, 0.45); }
.file-list .badge.error { color: #ff8f8f; border-color: rgba(255, 143, 143, 0.45); }
#upload-summary { margin: 0.4rem 0 0.2rem; }
#btn-retry-upload { margin: 0 0 0.8rem; padding: 0.45rem 0.9rem; font-size: 0.85rem; }

button, .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font: inherit;
  font-weight: 600;
  border: 0;
  border-radius: 999px;
  padding: 0.75rem 1.25rem;
  cursor: pointer;
  text-decoration: none;
  color: #062018;
  background: linear-gradient(135deg, #4fd6a0, #2ea876);
}
button:disabled { opacity: 0.5; cursor: not-allowed; }
button.ghost, .btn.secondary {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
}
.btn.secondary { color: var(--ink); }
.actions { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: 0.8rem; }

.status {
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}
.err { color: var(--danger); font-size: 0.9rem; white-space: pre-wrap; }
[hidden] { display: none !important; }

.usage-box {
  margin: 0 0 1rem;
  padding: 0.7rem 0.9rem;
  border-radius: 10px;
  border: 1px solid rgba(61, 186, 140, 0.28);
  background: rgba(61, 186, 140, 0.08);
  font-size: 0.9rem;
}
.usage-box p { margin: 0; }
.usage-box.warn {
  border-color: rgba(212, 161, 90, 0.45);
  background: rgba(212, 161, 90, 0.1);
}
.usage-box.danger {
  border-color: rgba(224, 113, 113, 0.45);
  background: rgba(224, 113, 113, 0.1);
}
.table-wrap {
  overflow: auto;
  margin: 0.6rem 0 1.2rem;
  border: 1px solid var(--line);
  border-radius: 10px;
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
}
th, td {
  text-align: left;
  padding: 0.45rem 0.55rem;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
th { color: var(--muted); font-weight: 500; }
.admin-create h3 { margin: 0.4rem 0 0.6rem; font-size: 1rem; }
.admin-create button { margin-top: 0.6rem; }
td .mini {
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  margin-right: 0.25rem;
}
#panel-admin { margin-top: 1rem; }

.howto-box {
  margin-top: 1.2rem;
  padding: 0.7rem 0.95rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--muted);
  font-size: 0.9rem;
}
.howto-box summary {
  cursor: pointer;
  color: var(--ink);
  font-weight: 600;
}
.howto {
  margin: 0.7rem 0 0.4rem;
  padding-left: 1.2rem;
  color: var(--ink);
  line-height: 1.55;
}
.howto li { margin: 0.35rem 0; }
.howto ul {
  margin: 0.35rem 0;
  padding-left: 1.1rem;
  color: var(--muted);
}
.howto code, .howto-box code {
  font-size: 0.85em;
  background: rgba(255,255,255,0.06);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

.pwd-box {
  margin: 0 0 1rem;
  padding: 0.55rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--muted);
  font-size: 0.9rem;
}
.pwd-box summary { cursor: pointer; color: var(--ink); font-weight: 500; }
.pwd-form {
  display: grid;
  gap: 0.55rem;
  margin-top: 0.7rem;
}
.pwd-form button { justify-self: start; }

.auth-tabs {
  display: flex;
  gap: 0.4rem;
  margin: 0 0 1rem;
}
.auth-tabs .tab {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.4rem 0.9rem;
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
}
.auth-tabs .tab.on {
  color: #062018;
  background: linear-gradient(135deg, #4fd6a0, #2ea876);
  border-color: transparent;
}