:root {
  /* Slightly lighter base so the page reads as a dark theme, not 'black on black'. */
  --bg: #15171f;
  --bg-2: #1d2230;
  --bg-3: #262c3d;
  --border: #3a4258;
  --text: #f4f6fb;
  --text-dim: #c0c5d2;
  --text-mute: #8e96a8;
  --accent: #5ce0f0;
  --accent-2: #95a1ff;
  --good: #5be48d;
  --warn: #f7c069;
  --bad: #f5717e;
  --shadow: 0 8px 24px rgba(0,0,0,0.5);
  color-scheme: dark;
}

/* Force [hidden] to win over any display rule that would override it. */
[hidden] { display: none !important; }

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  font: 13px/1.45 -apple-system, "Segoe UI", system-ui, "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  user-select: none;
  overflow: hidden;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-2);
}
.topbar .brand { display: flex; align-items: center; gap: 8px; }
.topbar .title { font-weight: 600; letter-spacing: 0.2px; }
.topbar .dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
}
.topbar-actions { display: flex; align-items: center; gap: 6px; }
.account-select {
  background: var(--bg-3);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 8px;
  font: inherit;
  max-width: 140px;
  outline: none;
}
.account-select:focus { border-color: var(--accent); }

.icon-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-dim);
  width: 28px; height: 28px;
  border-radius: 6px;
  display: inline-flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: background .12s, color .12s, border-color .12s;
}
.icon-btn:hover { background: var(--bg-3); color: var(--text); border-color: var(--border); }
.icon-btn:active { transform: translateY(1px); }

.content {
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  height: calc(100vh - 49px);
  overflow: auto;
}

.card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  box-shadow: var(--shadow);
}

#overview .row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 4px 0;
}
#overview .row + .row { border-top: 1px dashed rgba(255,255,255,0.04); }
#overview .label { color: var(--text-dim); font-size: 12px; }
#overview .value { color: var(--text); font-weight: 500; }

.usage-head {
  display: flex; justify-content: space-between; align-items: flex-end;
  margin-bottom: 8px;
}
.usage-title { font-weight: 600; font-size: 14px; }
.usage-sub { color: var(--text-dim); font-size: 12px; margin-top: 2px; }
.usage-pct { font-size: 22px; font-weight: 600; color: var(--accent); }
.bar {
  height: 8px; width: 100%;
  background: var(--bg-3);
  border-radius: 999px; overflow: hidden;
}
.bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  border-radius: 999px;
  transition: width .4s ease;
}
.bar-fill.warn { background: linear-gradient(90deg, #f5b454, #ef5d6b); }
.bar-fill.bad { background: linear-gradient(90deg, #ef5d6b, #b5364a); }
.usage-foot { color: var(--text-dim); font-size: 12px; margin-top: 8px; }

.empty { padding: 24px 12px; text-align: center; color: var(--text-dim); }
.empty .hint { font-size: 12px; color: var(--text-mute); }

.error-banner {
  background: rgba(239,93,107,0.12);
  border: 1px solid rgba(239,93,107,0.35);
  color: #ffd6da;
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 12px;
  word-break: break-all;
}

/* Modal */
.modal {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.55);
  display: flex; align-items: center; justify-content: center;
  z-index: 10;
}
.modal-panel {
  width: min(560px, 92vw);
  max-height: 88vh;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 16px 48px rgba(0,0,0,0.55);
  display: flex; flex-direction: column;
  overflow: hidden;
}
.modal-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-3);
}
.modal-title { font-weight: 600; }
.modal-body { padding: 12px 14px; overflow: auto; }

.account-list { display: flex; flex-direction: column; gap: 6px; margin-bottom: 12px; }
.account-row {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 10px;
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: 8px;
}
.account-row .name { font-weight: 600; }
.account-row .meta { color: var(--text-dim); font-size: 12px; }
.account-row .spacer { flex: 1; }
.account-row button { font-size: 12px; padding: 4px 8px; }

details.add-form, details.settings {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 10px;
  margin-bottom: 10px;
}
details.add-form > summary, details.settings > summary {
  cursor: pointer;
  padding: 6px 0;
  font-weight: 600;
  color: var(--text);
}
details.advanced { margin-top: 6px; }
details.advanced > summary { color: var(--text-dim); cursor: pointer; font-size: 12px; }

form label {
  display: block;
  margin: 6px 0;
  color: var(--text-dim);
  font-size: 12px;
}
form input[type="text"], form input[type="password"], form input[type="number"], form textarea {
  display: block;
  width: 100%;
  margin-top: 4px;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 8px;
  font: inherit;
  outline: none;
}
form input:focus, form textarea:focus { border-color: var(--accent); }

.form-actions { display: flex; gap: 6px; margin-top: 10px; flex-wrap: wrap; }
.btn {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 12px;
  cursor: pointer;
  font: inherit;
}
.btn:hover { border-color: var(--accent); }
.btn.primary { background: var(--accent); color: #0a0c10; border-color: var(--accent); font-weight: 600; }
.btn.primary:hover { filter: brightness(1.05); }
.btn.danger { color: var(--bad); border-color: rgba(239,93,107,0.5); }
.btn.danger:hover { background: rgba(239,93,107,0.1); }

.form-result { margin-top: 8px; font-size: 12px; color: var(--text-dim); white-space: pre-wrap; word-break: break-all; }
.form-result.ok { color: var(--good); }
.form-result.err { color: var(--bad); }

/* Scrollbar (Windows) */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #364056; }

/* History modal */
.modal-toolbar {
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
}
.history-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}
.history-controls .range-btns {
  display: flex;
  gap: 4px;
}
.history-controls .range-btns .btn.active {
  background: var(--accent);
  color: #0a0c10;
  border-color: var(--accent);
}
.history-meta {
  font-size: 12px;
  color: var(--text-dim);
  margin-bottom: 6px;
}
.history-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
}
.history-table th, .history-table td {
  text-align: left;
  padding: 6px 8px;
  border-bottom: 1px solid var(--border);
}
.history-table th {
  color: var(--text-dim);
  font-weight: 500;
  position: sticky;
  top: 0;
  background: var(--bg-2);
}
.status-pill {
  display: inline-block;
  padding: 1px 8px;
  border-radius: 999px;
  font-size: 11px;
}
.status-pill.good { background: rgba(91, 228, 141, 0.15); color: var(--good); }
.status-pill.bad  { background: rgba(245, 113, 126, 0.15); color: var(--bad); }

/* =====================
   Mobile Responsive
   ===================== */
@media (max-width: 600px) {
  html, body {
    overflow: auto;
  }

  body {
    font-size: 14px;
  }

  .topbar {
    padding: 8px 10px;
    flex-wrap: wrap;
    gap: 8px;
  }

  .topbar .brand {
    flex: 1;
    min-width: 150px;
  }

  .topbar .title {
    font-size: 14px;
  }

  .topbar-actions {
    flex-wrap: wrap;
    gap: 4px;
  }

  .account-select {
    max-width: 120px;
    font-size: 12px;
  }

  .content {
    padding: 10px 8px;
    gap: 8px;
    height: auto;
    min-height: calc(100vh - 60px);
  }

  .card {
    padding: 10px 12px;
    border-radius: 8px;
  }

  .usage-pct {
    font-size: 18px;
  }

  /* Modal mobile */
  .modal-panel {
    width: 95vw;
    max-height: 92vh;
    border-radius: 10px;
  }

  .modal-body {
    padding: 10px;
  }

  .account-row {
    flex-wrap: wrap;
    gap: 6px;
  }

  .account-row .spacer {
    display: none;
  }

  .account-row .name {
    width: 100%;
    margin-bottom: 4px;
  }

  .account-row button {
    padding: 6px 10px;
    font-size: 12px;
  }

  details.add-form, details.settings {
    padding: 8px;
  }

  form label {
    font-size: 13px;
  }

  form input[type="text"],
  form input[type="password"],
  form input[type="number"],
  form textarea {
    font-size: 14px;
    padding: 8px;
  }

  .form-actions {
    flex-wrap: wrap;
  }

  .btn {
    padding: 8px 14px;
    font-size: 13px;
    min-height: 36px;
  }

  /* History table mobile */
  .history-controls {
    flex-direction: column;
    align-items: stretch;
  }

  .history-controls .range-btns {
    flex-wrap: wrap;
  }

  .history-table {
    font-size: 11px;
  }

  .history-table th,
  .history-table td {
    padding: 6px 4px;
    white-space: nowrap;
  }

  /* Overview rows */
  #overview .row {
    padding: 6px 0;
  }

  /* Error banner */
  .error-banner {
    font-size: 11px;
    padding: 6px 10px;
  }

  .empty {
    padding: 16px 8px;
    font-size: 13px;
  }
}

/* Touch-friendly buttons */
@media (hover: none) and (pointer: coarse) {
  .icon-btn {
    min-width: 36px;
    min-height: 36px;
  }

  .btn {
    min-height: 40px;
  }

  .account-select {
    min-height: 36px;
  }
}