:root {
  /* Light theme (default) */
  --bg: #f4f5f7;
  --panel: #ffffff;
  --panel-alt: #eef0f3;
  --border: #dbdfe6;
  --text: #1b2027;
  --text-dim: #667085;
  --accent: #b8600f;
  --accent-2: #2f6fa8;
  --danger: #c0392b;
  --good: #2e7d32;
  --row-hover: rgba(0, 0, 0, 0.035);
  --row-border: rgba(0, 0, 0, 0.06);
  --scrim: rgba(0, 0, 0, 0.4);
  --accent-ink: #fff8f0;
  --chart-grid: rgba(0, 0, 0, 0.10);
  --chart-zero: rgba(0, 0, 0, 0.30);
  --mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  --sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #12161c;
    --panel: #1a2029;
    --panel-alt: #202836;
    --border: #2b3444;
    --text: #e7ebf0;
    --text-dim: #93a0b4;
    --accent: #d98324;
    --accent-2: #4f9fd6;
    --danger: #d9534f;
    --good: #5cb85c;
    --row-hover: rgba(255, 255, 255, 0.03);
    --row-border: rgba(255, 255, 255, 0.04);
    --scrim: rgba(0, 0, 0, 0.5);
    --accent-ink: #1a1207;
    --chart-grid: rgba(255, 255, 255, 0.08);
    --chart-zero: rgba(255, 255, 255, 0.25);
  }
}

:root[data-theme="dark"] {
  --bg: #12161c;
  --panel: #1a2029;
  --panel-alt: #202836;
  --border: #2b3444;
  --text: #e7ebf0;
  --text-dim: #93a0b4;
  --accent: #d98324;
  --accent-2: #4f9fd6;
  --danger: #d9534f;
  --good: #5cb85c;
  --row-hover: rgba(255, 255, 255, 0.03);
  --row-border: rgba(255, 255, 255, 0.04);
  --scrim: rgba(0, 0, 0, 0.5);
  --accent-ink: #1a1207;
  --chart-grid: rgba(255, 255, 255, 0.08);
  --chart-zero: rgba(255, 255, 255, 0.25);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 14px;
}

body { transition: background-color .15s ease, color .15s ease; }

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

a { color: var(--accent-2); }

/* ---------- Theme toggle ---------- */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  font-size: 12px;
}
.theme-toggle .sun, .theme-toggle .moon { display: none; }
:root:not([data-theme="dark"]) .theme-toggle .sun { display: inline; }
:root[data-theme="dark"] .theme-toggle .moon { display: inline; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]):not([data-theme="dark"]) .theme-toggle .sun { display: none; }
  :root:not([data-theme="light"]):not([data-theme="dark"]) .theme-toggle .moon { display: inline; }
}
#loginScreen > .theme-toggle {
  position: absolute;
  top: 16px;
  right: 16px;
}

/* ---------- Login ---------- */
#loginScreen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.login-box {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 32px;
  width: 320px;
  text-align: center;
}
.login-box h1 {
  font-size: 18px;
  margin: 0 0 4px;
}
.login-box p {
  color: var(--text-dim);
  font-size: 12px;
  margin: 0 0 20px;
}
.login-box input {
  width: 100%;
  padding: 10px 12px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--panel-alt);
  margin-bottom: 12px;
}
.login-box button {
  width: 100%;
  padding: 10px 12px;
}
.login-error {
  color: var(--danger);
  font-size: 12px;
  min-height: 16px;
  margin-bottom: 8px;
}

/* ---------- Layout ---------- */
#app { display: none; min-height: 100vh; grid-template-columns: 280px 1fr; }
#app.visible { display: grid; }

#sidebar {
  background: var(--panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  height: 100vh;
  position: sticky;
  top: 0;
}
#sidebar header {
  padding: 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
#sidebar header h1 { font-size: 15px; margin: 0; }
#sidebar header .header-actions { display: flex; align-items: center; gap: 6px; }
#sidebar header .icon-btn { font-size: 12px; }
.qr-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 33px;
  height: 33px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--panel-alt);
  text-decoration: none;
  font-size: 15px;
}
.qr-link:hover { border-color: var(--accent-2); }

#roundList { flex: 1; overflow-y: auto; padding: 8px; }
.round-item {
  padding: 10px 12px;
  border-radius: 8px;
  cursor: pointer;
  margin-bottom: 4px;
  border: 1px solid transparent;
}
.round-item:hover { background: var(--panel-alt); }
.round-item.active { background: var(--panel-alt); border-color: var(--accent); }
.round-item .rname { font-weight: 600; font-size: 13px; }
.round-item .rsub { color: var(--text-dim); font-size: 11px; margin-top: 2px; }

#sidebar footer {
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  font-size: 11px;
  color: var(--text-dim);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

#main { padding: 20px 28px 60px; overflow-y: auto; height: 100vh; }

.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
  flex-wrap: wrap;
  gap: 10px;
}
.toolbar h2 {
  margin: 0;
  font-size: 18px;
}
.toolbar .actions { display: flex; gap: 8px; flex-wrap: wrap; }

button {
  background: var(--panel-alt);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 14px;
  border-radius: 6px;
  cursor: pointer;
}
button:hover { border-color: var(--accent-2); }
button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); font-weight: 600; }
button.primary:hover { filter: brightness(1.08); }
button.danger { color: var(--danger); }
button.danger:hover { border-color: var(--danger); }
button:disabled { opacity: 0.5; cursor: not-allowed; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
}

fieldset {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  margin: 0 0 18px;
}
legend {
  padding: 0 8px;
  color: var(--text-dim);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

label {
  display: block;
  font-size: 12px;
  color: var(--text-dim);
  margin-bottom: 4px;
}
.field { margin-bottom: 4px; }
.field input, .field select {
  width: 100%;
  padding: 8px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--panel-alt);
}
.field input:focus, .field select:focus { outline: none; border-color: var(--accent-2); }
.field .hint { font-size: 10px; color: var(--text-dim); margin-top: 2px; }

.field.wide { grid-column: 1 / -1; }

/* ---------- Results ---------- */
#resultsPanel { margin-top: 20px; }
.stat-row {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.stat {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 16px;
  min-width: 120px;
}
.stat .label { font-size: 10px; color: var(--text-dim); text-transform: uppercase; letter-spacing: .05em; }
.stat .value { font-size: 18px; font-weight: 600; font-family: var(--mono); }

.chart-tabs { display: flex; gap: 6px; margin-bottom: 8px; }
.chart-tabs button { padding: 6px 12px; font-size: 12px; }
.chart-tabs button.active { border-color: var(--accent); color: var(--accent); }

#chartWrap {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  margin-bottom: 20px;
}
canvas#chart { width: 100%; height: 320px; display: block; }

.table-wrap {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: auto;
  max-height: 520px;
}
table { border-collapse: collapse; width: 100%; font-size: 12px; font-family: var(--mono); white-space: nowrap; }
thead th {
  position: sticky; top: 0;
  background: var(--panel-alt);
  padding: 8px 10px;
  text-align: right;
  border-bottom: 1px solid var(--border);
  font-family: var(--sans);
  font-size: 11px;
  color: var(--text-dim);
}
thead th:first-child, tbody td:first-child { text-align: left; }
tbody td { padding: 6px 10px; text-align: right; border-bottom: 1px solid var(--row-border); }
tbody tr:hover { background: var(--row-hover); }
tbody tr.zero-row { color: var(--good); }

.empty-state {
  color: var(--text-dim);
  text-align: center;
  padding: 60px 20px;
}
.empty-state h3 { color: var(--text); margin-bottom: 6px; }

.toast {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: var(--panel-alt);
  border: 1px solid var(--border);
  padding: 10px 16px;
  border-radius: 8px;
  font-size: 13px;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity .2s, transform .2s;
  pointer-events: none;
  z-index: 50;
}
.toast.show { opacity: 1; transform: translateY(0); }
.toast.error { border-color: var(--danger); color: var(--danger); }

#confirmModal {
  display: none;
  position: fixed; inset: 0;
  background: var(--scrim);
  align-items: center; justify-content: center;
  z-index: 60;
}
#confirmModal.show { display: flex; }
.modal-box {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  width: 380px;
  max-width: 90vw;
}
.modal-box p { margin: 0 0 16px; line-height: 1.5; }
.modal-actions { display: flex; justify-content: flex-end; gap: 8px; }

@media (max-width: 800px) {
  #app.visible { grid-template-columns: 1fr; }
  #sidebar { height: auto; position: static; border-right: none; border-bottom: 1px solid var(--border); }
  #main { height: auto; }
}