/* ── CSS custom properties ── */
:root {
  --bg:        #0f172a;
  --surface:   #1e293b;
  --surface2:  #273449;
  --border:    #334155;
  --text:      #e2e8f0;
  --muted:     #94a3b8;
  --accent:    #14b8a6;
  --accent-dk: #0d9488;
  --red:       #ef4444;
  --green:     #22c55e;
  --font:      -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.5;
}

/* ── Lock screen ── */
#lock-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 1rem;
}

.lock-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2.5rem 2rem;
  width: 100%;
  max-width: 380px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}

.lock-card h1 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.5px;
}

.lock-card p {
  color: var(--muted);
  margin-top: 0.25rem;
  font-size: 0.875rem;
}

.lock-card .divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 1.5rem 0;
}

.input-wrap {
  position: relative;
  margin-bottom: 0.75rem;
}

.input-wrap input {
  width: 100%;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.625rem 2.5rem 0.625rem 0.75rem;
  color: var(--text);
  font-size: 0.875rem;
  font-family: monospace;
  outline: none;
  transition: border-color 0.15s;
}

.input-wrap input:focus { border-color: var(--accent); }

.toggle-pw {
  position: absolute;
  right: 0.625rem;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  cursor: pointer;
  color: var(--muted);
  font-size: 0.75rem;
  padding: 0.25rem;
}
.toggle-pw:hover { color: var(--text); }

.btn-primary {
  display: block;
  width: 100%;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 0.625rem 1rem;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}
.btn-primary:hover { background: var(--accent-dk); }

.error-msg {
  color: var(--red);
  font-size: 0.8125rem;
  margin-top: 0.5rem;
  min-height: 1.2em;
}

/* ── Main app ── */
#app { display: flex; flex-direction: column; min-height: 100vh; }

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.875rem 1.5rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

header h1 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.3px;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.key-badge {
  font-family: monospace;
  font-size: 0.75rem;
  color: var(--muted);
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.2rem 0.5rem;
}

.btn-secondary {
  background: none;
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 6px;
  padding: 0.25rem 0.625rem;
  font-size: 0.75rem;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}
.btn-secondary:hover { color: var(--text); border-color: var(--text); }

/* ── Nav ── */
nav {
  display: flex;
  gap: 0;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  overflow-x: auto;
}

.nav-tab {
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--muted);
  padding: 0.625rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
  white-space: nowrap;
}
.nav-tab:hover { color: var(--text); }
.nav-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ── Content ── */
.content {
  flex: 1;
  padding: 1.5rem;
  overflow-y: auto;
}

.view { display: none; }
.view.active { display: block; }

.view-heading {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.view-meta {
  font-size: 0.8125rem;
  color: var(--muted);
  margin-bottom: 1.25rem;
}

/* ── Tables ── */
.table-wrap { overflow-x: auto; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8125rem;
}

th {
  text-align: left;
  padding: 0.5rem 0.75rem;
  color: var(--muted);
  font-weight: 600;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

td {
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border);
}

tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--surface2); }

.signal-pos { color: var(--green); font-weight: 600; }
.signal-neg { color: var(--red);   font-weight: 600; }
.val-neg    { color: var(--red); }

/* ── Universe chips ── */
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.chip-label {
  font-size: 0.75rem;
  color: var(--muted);
  font-weight: 600;
  align-self: center;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.chip {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.25rem 0.625rem;
  font-size: 0.8125rem;
  font-family: monospace;
  color: var(--text);
}

.chip.special {
  border-color: var(--accent);
  color: var(--accent);
}

.universe-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* ── Advanced view ── */
.adv-controls {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

select {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 0.5rem 0.75rem;
  font-size: 0.875rem;
  outline: none;
  cursor: pointer;
}
select:focus { border-color: var(--accent); }

.btn-sm {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}
.btn-sm:hover { background: var(--accent-dk); }

.row-count {
  font-size: 0.8125rem;
  color: var(--muted);
  margin-bottom: 0.75rem;
}

/* ── Empty / error states ── */
.empty-state {
  color: var(--muted);
  font-size: 0.875rem;
  padding: 2rem 0;
}

/* ── Spinner ── */
.spinner {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  vertical-align: middle;
  margin-right: 0.5rem;
}
@keyframes spin { to { transform: rotate(360deg); } }

.loading-row {
  display: flex;
  align-items: center;
  color: var(--muted);
  font-size: 0.875rem;
  padding: 1.5rem 0;
}

/* ── View toolbar ── */
.view-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.toolbar-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* ── Backtest form ── */
.backtest-form {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  margin-bottom: 1.25rem;
}

.form-row {
  display: flex;
  align-items: flex-end;
  gap: 1rem;
  flex-wrap: wrap;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.form-group label {
  font-size: 0.75rem;
  color: var(--muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.form-group input[type="date"] {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 0.5rem 0.75rem;
  font-size: 0.875rem;
  outline: none;
  color-scheme: dark;
}

.form-group input[type="date"]:focus { border-color: var(--accent); }

.success-msg {
  color: var(--green);
  font-size: 0.8125rem;
  margin-top: 0.5rem;
}

/* ── Hidden utility ── */
.hidden { display: none !important; }