/* ──────────────────────────────────────
   Reset & Variables
────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:       #0f1117;
  --surface:  #1a1d26;
  --surface2: #22263a;
  --border:   #2a2f45;
  --text:     #e8eaf0;
  --muted:    #7a84a0;
  --accent:   #4f8ef7;
  --green:    #2ecc71;
  --red:      #e74c3c;
  --orange:   #f5a623;
  --radius:   8px;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ──────────────────────────────────────
   Header
────────────────────────────────────── */
header {
  flex-shrink: 0;
  padding: 14px 24px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
}

header h1 {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.3px;
}

header h1 span {
  font-weight: 400;
  color: var(--muted);
  margin-left: 4px;
}

/* ──────────────────────────────────────
   Layout
────────────────────────────────────── */
main {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* ──────────────────────────────────────
   Sidebar
────────────────────────────────────── */
.sidebar {
  width: 272px;
  flex-shrink: 0;
  background: var(--surface);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 20px 16px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.sidebar h2 {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--muted);
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

/* Param groups */
.param-group {
  margin-bottom: 16px;
}

.param-group:last-child { margin-bottom: 0; }

.param-group h3 {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--accent);
  margin-bottom: 8px;
}

.param-group label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 5px;
  color: var(--muted);
  font-size: 12px;
  gap: 8px;
}

.param-group input[type="number"] {
  width: 88px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 4px 8px;
  color: var(--text);
  font-size: 12px;
  text-align: right;
  outline: none;
  transition: border-color 0.15s;
  flex-shrink: 0;
}

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

.param-group input[type="date"] {
  width: 130px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 4px 8px;
  color: var(--text);
  font-size: 12px;
  outline: none;
  transition: border-color 0.15s;
  color-scheme: dark;
}

/* Upload section */
.upload {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.hint {
  font-size: 11px;
  color: var(--muted);
  line-height: 1.5;
}

.file-label {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.file-title {
  font-size: 11px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ─── Source Tabs ─── */
.source-tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 10px;
}

.tab {
  flex: 1;
  padding: 6px 0;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.tab.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.tab:hover:not(.active) {
  border-color: var(--accent);
  color: var(--text);
}

.source-desc { margin-bottom: 10px; }

.hint.muted {
  color: var(--border);
  margin-top: 3px;
}

/* ─── Load Button ─── */
#loadBtn {
  width: 100%;
  padding: 8px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

#loadBtn:hover:not(:disabled) {
  border-color: var(--accent);
  background: rgba(79,142,247,0.1);
}

#loadBtn:disabled { opacity: 0.4; cursor: not-allowed; }

/* ─── Load Status ─── */
.load-status {
  font-size: 11px;
  min-height: 18px;
  text-align: center;
  padding: 2px 0;
}

.status-loading { color: var(--muted); }
.status-success { color: var(--green); }
.status-error   { color: var(--red);   }

#runBtn {
  margin-top: 6px;
  padding: 10px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: 0.2px;
  transition: opacity 0.15s, transform 0.1s;
}

#runBtn:hover:not(:disabled) {
  opacity: 0.88;
  transform: translateY(-1px);
}

#runBtn:active:not(:disabled) {
  transform: translateY(0);
}

#runBtn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

/* ──────────────────────────────────────
   Content
────────────────────────────────────── */
.content {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

/* ──────────────────────────────────────
   Signal Box
────────────────────────────────────── */
.signal-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
}

.signal-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.signal-title {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--muted);
}

.badge {
  font-size: 11px;
  font-weight: 700;
  padding: 2px 10px;
  border-radius: 20px;
  letter-spacing: 0.3px;
}

.badge.buy  { background: rgba(46,204,113,0.15); color: var(--green); }
.badge.sell { background: rgba(231,76,60,0.15);  color: var(--red);   }
.badge.hold { background: rgba(245,166,35,0.15); color: var(--orange);}

.signal-row {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
}

.signal-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 100px;
}

.signal-item .label {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--muted);
}

.signal-item .value {
  font-size: 16px;
  font-weight: 700;
}

/* ──────────────────────────────────────
   Metrics Row
────────────────────────────────────── */
.metrics-row {
  display: flex;
  gap: 12px;
}

.metric-card {
  flex: 1;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.metric-card .label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--muted);
}

.metric-card .value {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.5px;
}

/* ──────────────────────────────────────
   Charts
────────────────────────────────────── */
.chart-container {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}

/* ──────────────────────────────────────
   Placeholder
────────────────────────────────────── */
.placeholder {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
}

.placeholder-inner {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.placeholder-icon {
  font-size: 48px;
  opacity: 0.4;
}

.placeholder p {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
}

.hint-small {
  font-size: 11px;
  color: var(--border);
}

/* ──────────────────────────────────────
   Color Utilities
────────────────────────────────────── */
.zone-over    { color: var(--red); }
.zone-neutral { color: var(--orange); }
.zone-under   { color: var(--green); }

.action-buy  { color: var(--green);  font-weight: 800; }
.action-sell { color: var(--red);    font-weight: 800; }
.action-hold { color: var(--orange); font-weight: 800; }

.positive { color: var(--green); }
.negative { color: var(--red);   }

/* ──────────────────────────────────────
   Trade Table
────────────────────────────────────── */
.table-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.table-title {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--muted);
}

.table-count {
  font-size: 11px;
  color: var(--border);
}

.table-scroll {
  overflow-x: auto;
  overflow-y: auto;
  max-height: 420px;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

#tradeTable {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
  white-space: nowrap;
}

#tradeTable thead {
  position: sticky;
  top: 0;
  z-index: 1;
  background: var(--surface2);
}

#tradeTable th {
  padding: 8px 12px;
  text-align: right;
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
}

#tradeTable th:first-child { text-align: left; }

#tradeTable td {
  padding: 6px 12px;
  text-align: right;
  border-bottom: 1px solid rgba(42, 47, 69, 0.5);
  color: var(--text);
}

#tradeTable td:first-child { text-align: left; color: var(--muted); }

#tradeTable tbody tr:hover { background: rgba(79, 142, 247, 0.04); }

.muted-text { color: var(--border); }

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