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

:root {
  --bg:           #070d1f;
  --bg-surface:   #0d1733;
  --bg-card:      #111c35;
  --bg-hover:     #16213f;
  --bg-input:     #0a1228;
  --border:       #1a2952;
  --border-hi:    #243866;
  --blue:         #3b82f6;
  --blue-light:   #60a5fa;
  --blue-dim:     rgba(59,130,246,0.12);
  --purple:       #8b5cf6;
  --purple-light: #a78bfa;
  --purple-dim:   rgba(139,92,246,0.12);
  --gradient:     linear-gradient(135deg, #3b82f6, #8b5cf6);
  --text:         #e2e8f0;
  --text-muted:   #64748b;
  --text-dim:     #334155;
  --success:      #10b981;
  --warning:      #f59e0b;
  --danger:       #ef4444;
  --sidebar-w:    228px;
  --radius:       8px;
  --radius-lg:    12px;
  --shadow:       0 4px 24px rgba(0,0,0,0.5);
}

/* ── Base ───────────────────────────────────────────────────────────────────── */
html { color-scheme: dark; }
body {
  font-family: Inter, system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--blue-light); text-decoration: none; }
a:hover { color: var(--purple-light); }

/* ── Layout ─────────────────────────────────────────────────────────────────── */
.layout { display: flex; min-height: 100vh; }

/* ── Sidebar ────────────────────────────────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-w);
  min-height: 100vh;
  background: var(--bg-surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 100;
}

.sidebar-brand {
  padding: 1.5rem 1.25rem 1.25rem;
  border-bottom: 1px solid var(--border);
}
.sidebar-brand .brand-name {
  font-size: 1rem;
  font-weight: 700;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.3px;
}
.sidebar-brand .brand-sub {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.sidebar-nav { flex: 1; padding: 0.75rem 0; }

.nav-section {
  padding: 0.5rem 1rem 0.25rem;
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--text-dim);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.55rem 1rem;
  margin: 0.1rem 0.5rem;
  color: var(--text-muted);
  border-radius: var(--radius);
  font-size: 0.8rem;
  font-weight: 500;
  transition: background 0.15s, color 0.15s;
  cursor: pointer;
}
.nav-link:hover { background: var(--bg-hover); color: var(--text); }
.nav-link.active {
  background: var(--blue-dim);
  color: var(--blue-light);
}
.nav-link .icon { width: 16px; height: 16px; flex-shrink: 0; opacity: 0.8; }
.nav-link.active .icon { opacity: 1; }

.sidebar-footer {
  padding: 1rem;
  border-top: 1px solid var(--border);
}
.sidebar-user {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  margin-bottom: 0.625rem;
}
.user-avatar {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--gradient);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.7rem; font-weight: 700; color: #fff;
  flex-shrink: 0;
}
.user-name { font-size: 0.8rem; font-weight: 500; color: var(--text); }

.btn-logout {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.45rem 0.75rem;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.15s;
}
.btn-logout:hover { border-color: var(--danger); color: var(--danger); }

/* ── Main content ───────────────────────────────────────────────────────────── */
.main {
  margin-left: var(--sidebar-w);
  flex: 1;
  padding: 2rem 2.25rem;
  min-height: 100vh;
  overflow-x: hidden;
}

.page-header {
  margin-bottom: 1.75rem;
}
.page-header h1 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.4px;
}
.page-header p {
  color: var(--text-muted);
  font-size: 0.8rem;
  margin-top: 0.25rem;
}

/* ── Cards ──────────────────────────────────────────────────────────────────── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  margin-bottom: 1.25rem;
}
.card-title {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 1rem;
}

/* ── Stat cards ─────────────────────────────────────────────────────────────── */
.stats-row { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 1rem; margin-bottom: 1.25rem; }
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.1rem 1.25rem;
  position: relative;
  overflow: hidden;
}
.stat-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--gradient);
}
.stat-label { font-size: 0.7rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.06em; }
.stat-value { font-size: 1.6rem; font-weight: 700; color: var(--text); margin: 0.25rem 0; letter-spacing: -0.5px; }
.stat-sub { font-size: 0.7rem; color: var(--text-muted); }
.stat-good  { color: var(--success); }
.stat-warn  { color: var(--warning); }
.stat-bad   { color: var(--danger); }

/* ── Two-column grid ────────────────────────────────────────────────────────── */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; margin-bottom: 1.25rem; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 1.25rem; margin-bottom: 1.25rem; }
@media (max-width: 1100px) { .grid-2, .grid-3 { grid-template-columns: 1fr; } }

/* ── Plotly chart container ─────────────────────────────────────────────────── */
.chart-wrap { width: 100%; min-height: 320px; }

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

table.dt-table {
  width: 100% !important;
  border-collapse: collapse;
  font-size: 0.78rem;
}
table.dt-table thead th {
  background: var(--bg-surface) !important;
  color: var(--text-muted) !important;
  font-weight: 600;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border) !important;
  padding: 0.625rem 0.875rem !important;
  white-space: nowrap;
}
table.dt-table tbody tr { border-bottom: 1px solid var(--border); transition: background 0.1s; }
table.dt-table tbody tr:last-child { border-bottom: none; }
table.dt-table tbody tr:hover { background: var(--bg-hover) !important; }
table.dt-table tbody td { padding: 0.55rem 0.875rem !important; color: var(--text); }

/* DataTables overrides */
div.dataTables_wrapper { color: var(--text); }
div.dataTables_filter input,
div.dataTables_length select {
  background: var(--bg-input) !important;
  border: 1px solid var(--border) !important;
  color: var(--text) !important;
  border-radius: var(--radius) !important;
  padding: 0.3rem 0.6rem !important;
  font-size: 0.78rem;
}
div.dataTables_filter input:focus,
div.dataTables_length select:focus {
  outline: none;
  border-color: var(--blue) !important;
  box-shadow: 0 0 0 2px rgba(59,130,246,0.2) !important;
}
div.dataTables_info, div.dataTables_paginate { color: var(--text-muted) !important; font-size: 0.75rem; }
.paginate_button {
  background: var(--bg-input) !important;
  border: 1px solid var(--border) !important;
  color: var(--text-muted) !important;
  border-radius: var(--radius) !important;
  padding: 0.25rem 0.6rem !important;
  margin: 0 2px !important;
  cursor: pointer;
  font-size: 0.75rem;
}
.paginate_button:hover { background: var(--bg-hover) !important; color: var(--text) !important; border-color: var(--border-hi) !important; }
.paginate_button.current { background: var(--blue-dim) !important; color: var(--blue-light) !important; border-color: var(--blue) !important; }
.paginate_button.disabled { opacity: 0.35 !important; cursor: not-allowed !important; }

/* ── Badge / pill ───────────────────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  font-size: 0.68rem;
  font-weight: 600;
}
.badge-blue   { background: var(--blue-dim);   color: var(--blue-light); }
.badge-purple { background: var(--purple-dim); color: var(--purple-light); }
.badge-green  { background: rgba(16,185,129,0.12); color: var(--success); }
.badge-red    { background: rgba(239,68,68,0.12);  color: var(--danger); }
.badge-gray   { background: rgba(100,116,139,0.12); color: var(--text-muted); }

/* ── Feature importance tab switcher ────────────────────────────────────────── */
.tab-switcher {
  display: flex;
  gap: 0.25rem;
  margin-bottom: 1rem;
}
.tab-btn {
  padding: 0.4rem 1rem;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  border-radius: var(--radius);
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
}
.tab-btn:hover { background: var(--bg-hover); color: var(--text); }
.tab-btn.active { background: var(--blue-dim); border-color: var(--blue); color: var(--blue-light); }

/* ── Form controls ──────────────────────────────────────────────────────────── */
.form-group { margin-bottom: 1rem; }
.form-label { display: block; font-size: 0.75rem; font-weight: 500; color: var(--text-muted); margin-bottom: 0.375rem; }
.form-select, .form-input {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.55rem 0.875rem;
  border-radius: var(--radius);
  font-size: 0.8rem;
  transition: border-color 0.15s, box-shadow 0.15s;
  appearance: none;
  -webkit-appearance: none;
}
.form-select:focus, .form-input:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(59,130,246,0.15);
}
.select-wrapper { position: relative; }
.select-wrapper::after {
  content: "▾";
  position: absolute;
  right: 0.875rem;
  top: 50%; transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
  font-size: 0.75rem;
}

/* ── Predictions ────────────────────────────────────────────────────────────── */
.pred-selectors { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-bottom: 1.25rem; }
#pred-loading { color: var(--text-muted); font-size: 0.8rem; display: none; }
#pred-metrics { display: none; }

/* ── Login page ─────────────────────────────────────────────────────────────── */
.login-page {
  min-height: 100vh;
  background: var(--bg);
  background-image:
    radial-gradient(ellipse at 20% 60%, rgba(59,130,246,0.07) 0%, transparent 55%),
    radial-gradient(ellipse at 80% 20%, rgba(139,92,246,0.07) 0%, transparent 55%);
  display: flex;
  align-items: center;
  justify-content: center;
}
.login-card {
  width: 360px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: 0 0 80px rgba(59,130,246,0.07);
}
.login-logo {
  text-align: center;
  margin-bottom: 1.75rem;
}
.login-logo .logo-mark {
  width: 44px; height: 44px;
  border-radius: 12px;
  background: var(--gradient);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}
.login-logo h1 { font-size: 1.1rem; font-weight: 700; color: var(--text); }
.login-logo p  { font-size: 0.75rem; color: var(--text-muted); margin-top: 0.2rem; }

.login-input {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.65rem 0.875rem;
  border-radius: var(--radius);
  font-size: 0.85rem;
  margin-bottom: 0.75rem;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.login-input:focus { outline: none; border-color: var(--blue); box-shadow: 0 0 0 3px rgba(59,130,246,0.15); }
.login-input::placeholder { color: var(--text-dim); }

.btn-login {
  width: 100%;
  padding: 0.65rem;
  background: var(--gradient);
  border: none;
  border-radius: var(--radius);
  color: #fff;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  letter-spacing: 0.01em;
  transition: opacity 0.15s, transform 0.1s;
  margin-top: 0.5rem;
}
.btn-login:hover  { opacity: 0.9; }
.btn-login:active { transform: scale(0.99); }

.login-error {
  background: rgba(239,68,68,0.1);
  border: 1px solid rgba(239,68,68,0.3);
  color: var(--danger);
  padding: 0.55rem 0.875rem;
  border-radius: var(--radius);
  font-size: 0.78rem;
  margin-bottom: 1rem;
}

/* ── Divider ────────────────────────────────────────────────────────────────── */
.divider { border: none; border-top: 1px solid var(--border); margin: 1.25rem 0; }

/* ── Scrollbar ──────────────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border-hi); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-dim); }

/* ── Loader spinner ─────────────────────────────────────────────────────────── */
.spinner {
  width: 20px; height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--blue);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  display: inline-block;
  vertical-align: middle;
  margin-right: 0.5rem;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── HPO best params display ────────────────────────────────────────────────── */
.params-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 0.75rem;
}
.param-item {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.625rem 0.875rem;
}
.param-item .param-k { font-size: 0.68rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; }
.param-item .param-v { font-size: 1rem; font-weight: 700; color: var(--blue-light); margin-top: 0.2rem; }

/* ── WMAPE colour helpers ───────────────────────────────────────────────────── */
.wmape-cell { font-weight: 600; font-variant-numeric: tabular-nums; }
.wmape-good { color: var(--success); }
.wmape-ok   { color: var(--warning); }
.wmape-bad  { color: var(--danger); }

/* ── Top-5 run cards (predictions page) ────────────────────────────────────── */
.top-runs-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}
@media (max-width: 1200px) { .top-runs-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 800px)  { .top-runs-grid { grid-template-columns: repeat(2, 1fr); } }

.top-run-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-hi);
  border-radius: var(--radius-lg);
  padding: 1.1rem 1.1rem 0.9rem;
  cursor: pointer;
  transition: border-color 0.15s, box-shadow 0.15s, transform 0.12s;
  position: relative;
  overflow: hidden;
  user-select: none;
  box-shadow: 0 2px 12px rgba(0,0,0,0.35);
}
.top-run-card::after {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--border-hi);
  transition: background 0.15s;
}
.top-run-card--best::after { background: var(--gradient); }
.top-run-card:hover {
  border-color: var(--blue);
  box-shadow: 0 4px 24px rgba(59,130,246,0.18);
  transform: translateY(-2px);
}
.top-run-card:hover::after { background: var(--gradient); }
.top-run-card.active {
  border-color: var(--blue);
  background: rgba(59,130,246,0.08);
  box-shadow: 0 0 0 2px rgba(59,130,246,0.25), 0 4px 20px rgba(59,130,246,0.12);
}
.top-run-card.active::after { background: var(--gradient); }

/* card internals */
.trc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}
.trc-rank {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
}
.top-run-card--best .trc-rank { color: var(--blue-light); font-size: 1rem; }
.trc-label {
  font-size: 0.62rem;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.trc-wmape {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.05em;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  margin-bottom: 0.4rem;
}

.trc-name {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.trc-params {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.trc-params span {
  font-size: 0.62rem;
  color: var(--text-dim);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.1rem 0.4rem;
  font-variant-numeric: tabular-nums;
}

/* ── Combo analysis rows ────────────────────────────────────────────────────── */
.combo-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 0.625rem;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.1s;
  font-size: 0.78rem;
}
.combo-row:hover { background: var(--bg-hover); }
.combo-id   { flex: 1; font-family: monospace; color: var(--text); font-size: 0.72rem; }
.combo-meta { color: var(--text-dim); font-size: 0.66rem; white-space: nowrap; }

/* ── Reload button ──────────────────────────────────────────────────────────── */
.btn-reload {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.45rem 0.75rem;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.15s;
  margin-bottom: 0.5rem;
}
.btn-reload:hover { border-color: var(--blue); color: var(--blue-light); }
.btn-reload.loading { opacity: 0.6; cursor: wait; }
.btn-reload.done    { border-color: var(--success); color: var(--success); }