/* ============================================================
   style.css — Energy Demand Forecasting · Static Portfolio App
   Color palette mirrors app/utils.py COLORS dict
   ============================================================ */

:root {
  --primary:    #1E3A5F;
  --accent:     #2ECC71;
  --warning:    #E74C3C;
  --sarimax:    #E74C3C;
  --tuned:      #2ECC71;
  --xgb:        #9B59B6;
  --actual:     #1E3A5F;
  --bg-card:    #F8F9FA;
  --text-muted: #6C757D;
  --border:     #DEE2E6;
  --bg:         #FFFFFF;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: #F0F2F6;
  color: #1C1C1E;
  line-height: 1.6;
}

/* ── Layout ── */
#app-shell {
  display: flex;
  min-height: 100vh;
}

/* ── Sidebar nav ── */
#sidebar {
  width: 230px;
  background: var(--primary);
  color: white;
  display: flex;
  flex-direction: column;
  padding: 0;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  overflow-y: auto;
  z-index: 100;
}

#sidebar-logo {
  padding: 24px 20px 16px;
  border-bottom: 1px solid rgba(255,255,255,0.12);
}

#sidebar-logo .logo-icon { font-size: 1.8rem; }
#sidebar-logo .logo-title {
  font-size: 0.92rem;
  font-weight: 700;
  color: white;
  line-height: 1.3;
  margin-top: 6px;
}
#sidebar-logo .logo-sub {
  font-size: 0.72rem;
  color: #90CDF4;
  margin-top: 2px;
}

#sidebar nav { padding: 16px 0; flex: 1; }

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 20px;
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 500;
  color: rgba(255,255,255,0.75);
  border-left: 3px solid transparent;
  transition: all 0.15s ease;
  user-select: none;
}
.nav-item:hover { background: rgba(255,255,255,0.08); color: white; }
.nav-item.active {
  background: rgba(46,204,113,0.15);
  color: white;
  border-left-color: var(--accent);
}
.nav-item .nav-icon { font-size: 1rem; width: 20px; text-align: center; }

/* ── Main content ── */
#main-content {
  margin-left: 230px;
  flex: 1;
  padding: 32px;
  max-width: 1200px;
}

/* ── Pages ── */
.page { display: none; }
.page.active { display: block; }

/* ── Section header ── */
.section-header {
  font-size: 1rem;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  border-bottom: 2px solid var(--accent);
  padding-bottom: 6px;
  margin: 28px 0 16px;
}

/* ── Hero ── */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, #2C5282 100%);
  padding: 40px 32px;
  border-radius: 12px;
  margin-bottom: 24px;
  color: white;
}
.hero-eyebrow {
  color: #90CDF4;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.hero h1 {
  font-size: 2.1rem;
  font-weight: 800;
  margin: 0 0 10px;
  line-height: 1.2;
}
.hero-sub {
  color: #90CDF4;
  font-size: 1.1rem;
  margin-bottom: 20px;
}
.hero-badges { display: flex; gap: 10px; flex-wrap: wrap; }
.badge {
  padding: 5px 14px;
  border-radius: 20px;
  font-size: 0.82rem;
  background: rgba(255,255,255,0.15);
  color: white;
}
.badge.green { background: rgba(46,204,113,0.3); color: #90EE90; font-weight: 700; }

/* ── Cards ── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px 20px;
}

/* ── KPI grid ── */
.kpi-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.kpi-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px;
  text-align: center;
}
.kpi-label { font-size: 0.8rem; color: var(--text-muted); font-weight: 600; margin-bottom: 6px; }
.kpi-value { font-size: 1.6rem; font-weight: 800; color: var(--primary); }
.kpi-delta { font-size: 0.78rem; color: var(--accent); margin-top: 4px; font-weight: 600; }
.kpi-delta.negative { color: var(--warning); }

/* ── Model strip ── */
.model-strip { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.model-card {
  border: 2px solid;
  border-radius: 10px;
  padding: 16px;
  text-align: center;
  height: 140px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
}
.model-card .model-label { font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; }
.model-card .model-name  { font-size: 1rem; font-weight: 700; color: #1E3A5F; }
.model-card .model-metric1 { font-size: 0.85rem; color: #2C3E50; }
.model-card .model-metric2 { font-size: 0.82rem; color: var(--text-muted); }

/* ── Insight cards ── */
.insight-card {
  border-radius: 8px;
  padding: 14px 18px;
  margin: 16px 0;
  font-size: 0.92rem;
  line-height: 1.6;
}
.insight-card.green  { background: #F0FFF4; border-left: 4px solid var(--accent); }
.insight-card.amber  { background: #FFFBEB; border-left: 4px solid #F59E0B; }
.insight-card.red    { background: #FFF5F5; border-left: 4px solid var(--warning); }
.insight-card.blue   { background: #EBF8FF; border-left: 4px solid #3182CE; }

/* ── Tech stack grid ── */
.tech-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.tech-badge {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.tech-badge .tech-icon { font-size: 1.3rem; }
.tech-badge .tech-name { font-weight: 700; font-size: 0.83rem; color: var(--primary); }
.tech-badge .tech-desc { font-size: 0.7rem; color: var(--text-muted); }

/* ── Tabs ── */
.tabs-nav {
  display: flex;
  border-bottom: 2px solid var(--border);
  margin-bottom: 20px;
  gap: 0;
}
.tab-btn {
  padding: 10px 20px;
  border: none;
  background: none;
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-muted);
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all 0.15s;
}
.tab-btn:hover { color: var(--primary); }
.tab-btn.active { color: var(--primary); border-bottom-color: var(--accent); }
.tab-pane { display: none; }
.tab-pane.active { display: block; }

/* ── Slider ── */
.slider-wrap { margin: 16px 0; }
.slider-wrap label { font-size: 0.88rem; font-weight: 600; color: var(--primary); display: block; margin-bottom: 8px; }
input[type=range] {
  width: 100%;
  accent-color: var(--accent);
}

/* ── Metrics row ── */
.metrics-row { display: flex; gap: 12px; flex-wrap: wrap; margin: 12px 0; }
.metric-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  flex: 1;
  min-width: 120px;
}
.metric-box .m-label { font-size: 0.75rem; color: var(--text-muted); font-weight: 600; margin-bottom: 4px; }
.metric-box .m-value { font-size: 1.15rem; font-weight: 800; color: var(--primary); }

/* ── Table ── */
.results-table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
.results-table th {
  background: var(--primary);
  color: white;
  padding: 10px 14px;
  text-align: left;
  font-weight: 600;
}
.results-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
}
.results-table tr:nth-child(even) td { background: #F8F9FA; }
.results-table tr.winner-row td { background: #F0FFF4; font-weight: 700; }
.winner-badge {
  background: var(--accent);
  color: white;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 12px;
  margin-left: 6px;
}

/* ── Radio group ── */
.radio-group { display: flex; gap: 12px; flex-wrap: wrap; margin: 12px 0; }
.radio-group label {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  font-size: 0.88rem;
  padding: 7px 14px;
  border: 1px solid var(--border);
  border-radius: 20px;
  transition: all 0.15s;
}
.radio-group label:hover { border-color: var(--accent); }
.radio-group input[type=radio] { accent-color: var(--accent); }
.radio-group input[type=radio]:checked + span { font-weight: 700; color: var(--primary); }

/* ── EDA figure gallery ── */
.figure-gallery { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.figure-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}
.figure-card img { width: 100%; display: block; }
.figure-caption {
  padding: 10px 14px;
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.5;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
}

/* ── EDA section headings ── */
.eda-section { margin-bottom: 32px; }

/* ── Methodology ── */
.pipeline-row {
  display: flex;
  gap: 0;
  align-items: stretch;
  margin: 16px 0;
  flex-wrap: wrap;
}
.pipeline-step {
  flex: 1;
  min-width: 120px;
  padding: 12px 10px;
  text-align: center;
  font-size: 0.8rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  margin: 4px;
  background: var(--bg-card);
}
.pipeline-step .ps-icon { font-size: 1.4rem; margin-bottom: 6px; }
.pipeline-step .ps-label { font-weight: 600; color: var(--primary); font-size: 0.78rem; }
.pipeline-step .ps-sub { color: var(--text-muted); font-size: 0.7rem; margin-top: 3px; }
.pipeline-step.winner { background: #F0FFF4; border-color: var(--accent); }

.phase-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 16px 0; }
.phase-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
}
.phase-num { font-size: 0.7rem; font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; }
.phase-title { font-size: 0.92rem; font-weight: 700; color: var(--primary); margin: 4px 0; }
.phase-body { font-size: 0.78rem; color: #2C3E50; line-height: 1.5; }

.lesson-card {
  border-radius: 8px;
  padding: 14px 18px;
  margin: 12px 0;
  border-left: 4px solid;
  font-size: 0.88rem;
  line-height: 1.6;
}
.lesson-card.amber  { background: #FFFBEB; border-color: #F59E0B; }
.lesson-card.red    { background: #FFF5F5; border-color: var(--warning); }
.lesson-card.green  { background: #F0FFF4; border-color: var(--accent); }
.lesson-card .lesson-num { font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; color: var(--text-muted); margin-bottom: 4px; }
.lesson-card .lesson-title { font-weight: 700; margin-bottom: 6px; color: var(--primary); }

/* ── Dataset expander ── */
details summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--primary);
  padding: 10px 0;
  user-select: none;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
}
details summary::before { content: "▶"; font-size: 0.7rem; transition: transform 0.2s; }
details[open] summary::before { transform: rotate(90deg); }
.dataset-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; padding: 12px 0; }
.dataset-col { font-size: 0.82rem; line-height: 1.7; }
.dataset-col strong { display: block; color: var(--primary); font-size: 0.85rem; margin-bottom: 4px; }

/* ── Reusable grid helpers ── */
/* Used in place of inline grid styles so media queries can override them. */
.chart-pair-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 20px 0;
}
.card-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}
/* Prevents wide tables from overflowing on narrow screens */
.table-scroll-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }

/* ── Mobile nav (hidden on desktop) ── */
#mobile-header {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 52px;
  background: var(--primary);
  color: white;
  align-items: center;
  padding: 0 16px;
  gap: 14px;
  z-index: 200;
  box-shadow: 0 2px 8px rgba(0,0,0,0.25);
}
#mobile-nav-toggle {
  background: none;
  border: none;
  color: white;
  font-size: 1.5rem;
  cursor: pointer;
  line-height: 1;
  padding: 2px 6px;
}
#mobile-header .mobile-title {
  font-size: 0.9rem;
  font-weight: 700;
}
/* Semi-transparent backdrop that closes the sidebar on tap */
#sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.45);
  z-index: 99;
}

/* ── Responsive ── */
@media (max-width: 900px) {
  #sidebar { width: 60px; }
  #sidebar-logo .logo-title,
  #sidebar-logo .logo-sub,
  .nav-item span { display: none; }
  #main-content { margin-left: 60px; padding: 20px; }
  .kpi-grid { grid-template-columns: repeat(2, 1fr); }
  .model-strip { grid-template-columns: 1fr; }
  .figure-gallery { grid-template-columns: 1fr; }
  .phase-grid { grid-template-columns: 1fr; }
}

/* Smartphone breakpoint */
@media (max-width: 640px) {
  /* Show fixed top bar with hamburger */
  #mobile-header { display: flex; }

  /* Sidebar: hidden off-screen by default, slides in when body.sidebar-open */
  #sidebar {
    width: 230px;
    transform: translateX(-230px);
    transition: transform 0.25s ease;
  }
  body.sidebar-open #sidebar { transform: translateX(0); }
  /* Restore text labels when the sidebar is open */
  body.sidebar-open #sidebar .logo-title,
  body.sidebar-open #sidebar .logo-sub,
  body.sidebar-open #sidebar .nav-item span { display: block !important; }
  body.sidebar-open #sidebar-overlay { display: block; }

  /* Main content: full-width with room for top bar */
  #main-content { margin-left: 0; padding: 16px; padding-top: 68px; overflow-x: hidden; }

  /* Chart containers: constrain to viewport width so Plotly responsive scaling works */
  #chart-rmse, #chart-mae, #chart-mape,
  #chart-forecast, #chart-explorer,
  #chart-resid-time, #chart-resid-hist {
    width: 100% !important;
    min-width: 0;
  }

  /* Hero */
  .hero { padding: 24px 16px; }
  .hero h1 { font-size: 1.5rem; }
  .hero-sub { font-size: 0.95rem; }

  /* Grids */
  .chart-pair-grid { grid-template-columns: 1fr; }
  .card-grid-2 { grid-template-columns: 1fr; }
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
  .dataset-grid { grid-template-columns: 1fr; }
  .kpi-grid { grid-template-columns: 1fr 1fr; }

  /* Tabs: scroll horizontally so labels don't wrap or overflow */
  .tabs-nav { overflow-x: auto; flex-wrap: nowrap; -webkit-overflow-scrolling: touch; }
  .tab-btn { padding: 10px 11px; font-size: 0.8rem; white-space: nowrap; }

  /* Reduce chart heights to preserve aspect ratio on narrow screens */
  #chart-forecast { height: 280px !important; }
  #chart-explorer { height: 320px !important; }
  #chart-resid-time, #chart-resid-hist { height: 240px !important; }

  .section-header { font-size: 0.88rem; letter-spacing: 1px; }
}

/* Very narrow phones (320–380 px) */
@media (max-width: 380px) {
  .kpi-grid { grid-template-columns: 1fr; }
  .tech-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 1.3rem; }
}