/* style.css — IE315000 Demand Forecasting & Aggregate Planning */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:      #f1f5f9;
  --surface: #ffffff;
  --border:  #e2e8f0;
  --primary: #1e40af;
  --primary-light: #3b82f6;
  --text:    #1e293b;
  --muted:   #64748b;
  --ma:      #f59e0b;
  --es:      #10b981;
  --holt:    #8b5cf6;
  --combo:   #ef4444;
  --lp:      #1e40af;
  --level:   #0891b2;
  --chase:   #059669;
  --radius:  8px;
  --shadow:  0 1px 3px rgba(0,0,0,.10), 0 1px 2px rgba(0,0,0,.06);
}

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

/* ── Header ──────────────────────────────────────────────────────────────── */
header {
  background: var(--primary);
  color: #fff;
  padding: 14px 24px;
}
header h1 { font-size: 1.15rem; font-weight: 700; }
header p  { font-size: 0.82rem; opacity: .8; margin-top: 2px; }

/* ── Tab navigation ──────────────────────────────────────────────────────── */
.tab-nav {
  display: flex;
  gap: 0;
  background: var(--primary);
  border-bottom: 2px solid var(--primary-light);
  padding: 0 16px;
  overflow-x: auto;
}
.tab-btn {
  background: transparent;
  border: none;
  color: rgba(255,255,255,.7);
  padding: 10px 16px;
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  border-bottom: 3px solid transparent;
  transition: color .15s, border-color .15s;
}
.tab-btn:hover  { color: #fff; }
.tab-btn.active { color: #fff; border-bottom-color: #93c5fd; }

/* ── Tab content ─────────────────────────────────────────────────────────── */
.tab-content { display: none; padding: 20px; max-width: 1100px; margin: 0 auto; }
.tab-content.active { display: block; }

/* ── Cards ───────────────────────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px 20px;
  margin-bottom: 16px;
}
.card h2 { font-size: .95rem; font-weight: 700; margin-bottom: 10px; color: var(--primary); }
.card h3 { font-size: .88rem; font-weight: 600; margin-bottom: 8px; color: var(--text); }

/* ── Two-column layout ───────────────────────────────────────────────────── */
.two-col {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 16px;
  align-items: start;
}
@media (max-width: 700px) { .two-col { grid-template-columns: 1fr; } }

/* ── Three-column layout ─────────────────────────────────────────────────── */
.three-col {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 16px;
}
@media (max-width: 700px) { .three-col { grid-template-columns: 1fr; } }

/* ── Metric badges ───────────────────────────────────────────────────────── */
.metric-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
  text-align: center;
}
.metric-box .metric-label { font-size: .75rem; color: var(--muted); text-transform: uppercase; letter-spacing: .05em; }
.metric-box .metric-value { font-size: 1.4rem; font-weight: 700; color: var(--primary); margin-top: 2px; }
.metric-box .metric-sub   { font-size: .75rem; color: var(--muted); margin-top: 2px; }

/* ── Tables ──────────────────────────────────────────────────────────────── */
.tbl-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: .82rem; }
th {
  background: #f8fafc;
  color: var(--muted);
  font-weight: 600;
  text-transform: uppercase;
  font-size: .72rem;
  letter-spacing: .04em;
  padding: 8px 10px;
  border-bottom: 2px solid var(--border);
  text-align: right;
}
th:first-child { text-align: left; }
td {
  padding: 7px 10px;
  border-bottom: 1px solid var(--border);
  text-align: right;
  white-space: nowrap;
}
td:first-child { text-align: left; font-weight: 500; }
tr:hover td { background: #f8fafc; }
tr.total-row td { font-weight: 700; background: #eff6ff; border-top: 2px solid #bfdbfe; }
.tag-lp    { color: var(--lp);    font-weight: 600; }
.tag-level { color: var(--level); font-weight: 600; }
.tag-chase { color: var(--chase); font-weight: 600; }

/* ── Sliders ─────────────────────────────────────────────────────────────── */
.slider-group { margin-bottom: 12px; }
.slider-group label {
  display: flex;
  justify-content: space-between;
  font-size: .82rem;
  font-weight: 500;
  margin-bottom: 4px;
  color: var(--text);
}
.slider-group label span { font-weight: 700; color: var(--primary); }
input[type=range] {
  width: 100%;
  accent-color: var(--primary);
  cursor: pointer;
}
.section-label {
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--muted);
  margin: 12px 0 6px;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--border);
}

/* ── Strategy selector ───────────────────────────────────────────────────── */
.strategy-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.strategy-btn {
  padding: 8px 18px;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  font-size: .82rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--muted);
  transition: all .15s;
}
.strategy-btn.active-lp    { border-color: var(--lp);    color: var(--lp);    background: #eff6ff; }
.strategy-btn.active-level { border-color: var(--level); color: var(--level); background: #ecfeff; }
.strategy-btn.active-chase { border-color: var(--chase); color: var(--chase); background: #ecfdf5; }

/* ── Buttons ─────────────────────────────────────────────────────────────── */
.btn {
  display: inline-block;
  padding: 8px 20px;
  border-radius: var(--radius);
  border: none;
  font-size: .85rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity .15s;
}
.btn:hover { opacity: .85; }
.btn-primary   { background: var(--primary); color: #fff; }
.btn-secondary { background: var(--border);  color: var(--text); }

/* ── Planning input table ────────────────────────────────────────────────── */
.plan-input {
  width: 80px;
  padding: 5px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: .9rem;
  text-align: center;
}
.plan-input:focus { outline: none; border-color: var(--primary-light); }

/* ── Canvas wrapper ──────────────────────────────────────────────────────── */
.chart-wrap { position: relative; height: 280px; }

/* ── Legend dots ─────────────────────────────────────────────────────────── */
.legend { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 10px; font-size: .78rem; }
.legend-item { display: flex; align-items: center; gap: 5px; }
.dot { width: 10px; height: 10px; border-radius: 50%; }

/* ── Leaderboard form ────────────────────────────────────────────────────── */
.submit-form { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 16px; }
.submit-form input[type=text] {
  flex: 1; min-width: 180px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: .85rem;
}
.score-summary {
  display: flex; gap: 16px; flex-wrap: wrap;
  padding: 12px 16px;
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: var(--radius);
  margin-bottom: 16px;
  font-size: .85rem;
}
.score-summary b { color: var(--primary); }

/* ── Status message ──────────────────────────────────────────────────────── */
.msg { padding: 10px 14px; border-radius: var(--radius); font-size: .82rem; margin-bottom: 10px; }
.msg-info    { background: #eff6ff; color: #1e40af; border: 1px solid #bfdbfe; }
.msg-success { background: #f0fdf4; color: #166534; border: 1px solid #bbf7d0; }
.msg-error   { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }

/* ── Rank badge ──────────────────────────────────────────────────────────── */
.rank-1 { color: #b45309; font-weight: 800; }
.rank-2 { color: #6b7280; font-weight: 700; }
.rank-3 { color: #92400e; font-weight: 700; }

/* ── Info callout ────────────────────────────────────────────────────────── */
.info-box {
  padding: 10px 14px;
  background: #f8fafc;
  border-left: 4px solid var(--primary-light);
  border-radius: 0 var(--radius) var(--radius) 0;
  margin-bottom: 12px;
  font-size: .82rem;
  color: var(--muted);
}