/* ── Olist Forecast Tool ─────────────────────────────────────────────── */

:root {
  --color-navy: #1a2e4a;
  --color-navy-dark: #0f1d30;
  --color-bg: #ffffff;
  --color-bg-alt: #f8f7f4;
  --color-text: #333333;
  --color-text-muted: #666666;
  --color-border: #e0dbd4;
  --color-teal: #2a9d8f;
  --color-gold: #e9a820;
  --color-green: #2e7d32;
  --color-red: #c62828;
  --font-heading: 'Merriweather', Georgia, serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --radius: 8px;
  --shadow: 0 2px 12px rgba(26, 46, 74, 0.08);
  --transition: 0.25s ease;
  --nav-height: 64px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
a { text-decoration: none; color: inherit; }
a:hover { opacity: 0.85; }

/* ── Site Nav ────────────────────────────────────────────────────────── */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background-color: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
  transition: box-shadow var(--transition);
}
.nav.scrolled {
  box-shadow: var(--shadow);
}
.nav__inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav__wordmark {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-navy);
  letter-spacing: -0.01em;
  flex-shrink: 0;
}
.nav__wordmark:hover { opacity: 0.75; }
.nav__links {
  list-style: none;
  display: flex;
  gap: 2rem;
  align-items: center;
}
.nav__links a {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--color-text);
  letter-spacing: 0.01em;
  transition: color var(--transition);
}
.nav__links a:hover {
  color: var(--color-navy);
  opacity: 1;
}
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  flex-shrink: 0;
}
.nav__hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-navy);
  transition: transform var(--transition), opacity var(--transition);
  transform-origin: center;
}
.nav__hamburger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav__hamburger.active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.nav__hamburger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── Article Header ──────────────────────────────────────────────────── */

.article-header {
  padding: calc(var(--nav-height) + 4rem) 1.5rem 3rem;
  background-color: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
}
.article-header__inner {
  max-width: 720px;
  margin: 0 auto;
}
.article-back {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--color-text-muted);
  margin-bottom: 2rem;
  transition: color var(--transition);
}
.article-back:hover {
  color: var(--color-navy);
  opacity: 1;
}
.article-header__tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 0.2rem 0.55rem;
  margin-bottom: 1.25rem;
}
.article-header h1 {
  font-family: var(--font-heading);
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  line-height: 1.25;
  color: var(--color-navy);
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}
.article-header__usage {
  font-size: 1.1rem;
  font-style: italic;
  color: var(--color-text);
  line-height: 1.6;
  margin-bottom: 1.25rem;
}
.article-header__desc {
  font-size: 1.05rem;
  color: var(--color-text);
  line-height: 1.7;
  margin-bottom: 1rem;
}
.article-header__subtitle {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin: 0;
}
.article-header__data-link {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  margin-top: 0.75rem;
}
.article-header__data-link a {
  color: var(--color-teal);
  font-weight: 500;
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* ── Dashboard Container (sticky boundary) ───────────────────────────── */

.tool-dashboard {
  position: relative;
}

/* ── Sticky Controls Bar ─────────────────────────────────────────────── */

.tool-controls {
  position: sticky;
  top: var(--nav-height);
  z-index: 90;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
  padding: 0.9rem 1.5rem;
}
.tool-controls__inner {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: 0.75rem 0;
}
.tool-controls__sliders {
  display: flex;
  align-items: end;
  gap: 0;
}
.tool-slider-group {
  padding: 0;
}
.tool-slider-group + .tool-slider-group {
  margin-left: 1.25rem;
  padding-left: 1.25rem;
  border-left: 1px solid var(--color-border);
}
.tool-slider-group__label {
  display: block;
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  white-space: nowrap;
  margin-bottom: 0.4rem;
  text-align: center;
}
.tool-slider-group__items {
  display: flex;
  gap: 1.25rem;
}
.tool-slider {
  min-width: 140px;
  width: 140px;
}
.tool-slider__label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  margin-bottom: 0.4rem;
  white-space: nowrap;
}
.tool-slider__val {
  color: var(--color-navy);
  font-weight: 700;
}
.tool-slider input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  display: block;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--color-border);
  outline: none;
  cursor: pointer;
  margin: 0;
  padding: 0;
}
.tool-slider input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-navy);
  cursor: grab;
  border: 2px solid #fff;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}
.tool-slider input[type="range"]::-webkit-slider-thumb:active {
  cursor: grabbing;
}
.tool-slider input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-navy);
  border: 2px solid #fff;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
  cursor: grab;
}
.tool-controls__spacer {
  flex: 1 1 auto;
}
.tool-controls__selects {
  display: flex;
  align-items: end;
  gap: 0.6rem;
  margin-left: 1.25rem;
  padding-left: 1.25rem;
  border-left: 1px solid var(--color-border);
}
.tool-controls__selects label {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}
.tool-controls__selects select {
  font-family: var(--font-body);
  font-size: 0.8rem;
  padding: 0.35rem 0.5rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: var(--color-bg);
  color: var(--color-text);
  cursor: pointer;
  max-width: 150px;
  min-width: 0;
}
.tool-controls__reset {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.35rem 0.8rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: var(--color-bg-alt);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}
.tool-controls__reset:hover {
  border-color: var(--color-navy);
  color: var(--color-navy);
}

/* ── KPI Cards ───────────────────────────────────────────────────────── */

.tool-kpis {
  padding: 1.25rem 1.5rem;
  background: var(--color-bg);
}
.tool-kpis__inner {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}
.tool-kpi {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  text-align: center;
}
.tool-kpi__label {
  display: block;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 0.3rem;
}
.tool-kpi__value {
  display: block;
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-navy);
}
.tool-kpi__delta {
  display: block;
  font-size: 0.78rem;
  font-weight: 600;
  margin-top: 0.25rem;
}
.tool-kpi__delta--pos { color: var(--color-green); }
.tool-kpi__delta--neg { color: var(--color-red); }
.tool-kpi__delta--zero { color: var(--color-text-muted); }
.tool-kpi__net {
  display: block;
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--color-text-muted);
  margin-top: 0.2rem;
}

/* ── Model Summary ────────────────────────────────────────────────────── */

.tool-model-summary {
  padding: 0 1.5rem;
  background: var(--color-bg);
}
.tool-model-summary__inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 1rem 1.25rem;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.92rem;
  color: var(--color-text);
  line-height: 1.7;
}
.tool-model-summary__inner strong {
  color: var(--color-navy);
}

/* ── Charts — Side by Side ───────────────────────────────────────────── */

.tool-charts-row {
  padding: 1.5rem;
  background: var(--color-bg);
}
.tool-charts-row__inner {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}
.tool-chart-panel {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  background: var(--color-bg);
  box-shadow: var(--shadow);
}
.tool-chart-panel__title {
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.75rem;
}
.tool-chart-panel canvas {
  width: 100% !important;
  height: 340px !important;
}
.tool-chart-panel__subtitle {
  font-size: 0.72rem;
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  color: var(--color-text-muted);
}
.tool-top10-other {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  text-align: center;
  padding: 0.5rem 0 0;
  border-top: 1px solid var(--color-border);
  margin-top: 0.5rem;
}

/* ── Key Insights ────────────────────────────────────────────────────── */

.tool-insights {
  padding: 3rem 1.5rem;
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
}
.tool-insights__inner {
  max-width: 760px;
  margin: 0 auto;
}
.tool-insights__inner h2 {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  color: var(--color-navy);
  margin-bottom: 2rem;
  letter-spacing: -0.02em;
}
.tool-insight {
  margin-bottom: 2rem;
}
.tool-insight h3 {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  color: var(--color-navy);
  margin-bottom: 0.6rem;
}
.tool-insight p {
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--color-text);
}
.tool-insight__download {
  margin-top: 0.75rem;
}
.tool-insight__download a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--color-teal);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.tool-insight__download a:hover {
  opacity: 0.8;
}
.tool-insights__bib-heading {
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}
.tool-insights__bib {
  padding-left: 1.5rem;
  margin: 0;
}
.tool-insights__bib li {
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}
.tool-insights__bib li em {
  font-style: italic;
}
.tool-insights__bib li a {
  color: var(--color-navy);
  font-weight: 500;
}

/* ── Model Details ───────────────────────────────────────────────────── */

.tool-details-section {
  padding: 2rem 1.5rem;
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
}
.tool-details-wrap {
  max-width: 800px;
  margin: 0 auto;
}
.tool-details summary {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-navy);
  cursor: pointer;
  padding: 0.75rem 0;
  list-style: none;
}
.tool-details summary::-webkit-details-marker { display: none; }
.tool-details summary::before {
  content: "\25B6";
  font-size: 0.65rem;
  margin-right: 0.5rem;
  transition: transform var(--transition);
  display: inline-block;
}
.tool-details[open] summary::before { transform: rotate(90deg); }
.tool-details__body { padding-top: 1rem; }
.tool-details__body h3 {
  font-size: 0.9rem;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--color-text);
}
.tool-details__body h3:first-child { margin-top: 0; }
.tool-details__body p {
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--color-text-muted);
}
.tool-details__body a {
  color: var(--color-navy);
  font-weight: 500;
}
.tool-eq {
  font-size: 0.85rem;
  padding: 0.5rem 0.75rem;
  margin-bottom: 0.5rem;
  background: var(--color-bg-alt);
  border-left: 3px solid var(--color-navy);
  border-radius: 2px;
  font-family: "Cambria Math", Georgia, serif;
}
.tool-eq strong { font-family: var(--font-body); }
.tool-coef-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
  margin: 0.75rem 0;
}
.tool-coef-table th,
.tool-coef-table td {
  padding: 0.4rem 0.6rem;
  border-bottom: 1px solid var(--color-border);
  text-align: left;
}
.tool-coef-table th {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
}

/* ── Footer ──────────────────────────────────────────────────────────── */

.tool-footer {
  padding: 1.5rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
}

/* ── Responsive ──────────────────────────────────────────────────────── */

@media (max-width: 1100px) {
  .tool-controls__inner {
    grid-template-columns: 1fr;
  }
  .tool-charts-row__inner {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 768px) {
  .nav__hamburger {
    display: flex;
  }
  .nav__links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.98);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    gap: 0;
    padding: 0.5rem 0;
    display: none;
    box-shadow: var(--shadow);
  }
  .nav__links.open {
    display: flex;
  }
  .nav__links li {
    width: 100%;
  }
  .nav__links a {
    display: block;
    padding: 0.85rem 1.5rem;
    font-size: 1rem;
  }
  .tool-controls__selects {
    flex-wrap: wrap;
  }
  .tool-kpis__inner {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 500px) {
  .tool-kpis__inner {
    grid-template-columns: 1fr 1fr;
  }
  .tool-chart-panel canvas {
    height: 240px !important;
  }
}