/* =============================================
   L'Argent Expliqué — Shared Stylesheet
   Mobile-first, dark green theme
   ============================================= */

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

:root {
  --bg-deep:    #0A2A1E;
  --bg-card:    #0E3325;
  --bg-input:   #102D20;
  --accent:     #1FE08A;
  --accent-dim: #17b06e;
  --text:       #EAF2EE;
  --text-muted: #9FB4AB;
  --border:     #1a4a33;
  --danger:     #FF6B6B;
  --warn:       #FFD166;
  --radius:     12px;
  --radius-sm:  8px;
  --shadow:     0 4px 24px rgba(0,0,0,0.35);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg-deep);
  color: var(--text);
  font-size: 16px;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ---- Layout ---- */
.container {
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
  padding: 0 16px;
}

main { flex: 1; padding: 24px 0 40px; }

/* ---- Header ---- */
.site-header {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 14px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 6px;
}

.brand {
  text-decoration: none;
  display: flex;
  flex-direction: column;
}

.brand-name {
  color: var(--accent);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.3px;
  line-height: 1.2;
}

.brand-sub {
  color: var(--text-muted);
  font-size: 0.72rem;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent);
  color: #0A2A1E;
  font-weight: 700;
  font-size: 0.78rem;
  padding: 7px 14px;
  border-radius: 20px;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.2s;
}

.header-cta:hover { background: var(--accent-dim); }

/* ---- Nav breadcrumb ---- */
.breadcrumb {
  font-size: 0.82rem;
  color: var(--text-muted);
  padding: 10px 0 0;
  display: flex;
  gap: 6px;
  align-items: center;
  flex-wrap: wrap;
}

.breadcrumb a { color: var(--accent); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb-sep { color: var(--border); }

/* ---- Calculator card ---- */
.calc-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: 24px 20px;
  margin-bottom: 20px;
}

.calc-title {
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--text);
  line-height: 1.25;
  margin-bottom: 8px;
  letter-spacing: -0.5px;
}

.calc-intro {
  color: var(--text-muted);
  font-size: 0.92rem;
  margin-bottom: 20px;
  line-height: 1.55;
}

/* ---- Form ---- */
.form-group { margin-bottom: 16px; }

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 6px;
  letter-spacing: 0.2px;
}

.form-group label span.required { color: var(--accent); margin-left: 2px; }

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

input[type="number"], input[type="text"] {
  width: 100%;
  background: var(--bg-input);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font);
  font-size: 1.05rem;
  padding: 12px 14px;
  -webkit-appearance: none;
  appearance: none;
  outline: none;
  transition: border-color 0.2s;
  /* Minimum tap target */
  min-height: 48px;
}

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

input[type="number"]::placeholder { color: var(--text-muted); opacity: 0.6; }

/* Hide spinners */
input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; }
input[type="number"] { -moz-appearance: textfield; }

/* Input with unit suffix */
.input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.input-wrap input { padding-right: 40px; }

.input-unit {
  position: absolute;
  right: 14px;
  color: var(--text-muted);
  font-size: 0.85rem;
  pointer-events: none;
}

/* ---- Result card ---- */
.result-card {
  background: linear-gradient(135deg, #0E3325 0%, #0f3d28 100%);
  border: 1.5px solid var(--accent);
  border-radius: var(--radius);
  padding: 20px;
  margin-top: 20px;
  text-align: center;
}

.result-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.result-main {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -1px;
  line-height: 1.15;
}

.result-sub {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.result-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 14px;
}

.result-item {
  background: rgba(31, 224, 138, 0.06);
  border-radius: var(--radius-sm);
  padding: 12px 10px;
  text-align: center;
}

.result-item .ri-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 3px;
}

.result-item .ri-value {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
}

.result-item.accent .ri-value { color: var(--accent); }
.result-item.warn .ri-value { color: var(--warn); }
.result-item.danger .ri-value { color: var(--danger); }

/* Alert / message */
.alert {
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-size: 0.88rem;
  line-height: 1.5;
  margin-top: 14px;
}

.alert-warn {
  background: rgba(255, 209, 102, 0.1);
  border-left: 3px solid var(--warn);
  color: var(--warn);
}

.alert-danger {
  background: rgba(255, 107, 107, 0.1);
  border-left: 3px solid var(--danger);
  color: var(--danger);
}

.alert-info {
  background: rgba(31, 224, 138, 0.08);
  border-left: 3px solid var(--accent);
  color: var(--text-muted);
}

/* Error message on bad input */
.input-error { display: none; font-size: 0.8rem; color: var(--danger); margin-top: 4px; }
.input-error.show { display: block; }

/* ---- Canvas chart ---- */
.chart-wrap {
  margin-top: 20px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--bg-input);
  padding: 14px;
}

.chart-title {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-muted);
  margin-bottom: 10px;
  text-align: center;
}

canvas {
  display: block;
  width: 100%;
  height: auto;
}

/* Legend */
.chart-legend {
  display: flex;
  gap: 14px;
  justify-content: center;
  margin-top: 10px;
  flex-wrap: wrap;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* ---- How it works ---- */
.how-it-works {
  background: rgba(31, 224, 138, 0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin-top: 0;
}

.how-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.how-it-works p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 6px;
}

.how-it-works p:last-child { margin-bottom: 0; }

.formula-block {
  background: var(--bg-input);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 0.82rem;
  color: var(--accent);
  font-family: "Courier New", Courier, monospace;
  margin: 8px 0;
  overflow-x: auto;
  word-break: break-all;
}

/* ---- Table ---- */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  margin-top: 4px;
}

.data-table th {
  text-align: left;
  padding: 8px 12px;
  background: var(--bg-input);
  color: var(--text-muted);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--border);
}

.data-table td {
  padding: 9px 12px;
  border-bottom: 1px solid rgba(26,74,51,0.5);
  color: var(--text);
}

.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: rgba(31,224,138,0.04); }
.data-table td.td-accent { color: var(--accent); font-weight: 700; }

/* ---- CTA YouTube ---- */
.yt-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: linear-gradient(135deg, #1a4232, #0f3d28);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  padding: 18px 20px;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 0.97rem;
  transition: background 0.2s, transform 0.15s;
  margin-top: 0;
}

.yt-cta:hover { background: linear-gradient(135deg, #1f4f3c, #133d28); transform: translateY(-1px); }
.yt-cta-icon { font-size: 1.4rem; }
.yt-cta-arrow { margin-left: auto; color: var(--accent); font-size: 1.1rem; }

/* ---- Hub / index cards ---- */
.hub-grid {
  display: grid;
  gap: 14px;
}

.hub-card {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  text-decoration: none;
  color: var(--text);
  transition: border-color 0.2s, transform 0.15s;
  box-shadow: var(--shadow);
}

.hub-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.hub-icon {
  font-size: 1.8rem;
  flex-shrink: 0;
  width: 44px;
  text-align: center;
  margin-top: 2px;
}

.hub-card-body {}

.hub-card-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}

.hub-card-desc {
  font-size: 0.83rem;
  color: var(--text-muted);
  line-height: 1.45;
}

.hub-card-arrow {
  margin-left: auto;
  align-self: center;
  color: var(--accent);
  font-size: 1.1rem;
  flex-shrink: 0;
}

/* ---- Related links ---- */
.related-links {
  margin-top: 0;
}

.related-title {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.related-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.related-list li a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.88rem;
  transition: border-color 0.2s, color 0.2s;
}

.related-list li a:hover { border-color: var(--accent); color: var(--text); }
.related-list li a::before { content: "→"; color: var(--accent); font-weight: 700; }

/* ---- Ad slot placeholder ---- */
.ad-placeholder {
  display: none; /* Hidden until AdSense activated */
  text-align: center;
  padding: 14px;
  color: var(--text-muted);
  font-size: 0.78rem;
}

/* ---- Footer ---- */
.site-footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  padding: 28px 0;
  margin-top: auto;
}

.footer-yt {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: 16px;
}

.footer-yt a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--accent);
  font-weight: 700;
  font-size: 0.92rem;
  text-decoration: none;
}

.footer-yt a:hover { text-decoration: underline; }

.footer-disclaimer {
  font-size: 0.76rem;
  color: var(--text-muted);
  text-align: center;
  line-height: 1.6;
  max-width: 560px;
  margin: 0 auto 14px;
  padding: 0 8px;
}

.footer-disclaimer strong { color: var(--warn); }

.footer-links {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.8rem;
  text-decoration: none;
}

.footer-links a:hover { color: var(--accent); }

.footer-copy {
  text-align: center;
  font-size: 0.74rem;
  color: var(--border);
}

/* ---- Divider ---- */
.divider { border: none; border-top: 1px solid var(--border); margin: 20px 0; }

/* ---- Spacing utils ---- */
.mt-0 { margin-top: 0; }
.mt-sm { margin-top: 10px; }
.mt-md { margin-top: 20px; }
.mt-lg { margin-top: 28px; }
.stack { display: flex; flex-direction: column; gap: 16px; }

/* ---- Responsive tweaks ---- */
@media (max-width: 380px) {
  .result-main { font-size: 2rem; }
  .calc-title { font-size: 1.3rem; }
  .form-row { grid-template-columns: 1fr; }
  .result-grid { grid-template-columns: 1fr; }
}