/* AlgoTradingLab — Simulateur pédagogique fermé */
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500&family=Inter:wght@500;600;700&family=Source+Sans+3:wght@400;500;600&display=swap');

:root {
  --midnight: #0C1322;
  --teal: #0E7490;
  --amber: #B45309;
  --cream: #FAFAF9;
  --steel: #64748B;
  --teal-light: #0891b2;
  --midnight-soft: #151d2e;
  --border: rgba(100, 116, 139, 0.35);
  --shadow: 0 4px 24px rgba(12, 19, 34, 0.45);
  --radius: 6px;
  --font-title: 'Inter', system-ui, sans-serif;
  --font-body: 'Source Sans 3', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;
}

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

html {
  scroll-behavior: smooth;
  font-size: 100%;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--cream);
  background: var(--midnight);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--teal-light);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover { color: var(--cream); }

h1, h2, h3, h4 {
  font-family: var(--font-title);
  font-weight: 600;
  line-height: 1.25;
  margin-top: 0;
}

h1 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h2 { font-size: clamp(1.35rem, 3vw, 1.75rem); margin-bottom: 1rem; }
h3 { font-size: 1.15rem; margin-bottom: 0.5rem; }

p { margin: 0 0 1rem; }

.container {
  width: min(1120px, 92vw);
  margin: 0 auto;
}

/* Header / Console bar */
.site-header {
  background: var(--midnight-soft);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 0;
  gap: 1rem;
}

.logo {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.logo a {
  color: var(--cream);
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
}

.logo-tagline {
  font-size: 0.72rem;
  color: var(--steel);
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--cream);
  padding: 0.4rem 0.65rem;
  border-radius: var(--radius);
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.main-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 0.25rem;
  flex-wrap: wrap;
}

.main-nav a {
  display: block;
  padding: 0.45rem 0.85rem;
  color: var(--steel);
  font-size: 0.92rem;
  font-weight: 500;
  border-radius: var(--radius);
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--cream);
  background: rgba(14, 116, 144, 0.2);
}

/* Hero */
.hero {
  position: relative;
  padding: 4rem 0 3.5rem;
  background: linear-gradient(165deg, var(--midnight-soft) 0%, var(--midnight) 55%);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 70% 20%, rgba(14, 116, 144, 0.15), transparent),
    repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(100, 116, 139, 0.03) 2px, rgba(100, 116, 139, 0.03) 4px);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: center;
  position: relative;
}

.hero-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--teal-light);
  border: 1px solid var(--teal);
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  margin-bottom: 1rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.hero h1 { margin-bottom: 1rem; }

.hero-lead {
  font-size: 1.15rem;
  color: var(--steel);
  max-width: 36ch;
}

.hero-slogan {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--amber);
  border-left: 3px solid var(--amber);
  padding-left: 1rem;
  margin: 1.5rem 0;
  font-style: italic;
}

.hero-image {
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  aspect-ratio: 4/3;
  object-fit: cover;
}

/* Buttons */
.btn {
  display: inline-block;
  font-family: var(--font-title);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.75rem 1.35rem;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.2s ease;
  text-align: center;
}

.btn-primary {
  background: var(--teal);
  color: var(--cream);
}

.btn-primary:hover {
  background: var(--teal-light);
  color: var(--cream);
  transform: translateY(-1px);
}

.btn-secondary {
  background: transparent;
  color: var(--cream);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--teal);
  color: var(--cream);
}

.btn-amber {
  background: var(--amber);
  color: var(--cream);
}

.btn-amber:hover {
  background: #c2620a;
  color: var(--cream);
}

/* Sections */
main { flex: 1; }

.section {
  padding: 3.5rem 0;
}

.section-alt {
  background: var(--midnight-soft);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-header {
  margin-bottom: 2rem;
  max-width: 52ch;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--teal-light);
  margin-bottom: 0.5rem;
}

/* Cards grid */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

.card {
  background: var(--midnight-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.35rem;
  transition: border-color 0.2s ease;
}

.card:hover { border-color: var(--teal); }

.card-code {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--amber);
  margin-bottom: 0.5rem;
}

.card h3 { color: var(--cream); }

.card p:last-child { margin-bottom: 0; }

/* Journal excerpt */
.journal-block {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  background: rgba(12, 19, 34, 0.8);
  border: 1px solid var(--border);
  border-left: 3px solid var(--teal);
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
  color: var(--steel);
  overflow-x: auto;
}

.journal-block .timestamp { color: var(--teal-light); }

/* Disclaimer */
.disclaimer {
  background: rgba(180, 83, 9, 0.12);
  border: 1px solid rgba(180, 83, 9, 0.35);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  font-size: 0.88rem;
  color: var(--steel);
  line-height: 1.6;
}

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

/* Two column layout */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
}

/* Feature list */
.feature-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.feature-list li {
  padding: 0.65rem 0 0.65rem 1.5rem;
  position: relative;
  border-bottom: 1px solid var(--border);
}

.feature-list li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--teal);
  font-family: var(--font-mono);
}

/* FAQ */
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 0.75rem;
  overflow: hidden;
}

.faq-question {
  width: 100%;
  text-align: left;
  background: var(--midnight-soft);
  border: none;
  color: var(--cream);
  font-family: var(--font-title);
  font-size: 1rem;
  font-weight: 600;
  padding: 1rem 1.25rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.faq-question:hover { background: rgba(14, 116, 144, 0.1); }

.faq-question::after {
  content: '+';
  font-family: var(--font-mono);
  color: var(--teal);
  font-size: 1.25rem;
  flex-shrink: 0;
}

.faq-item.open .faq-question::after { content: '−'; }

.faq-answer {
  display: none;
  padding: 0 1.25rem 1rem;
  color: var(--steel);
}

.faq-item.open .faq-answer { display: block; }

/* Contact form */
.contact-form {
  display: grid;
  gap: 1rem;
}

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

.form-group label {
  display: block;
  font-size: 0.88rem;
  font-weight: 500;
  margin-bottom: 0.35rem;
  color: var(--steel);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.65rem 0.85rem;
  background: var(--midnight);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--cream);
  font-family: var(--font-body);
  font-size: 1rem;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--teal);
}

.form-group textarea { min-height: 140px; resize: vertical; }

.form-note {
  font-size: 0.85rem;
  color: var(--steel);
}

/* Legal pages */
.legal-content h2 {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.legal-content h2:first-of-type {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

.legal-content ul, .legal-content ol {
  margin: 0 0 1rem;
  padding-left: 1.5rem;
  color: var(--steel);
}

.legal-content li { margin-bottom: 0.35rem; }

/* 404 */
.error-page {
  text-align: center;
  padding: 5rem 0;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 4rem;
  color: var(--teal);
  opacity: 0.5;
  margin-bottom: 0.5rem;
}

/* Footer */
.site-footer {
  background: var(--midnight-soft);
  border-top: 1px solid var(--border);
  padding: 2.5rem 0 1.5rem;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-brand p {
  font-size: 0.9rem;
  color: var(--steel);
}

.footer-nav h4,
.footer-legal h4 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--steel);
  margin-bottom: 0.75rem;
}

.footer-nav ul,
.footer-legal ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-nav li,
.footer-legal li { margin-bottom: 0.4rem; }

.footer-nav a,
.footer-legal a {
  font-size: 0.9rem;
  color: var(--steel);
}

.footer-nav a:hover,
.footer-legal a:hover { color: var(--cream); }

.footer-note {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--steel);
  border-top: 1px solid var(--border);
  padding-top: 1.25rem;
  line-height: 1.5;
}

.footer-meta {
  font-size: 0.8rem;
  color: var(--steel);
  margin-top: 0.75rem;
}

/* Cookie banner */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--midnight-soft);
  border-top: 1px solid var(--border);
  padding: 1.25rem;
  z-index: 1000;
  box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.4);
  transform: translateY(100%);
  transition: transform 0.35s ease;
}

.cookie-banner.visible { transform: translateY(0); }

.cookie-inner {
  max-width: 1120px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  justify-content: space-between;
}

.cookie-text {
  flex: 1 1 400px;
  font-size: 0.88rem;
  color: var(--steel);
  margin: 0;
}

.cookie-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.cookie-actions .btn {
  font-size: 0.85rem;
  padding: 0.55rem 1rem;
}

/* Page header */
.page-header {
  padding: 2.5rem 0 2rem;
  background: var(--midnight-soft);
  border-bottom: 1px solid var(--border);
}

.page-header h1 { margin-bottom: 0.5rem; }

.page-header .lead {
  color: var(--steel);
  max-width: 60ch;
  margin: 0;
}

/* Image with caption */
.figure-block {
  margin: 1.5rem 0;
}

.figure-block img {
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.figure-caption {
  font-size: 0.82rem;
  color: var(--steel);
  margin-top: 0.5rem;
  font-family: var(--font-mono);
}

/* Status messages */
.alert {
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
}

.alert-success {
  background: rgba(14, 116, 144, 0.2);
  border: 1px solid var(--teal);
  color: var(--cream);
}

.alert-error {
  background: rgba(180, 83, 9, 0.15);
  border: 1px solid var(--amber);
  color: var(--cream);
}

/* Responsive */
@media (max-width: 768px) {
  .nav-toggle { display: block; }

  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--midnight-soft);
    border-bottom: 1px solid var(--border);
    padding: 0.5rem;
  }

  .main-nav.open { display: block; }

  .main-nav ul { flex-direction: column; }

  .hero-grid,
  .two-col,
  .footer-grid,
  .form-row {
    grid-template-columns: 1fr;
  }

  .hero { padding: 2.5rem 0 2rem; }

  .cookie-inner { flex-direction: column; align-items: stretch; }
}