/* ===========================
   CRYPTOGRAPHIE — CSS
   Thème : Mathématique / Chiffrement
   Ambiance : Encre & Or / Cabinet de curiosités scientifique
   =========================== */

@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,700;1,400;1,700&family=Space+Mono:ital,wght@0,400;0,700;1,400&family=Nunito:wght@300;400;600&display=swap');

:root {
  --bg:          #080808;
  --bg-panel:    #0e0e0e;
  --bg-card:     #141414;
  --bg-card-alt: #111111;
  --gold:        #d4a017;
  --gold-light:  #f0c040;
  --gold-dim:    rgba(212, 160, 23, 0.12);
  --gold-glow:   rgba(212, 160, 23, 0.22);
  --crimson:     #b91c1c;
  --teal:        #0d9488;
  --text:        #e2d9c8;
  --text-muted:  #7a6f5e;
  --text-dim:    #4a4035;
  --border:      rgba(212, 160, 23, 0.14);
  --border-soft: rgba(255, 255, 255, 0.05);
  --font-serif:  'Playfair Display', serif;
  --font-mono:   'Space Mono', monospace;
  --font-body:   'Nunito', sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  overflow-x: hidden;
  position: relative;
}

/* ── Noise texture overlay ── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.035'/%3E%3C/svg%3E");
  background-size: 200px;
  pointer-events: none;
  z-index: 0;
  opacity: 0.6;
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--gold); border-radius: 3px; }

/* ══ CIPHER CANVAS ══ */
#cipher-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.22;
}

/* ══ LAYOUT ══ */
.page-wrapper {
  position: relative;
  z-index: 1;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 36px 100px;
}

/* ══ ORNAMENTAL DIVIDER ══ */
.ornament {
  display: flex;
  align-items: center;
  gap: 16px;
  color: var(--gold);
  opacity: 0.4;
  margin: 12px 0;
}
.ornament::before, .ornament::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold));
}
.ornament::after { background: linear-gradient(270deg, transparent, var(--gold)); }
.ornament span { font-family: var(--font-mono); font-size: 0.7rem; white-space: nowrap; letter-spacing: 0.2em; }

/* ══ HEADER ══ */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 0 18px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 12px;
}

.breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  letter-spacing: 0.06em;
}
.breadcrumb a { color: var(--gold); text-decoration: none; }
.breadcrumb span { margin: 0 8px; opacity: 0.4; }

.header-badge {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  padding: 4px 14px;
  border: 1px solid var(--border);
  border-radius: 2px;
  color: var(--gold);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  background: var(--gold-dim);
}

/* ══ HERO ══ */
.hero {
  padding: 80px 0 56px;
  text-align: center;
  position: relative;
}

.hero-sigil {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--gold);
  letter-spacing: 0.28em;
  text-transform: uppercase;
  margin-bottom: 32px;
  opacity: 0.7;
}

.hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(3rem, 7vw, 5.5rem);
  font-weight: 700;
  color: var(--gold-light);
  line-height: 1.05;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
  text-shadow: 0 0 60px rgba(212,160,23,0.3);
}

.hero h1 em {
  font-style: italic;
  color: var(--text);
  font-size: 0.6em;
  display: block;
  letter-spacing: 0.05em;
}

.hero-formula {
  font-family: var(--font-mono);
  font-size: clamp(0.75rem, 1.5vw, 1rem);
  color: var(--text-muted);
  margin: 28px auto;
  letter-spacing: 0.04em;
  max-width: 580px;
  line-height: 1.9;
}

.hero-formula .hl { color: var(--gold); }

.hero-desc {
  max-width: 600px;
  margin: 24px auto 0;
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.8;
}

/* ══ STATS ══ */
.stats-row {
  display: flex;
  justify-content: center;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
  margin: 48px 0 64px;
  background: var(--bg-card);
}

.stat-cell {
  flex: 1;
  padding: 24px 20px;
  text-align: center;
  border-right: 1px solid var(--border);
  transition: background 0.25s;
}
.stat-cell:last-child { border-right: none; }
.stat-cell:hover { background: var(--gold-dim); }

.stat-num {
  font-family: var(--font-serif);
  font-size: 2rem;
  color: var(--gold-light);
  line-height: 1;
  font-weight: 700;
}

.stat-label {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: 6px;
}

/* ══ NAV ══ */
.section-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 64px;
  padding: 16px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.nav-pill {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  padding: 6px 16px;
  border: 1px solid var(--border);
  border-radius: 2px;
  color: var(--text-muted);
  text-decoration: none;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  transition: all 0.2s;
  background: transparent;
}
.nav-pill:hover, .nav-pill.active {
  border-color: var(--gold);
  color: var(--gold);
  background: var(--gold-dim);
}

/* ══ SECTIONS ══ */
.content-section {
  margin-bottom: 88px;
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.content-section.visible { opacity: 1; transform: translateY(0); }

.section-header {
  display: flex;
  align-items: flex-end;
  gap: 20px;
  margin-bottom: 36px;
}

.section-num {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-dim);
  letter-spacing: 0.1em;
  padding-bottom: 2px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  color: var(--gold-light);
  font-style: italic;
  line-height: 1.15;
}

/* ══ CARD GRID ══ */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 16px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 26px;
  position: relative;
  overflow: hidden;
  transition: border-color 0.3s, transform 0.3s;
}
.card::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  transform: scaleX(0);
  transition: transform 0.4s;
}
.card:hover { border-color: rgba(212,160,23,0.4); transform: translateY(-3px); }
.card:hover::after { transform: scaleX(1); }

.card-era {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: var(--gold);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: 10px;
  opacity: 0.8;
}

.card h3 {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  color: var(--text);
  margin-bottom: 10px;
  font-weight: 700;
}

.card p {
  font-size: 0.89rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ══ CIPHER DEMO ══ */
.cipher-demo {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 32px;
  margin: 28px 0;
  position: relative;
}

.cipher-demo::before {
  content: attr(data-title);
  position: absolute;
  top: -10px; left: 24px;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--gold);
  background: var(--bg-card);
  padding: 0 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.cipher-row {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 12px;
  align-items: center;
  margin-bottom: 12px;
}

.cipher-row:last-child { margin-bottom: 0; }

.cipher-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-dim);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.cipher-value {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--gold-light);
  letter-spacing: 0.08em;
  word-break: break-all;
  line-height: 1.5;
}

.cipher-value.plain  { color: var(--text); }
.cipher-value.key    { color: var(--teal); }
.cipher-value.cipher { color: var(--gold-light); }
.cipher-value.hash   { color: var(--crimson); font-size: 0.75rem; }

/* ══ MATH BLOCK ══ */
.math-block {
  background: var(--bg-panel);
  border-left: 2px solid var(--gold);
  padding: 24px 28px;
  margin: 20px 0;
  position: relative;
  overflow: hidden;
}

.math-block::before {
  content: '∑';
  position: absolute;
  right: 16px; top: 8px;
  font-size: 4rem;
  color: var(--gold);
  opacity: 0.04;
  font-family: serif;
}

.math-block .math-title {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--gold);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.math-block .formula {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--text);
  letter-spacing: 0.05em;
  line-height: 1.8;
  margin-bottom: 10px;
}

.math-block p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ══ CODE ══ */
.code-snippet {
  background: #050505;
  border: 1px solid var(--border);
  border-radius: 2px;
  overflow: hidden;
  margin: 22px 0;
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 18px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-panel);
}

.code-lang {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--gold);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.code-dots { display: flex; gap: 6px; }
.code-dots span { width: 9px; height: 9px; border-radius: 50%; }
.code-dots span:nth-child(1) { background: #ff5f57; }
.code-dots span:nth-child(2) { background: #febc2e; }
.code-dots span:nth-child(3) { background: #28c840; }

.code-snippet pre {
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.8;
  color: #7a8a7a;
  overflow-x: auto;
}

.code-snippet .kw  { color: #d4a017; }
.code-snippet .fn  { color: #0d9488; }
.code-snippet .str { color: #a78bfa; }
.code-snippet .num { color: #f87171; }
.code-snippet .cm  { color: #4a4a3a; font-style: italic; }
.code-snippet .ty  { color: #86efac; }

/* ══ COMPARISON TABLE ══ */
.cmp-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.86rem;
  margin: 20px 0;
}

.cmp-table thead th {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gold);
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  background: var(--bg-card);
}

.cmp-table tbody td {
  padding: 13px 16px;
  border-bottom: 1px solid var(--border-soft);
  color: var(--text-muted);
  vertical-align: top;
}

.cmp-table tbody td:first-child {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text);
}

.cmp-table tbody tr:hover td { background: var(--gold-dim); }

.tag {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  padding: 2px 8px;
  border-radius: 2px;
  background: rgba(13, 148, 136, 0.12);
  color: var(--teal);
  border: 1px solid rgba(13,148,136,0.2);
}
.tag.danger {
  background: rgba(185, 28, 28, 0.12);
  color: var(--crimson);
  border-color: rgba(185,28,28,0.2);
}
.tag.gold {
  background: var(--gold-dim);
  color: var(--gold);
  border-color: var(--border);
}

/* ══ TIMELINE ══ */
.timeline { position: relative; padding-left: 32px; }
.timeline::before {
  content: '';
  position: absolute;
  left: 8px; top: 8px; bottom: 8px;
  width: 1px;
  background: linear-gradient(to bottom, var(--gold), transparent);
}

.timeline-item {
  position: relative;
  margin-bottom: 32px;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -28px; top: 6px;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 8px rgba(212,160,23,0.5);
}

.timeline-year {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--gold);
  letter-spacing: 0.1em;
  margin-bottom: 4px;
}

.timeline-item h4 {
  font-family: var(--font-serif);
  font-size: 1rem;
  color: var(--text);
  margin-bottom: 4px;
}

.timeline-item p { font-size: 0.87rem; color: var(--text-muted); }

/* ══ KEY-VALUE LIST ══ */
.kv-list { display: flex; flex-direction: column; gap: 10px; }

.kv-item {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 16px;
  padding: 14px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-left: 2px solid var(--border);
  transition: border-left-color 0.2s;
}
.kv-item:hover { border-left-color: var(--gold); }

.kv-key {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--gold);
  letter-spacing: 0.06em;
  padding-top: 2px;
}

.kv-val {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ══ QUOTE ══ */
.blockquote {
  border: 1px solid var(--border);
  border-left: 3px solid var(--gold);
  padding: 22px 26px;
  margin: 28px 0;
  background: var(--gold-dim);
  position: relative;
}

.blockquote::before {
  content: '"';
  position: absolute;
  top: -10px; left: 20px;
  font-family: var(--font-serif);
  font-size: 3rem;
  color: var(--gold);
  opacity: 0.3;
  line-height: 1;
}

.blockquote p {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-style: italic;
  color: var(--text);
}

.blockquote cite {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  font-style: normal;
}

/* ══ TOOL PILLS ══ */
.tool-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 13px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 2px;
  margin: 4px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  transition: all 0.2s;
}
.tool-pill:hover { border-color: var(--gold); color: var(--gold); }
.tool-pill .dot { width: 5px; height: 5px; border-radius: 50%; background: var(--gold); }

/* ══ FOOTER ══ */
.page-footer {
  margin-top: 88px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.page-footer p {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-dim);
}
.page-footer a { color: var(--gold); text-decoration: none; }

/* ══ RESPONSIVE ══ */
@media (max-width: 700px) {
  .page-wrapper { padding: 0 18px 80px; }
  .hero { padding: 56px 0 36px; }
  .stats-row { flex-wrap: wrap; }
  .stat-cell { min-width: 50%; border-right: none; border-bottom: 1px solid var(--border); }
  .kv-item { grid-template-columns: 1fr; gap: 4px; }
  .cipher-row { grid-template-columns: 70px 1fr; }
}