/* ==========================================================================
   Crypto Learn — « Terminal de lecture »
   Data-tech sombre éditorial : quadrillage + grain, mono display géant,
   accent ambre unique, sidebar fixe, ticker, sections indexées [0n].
   Aucune classe custom : variables Bootstrap + ids / data-attributes.
   ========================================================================== */

:root,
[data-bs-theme='dark'] {
  --k-bg: #0a0d14;
  --k-panel: #0f141e;
  --k-panel-2: #141b28;
  --k-line: #1e2635;
  --k-line-2: #2b3547;
  --k-text: #e6eaf2;
  --k-mute: #8b96aa;
  --k-cream: #f5f0e6;
  --k-amber: #f5a524;
  --k-amber-2: #fbbf24;
  --k-violet: #8b5cf6;
  --k-green: #3ddc84;
  --k-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --k-serif: 'Literata', Georgia, 'Times New Roman', serif;
  --k-ease: cubic-bezier(0.16, 1, 0.3, 1);

  --bs-body-bg: var(--k-bg);
  --bs-body-bg-rgb: 10, 13, 20;
  --bs-body-color: var(--k-text);
  --bs-body-color-rgb: 230, 234, 242;
  --bs-body-font-family: var(--k-serif);
  --bs-body-font-size: 1.0625rem;
  --bs-body-line-height: 1.7;
  --bs-secondary-color: var(--k-mute);
  --bs-secondary-color-rgb: 139, 150, 170;
  --bs-emphasis-color: var(--k-cream);
  --bs-border-color: var(--k-line);
  --bs-border-radius: 0;
  --bs-border-radius-sm: 0;
  --bs-border-radius-lg: 0;
  --bs-primary: var(--k-amber);
  --bs-primary-rgb: 245, 165, 36;
  --bs-warning: var(--k-amber);
  --bs-warning-rgb: 245, 165, 36;
  --bs-success: var(--k-green);
  --bs-success-rgb: 61, 220, 132;
  --bs-link-color: var(--k-amber-2);
  --bs-link-color-rgb: 251, 191, 36;
  --bs-link-hover-color: var(--k-cream);
  --bs-link-hover-color-rgb: 245, 240, 230;
  --bs-heading-color: var(--k-cream);
  --bs-focus-ring-color: rgba(139, 92, 246, 0.55);
  color-scheme: dark;
}

/* ---------- Fond : quadrillage + grain (playbook 8-A) ---------- */
body {
  background-color: var(--k-bg);
  background-image:
    linear-gradient(rgba(230, 234, 242, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(230, 234, 242, 0.035) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-font-smoothing: antialiased;
  font-optical-sizing: auto;
}
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 2000;
  opacity: 0.08;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
::selection { background: var(--k-amber); color: var(--k-bg); }

h1, h2, h3, h4, h5, .h1, .h2, .h3, .h4, .h5,
.nav-link, .btn, .badge, dt, dd, label, .form-control, .input-group-text,
footer, .small, small, [data-price] {
  font-family: var(--k-mono);
}
h1, h2, h3, h4, h5, .h2, .h4, .h5 { letter-spacing: -0.03em; font-weight: 700; }
a { text-underline-offset: 0.2em; transition: color 0.2s var(--k-ease); }
img { max-width: 100%; height: auto; }

/* ---------- Boutons ---------- */
.btn { --bs-btn-border-radius: 0; text-transform: uppercase; letter-spacing: 0.04em; font-size: 0.85rem; font-weight: 700; transition: transform 0.2s var(--k-ease), box-shadow 0.2s var(--k-ease), background-color 0.2s; }
.btn-warning {
  --bs-btn-bg: var(--k-amber);
  --bs-btn-border-color: var(--k-amber);
  --bs-btn-color: var(--k-bg);
  --bs-btn-hover-bg: var(--k-amber-2);
  --bs-btn-hover-border-color: var(--k-amber-2);
  --bs-btn-hover-color: var(--k-bg);
  --bs-btn-active-bg: var(--k-cream);
  --bs-btn-active-color: var(--k-bg);
  box-shadow: 4px 4px 0 rgba(245, 165, 36, 0.25);
}
.btn-warning:hover { transform: translate(-2px, -2px); box-shadow: 6px 6px 0 rgba(245, 165, 36, 0.35); }
.btn-warning:active { transform: translate(2px, 2px); box-shadow: 0 0 0 transparent; }
.btn-outline-warning {
  --bs-btn-color: var(--k-amber);
  --bs-btn-border-color: var(--k-line-2);
  --bs-btn-hover-bg: var(--k-amber);
  --bs-btn-hover-border-color: var(--k-amber);
  --bs-btn-hover-color: var(--k-bg);
}
:focus-visible { outline: 2px solid var(--k-violet); outline-offset: 3px; }

/* ---------- Logo (PNG sombre d'origine → inversé : le point devient ambre) ---------- */
#k187mvg img, #k14jbis img, #k1qh6gj img { filter: invert(1); width: 150px; height: auto; }

/* ---------- Barre mobile ---------- */
#k14jbis {
  z-index: 1030;
  background: rgba(10, 13, 20, 0.82);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

/* ---------- Sidebar verticale fixe ---------- */
#k187mvg {
  --bs-offcanvas-bg: var(--k-panel);
  --bs-offcanvas-width: 18rem;
  border-right: 1px solid var(--k-line);
}
@media (min-width: 992px) {
  #k187mvg {
    position: sticky;
    top: 0;
    width: 17.5rem;
    height: 100vh;
    overflow-y: auto;
    background-image: linear-gradient(180deg, var(--k-panel) 0%, var(--k-bg) 100%);
  }
  #k187mvg .offcanvas-body { height: 100%; padding-top: 2.5rem !important; }
}
#k187mvg .offcanvas-body::after {
  content: '';
  display: block;
  margin-top: auto;
  width: 0.6rem;
  height: 0.6rem;
  background: var(--k-green);
  box-shadow: 0 0 12px var(--k-green);
  animation: k-blink 1.6s steps(2, start) infinite;
}
#kjoyuev { counter-reset: kn; }
#kjoyuev > .nav-item > .nav-link {
  --bs-nav-link-color: var(--k-text);
  --bs-nav-link-hover-color: var(--k-amber);
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  width: 100%;
  text-align: left;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.82rem;
  padding-block: 0.65rem;
  border-bottom: 1px dashed var(--k-line);
  text-decoration: none;
}
#kjoyuev > .nav-item > .nav-link::before {
  counter-increment: kn;
  content: counter(kn, decimal-leading-zero);
  color: var(--k-mute);
  font-size: 0.7rem;
  transition: color 0.2s;
}
#kjoyuev > .nav-item > .nav-link:hover::before { color: var(--k-amber); }
#kjoyuev > .nav-item > .nav-link:hover { padding-left: 0.4rem !important; }
#k1hhrhj .nav-link { --bs-nav-link-color: var(--k-mute); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.08em; }
#k1hhrhj .nav-link::before { content: '└ '; color: var(--k-line-2); }
#k9ld6lx { background: var(--k-bg); }
#k187mvg .input-group-text { background: var(--k-bg); color: var(--k-mute); border-color: var(--k-line-2); }
#k187mvg .form-control { border-color: var(--k-line-2); font-size: 0.8rem; }
#k187mvg .form-control:focus { border-color: var(--k-amber); box-shadow: none; }

/* ---------- Colonne de contenu ---------- */
#k1pdrjy { min-width: 0; }
main { counter-reset: ks; }

/* ---------- Hero accueil : titre display en vw ---------- */
#k1row2p {
  position: relative;
  background:
    radial-gradient(60% 70% at 50% 0%, rgba(245, 165, 36, 0.16), transparent 70%),
    radial-gradient(40% 50% at 85% 30%, rgba(139, 92, 246, 0.08), transparent 70%);
}
#k1row2p > div { min-height: min(62vh, 640px); display: flex; align-items: center; justify-content: center; }
#k1row2p h1 {
  max-width: 13ch;
  font-size: clamp(2.6rem, 8.2vw, 8.8rem);
  font-weight: 800;
  line-height: 0.95;
  letter-spacing: -0.06em;
  color: var(--k-cream);
}
#k1row2p h1 > span {
  background: linear-gradient(180deg, var(--k-cream) 35%, #8f98aa 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  padding-bottom: 0.06em;
  white-space: nowrap;
}
#k1row2p h1 > span:last-child::after {
  content: '';
  display: inline-block;
  width: 0.5em;
  height: 0.82em;
  margin-left: 0.12em;
  vertical-align: -0.06em;
  background: var(--k-amber);
  animation: k-blink 1.05s steps(2, start) infinite;
}
#k1row2p::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 2.2rem;
  width: 1px;
  height: 3rem;
  background: linear-gradient(var(--k-amber), transparent);
}

/* ---------- Ticker ---------- */
#k1qehii {
  background: var(--k-panel);
  border-color: var(--k-line) !important;
  font-family: var(--k-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
}
#k1qehii ul { animation: k-tick 32s linear infinite; }
#k1qehii:hover ul { animation-play-state: paused; }
#k1qehii li::before { content: '◆'; color: var(--k-amber); font-size: 0.55rem; margin-right: 1.5rem; }
#k1qehii a, #k1qehii li > span { color: var(--k-text); }
#k1qehii a:hover { color: var(--k-amber); }
#k1qehii [data-i] span:last-child { color: var(--k-green); }

/* ---------- Sections indexées [0n] ---------- */
main section > h2,
#ksffukv h1 {
  font-size: clamp(1.6rem, 3vw, 2.6rem);
  margin-bottom: 2rem;
}
#k1vaxmf, #k1lw54c, #ks9bvs9, #k9yqg73, #kok5flg { counter-increment: ks; }
#k1vaxmf > h2::before, #k1lw54c > h2::before, #ks9bvs9 > h2::before, #k9yqg73 > h2::before, #kok5flg > h2::before {
  content: '[' counter(ks, decimal-leading-zero) ']';
  display: block;
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--k-amber);
  margin-bottom: 0.75rem;
}
#k1lw54c, #kok5flg { border-top: 1px solid var(--k-line); }
#k15o6fm { border-top: 1px solid var(--k-line); }
@media (min-width: 992px) {
  #k9yqg73 { border-left: 1px solid var(--k-line); }
}

/* Cartes */
main .card {
  --bs-card-bg: var(--k-panel);
  --bs-card-border-color: var(--k-line);
  --bs-card-border-radius: 0;
  --bs-card-inner-border-radius: 0;
  --bs-card-spacer-y: 1.5rem;
  --bs-card-spacer-x: 1.5rem;
  position: relative;
  transition: transform 0.35s var(--k-ease), border-color 0.35s var(--k-ease), box-shadow 0.35s var(--k-ease);
}
main .card h3 { line-height: 1.25; }
main .card .card-text { color: var(--k-mute); font-size: 0.98rem; }
main .card::after,
#k1vaxmf .row::after {
  content: '';
  position: absolute;
  top: -1px;
  right: -1px;
  width: 1.4rem;
  height: 1.4rem;
  border-top: 2px solid var(--k-amber);
  border-right: 2px solid var(--k-amber);
  opacity: 0;
  transition: opacity 0.3s;
}
main .card:hover { transform: translateY(-4px); border-color: var(--k-line-2); box-shadow: 0 24px 48px -24px rgba(0, 0, 0, 0.8), 0 0 0 1px rgba(245, 165, 36, 0.15); }
main .card:hover::after, #k1vaxmf .row:hover::after { opacity: 1; }
main img[width='1280'] { aspect-ratio: 16 / 9; object-fit: cover; filter: grayscale(0.45) contrast(1.05) brightness(0.9); transition: filter 0.45s var(--k-ease); }
main .card:hover img, #k1vaxmf .row:hover img, #kok5flg li:hover img { filter: none; }

/* 01 — vedette */
#k1vaxmf .row { position: relative; background: var(--k-panel); border-color: var(--k-line) !important; }
#k1vaxmf .row h3 { font-size: clamp(1.4rem, 2.4vw, 2.2rem); line-height: 1.15; }
#k1vaxmf .row p { color: var(--k-mute); }
#k1vaxmf .row img { height: 100%; }

/* 05 — liste terminal */
#kok5flg ol { counter-reset: kl; }
#kok5flg li { border-color: var(--k-line) !important; transition: background-color 0.3s; position: relative; }
#kok5flg li:hover { background: rgba(245, 165, 36, 0.03); }
#kok5flg h3 { display: flex; gap: 0.8rem; }
#kok5flg h3::before { counter-increment: kl; content: '>' ; color: var(--k-amber); }
#kok5flg article p:not(.small) { color: var(--k-mute); }

/* Bloc SEO (plan) */
#kxbk80d { background: var(--k-panel); border-color: var(--k-line) !important; }
#kxbk80d .h4 { font-weight: 800; letter-spacing: -0.04em; font-size: 1.6rem; font-family: var(--k-mono); }
#kxbk80d a { color: var(--k-text); font-family: var(--k-mono); font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.06em; text-decoration: none; border-bottom: 1px solid var(--k-line-2); }
#kxbk80d a:hover { color: var(--k-amber); border-color: var(--k-amber); }

/* ---------- Footer : barre de statut ---------- */
#k1qh6gj {
  font-size: 0.8rem;
  color: var(--k-mute);
  background: var(--k-bg);
  border-color: var(--k-line) !important;
}
#k1qh6gj a { color: var(--k-text); text-decoration: none; }
#k1qh6gj a:hover { color: var(--k-amber); }
#k1qh6gj li { text-transform: uppercase; letter-spacing: 0.08em; }
#k1qh6gj .list-inline-item:not(:last-child)::after { content: '/'; color: var(--k-line-2); margin-left: 1.5rem; }
#k1qh6gj p.small.text-uppercase { color: var(--k-amber); letter-spacing: 0.15em; }
#k1qh6gj ul.list-unstyled li { padding-block: 0.25rem; }

/* ==========================================================================
   Page Bitcoin
   ========================================================================== */
#ksffukv {
  background: radial-gradient(50% 80% at 100% 0%, rgba(245, 165, 36, 0.12), transparent 70%);
}
#ksffukv h1 { font-size: clamp(2rem, 4.4vw, 4.2rem); line-height: 1.02; letter-spacing: -0.05em; font-weight: 800; margin-bottom: 0; }
#ksffukv [data-chip] { font-weight: 500; letter-spacing: 0.12em; padding: 0.5rem 0.7rem; border-color: var(--k-amber) !important; color: var(--k-amber); background: rgba(245, 165, 36, 0.06); }
#ksffukv [data-chip='algo']::before { content: '#'; opacity: 0.6; margin-right: 0.2rem; }
#ksffukv a.link-light { font-family: var(--k-mono); text-transform: uppercase; letter-spacing: 0.08em; text-decoration: none; border-bottom: 1px dashed var(--k-line-2); }
#ksffukv a.link-light::after { content: ' ↗'; color: var(--k-amber); }
[data-price] .display-5 { font-variant-numeric: tabular-nums; color: var(--k-cream); letter-spacing: -0.04em; }

/* Stats */
#k1lw2fp dl { border-color: var(--k-line) !important; background: var(--k-panel); }
#k1lw2fp dl > div + div { border-left: 1px solid var(--k-line); }
@media (max-width: 575.98px) { #k1lw2fp dl > div + div { border-left: 0; border-top: 1px solid var(--k-line); } }
#k1lw2fp dt { text-transform: uppercase; letter-spacing: 0.12em; font-size: 0.72rem; }
#k1lw2fp dd { color: var(--k-amber); font-variant-numeric: tabular-nums; letter-spacing: -0.03em; }

/* Plateformes */
#klqebu0 .list-group { --bs-list-group-bg: transparent; --bs-list-group-border-color: var(--k-line); --bs-list-group-action-hover-bg: rgba(245, 165, 36, 0.05); --bs-list-group-action-hover-color: var(--k-cream); border-color: var(--k-line) !important; }
#klqebu0 .list-group-item { transition: box-shadow 0.25s var(--k-ease), padding 0.25s var(--k-ease); }
#klqebu0 .list-group-item:hover { box-shadow: inset 3px 0 0 var(--k-amber); padding-left: 1.4rem; }
#klqebu0 [data-i]::before,
#k1qehii [data-i]::before {
  content: attr(data-i);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-family: var(--k-mono);
  font-weight: 800;
  color: var(--k-bg);
  background: var(--k-amber);
}
#klqebu0 [data-i]::before { width: 3rem; height: 3rem; font-size: 1.2rem; }
#k1qehii [data-i]::before { width: 1.3rem; height: 1.3rem; font-size: 0.65rem; border-radius: 50%; background: var(--k-cream); }
#klqebu0 .fs-5 { font-family: var(--k-mono); }

/* Convertisseur */
#kpo1sqs { background: var(--k-panel); border-color: var(--k-line) !important; position: relative; }
#kpo1sqs::before { content: ''; position: absolute; top: -1px; left: -1px; width: 3rem; height: 3px; background: var(--k-amber); }
#kpo1sqs > div { border-color: var(--k-line) !important; color: var(--k-amber); }
#kpo1sqs .form-control { background: transparent; border: 0; border-bottom: 2px solid var(--k-amber); font-weight: 700; color: var(--k-cream); padding-inline: 0; font-variant-numeric: tabular-nums; }
#kpo1sqs .form-control:focus { box-shadow: none; border-color: var(--k-cream); }
#kpo1sqs .bi { color: var(--k-mute); }
@media (min-width: 1200px) { #kpo1sqs { flex-direction: column; } #kpo1sqs > * { width: 100%; } #kpo1sqs > div { border-left: 0 !important; border-right: 0 !important; border-top: 1px solid var(--k-line); border-bottom: 1px solid var(--k-line); } }

/* Article + sommaire sticky (scrollspy) */
#k1jg4gv { border-color: var(--k-line) !important; }
#k14g2su { top: 2rem; border-left: 1px solid var(--k-line); padding-left: 1rem; }
#k14g2su .nav-link { --bs-nav-link-color: var(--k-mute); --bs-nav-link-hover-color: var(--k-cream); font-size: 0.78rem; line-height: 1.4; padding-block: 0.45rem; position: relative; }
#k14g2su .nav-link.active { color: var(--k-amber); }
#k14g2su .nav-link.active::before { content: ''; position: absolute; left: -1.05rem; top: 0; bottom: 0; width: 2px; background: var(--k-amber); }
#k1jg4gv article { font-size: 1.125rem; line-height: 1.85; }
#k1jg4gv article p { max-width: 68ch; color: #cfd5e0; }
#k1jg4gv article h2 { margin-top: 1rem; }
#k1jg4gv article h3 { font-size: 1.15rem; color: var(--k-amber-2); margin-top: 1.5rem; }
#k1jg4gv article h3::before { content: '## '; color: var(--k-line-2); }
#k1jg4gv article b { color: var(--k-cream); }
#khks2hl, #k1mmvel, #k1mmvel > section { scroll-margin-top: 5rem; }

/* ---------- Motion ---------- */
@keyframes k-blink { to { visibility: hidden; } }
@keyframes k-tick { from { transform: translateX(0); } to { transform: translateX(-100%); } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

/* ---------- Responsive ---------- */
@media (max-width: 991.98px) {
  #k1row2p > div { min-height: 48vh; }
  main section > h2 { margin-bottom: 1.4rem; }
}
@media (max-width: 575.98px) {
  #k1row2p h1 { font-size: clamp(2rem, 10.4vw, 3.4rem); }
  #ksffukv h1 { font-size: 1.9rem; }
  [data-price] .display-5 { font-size: 2.2rem; }
}