:root {
  --bg: #f7f7f8;
  --surface: #ffffff;
  --surface-soft: #f0f1f3;
  --text: #1d1e22;
  --muted: #666a73;
  --border: #d8dae0;
  --accent: #5c43d6;
  --accent-dark: #4530b8;
  --shadow: 0 18px 45px rgba(24, 25, 30, .10);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color-scheme: light dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--text); line-height: 1.55; }
a { color: inherit; }
button, input, select { font: inherit; }
.shell { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.narrow { width: min(760px, 100%); }
.centered { text-align: center; margin-inline: auto; }

.site-header { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.92); border-bottom: 1px solid var(--border); backdrop-filter: blur(14px); }
.header-inner { min-height: 78px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.brand-mark { width: 42px; height: 42px; border-radius: 50%; background: conic-gradient(#ff595e, #ffca3a, #8ac926, #1982c4, #6a4c93, #ff595e); box-shadow: inset 0 0 0 6px white; }
.brand strong, .brand small { display: block; }
.brand small { color: var(--muted); font-size: .78rem; }
.main-nav { display: flex; align-items: center; gap: 18px; }
.main-nav a { text-decoration: none; font-weight: 700; }
.language-link { padding: 7px 10px; border: 1px solid var(--border); border-radius: 8px; }

.hero { padding: 90px 0 70px; }
.hero-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 70px; align-items: center; }
.eyebrow { color: var(--accent); font-size: .8rem; font-weight: 800; letter-spacing: .12em; }
h1 { font-size: clamp(2.4rem, 6vw, 4.7rem); line-height: 1.02; margin: 16px 0 22px; }
h2 { font-size: clamp(1.8rem, 4vw, 2.7rem); line-height: 1.1; }
.hero-copy { max-width: 680px; color: var(--muted); font-size: 1.16rem; }
.button { display: inline-flex; justify-content: center; align-items: center; min-height: 46px; padding: 12px 18px; border: 0; border-radius: 10px; text-decoration: none; font-weight: 800; cursor: pointer; }
.button.primary { background: var(--accent); color: #fff; }
.button.primary:hover { background: var(--accent-dark); }
.button.secondary { background: var(--surface-soft); }
.button.full { width: 100%; margin-top: 14px; }
.hero-demo { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 18px; padding: 22px; background: var(--surface); border: 1px solid var(--border); border-radius: 20px; box-shadow: var(--shadow); }
.demo-color { aspect-ratio: 1; display: grid; place-items: center; border-radius: 16px; color: white; text-shadow: 0 1px 3px rgba(0,0,0,.65); }
.original-demo { background: #523611; }
.short-demo { background: #553311; }
.demo-arrow { font-size: 2rem; font-weight: 900; }

.section { padding: 72px 0; }
.soft-section { background: var(--surface-soft); }
.tool-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 22px; margin-top: 30px; }
.tool-card { padding: 28px; background: var(--surface); border: 1px solid var(--border); border-radius: 16px; box-shadow: 0 10px 25px rgba(24,25,30,.05); }
.tool-icon { width: 48px; height: 48px; display: grid; place-items: center; border-radius: 12px; background: var(--accent); color: #fff; font: 900 1.5rem monospace; }
.tool-card h3 { font-size: 1.35rem; margin-bottom: 8px; }
.tool-card p { color: var(--muted); }
.two-column { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.feature-list { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; padding: 0; list-style: none; }
.feature-list li { padding: 16px; background: var(--surface); border-radius: 12px; font-weight: 700; }

.site-footer { padding: 38px 0; border-top: 1px solid var(--border); background: var(--surface); }
.footer-inner { display: grid; grid-template-columns: 1fr auto auto; gap: 30px; align-items: center; }
.footer-inner p { margin: 4px 0 0; color: var(--muted); }
.footer-links { display: flex; gap: 14px; }

.tool-hero { padding: 70px 0 25px; text-align: center; }
.tool-hero h1 { font-size: clamp(2rem, 5vw, 3.6rem); }
.tool-section { padding-top: 30px; overflow-x: clip; }
.tool-shell { max-width: 760px; }
.converter-app { padding: 28px; background: var(--surface); border: 1px solid var(--border); border-radius: 18px; box-shadow: var(--shadow); }
.converter-message { margin-bottom: 18px; padding: 12px 14px; border-radius: 10px; background: var(--surface-soft); }
.converter-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.color-card { position: relative; border: 1px solid var(--border); border-radius: 14px; background: var(--surface); overflow: visible; }
.large-color-preview { width: 100%; height: 150px; border: 0; border-radius: 14px 14px 0 0; cursor: pointer; position: relative; }
.large-color-preview span { position: absolute; left: 50%; bottom: 12px; transform: translateX(-50%); background: rgba(0,0,0,.55); color: white; border-radius: 999px; padding: 6px 10px; font-weight: 800; opacity: 0; transition: opacity .2s; white-space: nowrap; }
.large-color-preview:hover span, .large-color-preview:focus-visible span { opacity: 1; }
.field-wrap { padding: 14px; }
.field-wrap label { display: block; margin-bottom: 7px; font-weight: 800; }
.field-wrap input[type="text"] { width: 100%; padding: 12px; border: 1px solid var(--border); border-radius: 9px; text-align: center; font: 800 1rem monospace; text-transform: uppercase; background: var(--surface); color: var(--text); }
.hint { margin-top: 7px; color: var(--muted); font-size: .84rem; }
.converter-error { min-height: 1.4em; margin-top: 12px; color: #a40000; font-weight: 800; }

.picker-panel { position: absolute; top: 0; z-index: 30; width: 235px; padding: 14px; border: 1px solid var(--border); border-radius: 12px; background: var(--surface); box-shadow: var(--shadow); }
.picker-panel[hidden] { display: none; }
.picker-left { right: calc(100% + 12px); }
.picker-right { left: calc(100% + 12px); }
.picker-panel h2 { margin: 0 0 12px; font-size: 1rem; }
.picker-top { display: grid; grid-template-columns: 1fr 52px; gap: 10px; margin-bottom: 12px; }
.picker-preview { height: 46px; border: 1px solid var(--border); border-radius: 8px; }
.native-picker-wrap { position: relative; width: 52px; height: 46px; }
.palette-button { width: 52px; height: 46px; border: 1px solid var(--border); border-radius: 8px; background: var(--surface); font-size: 1.45rem; }
.native-picker { position: absolute; inset: 0; width: 52px; height: 46px; opacity: 0; cursor: pointer; }
.picker-row { display: grid; grid-template-columns: 22px 1fr 42px; gap: 8px; align-items: center; margin-bottom: 10px; }
.picker-row input { width: 100%; }
.picker-row output { text-align: right; font: 800 .85rem monospace; }
.picker-actions { display: flex; gap: 8px; margin-top: 12px; }
.picker-actions button { flex: 1; padding: 8px; border: 0; border-radius: 8px; font-weight: 800; cursor: pointer; }
.picker-apply { background: var(--text); color: var(--surface); }
.picker-cancel { background: var(--surface-soft); color: var(--text); }

@media (max-width: 1200px) {
  .picker-left, .picker-right { left: 12px; right: auto; top: 12px; }
}
@media (max-width: 760px) {
  .header-inner, .footer-inner { grid-template-columns: 1fr; }
  .header-inner { align-items: flex-start; padding: 14px 0; }
  .main-nav { flex-wrap: wrap; }
  .hero-grid, .two-column, .converter-grid { grid-template-columns: 1fr; }
  .hero { padding-top: 55px; }
  .feature-list { grid-template-columns: 1fr; }
  .footer-inner { display: grid; }
}

@media (prefers-color-scheme: dark) {
  :root { --bg: #17181b; --surface: #222328; --surface-soft: #2d2f35; --text: #f3f3f5; --muted: #b0b2ba; --border: #3c3e45; --shadow: 0 18px 45px rgba(0,0,0,.35); }
  .site-header { background: rgba(34,35,40,.92); }
  .brand-mark { box-shadow: inset 0 0 0 6px #222328; }
  .picker-apply { background: #f3f3f5; color: #222328; }
  .converter-error { color: #ff9494; }
}

/*
 * À ajouter à la fin de assets/css/main.css
 */

.tool-explanation {
    max-width: 820px;
    margin: 3rem auto 0;
    padding-top: 2rem;
    border-top: 1px solid rgba(127, 127, 127, 0.28);
    line-height: 1.7;
}

.tool-explanation h2 {
    margin: 0 0 1rem;
    font-size: clamp(1.35rem, 2.5vw, 1.75rem);
    line-height: 1.25;
}

.tool-explanation h2:not(:first-child) {
    margin-top: 2.25rem;
}

.tool-explanation p {
    margin: 0 0 1rem;
}

.tool-explanation ul {
    margin: 0 0 1.25rem;
    padding-left: 1.35rem;
}

.tool-explanation li + li {
    margin-top: 0.45rem;
}

.tool-explanation code {
    padding: 0.12em 0.35em;
    border-radius: 0.3rem;
    background: rgba(127, 127, 127, 0.16);
    font-size: 0.95em;
}

.tool-explanation-section {
  padding-top: 0;
}

.tool-explanation {
  padding-top: 2rem;
  border-top: 1px solid rgba(127, 127, 127, 0.28);
  line-height: 1.7;
}

.tool-explanation h2 {
  margin: 0 0 1rem;
  font-size: clamp(1.35rem, 2.5vw, 1.75rem);
  line-height: 1.25;
}

.tool-explanation h2:not(:first-child) {
  margin-top: 2.25rem;
}

.tool-explanation p {
  margin: 0 0 1rem;
}

.tool-explanation ul {
  margin: 0 0 1.25rem;
  padding-left: 1.35rem;
}

.tool-explanation li + li {
  margin-top: 0.45rem;
}

.tool-explanation code {
  padding: 0.12em 0.35em;
  border-radius: 0.3rem;
  background: rgba(127, 127, 127, 0.16);
  font-size: 0.95em;
}