/* Échecs360 — feuille de style unique des pages publiques (landing, blog, auth).
   Thème sombre inspiré des plateformes d'échecs : fond #262421, accent #81b64c. */

:root {
  --bg: #262421;
  --panel: #2b2926;
  --panel-2: #21201d;
  --text: #e8e6e3;
  --muted: #a9a59e;
  --accent: #81b64c;
  --accent-dark: #6a9a3d;
  --border: #3d3a36;
  --light-sq: #ebecd0;
  --dark-sq: #739552;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.65;
}

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

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

.container { max-width: 1080px; margin: 0 auto; padding: 0 20px; }

/* ---------- En-tête ---------- */
.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--panel-2);
  position: sticky; top: 0; z-index: 10;
}
.site-header .container {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 60px; gap: 16px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 800; font-size: 1.25rem; color: var(--text);
}
.brand:hover { text-decoration: none; }
.brand .logo {
  width: 34px; height: 34px; border-radius: 7px; flex: none;
  background: conic-gradient(var(--light-sq) 0 25%, var(--dark-sq) 0 50%,
              var(--light-sq) 0 75%, var(--dark-sq) 0);
}
.brand em { color: var(--accent); font-style: normal; }
.site-nav { display: flex; align-items: center; gap: 18px; }
.site-nav a { color: var(--text); font-weight: 600; font-size: .95rem; }
.btn {
  display: inline-block; padding: 10px 20px; border-radius: 8px;
  font-weight: 700; border: none; cursor: pointer; font-size: 1rem;
}
.btn-primary { background: var(--accent); color: #1c2514; box-shadow: 0 3px 0 var(--accent-dark); }
.btn-primary:hover { filter: brightness(1.06); text-decoration: none; }
.btn-ghost { background: transparent; color: var(--text); border: 1.5px solid var(--border); }
.btn-ghost:hover { border-color: var(--muted); text-decoration: none; }

/* ---------- Hero ---------- */
.hero { padding: 72px 0 56px; }
.hero .container { display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px; align-items: center; }
.hero h1 { font-size: 2.7rem; line-height: 1.15; margin: 0 0 16px; }
.hero h1 em { color: var(--accent); font-style: normal; }
.hero p.lead { color: var(--muted); font-size: 1.15rem; margin: 0 0 28px; }
.hero .actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* Mini échiquier décoratif du hero (pur CSS, aucun JS) */
.hero-board {
  aspect-ratio: 1; border-radius: 10px; overflow: hidden;
  box-shadow: 0 20px 50px rgba(0,0,0,.45);
  display: grid; grid-template-columns: repeat(8, 1fr); grid-template-rows: repeat(8, 1fr);
}
.hero-board span { background: var(--light-sq); display: flex; align-items: center; justify-content: center; }
.hero-board span.d { background: var(--dark-sq); }
.hero-board span.hl { background: #f5f682; }
.hero-board svg { width: 78%; height: 78%; }

/* ---------- Sections ---------- */
.section { padding: 56px 0; }
.section-alt { background: var(--panel-2); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section h2 { font-size: 1.8rem; margin: 0 0 8px; }
.section .sub { color: var(--muted); margin: 0 0 32px; }

.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feature {
  background: var(--panel); border: 1px solid var(--border); border-radius: 12px;
  padding: 24px;
}
.feature .icon {
  width: 46px; height: 46px; border-radius: 10px; background: rgba(129,182,76,.14);
  display: flex; align-items: center; justify-content: center; margin-bottom: 14px;
}
.feature .icon svg { width: 26px; height: 26px; fill: var(--accent); }
.feature h3 { margin: 0 0 8px; font-size: 1.12rem; }
.feature p { margin: 0; color: var(--muted); font-size: .95rem; }

/* ---------- Cartes d'articles ---------- */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card {
  background: var(--panel); border: 1px solid var(--border); border-radius: 12px;
  padding: 22px; display: flex; flex-direction: column; gap: 8px;
}
.card time { color: var(--muted); font-size: .82rem; }
.card h3 { margin: 0; font-size: 1.08rem; line-height: 1.4; }
.card h3 a { color: var(--text); }
.card p { margin: 0; color: var(--muted); font-size: .92rem; flex: 1; }
.card .tags { display: flex; gap: 6px; flex-wrap: wrap; }
.tag {
  font-size: .74rem; font-weight: 700; padding: 3px 9px; border-radius: 99px;
  background: rgba(129,182,76,.14); color: var(--accent);
}

/* ---------- Blog : liste et pagination ---------- */
.page-title { padding: 48px 0 8px; }
.page-title h1 { margin: 0 0 6px; font-size: 2.1rem; }
.page-title p { color: var(--muted); margin: 0; }
.blog-list { padding: 32px 0 56px; }
.pagination { display: flex; gap: 10px; justify-content: center; margin-top: 36px; }
.pagination a, .pagination span {
  padding: 8px 16px; border-radius: 8px; border: 1.5px solid var(--border);
  color: var(--text); font-weight: 600;
}
.pagination .current { background: var(--accent); border-color: var(--accent); color: #1c2514; }

/* ---------- Article ---------- */
.article-layout { display: grid; grid-template-columns: 1fr 260px; gap: 44px; padding: 40px 0 64px; }
article.post h1 { font-size: 2.2rem; line-height: 1.2; margin: 0 0 10px; }
.post-meta { color: var(--muted); font-size: .9rem; margin-bottom: 28px; display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.post-body h2 { font-size: 1.45rem; margin: 36px 0 12px; scroll-margin-top: 80px; }
.post-body p { margin: 0 0 16px; }
.post-body ul { padding-left: 22px; }
.post-body li { margin-bottom: 6px; }
.post-body strong { color: #fff; }
.toc {
  position: sticky; top: 84px; align-self: start;
  background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 18px 20px;
}
.toc h2 { font-size: .85rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); margin: 0 0 10px; }
.toc ol { margin: 0; padding-left: 18px; }
.toc li { margin-bottom: 7px; font-size: .92rem; }
.related { padding: 0 0 64px; }
.related h2 { font-size: 1.4rem; margin: 0 0 20px; }

/* ---------- Formulaires auth ---------- */
.auth-wrap { max-width: 420px; margin: 56px auto 80px; padding: 0 20px; }
.auth-card { background: var(--panel); border: 1px solid var(--border); border-radius: 14px; padding: 32px; }
.auth-card h1 { margin: 0 0 22px; font-size: 1.6rem; text-align: center; }
.field { margin-bottom: 18px; }
.field label { display: block; font-weight: 600; font-size: .92rem; margin-bottom: 7px; }
.field input[type="email"], .field input[type="text"], .field input[type="password"] {
  width: 100%; padding: 12px 14px; border-radius: 8px; font-size: 1rem;
  border: 1.5px solid var(--border); background: var(--panel-2); color: var(--text);
}
.field input:focus { outline: none; border-color: var(--accent); }
.field .error { color: #e07470; font-size: .85rem; margin-top: 5px; }
.checkbox { display: flex; align-items: center; gap: 8px; margin-bottom: 18px; font-size: .92rem; color: var(--muted); }
.auth-card .btn { width: 100%; }
.auth-alt { text-align: center; margin-top: 18px; font-size: .92rem; color: var(--muted); }
.alert { border-radius: 8px; padding: 12px 16px; margin-bottom: 18px; font-size: .92rem; }
.alert-error { background: rgba(224,116,112,.12); border: 1px solid rgba(224,116,112,.4); color: #e07470; }
.alert-success { background: rgba(129,182,76,.12); border: 1px solid rgba(129,182,76,.4); color: var(--accent); }

/* ---------- Pied de page ---------- */
.site-footer { border-top: 1px solid var(--border); background: var(--panel-2); padding: 36px 0; margin-top: 24px; }
.site-footer .container { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.site-footer p { margin: 0; color: var(--muted); font-size: .9rem; }
.site-footer nav { display: flex; gap: 18px; flex-wrap: wrap; }
.site-footer a { color: var(--muted); font-size: .9rem; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .hero .container { grid-template-columns: 1fr; }
  .hero-board { max-width: 380px; margin: 0 auto; }
  .features, .cards { grid-template-columns: 1fr; }
  .article-layout { grid-template-columns: 1fr; }
  .toc { position: static; order: -1; }
  .hero h1 { font-size: 2.1rem; }
}