:root {
  --bg: #0f172a;
  --bg2: #1e293b;
  --bg3: #0f172a;
  --accent: #6366f1;
  --accent2: #818cf8;
  --text: #e2e8f0;
  --text2: #94a3b8;
  --border: rgba(255,255,255,.08);
  --radius: 16px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* ── Nav ── */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(15,23,42,.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav__inner {
  max-width: 1100px; margin: 0 auto;
  padding: .875rem 1.5rem;
  display: flex; align-items: center; justify-content: space-between;
}
.nav__logo {
  display: flex; align-items: center; gap: .5rem;
  text-decoration: none; color: var(--text); font-weight: 700; font-size: 1rem;
}
.nav__logo-img { width: 32px; height: 32px; border-radius: 8px; object-fit: cover; }
.nav__links { display: flex; gap: 1.5rem; align-items: center; }
.nav__links a {
  color: var(--text2); text-decoration: none; font-size: .9rem; transition: color .2s;
}
.nav__links a:hover, .nav__links a.active { color: var(--text); }
.nav__links a.nav__blog-active { color: var(--accent2); font-weight: 600; }

/* ── Blog index hero ── */
.blog-hero {
  padding: 5rem 1.5rem 2.5rem; text-align: center;
}
.blog-hero .section__tag {
  display: inline-block;
  background: rgba(99,102,241,.15); color: var(--accent2);
  border: 1px solid rgba(99,102,241,.3); border-radius: 100px;
  padding: .25rem .875rem; font-size: .78rem; font-weight: 600;
  letter-spacing: .06em; text-transform: uppercase; margin-bottom: 1rem;
}
.blog-hero h1 {
  font-size: clamp(2rem, 5vw, 3rem); font-weight: 800;
  margin-bottom: 1rem; line-height: 1.15;
}
.blog-hero p { color: var(--text2); max-width: 560px; margin: 0 auto; font-size: 1.05rem; }

/* ── Blog grid ── */
.blog-grid {
  max-width: 1100px; margin: 0 auto;
  padding: 2rem 1.5rem 5rem;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(310px, 1fr)); gap: 1.5rem;
}

.blog-card {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.5rem;
  display: flex; flex-direction: column; gap: .75rem;
  text-decoration: none; color: var(--text);
  transition: border-color .2s, transform .2s;
}
.blog-card:hover { border-color: rgba(99,102,241,.4); transform: translateY(-3px); }
.blog-card__tag {
  font-size: .72rem; font-weight: 700; color: var(--accent2);
  text-transform: uppercase; letter-spacing: .07em;
}
.blog-card h2 { font-size: 1.1rem; font-weight: 700; line-height: 1.4; }
.blog-card p { color: var(--text2); font-size: .88rem; line-height: 1.65; flex: 1; }
.blog-card__meta { font-size: .78rem; color: var(--text2); display: flex; gap: 1rem; }
.blog-card__read { color: var(--accent2); font-size: .83rem; font-weight: 600; }

/* ── Article page ── */
.article-wrap { max-width: 760px; margin: 0 auto; padding: 0 1.5rem; }

.article-hero { padding: 4rem 1.5rem 2rem; max-width: 760px; margin: 0 auto; }
.article-hero__tag {
  display: inline-block;
  background: rgba(99,102,241,.15); color: var(--accent2);
  border: 1px solid rgba(99,102,241,.3); border-radius: 100px;
  padding: .25rem .875rem; font-size: .78rem; font-weight: 600;
  letter-spacing: .06em; text-transform: uppercase; margin-bottom: 1rem;
}
.article-hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.4rem); font-weight: 800;
  line-height: 1.2; margin-bottom: 1rem;
}
.article-hero__intro {
  color: var(--text2); font-size: 1.05rem; line-height: 1.75; margin-bottom: 1.25rem;
}
.article-hero__meta { font-size: .82rem; color: var(--text2); display: flex; gap: 1.5rem; flex-wrap: wrap; }

.article-body { max-width: 760px; margin: 0 auto; padding: 2rem 1.5rem 5rem; }
.article-body h2 {
  font-size: 1.35rem; font-weight: 700; margin: 2.5rem 0 .875rem; color: var(--text);
  border-left: 3px solid var(--accent); padding-left: .875rem;
}
.article-body h3 { font-size: 1.05rem; font-weight: 600; margin: 1.75rem 0 .625rem; color: var(--text); }
.article-body p { color: var(--text2); margin-bottom: 1.25rem; line-height: 1.85; }
.article-body ul, .article-body ol {
  color: var(--text2); margin: 0 0 1.25rem 1.5rem; line-height: 1.8;
}
.article-body li { margin-bottom: .5rem; }
.article-body strong { color: var(--text); font-weight: 600; }
.highlight-box {
  background: var(--bg2); border: 1px solid var(--border);
  border-left: 3px solid var(--accent); border-radius: 0 12px 12px 0;
  padding: 1.25rem 1.5rem; margin: 1.75rem 0;
}
.highlight-box p { margin: 0; }

.cta-box {
  background: linear-gradient(135deg, rgba(99,102,241,.12), rgba(99,102,241,.04));
  border: 1px solid rgba(99,102,241,.25); border-radius: var(--radius);
  padding: 2rem 1.75rem; margin-top: 3rem; text-align: center;
}
.cta-box h3 { font-size: 1.25rem; margin-bottom: .75rem; }
.cta-box p { color: var(--text2); margin-bottom: 1.5rem; }

.back-link {
  display: inline-flex; align-items: center; gap: .4rem;
  color: var(--text2); text-decoration: none; font-size: .88rem;
  margin-bottom: 2rem; transition: color .2s;
}
.back-link:hover { color: var(--text); }

.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .75rem 1.5rem; border-radius: 10px;
  font-weight: 600; font-size: .93rem; text-decoration: none; transition: all .2s;
}
.btn--primary { background: var(--accent); color: #fff; }
.btn--primary:hover { background: #4f46e5; }
.btn--ghost { border: 1px solid var(--border); color: var(--text); }
.btn--ghost:hover { border-color: rgba(255,255,255,.2); }

/* ── Footer ── */
.footer { border-top: 1px solid var(--border); padding: 2rem 1.5rem; }
.footer__inner {
  max-width: 1100px; margin: 0 auto;
  display: flex; flex-direction: column; align-items: center; gap: .875rem; text-align: center;
}
.footer__brand { display: flex; align-items: center; gap: .5rem; font-weight: 700; }
.footer__copy { font-size: .82rem; color: var(--text2); }

@media (max-width: 640px) {
  .blog-grid { grid-template-columns: 1fr; }
  .nav__links { gap: .875rem; font-size: .82rem; }
}