/* MES AI — GitHub Pages stylesheet */
:root {
  --blue:    #1d4ed8;
  --blue-lt: #3b82f6;
  --gray-50: #f9fafb;
  --gray-100:#f3f4f6;
  --gray-200:#e5e7eb;
  --gray-700:#374151;
  --gray-900:#111827;
  --green:   #16a34a;
  --radius:  6px;
  --shadow:  0 1px 4px rgba(0,0,0,.10);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--gray-700);
  background: #fff;
  line-height: 1.65;
}

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

/* ── Navigation ─────────────────────────────────────────────── */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--gray-900);
  padding: .75rem 2rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  overflow-x: auto;
  white-space: nowrap;
}

nav .logo {
  font-weight: 700;
  font-size: 1.1rem;
  color: #fff;
  white-space: nowrap;
}

nav .logo span { color: var(--blue-lt); }

nav a {
  color: #d1d5db;
  font-size: .92rem;
}

nav a:hover, nav a.active { color: #fff; text-decoration: none; }

nav a.nav-blog {
  background: var(--blue-lt);
  color: #fff;
  padding: .3rem .85rem;
  border-radius: var(--radius);
  font-weight: 600;
}

nav a.nav-blog:hover { background: #2563eb; text-decoration: none; }

/* ── Hero ────────────────────────────────────────────────────── */
.hero {
  background: linear-gradient(135deg, #1e3a5f 0%, #1d4ed8 100%);
  color: #fff;
  padding: 5rem 2rem 4rem;
  text-align: center;
}

.hero h1 { font-size: 2.8rem; font-weight: 800; line-height: 1.15; }
.hero h1 span { color: #93c5fd; }
.hero p  { font-size: 1.15rem; margin-top: 1rem; max-width: 680px; margin-left: auto; margin-right: auto; opacity: .9; }

.btn {
  display: inline-block;
  margin-top: 1.75rem;
  padding: .65rem 1.6rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: .95rem;
  cursor: pointer;
}

.btn-primary { background: #fff; color: var(--blue); }
.btn-primary:hover { background: #e0e7ff; text-decoration: none; }
.btn-outline  { border: 2px solid rgba(255,255,255,.6); color: #fff; margin-left: .75rem; }
.btn-outline:hover { border-color: #fff; text-decoration: none; }
.btn-download { border: 2px solid #6ee7b7; color: #6ee7b7; margin-left: .75rem; }
.btn-download:hover { background: rgba(110,231,183,.15); border-color: #a7f3d0; text-decoration: none; }

/* ── Badges ─────────────────────────────────────────────────── */
.badges { display: flex; gap: .5rem; justify-content: center; margin-top: 1.25rem; flex-wrap: wrap; }
.badge  { padding: .25rem .75rem; border-radius: 999px; font-size: .78rem; font-weight: 600; }
.badge-blue   { background: rgba(255,255,255,.15); color: #bfdbfe; }
.badge-green  { background: rgba(255,255,255,.15); color: #86efac; }

/* ── Layout container ───────────────────────────────────────── */
.container { max-width: 960px; margin: 0 auto; padding: 0 2rem; }

/* ── Sections ───────────────────────────────────────────────── */
section { padding: 4rem 0 2rem; }
section + section { border-top: 1px solid var(--gray-200); }

h2 { font-size: 1.65rem; font-weight: 700; color: var(--gray-900); margin-bottom: 1rem; }
h3 { font-size: 1.15rem; font-weight: 700; color: var(--gray-900); margin-bottom: .5rem; }
p  { margin-bottom: 1rem; }

ul { margin: .5rem 0 1rem 1.25rem; }
ul li { margin-bottom: .35rem; }

/* ── Feature cards ──────────────────────────────────────────── */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.25rem; margin-top: 1.5rem; }

.card {
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 1.5rem;
  background: var(--gray-50);
}

.card-icon { font-size: 1.75rem; margin-bottom: .75rem; }
.card h3 { font-size: 1rem; }

/* ── Stack pills ─────────────────────────────────────────────── */
.pills { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: .75rem; }
.pill  { background: var(--gray-100); border: 1px solid var(--gray-200); border-radius: 999px; padding: .2rem .7rem; font-size: .8rem; color: var(--gray-700); }

/* ── Architecture images ─────────────────────────────────────── */
.arch-img { width: 100%; max-width: 860px; display: block; margin: 1.5rem auto; border: 1px solid var(--gray-200); border-radius: var(--radius); box-shadow: var(--shadow); }
.arch-caption { text-align: center; font-size: .85rem; color: #6b7280; margin-top: .5rem; margin-bottom: 2rem; }

/* ── Blog listing ─────────────────────────────────────────────── */
.post-list { list-style: none; margin: 1.5rem 0 0; padding: 0; }

.post-item {
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
  background: var(--gray-50);
  transition: box-shadow .15s;
}
.post-item:hover { box-shadow: var(--shadow); }

.post-meta { font-size: .82rem; color: #6b7280; margin-bottom: .4rem; }
.post-item h3 { font-size: 1.1rem; margin-bottom: .4rem; }
.post-item p  { margin: 0; font-size: .95rem; }
.post-tag { display: inline-block; background: #dbeafe; color: #1e40af; font-size: .75rem; padding: .15rem .55rem; border-radius: 999px; margin-left: .5rem; font-weight: 600; }

/* ── Blog article ─────────────────────────────────────────────── */
.article { max-width: 740px; margin: 0 auto; padding: 3rem 2rem; }
.article h1 { font-size: 2rem; font-weight: 800; color: var(--gray-900); margin-bottom: .5rem; }
.article .article-meta { font-size: .87rem; color: #6b7280; margin-bottom: 2rem; border-bottom: 1px solid var(--gray-200); padding-bottom: 1rem; }
.article h2 { font-size: 1.35rem; margin-top: 2rem; margin-bottom: .6rem; }
.article h3 { font-size: 1.1rem;  margin-top: 1.5rem; margin-bottom: .4rem; }
.article p  { margin-bottom: 1.1rem; }
.article ul, .article ol { margin: .5rem 0 1.1rem 1.5rem; }
.article li { margin-bottom: .35rem; }
.article pre {
  background: var(--gray-900);
  color: #e5e7eb;
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
  overflow-x: auto;
  margin-bottom: 1.1rem;
  font-size: .9rem;
}
.article code { font-family: "JetBrains Mono", "Fira Code", "Cascadia Code", Consolas, monospace; font-size: .9em; }
.article :not(pre) > code { background: var(--gray-100); padding: .15rem .4rem; border-radius: 3px; }

/* ── Footer ──────────────────────────────────────────────────── */
footer {
  background: var(--gray-900);
  color: #9ca3af;
  text-align: center;
  padding: 2rem 1rem;
  font-size: .88rem;
  margin-top: 4rem;
}

footer a { color: #93c5fd; }

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width: 640px) {
  .hero h1 { font-size: 2rem; }
  nav { gap: 1rem; padding: .75rem 1rem; }
}