/* blog.css – Skills4AI Blog Stylesheet
   Design-Tokens: identisch zur React SPA (exakte HSL-Werte, Poppins, 0.75rem radius)
   Stand: 2026-03-27 */

:root {
  /* Exakt aus SPA-CSS-Bundle extrahiert */
  --primary:        hsl(187, 100%, 32%);
  --primary-hover:  hsl(187, 100%, 28%);
  --primary-light:  hsl(187, 50%, 85%);
  --primary-bg:     hsl(187, 60%, 94%);
  --foreground:     hsl(220, 15%, 15%);   /* = SPA footer-Hintergrund */
  --nav-bg:         rgba(255, 255, 255, 0.95);
  --white:          #ffffff;
  --gray-50:        hsl(220, 8%, 98%);
  --gray-100:       hsl(220, 10%, 95%);
  --gray-200:       hsl(220, 10%, 90%);
  --gray-300:       hsl(220, 10%, 80%);
  --gray-400:       hsl(220, 10%, 60%);
  --gray-500:       hsl(220, 10%, 50%);
  --gray-700:       hsl(220, 15%, 35%);
  --gray-900:       hsl(220, 15%, 15%);
  --font:           'Poppins', sans-serif;
  --radius:         0.75rem;
  --max-w:          780px;
  --max-w-wide:     1152px;             /* = max-w-6xl in Tailwind */
  --shadow-card:    0 2px 8px 0 hsl(220 15% 15% / .06), 0 1px 3px 0 hsl(220 15% 15% / .1);
  --shadow-btn:     0 4px 12px 0 hsl(187 100% 32% / .15), 0 2px 4px 0 hsl(187 100% 32% / .1);
  --shadow-glow:    0 0 0 1px hsl(187 100% 32% / .1), 0 8px 32px 0 hsl(187 100% 32% / .12);
  --shadow-md:      0 4px 24px rgba(0,0,0,.12);
}

/* === Reset === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  color: var(--gray-900);
  background: var(--white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-hover); }

/* === Navigation (weiß, Frosted Glass – identisch zur Hauptseite) === */
.blog-nav {
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--gray-200);
  box-shadow: 0 1px 4px rgba(0, 0, 0, .06);
  position: sticky;
  top: 0;
  z-index: 200;
}
.blog-nav-inner {
  max-width: var(--max-w-wide);
  margin: 0 auto;
  padding: 0 2rem;
  height: 72px;          /* = SPA py-5 (20px oben+unten) + Logo */
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.blog-nav-logo {
  flex-shrink: 0;
  display: flex;
  align-items: center;
}
.blog-nav-logo img {
  height: 56px;          /* = SPA h-14 */
  width: auto;
  transition: transform .2s;
}
.blog-nav-logo img:hover { transform: scale(1.05); }

.blog-nav-links {
  display: flex;
  align-items: center;
  gap: 2.5rem;           /* = SPA space-x-10 */
}
.blog-nav-links a {
  color: var(--gray-700);
  font-size: 1rem;
  font-weight: 600;
  transition: color .2s;
  white-space: nowrap;
}
.blog-nav-links a:hover { color: var(--primary); }
.blog-nav-links .nav-cta {
  background: var(--primary);
  color: var(--white) !important;
  padding: .55rem 1.25rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: .95rem;
  box-shadow: var(--shadow-btn);
  transition: background .2s, box-shadow .2s, transform .15s;
}
.blog-nav-links .nav-cta:hover {
  background: var(--primary-hover);
  box-shadow: var(--shadow-glow);
  transform: scale(1.02);
}

/* Hamburger (für weiße Nav: dunkle Balken) */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: .25rem;
  margin-left: auto;
}
.nav-hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--gray-700);
  border-radius: 2px;
  transition: transform .25s, opacity .2s;
}
.nav-hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* === Container === */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 1.5rem; }
.container-wide { max-width: var(--max-w-wide); margin: 0 auto; padding: 0 1.5rem; }

/* === Blog Header (Übersichtsseite) === */
.blog-header {
  background: linear-gradient(135deg, hsl(187, 100%, 32%) 0%, hsl(187, 80%, 45%) 100%);
  padding: 4rem 1.5rem;
  text-align: center;
  color: var(--white);
}
.blog-header h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  margin-bottom: .75rem;
}
.blog-header h1 span { color: rgba(255,255,255,.85); font-style: italic; }
.blog-header p {
  color: rgba(255,255,255,.88);
  font-size: 1rem;
  max-width: 540px;
  margin: 0 auto;
}

/* === Category Filter === */
.category-filter {
  display: flex;
  gap: .5rem;
  flex-wrap: wrap;
  padding: 1.5rem 0;
  justify-content: center;
}
.filter-btn {
  background: none;
  border: 1.5px solid var(--gray-200);
  color: var(--gray-700);
  padding: .35rem .9rem;
  border-radius: 20px;
  font-family: var(--font);
  font-size: .85rem;
  cursor: pointer;
  transition: all .2s;
}
.filter-btn:hover, .filter-btn.active {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-bg);
}

/* === Post Grid === */
.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 2rem;
  padding: 2rem 0 4rem;
}

/* === Post Card === */
.post-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: transform .2s, box-shadow .2s;
  display: flex;
  flex-direction: column;
}
.post-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}
.post-card-image {
  height: 200px;
  overflow: hidden;
  background: var(--gray-100);
}
.post-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .3s;
}
.post-card:hover .post-card-image img { transform: scale(1.04); }
.post-card-body { padding: 1.25rem 1.5rem 1.5rem; flex: 1; display: flex; flex-direction: column; }
.post-category {
  display: inline-block;
  background: var(--primary-bg);
  color: var(--primary);
  font-size: .75rem;
  font-weight: 600;
  padding: .2rem .65rem;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: .04em;
  margin-bottom: .75rem;
}
.post-card-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--gray-900);
  line-height: 1.4;
  margin-bottom: .6rem;
}
.post-card-desc {
  font-size: .9rem;
  color: var(--gray-500);
  line-height: 1.6;
  flex: 1;
  margin-bottom: 1rem;
}
.post-card-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: .8rem;
  color: var(--gray-400);
  padding-top: .75rem;
  border-top: 1px solid var(--gray-100);
}
.post-card-link {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  color: var(--primary);
  font-weight: 600;
  font-size: .875rem;
  margin-top: .75rem;
  transition: color .2s;
}
.post-card-link::after { content: '→'; transition: transform .2s; }
.post-card:hover .post-card-link::after { transform: translateX(3px); }

/* === Loading / Error States === */
.loading-state, .error-state {
  text-align: center;
  padding: 4rem 1.5rem;
  color: var(--gray-500);
}

/* === Single Post: Hero === */
.post-hero {
  background: var(--foreground);
  padding: 3rem 1.5rem 2rem;
  color: var(--white);
}
.post-back {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  color: rgba(255,255,255,.6);
  font-size: .85rem;
  margin-bottom: 1.5rem;
  transition: color .2s;
}
.post-back:hover { color: var(--white); }
.post-back::before { content: '←'; }
.post-hero-category {
  display: inline-block;
  background: hsl(187, 100%, 32%, .18);
  color: hsl(187, 80%, 72%);
  font-size: .8rem;
  font-weight: 600;
  padding: .25rem .75rem;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: .05em;
  margin-bottom: 1rem;
}
.post-hero h1 {
  font-size: clamp(1.6rem, 4vw, 2.25rem);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 1rem;
  max-width: 720px;
}
.post-hero-meta {
  display: flex;
  gap: 1.25rem;
  color: rgba(255,255,255,.55);
  font-size: .875rem;
  align-items: center;
  flex-wrap: wrap;
}
.post-hero-image {
  width: 100%;
  max-width: var(--max-w);
  margin: 2rem auto 0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}
.post-hero-image img { width: 100%; height: auto; max-height: 420px; object-fit: cover; }

/* === Post Content === */
.post-body { padding: 3rem 0 1rem; }
.post-body h2 {
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--gray-900);
  margin: 2.25rem 0 1rem;
  padding-top: .5rem;
}
.post-body h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--gray-900);
  margin: 1.75rem 0 .75rem;
}
.post-body p { margin-bottom: 1.25rem; color: var(--gray-700); font-size: .975rem; }
.post-body ul, .post-body ol {
  margin: .75rem 0 1.25rem 1.5rem;
  color: var(--gray-700);
  font-size: .975rem;
}
.post-body li { margin-bottom: .5rem; }
.post-body strong { color: var(--gray-900); font-weight: 600; }
.post-body a { color: var(--primary); border-bottom: 1px solid var(--primary-bg); }
.post-body a:hover { border-bottom-color: var(--primary); }

.post-body .highlight-box {
  background: var(--primary-bg);
  border-left: 4px solid var(--primary);
  padding: 1rem 1.25rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 1.5rem 0;
  font-size: .95rem;
  color: var(--gray-700);
}

.post-body .comparison-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: .9rem;
}
.post-body .comparison-table th {
  background: var(--foreground);
  color: var(--white);
  padding: .75rem 1rem;
  text-align: left;
  font-weight: 600;
}
.post-body .comparison-table td {
  padding: .65rem 1rem;
  border-bottom: 1px solid var(--gray-200);
  color: var(--gray-700);
}
.post-body .comparison-table tr:nth-child(even) td { background: var(--gray-50); }

/* === CTA Box === */
.cta-box {
  background: linear-gradient(135deg, var(--foreground) 0%, hsl(220, 20%, 22%) 100%);
  border-radius: var(--radius);
  padding: 2.5rem 2rem;
  text-align: center;
  margin: 3rem 0 2rem;
  color: var(--white);
}
.cta-box h3 { font-size: 1.25rem; margin-bottom: .75rem; }
.cta-box p { color: rgba(255,255,255,.7); margin-bottom: 1.5rem; font-size: .95rem; }
.btn-primary {
  display: inline-block;
  background: var(--primary);
  color: var(--white);
  padding: .8rem 2rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: .95rem;
  box-shadow: var(--shadow-btn);
  transition: background .2s, box-shadow .2s, transform .15s;
}
.btn-primary:hover {
  background: var(--primary-hover);
  color: var(--white);
  box-shadow: var(--shadow-glow);
  transform: scale(1.02);
}

/* === Post Footer (vor Site-Footer) === */
.post-footer {
  border-top: 1px solid var(--gray-200);
  padding: 1.5rem 0 4rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: .875rem;
  color: var(--gray-500);
}
.post-footer a { color: var(--primary); }

/* === Site Footer (identisch zur SPA: bg-foreground) === */
.blog-site-footer {
  background: var(--foreground);
  color: var(--gray-300);
  padding: 3rem 1.5rem 2rem;
  font-size: .875rem;
}
.footer-grid {
  max-width: var(--max-w-wide);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid rgba(255,255,255,.1);
  margin-bottom: 1.5rem;
}
.footer-brand img {
  height: 48px;            /* = SPA h-12 */
  width: auto;
  margin-bottom: 1rem;
  transition: transform .2s;
}
.footer-brand img:hover { transform: scale(1.05); }
.footer-brand p {
  color: var(--gray-300);
  font-size: .875rem;
  line-height: 1.65;
  max-width: 280px;
}
.footer-col h4 {
  color: var(--white);
  font-size: 1rem;         /* = SPA text-lg */
  font-weight: 600;
  margin-bottom: 1rem;
}
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: .6rem; }
.footer-col ul a {
  color: var(--gray-300);
  font-size: .875rem;
  transition: color .18s;
}
.footer-col ul a:hover { color: var(--white); }
.footer-bottom {
  max-width: var(--max-w-wide);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: .75rem;
  font-size: .8rem;
  color: hsl(220, 10%, 60%);  /* = SPA text-gray-400 */
}
.footer-bottom a { color: hsl(220, 10%, 60%); transition: color .18s; }
.footer-bottom a:hover { color: var(--white); }
.footer-legal { display: flex; gap: 1.25rem; }

/* === Responsive === */
@media (max-width: 900px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 768px) {
  .nav-hamburger { display: flex; }
  .blog-nav-inner { padding: 0 1.25rem; }
  .blog-nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    align-items: flex-start;
    padding: 1rem 1.5rem 1.5rem;
    gap: 1rem;
    box-shadow: 0 8px 24px rgba(0,0,0,.12);
    border-top: 1px solid var(--gray-200);
  }
  .blog-nav-links.open { display: flex; }
  .blog-nav-links a { color: var(--gray-700); font-size: 1rem; }
  .blog-nav-links .nav-cta { align-self: flex-start; margin-top: .25rem; }
  .post-grid { grid-template-columns: 1fr; gap: 1.25rem; }
  .post-hero { padding: 2rem 1.25rem 1.5rem; }
  .cta-box { padding: 1.75rem 1.25rem; }
  .footer-grid { grid-template-columns: 1fr; gap: 1.75rem; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}