/* ========================================
   Royal-AI Blog — Premium Dark Theme v2
   Full colorize + animate pass
   ======================================== */

@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700;1,9..40,400&family=Outfit:wght@400;600;700;800&display=swap');

:root {
  --bg:           #0f0c1d;
  --bg-light:     #1a162e;
  --bg-card:      rgba(255,255,255,0.04);
  --bg-card-h:    rgba(255,255,255,0.07);

  --primary:      #6d28d9;
  --primary-l:    #8b5cf6;
  --primary-pale: rgba(139,92,246,0.12);
  --primary-glow: rgba(139,92,246,0.3);

  --accent:       #fbbf24;
  --accent-dark:  #d97706;
  --accent-pale:  rgba(251,191,36,0.1);

  --cyan:         #22d3ee;
  --cyan-pale:    rgba(34,211,238,0.1);
  --green:        #22c55e;
  --green-pale:   rgba(34,197,94,0.1);
  --rose:         #fb7185;
  --rose-pale:    rgba(251,113,133,0.1);

  --text:         #e8e4f0;
  --text-muted:   #9f95b0;
  --text-faint:   #5a5278;

  --glass:        rgba(255,255,255,0.05);
  --glass-b:      rgba(255,255,255,0.1);
  --glass-ba:     rgba(139,92,246,0.25);

  --grad:         linear-gradient(135deg, #8b5cf6, #fbbf24);
  --grad-cool:    linear-gradient(135deg, #8b5cf6, #22d3ee);
  --grad-warm:    linear-gradient(135deg, #f59e0b, #fb7185);

  --max-width:    780px;
  --r:            16px;
  --r-sm:         10px;

  --ease-out:     cubic-bezier(0.25, 1, 0.5, 1);
  --ease-snappy:  cubic-bezier(0.22, 1, 0.36, 1);
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'DM Sans', system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

/* === HEADER === */
.blog-header {
  position: fixed; top:0; left:0; right:0; z-index:1000;
  background: rgba(15,12,29,0.88);
  backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--glass-b);
  padding: 0 24px; height: 68px;
  display: flex; align-items: center; justify-content: space-between;
}

.blog-logo {
  display: flex; align-items: center; gap: 10px;
  text-decoration: none; transition: opacity 0.2s;
}
.blog-logo:hover { opacity: 0.85; }
.blog-logo-img { height: 36px; width: auto; }
.blog-logo-wordmark {
  font-family: 'Outfit', sans-serif; font-weight: 700;
  font-size: 1.1rem; color: var(--text); letter-spacing: -0.02em;
}
.blog-logo-wordmark span {
  background: var(--grad); -webkit-background-clip: text;
  background-clip: text; -webkit-text-fill-color: transparent;
}

.blog-nav { display: flex; align-items: center; gap: 4px; }
.blog-nav a {
  color: var(--text-muted); text-decoration: none;
  font-size: 0.9rem; font-weight: 500;
  padding: 8px 14px; border-radius: 8px;
  transition: color 0.2s, background 0.2s;
}
.blog-nav a:hover { color: var(--text); background: var(--primary-pale); }
.blog-nav .nav-cta {
  background: var(--grad); color: #fff !important;
  padding: 8px 18px; border-radius: 10px; font-weight: 700;
  margin-left: 6px;
  transition: filter 0.2s, transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 2px 16px var(--primary-glow);
}
.blog-nav .nav-cta:hover {
  filter: brightness(1.1); transform: translateY(-1px);
  background: var(--grad);
  box-shadow: 0 6px 24px var(--primary-glow);
}

/* === READING PROGRESS === */
.reading-progress {
  position: fixed; top: 0; left: 0;
  height: 3px; background: var(--grad);
  z-index: 2000; width: 0%;
  transition: width 0.1s linear;
  pointer-events: none;
  box-shadow: 0 0 8px rgba(139,92,246,0.6);
}

/* === MAIN === */
.blog-main {
  max-width: var(--max-width);
  margin: 100px auto 80px;
  padding: 0 24px;
}

/* === BREADCRUMBS === */
.breadcrumbs {
  font-size: 0.83rem; color: var(--text-faint);
  margin-bottom: 28px;
  display: flex; align-items: center; gap: 6px;
}
.breadcrumbs a { color: var(--text-faint); text-decoration: none; transition: color 0.2s; }
.breadcrumbs a:hover { color: var(--primary-l); }

/* === INDEX PAGE HEADER === */
.blog-index-header { margin-bottom: 52px; }
.blog-index-header h1 {
  font-family: 'Outfit', sans-serif;
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800; letter-spacing: -0.03em; line-height: 1.15;
  color: var(--text); margin-bottom: 14px;
}
.blog-index-header h1 .gradient-word {
  background: var(--grad); -webkit-background-clip: text;
  background-clip: text; -webkit-text-fill-color: transparent;
}
.blog-index-header p {
  font-size: 1.05rem; color: var(--text-muted); max-width: 520px; line-height: 1.65;
}

/* Decorative bar under heading */
.blog-index-header::after {
  content: '';
  display: block;
  width: 60px; height: 3px;
  background: var(--grad);
  border-radius: 2px;
  margin-top: 24px;
}

/* === BLOG CARDS === */
.blog-cards-grid { display: flex; flex-direction: column; gap: 18px; margin-bottom: 48px; }

.blog-card {
  background: var(--glass);
  border: 1px solid var(--glass-b);
  border-radius: var(--r);
  padding: 28px 32px;
  text-decoration: none; display: block;
  transition: transform 0.3s var(--ease-out),
              border-color 0.3s ease,
              box-shadow 0.3s ease,
              background 0.3s ease;
  position: relative; overflow: hidden;
  cursor: pointer;

  /* Entrance animation */
  opacity: 0; transform: translateY(20px);
}
.blog-card.visible {
  opacity: 1; transform: translateY(0);
  transition: opacity 0.5s var(--ease-out), transform 0.5s var(--ease-out),
              border-color 0.3s, box-shadow 0.3s, background 0.3s;
}

/* Colored top stripe */
.blog-card::after {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: var(--grad);
  opacity: 0; transition: opacity 0.3s;
}
.blog-card:hover::after { opacity: 1; }

/* Glow orb on hover */
.blog-card::before {
  content: '';
  position: absolute; top: -40px; right: -40px;
  width: 140px; height: 140px;
  background: radial-gradient(circle, var(--primary-glow) 0%, transparent 70%);
  opacity: 0; transition: opacity 0.4s;
  pointer-events: none;
}
.blog-card:hover {
  transform: translateY(-5px);
  border-color: var(--glass-ba);
  background: var(--bg-card-h);
  box-shadow: 0 16px 48px rgba(109,40,217,0.2), 0 4px 16px rgba(0,0,0,0.2);
}
.blog-card:hover::before { opacity: 1; }

.blog-card h2 {
  font-family: 'Outfit', sans-serif;
  font-size: 1.2rem; font-weight: 700;
  color: var(--text); margin-bottom: 10px;
  line-height: 1.4; letter-spacing: -0.01em;
  text-decoration: none;
  transition: color 0.2s;
}
.blog-card h2 a { color: inherit; text-decoration: none; }
.blog-card:hover h2 { color: #c4b5fd; }

.blog-card > p {
  color: var(--text-muted); font-size: 0.95rem;
  line-height: 1.65; margin-bottom: 16px;
}

/* Card meta */
.card-meta {
  display: flex; align-items: center; flex-wrap: wrap;
  gap: 6px; font-size: 0.8rem; color: var(--text-faint);
}
.card-tag {
  display: inline-flex; align-items: center;
  font-size: 0.73rem; font-weight: 700;
  padding: 3px 11px; border-radius: 20px;
  letter-spacing: 0.03em; text-transform: uppercase;
  transition: transform 0.2s, box-shadow 0.2s;
}
/* Tag color variants */
.card-tag:nth-child(1) {
  background: var(--primary-pale); color: var(--primary-l);
  border: 1px solid rgba(139,92,246,0.2);
}
.card-tag:nth-child(2) {
  background: var(--accent-pale); color: var(--accent);
  border: 1px solid rgba(251,191,36,0.2);
}
.card-tag:nth-child(3) {
  background: var(--cyan-pale); color: var(--cyan);
  border: 1px solid rgba(34,211,238,0.2);
}
.blog-card:hover .card-tag { transform: translateY(-1px); }

.card-read-more {
  margin-top: 16px; font-size: 0.875rem; font-weight: 600;
  color: var(--primary-l);
  display: flex; align-items: center; gap: 4px;
  transition: gap 0.25s var(--ease-out), color 0.2s;
}
.blog-card:hover .card-read-more { gap: 10px; color: #c4b5fd; }

/* === ARTICLE === */
.blog-article h1 {
  font-family: 'Outfit', sans-serif;
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  font-weight: 800; letter-spacing: -0.03em; line-height: 1.2;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #e8e4f0 30%, #c4b5fd 70%, #a78bfa 100%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}

.blog-meta {
  display: flex; align-items: center; flex-wrap: wrap;
  gap: 10px 18px; margin-bottom: 36px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--glass-b);
  font-size: 0.875rem; color: var(--text-faint);
}
.blog-meta time {
  color: var(--text-muted);
  background: var(--primary-pale);
  border: 1px solid rgba(139,92,246,0.15);
  padding: 3px 12px; border-radius: 20px;
  font-weight: 500;
}
.blog-meta .meta-author {
  color: var(--primary-l); font-weight: 600;
}
.blog-meta .meta-read {
  display: inline-flex; align-items: center; gap: 5px;
  color: var(--text-faint);
}
.blog-meta .meta-read svg { color: var(--accent); }

/* Article h2 — colored left border */
.blog-article h2 {
  font-family: 'Outfit', sans-serif;
  font-size: 1.45rem; font-weight: 700;
  margin: 48px 0 16px; color: var(--text);
  letter-spacing: -0.02em; line-height: 1.3;
  padding-left: 16px;
  border-left: 3px solid var(--primary-l);
  position: relative;

  opacity: 0; transform: translateX(-10px);
  transition: opacity 0.5s var(--ease-out), transform 0.5s var(--ease-out);
}
.blog-article h2.visible { opacity: 1; transform: translateX(0); }

.blog-article h3 {
  font-family: 'Outfit', sans-serif;
  font-size: 1.15rem; font-weight: 600;
  margin: 30px 0 12px;
  background: var(--grad-cool);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.blog-article p {
  margin-bottom: 18px; color: var(--text-muted); line-height: 1.8;
}
.blog-article p:last-child { margin-bottom: 0; }

.blog-article ul, .blog-article ol {
  margin: 18px 0 18px 8px; padding-left: 20px; color: var(--text-muted);
}
.blog-article li { margin-bottom: 10px; line-height: 1.7; }
.blog-article li::marker { color: var(--primary-l); }

.blog-article strong { color: var(--text); font-weight: 600; }

.blog-article a {
  color: var(--primary-l); text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(139,92,246,0.35);
  transition: color 0.2s, text-decoration-color 0.2s;
}
.blog-article a:hover { color: #c4b5fd; text-decoration-color: #c4b5fd; }

/* Highlight box */
.blog-article .highlight-box {
  background: var(--primary-pale);
  border-left: 3px solid var(--primary-l);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  padding: 16px 20px; margin: 24px 0; color: var(--text);
}

/* Stats / number callouts */
.blog-article .stat-callout {
  background: linear-gradient(135deg, rgba(139,92,246,0.1), rgba(251,191,36,0.06));
  border: 1px solid rgba(139,92,246,0.2);
  border-radius: var(--r); padding: 24px 28px;
  margin: 32px 0; text-align: center;
}
.blog-article .stat-callout strong {
  display: block; font-family: 'Outfit', sans-serif;
  font-size: 2.2rem; font-weight: 800;
  background: var(--grad); -webkit-background-clip: text;
  background-clip: text; -webkit-text-fill-color: transparent;
}

/* === CTA BOX === */
.blog-cta {
  background: linear-gradient(135deg, rgba(109,40,217,0.15) 0%, rgba(251,191,36,0.08) 100%);
  border: 1px solid rgba(139,92,246,0.25);
  border-radius: var(--r); padding: 40px;
  margin: 52px 0; text-align: center;
  position: relative; overflow: hidden;

  opacity: 0; transform: translateY(24px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}
.blog-cta.visible { opacity: 1; transform: translateY(0); }

/* Decorative orbs */
.blog-cta::before {
  content: '';
  position: absolute; top: -60px; right: -60px;
  width: 200px; height: 200px;
  background: radial-gradient(circle, rgba(251,191,36,0.15) 0%, transparent 70%);
  pointer-events: none;
}
.blog-cta::after {
  content: '';
  position: absolute; bottom: -40px; left: -40px;
  width: 160px; height: 160px;
  background: radial-gradient(circle, rgba(139,92,246,0.12) 0%, transparent 70%);
  pointer-events: none;
}

.blog-cta h3 {
  font-family: 'Outfit', sans-serif;
  font-size: 1.35rem; font-weight: 800;
  margin-bottom: 10px; letter-spacing: -0.02em;
  position: relative; z-index: 1;
  text-align: center;
  background: var(--grad); -webkit-background-clip: text;
  background-clip: text; -webkit-text-fill-color: transparent;
}
.blog-cta p {
  color: var(--text-muted); margin-bottom: 26px;
  font-size: 1rem; line-height: 1.65;
  position: relative; z-index: 1;
  text-align: center;
  max-width: 480px; margin-left: auto; margin-right: auto;
}
.blog-cta .btn {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 14px 30px;
  background: var(--grad);
  color: #fff; border-radius: 12px; text-decoration: none;
  font-weight: 700; font-size: 1rem;
  transition: filter 0.2s, transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 24px rgba(109,40,217,0.4);
  position: relative; z-index: 1;
}
.blog-cta .btn:hover {
  filter: brightness(1.1); transform: translateY(-3px);
  box-shadow: 0 10px 36px rgba(109,40,217,0.55);
  text-decoration: none; color: #fff;
}
.blog-cta .btn:active { transform: translateY(-1px); }

/* === FAQ === */
.faq-section { margin: 48px 0; }

.faq-item { margin-bottom: 10px; }
.faq-item details {
  background: var(--glass);
  border: 1px solid var(--glass-b);
  border-radius: var(--r-sm); overflow: hidden;
  transition: border-color 0.25s;
}
.faq-item details[open] { border-color: var(--glass-ba); }

.faq-item summary {
  padding: 16px 20px; cursor: pointer;
  font-weight: 600; font-family: 'DM Sans', sans-serif;
  color: var(--text); list-style: none;
  display: flex; align-items: center; gap: 12px;
  transition: background 0.2s, color 0.2s;
  user-select: none;
}
.faq-item summary::-webkit-details-marker { display: none; }

/* Animated toggle icon */
.faq-item summary::before {
  content: '';
  width: 20px; height: 20px; flex-shrink: 0;
  border: 1.5px solid var(--glass-ba);
  border-radius: 50%;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%238b5cf6' stroke-width='2.5'%3E%3Cpath d='M9 18l6-6-6-6'/%3E%3C/svg%3E");
  background-size: 13px; background-position: center; background-repeat: no-repeat;
  transition: transform 0.3s var(--ease-snappy), border-color 0.25s, background-color 0.25s;
}
.faq-item details[open] summary::before {
  transform: rotate(90deg);
  border-color: var(--primary-l);
  background-color: var(--primary-pale);
}
.faq-item summary:hover {
  background: var(--primary-pale); color: var(--text);
}
.faq-item details[open] summary { color: #c4b5fd; }

.faq-answer {
  padding: 4px 20px 20px 52px;
  color: var(--text-muted); line-height: 1.75; font-size: 0.95rem;
  animation: faq-open 0.3s var(--ease-snappy);
}

@keyframes faq-open {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* === RELATED POSTS === */
.related-posts { margin: 52px 0 0; }
.related-posts h3 {
  font-family: 'Outfit', sans-serif;
  font-size: 0.8rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.1em;
  color: var(--text-faint); margin-bottom: 14px;
}

.related-link {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 18px; margin-bottom: 8px;
  background: var(--glass); border: 1px solid var(--glass-b);
  border-radius: var(--r-sm); color: var(--text);
  text-decoration: none; font-size: 0.9rem;
  transition: border-color 0.25s, background 0.25s, transform 0.25s var(--ease-out), color 0.25s;
}
.related-link::before {
  content: '→';
  color: var(--primary-l); font-size: 0.85rem; flex-shrink: 0;
  transition: transform 0.25s var(--ease-out), color 0.25s;
}
.related-link:hover {
  border-color: var(--glass-ba);
  background: var(--primary-pale);
  transform: translateX(5px); color: var(--text);
}
.related-link:hover::before { transform: translateX(4px); color: #c4b5fd; }

/* === FOOTER === */
.blog-footer {
  max-width: var(--max-width); margin: 0 auto; padding: 36px 24px 56px;
  border-top: 1px solid var(--glass-b);
  text-align: center; color: var(--text-faint); font-size: 0.85rem; line-height: 1.7;
}
.blog-footer a { color: var(--primary-l); text-decoration: none; transition: color 0.2s; }
.blog-footer a:hover { color: var(--text); }

/* === SCROLL REVEAL BASE === */
.reveal {
  opacity: 0; transform: translateY(20px);
  transition: opacity 0.55s var(--ease-out), transform 0.55s var(--ease-out);
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* === REDUCED MOTION === */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .blog-card, .blog-cta, .blog-article h2, .reveal {
    opacity: 1 !important; transform: none !important;
  }
}

/* === RESPONSIVE === */
@media (max-width: 640px) {
  .blog-main { margin-top: 88px; padding: 0 18px; }
  .blog-header { padding: 0 18px; height: 60px; }
  .blog-nav a { padding: 6px 10px; font-size: 0.82rem; }
  .blog-nav .nav-cta { padding: 7px 14px; margin-left: 4px; }
  .blog-article h1 { font-size: 1.6rem; }
  .blog-index-header h1 { font-size: 1.8rem; }
  .blog-cta { padding: 28px 22px; }
  .blog-card { padding: 22px 24px; }
  .faq-answer { padding-left: 20px; }
}

@media (max-width: 420px) {
  .blog-nav a:not(.nav-cta) { display: none; }
}