/* =====================================================
   BLOG — Global
===================================================== */

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

body {
  font-family: 'Inter', sans-serif;
  background: #f7f9fc;
  color: #3a4553;
  line-height: 1.75;
}

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

a {
  color: #2196f3;
  text-decoration: none;
}

a:hover {
  color: #0d72c1;
}

code {
  font-family: 'Fira Code', monospace;
  font-size: 0.88em;
  background: #eef2f7;
  color: #c0392b;
  padding: 2px 6px;
  border-radius: 4px;
}

/* =====================================================
   NAV
===================================================== */

.blog-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #1565c0;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.blog-nav-inner {
  max-width: 860px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.back-link {
  color: rgba(255,255,255,0.85);
  font-size: 0.88rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: color 0.2s;
}

.back-link:hover {
  color: #fff;
}

.blog-nav-title {
  color: rgba(255,255,255,0.55);
  font-size: 0.82rem;
  letter-spacing: 0.05em;
}

/* =====================================================
   MAIN LAYOUT
===================================================== */

.blog-main {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 24px 60px;
}

/* =====================================================
   HERO
===================================================== */

.blog-hero {
  padding: 56px 0 32px;
}

.blog-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.blog-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #e3f2fd;
  color: #1565c0;
  border: 1px solid #90caf9;
  border-radius: 20px;
  padding: 4px 12px;
  font-size: 0.78rem;
  font-weight: 600;
}

.blog-hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  color: #1a202c;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.blog-hero h1 span {
  color: #2196f3;
}

.blog-byline {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid #e2e8f0;
}

.blog-byline div {
  display: flex;
  flex-direction: column;
  line-height: 1.4;
}

.blog-byline strong {
  font-size: 0.9rem;
  color: #1a202c;
}

.blog-byline span {
  font-size: 0.8rem;
  color: #718096;
}

.blog-date {
  margin-left: auto;
  font-size: 0.82rem;
  color: #718096;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* =====================================================
   BANNER IMAGE
===================================================== */

.blog-banner {
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 48px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.blog-banner img {
  width: 100%;
  max-height: 380px;
  object-fit: cover;
}

/* =====================================================
   ARTICLE CONTENT
===================================================== */

.blog-content {
  background: #fff;
  border-radius: 12px;
  padding: 48px 52px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.05);
}

.blog-intro {
  font-size: 1.05rem;
  color: #4a5568;
  line-height: 1.85;
  border-left: 4px solid #2196f3;
  padding-left: 20px;
  margin-bottom: 40px;
}

/* Prerequisites */
.prereq-box {
  background: #f0f7ff;
  border: 1px solid #bee3f8;
  border-radius: 10px;
  padding: 24px 28px;
  margin-bottom: 48px;
}

.prereq-box h3 {
  font-size: 1rem;
  font-weight: 700;
  color: #1565c0;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.prereq-box ul {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 8px;
}

.prereq-box ul li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: #2d3748;
}

.prereq-box ul li .fa-check {
  color: #38a169;
  font-size: 0.8rem;
}

/* =====================================================
   PHASE SECTIONS
===================================================== */

.blog-phase {
  margin-bottom: 56px;
  padding-bottom: 48px;
  border-bottom: 1px solid #e8ecf0;
}

.blog-phase:last-of-type {
  border-bottom: none;
}

.phase-header {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  margin-bottom: 32px;
  padding: 24px;
  background: linear-gradient(135deg, #e3f2fd 0%, #f0f7ff 100%);
  border-radius: 12px;
  border-left: 5px solid #2196f3;
}

.phase-number {
  font-family: 'Fira Code', monospace;
  font-size: 2.5rem;
  font-weight: 700;
  color: #2196f3;
  opacity: 0.4;
  line-height: 1;
  flex-shrink: 0;
}

.phase-header h2 {
  font-size: 1.5rem;
  color: #1a202c;
  margin-bottom: 4px;
}

.phase-header p {
  font-size: 0.9rem;
  color: #718096;
  margin: 0;
}

.blog-phase h4 {
  font-size: 1rem;
  font-weight: 600;
  color: #2d3748;
  margin: 28px 0 12px;
}

.blog-phase p {
  font-size: 0.93rem;
  color: #4a5568;
  margin-bottom: 16px;
}

/* Code blocks */
.code-block {
  background: #1a1a2e;
  border-radius: 8px;
  overflow: hidden;
  margin: 16px 0 24px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.15);
}

.code-block-header {
  background: rgba(255,255,255,0.05);
  padding: 8px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.code-block-header span {
  font-size: 0.75rem;
  font-weight: 600;
  color: rgba(255,255,255,0.4);
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

.code-block-header i {
  color: rgba(255,255,255,0.25);
  font-size: 0.85rem;
}

.code-block pre {
  margin: 0;
  padding: 20px 20px;
  overflow-x: auto;
}

.code-block pre code {
  font-family: 'Fira Code', monospace;
  font-size: 0.88rem;
  background: none;
  color: #a8d8a8;
  padding: 0;
  line-height: 1.8;
  white-space: pre;
}

/* Images */
.blog-img-wrap {
  margin: 16px 0 24px;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid #e2e8f0;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.blog-img-wrap img {
  width: 100%;
}

/* Styled list */
.styled-list {
  list-style: none;
  padding: 0;
  margin: 12px 0 20px;
}

.styled-list li {
  padding: 6px 0 6px 20px;
  font-size: 0.9rem;
  color: #4a5568;
  position: relative;
  border-bottom: 1px solid #f0f4f8;
}

.styled-list li:last-child {
  border-bottom: none;
}

.styled-list li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: #2196f3;
  font-weight: 700;
}

.styled-list li a {
  font-weight: 500;
}

/* Tip boxes */
.tip-box {
  border-radius: 10px;
  padding: 20px 24px;
  margin: 20px 0 28px;
}

.tip-box strong {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  margin-bottom: 8px;
}

.tip-box p {
  font-size: 0.88rem;
  margin: 0;
  line-height: 1.65;
}

.tip-recommended {
  background: #f0fdf4;
  border: 1px solid #86efac;
}

.tip-recommended strong {
  color: #15803d;
}

.tip-recommended p {
  color: #166534;
}

.tip-warning {
  background: #fff7ed;
  border: 1px solid #fed7aa;
}

.tip-warning strong {
  color: #c2410c;
}

.tip-warning p {
  color: #9a3412;
}

/* Phase complete badge */
.phase-complete {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: #f0fdf4;
  border: 1px solid #86efac;
  color: #15803d;
  border-radius: 8px;
  padding: 12px 20px;
  font-size: 0.9rem;
  font-weight: 600;
  margin-top: 24px;
}

.success-complete {
  background: #eff6ff;
  border: 1px solid #93c5fd;
  color: #1d4ed8;
  font-size: 1rem;
}

/* =====================================================
   SUMMARY SECTION
===================================================== */

.blog-summary {
  margin-top: 48px;
  padding-top: 40px;
  border-top: 2px solid #e2e8f0;
}

.blog-summary h3 {
  font-size: 1.2rem;
  color: #1a202c;
  margin-bottom: 24px;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}

.summary-card {
  background: #f7f9fc;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  padding: 20px;
}

.summary-card h5 {
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: #2196f3;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.summary-card code {
  display: block;
  font-size: 0.78rem;
  background: none;
  color: #4a5568;
  padding: 2px 0;
}

/* =====================================================
   FOOTER
===================================================== */

.blog-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 48px;
  padding-top: 28px;
  border-top: 1px solid #e2e8f0;
  font-size: 0.88rem;
  color: #718096;
}

.blog-footer .back-link {
  color: #2196f3;
}

/* =====================================================
   RESPONSIVE
===================================================== */

@media (max-width: 640px) {
  .blog-content {
    padding: 28px 20px;
  }

  .blog-hero {
    padding: 36px 0 24px;
  }

  .phase-header {
    flex-direction: column;
    gap: 10px;
  }

  .phase-number {
    font-size: 1.8rem;
  }

  .summary-grid {
    grid-template-columns: 1fr;
  }

  .blog-date {
    margin-left: 0;
  }

  .prereq-box ul {
    grid-template-columns: 1fr;
  }
}