/* ============================================
   MemoRealm Blog — Styles
   Extends base site design system
   ============================================ */

/* --- Import base variables from parent --- */
:root {
  --navy:       #0A1628;
  --navy-light: #0F2038;
  --navy-mid:   #162A48;
  --navy-dark:  #060E1A;
  --amber:      #F5A623;
  --amber-glow: #F5A62340;
  --amber-soft: #F5A62318;
  --white:      #F8F9FB;
  --gray-100:   #E8EBF0;
  --gray-200:   #C8CDD6;
  --gray-300:   #8892A4;
  --gray-400:   #5A6478;
  --green:      #4ADE80;
  --red:        #EF4444;
  --yellow:     #FACC15;
  --font-mono:  'JetBrains Mono', monospace;
  --font-body:  'Inter', -apple-system, sans-serif;
  --font-head:  'Playfair Display', Georgia, serif;
  --max-width:  1200px;
  --radius:     12px;
  --radius-sm:  8px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- Reset & Base --- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-body);
  background: var(--navy);
  color: var(--white);
  line-height: 1.7;
  overflow-x: hidden;
}

a { color: var(--amber); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--white); }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================
   READING PROGRESS BAR
   ============================================ */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: var(--amber);
  z-index: 200;
  transition: width 0.1s linear;
  box-shadow: 0 0 8px var(--amber-glow);
}

/* ============================================
   NAV (shared with main site)
   ============================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 0;
  transition: all var(--transition);
  backdrop-filter: blur(0px);
}

.nav--scrolled {
  background: rgba(10, 22, 40, 0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(245, 166, 35, 0.1);
  padding: 10px 0;
}

.nav__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--white);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.1rem;
}

.nav__logo-icon {
  color: var(--amber);
  font-size: 1.4rem;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav__links a {
  color: var(--gray-200);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition);
}
.nav__links a:hover { color: var(--white); }
.nav__links a.active { color: var(--amber); }

.nav__github {
  display: flex;
  opacity: 0.7;
  transition: opacity var(--transition);
}
.nav__github:hover { opacity: 1; }

.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav__hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ============================================
   BLOG HERO / PAGE HEADER
   ============================================ */
.blog-hero {
  padding: 140px 0 64px;
  background: linear-gradient(180deg, var(--navy) 0%, var(--navy-light) 100%);
}

.blog-hero__title {
  font-family: var(--font-head);
  font-size: clamp(2.4rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 16px;
}

.blog-hero__subtitle {
  color: var(--gray-200);
  font-size: 1.15rem;
  max-width: 560px;
  line-height: 1.7;
}

/* ============================================
   BLOG CARD GRID
   ============================================ */
.blog-grid {
  padding: 64px 0 120px;
}

.blog-grid__cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.blog-card {
  background: var(--navy-light);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  padding: 36px;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}

.blog-card:hover {
  border-color: var(--amber-glow);
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0,0,0,0.2);
}

.blog-card__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--amber);
  background: var(--amber-soft);
  border: 1px solid rgba(245, 166, 35, 0.15);
  padding: 4px 12px;
  border-radius: 100px;
  margin-bottom: 16px;
  width: fit-content;
}

.blog-card__title {
  font-family: var(--font-head);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 12px;
  color: var(--white);
}

.blog-card__title a {
  color: var(--white);
  transition: color var(--transition);
}
.blog-card__title a:hover {
  color: var(--amber);
}

.blog-card__meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--gray-400);
  margin-bottom: 16px;
}

.blog-card__meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

.blog-card__excerpt {
  color: var(--gray-300);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 24px;
  flex: 1;
}

.blog-card__link {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--amber);
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.blog-card__link:hover {
  color: var(--white);
  gap: 10px;
}

/* ============================================
   ARTICLE LAYOUT
   ============================================ */
.article-header {
  padding: 140px 0 48px;
  background: linear-gradient(180deg, var(--navy) 0%, var(--navy-light) 100%);
}

.article-header__inner {
  max-width: 720px;
  margin: 0 auto;
}

.article-header__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--amber);
  background: var(--amber-soft);
  border: 1px solid rgba(245, 166, 35, 0.15);
  padding: 4px 12px;
  border-radius: 100px;
  margin-bottom: 20px;
}

.article-header__title {
  font-family: var(--font-head);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 24px;
}

.article-header__meta {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  font-size: 0.9rem;
  color: var(--gray-300);
}

.article-header__author {
  font-weight: 600;
  color: var(--white);
}

.article-header__sep {
  color: var(--gray-400);
}

.article-header__date,
.article-header__reading-time {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--gray-400);
}

/* ============================================
   ARTICLE PROSE
   ============================================ */
.article {
  padding: 48px 0 80px;
}

.article__body {
  max-width: 720px;
  margin: 0 auto;
}

/* Paragraphs */
.article__body p {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--gray-100);
  margin-bottom: 24px;
}

/* Headings */
.article__body h2 {
  font-family: var(--font-head);
  font-size: 1.85rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--white);
  margin-top: 56px;
  margin-bottom: 20px;
}

.article__body h3 {
  font-family: var(--font-body);
  font-size: 1.3rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--white);
  margin-top: 40px;
  margin-bottom: 16px;
}

/* Links in article */
.article__body a {
  color: var(--amber);
  text-decoration: underline;
  text-decoration-color: rgba(245, 166, 35, 0.3);
  text-underline-offset: 3px;
  transition: text-decoration-color var(--transition);
}
.article__body a:hover {
  text-decoration-color: var(--amber);
  color: var(--amber);
}

/* Emphasis */
.article__body em {
  font-style: italic;
  color: var(--amber);
}

.article__body strong {
  font-weight: 700;
  color: var(--white);
}

/* Blockquotes */
.article__body blockquote {
  border-left: 3px solid var(--amber);
  padding: 16px 24px;
  margin: 32px 0;
  background: var(--amber-soft);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.article__body blockquote p {
  color: var(--gray-200);
  font-size: 1.05rem;
  font-style: italic;
  margin-bottom: 0;
}

.article__body blockquote p + p {
  margin-top: 12px;
}

/* Code — inline */
.article__body code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--navy-mid);
  color: var(--amber);
  padding: 2px 8px;
  border-radius: 4px;
  border: 1px solid rgba(255,255,255,0.06);
}

/* Code — blocks */
.article__body pre {
  background: var(--navy-dark);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  padding: 24px;
  margin: 32px 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.article__body pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--gray-200);
}

/* Lists */
.article__body ul,
.article__body ol {
  margin: 24px 0;
  padding-left: 24px;
}

.article__body li {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--gray-100);
  margin-bottom: 8px;
}

.article__body ul li {
  list-style: none;
  position: relative;
  padding-left: 20px;
}

.article__body ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--amber);
}

.article__body ol li {
  padding-left: 8px;
}

.article__body ol li::marker {
  color: var(--amber);
  font-family: var(--font-mono);
  font-weight: 600;
}

/* Figures */
.article__body figure {
  margin: 40px 0;
}

.article__body figure img {
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid rgba(255,255,255,0.08);
}

.article__body figcaption {
  font-size: 0.85rem;
  color: var(--gray-400);
  text-align: center;
  margin-top: 12px;
  font-style: italic;
}

/* Horizontal rule */
.article__body hr {
  border: none;
  height: 1px;
  background: rgba(255,255,255,0.08);
  margin: 48px 0;
}

/* ============================================
   AUTHOR BIO
   ============================================ */
.author-bio {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 0;
  border-top: 1px solid rgba(255,255,255,0.08);
}

.author-bio__card {
  display: flex;
  align-items: center;
  gap: 24px;
  background: var(--navy-light);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  padding: 32px;
}

.author-bio__avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--amber);
  color: var(--navy);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-head);
  font-size: 1.8rem;
  font-weight: 700;
  flex-shrink: 0;
}

.author-bio__info h4 {
  font-family: var(--font-body);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 4px;
}

.author-bio__info p {
  color: var(--gray-300);
  font-size: 0.9rem;
  margin-bottom: 10px;
}

.author-bio__links {
  display: flex;
  gap: 16px;
}

.author-bio__links a {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--gray-300);
  transition: color var(--transition);
}
.author-bio__links a:hover {
  color: var(--amber);
}

/* ============================================
   POST NAV (Back / Next)
   ============================================ */
.post-nav {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 0 80px;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
}

.post-nav__back {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--gray-300);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color var(--transition);
}
.post-nav__back:hover {
  color: var(--amber);
}

.post-nav__next {
  background: var(--navy-light);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  max-width: 340px;
  transition: all var(--transition);
}
.post-nav__next:hover {
  border-color: var(--amber-glow);
  transform: translateY(-2px);
}

.post-nav__next-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--gray-400);
  margin-bottom: 6px;
  display: block;
}

.post-nav__next-title {
  font-family: var(--font-head);
  font-size: 1.1rem;
  color: var(--white);
  line-height: 1.3;
}

/* ============================================
   FOOTER (shared with main site)
   ============================================ */
.footer {
  padding: 64px 0 32px;
  background: var(--navy-light);
  border-top: 1px solid rgba(255,255,255,0.06);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer__brand .nav__logo-icon,
.footer__brand .nav__logo-text {
  font-size: 1.1rem;
}

.footer__tagline {
  color: var(--gray-400);
  font-size: 0.9rem;
  margin-top: 8px;
}

.footer__links h5 {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--gray-400);
  margin-bottom: 16px;
}

.footer__links a {
  display: block;
  color: var(--gray-200);
  font-size: 0.9rem;
  padding: 4px 0;
}
.footer__links a:hover { color: var(--amber); }

.footer__bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: 24px;
}

.footer__bottom p {
  color: var(--gray-400);
  font-size: 0.8rem;
  text-align: center;
}

/* ============================================
   ANIMATIONS
   ============================================ */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-in--visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-delay-1 { transition-delay: 0.1s; }
.fade-in-delay-2 { transition-delay: 0.2s; }
.fade-in-delay-3 { transition-delay: 0.3s; }

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
  .nav__links { display: none; }
  .nav__hamburger { display: flex; }

  .nav__links--open {
    display: flex;
    flex-direction: column;
    position: fixed;
    inset: 0;
    background: var(--navy);
    padding: 100px 32px 32px;
    z-index: 99;
    gap: 24px;
  }

  .nav__links--open a {
    font-size: 1.2rem;
  }

  .blog-hero { padding: 120px 0 48px; }
  .blog-hero__title { font-size: 2.2rem; }

  .blog-grid__cards {
    grid-template-columns: 1fr;
  }

  .blog-card__title { font-size: 1.3rem; }

  .article-header { padding: 120px 0 40px; }
  .article-header__title { font-size: 1.8rem; }

  .article-header__meta {
    flex-direction: column;
    gap: 6px;
    align-items: flex-start;
  }

  .article-header__sep { display: none; }

  .article__body h2 { font-size: 1.5rem; margin-top: 40px; }
  .article__body h3 { font-size: 1.15rem; margin-top: 32px; }

  .article__body pre {
    margin-left: -24px;
    margin-right: -24px;
    border-radius: 0;
    padding: 20px 24px;
  }

  .author-bio__card {
    flex-direction: column;
    text-align: center;
  }

  .author-bio__links {
    justify-content: center;
  }

  .post-nav {
    flex-direction: column;
  }

  .post-nav__next {
    max-width: 100%;
    width: 100%;
  }

  .footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 480px) {
  .blog-hero__title { font-size: 1.8rem; }
  .article-header__title { font-size: 1.5rem; }
}