/* ============================================================
   Howard Wang — Blog article styles
   Dark, glassy reading experience consistent with the main site
   ============================================================ */

:root {
  --bg-base: #050505;
  --bg-deep: #0f172a;
  --accent: #ffffff;
  --accent-cyan: #cbd5e1;
  --gradient: linear-gradient(135deg, #ffffff 0%, #94a3b8 100%);
  --text-light: #f8fafc;
  --text-muted: #94a3b8;
  --text-faint: #64748b;
  --glass-bg: rgba(15, 23, 42, 0.55);
  --glass-border: rgba(255, 255, 255, 0.08);
  --font-primary: 'Inter', sans-serif;
  --font-display: 'Space Grotesk', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-base);
  color: var(--text-light);
  font-family: var(--font-primary);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Layered background: radial glow + faint engineering grid */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(1200px 600px at 50% -10%, rgba(255, 255, 255, 0.05), transparent 60%),
    radial-gradient(900px 500px at 85% 20%, rgba(255, 255, 255, 0.03), transparent 55%),
    var(--bg-base);
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black, transparent 75%);
}

/* Reading progress bar */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: var(--gradient);
  z-index: 100;
  transition: width 0.1s linear;
}

/* ============================ Navigation ============================ */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  padding: 1rem 0;
  transition: var(--transition);
}

.site-nav.scrolled {
  background: rgba(5, 5, 5, 0.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--glass-border);
  padding: 0.65rem 0;
}

.nav-inner {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.nav-logo {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
  text-decoration: none;
  color: var(--text-light);
}

.logo-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
}

.logo-subtitle {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-light);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border: 1px solid var(--glass-border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.03);
  transition: var(--transition);
}

.back-link i {
  font-size: 0.75rem;
  color: var(--accent-cyan);
  transition: var(--transition);
}

.back-link:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.18);
}

.back-link:hover i {
  transform: translateX(-3px);
}

/* Language toggle */
.lang-toggle {
  display: inline-flex;
  border: 1px solid var(--glass-border);
  border-radius: 999px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.03);
}

.lang-toggle button {
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-family: var(--font-primary);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.45rem 0.8rem;
  cursor: pointer;
  transition: var(--transition);
}

.lang-toggle button.active {
  background: var(--gradient);
  color: #0a0a0a;
}

/* ============================ Article header ============================ */
.article-hero {
  padding: 9rem 1.5rem 3.5rem;
  text-align: center;
}

.article-overline {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  margin-bottom: 1.5rem;
}

.article-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 5.5vw, 3.4rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  max-width: 18ch;
  margin: 0 auto 1.25rem;
  color: var(--text-light);
}

.article-title .grad {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.article-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 52ch;
  margin: 0 auto 2rem;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.9rem;
  flex-wrap: wrap;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.article-meta .dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent-cyan);
}

.article-meta .author {
  color: var(--text-light);
  font-weight: 600;
}

.article-meta .read-time {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-faint);
}

.hero-divider {
  width: 72px;
  height: 3px;
  border-radius: 999px;
  background: var(--gradient);
  margin: 2.5rem auto 0;
}

/* ============================ Article body ============================ */
.article-wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
}

.article-body {
  font-size: 1.08rem;
  line-height: 1.85;
  color: #d7dee8;
}

.article-body p {
  margin-bottom: 1.5rem;
}

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

/* Drop cap for the opening paragraph */
.article-body .lead::first-letter {
  font-family: var(--font-display);
  font-weight: 700;
  float: left;
  font-size: 3.6rem;
  line-height: 0.82;
  margin: 0.18rem 0.55rem 0 0;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.article-body h2 {
  font-family: var(--font-display);
  font-size: 1.55rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-light);
  margin: 3rem 0 1.1rem;
  padding-left: 1rem;
  position: relative;
}

.article-body h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.15em;
  bottom: 0.15em;
  width: 3px;
  border-radius: 999px;
  background: var(--gradient);
}

.article-body h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-light);
  margin: 2.2rem 0 0.8rem;
}

.article-body blockquote {
  margin: 2rem 0;
  padding: 1.25rem 1.5rem;
  border-left: 3px solid var(--accent-cyan);
  background: var(--glass-bg);
  border-radius: 0 14px 14px 0;
  color: var(--text-light);
  font-style: italic;
  font-size: 1.05rem;
}

.article-body blockquote p {
  margin: 0;
}

.article-body ul,
.article-body ol {
  margin: 0 0 1.5rem 1.4rem;
}

.article-body li {
  margin-bottom: 0.7rem;
  padding-left: 0.4rem;
}

.article-body li::marker {
  color: var(--accent-cyan);
}

.article-body a {
  color: var(--accent-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.35);
  transition: var(--transition);
}

.article-body a:hover {
  color: #fff;
  border-bottom-color: #fff;
}

/* Small caps label used in the Pemi itinerary */
.article-body .schedule-list {
  list-style: none;
  margin-left: 0;
}

.article-body .schedule-list li {
  display: flex;
  gap: 0.9rem;
  align-items: baseline;
  padding: 0.75rem 1rem;
  margin-bottom: 0.5rem;
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
}

.article-body .schedule-list li .key {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-cyan);
  min-width: 5.5rem;
}

/* ============================ Footer / actions ============================ */
.article-actions {
  margin-top: 3.5rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--glass-border);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.8rem 1.6rem;
  border-radius: 999px;
  transition: var(--transition);
}

.btn-primary {
  background: var(--gradient);
  color: #0a0a0a;
  box-shadow: 0 8px 24px rgba(255, 255, 255, 0.18);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(255, 255, 255, 0.28);
}

.btn-ghost {
  border: 1px solid var(--glass-border);
  color: var(--text-light);
  background: rgba(255, 255, 255, 0.03);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.18);
}

.site-footer {
  border-top: 1px solid var(--glass-border);
  padding: 2.5rem 1.5rem 3rem;
  text-align: center;
  color: var(--text-faint);
  font-size: 0.85rem;
}

.site-footer .social {
  display: flex;
  justify-content: center;
  gap: 1.1rem;
  margin-bottom: 1.25rem;
}

.site-footer .social a {
  color: var(--text-muted);
  font-size: 1.15rem;
  transition: var(--transition);
}

.site-footer .social a:hover {
  color: var(--accent-cyan);
  transform: translateY(-2px);
}

/* ============================ Responsive ============================ */
@media (max-width: 640px) {
  .article-hero {
    padding-top: 7rem;
  }
  .article-title {
    font-size: 2rem;
  }
  .logo-subtitle {
    display: none;
  }
  .back-link span {
    display: none;
  }
  .back-link {
    padding: 0.5rem 0.75rem;
  }
  .article-body {
    font-size: 1.02rem;
  }
}