/* ============================================
   LEVELUPFANTASY — Minimalist Light Mode
   Font: Outfit (headings) + Inter (body)
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Outfit:wght@500;700;800&display=swap');

/* --- Tokens --- */
:root {
  --font-heading: 'Outfit', sans-serif;
  --font-body: 'Inter', sans-serif;

  --bg-primary: #FFFFFF;
  --bg-secondary: #F9FAFB;
  --bg-tertiary: #F3F4F6;
  --bg-card: #FFFFFF;

  --accent: #2563EB; /* Royal Blue */
  --accent-dim: rgba(37, 99, 235, 0.08);
  --accent-hover: #1D4ED8;

  --text-primary: #111827; /* Deep Charcoal */
  --text-secondary: #4B5563; /* Slate */
  --text-tertiary: #6B7280;

  --border-color: #E5E7EB;
  --border-dark: #D1D5DB;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

  --transition: 0.2s ease;
  --max-width: 1200px;
  --content-width: 720px;
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-secondary);
  background: var(--bg-primary);
  overflow-x: hidden;
}
img, video, iframe { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-hover); text-decoration: underline; }

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  color: var(--text-primary);
  line-height: 1.15;
  letter-spacing: -0.02em;
}
h1 { font-size: clamp(2.5rem, 6vw, 4rem); font-weight: 800; }
h2 { font-size: clamp(1.8rem, 4vw, 2.5rem); font-weight: 700; }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.5rem); font-weight: 700; }
h4 { font-size: 1.1rem; font-weight: 700; }

/* --- Utility --- */
.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.content-narrow { max-width: var(--content-width); margin: 0 auto; }

.tag {
  display: inline-block;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}
.tag--accent { background: var(--accent-dim); color: var(--accent); border-color: rgba(37,99,235,0.2); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none !important;
}
.btn--primary {
  background: var(--text-primary);
  color: #FFFFFF;
}
.btn--primary:hover {
  background: var(--accent);
  color: #FFFFFF;
  box-shadow: var(--shadow-md);
}
.btn--outline {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--border-dark);
}
.btn--outline:hover {
  border-color: var(--text-primary);
  background: var(--bg-secondary);
}

/* --- Reading Progress Bar --- */
#reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 4px;
  background: var(--accent);
  z-index: 1000;
  transition: width 0.1s linear;
}

/* --- Navigation --- */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 20px 0;
  transition: all var(--transition);
  background: var(--bg-primary);
  border-bottom: 1px solid transparent;
}
.site-nav.scrolled {
  padding: 12px 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.5rem;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  text-decoration: none !important;
}
.nav-logo:hover { color: var(--accent); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}
.nav-links a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none !important;
}
.nav-links a:hover, .nav-links a.active { color: var(--text-primary); }

.nav-socials { display: flex; gap: 16px; align-items: center; }
.nav-socials a { color: var(--text-secondary); }
.nav-socials a:hover { color: var(--text-primary); }

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

.mobile-nav {
  display: none;
  position: fixed;
  inset: 0;
  background: #FFFFFF;
  z-index: 99;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 32px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}
.mobile-nav.active { opacity: 1; pointer-events: all; }
.mobile-nav a {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-primary);
  text-decoration: none !important;
}

/* --- Hero --- */
.hero {
  padding: 160px 0 80px;
  text-align: center;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}
.hero-eyebrow {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 24px;
}
.hero h1 { margin-bottom: 24px; max-width: 900px; margin-inline: auto; }
.hero-desc {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
  max-width: 600px;
  margin-inline: auto;
}
.hero-actions { display: flex; gap: 16px; justify-content: center; }

/* --- Section --- */
.section { padding: 96px 0; }
.section-header { margin-bottom: 48px; text-align: center; }
.section-title { margin-bottom: 16px; }
.section-desc { color: var(--text-secondary); max-width: 600px; margin-inline: auto; font-size: 1.1rem; }

/* --- Article Card --- */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 32px;
}
.article-card {
  display: flex;
  flex-direction: column;
  transition: all var(--transition);
  opacity: 0;
  transform: translateY(20px);
}
.article-card.visible { opacity: 1; transform: translateY(0); }
.article-card:hover .article-card__image { transform: scale(1.02); }
.article-card__image-wrapper {
  width: 100%;
  aspect-ratio: 16/10;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 20px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
}
.article-card__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.article-card__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
  font-size: 0.85rem;
  color: var(--text-tertiary);
}
.article-card__title {
  font-size: 1.4rem;
  margin-bottom: 12px;
  transition: color var(--transition);
}
.article-card a:hover .article-card__title { color: var(--accent); text-decoration: none; }
.article-card__excerpt {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Featured card */
.article-card--featured {
  grid-column: 1 / -1;
  flex-direction: row;
  align-items: center;
  gap: 48px;
  margin-bottom: 32px;
}
.article-card--featured .article-card__image-wrapper {
  flex: 1.5;
  margin-bottom: 0;
  aspect-ratio: 16/9;
}
.article-card--featured .article-card__body { flex: 1; }
.article-card--featured .article-card__title { font-size: 2rem; }

/* --- Media Showcase --- */
.media-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 32px;
}
.media-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.video-container {
  position: relative;
  width: 100%;
  aspect-ratio: 9/16;
  background: var(--bg-tertiary);
}
.video-container iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: none; }
.media-card__caption {
  padding: 16px;
  font-size: 0.9rem;
  color: var(--text-primary);
  font-weight: 500;
  border-top: 1px solid var(--border-color);
}

/* --- Article Page --- */
.article-hero {
  padding: 120px 0 40px;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-secondary);
}
.article-hero .tag { margin-bottom: 24px; }
.article-hero h1 { max-width: 800px; margin-inline: auto; margin-bottom: 24px; font-size: clamp(2rem, 5vw, 3rem); }
.article-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  color: var(--text-tertiary);
  font-size: 0.95rem;
}
.article-featured-img {
  width: 100%;
  max-width: var(--content-width);
  aspect-ratio: 21 / 9;
  object-fit: cover;
  margin: 40px auto 32px;
  display: block;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

/* Article prose */
.prose { max-width: var(--content-width); margin: 0 auto 64px; padding: 0 24px; color: var(--text-primary); font-size: 1.1rem; line-height: 1.7; }
.prose h2 { margin-top: 64px; margin-bottom: 24px; }
.prose h3 { margin-top: 48px; margin-bottom: 16px; }
.prose p { margin-bottom: 24px; }
.prose ul, .prose ol { margin-bottom: 24px; padding-left: 24px; }
.prose li { margin-bottom: 8px; }
.prose blockquote {
  margin: 40px 0;
  padding: 24px 32px;
  border-left: 4px solid var(--text-primary);
  background: var(--bg-secondary);
  font-size: 1.25rem;
  font-family: var(--font-heading);
  font-weight: 500;
  color: var(--text-primary);
}
.prose img { width: 100%; border-radius: var(--radius-sm); margin: 40px 0; border: 1px solid var(--border-color); }
.prose .callout {
  padding: 24px;
  background: var(--bg-secondary);
  border-left: 4px solid var(--accent);
  margin: 40px 0;
  font-size: 1rem;
}

/* Data table */
.data-table-wrap { overflow-x: auto; margin: 40px 0; border: 1px solid var(--border-color); border-radius: var(--radius-sm); }
.data-table { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
.data-table th {
  background: var(--bg-secondary);
  padding: 16px;
  text-align: left;
  font-family: var(--font-heading);
  font-weight: 700;
  border-bottom: 2px solid var(--border-dark);
}
.data-table td { padding: 16px; border-bottom: 1px solid var(--border-color); }
.data-table tr:last-child td { border-bottom: none; }
.data-table .highlight { font-weight: 700; color: var(--text-primary); }

/* Chart container */
.chart-container {
  margin: 48px 0;
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}
.chart-container h4 { margin-bottom: 24px; font-size: 1.25rem; text-align: center; }
.chart-wrap { position: relative; max-height: 400px; }

/* Share bar */
.share-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 64px;
  padding-top: 32px;
  border-top: 1px solid var(--border-color);
}
.share-bar span { font-weight: 600; font-family: var(--font-heading); }
.share-btn {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: all var(--transition);
}
.share-btn:hover { background: var(--text-primary); color: #fff; }

/* --- Footer --- */
.site-footer {
  padding: 64px 0 32px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
}

/* --- Responsive --- */
@media (max-width: 900px) {
  .article-card--featured { flex-direction: column; gap: 24px; }
  .article-card--featured .article-card__image-wrapper { aspect-ratio: 16/10; }
  .hero { padding: 120px 0 64px; }
}

@media (max-width: 768px) {
  .nav-links, .nav-socials { display: none; }
  .hamburger { display: flex; }
  .mobile-nav { display: flex; }
  .hero h1 { font-size: 2.5rem; }
  .footer-inner { flex-direction: column; text-align: center; }
}