/* ==========================================================================
   BITCOIN JOURNAL - PREMIUM DESIGN SYSTEM & UTILITY STYLES
   ========================================================================== */

:root {
  --bg-dark: #121414;
  --bg-surface: #121414;
  --bg-surface-container: #1e2020;
  --bg-surface-low: #1a1c1c;
  --bg-surface-high: #282a2b;
  --accent-gold: #f7931a;
  --accent-gold-bright: #ffb874;
  --text-on-surface: #e2e2e2;
  --text-on-variant: #dbc2ae;
  --font-display: 'Playfair Display', serif;
  --font-mono: 'Space Grotesk', monospace;
  --font-body: 'Geist', 'Inter', sans-serif;
}

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

html {
  background-color: var(--bg-dark);
  color: var(--text-on-surface);
  font-family: var(--font-body);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  position: relative;
  background-color: var(--bg-dark);
}

/* Custom Minimal Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: #0c0f0f;
}
::-webkit-scrollbar-thumb {
  background: rgba(247, 147, 26, 0.4);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent-gold);
}

/* Accessibility Focus Indicators */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid var(--accent-gold-bright) !important;
  outline-offset: 2px !important;
}

/* Film Grain Overlay */
.grain-overlay, .grain {
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  background-image: url("https://www.transparenttextures.com/patterns/carbon-fibre.png");
  opacity: 0.03;
  pointer-events: none;
  z-index: 9999;
}

/* Gold Gradient Text */
.text-gradient-gold {
  background: linear-gradient(135deg, #ffb874 0%, #f7931a 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Material Symbols Icon Tweaks */
.material-symbols-outlined {
  font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
  vertical-align: middle;
}

/* HERO CANVAS WRAPPER & PINNED HERO SECTION */
#scroll-animation-section {
  position: relative;
  width: 100%;
  height: 300vh;
}

.sticky-canvas-container {
  position: sticky;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  z-index: 1;
}

#hero-canvas {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

.canvas-overlay-vignette {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, transparent 35%, rgba(18, 20, 20, 0.85) 90%),
              linear-gradient(to bottom, rgba(18, 20, 20, 0.4) 0%, transparent 20%, transparent 70%, rgba(18, 20, 20, 0.95) 100%);
  pointer-events: none;
}

/* GLASSMORPHIC NAVBAR */
.glass-nav, .glass-header {
  background: rgba(18, 20, 20, 0.65);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  transition: padding 0.3s ease, background 0.3s ease;
}

.glass-nav.scrolled, .glass-header.scrolled {
  background: rgba(18, 20, 20, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(247, 147, 26, 0.25);
}

/* MINIMAL FLOATING SCRUBBER */
.minimal-hud {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 40;
  display: flex;
  align-items: center;
  gap: 16px;
  background: rgba(18, 20, 20, 0.75);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(247, 147, 26, 0.3);
  border-radius: 9999px;
  padding: 10px 24px;
  box-shadow: 0 10px 35px rgba(0, 0, 0, 0.7), 0 0 20px rgba(247, 147, 26, 0.15);
  transition: opacity 0.4s ease;
}

.hud-scrubber-track-bg {
  width: 200px;
  height: 4px;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 2px;
  overflow: hidden;
  position: relative;
}

.hud-scrubber-track-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #ffb874, #f7931a);
  border-radius: 2px;
  transition: width 0.1s linear;
}

.hud-frame-display {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: rgba(226, 226, 226, 0.6);
  letter-spacing: 0.05em;
}

.hud-frame-display span {
  color: var(--accent-gold-bright);
  font-weight: 700;
}

/* ALTERNATING BLOG CARDS STYLING (PHASE 3) */
.blog-card-alternating {
  display: grid;
  grid-template-cols: 1fr;
  gap: 2rem;
  align-items: center;
  background-color: rgba(30, 32, 32, 0.5);
  border: 1px solid rgba(85, 67, 53, 0.3);
  border-radius: 1.25rem;
  padding: 1.5rem;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

@media (min-width: 768px) {
  .blog-card-alternating {
    grid-template-columns: repeat(12, 1fr);
    padding: 2rem;
  }

  .blog-card-alternating:nth-child(odd) .blog-card-img-col {
    grid-column: span 6 / span 6;
    order: 1;
  }
  .blog-card-alternating:nth-child(odd) .blog-card-text-col {
    grid-column: span 6 / span 6;
    order: 2;
  }

  .blog-card-alternating:nth-child(even) .blog-card-img-col {
    grid-column: span 6 / span 6;
    order: 2;
  }
  .blog-card-alternating:nth-child(even) .blog-card-text-col {
    grid-column: span 6 / span 6;
    order: 1;
  }
}

.blog-card-alternating:hover {
  border-color: rgba(255, 184, 116, 0.5);
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4), 0 0 30px rgba(247, 147, 26, 0.08);
}

.blog-card-img-wrapper {
  overflow: hidden;
  border-radius: 0.875rem;
  aspect-ratio: 16 / 10;
  position: relative;
  background-color: var(--bg-surface-high);
}

.blog-card-img-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.blog-card-alternating:hover .blog-card-img-wrapper img {
  transform: scale(1.06);
}

/* Redesigned Premium Blog Category Selector Buttons */
.cat-pill-active {
  background: linear-gradient(135deg, #ffb874 0%, #f7931a 100%);
  color: #0c0f0f;
  font-weight: 800;
  border: 1px solid rgba(255, 184, 116, 0.9);
  box-shadow: 0 10px 30px rgba(247, 147, 26, 0.35), 0 0 20px rgba(255, 184, 116, 0.2);
  transform: translateY(-2px);
}

.cat-pill-inactive {
  background: rgba(30, 32, 32, 0.75);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  color: #dbc2ae;
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

.cat-pill-inactive:hover {
  background: rgba(45, 48, 49, 0.95);
  border-color: rgba(255, 184, 116, 0.6);
  color: #ffffff;
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.5), 0 0 20px rgba(247, 147, 26, 0.15);
}

/* Article Drop Cap */
.drop-cap::first-letter {
  font-size: 3.5rem;
  font-family: var(--font-display);
  float: left;
  line-height: 1;
  margin-right: 0.75rem;
  margin-top: 0.25rem;
  color: var(--accent-gold-bright);
}

/* Animations */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

.animate-fadeInUp {
  animation: fadeInUp 0.8s ease forwards;
}

/* Subtle Side Quotes Scroll Transition */
.side-scroll-quote {
  transition: opacity 0.15s ease-out, transform 0.15s ease-out, visibility 0.15s ease-out;
  will-change: opacity, transform;
}