/* GB/DEV Unity Blog - Shared Styles */

:root {
  --bg: #141c2c;
  --bg2: #1a2438;
  --bg3: #202c44;
  --panel: #263450;
  --border: rgba(56, 192, 240, 0.22);
  --accent: #38c0f0;
  --accent2: #7050f0;
  --accent3: #60d0ff;
  --text: #e4f2ff;
  --muted: #6888b0;
  --dim: #2e3c54;

  /* --- polish tokens (theme-independent) --- */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);     /* smooth ease-out for reveals */
  --ease-soft: cubic-bezier(0.4, 0, 0.2, 1);  /* gentle ease for hovers */
  --t-fast: 0.2s;
  --t-med: 0.4s;
  --glow-accent: color-mix(in srgb, var(--accent) 38%, transparent);
  --glow-soft: color-mix(in srgb, var(--accent) 16%, transparent);
  --ring: color-mix(in srgb, var(--accent) 45%, transparent);
  --hairline: color-mix(in srgb, var(--accent) 14%, transparent);
  --r-card: 16px;
  --r-img: 11px;
  --r-sm: 10px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 64px; /* Account for fixed navbar */
  background: var(--bg);
}

/* SKIP LINK (Accessibility) */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--accent);
  color: #000;
  padding: 8px 16px;
  text-decoration: none;
  font-family: 'Rajdhani', sans-serif;
  font-weight: 600;
  font-size: 14px;
  z-index: 1000;
  transition: top 0.2s;
}

.skip-link:focus {
  top: 0;
}

/* KEYBOARD FOCUS INDICATORS (Accessibility) */
a:focus-visible,
button:focus-visible,
.theme-option:focus-visible,
.hamburger:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', sans-serif;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
}

/* PAGE CONTAINER - Centers content on large screens */
.page-container {
  max-width: 1400px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}



/* Ambient glow blobs */
.bg-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  z-index: 0;
}
.bg-glow.g1 {
  width: 600px; height: 600px;
  top: -200px; left: -200px;
  background: radial-gradient(circle, rgba(160,80,255,0.05) 0%, rgba(160,80,255,0.02) 40%, transparent 70%);
}
.bg-glow.g2 {
  width: 500px; height: 500px;
  bottom: 100px; right: -100px;
  background: radial-gradient(circle, rgba(224,64,251,0.04) 0%, rgba(224,64,251,0.01) 40%, transparent 70%);
}

/* NAV */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 48px;
  height: 64px;
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  backdrop-filter: blur(22px) saturate(1.3);
  -webkit-backdrop-filter: blur(22px) saturate(1.3);
  border-bottom: 1px solid var(--hairline);
  transition: background var(--t-med) var(--ease-soft), border-color var(--t-med) var(--ease-soft);
}

/* solidifies once the page is scrolled (set by scroll-spy/reveal) */
nav.nav-scrolled {
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  border-bottom-color: var(--border);
  box-shadow: 0 1px 0 0 var(--hairline), 0 18px 40px -28px rgba(0,0,0,0.9);
}

.nav-logo {
  font-family: 'Share Tech Mono', monospace;
  font-size: 14px;
  color: var(--accent);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  transition: text-shadow var(--t-med) var(--ease-soft);
}

nav:hover .nav-logo {
  text-shadow: 0 0 14px var(--glow-accent);
}

.nav-logo span {
  color: var(--muted);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
  list-style: none;
}

.nav-links a {
  font-family: 'Rajdhani', sans-serif;
  font-weight: 500;
  font-size: 13px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s;
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.nav-links a svg { flex-shrink: 0; }

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0; right: 0;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform 0.2s;
  transform-origin: left;
}

.nav-links a {
  transition: color var(--t-fast) var(--ease-soft);
}

.nav-links a::after {
  transition: transform var(--t-med) var(--ease);
}

.nav-links a:hover { color: var(--accent); }
.nav-links a:hover::after { transform: scaleX(1); }

.nav-links a.nav-active {
  color: var(--accent);
  text-shadow: 0 0 8px var(--accent);
}
.nav-links a.nav-active::after { transform: scaleX(1); }

/* MOBILE NAV - Hamburger Menu */
.hamburger {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 101;
}

.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--accent);
  transition: all 0.3s ease;
  display: block;
}

.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(7px, 7px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(7px, -7px); }

/* BUTTONS */
.btn {
  font-family: 'Rajdhani', sans-serif;
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 13px 30px;
  text-decoration: none;
  transition: transform var(--t-fast) var(--ease-soft), box-shadow var(--t-med) var(--ease-soft), background var(--t-fast) var(--ease-soft), color var(--t-fast) var(--ease-soft);
  cursor: pointer;
  border: none;
  display: inline-block;
}

.btn-primary {
  background: var(--accent);
  color: #000;
  border-radius: var(--r-sm);
  box-shadow: 0 6px 24px -10px var(--glow-accent);
}

.btn-primary:hover {
  background: var(--text);
  transform: translateY(-2px);
  box-shadow: 0 14px 36px -10px var(--glow-accent);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  transition: transform var(--t-fast) var(--ease-soft), border-color var(--t-fast) var(--ease-soft), color var(--t-fast) var(--ease-soft);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

/* FOOTER */
footer {
  position: relative;
  z-index: 1;
  padding: 40px 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border);
}

.footer-copy {
  font-family: 'Share Tech Mono', monospace;
  font-size: 11px;
  color: var(--muted);
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-family: 'Rajdhani', sans-serif;
  font-weight: 500;
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-links a:hover { color: var(--accent); }

.footer-rss { display: flex; align-items: center; gap: 5px; }

.nav-rss { display: flex; align-items: center; }
.nav-rss::after { display: none; }

/* THEME SWITCHER */
.theme-switcher {
  position: relative;
}

.theme-toggle-btn {
  display: flex;
  align-items: center;
  gap: 7px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  font-family: 'Rajdhani', sans-serif;
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 7px 14px;
  cursor: pointer;
  transition: all 0.2s;
  border-radius: 9px;
}

.theme-toggle-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.theme-icon {
  font-size: 15px;
  line-height: 1;
}

.theme-panel {
  display: none;
  position: absolute;
  top: calc(100% + 12px);
  right: 0;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  min-width: 200px;
  max-height: 360px;
  overflow-y: auto;
  z-index: 200;
  box-shadow: 0 20px 60px rgba(0,0,0,0.6);
}

.theme-panel.open {
  display: block;
  animation: fadeDown 0.15s ease;
}

.theme-panel-title {
  font-family: 'Share Tech Mono', monospace;
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 0.2em;
  margin-bottom: 12px;
}

.theme-option {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 9px;
  padding: 8px 10px;
  cursor: pointer;
  font-family: 'Rajdhani', sans-serif;
  font-weight: 500;
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--muted);
  text-align: left;
  transition: all 0.15s;
  margin-bottom: 4px;
}

.theme-option:hover, .theme-option.active {
  color: var(--text);
  border-color: var(--border);
  background: var(--panel);
}

.theme-option.active {
  color: var(--accent);
  border-color: var(--accent);
}

.theme-swatch {
  width: 16px;
  height: 16px;
  border-radius: 2px;
  flex-shrink: 0;
}

/* ANIMATIONS */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeDown {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes blink {
  50% { opacity: 0; }
}

@keyframes slide {
  to { left: 100%; }
}

/* READING PROGRESS INDICATOR */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: rgba(0, 0, 0, 0.3);
  z-index: 200; /* Above nav (z-index: 100) */
  opacity: 0;
  transition: opacity 0.3s ease;
}

.reading-progress.visible {
  opacity: 1;
}

.reading-progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent2) 100%);
  transition: width 0.1s ease-out;
  box-shadow: 0 0 8px var(--accent);
}

/* RESPONSIVE */
@media (max-width: 768px) {
  nav { padding: 0 16px; }

  .nav-logo { font-size: 12px; letter-spacing: 0.05em; }

  .theme-label { display: none; }

  .hamburger { display: flex; }

  .nav-links {
    position: fixed;
    top: 64px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 64px);
    background: rgba(10,10,14,0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding-top: 48px;
    gap: 32px;
    transition: left 0.3s ease;
    border-right: 1px solid var(--border);
  }

  .nav-links.active { left: 0; }
  .nav-links a { font-size: 18px; }

  footer { flex-direction: column; gap: 16px; align-items: flex-start; padding: 32px 24px; }
}