/* =====================================================
   components.css
   Reusable UI pieces: nav, buttons, cards, tags, badges.
   ===================================================== */

/* ---------- NAV ---------- */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  background: rgba(245, 243, 239, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
}
.nav-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  width: 100%;
  padding: 0 var(--container-pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-family: var(--font-serif);
  font-size: 17px;
  color: var(--text);
}
.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
  min-width: 0;
  flex-wrap: wrap;
  justify-content: flex-end;
}
.nav-links a {
  font-size: 13.5px;
  font-weight: 500;
  color: var(--muted);
  transition: color var(--transition-base);
}
.nav-links a:hover { color: var(--text); }
.nav-links a[aria-current="true"] {
  color: var(--accent);
  position: relative;
}
.nav-links a[aria-current="true"]::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -6px;
  height: 1px;
  background: var(--accent);
}

/* Scroll progress bar (top of page) */
.scroll-progress {
  position: fixed;
  top: 0; left: 0;
  height: 2px;
  width: 0;
  background: var(--accent);
  z-index: 101;
  transition: width 0.05s linear;
}

/* ---------- BUTTONS ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-sans);
  font-size: 13.5px;
  font-weight: 500;
  padding: 9px 18px;
  border-radius: 6px;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-base);
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: var(--accent-dk); }
.btn-outline {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}
.btn-outline:hover {
  border-color: var(--text);
  background: var(--surface);
}

/* ---------- TAGS / CHIPS ---------- */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}
.tag,
.stack-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 4px 10px;
  background: var(--tag-bg);
  color: var(--code);
  border-radius: 4px;
  border: 1px solid var(--border);
  display: inline-block;
}
.tag.hi {
  background: var(--tag-hi-bg);
  color: var(--tag-hi-fg);
  border-color: var(--tag-hi-border);
}
.stack-tag {
  font-size: 11.5px;
  padding: 3px 9px;
}

/* ---------- BACK TO TOP ---------- */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  border: none;
  font-size: 18px;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity 0.2s, transform 0.2s, background 0.15s;
  z-index: 90;
  display: flex;
  align-items: center;
  justify-content: center;
}
.back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: none;
}
.back-to-top:hover { background: var(--accent-dk); }

/* ---------- LOADING SHIM ---------- */
.app-loader {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  transition: opacity 0.3s ease;
}
.app-loader.is-hidden {
  opacity: 0;
  pointer-events: none;
}
.app-loader__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 1s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { transform: scale(0.6); opacity: 0.4; }
  50%      { transform: scale(1);   opacity: 1; }
}

/* ---------- FADE IN ---------- */
.fade {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--transition-slow) ease,
              transform var(--transition-slow) ease;
}
.fade.is-visible {
  opacity: 1;
  transform: none;
}