/* ── Scroll reveal animations ── */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* stagger children */
.reveal-stagger > .reveal:nth-child(1) { transition-delay: 0s; }
.reveal-stagger > .reveal:nth-child(2) { transition-delay: 0.06s; }
.reveal-stagger > .reveal:nth-child(3) { transition-delay: 0.12s; }
.reveal-stagger > .reveal:nth-child(4) { transition-delay: 0.18s; }
.reveal-stagger > .reveal:nth-child(5) { transition-delay: 0.24s; }
.reveal-stagger > .reveal:nth-child(6) { transition-delay: 0.3s; }
.reveal-stagger > .reveal:nth-child(7) { transition-delay: 0.36s; }
.reveal-stagger > .reveal:nth-child(8) { transition-delay: 0.42s; }

/* ── Cursor glow (desktop only) ── */
.cursor-glow {
  position: fixed;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
  background: radial-gradient(circle, var(--accent) 0%, transparent 70%);
  opacity: 0.03;
  transform: translate(-50%, -50%);
  transition: opacity 0.3s;
}

@media (max-width: 600px) {
  .cursor-glow { display: none; }
}

/* ── Hero gradient text ── */
.hero h1 .gradient-text {
  background: linear-gradient(135deg, var(--accent) 0%, #a855f7 50%, var(--accent) 100%);
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradient-shift 4s ease infinite;
}

@keyframes gradient-shift {
  0%, 100% { background-position: 0% center; }
  50% { background-position: 100% center; }
}

/* ── Post item hover ── */
.post-item {
  position: relative;
  transition: padding-left 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.post-item::before {
  content: "";
  position: absolute;
  left: -16px;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 0;
  background: var(--accent);
  border-radius: 2px;
  transition: height 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.post-item:hover {
  padding-left: 6px;
}

.post-item:hover::before {
  height: 60%;
}

/* ── Tag micro-interaction ── */
.tag {
  position: relative;
  overflow: hidden;
}

.tag::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: -1;
  border-radius: var(--radius);
}

.tag:hover::after {
  transform: scaleX(1);
}

/* ── Section title underline animation ── */
.section-title {
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), #a855f7);
  border-radius: 1px;
  transition: width 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.section-title.animated::after {
  width: 40px;
}

/* ── Article body h2 hover line ── */
.article-body h2 {
  position: relative;
  padding-left: 0;
  transition: padding-left 0.3s ease;
}

.article-body h2::before {
  content: "";
  position: absolute;
  left: -12px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--accent), #a855f7);
  border-radius: 2px;
  opacity: 0;
  transition: opacity 0.3s ease, left 0.3s ease;
}

.article-body h2:hover::before {
  opacity: 1;
  left: -8px;
}

/* ── Back link arrow animation ── */
.back-link {
  transition: padding-left 0.3s cubic-bezier(0.16, 1, 0.3, 1), color 0.2s;
}

.back-link:hover {
  padding-left: 4px;
}

/* ── Smooth header hide on scroll ── */
.site-header {
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1),
              background-color 0.3s, border-color 0.3s;
}

.site-header.hidden {
  transform: translateY(-100%);
}

/* ── Page load fade in ── */
body {
  animation: page-enter 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes page-enter {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ── Linktree card shine effect ── */
.linktree-link {
  position: relative;
  overflow: hidden;
}

.linktree-link::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 50%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.04), transparent);
  transition: none;
}

.linktree-link:hover::before {
  animation: shine 0.6s ease;
}

@keyframes shine {
  from { left: -100%; }
  to { left: 200%; }
}

/* ── Friend card subtle lift ── */
.friend-card {
  transition: border-color 0.2s, transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s;
}

.friend-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

[data-theme="dark"] .friend-card:hover {
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}