/* ============================================================
   ANIMATIONS — Keyframes, scroll-reveal, transitions
   ============================================================ */

/* ── Scroll Reveal ───────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
}

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

.reveal--scale {
  opacity: 0;
  transform: scale(0.92) translateY(16px);
}

.reveal--scale.revealed {
  opacity: 1;
  transform: scale(1) translateY(0);
}

/* Stagger delays */
.reveal--delay-1 { transition-delay: 60ms; }
.reveal--delay-2 { transition-delay: 120ms; }
.reveal--delay-3 { transition-delay: 180ms; }
.reveal--delay-4 { transition-delay: 240ms; }
.reveal--delay-5 { transition-delay: 300ms; }
.reveal--delay-6 { transition-delay: 360ms; }

/* ── Background Stream ────────────────────────────────────── */
.bg-stream-container {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 0;
}

.bg-stream-lane {
  position: absolute;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 13px;
  color: rgba(99,102,241,.12);
  animation: streamScroll var(--stream-dur, 30s) linear infinite;
  will-change: transform;
}

.bg-stream-lane:nth-child(2) { animation-delay: -8s;  animation-duration: 36s; color: rgba(139,92,246,.08); }
.bg-stream-lane:nth-child(3) { animation-delay: -16s; animation-duration: 28s; color: rgba(16,185,129,.07); }
.bg-stream-lane:nth-child(4) { animation-delay: -4s;  animation-duration: 40s; color: rgba(6,182,212,.06); }
.bg-stream-lane:nth-child(5) { animation-delay: -20s; animation-duration: 32s; color: rgba(249,115,22,.06); }

@keyframes streamScroll {
  from { transform: translateX(100vw); }
  to   { transform: translateX(-200%); }
}

/* ── Floating particles ──────────────────────────────────── */
.particle {
  position: absolute;
  border-radius: var(--radius-full);
  pointer-events: none;
  animation: particleFloat linear infinite;
  will-change: transform, opacity;
}

@keyframes particleFloat {
  0%   { transform: translateY(0) rotate(0deg);    opacity: 0; }
  10%  { opacity: 1; }
  90%  { opacity: 1; }
  100% { transform: translateY(-120vh) rotate(360deg); opacity: 0; }
}

/* ── Skeleton / Loading ───────────────────────────────────── */
.skeleton {
  background: linear-gradient(90deg,
    var(--bg-surface) 25%,
    var(--border-color) 50%,
    var(--bg-surface) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-md);
}

@keyframes shimmer {
  0%   { background-position: 200% center; }
  100% { background-position: -200% center; }
}

.skeleton-text  { height: 1em; margin-bottom: var(--space-2); }
.skeleton-title { height: 2em; margin-bottom: var(--space-4); width: 60%; }
.skeleton-para  { height: 4em; }

/* ── Pulse ────────────────────────────────────────────────── */
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .5; } }
.animate-pulse { animation: pulse 2s cubic-bezier(0.4,0,0.6,1) infinite; }

/* ── Spin ─────────────────────────────────────────────────── */
@keyframes spin { to { transform: rotate(360deg); } }
.animate-spin { animation: spin 1s linear infinite; }

/* ── Bounce ───────────────────────────────────────────────── */
@keyframes bounce {
  0%, 100% { transform: translateY(-10%); animation-timing-function: cubic-bezier(0.8,0,1,1); }
  50%       { transform: translateY(0);   animation-timing-function: cubic-bezier(0,0,0.2,1); }
}
.animate-bounce { animation: bounce 1s infinite; }

/* ── Page Transition ─────────────────────────────────────── */
.page-enter {
  animation: pageEnter var(--dur-normal) var(--ease-out) forwards;
}

@keyframes pageEnter {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Modal ────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.6);
  backdrop-filter: blur(4px);
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  animation: fadeIn var(--dur-fast) var(--ease-smooth);
}

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.modal {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  max-width: 680px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: var(--shadow-2xl);
  animation: modalSlideUp var(--dur-normal) var(--ease-spring);
  position: relative;
}

@keyframes modalSlideUp {
  from { opacity: 0; transform: translateY(24px) scale(0.96); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 1.2rem;
  transition: all var(--dur-fast);
}

.modal-close:hover { color: var(--text-primary); background: var(--border-color); }

/* ── Tooltip ─────────────────────────────────────────────── */
[data-tooltip] {
  position: relative;
}

[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--neutral-800);
  color: var(--text-inverse);
  font-size: var(--text-xs);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--dur-fast);
  z-index: var(--z-toast);
}

[data-tooltip]:hover::after { opacity: 1; }

/* ── Theme Toggle ─────────────────────────────────────────── */
.theme-toggle {
  position: relative;
  width: 44px;
  height: 24px;
  background: var(--border-color);
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  transition: background var(--dur-normal) var(--ease-smooth);
  flex-shrink: 0;
}

.theme-toggle::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  background: white;
  border-radius: var(--radius-full);
  transition: transform var(--dur-normal) var(--ease-spring);
  box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .theme-toggle { background: var(--brand-primary); }
[data-theme="dark"] .theme-toggle::after { transform: translateX(20px); }

/* ── Toast notifications ─────────────────────────────────── */
.toast-container {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  pointer-events: none;
}

.toast {
  background: var(--neutral-800);
  color: var(--text-inverse);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  box-shadow: var(--shadow-xl);
  animation: toastSlideIn var(--dur-normal) var(--ease-spring);
  pointer-events: all;
  border-left: 4px solid var(--color-success);
}

@keyframes toastSlideIn {
  from { opacity: 0; transform: translateX(24px); }
  to   { opacity: 1; transform: translateX(0); }
}

/* counter animation */
@keyframes countUp {
  from { transform: translateY(10px); opacity: 0; }
  to   { transform: translateY(0); opacity: 1; }
}

.count-animated { animation: countUp var(--dur-slow) var(--ease-out) forwards; }