/* ============================================================
   ANIMATIONS.CSS — 全站动效系统
   北京云杉慈善基金会
   ============================================================ */

/* ── 基础进场动画 ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(32px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes fadeLeft {
  from { opacity: 0; transform: translateX(-28px); }
  to   { opacity: 1; transform: translateX(0); }
}
@keyframes fadeRight {
  from { opacity: 0; transform: translateX(28px); }
  to   { opacity: 1; transform: translateX(0); }
}
@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.92); }
  to   { opacity: 1; transform: scale(1); }
}
@keyframes slideDown {
  from { opacity: 0; transform: translateY(-20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── 持续动画 ── */
@keyframes floatY {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-12px); }
}
@keyframes pulse-ring {
  0%   { transform: scale(1);   opacity: 0.6; }
  100% { transform: scale(1.6); opacity: 0; }
}
@keyframes shimmer {
  0%   { background-position: -400px 0; }
  100% { background-position: 400px 0; }
}
@keyframes rotateSlow {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}
@keyframes drawLine {
  from { stroke-dashoffset: 1000; }
  to   { stroke-dashoffset: 0; }
}
@keyframes countUp {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes particleDrift {
  0%   { transform: translateY(0)    translateX(0)    opacity(0.6); }
  33%  { transform: translateY(-30px) translateX(15px); }
  66%  { transform: translateY(-60px) translateX(-10px); }
  100% { transform: translateY(-90px) translateX(5px); opacity: 0; }
}
@keyframes borderGlow {
  0%, 100% { box-shadow: 0 0 0 0 rgba(24,120,58,0.4); }
  50%       { box-shadow: 0 0 0 8px rgba(24,120,58,0); }
}
@keyframes gradientShift {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}
@keyframes leafSway {
  0%,100% { transform: rotate(-3deg); }
  50%     { transform: rotate(3deg); }
}
@keyframes numberRoll {
  from { transform: translateY(100%); opacity: 0; }
  to   { transform: translateY(0);    opacity: 1; }
}

/* ── Scroll-reveal 系统 ── */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}
.reveal.from-left  { transform: translateX(-30px); }
.reveal.from-right { transform: translateX(30px); }
.reveal.scale      { transform: scale(0.93); }
.reveal.visible {
  opacity: 1;
  transform: none;
}
/* 交错延迟 */
.reveal-stagger > *        { opacity: 0; transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.22,1,0.36,1), transform 0.6s cubic-bezier(0.22,1,0.36,1); }
.reveal-stagger.visible > *:nth-child(1) { opacity:1;transform:none;transition-delay:0.0s; }
.reveal-stagger.visible > *:nth-child(2) { opacity:1;transform:none;transition-delay:0.1s; }
.reveal-stagger.visible > *:nth-child(3) { opacity:1;transform:none;transition-delay:0.2s; }
.reveal-stagger.visible > *:nth-child(4) { opacity:1;transform:none;transition-delay:0.3s; }
.reveal-stagger.visible > *:nth-child(5) { opacity:1;transform:none;transition-delay:0.4s; }
.reveal-stagger.visible > *:nth-child(6) { opacity:1;transform:none;transition-delay:0.5s; }
.reveal-stagger.visible > *:nth-child(7) { opacity:1;transform:none;transition-delay:0.6s; }

/* ── 微交互 ── */
.hover-lift {
  transition: transform 0.25s cubic-bezier(0.34,1.56,0.64,1),
              box-shadow 0.25s ease;
}
.hover-lift:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 40px rgba(0,0,0,0.14);
}
.hover-scale {
  transition: transform 0.2s ease;
}
.hover-scale:hover { transform: scale(1.04); }

/* ── 数字计数器 ── */
.stat-number {
  display: inline-block;
  animation: countUp 0.8s cubic-bezier(0.22,1,0.36,1) both;
}

/* ── 进度条 ── */
.progress-bar-fill {
  height: 3px;
  background: linear-gradient(90deg, #18783a, #45b984);
  transform-origin: left;
  transform: scaleX(0);
  transition: transform 1.2s cubic-bezier(0.22,1,0.36,1);
  border-radius: 2px;
}
.progress-bar-fill.animated { transform: scaleX(1); }

/* ── 粒子背景容器 ── */
.particle-canvas {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

/* ── 打字机效果 ── */
.typewriter {
  overflow: hidden;
  border-right: 2px solid rgba(255,255,255,0.7);
  white-space: nowrap;
  animation: typing 2.5s steps(14,end) forwards,
             blink-caret 0.6s step-end infinite;
  width: 0;
}
@keyframes typing      { to { width: 100%; } }
@keyframes blink-caret { 50% { border-color: transparent; } }

/* ── 线条装饰动画 ── */
.anim-line {
  height: 2px;
  background: linear-gradient(90deg, transparent, #18783a, transparent);
  transform: scaleX(0);
  transition: transform 1s ease;
}
.anim-line.visible { transform: scaleX(1); }

/* ── 卡片悬停光晕 ── */
.card-glow {
  position: relative;
  overflow: hidden;
}
.card-glow::after {
  content: '';
  position: absolute;
  inset: -50%;
  background: radial-gradient(circle at var(--mx,50%) var(--my,50%),
              rgba(24,120,58,0.12) 0%, transparent 60%);
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}
.card-glow:hover::after { opacity: 1; }