@keyframes ink-spread {
  0% {
    opacity: 0;
    filter: blur(20px) contrast(120%); 
    letter-spacing: 0.1em; 
    transform: scale(0.95);
  }
  100% {
    opacity: 1;
    filter: blur(0) contrast(100%);    /* 最终清晰 */
    letter-spacing: 0.25em; 
    transform: scale(1);
  }
}

/* 按钮入场动效 */
@keyframes cta-rise {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --- 浮动呼吸感（可选：让标题出现后轻微晃动） --- */
@keyframes title-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-5px); }
}

@keyframes cloud-drift {
  0%   { transform: translateX(-10%) translateY(0); opacity: 0.3; }
  50%  { transform: translateX(5%) translateY(-10px); opacity: 0.6; }
  100% { transform: translateX(-10%) translateY(0); opacity: 0.3; }
}

@keyframes cloud-waft {
  0%   { filter: blur(2px); }
  50%  { filter: blur(5px); }
  100% { filter: blur(2px); }
}